JPH0439189B2 - - Google Patents

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Publication number
JPH0439189B2
JPH0439189B2 JP59151243A JP15124384A JPH0439189B2 JP H0439189 B2 JPH0439189 B2 JP H0439189B2 JP 59151243 A JP59151243 A JP 59151243A JP 15124384 A JP15124384 A JP 15124384A JP H0439189 B2 JPH0439189 B2 JP H0439189B2
Authority
JP
Japan
Prior art keywords
fuel cell
power generation
fuel
generation system
resistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP59151243A
Other languages
Japanese (ja)
Other versions
JPS6132362A (en
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP59151243A priority Critical patent/JPS6132362A/en
Publication of JPS6132362A publication Critical patent/JPS6132362A/en
Publication of JPH0439189B2 publication Critical patent/JPH0439189B2/ja
Granted legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04223—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
    • H01M8/04231—Purging of the reactants
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04223—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
    • H01M8/04225—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells during start-up
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04223—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
    • H01M8/04228—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells during shut-down
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/043—Processes for controlling fuel cells or fuel cell systems applied during specific periods
    • H01M8/04302—Processes for controlling fuel cells or fuel cell systems applied during specific periods applied during start-up
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/043—Processes for controlling fuel cells or fuel cell systems applied during specific periods
    • H01M8/04303—Processes for controlling fuel cells or fuel cell systems applied during specific periods applied during shut-down
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04746—Pressure; Flow
    • H01M8/04761—Pressure; Flow of fuel cell exhausts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04858—Electric variables
    • H01M8/04865—Voltage
    • H01M8/0488—Voltage of fuel cell stacks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Fuel Cell (AREA)

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、燃料電池発電システムおよびその運
転方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fuel cell power generation system and a method of operating the same.

［従来の技術］ 燃料電池発電システムは、LNG等の化石燃料
を原燃料とし、水蒸気改質器等より燃料電池に適
した水素リツチなガスに変換し、燃料電池に燃料
として供給し、一方、酸化剤には、常圧、また
は、コンプレツサ等で加圧された圧縮空気が用い
られ、燃料電池に供給され、燃料中の水素と空気
中の酸素とが燃料電池の電解質を介して電気化学
的に反応し、直流電力を発生する発電システムで
ある。[Conventional technology] A fuel cell power generation system uses fossil fuels such as LNG as raw fuel, converts them into hydrogen-rich gas suitable for fuel cells using a steam reformer, etc., and supplies the hydrogen-rich gas to the fuel cells as fuel. The oxidizing agent used is normal pressure or compressed air pressurized by a compressor, etc., and is supplied to the fuel cell, where hydrogen in the fuel and oxygen in the air are electrochemically mixed through the electrolyte of the fuel cell. This is a power generation system that generates DC power in response to

このような燃料電池発電システムにおいては、
停止時に電池内に反応物質が存在すると、電圧が
発生し、電極触媒の劣化等の悪影響をおよぼす。 In such a fuel cell power generation system,
If a reactant is present in the battery when the battery is stopped, a voltage is generated, which causes adverse effects such as deterioration of the electrode catalyst.

そのため、例えば特開昭55−19713号に記載さ
れているように、従来は、停止時にはガスの供給
を停止すると共に、直流出力端にダミーの抵抗体
を接続していた。つまり、電池内に残留した反応
物質をダミー抵抗を流れる電流として消費させる
ことにより、電池内に、電池反応について不活性
な窒素ガスのみを残していた。 For this reason, conventionally, as described in Japanese Patent Application Laid-open No. 19713/1983, the gas supply was stopped at the time of shutdown, and a dummy resistor was connected to the DC output end. In other words, by consuming the reactant remaining in the battery as a current flowing through a dummy resistor, only nitrogen gas, which is inactive for battery reactions, remains in the battery.

［発明が解決しようとする課題］ しかし、上記従来技術による方法では、ガスの
供給が停止している状態で電流を流すことになる
ため、電極の反応界面においては、反応物質が局
部的に不足するおそれが有りうる。[Problem to be solved by the invention] However, in the method according to the above-mentioned conventional technology, since current is passed while the gas supply is stopped, there is a local shortage of reactants at the reaction interface of the electrode. There is a possibility that

燃料電池の触媒としては通常、白金が使用され
る。この白金に対して、水素は酸素に比べて脱着
しやすいため、とくに水素が不足しやすいと考え
られる。 Platinum is commonly used as a catalyst in fuel cells. Since hydrogen is more easily desorbed from platinum than oxygen, it is thought that hydrogen is particularly likely to become insufficient.

この場合、水素の不足した部分においては、腐
食電流が発生して電極を損傷する可能性が有る。 In this case, there is a possibility that a corrosion current will occur in the hydrogen-deficient portion and damage the electrode.

本発明の目的は、運転停止時に、電極に負担を
かけることなく電池内の残留反応物質を、有効に
除去しうる燃料電池発電システムおよびその運転
方法を提供することである。 An object of the present invention is to provide a fuel cell power generation system and a method for operating the same, which can effectively remove residual reactants within the cell without placing a burden on the electrodes when the system is stopped.

［課題を解決するための手段］ 本発明は上記目的を達成するためになされたも
ので、燃料として化石燃料を改質して得られる水
素リツチなガスを用い、酸化剤として、空気を用
い、燃料電池に前記ガスおよび前記空気を供給
し、電力を得る燃料電池発電システムにおいて、
前記燃料電池の直流出力端に、開閉器を介して抵
抗体を設け、前記燃料電池発電システムの停止時
に、前記抵抗体を前記開閉器により、断続的に前
記燃料電池直流出力端に接続することを特徴とす
る。[Means for Solving the Problems] The present invention has been made to achieve the above object, and uses a hydrogen-rich gas obtained by reforming fossil fuel as a fuel, air as an oxidizing agent, In a fuel cell power generation system that supplies the gas and the air to a fuel cell to obtain electric power,
A resistor is provided at the DC output end of the fuel cell via a switch, and the resistor is intermittently connected to the fuel cell DC output end by the switch when the fuel cell power generation system is stopped. It is characterized by

また、他の態様としては、燃料として化石燃料
を改質して得られる水素リツチなガスを用い、酸
化剤として、空気を用い、燃料電池に前記ガスお
よび前記空気を供給し、電力を得る燃料電池発電
システムにおいて、前記燃料電池の直流出力端に
接続される抵抗体と、前記燃料電池発電システム
の停止時に、前記抵抗体を断続的に前記燃料電池
直流出力端に接続する開閉器とを有することを特
徴とする燃料電池発電システムが提供される。 In another embodiment, hydrogen-rich gas obtained by reforming fossil fuel is used as the fuel, air is used as the oxidizing agent, and the gas and air are supplied to a fuel cell to generate electricity. The battery power generation system includes a resistor connected to a DC output end of the fuel cell, and a switch that intermittently connects the resistor to the fuel cell DC output end when the fuel cell power generation system is stopped. A fuel cell power generation system is provided.

［作用］ 本発明は燃料電池の直流出力端に接続された抵
抗体を、開閉器により断続的に接続することによ
り、反応物質が電極の反応界面において局部的に
不足状態になることを回避しつつ、残留反応物質
を消費して除去するものである。[Function] The present invention prevents the reactant from becoming locally insufficient at the reaction interface of the electrode by intermittently connecting the resistor connected to the DC output end of the fuel cell using a switch. At the same time, residual reactants are consumed and removed.

［実施例］ 以下、本発明の実施例を添付図面に基づいて説
明する。[Example] Hereinafter, an example of the present invention will be described based on the accompanying drawings.

第１図は本発明の一実施例を示す燃料電池発電
プラントの要部構成図を示す。燃料電池群１に燃
料供給ライン２および空気供給ライン３から発電
に必要な反応成分が供給される。発生した直流電
力はインバータ１１で交流電力に変換され、電力
系統負荷１２に接続される。プラント停止時に
は、燃料及び空気供給ラインにそれぞれ設けられ
た遮断弁５，６により反応物質の供給を停止し、
パージライン４に設けられた遮断弁７，８を開
き、燃料電池１をパージする。 FIG. 1 shows a block diagram of the main parts of a fuel cell power generation plant showing one embodiment of the present invention. Reaction components necessary for power generation are supplied to the fuel cell group 1 from a fuel supply line 2 and an air supply line 3. The generated DC power is converted into AC power by an inverter 11 and connected to a power system load 12. When the plant is stopped, the supply of reactants is stopped by cutoff valves 5 and 6 provided in the fuel and air supply lines, respectively,
The shutoff valves 7 and 8 provided in the purge line 4 are opened to purge the fuel cell 1.

また、燃料電池の直流出力端に抵抗体１０を接
続することにより、電池群１内の残留反応物質を
消費する。 Furthermore, by connecting the resistor 10 to the DC output end of the fuel cell, the residual reactant in the battery group 1 is consumed.

本実施例においては、この時、制御系統１３に
より、この抵抗体１０の接続を断続的なものとし
ているため、反応物質の消費も断続的となる。す
なわち、反応界面に反応物質が拡散してくるのを
待ちながら、反応を進めている。そのため、電極
の反応界面おいて局部的に反応物質が不足するこ
とによる腐食電流の発生を防止しうる。 In this embodiment, since the control system 13 connects the resistor 10 intermittently, the consumption of the reactant is also intermittently. In other words, the reaction progresses while waiting for the reactant to diffuse into the reaction interface. Therefore, generation of corrosion current due to a local shortage of reactant at the reaction interface of the electrode can be prevented.

実際の測定結果を第２図ｂに示す。なお、比較
のため抵抗体１０を使用しない場合の測定結果を
第２図ａに示す。 The actual measurement results are shown in Figure 2b. For comparison, the measurement results when the resistor 10 is not used are shown in FIG. 2a.

測定結果から明らかなように、本実施例によれ
ば、抵抗体１０を使用しない場合と比べて、停止
時間の短縮化が図られている。さらに、抵抗体１
０をOFFにしているときの電池電圧の上昇、つ
まり、反応界面における反応物質の濃度の回復
が、観測されて降り、腐食電流は発生しにくい状
態となつている。 As is clear from the measurement results, according to this embodiment, the stop time is shortened compared to the case where the resistor 10 is not used. Furthermore, resistor 1
When the battery voltage is turned off, an increase in the battery voltage, that is, a recovery in the concentration of the reactant at the reaction interface, is observed, and the state is such that corrosion current is less likely to occur.

以上説明したように、上記実施例においては、
燃料電池の停止時に必要とされる時間を短縮しつ
つ、電極の損傷を防止しうるという効果が得られ
る。 As explained above, in the above embodiment,
This has the effect of reducing the time required to stop the fuel cell and preventing damage to the electrodes.

［発明の効果］ 以上説明したように本発明の燃料電池発電シス
テムおよびその運転方法によれば、パージ中の電
池電圧が電池保護レベル以下になるまでの所要時
間が短縮される。[Effects of the Invention] As explained above, according to the fuel cell power generation system and the operating method thereof of the present invention, the time required for the battery voltage to fall below the battery protection level during purging is shortened.

さらに、停止動作中の電池電圧が低い状態、す
なわち、反応界面において反応物質が極度に不足
する状態が続くことを回避し、腐食電流の発生を
防止して、電極の損傷を防ぎうる。 Furthermore, it is possible to avoid a state in which the battery voltage is low during the stop operation, that is, a state in which the reactant is extremely insufficient at the reaction interface, and to prevent corrosion current from occurring and damage to the electrodes.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一実施例の燃料電池発電シス
テムの要部構成図、第２図は本発明の効果を示す
パージ時間と電池電圧の関係を示すグラフであ
る。 １……燃料電池群、２……燃料供給ライン、３
……空気供給ライン、４……パージライン、９…
…開閉器、１０……抵抗体、１３……制御系統。 FIG. 1 is a block diagram of essential parts of a fuel cell power generation system according to an embodiment of the present invention, and FIG. 2 is a graph showing the relationship between purge time and battery voltage, showing the effects of the present invention. 1...Fuel cell group, 2...Fuel supply line, 3
...Air supply line, 4...Purge line, 9...
...Switch, 10...Resistor, 13...Control system.

Claims (1)

【特許請求の範囲】 １ 燃料として化石燃料を改質して得られる水素
リツチなガスを用い、酸化剤として、空気を用
い、燃料電池に前記ガスおよび前記空気を供給
し、電力を得る燃料電池発電システムにおいて、 前記燃料電池の直流出力端に、開閉器を介して
抵抗体を設け、前記燃料電池発電システムの停止
動作時に、前記抵抗体を前記開閉器により、断続
的に前記燃料電池直流出力端に接続することを特
徴とする燃料電池発電システムの運転方法。 ２ 燃料として化石燃料を改質して得られる水素
リツチなガスを用い、酸化剤として、空気を用
い、燃料電池に前記ガスおよび前記空気を供給
し、電力を得る燃料電池発電システムにおいて、 前記燃料電池の直流出力端に接続される抵抗体
と、前記燃料電池発電システムの停止動作時に、
前記抵抗体を断続的に前記燃料電池直流出力端に
接続する開閉器とを有することを特徴とする燃料
電池発電システム。[Claims] 1. A fuel cell that uses a hydrogen-rich gas obtained by reforming fossil fuel as a fuel, uses air as an oxidizing agent, and supplies the gas and air to a fuel cell to obtain electric power. In the power generation system, a resistor is provided at a DC output end of the fuel cell via a switch, and when the fuel cell power generation system is stopped, the resistor is intermittently connected to the DC output of the fuel cell by the switch. A method of operating a fuel cell power generation system, characterized in that the fuel cell power generation system is connected at the end. 2. A fuel cell power generation system that uses a hydrogen-rich gas obtained by reforming fossil fuel as a fuel, uses air as an oxidizing agent, supplies the gas and the air to a fuel cell, and obtains electric power, the fuel A resistor connected to the DC output end of the battery, and when the fuel cell power generation system is stopped,
A fuel cell power generation system comprising: a switch that intermittently connects the resistor to the DC output end of the fuel cell.
JP59151243A 1984-07-23 1984-07-23 Fuel cell power generation system and its operating method Granted JPS6132362A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59151243A JPS6132362A (en) 1984-07-23 1984-07-23 Fuel cell power generation system and its operating method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59151243A JPS6132362A (en) 1984-07-23 1984-07-23 Fuel cell power generation system and its operating method

Publications (2)

Publication Number Publication Date
JPS6132362A JPS6132362A (en) 1986-02-15
JPH0439189B2 true JPH0439189B2 (en) 1992-06-26

Family

ID=15514387

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59151243A Granted JPS6132362A (en) 1984-07-23 1984-07-23 Fuel cell power generation system and its operating method

Country Status (1)

Country Link
JP (1) JPS6132362A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2593195B2 (en) * 1988-07-22 1997-03-26 三菱電機株式会社 How to stop operation of fuel cell
JPH088113B2 (en) * 1989-11-17 1996-01-29 三菱電機株式会社 Fuel cell generator
KR100471262B1 (en) * 2002-10-15 2005-03-10 현대자동차주식회사 Fuel cell system
JP4575683B2 (en) * 2004-03-05 2010-11-04 本田技研工業株式会社 Fuel cell system and fuel cell system restart method
EP2338198B1 (en) * 2008-09-17 2017-06-28 Belenos Clean Power Holding AG Method of shut-down and starting of a fuel cell

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5832903B2 (en) * 1978-07-28 1983-07-15 富士電機株式会社 How to stop a fuel cell
JPS58164163A (en) * 1982-03-25 1983-09-29 Kansai Electric Power Co Inc:The Stop control method of fuel cell generator

Also Published As

Publication number Publication date
JPS6132362A (en) 1986-02-15

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