JPH08335464A - Water supply method to fuel cell cooling water line - Google Patents
Water supply method to fuel cell cooling water lineInfo
- Publication number
- JPH08335464A JPH08335464A JP7141617A JP14161795A JPH08335464A JP H08335464 A JPH08335464 A JP H08335464A JP 7141617 A JP7141617 A JP 7141617A JP 14161795 A JP14161795 A JP 14161795A JP H08335464 A JPH08335464 A JP H08335464A
- Authority
- JP
- Japan
- Prior art keywords
- water supply
- water
- cooling water
- fuel cell
- piping
- 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.)
- Granted
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]
【産業上の利用分野】本発明は、水蒸気分離器及び冷却
水ポンプが介装されている燃料電池冷却水系の配管に、
給水ポンプ及び給水弁が介装された給水系の配管が合流
しており、前記水蒸気分離器のレベルセンサからの信号
に基づき前記給水弁を開放して給水系から冷却水系へ給
水する燃料電池冷却水系への給水方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell cooling water system pipe in which a steam separator and a cooling water pump are installed.
A fuel cell cooling system in which a water supply system piping in which a water supply pump and a water supply valve are interposed joins, and the water supply valve is opened based on a signal from a level sensor of the water vapor separator to supply water from the water supply system to a cooling water system. Regarding water supply method to water system.
【０００２】[0002]
【従来の技術】図１は本発明の実施例を示す図面である
が、このうち公知部分について本願の発明をよく理解す
るために説明する。2. Description of the Related Art FIG. 1 is a diagram showing an embodiment of the present invention, of which known portions will be described for better understanding of the present invention.
【０００３】図１において、全体を符号１で示す燃料電
池発電装置の水蒸気分離器２は、配管Ｌ１により冷却水
ポンプ３を介して燃料電池４の入口側に接続されてい
る。その燃料電池４の出口側は、配管Ｌ２と配管Ｌ３と
を介して水蒸気分離器２に接続され、この配管Ｌ３に
は、三方弁５と外部冷却水による冷却器６とが介装され
ている。配管Ｌ１、配管Ｌ２（図１において点線で示す
配管）及び配管Ｌ３により冷却水系が構成されている。In FIG. 1, a steam separator 2 of the fuel cell power generator, which is generally designated by reference numeral 1, is connected to an inlet side of a fuel cell 4 via a cooling water pump 3 by a pipe L1. The outlet side of the fuel cell 4 is connected to the water vapor separator 2 via a pipe L2 and a pipe L3, and the pipe L3 is provided with a three-way valve 5 and a cooler 6 using external cooling water. . A pipe L1, a pipe L2 (pipe shown by a dotted line in FIG. 1) and a pipe L3 constitute a cooling water system.
【０００４】また、配管Ｌ１の水蒸気分離器２と冷却水
ポンプ３との間には、給水配管Ｌ４が接続されている。
その配管Ｌ４には、電磁開閉弁の給水弁７と給水ポンプ
８とが設けられ、それぞれ制御盤９に接続されている。
そして、制御盤９には水蒸気分離器２に設けられたレベ
ルセンサ１０が接続されている。なお、冷却器６は、水
蒸気分離器２内の圧力を一定にするためのものである。
また、符号ＳＳは水蒸気改質用蒸気であり、冷却水の系
外へ取り出されている。そして、符号Ｂはブローダウン
水である。A water supply pipe L4 is connected between the water vapor separator 2 and the cooling water pump 3 in the pipe L1.
The pipe L4 is provided with a water supply valve 7 and a water supply pump 8 which are electromagnetic on-off valves, and are connected to a control panel 9, respectively.
A level sensor 10 provided in the water vapor separator 2 is connected to the control panel 9. The cooler 6 is for keeping the pressure in the steam separator 2 constant.
Reference numeral SS is steam for steam reforming, which is taken out of the cooling water system. And the code | symbol B is blowdown water.
【０００５】レベルセンサ１０は水蒸気分離器２内の冷
却水Ｗが所定のローレベル（最低水位）以下になると、
ローレベル信号を制御盤９に出力する。すると制御盤９
は、図２のモードＡに示す様に、所定時間Ｔ１（例えば
４分）だけ給水弁７を開放し且つ給水ポンプ８を作動し
て、給水配管Ｌ４から配管Ｌ１に給水する。（但し、給
水ポンプ８が常時運転の場合も存在する。）その際、給
水温度は配管Ｌ１〜Ｌ３の内部温度よりも遥かに低温な
ので、冷却水系の温度が低下して圧力が降下するが、燃
料電池発電装置１内の燃料電池４から水蒸気分離器２ま
での配管Ｌ２及びＬ３の長さは比較的短いので、冷却水
系或いは水蒸気分離器２の圧力変動は無視できる程度に
小さい。The level sensor 10 detects when the cooling water W in the water vapor separator 2 falls below a predetermined low level (minimum water level).
A low level signal is output to the control panel 9. Then the control panel 9
As shown in the mode A of FIG. 2, the water supply valve 7 is opened for a predetermined time T1 (for example, 4 minutes) and the water supply pump 8 is operated to supply water from the water supply pipe L4 to the pipe L1. (However, there is a case where the water supply pump 8 is always operating.) At that time, since the temperature of the water supply is much lower than the internal temperature of the pipes L1 to L3, the temperature of the cooling water system drops and the pressure drops, Since the lengths of the pipes L2 and L3 from the fuel cell 4 to the water vapor separator 2 in the fuel cell power generator 1 are relatively short, the pressure fluctuation of the cooling water system or the water vapor separator 2 is negligibly small.
【０００６】[0006]
【発明が解決しようとする課題】ここで、近年、省エネ
ルギの見地から、燃料電池４により加熱された冷却水が
保有する熱量を有効利用したいという要請が存在する。
そのため、図１において点線で示す配管Ｌ２に代えて、
図１において実線で示す配管ＬＬを用いて、該配管ＬＬ
に熱交換器の様に配管中の冷却水が保有する熱を奪って
外部で利用するための機器を介装することが行われてい
る。Here, in recent years, from the viewpoint of energy saving, there is a demand for effectively utilizing the heat quantity of the cooling water heated by the fuel cell 4.
Therefore, instead of the pipe L2 shown by the dotted line in FIG.
Using the pipe LL indicated by the solid line in FIG.
In addition, a device such as a heat exchanger for removing the heat of the cooling water in the pipe and using it externally is installed.
【０００７】しかし、燃料電池４の下流側から水蒸気分
離器２までの配管ＬＬ及びＬ３が長くなり、配管容積が
大きくなるため、図２中のモードＢで示す様に、給水ポ
ンプ８を作動し且つ給水弁７を開放している時間すなわ
ち所定時間Ｔ２（例えば２０分）が上記所定時間Ｔ１に
比較して長くなる。そして、水蒸気分離器２の圧力が大
きく変動（降下）してしまうことが判明した。However, since the pipes LL and L3 from the downstream side of the fuel cell 4 to the water vapor separator 2 become long and the pipe volume becomes large, the water feed pump 8 is operated as shown in the mode B in FIG. Moreover, the time during which the water supply valve 7 is opened, that is, the predetermined time T2 (for example, 20 minutes) becomes longer than the predetermined time T1. Then, it was found that the pressure of the water vapor separator 2 largely fluctuates (falls).
【０００８】これは、従来の冷却水系が短いものでは、
燃料電池４の下流側の配管Ｌ１及びＬ２に存在する蒸気
量が少なく、給水による蒸気の凝縮に起因する圧力降下
は小さいためであり、しかし、配管Ｌ１及びＬ３が長い
場合には配管中の蒸気量が多く、給水による蒸気の凝縮
に起因する圧力降下が大きくなるためである。例えば給
水時において、配管Ｌ２を流れる場合には０．２ｋｇｆ
／ｃｍ2 程度の圧力降下で済むが、配管ＬＬを流れる場
合は１．０ｋｇｆ／ｃｍ2 程度の圧力降下が発生する。This is because the conventional cooling water system is short,
This is because the amount of steam existing in the pipes L1 and L2 on the downstream side of the fuel cell 4 is small and the pressure drop due to the condensation of the steam due to the water supply is small. However, when the pipes L1 and L3 are long, the steam in the pipes is small. This is because the amount is large and the pressure drop due to the condensation of steam due to water supply is large. For example, at the time of water supply, when flowing through the pipe L2, 0.2 kgf
Although a pressure drop of about / cm 2 is sufficient, a pressure drop of about 1.0 kgf / cm 2 occurs when flowing through the pipe LL.
【０００９】さらに、冷却水系においては、冷却水の温
度変化が小さくても、圧力変動は非常に大きくなる。こ
こで、配管ＬＬを用いた場合には冷却水系の配管の容積
も大きくなるため給水弁７を開放してから、水蒸気分離
器の水位レベルが上昇するまでに時間がかかる。給水量
（すなわち給水弁７を開放してから、給水弁７を閉鎖す
るまでの時間）は水蒸気分離器２の水位レベルで制御す
るため、配管ＬＬを使用して冷却水系の配管長さが長く
なると、給水量が多くなる。そして、給水の温度は冷却
水温度に比較して低温であるため、給水量が多くなれば
冷却水系の温度が更に低下して圧力の降下量が大きくな
り、水蒸気分離器２の圧力変動が大きくなるのである。Further, in the cooling water system, even if the temperature change of the cooling water is small, the pressure fluctuation becomes very large. Here, when the pipe LL is used, the volume of the pipe of the cooling water system also becomes large, and therefore it takes time after the water supply valve 7 is opened until the water level of the water vapor separator rises. Since the amount of water supplied (that is, the time from opening the water supply valve 7 to closing the water supply valve 7) is controlled by the water level of the steam separator 2, the pipe LL is used to increase the length of the cooling water system. Then, the amount of water supply will increase. Since the temperature of the water supply is lower than the temperature of the cooling water, the temperature of the cooling water system further decreases and the amount of pressure drop increases as the amount of water supply increases, resulting in large pressure fluctuations in the steam separator 2. It will be.
【００１０】本発明は、燃料電池下流側から水蒸気分離
器に至る配管の長さが非常に長く、或いは、その様な長
い配管に冷却水の熱を奪う機器が介装されている場合に
おける上述した様な多大な圧力降下を防止することが出
来る燃料電池冷却水系への給水方法を提供することを目
的としている。According to the present invention, the length of the pipe from the downstream side of the fuel cell to the water vapor separator is very long, or such a long pipe is provided with a device for absorbing heat of cooling water. It is an object of the present invention to provide a method of supplying water to a fuel cell cooling water system that can prevent such a large pressure drop.
【００１１】[0011]
【課題を解決するための手段】本発明の燃料電池冷却水
系への給水方法は、水蒸気分離器及び冷却水ポンプが介
装されている燃料電池冷却水系の配管に、給水ポンプ及
び給水弁が介装された給水系の配管が合流しており、前
記水蒸気分離器のレベルセンサからの信号に基づき前記
給水弁を開放して給水系から冷却水系へ給水する燃料電
池冷却水系への給水方法において、給水時に前記給水弁
の開放と閉鎖を繰り返して給水する。A method of supplying water to a fuel cell cooling water system according to the present invention includes a water supply pump and a water supply valve in a pipe of a fuel cell cooling water system in which a steam separator and a cooling water pump are provided. In the water supply method to the fuel cell cooling water system, the pipes of the installed water supply system are joined, and the water supply valve is opened based on a signal from the level sensor of the water vapor separator to supply water from the water supply system to the cooling water system. When water is supplied, the water supply valve is repeatedly opened and closed to supply water.
【００１２】ここで本発明は、前記冷却水系の前記燃料
電池の下流側に、冷却水から熱を奪う機器が介装されて
いる場合に適用されるのが好ましい。The present invention is preferably applied to a case where a device that removes heat from the cooling water is provided downstream of the fuel cell in the cooling water system.
【００１３】また、給水弁の開放（或いは、給水弁の開
放及び給水ポンプの作動）から閉鎖（或いは、給水弁の
閉鎖及び給水ポンプの停止）までの時間は、３秒以上２
分以下が好ましい。The time from opening the water supply valve (or opening the water supply valve and operating the water supply pump) to closing (or closing the water supply valve and stopping the water supply pump) is 3 seconds or more 2
Minutes or less are preferable.
【００１４】[0014]
【作用】上記のように構成された燃料電池冷却水系への
給水方法においては、給水弁の開放（或いは、給水弁の
開放及び給水ポンプの作動）から閉鎖（或いは、給水弁
の閉鎖及び給水ポンプの停止）とを断続的に繰り返して
給水を行うことにより、各給水時の圧力降下は無視でき
る程度に小さくなり、冷却水系の圧力変動が小さく抑え
られる。In the water supply method for the fuel cell cooling water system configured as described above, the water supply valve is opened (or the water supply valve is opened and the water supply pump is operated) to closed (or the water supply valve is closed and the water supply pump is closed). The water pressure is reduced to a negligible level by supplying water repeatedly by intermittently repeating (stopping) and water supply), and the pressure fluctuation of the cooling water system is suppressed to a small level.
【００１５】ここで、給水弁の開放（或いは、給水弁の
開放及び給水ポンプの作動）から閉鎖（或いは、給水弁
の閉鎖及び給水ポンプの停止）までの時間が２分より長
いと、従来の配管が長い場合と同様であり、圧力降下が
大きくなってしまう。一方、当該時間が３秒未満であれ
ば、給水弁が疲労して、その寿命が短縮されてしまう可
能性がある。また、給水ポンプの作動、停止を繰り返す
場合には、前記時間が３秒未満であると、給水ポンプの
作動、停止が短時間に何度も繰り返されることになるの
で、不都合である。If the time from opening the water supply valve (or opening the water supply valve and operating the water supply pump) to closing it (or closing the water supply valve and stopping the water supply pump) is longer than 2 minutes, the conventional This is the same as when the piping is long and the pressure drop becomes large. On the other hand, if the time is less than 3 seconds, the water supply valve may be fatigued and its life may be shortened. Further, when the operation and stop of the water supply pump are repeated, if the time is less than 3 seconds, the operation and stop of the water supply pump will be repeated many times in a short time, which is inconvenient.
【００１６】[0016]
【実施例】以下図面を参照して本発明の実施例を説明す
る。Embodiments of the present invention will be described below with reference to the drawings.
【００１７】燃料電池４の下流側と配管Ｌ３とは、燃料
電池発電装置１の外部に延びる非常に長い配管ＬＬで接
続されている。この配管ＬＬには、熱を奪う機器を介装
することができるが、図１ではその様な機器は示されて
いない。The downstream side of the fuel cell 4 and the pipe L3 are connected by a very long pipe LL extending to the outside of the fuel cell power generator 1. A device that removes heat can be interposed in the pipe LL, but such a device is not shown in FIG. 1.
【００１８】レベルセンサ１０が水蒸気分離器２内の冷
却水がローレベルまで下がると、制御盤９にローレベル
信号を出力する。すると、制御盤９は給水ポンプ８及び
給水弁７を、図２のモードＣに示すように、時間Ｔ３
（例えば８分）に亘り、給水弁７の開放及び給水ポンプ
８の作動と、給水弁７の閉鎖及び給水ポンプ８の停止と
を断続的に繰り返す。ここで、給水弁７の開放及び給水
ポンプ８の作動と、給水弁７の閉鎖及び給水ポンプ８の
停止との間隔は、３秒以上で、２分以下に設定されてい
る。The level sensor 10 outputs a low level signal to the control panel 9 when the cooling water in the steam separator 2 has dropped to a low level. Then, the control panel 9 sets the water supply pump 8 and the water supply valve 7 to the time T3 as shown in the mode C of FIG.
Over (for example, 8 minutes), the opening of the water supply valve 7 and the operation of the water supply pump 8 and the closing of the water supply valve 7 and the stop of the water supply pump 8 are repeated intermittently. Here, the interval between the opening of the water supply valve 7 and the operation of the water supply pump 8 and the closing of the water supply valve 7 and the stop of the water supply pump 8 is set to 3 seconds or more and 2 minutes or less.
【００１９】この様に給水弁７の開放と閉鎖を断続的に
繰り返せば、給水弁７が開放している１回の期間毎の給
水量は、図２のモードＢで示す場合に比較して遥かに小
量である。従って、配管ＬＬ及びＬ３内の冷却水におけ
る温度降下は少なく、圧力降下は無視できる程度に小さ
くなる。その結果、時間Ｔ３内の給水による水蒸気分離
器２の圧力変動は小さく抑えられる。If the opening and closing of the water supply valve 7 are repeated intermittently in this manner, the amount of water supply for each period during which the water supply valve 7 is open is larger than that in the case of mode B in FIG. It is a much smaller amount. Therefore, the temperature drop in the cooling water in the pipes LL and L3 is small, and the pressure drop is negligibly small. As a result, the pressure fluctuation of the steam separator 2 due to the water supply within the time T3 can be suppressed to be small.
【００２０】[0020]
【発明の効果】以上説明した様に、本発明によれば、燃
料電池下流側から水蒸気分離器に至る配管の長さが非常
に長い場合や、当該配管に冷却水の熱を奪う機器を介装
した場合において、給水時における冷却水系の圧力変動
を極めて小さく抑えることができるのである。As described above, according to the present invention, when the length of the pipe extending from the downstream side of the fuel cell to the water vapor separator is very long, or when the pipe absorbs heat of cooling water, When equipped, the pressure fluctuation of the cooling water system during water supply can be suppressed to an extremely small level.
【図１】本発明が実施される燃料電池発電装置を示す全
体構成図。FIG. 1 is an overall configuration diagram showing a fuel cell power generator in which the present invention is implemented.
【図２】本発明の効果を従来方法と比較して示すＯＮ−
ＯＦＦ制御のモード図。FIG. 2 shows the effect of the present invention in comparison with the conventional method.
Mode diagram of OFF control.
Ｌ１、Ｌ２、Ｌ３、Ｌ３Ａ、ＬＬ・・・配管 Ｌ４・・・給水配管 １・・・燃料電池発電装置 ２・・・水蒸気分離器 ３・・・冷却水ポンプ ４・・・燃料電池 ５・・・三方弁 ６・・・冷却器 ７・・・給水弁 ８・・・給水ポンプ ９・・・制御盤 １０・・・レベルセンサ L1, L2, L3, L3A, LL ... Piping L4 ... Water supply piping 1 ... Fuel cell power generator 2 ... Steam separator 3 ... Cooling water pump 4 ... Fuel cell 5 ...・ Three-way valve 6 ・ ・ ・ Cooler 7 ・ ・ ・ Water supply valve 8 ・ ・ ・ Water supply pump 9 ・ ・ ・ Control panel 10 ・ ・ ・ Level sensor
Claims (2)
れている燃料電池冷却水系の配管に、給水ポンプ及び給
水弁が介装された給水系の配管が合流しており、前記水
蒸気分離器のレベルセンサからの信号に基づき前記給水
弁を開放して給水系から冷却水系へ給水する燃料電池冷
却水系への給水方法において、給水時に前記給水弁の開
放と閉鎖を繰り返して給水することを特徴とする燃料電
池冷却水系への給水方法。1. A water supply system pipe having a water supply pump and a water supply valve is joined to a fuel cell cooling water system pipe having a water vapor separator and a cooling water pump. In the method of supplying water to the fuel cell cooling water system, in which the water supply valve is opened based on a signal from the level sensor to supply water from the water supply system to the cooling water system, the water supply valve is repeatedly opened and closed to supply water. Water supply method to the fuel cell cooling water system.
に、冷却水から熱を奪う機器が介装されている請求項１
の燃料電池冷却水系への給水方法。2. A device for removing heat from cooling water is provided downstream of the fuel cell in the cooling water system.
Water supply method to the fuel cell cooling water system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14161795A JP3503843B2 (en) | 1995-06-08 | 1995-06-08 | Water supply method to fuel cell cooling water system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14161795A JP3503843B2 (en) | 1995-06-08 | 1995-06-08 | Water supply method to fuel cell cooling water system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08335464A true JPH08335464A (en) | 1996-12-17 |
| JP3503843B2 JP3503843B2 (en) | 2004-03-08 |
Family
ID=15296211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14161795A Expired - Fee Related JP3503843B2 (en) | 1995-06-08 | 1995-06-08 | Water supply method to fuel cell cooling water system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3503843B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002064307A1 (en) * | 2001-02-13 | 2002-08-22 | Makino Milling Machine Co., Ltd. | Machine tool with thermal deformation suppressing function |
| CN103574124A (en) * | 2012-07-31 | 2014-02-12 | 金东纸业（江苏）股份有限公司 | Valve drainage control system and valve drainage control method |
-
1995
- 1995-06-08 JP JP14161795A patent/JP3503843B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002064307A1 (en) * | 2001-02-13 | 2002-08-22 | Makino Milling Machine Co., Ltd. | Machine tool with thermal deformation suppressing function |
| US6923603B2 (en) | 2001-02-13 | 2005-08-02 | Makino Milling Machine Co., Ltd | Machine tool with a feature for preventing a thermal deformation |
| CN103574124A (en) * | 2012-07-31 | 2014-02-12 | 金东纸业（江苏）股份有限公司 | Valve drainage control system and valve drainage control method |
| CN103574124B (en) * | 2012-07-31 | 2015-12-09 | 金东纸业（江苏）股份有限公司 | control valve drainage system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3503843B2 (en) | 2004-03-08 |
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