JP5251312B2 - Fuel cell system - Google Patents

Fuel cell system Download PDF

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JP5251312B2
JP5251312B2 JP2008178831A JP2008178831A JP5251312B2 JP 5251312 B2 JP5251312 B2 JP 5251312B2 JP 2008178831 A JP2008178831 A JP 2008178831A JP 2008178831 A JP2008178831 A JP 2008178831A JP 5251312 B2 JP5251312 B2 JP 5251312B2
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fuel cell
water
cylindrical filter
water tank
water supply
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JP2010020958A (en
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博美 山本
宏明 藤井
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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    • 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

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Description

本発明は、固体高分子形燃料電池を用いて発電を行う燃料電池システムに関するものである。   The present invention relates to a fuel cell system that generates power using a polymer electrolyte fuel cell.

従来の燃料電池システムについて、図４を用いて説明する。   A conventional fuel cell system will be described with reference to FIG.

従来の燃料電池システムは、燃料電池１を冷却する冷却水を貯める冷却水タンク２と、燃料電池１より排出される排気燃料ガスおよび排気酸化剤ガスを凝縮器３，４で凝縮した凝縮水を貯めるとともに、大気に開放された凝縮水タンク５と、この凝縮水タンク５内の水位を一定に保持するフロートスイッチ６と、このフロートスイッチ５の外周を囲むように設けた筒形フイルタ７と、凝縮水タンク５内の水を冷却水タンク２に供給する水供給ポンプ８を設けた水供給路９と、この水供給ポンプ８の上流側の水供給路９に設けたポンプフイルタ１０を具備していた（例えば、特許文献１、特許文献２参照）。
特開２００３−２５７４６５号公報 特開昭６０−１２４３６５号公報 The conventional fuel cell system includes a cooling water tank 2 for storing cooling water for cooling the fuel cell 1, and condensed water obtained by condensing exhaust fuel gas and exhaust oxidant gas discharged from the fuel cell 1 in the condensers 3 and 4. A condensate water tank 5 which is stored and opened to the atmosphere, a float switch 6 which keeps the water level in the condensate water tank 5 constant, a cylindrical filter 7 provided so as to surround the outer periphery of the float switch 5, A water supply passage 9 provided with a water supply pump 8 for supplying water in the condensed water tank 5 to the cooling water tank 2 and a pump filter 10 provided in the water supply passage 9 upstream of the water supply pump 8 are provided. (For example, refer to Patent Document 1 and Patent Document 2).
JP 2003-257465 A JP 60-124365 A

しかしながら、上記従来の構成では、筒形フイルタ７とポンプフイルタ１０とがあって構造が複雑でコスト高となり更にはメンテナンスもしにくいものであった。特にポンプフイルタ１０のメンテナンス時に凝縮水タンク５内の水が流出する課題もあった。   However, in the above-described conventional configuration, the cylindrical filter 7 and the pump filter 10 are provided, the structure is complicated, the cost is high, and maintenance is difficult. In particular, there is also a problem that water in the condensed water tank 5 flows out during maintenance of the pump filter 10.

本発明は、構造を簡素化してコスト低減を図りかつメンテナンスも容易にすることを目的とするものである。   An object of the present invention is to simplify the structure, reduce costs, and facilitate maintenance.

上記従来の課題を解決するために、本発明は、燃料電池より排出される排気燃料ガスおよび排気酸化剤ガスを凝縮した凝縮水を貯める大気に開放された凝縮水タンクと、この凝縮水タンク内の水位を一定に保持するフロートスイッチと、前記凝縮水タンク内の水を前
記冷却水タンクに供給する水供給ポンプを設けた水供給路とを具備し、前記フロートスイッチの外周を囲むように筒形フイルタを設け、この筒形フイルタの下方の出口部と前記水供給路の入口部とを連通させ、前記筒形フィルタをメンテナンスする場合は前記筒形フィルタと前記フロートスイッチとを一体にして上方に取り外せるように構成されているものである。
In order to solve the above-described conventional problems, the present invention provides a condensed water tank opened to the atmosphere for storing condensed water obtained by condensing exhaust fuel gas and exhaust oxidant gas discharged from a fuel cell, and the inside of the condensed water tank. And a water supply path provided with a water supply pump for supplying water in the condensate water tank to the cooling water tank, and a cylinder so as to surround the outer periphery of the float switch When a cylindrical filter is provided, the outlet part below the cylindrical filter communicates with the inlet part of the water supply passage, and when the cylindrical filter is to be maintained, the cylindrical filter and the float switch are integrated into the upper part. It is configured to be removable .

これにより、凝縮水タンクの構造を簡素化でき、そのためコスト低減が図れ、かつメンテナンスも容易にすることができる。   Thereby, the structure of the condensed water tank can be simplified, so that the cost can be reduced and the maintenance can be facilitated.

本発明の燃料電池システムによれば、凝縮水タンクの構造を簡素化でき、そのためコスト低減が図れ、かつメンテナンスも容易にすることができる。   According to the fuel cell system of the present invention, the structure of the condensed water tank can be simplified, so that the cost can be reduced and the maintenance can be facilitated.

第１の発明は、燃料ガスと酸化剤ガスを用いて発電を行う固体高分子形の燃料電池と、この燃料電池を冷却する冷却水を貯める冷却水タンクと、燃料電池より排出される排気燃料ガスおよび排気酸化剤ガスを凝縮した凝縮水を貯める大気に開放された凝縮水タンクと、この凝縮水タンク内の水位を一定に保持するフロートスイッチと、凝縮水タンク内の水を冷却水タンクに供給する水供給ポンプを設けた水供給路とを具備し、フロートスイッチの外周を囲むように筒形フイルタを設け、この筒形フイルタの下方の出口部と水供給路の入口部とを連通させ、前記筒形フィルタをメンテナンスする場合は前記筒形フィルタと前記フロートスイッチとを一体にして上方に取り外せるように構成されているものである。 According to a first aspect of the present invention, there is provided a polymer electrolyte fuel cell that generates power using a fuel gas and an oxidant gas, a cooling water tank that stores cooling water for cooling the fuel cell, and exhaust fuel discharged from the fuel cell. A condensed water tank opened to the atmosphere that stores condensed water condensed with gas and exhaust oxidant gas, a float switch that keeps the water level in this condensed water tank constant, and water in the condensed water tank into the cooling water tank A water supply passage provided with a water supply pump for supplying water, a cylindrical filter is provided so as to surround the outer periphery of the float switch, and an outlet portion below the cylindrical filter is connected to an inlet portion of the water supply passage. When performing maintenance on the cylindrical filter, the cylindrical filter and the float switch are integrated and can be removed upward .

この構成により、凝縮水タンクの構造が簡素化でき、そのためコスト低減が図れ、かつメンテナンスも容易にすることができる。   With this configuration, the structure of the condensed water tank can be simplified, so that the cost can be reduced and maintenance can be facilitated.

第２の発明は、第１の発明において、筒形フイルタの下方の出口部と水供給路の入口部との間にパッキンを介して連通させたものであり、この構成により、水供給ポンプも細菌などの侵入が極力無い状態が得られるため水供給ポンプの故障も防止できる。   According to a second aspect of the present invention, in the first aspect of the present invention, a water supply pump is also connected to the outlet portion below the cylindrical filter and the inlet portion of the water supply path via a packing. A water supply pump can be prevented from malfunctioning because a state in which bacteria and the like do not enter is obtained as much as possible.

第３の発明は、第１の発明において、フロートスイッチと水供給路の入口部を同軸上に配置したものであり、この構成により、水供給ポンプ動作時はフロートスイッチの回りは流水状態が得られることになり細菌がフロートスイッチに付着しにくくなる。   According to a third invention, in the first invention, the float switch and the inlet portion of the water supply path are arranged coaxially. With this configuration, a flowing water state is obtained around the float switch when the water supply pump is operated. This makes it difficult for bacteria to adhere to the float switch.

以下、本発明の実施の形態について、図面を参照しながら説明するが、この実施の形態によって本発明が限定されるものではない。
（実施の形態１）
図１は、本発明の実施の形態１における固体高分子形の燃料電池システムの構成図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the embodiments.
(Embodiment 1)
FIG. 1 is a configuration diagram of a solid polymer fuel cell system according to Embodiment 1 of the present invention.

本実施の形態１における燃料電池システムには、燃料ガスと酸化剤ガスを用いて発電を行う固体高分子形の燃料電池１１と、この燃料電池１１を冷却する冷却水を貯める冷却水タンク１２と、冷却水を循環させる冷却水路１３と、冷却水を冷却水路１３に循環させる手段としての冷却水ポンプ１４と、冷却水を冷却する熱交換器１５を有する。   The fuel cell system according to Embodiment 1 includes a solid polymer fuel cell 11 that generates power using fuel gas and an oxidant gas, and a cooling water tank 12 that stores cooling water for cooling the fuel cell 11. The cooling water passage 13 for circulating the cooling water, the cooling water pump 14 as means for circulating the cooling water to the cooling water passage 13, and the heat exchanger 15 for cooling the cooling water are provided.

また、この燃料電池システムは、燃料電池１１より排出される排気燃料ガスを冷却し含まれる水蒸気を凝縮させる燃料側凝縮器１６と、燃料電池１１より排出される排気酸化剤ガスを冷却し含まれる水蒸気を凝縮させる空気側凝縮器１７と、燃料側凝縮器１６および空気側凝縮器１７で凝縮した凝縮水を貯めるとともに大気に開放された凝縮水タンク１８を有する。   In addition, the fuel cell system includes a fuel side condenser 16 that cools the exhaust fuel gas discharged from the fuel cell 11 and condenses the water vapor contained therein, and an exhaust oxidant gas that is discharged from the fuel cell 11. An air side condenser 17 that condenses water vapor, and a condensed water tank 18 that stores condensed water condensed by the fuel side condenser 16 and the air side condenser 17 and that is open to the atmosphere.

さらに、この燃料電池システムは、凝縮水タンク１８内の水位を一定に保持するフロートスイッチ１９と、凝縮水タンク１８内の水を冷却水タンク１２に供給する水供給ポンプ２０を設けた水供給路２１と、冷却水タンク１２内部の余剰冷却水を排出する水排出路２２とフロートスイッチ１９の外周を囲むように設けた筒形フイルタ２３と、この筒形フイルタ２３の下方の出口部２４と、出口部２４と水供給路２１の入口部２５とを漏れなく連通させるパッキン２６とを備えている。なお、フロートスイッチ１９と水供給路２１の入口部２５の位置関係は同軸上である。   Further, this fuel cell system has a water supply path provided with a float switch 19 that keeps the water level in the condensed water tank 18 constant, and a water supply pump 20 that supplies the water in the condensed water tank 18 to the cooling water tank 12. 21, a water discharge path 22 for discharging excess cooling water inside the cooling water tank 12, a cylindrical filter 23 provided so as to surround the outer periphery of the float switch 19, an outlet portion 24 below the cylindrical filter 23, A packing 26 is provided that allows the outlet 24 and the inlet 25 of the water supply path 21 to communicate with each other without leakage. The positional relationship between the float switch 19 and the inlet portion 25 of the water supply path 21 is coaxial.

次に、本実施の形態における燃料電池システムの凝縮水タンク１８の運転動作を説明する。   Next, the operation of the condensed water tank 18 of the fuel cell system in the present embodiment will be described.

燃料ガスと酸化剤ガスを燃料電池１１に供給する。燃料電池１１の電気化学反応によって酸化剤ガス側に水が生成される。燃料電池１１から排出された酸化剤ガスは空気側凝縮器１７に導かれ外気と熱交換することにより温度が低下し、排気燃料ガスに含まれる水蒸気は凝縮し水として凝縮水タンク１８に回収される。   Fuel gas and oxidant gas are supplied to the fuel cell 11. Water is generated on the oxidant gas side by the electrochemical reaction of the fuel cell 11. The oxidant gas discharged from the fuel cell 11 is led to the air-side condenser 17 and the temperature is lowered by exchanging heat with the outside air, and the water vapor contained in the exhaust fuel gas is condensed and collected as water in the condensed water tank 18. The

一方、燃料電池１１から排出された排気燃料ガスは燃料側凝縮器１６に導かれ外気と熱交換することにより温度が低下し、排気燃料ガスに含まれる水蒸気は凝縮し水として凝縮水タンク１８に回収される。   On the other hand, the exhaust fuel gas discharged from the fuel cell 11 is led to the fuel-side condenser 16 to exchange heat with the outside air, so that the temperature is lowered, and the water vapor contained in the exhaust fuel gas is condensed to the condensed water tank 18 as water. Collected.

さらに発電を行う燃料電池１１の温度を７０℃以上で一定に保つために冷却水路１３を通して冷却水ポンプ１４で水を循環させ熱交換器１５において燃料電池１１で発生した熱を外部へ放出する。また冷却水タンク１２内部の冷却水が減少したときは水供給路２１の水供給ポンプ２０を作動させることにより冷却水タンク１２に凝縮水タンク１８の水を供給する。このとき水が過剰に入ったとしても水排出路２２により余剰冷却水は凝縮水タンク１８に排出される。   Further, in order to keep the temperature of the fuel cell 11 that generates power constant at 70 ° C. or higher, water is circulated by the cooling water pump 14 through the cooling water passage 13, and the heat generated in the fuel cell 11 in the heat exchanger 15 is released to the outside. When the cooling water in the cooling water tank 12 decreases, the water supply pump 20 in the water supply path 21 is operated to supply the water in the condensed water tank 18 to the cooling water tank 12. Even if water enters excessively at this time, the excess cooling water is discharged to the condensed water tank 18 through the water discharge path 22.

さらに冷却水タンク１２の上方にある気体は水排出路２２を通じて大気開放された凝縮水タンク１８と接続されているため、冷却水タンク１２内部の圧力は常に大気開放された状態と同等である。   Further, since the gas above the cooling water tank 12 is connected to the condensed water tank 18 opened to the atmosphere through the water discharge path 22, the pressure inside the cooling water tank 12 is always equivalent to the state opened to the atmosphere.

一方筒形フイルタ２３により筒形フイルタ２３内部は細菌などの侵入が極力無い状態が得られ、よってフロートスイッチ１９の誤動作も防止できる。筒形フイルタ２３の下方の出口部２４と水供給路２１の入口部２５とはパッキン２６を介して連通されており水供給ポンプ２０も細菌などの侵入が極力無い状態が得られるため水供給ポンプ２０の故障も防止できる。   On the other hand, the cylindrical filter 23 provides a state in which bacteria and the like are hardly invaded inside the cylindrical filter 23, so that the malfunction of the float switch 19 can be prevented. The outlet part 24 below the cylindrical filter 23 and the inlet part 25 of the water supply passage 21 are communicated with each other through a packing 26, and the water supply pump 20 is also in a state in which bacteria and the like do not enter as much as possible. Twenty failures can be prevented.

さらにはフロートスイッチ１９と水供給路２１の入口部２５は同軸上であるため水供給ポンプ２０動作時はフロートスイッチ１９の回りは流水状態が得られることになり細菌がフロートスイッチ１９に付着しにくくなる。   Furthermore, since the float switch 19 and the inlet 25 of the water supply path 21 are coaxial, when the water supply pump 20 is operated, a flowing water state is obtained around the float switch 19 and bacteria are less likely to adhere to the float switch 19. Become.

その効果はフロートスイッチ１９と筒形フイルタ２３との間隔を狭くする程顕著であり同時に全体構成のコンパクト化も図れる。万一、筒形フイルタ２３のメンテナンス時は筒形フイルタ２３とフロートスイッチ１９が合体状態で上方に外せるためメンテナンスが容易で外した状態でも凝縮水タンク１８の水が漏れることも無い。   The effect becomes more prominent as the distance between the float switch 19 and the cylindrical filter 23 is reduced, and at the same time, the overall configuration can be made compact. In the case of maintenance of the cylindrical filter 23, the cylindrical filter 23 and the float switch 19 can be removed upward in the combined state, so that maintenance is easy and the water in the condensed water tank 18 does not leak even when the cylindrical filter 23 is removed.

本発明の燃料電池システムは、凝縮水タンクの構造を簡素化できるためコスト低減を図ることができ、かつメンテナンスも容易にすることができるなど極めて有用である。   The fuel cell system of the present invention is extremely useful in that the structure of the condensed water tank can be simplified and the cost can be reduced and maintenance can be facilitated.

本発明の実施の形態１における燃料電池システムの構成図1 is a configuration diagram of a fuel cell system according to Embodiment 1 of the present invention. 同燃料電池システムの凝縮水タンクに設ける筒形フイルタの拡大構成図Expanded configuration diagram of the cylindrical filter provided in the condensate tank of the fuel cell system 同燃料電池システムの凝縮水タンクに設ける筒形フイルタの拡大斜視図An enlarged perspective view of a cylindrical filter provided in a condensate tank of the fuel cell system 従来の燃料電池システムの構成図Configuration diagram of conventional fuel cell system

符号の説明Explanation of symbols

１１ 燃料電池
１２ 冷却水タンク
１８ 凝縮水タンク
１９ フロートスイッチ
２０ 水供給ポンプ
２１ 水供給路
２３ 筒形フイルタ
２４ 出口部
２５ 入口部
２６ パッキン DESCRIPTION OF SYMBOLS 11 Fuel cell 12 Cooling water tank 18 Condensed water tank 19 Float switch 20 Water supply pump 21 Water supply path 23 Cylindrical filter 24 Outlet part 25 Inlet part 26 Packing

Claims (3)

燃料ガスと酸化剤ガスを用いて発電を行う固体高分子形の燃料電池と、
この燃料電池を冷却する冷却水を貯める冷却水タンクと、
前記燃料電池より排出される排気燃料ガスおよび排気酸化剤ガスを凝縮した凝縮水を貯める大気に開放された凝縮水タンクと、
この凝縮水タンク内の水位を一定に保持するフロートスイッチと、
前記凝縮水タンク内の水を前記冷却水タンクに供給する水供給ポンプを設けた水供給路と、
を具備し、
前記フロートスイッチの外周を囲むように筒形フイルタを設け、この筒形フイルタの下方の出口部と前記水供給路の入口部とを連通させ、
前記筒形フィルタをメンテナンスする場合は前記筒形フィルタと前記フロートスイッチとを一体にして上方に取り外せるように構成されている、
燃料電池システム。 A polymer electrolyte fuel cell that generates power using fuel gas and oxidant gas;
A cooling water tank for storing cooling water for cooling the fuel cell;
A condensed water tank opened to the atmosphere for storing condensed water obtained by condensing exhaust fuel gas and exhaust oxidant gas discharged from the fuel cell;
A float switch that keeps the water level in the condensate tank constant,
A water supply path provided with a water supply pump for supplying water in the condensed water tank to the cooling water tank ;
Comprising
A cylindrical filter is provided so as to surround the outer periphery of the float switch, and an outlet part below the cylindrical filter and an inlet part of the water supply path are communicated with each other .
When maintaining the cylindrical filter, the cylindrical filter and the float switch are integrated and can be removed upward.
Fuel cell system. 前記筒形フイルタの下方の出口部と前記水供給路の入口部との間にパッキンを介して連通させた請求項１記載の燃料電池システム。   2. The fuel cell system according to claim 1, wherein a communication is provided between an outlet portion below the cylindrical filter and an inlet portion of the water supply path via a packing. 前記フロートスイッチと前記水供給路の入口部を同軸上に配置した請求項１記載の燃料電池システム。
The fuel cell system according to claim 1, wherein the float switch and the inlet of the water supply path are arranged coaxially.
JP2008178831A 2008-07-09 2008-07-09 Fuel cell system Expired - Fee Related JP5251312B2 (en)

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JP5251312B2 true JP5251312B2 (en) 2013-07-31

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