JPH07169478A - Cell cooling water system for fuel cell - Google Patents
Cell cooling water system for fuel cellInfo
- Publication number
- JPH07169478A JPH07169478A JP5313910A JP31391093A JPH07169478A JP H07169478 A JPH07169478 A JP H07169478A JP 5313910 A JP5313910 A JP 5313910A JP 31391093 A JP31391093 A JP 31391093A JP H07169478 A JPH07169478 A JP H07169478A
- Authority
- JP
- Japan
- Prior art keywords
- water
- cooling water
- fuel cell
- power generation
- battery cooling
- 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.)
- Pending
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
Landscapes
- Fuel Cell (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は燃料電池発電システムに
係り、特に水供給システムに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell power generation system, and more particularly to a water supply system.
【０００２】[0002]
【従来の技術】燃料電池発電システムは、都市ガス、プ
ロパンガスなどの燃料の有している化学エネルギーを電
気エネルギーに変換するもので、燃料電池本体および、
都市ガス、プロパンガスなどの燃料から水素を生成する
装置、燃料電池本体で発電される直流出力を交流に変換
する変換装置、燃料電池本体の動作や水素生成に適した
温度に作動ガスの温度を保つための熱交換器により構成
されている。燃料電池本体は、水素生成装置により生成
された水素ガスと、空気中の酸素の結合エネルギーを直
接電気に変換するが、その際発生した反応熱も取出され
る。2. Description of the Related Art A fuel cell power generation system converts chemical energy of a fuel such as city gas or propane gas into electric energy.
A device that generates hydrogen from fuel such as city gas or propane gas, a converter that converts the direct current output generated by the fuel cell main body to alternating current, and the temperature of the working gas to a temperature suitable for the operation of the fuel cell main body and hydrogen generation. It is composed of a heat exchanger for keeping. The fuel cell body directly converts the binding energy between hydrogen gas generated by the hydrogen generator and oxygen in the air into electricity, but the reaction heat generated at that time is also taken out.
【０００３】このように、燃料電池発電システムは、化
学反応による発電のため、発電効率が高く、また大気汚
染物質の排出が少なく、しかも騒音も小さいクリーンな
発電システムとして評価されている。As described above, the fuel cell power generation system is evaluated as a clean power generation system having high power generation efficiency, low emission of air pollutants, and low noise due to power generation by a chemical reaction.
【０００４】ところで、燃料電池本体の電気化学反応を
効率よく行なわせるためには、電池本体の温度を一定の
温度レベルに保つ必要があり、冷却水等で適切な温度に
冷却される。この冷却水系は気水分離器、ポンプ、熱交
換器等で構成され、熱交換器から取出される排熱は様々
な用途の熱利用がなされている。ここで、電池冷却水の
温度を一定かつ適温で保つためには、供給水の温度を制
御する必要がある。By the way, in order to efficiently carry out the electrochemical reaction of the fuel cell body, it is necessary to keep the temperature of the cell body at a constant temperature level, and the fuel cell body is cooled to an appropriate temperature. This cooling water system is composed of a steam separator, a pump, a heat exchanger, and the like, and exhaust heat extracted from the heat exchanger is used for various purposes. Here, in order to keep the temperature of the battery cooling water constant and at an appropriate temperature, it is necessary to control the temperature of the supply water.
【０００５】図３は、従来の燃料電池発電システムの構
成例を示すものである。図３に示すように、燃料極１
ａ、空気極１ｂ及び電池冷却器１ｃを備えた燃料電池本
体１で発生した反応熱を電池冷却器１ｃ内の電池冷却水
と熱交換させることで取出し、その電池冷却水は気液二
相流となって、気水分離器２に導入される。この気水分
離器２では気液二相流の流体２ａを蒸気と熱水に分離し
て冷却水２ｂとし、これを電池冷却水循環ポンプ５によ
り、電池冷却水温度調整用熱交換器６を通して冷却器１
ｃに導かれる。また、この電池冷却水温度調整用熱交換
器６の通過流量は、電池冷却水温度調節弁８によって制
御されている。FIG. 3 shows an example of the configuration of a conventional fuel cell power generation system. As shown in FIG. 3, the fuel electrode 1
a, the air electrode 1b and the battery cooler 1c are taken out by exchanging the reaction heat generated in the fuel cell main body 1 with the battery cooling water in the battery cooler 1c, and the battery cooling water is a gas-liquid two-phase flow. Then, it is introduced into the steam separator 2. In this steam separator 2, the fluid 2a of gas-liquid two-phase flow is separated into steam and hot water to form cooling water 2b, which is cooled by a battery cooling water circulation pump 5 through a battery cooling water temperature adjusting heat exchanger 6. Bowl 1
guided by c. The flow rate of the battery cooling water temperature adjusting heat exchanger 6 is controlled by the battery cooling water temperature adjusting valve 8.
【０００６】気水分離器で分離した蒸気は改質器の改質
反応に供されるため、電池冷却水系の水量は、システム
の運転に伴って減少する。これを補うため、系外より補
給水を供給する。補給水は通常、化学反応による発電過
程で生成される生成水が排ガスと共に排出されたものを
凝縮、回収し、これを処理して用いる。Since the steam separated by the steam separator is used for the reforming reaction of the reformer, the amount of water in the battery cooling water system decreases with the operation of the system. To compensate for this, makeup water is supplied from outside the system. The make-up water is usually used by condensing and recovering the produced water generated in the power generation process by the chemical reaction, which is discharged together with the exhaust gas, and treating this.
【０００７】[0007]
【発明が解決しようとする課題】このような構成の燃料
電池発電システムにおいては、一般的には水処理系供給
ポンプ４は、制御の簡素化のため間欠的に動作させ、補
給水を定量供給している。補給水の水温は約50〜60℃
で、電池冷却水系の水温より 100℃以上低い。このた
め、補給水をそのまま電池冷却水系に混合すると電池冷
却水系の水温低下を招くため、気水分離器に一度供給し
て、この影響を最小限にしている。しかしながら、経験
的には水処理系供給ポンプ４の作動によって、電池冷却
水系の水温が図４に示すように５〜10℃の幅で変動して
いることを確認している。この電池冷却水の水温が変化
すると電池入口の冷却水温度が変動するため、燃料電池
本体に悪影響を及ぼし、寿命の低下を招く。In the fuel cell power generation system having such a structure, generally, the water treatment system supply pump 4 is intermittently operated for simplification of control to supply a fixed amount of makeup water. is doing. Make-up water temperature is about 50-60 ℃
And, it is 100 ℃ or more lower than the water temperature of the battery cooling water system. For this reason, if the makeup water is directly mixed with the battery cooling water system, the water temperature of the battery cooling water system is lowered. Therefore, this effect is minimized by supplying it once to the steam separator. However, it has been empirically confirmed that the water temperature of the battery cooling water system fluctuates in a range of 5 to 10 ° C. as shown in FIG. 4 by the operation of the water treatment system supply pump 4. When the water temperature of the cell cooling water changes, the temperature of the cooling water at the cell inlet also fluctuates, which adversely affects the fuel cell main body and shortens the life.
【０００８】本発明は、安定した発電状態を得ることで
電池寿命を延ばし、かつ安価にて燃料電池本体の発電効
率を上げることができる燃料電池発電システムを提供す
ることを目的とする。An object of the present invention is to provide a fuel cell power generation system capable of extending the cell life by obtaining a stable power generation state and increasing the power generation efficiency of the fuel cell main body at low cost.
【０００９】[0009]
【課題を解決するための手段】本発明は上記の目的を達
成するため、燃料極、空気極および冷却器を備えた燃料
電池本体と、燃料を改質して生成された水素ガスを前記
燃料電池本体の燃料極に供給する燃料改質器と、前記燃
料電池本体の反応熱により加熱され二相流化した冷却水
を気相と水相に分離する気水分離器およびこの気水分離
器で分離された冷却水を前記燃料電池本体の冷却器を通
して循環させる電池冷却水循環ポンプにより構成された
電池冷却水系とを備えた燃料電池発電システムにおい
て、前記気水分離器内の電池冷却水の温度を一定に保つ
ために、水処理系供給ポンプの容量を従来より減少さ
せ、連続動作とし、また水処理再生熱交換器を設けるこ
とにより、電池冷却水を供給水の温度差を減少させ燃料
電池本体の発電効率を上昇させるものである。In order to achieve the above object, the present invention provides a fuel cell body having a fuel electrode, an air electrode, and a cooler, and hydrogen gas produced by reforming the fuel, which is used as the fuel. A fuel reformer for supplying to a fuel electrode of a cell body, a steam separator for separating cooling water heated by reaction heat of the fuel cell and converted into two phases into a gas phase and an aqueous phase, and the steam separator In a fuel cell power generation system including a battery cooling water system configured by a battery cooling water circulation pump that circulates the cooling water separated by the fuel cell body cooler, the temperature of the battery cooling water in the steam separator In order to keep the temperature constant, the capacity of the water treatment system supply pump is reduced compared to the conventional one to make it operate continuously, and the water treatment regeneration heat exchanger is installed to reduce the temperature difference of the supply water of the cell cooling water and the fuel cell. The power generation efficiency of the main body It is intended to rise.
【００１０】[0010]
【作用】このような構成の燃料電池発電システムにおい
て、水処理系供給ポンプの連続動作によりプラントの電
気的損失は多少発生するが、燃料電池本体の電気化学反
応を安定化させることができ、発電効率の向上につなが
る。すなわち、従来の比べて経済的に有利となる。In the fuel cell power generation system having such a structure, although some electrical loss occurs in the plant due to continuous operation of the water treatment system supply pump, it is possible to stabilize the electrochemical reaction of the fuel cell main body and generate power. It leads to improvement of efficiency. That is, it is economically advantageous as compared with the conventional one.
【００１１】また、気水分離器への供給水を水処理再生
熱交換器により電池冷却水と熱交換させることによっ
て、供給水と電池冷却水の温度差を減少させることがで
きるので、水タンク内の供給水の温度変化にも十分対応
できる。Further, the temperature difference between the supply water and the battery cooling water can be reduced by exchanging heat of the supply water to the steam separator with the battery cooling water by the water treatment regenerative heat exchanger. It can fully cope with the temperature change of the supply water inside.
【００１２】さらに、水処理再生熱交換器により電池冷
却水はある程度熱回収されるため、電池冷却水温度調整
用熱交換器による熱回収分が従来より低減され発電効率
の向上につながる。Further, since the battery cooling water is recovered to some extent by the water treatment regenerated heat exchanger, the amount of heat recovered by the battery cooling water temperature adjusting heat exchanger is reduced as compared with the conventional case, leading to an improvement in power generation efficiency.
【００１３】[0013]
【実施例】以下本発明の実施例を図面を参照して説明す
る。図１は本発明による燃料電池発電システムの一実施
例を示す構成図である。図１において、１は燃料極１
ａ、電気極１ｂ及び冷却器１ｃを備えた燃料電池本体で
この燃料電池本体１の燃料極１ａには、燃料を改質して
生成された水素ガスが供給され、その排ガスは冷却され
た後外部へ排気される。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of a fuel cell power generation system according to the present invention. In FIG. 1, 1 is a fuel electrode 1
In the fuel cell body including the a, the electric electrode 1b and the cooler 1c, the hydrogen gas produced by reforming the fuel is supplied to the fuel electrode 1a of the fuel cell body 1, and the exhaust gas thereof is cooled. Exhausted to the outside.
【００１４】そして、燃料電池本体１で発生した反応熱
は電池冷却器１ｃ内の電池冷却水と熱交換されることで
取出され、その二相流化した電池冷却水は、電池冷却水
電気ヒータ７を通して気水分離器２に導入される。この
気水分離器２で二相流化した電池冷却水を電池冷却水循
環ポンプ５により電池冷却水温度調整用熱交換器６に導
入し、電池冷却器１ｃに戻される電池冷却水系を構成し
ている。この電池冷却水温度調整用熱交換器６を通過す
る冷却水流量は、電池冷却水温度調節弁８によって制御
されている。The reaction heat generated in the fuel cell body 1 is taken out by heat exchange with the cell cooling water in the cell cooler 1c, and the two-phase flow of the cell cooling water is the cell cooling water electric heater. It is introduced into the steam separator 2 through 7. The battery cooling water that has been made into a two-phase flow by the steam separator 2 is introduced into the battery cooling water temperature adjusting heat exchanger 6 by the battery cooling water circulation pump 5, and the battery cooling water system is returned to the battery cooling device 1c. There is. The flow rate of the cooling water passing through the battery cooling water temperature adjusting heat exchanger 6 is controlled by the battery cooling water temperature control valve 8.
【００１５】また、水タンク３から気水分離器２への補
給水は、水処理系供給ポンプ４によって供給される。こ
の実施例は、水処理系供給ポンプ４を連続動作とし、気
水分離器２にレベルスイッチ10を設け、気水分離器２の
水量を気水分離器レベル制御弁９によって制御するもの
である。The make-up water from the water tank 3 to the steam separator 2 is supplied by the water treatment system supply pump 4. In this embodiment, the water treatment system supply pump 4 is operated continuously, a level switch 10 is provided in the steam separator 2, and the amount of water in the steam separator 2 is controlled by a steam separator level control valve 9. .
【００１６】図２は本発明による燃料電池発電システム
の他の実施例を示す構成図である。図２は図１の燃料電
池発電システムに水処理再生熱交換器11を付加したもの
である。この水処理再生熱交換器11は電池冷却水温度調
整用熱交換器６の上流側に設けられ、気水分離器２への
補給水と電池冷却水とを熱交換させることにより、電池
冷却水の温度変動を減少させ、さらに電池冷却水温度調
整用熱交換器６による熱回収分も従来より低減させるも
のである。FIG. 2 is a block diagram showing another embodiment of the fuel cell power generation system according to the present invention. FIG. 2 shows the fuel cell power generation system of FIG. 1 with a water treatment regenerative heat exchanger 11 added. The water treatment regenerated heat exchanger 11 is provided on the upstream side of the battery cooling water temperature adjusting heat exchanger 6 and heat-exchanges the make-up water to the steam separator 2 with the battery cooling water to thereby obtain the battery cooling water. The temperature fluctuation of No. 1 is reduced, and the amount of heat recovered by the battery cooling water temperature adjusting heat exchanger 6 is also reduced as compared with the conventional case.
【００１７】[0017]
【発明の効果】以上述べたように本発明によれば、水処
理系供給ポンプの連続動作、かつ水処理再生熱交換器を
利用することにより、電池冷却水の過渡的な温度変動を
少なくすることができるので、燃料電池本体の発電効率
を上昇させ、電池寿命を延ばすことができる安定した燃
料電池発電システムを提供できる。As described above, according to the present invention, the continuous operation of the water treatment system supply pump and the use of the water treatment regenerated heat exchanger reduce the transient temperature fluctuation of the battery cooling water. Therefore, it is possible to provide a stable fuel cell power generation system capable of increasing the power generation efficiency of the fuel cell main body and extending the cell life.
【図１】本発明による燃料電池発電システムの一実施例
を示す構成図FIG. 1 is a configuration diagram showing an embodiment of a fuel cell power generation system according to the present invention.
【図２】本発明による燃料電池発電システムの異なる実
施例を示す構成図FIG. 2 is a configuration diagram showing a different embodiment of the fuel cell power generation system according to the present invention.
【図３】従来の燃料電池発電システムの一例を示す構成
図FIG. 3 is a configuration diagram showing an example of a conventional fuel cell power generation system.
【図４】従来の燃料電池の電池冷却水温度と水処理系供
給ポンプの動作との関係を表わす図FIG. 4 is a diagram showing the relationship between the cell cooling water temperature of a conventional fuel cell and the operation of a water treatment system supply pump.
１…燃料電池本体、 １ａ…燃料極、 １ｂ…空気極、 １ｃ…冷却器、 ２…気水分離器、 ２ａ…電池冷却水系発生蒸気、 ２ｂ…電池冷却水、 ３…水タンク、 ３ａ…水処理系発生蒸気、 ３ｂ…回収水及び供給水、 ４…水処理系供給ポンプ、 ５…電池冷却水循環ポンプ、 ６…電池冷却水温度調整用熱交換器、 ７…電池冷却水電気ヒータ、 ８…電池冷却水温度調節弁、 ９…気水分離器レベル制御弁、 10…気水分離器レベルスイッチ、 11…水処理再生熱交換器。 DESCRIPTION OF SYMBOLS 1 ... Fuel cell main body, 1a ... Fuel electrode, 1b ... Air electrode, 1c ... Cooler, 2 ... Steam separator, 2a ... Battery cooling water system generated steam, 2b ... Battery cooling water, 3 ... Water tank, 3a ... Water Treatment system generated steam, 3b ... Recovered water and supply water, 4 ... Water treatment system supply pump, 5 ... Battery cooling water circulation pump, 6 ... Battery cooling water temperature adjusting heat exchanger, 7 ... Battery cooling water electric heater, 8 ... Battery cooling water temperature control valve, 9 ... Steam / water separator level control valve, 10 ... Steam / water separator level switch, 11 ... Water treatment regeneration heat exchanger.
Claims (2)
する燃料供給系、空気供給系、電池冷却水系、排ガス・
水分回収系、水処理系及びその付属装置とからなる燃料
電池発電システムにおいて、前記電池冷却水系、気水分
離器の水位を制御する給水ポンプを連続運転にすること
により、電池冷却水の温度変動を少なくすることを特徴
とする燃料電池発電システム。1. A fuel cell main body, and a fuel supply system, an air supply system, a cell cooling water system, an exhaust gas for the fuel cell main body,
In a fuel cell power generation system consisting of a water recovery system, a water treatment system, and its ancillary equipment, the temperature of the cell cooling water is fluctuated by continuously operating the water supply pump that controls the water level of the cell cooling water system and the water / water separator. Fuel cell power generation system characterized by reducing
ンプの下流に電池冷却水との熱交換器を設け、気水分離
器への供給水温度を電池冷却水温度で制御し、かつ、２
次冷却水系の熱回収分を減少させることを特徴とする請
求項１に記載の燃料電池発電システム。2. The heat exchanger for battery cooling water is provided downstream of the water supply pump according to claim 1, the temperature of water supplied to the steam separator is controlled by the temperature of battery cooling water, and Two
The fuel cell power generation system according to claim 1, wherein the heat recovery of the secondary cooling water system is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5313910A JPH07169478A (en) | 1993-12-15 | 1993-12-15 | Cell cooling water system for fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5313910A JPH07169478A (en) | 1993-12-15 | 1993-12-15 | Cell cooling water system for fuel cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07169478A true JPH07169478A (en) | 1995-07-04 |
Family
ID=18046997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5313910A Pending JPH07169478A (en) | 1993-12-15 | 1993-12-15 | Cell cooling water system for fuel cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07169478A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009170307A (en) * | 2008-01-17 | 2009-07-30 | Nippon Oil Corp | Fuel cell module, and operation method of fuel cell module |
| KR102168782B1 (en) * | 2020-08-07 | 2020-10-22 | 에너플러스(주) | Temperature optimizing system of hydrogen fuel cell |
-
1993
- 1993-12-15 JP JP5313910A patent/JPH07169478A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009170307A (en) * | 2008-01-17 | 2009-07-30 | Nippon Oil Corp | Fuel cell module, and operation method of fuel cell module |
| KR102168782B1 (en) * | 2020-08-07 | 2020-10-22 | 에너플러스(주) | Temperature optimizing system of hydrogen fuel cell |
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| JPH06103996A (en) | Fuel cell power generating exhaust heat recovery system | |
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