JPH10284098A - Fuel cell power generating device - Google Patents
Fuel cell power generating deviceInfo
- Publication number
- JPH10284098A JPH10284098A JP9088217A JP8821797A JPH10284098A JP H10284098 A JPH10284098 A JP H10284098A JP 9088217 A JP9088217 A JP 9088217A JP 8821797 A JP8821797 A JP 8821797A JP H10284098 A JPH10284098 A JP H10284098A
- Authority
- JP
- Japan
- Prior art keywords
- fuel cell
- pressure
- fuel
- gas
- cell power
- 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.)
- Withdrawn
Links
Classifications
-
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、化学エネルギー
を電気エネルギーに変換して発電する燃料電池発電装置
に係わり、特に、燃料電池本体の窒素ガスによりガス置
換時、あるいは負荷遮断時等に、燃料極の過渡的な圧力
上昇が過大とならないよう防止する構成に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell power generation apparatus for generating electric power by converting chemical energy into electric energy. The present invention relates to a configuration for preventing a transient pressure increase of a pole from being excessive.
【０００２】[0002]
【従来の技術】図４は、従来の燃料電池発電装置の燃料
電池本体のガス供給排出系の基本構成を示すフロー図で
ある。燃料ガスは、燃料極供給配管１１を通して模式的
に表示された燃料電池本体１の燃料極へ供給される。燃
料極より排出された排出ガスは、再循環回路１２を通流
してエゼクタ２へと送られ、外部より供給される原燃料
と混合され燃料ガスとして再利用される構成である。再
循環回路１２には、逆止め弁６と絞り７を備えたガス放
出配管１３が備えられており、燃料極より排出された排
出ガスの圧力が上昇すると外部へと放出して圧力を所定
値に保持するよう機能している。なお、燃料極より排出
された排出ガスの圧力は、再循環回路１２に設けられた
圧力計５により計測される。一方、燃料電池本体１の空
気極には、空気極供給配管１４を通して空気が供給さ
れ、空気極排出配管１５を通して外部の大気へと排出さ
れるよう構成されている。2. Description of the Related Art FIG. 4 is a flowchart showing a basic configuration of a gas supply / discharge system of a fuel cell body of a conventional fuel cell power generator. The fuel gas is supplied to the fuel electrode of the fuel cell main body 1 schematically shown through the fuel electrode supply pipe 11. The exhaust gas discharged from the fuel electrode flows through the recirculation circuit 12 and is sent to the ejector 2, mixed with raw fuel supplied from the outside, and reused as fuel gas. The recirculation circuit 12 is provided with a gas discharge pipe 13 having a check valve 6 and a throttle 7. When the pressure of the exhaust gas discharged from the fuel electrode rises, the gas is discharged to the outside and the pressure is reduced to a predetermined value. Function. The pressure of the exhaust gas discharged from the fuel electrode is measured by a pressure gauge 5 provided in the recirculation circuit 12. On the other hand, air is supplied to the air electrode of the fuel cell main body 1 through the air electrode supply pipe 14, and is discharged to the outside atmosphere through the air electrode discharge pipe 15.
【０００３】燃料電池発電装置の運転時には、上記のよ
うに、燃料極へ燃料ガス、また空気極へ空気が供給され
るが、運転の停止時には、内部、特に燃料極に滞留する
可燃性ガスを外部へと放出して安全なガスで置換する必
要がある。このため、上記の構成においては、窒素供給
配管１６の遮断弁３、４を開けて、燃料極および空気極
へ窒素が送られる。[0003] During operation of the fuel cell power generator, as described above, fuel gas is supplied to the fuel electrode and air is supplied to the air electrode. However, when operation is stopped, flammable gas remaining inside the fuel cell, particularly at the fuel electrode, is supplied. It must be released to the outside and replaced with a safe gas. Therefore, in the above configuration, nitrogen is sent to the fuel electrode and the air electrode by opening the shutoff valves 3 and 4 of the nitrogen supply pipe 16.
【０００４】[0004]
【発明が解決しようとする課題】燃料電池発電装置の運
転の停止時には、効果的にガス置換を行うために、大量
の窒素が供給される。したがって、上記のごとき構成の
ガス供給排出系においては、燃料極の出口より再循環回
路１２へと排出される排出ガス量が急激に増大し、これ
に伴ってガス放出配管１３より外部へと放出されるガス
量も増大することとなる。これに対して、ガス放出配管
１３には、通常運転時に放出されるガス量に対応して圧
力を制限する絞り７が備えられているので、放出される
ガス量が増大すると絞り７における圧力損失が急激に増
大する。このため、再循環回路１２の圧力、したがって
燃料極の圧力が上昇し、燃料極と空気極との間の差圧が
一時的に大きくなる。すなわち、ガス置換に用いられる
窒素ガスの供給元の圧力は、通常、約１×105Pa 以上高
い圧力に保持されているのに対して、燃料電池本体１の
燃料極の耐圧力性能は１×104Pa 程度であり、過大な圧
力が加わって燃料電池本体１が損傷する恐れがある。ま
た、ガス置換の時以外でも、例えば、負荷遮断に伴って
燃料極内部での水素消費量を抑えると、燃料極の出口よ
り排出される排出ガス量が急激に増大するので、ガス置
換の時と同様に燃料極の圧力が上昇し、燃料極と空気極
との間の差圧が一時的に大きくなる事態が生じ、極間で
のガス漏洩を引き起こし、燃料電池本体１が損傷する恐
れがある。When the operation of the fuel cell power generation device is stopped, a large amount of nitrogen is supplied to effectively perform gas replacement. Therefore, in the gas supply / discharge system configured as described above, the amount of exhaust gas discharged from the outlet of the fuel electrode to the recirculation circuit 12 sharply increases, and accordingly, the amount of gas discharged from the gas discharge pipe 13 to the outside is increased. The amount of gas used will also increase. On the other hand, the gas discharge pipe 13 is provided with the throttle 7 that limits the pressure in accordance with the amount of gas released during normal operation. Increase rapidly. For this reason, the pressure of the recirculation circuit 12, that is, the pressure of the fuel electrode increases, and the pressure difference between the fuel electrode and the air electrode temporarily increases. That is, the pressure of the supply source of the nitrogen gas used for gas replacement is usually maintained at a high pressure of about 1 × 105 Pa or more, while the pressure resistance performance of the fuel electrode of the fuel cell body 1 is 1 × 104 Pa. And the fuel cell body 1 may be damaged due to excessive pressure. Further, even when the gas replacement is not performed, for example, if the amount of hydrogen consumed inside the fuel electrode is reduced due to load shedding, the amount of exhaust gas discharged from the outlet of the fuel electrode rapidly increases. Similarly, the pressure of the fuel electrode rises, and the pressure difference between the fuel electrode and the air electrode temporarily increases, causing gas leakage between the electrodes and possibly damaging the fuel cell body 1. is there.
【０００５】本発明の目的は、上記のごとき従来技術の
難点を解消して、運転停止に伴うガス置換、あるいは負
荷遮断等、燃料極の出口より排出されるガス量が急激に
増大する場合においても、燃料極の圧力の上昇が所定値
以内に抑制され、燃料電池本体の損傷を引き起こすこと
なく安全に、かつ安定して運転できる燃料電池発電装置
を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art and to reduce the amount of gas discharged from the outlet of the fuel electrode when the amount of gas discharged from the anode of the fuel electrode increases suddenly, such as gas replacement due to shutdown or load rejection. Another object of the present invention is to provide a fuel cell power generation device in which a rise in the pressure of the fuel electrode is suppressed within a predetermined value, and which can operate safely and stably without causing damage to the fuel cell body.
【０００６】[0006]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明においては、燃料電池の燃料極より排出さ
れる排出ガスを再循環回路を通してエゼクタへと導き、
外部より導入される原燃料と混合して燃料極へ供給する
燃料電池発電装置において、 (1) 再循環回路に、通流する排出ガスの圧力を測定する
圧力計と、逆止め弁と絞りとの直列接続体を具備し排出
ガスを外部へ放出するガス放出配管とを備え、さらに、
上記の圧力計の測定信号により開閉する遮断弁を備えた
バイパス配管を上記のガス放出配管に並列に備えること
とする。In order to achieve the above object, according to the present invention, exhaust gas discharged from a fuel cell anode is led to an ejector through a recirculation circuit.
In a fuel cell power generator that mixes with raw fuel introduced from the outside and supplies it to the anode, (1) a pressure gauge that measures the pressure of exhaust gas flowing through the recirculation circuit, a check valve and a throttle And a gas discharge pipe that discharges exhaust gas to the outside with a series connection body of
A bypass pipe having a shut-off valve that opens and closes according to a measurement signal of the pressure gauge is provided in parallel with the gas discharge pipe.
【０００７】(2) さらに上記(1) において、上記のバイ
パス配管と並列に、破裂板または安全弁よりなる放圧機
構を具備した放圧配管を備えることとする。 (3) さらに上記(2) において、外部より導入される原燃
料の供給量信号と発電装置の出力電流信号を入力して原
燃料供給量と燃料消費量とを算出し、その差より上記の
放圧配管からのガス漏洩を検知する演算装置を備えるこ
ととする。(2) Further, in the above (1), a pressure release pipe provided with a pressure release mechanism composed of a rupture disk or a safety valve is provided in parallel with the bypass pipe. (3) Further, in the above (2), a raw fuel supply amount signal and a fuel consumption amount are calculated by inputting an externally supplied raw fuel supply amount signal and an output current signal of the power generation device, and calculating the raw fuel supply amount and the fuel consumption amount from the difference. An arithmetic unit for detecting gas leakage from the pressure relief pipe is provided.
【０００８】(4) また、再循環回路に、通流する排出ガ
スの圧力を測定する圧力計と、この圧力計の測定信号に
より開度が制御される制御弁と逆止め弁との直列接続体
を備えたガス放出配管を備えることとする。 上記(1) のごとき構成の燃料電池発電装置においては、
燃料極の出口より排出されるガス量が急激に増大して圧
力が所定値以上に上昇すれば、通常運転時には閉状態に
ある遮断弁が、圧力計の測定信号により開状態へと移行
し、燃料極の出口より再循環回路に送られた排出ガス
が、絞りを介することなく外部へと放出されるので、再
循環回路の圧力、したがって燃料極の圧力が低く抑えら
れ、燃料極と空気極との間の差圧の上昇が抑制される。(4) A series connection of a pressure gauge for measuring the pressure of the exhaust gas flowing through the recirculation circuit, a control valve whose opening is controlled by a measurement signal of the pressure gauge, and a check valve. A gas release pipe with a body shall be provided. In the fuel cell power generator having the configuration as described in (1) above,
If the amount of gas discharged from the outlet of the fuel electrode rapidly increases and the pressure rises to a predetermined value or more, the shut-off valve in the closed state during normal operation shifts to the open state by the measurement signal of the pressure gauge, Exhaust gas sent from the outlet of the anode to the recirculation circuit is discharged outside without passing through the throttle, so that the pressure of the recirculation circuit, and hence the pressure of the anode, is kept low, and the anode and cathode Is suppressed from increasing.
【０００９】また、上記(2) のごとく構成すれば、長時
間にわたり閉状態に保持された遮断弁が、例えば弁体の
固着等を生じ、圧力計の測定信号を受けても開状態へと
移行しない事態が仮に生じても、圧力が基準値以上にな
ると遮断弁と並列に組み込まれた破裂板または安全弁よ
りなる放圧機構が作動することとなるので、再循環回路
の圧力、したがって燃料極の圧力の上昇が抑制される。Further, with the configuration as described in the above (2), the shut-off valve held in the closed state for a long time causes, for example, sticking of the valve body and the like, and becomes open even when receiving the measurement signal of the pressure gauge. Even if the situation does not occur, if the pressure exceeds the reference value, the pressure release mechanism consisting of a rupture plate or a safety valve incorporated in parallel with the shut-off valve will operate, so the pressure in the recirculation circuit, and thus the fuel electrode Is suppressed.
【００１０】また、上記(3) のごとく構成すれば、放圧
機構の作動に伴ってガスの漏出が生じると、演算装置に
より検知され、安全に処置することが可能となる。ま
た、上記(4) のごとく構成すれば、燃料極の出口より排
出されるガス量が急激に増大する場合にも、通常運転時
と同様に、圧力計の測定信号により開度が制御される制
御弁により制御された所要の排出ガスが絞りを備えない
ガス放出配管により外部へと放出されるので、再循環回
路の圧力、したがって燃料極の圧力が抑制されることと
なる。Further, with the configuration as described in the above (3), when a gas leaks due to the operation of the pressure release mechanism, it is detected by the arithmetic unit, and it is possible to take a safe treatment. Further, with the configuration as described in (4) above, even when the amount of gas discharged from the outlet of the fuel electrode sharply increases, the opening is controlled by the measurement signal of the pressure gauge as in the normal operation. Since the required exhaust gas controlled by the control valve is discharged to the outside through the gas discharge pipe having no throttle, the pressure of the recirculation circuit, and thus the pressure of the fuel electrode, is suppressed.
【００１１】[0011]
＜実施例１＞図１は、本発明の燃料電池発電装置の第１
の実施例の燃料電池本体のガス供給排出系の基本構成を
示すフロー図である。図において、図４に示した従来例
と同一の機能を有する構成部品には同一符号を付し、重
複する説明は省略する。図１の構成の図４の従来例の構
成との差異は、ガス放出管１３の逆止め弁６と絞り７と
の直列接続体に並列に、圧力計５の測定信号により開閉
する遮断弁８を備えたバイパス配管１７が設置されてい
る点にある。<Embodiment 1> FIG. 1 shows a first embodiment of a fuel cell power generator according to the present invention.
It is a flowchart which shows the basic structure of the gas supply / discharge system of the fuel cell main body of Example of this invention. In the figure, components having the same functions as those of the conventional example shown in FIG. 4 are denoted by the same reference numerals, and redundant description will be omitted. The configuration of FIG. 1 is different from the configuration of the conventional example of FIG. 4 in that a shutoff valve 8 that opens and closes in response to a measurement signal of a pressure gauge 5 in parallel with a series connection of a check valve 6 and a throttle 7 of a gas discharge pipe 13. In that a bypass pipe 17 provided with
【００１２】本構成においては、圧力計５で測定される
再循環回路１２の圧力が所定値以上になると遮断弁８が
閉状態から開状態へと移行し、再循環回路１２のガスが
バイパス配管１７を通流して、外部へと放出される。し
たがって、外部への放出ガス量が多量となっても、再循
環回路１２の圧力、したがって燃料極の圧力は、絞り７
での圧力損失の影響を受けることなく低く抑えられ、燃
料極と空気極との間の差圧の上昇が抑制されることとな
るので、差圧の上昇に伴う燃料電池本体の損傷が回避さ
れ、安全に、かつ安定して運転できることとなる。 ＜実施例２＞図２は、本発明の燃料電池発電装置の第２
の実施例の燃料電池本体のガス供給排出系の基本構成を
示すフロー図である。In this configuration, when the pressure of the recirculation circuit 12 measured by the pressure gauge 5 exceeds a predetermined value, the shut-off valve 8 shifts from the closed state to the open state, and the gas in the recirculation circuit 12 is supplied to the bypass pipe. 17 and is released to the outside. Therefore, even if the amount of gas released to the outside is large, the pressure of the recirculation circuit 12 and therefore the pressure of the fuel electrode is reduced by the throttle 7.
The pressure difference between the fuel electrode and the air electrode is suppressed without being affected by the pressure loss at the fuel cell, and the rise in the differential pressure between the fuel electrode and the air electrode is suppressed, so that damage to the fuel cell body due to the rise in the differential pressure is avoided. It is possible to drive safely and stably. <Embodiment 2> FIG. 2 shows a second embodiment of the fuel cell power generator according to the present invention.
It is a flowchart which shows the basic structure of the gas supply / discharge system of the fuel cell main body of Example of this invention.
【００１３】本構成の図１に示した第１の実施例の構成
との差異は、第１の実施例のガス放出管１３とバイパス
配管１７との並列接続体に、さらに破裂板１８を備えた
放圧配管１９が並列接続されていること、また、エゼク
タ２に供給される原燃料の流量を測定する原燃料流量計
２０と燃料電池本体１の電気出力の電流値を測定する出
力電流計２１の検出信号を入力して、原燃料供給量と燃
料消費量との差を算出する演算装置２２が組み込まれて
いることにある。The difference of this configuration from the configuration of the first embodiment shown in FIG. 1 is that a parallel connection body of the gas discharge pipe 13 and the bypass pipe 17 of the first embodiment further includes a rupturable plate 18. The discharge pressure pipe 19 is connected in parallel, and a raw fuel flow meter 20 for measuring the flow rate of the raw fuel supplied to the ejector 2 and an output ammeter for measuring the current value of the electric output of the fuel cell body 1 An arithmetic unit 22 for inputting the detection signal 21 and calculating the difference between the raw fuel supply amount and the fuel consumption amount is incorporated.
【００１４】本構成においては、バイパス配管１７に組
み込まれた遮断弁８が通常運転の閉状態に長期間保持さ
れることによって、例えば弁体の固着等を生じ、圧力計
５の指示を受けても遮断弁８が正常に動作しない事態が
仮に生じても、再循環回路１２の圧力が破裂板１８の設
定値を越えれば破裂板１８が破裂して、再循環回路１２
のガスは放圧配管１９を通して大気へと放出される。し
たがって、仮に遮断弁８が正常に動作しなくとも、燃料
極の圧力上昇が抑えられ、燃料電池本体の損傷が回避さ
れることとなる。また、演算装置２２によって原燃料供
給量と燃料消費量との差が算出されるので、この差より
放圧配管１９を通しての大気への漏出が検知されること
となる。したがって、この検知信号により自動的に運転
を停止することとすれば、燃料電池発電装置を安全に運
転することができる。In this configuration, the shut-off valve 8 incorporated in the bypass pipe 17 is maintained in the closed state of the normal operation for a long period of time, for example, causing the valve body to be stuck and receiving an instruction from the pressure gauge 5. Even if the shut-off valve 8 does not operate normally, if the pressure in the recirculation circuit 12 exceeds the set value of the rupture disk 18, the rupture disk 18 ruptures and the recirculation circuit 12
Is released to the atmosphere through the pressure release pipe 19. Therefore, even if the shut-off valve 8 does not operate normally, a rise in pressure of the fuel electrode is suppressed, and damage to the fuel cell body is avoided. Further, since the difference between the raw fuel supply amount and the fuel consumption amount is calculated by the arithmetic unit 22, the leakage to the atmosphere through the pressure relief pipe 19 is detected from the difference. Therefore, if the operation is automatically stopped by this detection signal, the fuel cell power generator can be safely operated.
【００１５】なお、図２の構成においては放圧配管１９
に破裂板１８を組み込むこととしているが、破裂板１８
に代わって、所定圧力で開状態へ移行する安全弁を用い
ることとしても同様の効果が得られることは例示するま
でもなく明らかである。 ＜実施例３＞図３は、本発明の燃料電池発電装置の第３
の実施例の燃料電池本体のガス供給排出系の基本構成を
示すフロー図である。In the configuration shown in FIG.
The rupture disk 18 is incorporated in the rupture disk 18.
It is obvious that the same effect can be obtained by using a safety valve that shifts to an open state at a predetermined pressure instead of the above example. <Embodiment 3> FIG. 3 shows a third embodiment of the fuel cell power generator of the present invention.
It is a flowchart which shows the basic structure of the gas supply / discharge system of the fuel cell main body of Example of this invention.
【００１６】図３の構成の図４、あるいは図１の構成と
の差異は、再循環回路１２に組み込まれたガス放出配管
１３が、圧力計５の測定信号により開度が制御される制
御弁１０と逆止め弁６との直列接続体を備えてなること
にある。本構成においては、圧力計５で測定される再循
環回路１２の圧力に対応して制御弁１０の開度が制御さ
れ、ガスはガス放出配管１３より外部へと放出される。
ガス放出配管１３には、従来例の絞りのような多大な圧
力損失を伴う構成部品を用いていないので、放出ガス量
が多量となっても圧力損失は小さい。したがって、多量
の放出ガスを伴う場合にあっても、再循環回路１２の圧
力、したがって燃料極の圧力が低く抑えられ、燃料極と
空気極との間の差圧の上昇が抑制され、差圧の上昇に伴
う燃料電池本体の損傷の発生が回避されることとなる。
なお、本構成においては、通常運転状態においても、圧
力計５の測定信号により制御弁１０が制御されて安定し
た圧力制御が得られることは言うまでもない。The difference between the configuration in FIG. 3 and the configuration in FIG. 4 or FIG. 1 is that the gas discharge pipe 13 incorporated in the recirculation circuit 12 is controlled by a control valve whose opening is controlled by a measurement signal from the pressure gauge 5. It is provided with a series connection body of 10 and the check valve 6. In this configuration, the opening of the control valve 10 is controlled in accordance with the pressure of the recirculation circuit 12 measured by the pressure gauge 5, and the gas is discharged to the outside from the gas discharge pipe 13.
Since the gas discharge pipe 13 does not use a component having a large pressure loss such as a conventional throttle, the pressure loss is small even if the amount of released gas is large. Therefore, even when a large amount of released gas is involved, the pressure of the recirculation circuit 12, and thus the pressure of the fuel electrode, is kept low, and the increase in the differential pressure between the fuel electrode and the air electrode is suppressed, and the differential pressure Therefore, it is possible to avoid the occurrence of damage to the fuel cell body due to the rise of the fuel cell.
In this configuration, it goes without saying that even in the normal operation state, the control valve 10 is controlled by the measurement signal of the pressure gauge 5 and stable pressure control can be obtained.
【００１７】[0017]
【発明の効果】上述のように、本発明によれば、燃料電
池の燃料極より排出される排出ガスを再循環回路を通し
てエゼクタへと導き、外部より導かれる原燃料と混合し
て燃料極へ供給する燃料電池発電装置において、 (1) 再循環回路に、通流する排出ガスの圧力を測定する
圧力計と、逆止め弁と絞りとの直列接続体を具備し排出
ガスを外部へ放出するガス放出配管とを備え、さらに、
上記の圧力計の測定信号により開閉する遮断弁を具備し
たバイパス配管をガス放出配管に備えることとしたの
で、ガス置換、あるいは負荷遮断等、燃料極より排出さ
れる排出ガス量が急激に増大する場合においても、遮断
弁が開いてガスが放出され、圧力の上昇が抑制されるこ
ととなり、燃料電池本体の損傷を引き起こすことなく安
全に、かつ安定して運転できる燃料電池発電装置が得ら
れることとなった。As described above, according to the present invention, the exhaust gas discharged from the fuel electrode of the fuel cell is guided to the ejector through the recirculation circuit, and mixed with the raw fuel introduced from the outside to the fuel electrode. In the fuel cell power generator to be supplied, (1) The recirculation circuit is equipped with a pressure gauge for measuring the pressure of the exhaust gas flowing therethrough, and a series connection of a check valve and a throttle to discharge the exhaust gas to the outside And a gas discharge pipe,
Since the gas discharge pipe is provided with a bypass pipe having a shut-off valve that opens and closes according to the measurement signal of the pressure gauge, the amount of exhaust gas discharged from the fuel electrode, such as gas replacement or load cutoff, increases rapidly. Even in this case, the shut-off valve is opened and gas is released, the rise in pressure is suppressed, and a fuel cell power generator that can be safely and stably operated without causing damage to the fuel cell body is obtained. It became.
【００１８】(2) さらに上記(1) において、上記のバイ
パス配管と並列に、破裂板または安全弁よりなる放圧機
構を具備した放圧配管を備えることとすれば、仮にバイ
パス配管に備えた遮断弁の開閉動作が不調であっても、
放圧機構の動作によりガスが放出され、圧力の上昇が抑
制されることとなる。したがって、燃料電池本体の損傷
を引き起こすことなく安全に、かつ安定して運転できる
燃料電池発電装置として、より好適である。(2) Further, in the above (1), if a pressure release pipe provided with a pressure release mechanism composed of a rupture plate or a safety valve is provided in parallel with the bypass pipe, the cutoff provided in the bypass pipe is temporarily provided. Even if the opening and closing operation of the valve is abnormal,
The gas is released by the operation of the pressure release mechanism, and the rise in pressure is suppressed. Therefore, it is more suitable as a fuel cell power generator that can operate safely and stably without causing damage to the fuel cell body.
【００１９】(3) さらに上記(2) において、外部より導
入される原燃料の供給量信号と発電装置の出力電流信号
を入力して原燃料供給量と燃料消費量とを算出し、その
差より上記の放圧回路からのガス漏出を検知する演算装
置を備えることとすれば、容易にガス漏出が検知され、
確実に運転停止を行うことが可能となるので、安全に、
かつ安定して運転できる燃料電池発電装置として、より
好適である。(3) Further, in the above (2), the raw fuel supply amount and the fuel consumption amount are calculated by inputting the raw fuel supply amount signal introduced from the outside and the output current signal of the power generator, and the difference between the raw fuel supply amount and the fuel consumption amount is calculated. If it is provided with a computing device for detecting gas leakage from the above pressure relief circuit, gas leakage is easily detected,
Since it is possible to stop operation reliably,
It is more suitable as a fuel cell power generator that can be operated stably.
【００２０】(4) また、再循環回路に、通流する排出ガ
スの圧力を測定する圧力計と、上記の圧力計の測定信号
により開度が制御される制御弁と逆止め弁との直列接続
体を備えたガス放出配管を備えることとしても、ガス置
換、あるいは負荷遮断等、燃料極より排出される排出ガ
ス量が急激に増大する事態が生じれば、制御弁が開き、
ガス放出配管よりガスが放出され、圧力の上昇が抑制さ
れるので、燃料電池本体の損傷を引き起こすことなく安
全に、かつ安定して運転できる燃料電池発電装置として
好適である。(4) A series of a pressure gauge for measuring the pressure of the exhaust gas flowing through the recirculation circuit, and a control valve and a check valve whose opening is controlled by the measurement signal of the pressure gauge. Even if a gas discharge pipe with a connector is provided, if a situation occurs in which the amount of exhaust gas discharged from the fuel electrode sharply increases, such as gas replacement or load shedding, the control valve opens,
Since gas is released from the gas discharge pipe and a rise in pressure is suppressed, it is suitable as a fuel cell power generation device that can be safely and stably operated without causing damage to the fuel cell body.
【図１】本発明の燃料電池発電装置の第１の実施例の燃
料電池本体のガス供給排出系の基本構成を示すフロー図FIG. 1 is a flowchart showing a basic configuration of a gas supply / discharge system of a fuel cell main body according to a first embodiment of the fuel cell power generator of the present invention.
【図２】本発明の燃料電池発電装置の第２の実施例の燃
料電池本体のガス供給排出系の基本構成を示すフロー図FIG. 2 is a flowchart showing a basic configuration of a gas supply / discharge system of a fuel cell main body according to a second embodiment of the fuel cell power generator of the present invention.
【図３】本発明の燃料電池発電装置の第３の実施例の燃
料電池本体のガス供給排出系の基本構成を示すフロー図FIG. 3 is a flowchart showing a basic configuration of a gas supply / discharge system of a fuel cell body according to a third embodiment of the fuel cell power generator of the present invention.
【図４】従来の燃料電池発電装置の燃料電池本体のガス
供給排出系の基本構成を示すフロー図FIG. 4 is a flowchart showing a basic configuration of a gas supply / discharge system of a fuel cell main body of a conventional fuel cell power generator.
１ 燃料電池本体 ２ エゼクタ ３ 遮断弁 ４ 遮断弁 ５ 圧力計 ６ 逆止め弁 ７ 絞り ８ 遮断弁 １０ 制御弁 １１ 燃料極供給配管 １２ 再循環回路 １３ ガス放出配管 １４ 空気極供給配管 １５ 空気極排出配管 １６ 窒素供給配管 １７ バイパス配管 １８ 破裂板 １９ 放圧配管 ２０ 原燃料流量計 ２１ 出力電流計 ２２ 演算装置 DESCRIPTION OF SYMBOLS 1 Fuel cell main body 2 Ejector 3 Shut-off valve 4 Shut-off valve 5 Pressure gauge 6 Check valve 7 Throttle 8 Shut-off valve 10 Control valve 11 Fuel electrode supply pipe 12 Recirculation circuit 13 Gas discharge pipe 14 Air electrode supply pipe 15 Air electrode discharge pipe 16 Nitrogen supply pipe 17 Bypass pipe 18 Rupture plate 19 Pressure release pipe 20 Raw fuel flow meter 21 Output ammeter 22 Arithmetic unit
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成９年５月２９日[Submission date] May 29, 1997
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００４[Correction target item name] 0004
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【０００４】[0004]
【発明が解決しようとする課題】燃料電池発電装置の運
転の停止時には、効果的にガス置換を行うために、大量
の窒素が供給される。したがって、上記のごとき構成の
ガス供給排出系においては、燃料極の出口より再循環回
路１２へと排出される排出ガス量が急激に増大し、これ
に伴ってガス放出配管１３より外部へと放出されるガス
量も増大することとなる。これに対して、ガス放出配管
１３には、通常運転時に放出されるガス量に対応して圧
力を制限する絞り７が備えられているので、放出される
ガス量が増大すると絞り７における圧力損失が急激に増
大する。このため、再循環回路１２の圧力、したがって
燃料極の圧力が上昇し、燃料極と空気極との間の差圧が
一時的に大きくなる。すなわち、ガス置換に用いられる
窒素ガスの供給元の圧力は、通常、約１×10 5 Pa 以上高
い圧力に保持されているのに対して、燃料電池本体１の
燃料極の耐圧力性能は１×10 4 Pa 程度であり、過大な圧
力が加わって燃料電池本体１が損傷する恐れがある。ま
た、ガス置換の時以外でも、例えば、負荷遮断に伴って
燃料極内部での水素消費量を抑えると、燃料極の出口よ
り排出される排出ガス量が急激に増大するので、ガス置
換の時と同様に燃料極の圧力が上昇し、燃料極と空気極
との間の差圧が一時的に大きくなる事態が生じ、極間で
のガス漏洩を引き起こし、燃料電池本体１が損傷する恐
れがある。When the operation of the fuel cell power generation device is stopped, a large amount of nitrogen is supplied to effectively perform gas replacement. Therefore, in the gas supply / discharge system configured as described above, the amount of exhaust gas discharged from the outlet of the fuel electrode to the recirculation circuit 12 sharply increases, and accordingly, the amount of gas discharged from the gas discharge pipe 13 to the outside is increased. The amount of gas used will also increase. On the other hand, the gas discharge pipe 13 is provided with the throttle 7 that limits the pressure in accordance with the amount of gas released during normal operation. Increase rapidly. For this reason, the pressure of the recirculation circuit 12, and thus the pressure of the fuel electrode, increases, and the pressure difference between the fuel electrode and the air electrode temporarily increases. That is, the pressure of the supply source of the nitrogen gas used for gas replacement is normally maintained at a pressure higher than about 1 × 10 5 Pa, while the pressure resistance performance of the fuel electrode of the fuel cell body 1 is 1 The pressure is about × 10 4 Pa, and there is a possibility that the fuel cell body 1 may be damaged due to excessive pressure. Further, even when the gas replacement is not performed, for example, if the amount of hydrogen consumed inside the fuel electrode is reduced due to load shedding, the amount of exhaust gas discharged from the outlet of the fuel electrode rapidly increases. Similarly, the pressure of the fuel electrode rises, and the pressure difference between the fuel electrode and the air electrode temporarily increases, causing gas leakage between the electrodes and possibly damaging the fuel cell body 1. is there.
フロントページの続き (72)発明者 三木 啓史 香川県高松市屋島西町2109番地８ 株式会 社四国総合研究所内 (72)発明者 横山 尚伸 神奈川県川崎市川崎区田辺新田１番１号 富士電機株式会社内 (72)発明者 大賀 俊輔 神奈川県川崎市川崎区田辺新田１番１号 富士電機株式会社内 (72)発明者 長谷川 雅一 神奈川県川崎市川崎区田辺新田１番１号 富士電機株式会社内Continued on the front page (72) Inventor Hiroshi Miki 2109-8 Yashimanishimachi, Takamatsu City, Kagawa Prefecture Inside Shikoku Research Institute, Inc. (72) Inventor Naonobu Yokoyama 1-1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Co., Ltd. Inside the company (72) Inventor Shunsuke Oga 1-1-1, Tanabe-Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (72) Inventor Masakazu Hasegawa 1-1-1, Tanabe-Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Inside the corporation
Claims (4)
スを再循環回路を通してエゼクタへと導き、外部より導
入される原燃料と混合して燃料極へ供給する燃料電池発
電装置において、再循環回路に、通流する排出ガスの圧
力を測定する圧力計と、逆止め弁と絞りとの直列接続体
を具備し排出ガスを外部へと放出するガス放出配管を備
え、かつ、前記圧力計の測定信号により開閉する遮断弁
を具備したバイパス配管を前記ガス放出配管に並列に備
えてなることを特徴とする燃料電池発電装置。An exhaust gas discharged from a fuel electrode of a fuel cell is led to an ejector through a recirculation circuit, mixed with raw fuel introduced from the outside, and supplied to the fuel electrode. The circuit includes a pressure gauge for measuring the pressure of the exhaust gas flowing therethrough, a gas discharge pipe that includes a series connection of a check valve and a throttle and discharges the exhaust gas to the outside, and A fuel cell power generator comprising a bypass pipe having a shut-off valve that opens and closes in response to a measurement signal, in parallel with the gas discharge pipe.
いて、前記のバイパス配管と並列に、破裂板または安全
弁よりなる放圧機構を具備した放圧配管を備えたことを
特徴とする燃料電池発電装置。2. The fuel cell power generator according to claim 1, further comprising a pressure release pipe provided with a pressure release mechanism comprising a rupturable plate or a safety valve, in parallel with the bypass pipe. Power generator.
いて、外部より導入される原燃料の供給量信号と発電装
置の出力電流信号を入力して原燃料供給量と燃料消費量
とを算出し、その差より前記放圧配管からのガス漏洩を
検知する演算装置を備えたことを特徴とする燃料電池発
電装置。3. The fuel cell power generator according to claim 2, wherein a raw fuel supply amount and a fuel consumption amount are calculated by inputting an externally supplied raw fuel supply amount signal and an output current signal of the power generation device. A fuel cell power generator comprising an arithmetic unit for detecting gas leakage from the pressure relief pipe based on the difference.
スを再循環回路を通してエゼクタへと導き、外部より導
入される原燃料と混合して燃料極へ供給する燃料電池発
電装置において、再循環回路に、通流する排出ガスの圧
力を測定する圧力計と、前記圧力計の測定信号により開
度が制御される制御弁と逆止め弁との直列接続体を具備
し排出ガスを外部へ放出するガス放出配管を備えてなる
ことを特徴とする燃料電池発電装置。4. In a fuel cell power generation device, exhaust gas discharged from a fuel electrode of a fuel cell is guided to an ejector through a recirculation circuit, mixed with raw fuel introduced from outside, and supplied to the fuel electrode. The circuit has a pressure gauge for measuring the pressure of the exhaust gas flowing therethrough, and a series connection of a control valve and a check valve whose degree of opening is controlled by a measurement signal of the pressure gauge, and discharges the exhaust gas to the outside. A fuel cell power generator, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9088217A JPH10284098A (en) | 1997-04-07 | 1997-04-07 | Fuel cell power generating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9088217A JPH10284098A (en) | 1997-04-07 | 1997-04-07 | Fuel cell power generating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10284098A true JPH10284098A (en) | 1998-10-23 |
Family
ID=13936737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9088217A Withdrawn JPH10284098A (en) | 1997-04-07 | 1997-04-07 | Fuel cell power generating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10284098A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003017101A (en) * | 2001-07-05 | 2003-01-17 | Honda Motor Co Ltd | Humidifying system for fuel cell |
| US7648787B2 (en) | 2004-11-29 | 2010-01-19 | Toyota Jidosha Kabushiki Kaisha | Gas leak detection device and fuel cell system |
| DE10251878C5 (en) * | 2001-11-09 | 2010-02-11 | Honda Giken Kogyo K.K. | Fuel cell system with a fuel cycle |
| KR100986473B1 (en) | 2008-03-14 | 2010-10-08 | 현대자동차주식회사 | Device for removing exhaust hydrogen of fuel cell system |
| DE102022206055A1 (en) | 2022-06-15 | 2023-12-21 | GLOBE Fuel Cell Systems GmbH | Fuel cell system |
-
1997
- 1997-04-07 JP JP9088217A patent/JPH10284098A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003017101A (en) * | 2001-07-05 | 2003-01-17 | Honda Motor Co Ltd | Humidifying system for fuel cell |
| DE10251878C5 (en) * | 2001-11-09 | 2010-02-11 | Honda Giken Kogyo K.K. | Fuel cell system with a fuel cycle |
| US7648787B2 (en) | 2004-11-29 | 2010-01-19 | Toyota Jidosha Kabushiki Kaisha | Gas leak detection device and fuel cell system |
| KR100986473B1 (en) | 2008-03-14 | 2010-10-08 | 현대자동차주식회사 | Device for removing exhaust hydrogen of fuel cell system |
| DE102022206055A1 (en) | 2022-06-15 | 2023-12-21 | GLOBE Fuel Cell Systems GmbH | Fuel cell system |
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