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|Image request: In the image showing the fuel reformer, polymer electrolyte fuel cell stack, inverter, heat recovery device, hot water storage tank, backup heat sourceImage providedplease.(2011/3）|
ENE-FARM Is for home useFuel cellCogenerationIt is a nickname for the system.2008May 6(FCCJ) has decided on a unified name regardless of the company, etc., as an initiative to promote awareness of household fuel cells.
ENE-FARM is a household fuel cell that produces electricity at home and also produces hot water at the same time. It was named by combining "energy" and "farm = farm".
Also, as a symbol mark, "a tree that expresses new energy that brings a lot of fruit to the earth" is adopted.The nuts express various values such as "electricity", "hot water", "comfort", "environment", "advanced", and "future" brought about by household fuel cells.CO from home2We aim to contribute to emission reductions and spread as a pillar of the energy system of the future low-carbon society.
City Gas-LP gasTherefore, it becomes fuel using a reformer.hydrogenTake out and in the airoxygenReact withPower generationThis system uses the exhaust heat from power generation for hot water supply.The heat generated at this time is used for hot water supply.Effective use of energy saves energy.In addition, because hydrogen is used during power generationcarbon dioxideHowever, carbon dioxide is emitted in the process of extracting hydrogen by reforming.
The output is 700W (Aisin, Pansonic), 400W (Kyocera).Polymer electrolyte fuel cell(PEFC) andSolid oxide fuel cellThere are two types (SOFC) (at Chofu Seisakusho, etc.)SOFC typeIs called "ENE-FARM type S").
Since it has a function to generate electricity even in the event of a power outage due to a disaster, etc., the resilience of ENE-FARM is highly evaluated due to the need for evacuation at home due to the corona disaster.
Advantages and disadvantages
- Since the exhaust heat generated by power generation can be used directly, the type that does not use the exhaust heatThermal power generation,Nuclear powerHigher energy utilization efficiency during power generation.CogenerationSee also.
- To generate electricity at homePower transmissionThere is almost no loss.
- Gas companySome have a dedicated rate menu where you can get a discount on gas rates.
- Electricity charges are reduced because the power generated during hot water supply can cover about 4-6% of the electricity used at home.
- Since it is used in combination with an auxiliary heat source machine, there is no need to worry about running out of hot water.
- There is a subsidy system.
- Power can be generated even during a power outage.
- Resilience is extremely high because it is possible to evacuate from home in the event of a disaster in the corona.
- Since the state of power generation can be checked on the screen of the monitor or remote control, awareness of electricity will increase, leading to energy saving.
- It is a system that can make full use of energy because hot water is created and used for hot water supply without discarding the heat generated during power generation.
- If you have a power sale contract, the surplus power can be sold to the gas company (SOFC machine).
- Since it is a system that heats the hot water in the hot water storage tank with the exhaust heat during power generation, a space for installing the hot water storage tank is required.If it is small, it requires as much space as the outdoor unit of an air conditioner..
- gasWater heaterCompared to, although there is a subsidy system, the initial cost is high. Around 1 million yen per aircraft (the former is 100 yen or less).
- The PEFC machine stops power generation when the hot water in the hot water storage tank is boiled, so the amount of power generated depends on the amount of hot water used.
- For a long timeLow frequency soundIt has been reported that there is a problem with the neighboring residents, and it is necessary to give special consideration to the neighborhood when considering the installation location. (See below)
- Since there is no loss from the power plant, it is more efficient than thermal power generation, but its thermal efficiency is lower than that of EcoCute.When reforming from gas to hydrogencarbon dioxideAnd NOx are discharged.
- The liberalization of electricity from April 2016 has made it possible to sell surplus electricity, but the purchase price is not fixed for 4 years like solar power generation.
How it works
ENE-FARM is roughly divided into the following six devices. :
- Fuel (city gas, LP gas)Steam reformingAnd get hydrogen gas
- Polymer electrolyte fuel cell stack
- Hydrogen from the reformer reacts with oxygen in the air to generate DC power (heat is also generated at the same time).
- DCからAlternating currentConversion to,Grid interconnectionControls various functions related to
- Heat recovery device
- Recovers heat from the reformer and fuel cell stack to make hot water
- Hot water storage tank
- Store hot water
- Backup heat source
- Supply hot water when the hot water in the hot water tank becomes insufficient
This gives both power and heat.70-80% of the energy of fuel can be used.
Movement of spread
- March 2001 Established Fuel Cell Practical Use Promotion Council (FCCJ).Established for the purpose of popularizing and commercializing fuel cells in Japan by solving problems and making policy proposals for the practical use and popularization of fuel cells in Japan.
- December 2008 Established Fuel Cell Promotion Association (FCA).Fuel cell-related industries, etc. will work together to promote the spread of fuel cells and CO2Established with the aim of contributing to the reduction of environmental burden in Japan by contributing to the reduction of environmental burden.
- A monitor test was conducted in 2008.In this caseLifuel Called.
- January 2009 Implemented a joint declaration of "To Japan, an environmentally-friendly country with ENE-FARM" to popularize the household fuel cell "ENE-FARM".Six companies, Astomos Energy Corporation, ENEOS Corporation, Osaka Gas Corporation, Saibu Gas Corporation, Tokyo Gas Corporation, and Toho Gas Corporation, participated.
- Sales started in 2009 under the name of ENE-FARM..At a house maker, etc.Solar powerThere are also examples of being adopted as a set with.
- The subsidy system for introducing consumer fuel cells has started, and acceptance will start from May 2009, 5...The maximum amount of subsidy at the start of the system is 140 million yen, but it is decreasing year by year.[Source required]..This system will continue to be implemented until 2020.
- Tokyo Gas,Toho GasAnd so onPanasonicFrom againOsaka GasAnd so onToshiba Fuel Cell System,ENEOSProducts are supplied by Celtec (both)Chofu ManufacturingfromOEM).
- In September 2011, the "FC Support Network" was established within the Cogeneration Foundation as a secretariat to promote the nationwide spread of ENE-FARM, and spread nationwide with the support of businesses and manufacturers that are promoting the introduction of ENE-FARM. Promote promotion activities.
- October 2011, JX Nippon Oil & Energy (currentlyENEOS) Launched the world's first SOFC-type ENE-FARM as a commercial machine (with Chofu)Dainichi Industry(Co-developed product with).
- In July 2012, Osaka Gas released ENE-FARM with a self-sustaining operation function, which was jointly developed with Toshiba Fuel Cell Power Systems and Chofu Seisakusho.
- From April 2013, Tokyo Gas will release a new product of ENE-FARM jointly developed with Panasonic..
- Established ENE-FARM Partners in May 2013.ENE-FARM related industries and organizations come together to save energy and CO in housing2Established to promote reduction.
Tokyo GasSo, I'm using the catch phrase "From a house that uses energy to a house that makes it."..In reality, it does not produce energy from nothing, but an energy conversion that produces electricity and heat from chemical energy.
Low frequency noise problem
Many household cogeneration systems and heat pump water heaters, not limited to ENE-FARM, generate low-frequency noise because they drive fans during operation. In December 2017, the Consumer Affairs Agency's Accident Investigation Committee reported that the relationship between driving noise emitted by ENE-FARM and health hazards was pointed out.The main health hazards are headache, insomnia, and chest tightness.There were reports that individual differences in damage were large, and even in the bedroom 12 meters away from ENE-FARM, driving noise was transmitted and complained of insomnia.
The low-frequency sound itself is also generated from the outdoor unit of the air conditioner and the engine of the automobile, but in the case of ENE-FARM, the volume is louder than other sources, and due to its operating principle, it is generated for a long time and at night, which is a problem. It becomes.Since there are few structural restrictions on the installation location, it is possible that the property will be installed closer to the bedroom of the next house than the bedroom of the owner, and even if the next house complains of insomnia, the owner will not feel any damage and will be in trouble. May become.As mentioned above, since there are large individual differences in the onset, only one person complains of the damage, and there are cases where other family members and owners cannot hear or feel it, and it is difficult to understand the seriousness of the damage.
The solution is equipment relocation, ANC equipment, masking noise, soundproof enclosures.Is possible, and a certain effect may be seen.Osaka Gas has developed an ANC (Active Noise Control) device "Spot Silencer" for ENE-FARM in cooperation with Sasakura Engineering Co., Ltd.The cost is 70 yen, but as of February 2018, it is unknown whether it will have a definite effect because it has not been used.
- Aisin(Type S model fuel cell unit is Osaka GasToyotaas well as the KyoceraJoint development with)
- Chofu Manufacturing（アイシン・Toshiba Fuel Cell System-Osaka Gas-ENEOSForOEM）
- Purpose(Aisin [Tokyo Gas specification] and Kyocera's backup heat source machine)
The manufacturer that used to manufacture
- Toshiba Fuel Cell System
- ^ Energy Saving / Environmental | Home Energy | JX Nippon Oil & Energy
- ^ "About the release of "ENE-FARM Mini"”. Sankei Shimbun. 2020th of February 4Browse.
- ^ "Widespread use of household fuel cells (ENE-FARM)”. Ministry of Economy, Trade and Industry. 2020th of February 4Browse.
- ^ a b ENE-FARM subsidy up to 140 million yen, Kenplatz, April 2009, 4
- ^ About ENE-FARM
- ^ Recruitment of household fuel cell monitors by Tokyo Gas (2008)
- ^ Sekisui House Launches Environmentally Friendly Housing "Green First", Nikkei BP, March 2009, 3
- ^ About subsidy system
- ^ Expansion of lineup of household fuel cells "ENE-FARM"
- ^ 
- ^ ENE-FARM-From a house that uses energy to a house that makes it- Tokyo Gas
- ^ a b Cases in which symptoms such as insomnia were caused by driving noise generated from a home cogeneration system (Consumer Affairs Agency)
- ^ About review of household fuel cell business system
Fuel cell(Nenryo Denchi,British: fuel cell) IsElectrochemistryBy reactionfuel OfChemical energyからelectricityTake out (=Power generationDo)Power InputRefers to.fuelDepending on the method,hydrogen,hydrocarbon,alcoholAnd so on.
Fuel cells have some kind of refillable negative electrodeActive material(hydrogenFuels such as) and positive electrode active material空 気InoxygenEtc. can be continuously extracted by supplying and reacting in a normal temperature or high temperature environment.Power generatorIs.A fixed amount of active material with a limited capacitance in the device was usedPrimary battery,Secondary batteryCompared to the fuel cell, which can continue to replenish both the positive electrode material and the negative electrode material, the fuel cell is significantly different in that it can permanently discharge without limiting the electric capacity.
Heat engineUnlike a normal power generation system that usesChemical energyからElectric energyIn the process of conversion toHeat energy,Physical energySince it does not go through the form ofCarnot efficiencyPower generation efficiency is high because it does not depend onIn addition, it is not affected by the size of the system so much that there is little noise or vibration. for that reason,laptop,Mobile phoneFrom mobile devices such asAutomobile,Train, Consumer/industrialCogenerationPower plant,MilitaryIt is expected as an energy source that covers a variety of uses and scales, including weapons.
Focusing on the point that the positive electrode material and the negative electrode material are input from the outside of the fuel cellRedox flow batteryIs similar to. In the case of a fuel cell, generally, the positive electrode material (oxidant) is oxygen in the air, and the substance after the reaction is discharged as water vapor or carbon dioxide, which is used as a primary battery. On the other hand, in the case of a redox flow battery, both the positive electrode material and the negative electrode material are liquids, and the discharged liquid is returned to the tank without discharge of exhaust gas due to discharge. A reverse reaction can be caused by applying a reverse voltage to the battery, and it can be restored as a positive electrode material or a negative electrode material. As described above, the redox flow battery is mainly used as a secondary battery.
As a mechanism for reacting hydrogen and extracting electricity,Electrolysis2H which is the reverse reaction of2 + O2 → 2H2Often due to O. In addition to the heat generated during the reaction, the higher the power generation efficiency, the higher the reaction temperature tends to be, and some systems require an environment near 1,000°C. The substance produced by the reaction is water, but since it is produced in a high temperature environment, it is actually discharged.water vaporor温水.
Research and development is underway in each country,ElectrolyteThere are several methods depending on the type.
Four types of fuel cell systems are mainly studied depending on the type of electrolyte used. Alkaline electrolyte fuel cell (AFC) is a conventional method and is considered to have limited future use. Biofuel cells are quite different from other systems and there are many unclear points.
Polymer Electrolyte Fuel Cell (PEFC)
A polymer electrolyte fuel cell (PE(M)FC, Polymer Electrolyte (Membrane) Fuel Cell) supplies an oxidizing material to the positive electrode and a reducing material (fuel) to the negative electrode with an ion exchange membrane sandwiched between them. To generate electricity. As an ion exchange membraneNafionSuch asprotonWhen an exchange membrane is used, it is also called a proton exchange membrane fuel cell (PEMFC, Proton Exchange Membrane Fuel Cell). It starts up quickly and the operating temperature is as low as 80-100℃. When hydrogen is used as a fuel, expensive platinum is used as a catalyst, and the presence of carbon monoxide in the fuel deteriorates the platinum of the catalyst. Power generation efficiency is about 30-40%, which is relatively low among fuel cells.
The phosphoric acid type has been put into practical use next to the type, but since the power generation efficiency is low, it is expected to be used for power generation in a small size application.catalystUsed asplatinumFluorine-based used as electrolyteIon exchange resinThe improvement of durability and cost are issues to be popularized in the future.
Because it can be operated at room temperature and can be made smaller and lighter,Fuel cell carIt is expected to be applied to
Phosphoric acid fuel cell (PAFC)
Phosphoric acid fuel cells (PAFCs) are used as electrolytes.phosphoric acid(H3PO4) The aqueous solution is used by impregnating the separator. The operating temperature is about 200℃, and the power generation efficiency is about 40%LHV. Since platinum is used as a catalyst as in the polymer electrolyte fuel cell, the presence of carbon monoxide in the fuel deteriorates the catalyst platinum. Therefore,Natural gasWhen using such as fuel, it is necessary to make hydrogen with a carbon monoxide concentration of about 1% by steam reforming/carbon monoxide conversion reaction and supply it to the battery body.
A 100/200kW class package has been put on the market as an on-site type cogeneration system to be installed in demand equipment such as factories and buildings, and already has an operating life of 4 hours or more (without stack/reformer replacement) in commercial machines. Has achieved.[Note 1]
Molten carbonate fuel cell (MCFC)
Molten carbonate fuel cells (MCFC, Molten Carbonate Fuel Cell)+) Instead of carbonate (CO32-), the molten carbonate (Lithium carbonate,Potassium carbonateEtc.) as an electrolyte and impregnated into a separator for use. Therefore, it is not limited to hydrogenNatural gas,coalIt is possible to use gas as fuel. Operating temperature is about 600℃-700℃. Since carbonate that is solid at room temperature also melts near the operating temperature, it can be used as an electrolyte. As a competing option to PAFC, 250kW class packages are being introduced to the market. Power generation efficiency is about 45% LHV. Since no platinum catalyst is used, unlike PEFC and PAFC, there is no risk of poisoning by carbon monoxide, and it is also advantageous in using exhaust heat. The internal reforming method is used, but it seems that a reformer for pre-reforming is generally installed in the system.Thermal power plantIt is expected to be used as a substitute for.[Note 2]
In a normal combustion reaction, the upper limit of carbon dioxide concentration in exhaust gas is about 20% due to the presence of nitrogen in the air, and oxygen must be used instead of air to further increase the carbon dioxide concentration. However, in MCFC, carbon dioxide ions intervene in the cell reaction, and carbon dioxide and oxygen on the air electrode side selectively move and accumulate on the fuel electrode side, so the carbon dioxide concentration in the exhaust gas on the fuel electrode side reaches about 80%. Utilizing this property, it has been attempted to recover carbon dioxide by MCFC. In Japan as a Ministry of Economy, Trade and Industry subsidy projectChina Electric Power-Chubu Electric PowerJointly implemented.
Solid oxide fuel cell (SOFC)
A solid oxide fuel cell (SOFC) is also called a solid oxide fuel cell and requires an operating temperature of 700-1,000°C, so a highly heat-resistant material is required. It also has a long start/stop time. Stabilization with high permeability of oxide ions as electrolyteZirconia,lanthanum,gallium OfPerovskite oxideIonic conductivity such asCeramicsIs used for the oxide ion (O2-) Penetrates the electrolyte and reacts with hydrogen or carbon monoxide at the fuel electrode to generate electric energy. Therefore, not only hydrogenNatural gas,coalGases also require desulfurization treatment, but can be used as fuel by a simple steam reforming treatment (removal of carbon monoxide is not necessary and reforming contains some unreformed gas in the fuel). is there. Since the activation voltage drop is small, the power generation efficiency is high, and in some cases it has already achieved 56.1% LHV. It is also developed as a 1kW-10kW class for home and business use.[Note 3].. In principle, reforming in the power generation part (direct internal reforming in the fuel electrode containing nickel) is possible, but in order to prevent extreme temperature changes in the power generation part due to endothermic reaction, a pre-reformer (heat or reaction due to power generation reaction Indirect internal reforming that utilizes the heat of burning the latter fuel) is generally adopted.Polymer electrolyte fuel cellUsed in other fuel cells such asplatinum,palladiumEtc.Precious metalSystemcatalystHowever, a cermet made of nickel and electrolyte ceramics is used as the fuel electrode, and a conductive ceramic is used as the air electrode. Large SOFCs are expected to obtain extremely high overall power generation efficiency by utilizing combustion exhaust gas for gas turbine power generation and steam power generation, and are therefore expected to be used as substitutes for thermal power plants.[Note 4][Note 5]
NGKCo., Ltd. announced on June 2009, 6 that it has developed its own structure of SOFC and achieved the world's highest level of 11% power generation efficiency (LHV) and high fuel utilization rate of 63%.
Alkaline electrolyte fuel cell (AFC)
Alkaline electrolyte fuel cells (AFC, Alkaline Fuel Cell)Hydroxide ionAs an ion conductor,alkaliA cell is constructed by impregnating the separator between the electrodes with the electrolytic solution.PEFCSimilar to the above, a type using a polymer film has been reported. Since it has the simplest structure and is used in an alkaline atmosphere,nickelIt is a fuel cell that is highly reliable and can be put to practical use in space applications, because it is possible to use inexpensive electrode catalysts such as oxides, and the cell configuration can be simplified because a liquid electrolyte is used at room temperature. .. On the other hand, when hydrogen is taken out from the reformed hydrocarbon-based fuel, if hydrocarbon is mixed, the alkaline electrolyte will beCarbonateCause deterioration. Similarly, when air is used as an oxidant,carbon dioxideSince oxygen is absorbed and deteriorated, it is necessary to use highly pure oxygen as an oxidant. To increase the purity of hydrogen,palladiumPurity is increased by permeating through the membrane. Since the electrolyte is an aqueous solution, the operating temperature range is limited to a temperature at which the electrolyte does not freeze or evaporate. Further, the mobility of ions (diffusion coefficient) changes depending on the temperature and affects the power generation, so the temperature condition is severe. Nickel-based catalysts have coordination propertiesCarbon monoxideThe purity of hydrogen fuel is important because its activity decreases due to hydrocarbons, oxygen, water vapor and the like. Contains these as impuritiesReformingThe use of hydrogen is undesirable.
Although it is rarely seen in the research and development of fuel cells as of the 21st century,Apollo project,space shuttleHas been widely put into practical use.Apollo 13The accident at XNUMX is caused by the malfunction of the liquid oxygen supply system that supplies the fuel cell, and is not a problem of the fuel cell itself.
Daihatsu industry TheNational Institute of Advanced Industrial Science and TechnologyIn collaboration withHydrazine(N2H4·H2O) as fuel and achieved a power density of 0.50 W/cm2.. In this case, the fuel cell is free of hydrocarbons and the emissions are water.nitrogenWill only be.
Direct fuel cell (DFC)
A direct fuel cell (DFC) is a type that directly supplies fuel to a cell stack without going through a reformer.methanol,ethanol,Dimethyl ether,Hydrazine,Formaldehyde,Formic acid,ammoniaEtc. have been tried[Note 6].. In other words, DFC is not a term for the method of the fuel cell itself.Solid oxide fuel cellBelong to DFC. When carbon is included in the substance used as fuel, the reaction (power generation)carbon dioxideAre generated and discharged. Therefore, the electrolyte of alkaline aqueous solutionCarbonateCannot be used as it will generate.HydrazineWhen using a reducing fuel such asPrecious metalBecause the catalyst of is unnecessary,Precious metal-free liquid fuel fuel cellBe noted as. It is classified into a passive type and an active type depending on whether to use a fuel supply pump or a heat radiation fan. Fuel poleplatinumIn addition, carbon monoxide, which is a reaction intermediate, is strongly adsorbed (poisoned), the reaction rate is slow, and fuel crossover occurs when a highly water-soluble fuel is used. You can make lightweight ones.Direct methanol fuel cell(DMFC) is suitable for small-scale, small-power generation of several tens of mW-10W. These are considered to be used as power sources for small portable electronic devices. On the other hand, some stationary types have a power generation capacity of 1kw class..
Biofuel cell (BFC)
foodA fuel cell that applies a biological system that extracts energy from the[Note 7].. Enzymes and microorganisms are used as catalysts for oxidizing fuel. In a fuel cell using an enzyme, a strong enzyme that works stably against environmental changes is indispensable.lifeIt has been a challenge to extend the length.bloodInglucoseImplantable usingpacemakerIs being developed.. In the case of fuel cells using microorganisms, research is often conducted from the viewpoint of utilization of organic matter in wastewater.
Comparison of 4 methods
A comparison of the four major methods being researched and developed as of the beginning of the 21st century is shown.
Solid polymer type
Phosphoric acid form
Molten carbonate form
Solid oxide form
|Electrolyte||Electrolyte material||Ion exchange membrane||Phosphoric acid||Lithium carbonate, sodium carbonate||Stabilized zirconia, etc.|
|Usage form||membrane||Impregnate matrix||Impregnation or paste in matrix||Thin film, thin plate|
|Operating temperature (℃)||80-100||190-200||600-700||600-1,000|
|fuel||hydrogen||Hydrogen, carbon monoxide|
|Power generation efficiency(%)||30-40||40-45||50-65||50-70|
|Assumed power generation output||Several W-several tens of kW||100-several hundred kW||250kW-several MW||Several kW-several tens of MW|
|Assumed use||Mobile terminal, home power supply, automobile||Stationary power generation||Home power, stationary power generation|
|Developmental status||Domestic sales for domestic use started in 2009, domestic sales for automobiles started in 2015||Has a large track record as an always-on emergency power source for sewage treatment plants, hospitals, office buildings, etc.||Has a track record outside Japan and is expanding||Domestic sales started in 2011 (Ene farm), 250 kW class stationary type (combined type with MGT (micro gas turbine)) will be released in 2018|
The principle of fuel cell1801ToThe United Kingdom OfHumphrey DavyInvented by The prototype of the fuel cell that leads to the current fuel cell1839To britishWilliam GroveMade by. This fuel cellelectrodeToplatinumTo the electrolyteDilute sulfuric acidUsing,hydrogenとoxygenPower from the water, and use this power toElectrolysisI was able to
Then the fuel cell is run by the heat engineGeneratorAlthough it was forgotten as a power generation system for a while due to the introduction of W. Thomas Grubb, a chemist who worked for General Electric Company (GE) in 1955,Sulfo groupQualified withstyrenebyIon exchange membraneWe have developed an improved fuel cell that uses as an electrolyte. Three years later, another GE chemist, Leonard Niedrach, succeeded in reducing the amount of platinum used as a catalyst and became known as the Grubb-Niedrach fuel cell. GE was in the process of developing and using this technology at the timeUS Aerospace AgencyThis was the first practical application of a fuel cell, which was adopted by working on the Gemini space program.
1965ToThe United States of AmericaIs the manned space flight plan ofGeminiNo. 5 hydrocarbon systemResinA polymer electrolyte fuel cell using a fuel cell has been adopted, and the fuel cell has been receiving attention again. 1959,Francis thomas baconSucceeded in developing a 5kW stationary fuel cell. In 1959, a team led by Harry Ihrig unveiled a 15kW fuel cell tractor at the Alice Charmers, Inc., Wisconsin, US Transnational Fair. This systemPotassium hydroxideWas used as an electrolyte to react compressed hydrogen with oxygen. In 1959, Bacon and co-workers showed that a 5 kW device could be used to power a welder. 1960s,Pratt & WhitneyThe company licensed Bacon's US patent to power and power a spacecraft under the US Space Program.Apollo projectからspace shuttleUntil then, fuel cells were used as power sources and drinking water sources. At that time, as a result of examination based on reliability of materials, an alkaline electrolyte fuel cell was adopted.
As a consumer fuel cell,CogenerationResearch and development continued for systems and power generation facilities. In Japan,Ministry of International Trade and IndustryEnergy conservation policy ofMoonlight planBased on this, the development of phosphoric acid type, molten carbonate type fuel cells and solid electrolyte type fuel cells was started. In 1982, Toshiba constructed a 50 kW phosphoric acid fuel cell experimental plant at the Hamakawasaki Plant and succeeded in generating power for the first time as a pressurized type in Japan. Established UTC and IFC in Connecticut (USA) in 1985, started joint development of the world's largest 11MW class plant, and in 1991 established 11MW experimental plant.TEPCOIt was completed at the Goi Thermal Power Station, and the demonstration operation of a phosphoric acid fuel cell with an output of 1 kW was performed.
1987,カナダ OfBallad power systemCompanyFluorineWe have developed a polymer electrolyte fuel cell using a polymer resin (Nafion) as an electrolyte membrane. Due to the excellent durability of this electrolyte membrane, fuel cells have come to the center of attention again, and research and development have become popular.
RiceDepartment of DefenseDepartment of Defense Advanced Research Projects (DARPA) Lawrence H. Dubois focused on fuel cells powered by various liquid hydrocarbons (methanol, ethanol, etc.)University of Southern California(USC) belonged to the Loker Hydrocarbon LaboratoryacidWith expert Surya Prakash,Nobel PrizeAward winnerGeorge A. OllerI called out to. USCJet Propulsion Laboratory,California Institute of TechnologyInvented a system for direct oxidation of liquid hydrocarbons with the cooperation ofDirect methanol fuel cellIt was named (DMFC).
1994, Daimler Benz (at that time)Fuel cell carAnnounced a prototype car. Also,ToyotaIt is,1997 OfTokyo Motor ShowAnnounced a prototype of a fuel cell vehicle and announced that it would be mass-produced by 2005[Note 8].
2002In May,Toyota/FCHVandHonda FCX OfFuel cell carThe first commercialJapanese GovernmentDelivered toJunichiro KoizumiThe Prime Minister took a test drive. They arePrime Minister's OfficeとMinistry of Economy, Trade and IndustryUsed in 24 hours fullmaintenanceIt became a lease contract with a system.
2003IsTokyo Metropolitan Bureau of TransportationTo ToyotaHino MotorsDelivered fuel cell bus made by2004Until the endOdaibaOperated in the surrounding area. In 2005Aichi ExpoMade by HinoFCHV-BUSWas delivered. Also in 2004NissanAlso横 浜 市Etc. Used in the Aichi Expo since 2006Hydrogen stationWas relocatedChubu International AirportBut it is operating. It can be said that these public buses are fuel cell vehicles that can be boarded by the general public.
Mainly in the 1980-1990s, phosphoric acid fuel cells were "first-generation fuel cells", molten carbonate fuel cells were "second-generation fuel cells", and solid-state oxidation was used depending on the stage of fuel cell development. There was also a time when solid-state fuel cells were called "third generation fuel cells," but since solid polymer fuel cells became the main players in development,21st centuryAt present, this name is rarely used.
For practical use of fuel cells,Fire Service Act,High Pressure Gas Safety Act,Electricity Business Lawas well as the Building Standards Law(For those that use methanol as fuel,Poisonous and deleterious substance handling method), etc., is required to be relaxed, and the technical standards for electrical equipment have been reviewed. In October 2002, the US Department of Transportation allowed fuel cells to be brought in on airplanes, and promptly announced a policy of deregulation toward the spread of fuel cells. There are also movements to set international standards for safety standards and performance evaluations.
In 1998,International Electrotechnical CommissionTC105, the 105th technical committee within the (IEC), was established to discuss standardization of fuel cells in the electrical field, and eight standards have already been defined. In addition, standardization outside the electrical fieldInternational Standards Organization(ISO).
Challenges to spread
The biggest challenge to popularizing fuel cells is cost. Both the initial cost at the time of purchase and the running cost for the period of use are high, which has hindered its popularization. Furthermore, issues such as improvement of durability and power generation efficiency, extension of electrolyte life, and infrastructure development have been pointed out... Efforts to overcome these issues are being continued by both the public and private sectors. An example in which local governments and companies collaborate to build infrastructure for automobilesIn addition to being seen, subsidies are also provided for installation at home.
In particular,2011May 3 OfGreat East Japan EarthquakeSince then, it has become more popular, and even though it does not always save utility bills at the moment, it has added a budget for subsidies... The amount of subsidy is decreasing as the price decreases. While there are cases where homes equipped with solar cells and storage batteries are released, the need for further cost reduction of these "3 batteries" has been pointed out... In recent yearsCogenerationAs a kind ofFixed price purchase systemIn addition to the target of.
As of 2007, in EuropeCamper vanAtmethanolWas developed, and in the spring of 2009, sales of products with adjusted ethanol concentration were started as Japanese specifications. Also,Liquefied petroleum gas Those using (LPG) will be adopted over the next few years.. A 400kW PAFC made by UTC Power, a phosphoric acid fuel cell, isFreedom Tower12 units will be installed.
In addition, it was broadcast on June 2009, 6Television Tokyo Channel 12, Ltd."News Morning Satellite, A Kyoto venture companyMobile phone,Digital audio playerA small fuel cell that uses hydrogen as fuel by separating hydrogen from water in 2010 springconvenience storeIt was reported that it will start selling at a price that "you can buy with pocket money for high school students", but details are unknown.
August 2009, 10,ToshibaLaunched a limited number of small models that use methanol as fuel to charge mobile devices.. IEC (International Electrotechnical Commission) Of the safety standard (provisional version).
In the description of fuel cells, some specific terms are used. Some terms are general, but others have their own meaning only for fuel cells.
- In the field of batteries, "cell" refers to the simplest battery including both electrodes, electrolyte and separator. On the other hand, "battery" refers to the entire assembled battery. In a fuel cell, a single fuel cell that is not stacked is usually called a “unit cell”, a “single cell” or simply a “cell”.
- A single-plate unit cell is a stack of them. Horizontally striped or vertically striped unit cells are either stacked one above the other or connected in series. Both are connected in series. Also called "cell stack".
- Fuel pole
- anodeThat is, the anode, which means the electrode that loses electrons, is called the "fuel electrode," which means the side that supplies fuel such as hydrogen. Based on the direction of voltage at the electrode terminalsPositive electrode,Negative electrodeBased on the direction of currentanode,CathodeFor the nameanode-cathodeThe term is confusing because it is used for both the meaning of high and low potential and the meaning of current flow. Therefore, it is common to select the supply gas as the name of the electrode.
Fuel electrode=anode=(anode)=negative electrode. In other words, it is the negative pole of a normal battery.
- Air pole
- CathodeThe cathode, which means the electrode on the side from which electrons are obtained, is called an "air electrode" or "oxygen electrode", which means the side on which air containing oxygen is supplied.
Air electrode=cathode=(cathode)=positive electrode. In other words, it is the positive pole of a normal battery.
- It is a main component of the cell and is called a separator because it separates hydrogen by sandwiching hydrogen on one side and oxygen on the other side. It is preferable to be thin because it is necessary to pass an electric current between both surfaces with electric resistance as low as possible, but it is often thick because it has grooves for hydrogen, oxygen, and cooling water channels. Highly concentrated hydrogen ions are strongly acidic, so they are often made of graphite or metals with corrosion resistance..
It must have electronic conductivity, no ionic conductivity, be rigid, and be impermeable to gas and liquid. In a lithium-ion battery or the like, a “separator” refers to a layer that electrostatically insulates the positive and negative electrodes in the portion through which ions pass, and in a fuel cell, it corresponds to the electrolyte layer, and caution is required.
- ^ The representative manufacturer of phosphoric acid fuel cells is UTC Power (United technologiesSubsidiary)Fuji Electric SystemsSuch. Fuji Electric Systems' 100kW PAFC was the first fuel cell in 2008 to be certified as an emergency power source for firefighting in Japan.
- ^ The leading manufacturers of molten carbonate fuel cells are Fuel Cell Energy andIshikawajima Harima Heavy IndustriesAnd so on.
- ^ The maximum power generation efficiency of PEFC is nominally 37.5% LHV.
- ^ The representative manufacturers of solid oxide fuel cells areSiemens-Westinghouse,Mitsubishi Heavy Industries,Japanese special pottery,TOTO,Mitsubishi Materials(Kansai Electric Power),KyoceraAnd so on.
- ^ 2005 months from November 11,Osaka GasAnd Kyocera conducted a demonstration test of a 1kW generator using SOFC in an apartment house using city gas. This provided a hot water output of 660W, and the average daily power generation efficiency was 1% (LHV). From 44.1,Ministry of Economy, Trade and IndustryEtc.New Energy FoundationHowever, the 4 plants from 29 manufacturers conducted SOFC demonstration tests using city gas, LPG and kerosene, and the average power generation efficiency was 35% (LHV). The empirical research was continued until FY2010, and a total of 233 units were used for the empirical research.Mitsubishi MaterialsとKansai Electric PowerHas experimentally operated a 10kW class cogeneration power generator using SOFC using city gas as fuel and has achieved a power generation efficiency of 50%.NEDOIs commissioning four corporate groups to experiment with SOFC power generators with 4kW to 10kW output. One of themMitsubishi Heavy IndustriesSOFC power generation using city gas ofMicro gas turbineThis is a combined power generation that combines power generation, and waste was eliminated by combusting unreacted hydrogen generated from SOFC and by-product gas consisting of carbon monoxide in a micro gas turbine. (Source: Basic master of fuel cell ISBN-978 4485610077）
- ^ It is also considered as a fuel for DFC.
- ^ Sewage digestion gas and methane called biogas fuel cellfermentationIt is different from a fuel cell that uses gas.
- ^ Toyota's fuel cell vehicles are mainly government agenciesleaseThe contract was signed, and for general consumers a gasoline engine and a nickel-metal hydride storage battery (thenLithium ion storage batteryThe company has decided to sell hybrid vehicles that have a combination of
- ^ Atsushi Tsutsumi "Super combustion technology"Journal of the Combustion Society of Japan, Vol. 50, No. 151, 2008, pp. 39-43, two:10.20619 / jcombsj.50.151_3.
- ^ Fuel cells that can store electricity, larger capacity and cheaper than lithium (Smart Japan)
- ^ Introduced the first commercial molten carbonate fuel cell (MCFC) unit-Conducting a combined study with a waste gasifier- September 2002, 9 Chubu Electric Power
- ^ Developed the world's most efficient fuel cell(June 2009, 06 NGK Insulators, Ltd.)
- ^ Expansion of lineup of household fuel cells "ENE-FARM"
- ^ "New development of basic technology for fuel cells that does not use precious metals, which enables zero CO2 emissions, resource saving, and low cost”. Daihatsu Industries (September 2007, 9). 2020th of February 12Browse.(Technical details Attachment <PDF>）
- ^ IHI, fuel cell powered by ammonia No reformer required - Nihon Keizai Shimbun
- ^ "Enzyme type biofuel cell using glucose". Hydrogen energy system (Hydrogen Energy Society) 36 (2): 32-6. (2011) 2016th of February 8Browse..
- ^ a b c d Shigeru Tanabe, "Fundamental Master of Fuel Cells," Densho Shoin, January 2009, 1, 31st edition, 1st edition ISBN 9784485610077
- ^ Fuel cell car era will not come for the time being Nikkei Business Online March 2006, 7
- ^ Toyota aims to popularize fuel cell vehicles in collaboration with Saitama City, Atmark ITI Monoist, August 2011
- ^ ENE-FARM subsidy, environmental business
- ^ Government subsidies revived in response to rapidly expanding demand for ENE-FARM, Atmark Itty Monoist, October 2011
- ^ 3 Battery system finally commercialized Nikko Keikaku Ecology, October 2011
- ^ BlueGen Qualifies for UK Feed-In Tariff, 25 Aug 2011
- ^ Tadashi Watanabe, "Environmental disturbance seen by chemists"Production Studies" 2007 Vol. 59, No. 5, p. 425-440, two:10.11188 / seisankenkyu.59.425, Institute of Industrial Science, University of Tokyo
- ^ EFOY Fuel Cell now available ex works on all Dethleffs motor homes SFC Smart Fuel Cell, July 16, 2007
- ^ First year of new battery ③ Fuel cell at convenience storeTV TOKYO "News Morning Satellite" June 2009, 6
- ^ Toshiba press release.
- ^ "Under demonstration”. Unknown. 20191016Browse.
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