JP2014220090A - Fuel cell system - Google Patents

Fuel cell system Download PDF

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JP2014220090A
JP2014220090A JP2013098094A JP2013098094A JP2014220090A JP 2014220090 A JP2014220090 A JP 2014220090A JP 2013098094 A JP2013098094 A JP 2013098094A JP 2013098094 A JP2013098094 A JP 2013098094A JP 2014220090 A JP2014220090 A JP 2014220090A
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water
storage tank
fuel cell
hot water
heat exchanger
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JP6157203B2 (en
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大友　昇
Noboru Otomo
昇 大友
毅 柏瀬
Takeshi Kashiwase
毅 柏瀬
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Atago Seisakusho 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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Abstract

PROBLEM TO BE SOLVED: To provide a fuel cell system the cost reduction of which can be achieved by eliminating the need for a cooling radiator.SOLUTION: A fuel cell system includes a fuel cell unit 10 including a fuel cell stack 12, and a waste-heat recovery heat exchanger 15 for recovering the waste heat of the fuel cell stack 12, a hot water storage tank 21, a circulation pipeline 16A for circulating water between the hot water storage tank 21 and the waste-heat recovery heat exchanger 15, and a backup water heater 22A inserted into the water passage of the circulation pipeline 16A, and capable of heating or cooling the water supplied from the hot water storage tank 21 through the circulation pipeline 16A. The backup water heater 22A is configured to cool the water from the hot water storage tank 21, when the temperature of water therein is higher than a predetermined temperature, and then supply the water to the waste-heat recovery heat exchanger 15 through the circulation pipeline 16A.

Description

本発明は、燃料電池を備える燃料電池システムに関し、特に、燃料電池の排熱を用いて水を加熱し、貯湯タンクに貯蔵してそれを給湯や暖房等の用途に提供することが可能な燃料電池システムに関する。   The present invention relates to a fuel cell system including a fuel cell, and in particular, a fuel capable of heating water using exhaust heat of the fuel cell and storing it in a hot water storage tank and providing it for uses such as hot water supply and heating. The present invention relates to a battery system.

従来、燃料電池の発電により発生した排熱を熱交換器により水との間で熱交換して加熱した後に貯湯タンクに供給・貯蔵するという燃料電池システムが知られている。図３は、従来の燃料電池システムの構成を示す図である。   2. Description of the Related Art Conventionally, a fuel cell system is known in which exhaust heat generated by power generation of a fuel cell is heated by exchanging heat with water using a heat exchanger and then supplied to and stored in a hot water storage tank. FIG. 3 is a diagram showing a configuration of a conventional fuel cell system.

この燃料電池システムは、燃料電池ユニット１０、貯湯ユニット２０を備える。燃料電池ユニット１０は、燃料改質装置１１、燃料電池スタック１２、空気供給機１３、インバータ１４、及び排熱回収熱交換器１５を含んで構成される。また、貯湯ユニット２０は、貯湯タンク２１、バックアップ給湯器２２、三方弁２３、及びラジエター２４を含んで構成される。   This fuel cell system includes a fuel cell unit 10 and a hot water storage unit 20. The fuel cell unit 10 includes a fuel reformer 11, a fuel cell stack 12, an air supplier 13, an inverter 14, and an exhaust heat recovery heat exchanger 15. The hot water storage unit 20 includes a hot water storage tank 21, a backup hot water heater 22, a three-way valve 23, and a radiator 24.

燃料電池ユニット１０において、燃料改質装置１１は都市ガスやＬＰガスと水蒸気の反応を利用して水素を取り出す。燃料電池スタック１２は、燃料改質装置１１からの水素と、空気供給機１３からの酸素とを化学反応させて直流の電気を発生する。
インバータ１４は燃料電池スタック１２で発生された直流の電気を交流に変換して、家庭用の電源として利用できるようにする。排熱回収熱交換器１５は、燃料電池スタック１２の排熱（排気ガス）と循環配管１６の通水との間で熱交換を行うことで、循環配管１６の通水を加熱する。 In the fuel cell unit 10, the fuel reformer 11 takes out hydrogen by utilizing the reaction of city gas or LP gas with water vapor. The fuel cell stack 12 generates direct current electricity by chemically reacting hydrogen from the fuel reformer 11 and oxygen from the air supply unit 13.
The inverter 14 converts direct current electricity generated in the fuel cell stack 12 into alternating current so that it can be used as a household power source. The exhaust heat recovery heat exchanger 15 heats the water through the circulation pipe 16 by exchanging heat between the exhaust heat (exhaust gas) of the fuel cell stack 12 and the water through the circulation pipe 16.

循環配管１６は、貯湯タンク２１と排熱回収熱交換器１５との間で通水を循環させる。循環配管１６の一部は排熱回収熱交換器１５内に配置されている。バックアップ給湯器２２は貯湯タンク２１からの水が供給され、追い炊きが必要なときに作動して水を加熱するために設けられている。   The circulation pipe 16 circulates water between the hot water storage tank 21 and the exhaust heat recovery heat exchanger 15. A part of the circulation pipe 16 is disposed in the exhaust heat recovery heat exchanger 15. The backup water heater 22 is provided to heat the water when it is supplied with water from the hot water storage tank 21 and needs additional cooking.

燃料電池システムの運転時において、循環配管１６を通して、貯湯タンク２１→三方弁２３→排熱回収熱交換器１５→貯湯タンク２１という循環通水路が形成される。このとき、貯湯タンク２１が所定温度（例えば、６０°Ｃ〜８０°Ｃ）以上の高温水で満たされていると、当該高温水が循環配管１６を通して排熱回収熱交換器１５へ供給されるため、排熱回収熱交換器１５の熱交換効率が落ち、システムの熱的バランスが崩れてしまう。   During operation of the fuel cell system, a circulating water passage is formed through the circulation pipe 16 such as the hot water storage tank 21 → the three-way valve 23 → the exhaust heat recovery heat exchanger 15 → the hot water storage tank 21. At this time, if the hot water storage tank 21 is filled with high temperature water of a predetermined temperature (for example, 60 ° C. to 80 ° C.) or higher, the high temperature water is supplied to the exhaust heat recovery heat exchanger 15 through the circulation pipe 16. Therefore, the heat exchange efficiency of the exhaust heat recovery heat exchanger 15 is lowered, and the thermal balance of the system is lost.

そこで、この問題を解決するために、貯湯タンク２１から排熱回収熱交換器１５へ至る循環配管１６の途中にラジエター２４を設け、循環配管１６内を流れる高温水を冷却した後に、排熱回収熱交換器１５に供給していた。   Therefore, in order to solve this problem, a radiator 24 is provided in the middle of the circulation pipe 16 extending from the hot water storage tank 21 to the exhaust heat recovery heat exchanger 15, and after cooling the high-temperature water flowing through the circulation pipe 16, the exhaust heat recovery is performed. It was supplied to the heat exchanger 15.

この種の燃料電池システムは、例えば特許文献１に開示されている。   This type of fuel cell system is disclosed in Patent Document 1, for example.

特開２０１３−５５０６５号公報JP 2013-55065 A

しかしながら、従来の燃料電池システムにおいては、冷却用のラジエター２４を設けていたので、その分コストが高くなるという問題があった。また、ラジエター２４を設けると、貯湯タンク２１の水の温度が低い時でも、水が冷却されて循環するため熱効率が悪い（貯湯タンク２１の水の温度上昇が遅くなる）という問題もあった。   However, in the conventional fuel cell system, since the radiator 24 for cooling is provided, there is a problem that the cost increases accordingly. In addition, when the radiator 24 is provided, even when the temperature of the water in the hot water storage tank 21 is low, the water is cooled and circulated, so that there is a problem that the thermal efficiency is poor (the temperature rise of the water in the hot water storage tank 21 is slow).

上述した課題に鑑み、本発明の燃料電池システムは、燃料電池と、該燃料電池の排熱を回収する排熱回収熱交換器とを備えた燃料電池ユニットと、貯湯タンクと、前記貯湯タンクと前記排熱回収熱交換器との間で水を循環させる循環配管と、前記循環配管の通水路に挿入され、前記貯湯タンクから前記循環配管を通して供給される水を加熱又は冷却することが可能なバックアップ給湯器と、を備え、前記バックアップ給湯器は、前記貯湯タンク内の水の温度が所定温度より高いときに前記貯湯タンクからの水を冷却した後に、前記循環配管を通して前記排熱回収熱交換器に供給するように構成されたことを特徴とすることを特徴とする。   In view of the above-described problems, a fuel cell system of the present invention includes a fuel cell, a fuel cell unit including a heat recovery heat exchanger that recovers exhaust heat of the fuel cell, a hot water storage tank, and the hot water storage tank. A circulation pipe that circulates water between the exhaust heat recovery heat exchanger and a water passage of the circulation pipe, and is capable of heating or cooling water supplied from the hot water storage tank through the circulation pipe. A backup water heater, wherein the backup water heater cools the water from the hot water storage tank when the temperature of the water in the hot water storage tank is higher than a predetermined temperature, and then the heat recovery heat exchange through the circulation pipe It is characterized by being comprised so that it may supply to a container.

本発明の燃料電池システムによれば、バックアップ給湯器の冷却機能を利用して高温水を冷却しているので、冷却用のラジエターを不要にしてシステムの低コスト化を実現することができる。   According to the fuel cell system of the present invention, since the high-temperature water is cooled by using the cooling function of the backup water heater, it is possible to reduce the cost of the system by eliminating the cooling radiator.

しかも、本発明の燃料電池システムによれば、バックアップ給湯器は、貯湯タンク内の水の温度が所定温度より高いときにだけ、これを冷却するように構成されているので、熱効率を向上させることができる。（貯湯タンクの水の温度上昇が速くなる）   Moreover, according to the fuel cell system of the present invention, the backup water heater is configured to cool only when the temperature of the water in the hot water storage tank is higher than a predetermined temperature, thereby improving the thermal efficiency. Can do. (Temperature rise of water in the hot water storage tank becomes faster)

本発明の実施形態における燃料電池システムの構成を示す図である。It is a figure which shows the structure of the fuel cell system in embodiment of this invention. 本発明の実施形態におけるバックアップ給湯器の構成を示す図である。It is a figure which shows the structure of the backup water heater in embodiment of this invention. 従来例における燃料電池システムの構成を示す図である。It is a figure which shows the structure of the fuel cell system in a prior art example.

以下、本発明の実施形態における燃料電池システムを図面に基づいて説明する。図１は、本実施形態における燃料電池システムの構成を示す図である。   Hereinafter, a fuel cell system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a fuel cell system in the present embodiment.

この燃料電池システムは、燃料電池ユニット１０、貯湯ユニット２０Ａを備える。燃料電池ユニット１０は、燃料改質装置１１、燃料電池スタック１２、空気供給機１３、インバータ１４、及び排熱回収熱交換器１５を含んで構成される。また、貯湯ユニット２０Ａは、貯湯タンク２１、バックアップ給湯器２２Ａ、第１の三方弁２５、第２の三方弁２６を含んで構成される。   This fuel cell system includes a fuel cell unit 10 and a hot water storage unit 20A. The fuel cell unit 10 includes a fuel reformer 11, a fuel cell stack 12, an air supplier 13, an inverter 14, and an exhaust heat recovery heat exchanger 15. The hot water storage unit 20A includes a hot water storage tank 21, a backup water heater 22A, a first three-way valve 25, and a second three-way valve 26.

燃料電池ユニット１０の構成は、従来の燃料電池システム（図３）と同様なので説明を省略する。貯湯ユニット２０Ａにおいて、バックアップ給湯器２２Ａは、貯湯タンク２１から循環配管１６Ａを通して供給される水を加熱又は冷却することが可能であり、貯湯タンク２１から排熱回収熱交換器１５へ至る循環配管１６Ａの通水路に挿入されている。そして、バックアップ給湯器２２Ａは、貯湯タンク２１内の水の温度が所定温度（例えば、６０°Ｃ〜８０°Ｃ）より高いときにだけ貯湯タンク２１からの水を冷却した後に、循環配管１６Ａ、第２の三方弁２６、及び第１の三方弁２５を通して排熱回収熱交換器１５に供給するように構成されている。貯湯タンク２１内の水の温度は温度センサにより検知することができる。   Since the configuration of the fuel cell unit 10 is the same as that of the conventional fuel cell system (FIG. 3), the description thereof is omitted. In the hot water storage unit 20A, the backup water heater 22A can heat or cool the water supplied from the hot water storage tank 21 through the circulation pipe 16A, and the circulation pipe 16A extending from the hot water storage tank 21 to the exhaust heat recovery heat exchanger 15. Is inserted into the waterway. Then, the backup water heater 22A cools the water from the hot water storage tank 21 only when the temperature of the water in the hot water storage tank 21 is higher than a predetermined temperature (for example, 60 ° C. to 80 ° C.). The exhaust heat recovery heat exchanger 15 is configured to be supplied through the second three-way valve 26 and the first three-way valve 25. The temperature of the water in the hot water storage tank 21 can be detected by a temperature sensor.

このように、バックアップ給湯器２２Ａの冷却機能を利用して高温水を冷却しているので、冷却用のラジエターを不要にしてシステムの低コスト化を実現することができる。しかも、バックアップ給湯器２２Ａは、貯湯タンク２１内の水の温度が所定温度より高いときにだけ貯湯タンク２１からの水を冷却するように構成されているので、熱効率を向上させることができる。   Thus, since the high-temperature water is cooled using the cooling function of the backup water heater 22A, it is possible to reduce the cost of the system by eliminating the cooling radiator. Moreover, since the backup water heater 22A is configured to cool the water from the hot water storage tank 21 only when the temperature of the water in the hot water storage tank 21 is higher than a predetermined temperature, the thermal efficiency can be improved.

そして、貯湯タンク２１からの水の追い炊きが必要なときは、バックアップ給湯器２２Ａは水を加熱して給湯する。第２の三方弁２６（通水路切換弁）は、循環配管１６Ａに接続され、バックアップ給湯器２２Ａが貯湯タンク２１からの水を加熱するときは、バックアップ給湯器２２Ａから排熱回収熱交換器１５に至る通水路を遮断し、バックアップ給湯器２２Ａが貯湯タンク２１からの水を冷却するときには、バックアップ給湯器２２Ａから排熱回収熱交換器１５に至る通水路を形成するように通水路を切り換えている。   When the water from the hot water storage tank 21 needs to be reheated, the backup water heater 22A heats the water to supply hot water. The second three-way valve 26 (water passage switching valve) is connected to the circulation pipe 16A, and when the backup water heater 22A heats the water from the hot water storage tank 21, the exhaust heat recovery heat exchanger 15 from the backup water heater 22A. When the backup water heater 22A cools the water from the hot water storage tank 21, the water passage is switched so as to form a water passage from the backup water heater 22A to the exhaust heat recovery heat exchanger 15. Yes.

上述のようにバックアップ給湯器２２Ａは、貯湯タンク２１から循環配管１６Ａを通して供給される水を加熱又は冷却することが可能であるが、その具体的な構成を図２に基づいて説明する。   As described above, the backup water heater 22A can heat or cool the water supplied from the hot water storage tank 21 through the circulation pipe 16A. A specific configuration thereof will be described with reference to FIG.

バックアップ給湯器２２Ａは、バーナ２２１、給気ファン２２２、コントローラ２２３、主熱交換器２２４、副熱交換器２２５を含んで構成される。   The backup water heater 22A includes a burner 221, an air supply fan 222, a controller 223, a main heat exchanger 224, and a sub heat exchanger 225.

給気ファン２２２は、バーナ２２１の下方に配置される。バーナ２２１は給気ファン２２２からの空気とガス配管（不図示）からの燃料ガスとの混合ガスを燃焼し、燃焼排気を発生する。主熱交換器２２４はバーナ２２１の上方に配置され、主伝熱管２２４ａと、多数の熱回収フィン２２４ｂを備え、バーナ１２からの燃焼排気のほとんどの顕熱を回収する。コントローラ２２３は、バーナ２２１の点火と給気ファン２２２の運転を制御する。   The supply fan 222 is disposed below the burner 221. The burner 221 burns a mixed gas of air from the air supply fan 222 and fuel gas from a gas pipe (not shown), and generates combustion exhaust. The main heat exchanger 224 is disposed above the burner 221 and includes a main heat transfer tube 224a and a large number of heat recovery fins 224b, and recovers most of the sensible heat of the combustion exhaust from the burner 12. The controller 223 controls the ignition of the burner 221 and the operation of the air supply fan 222.

主熱交換器２２４の上方には、副熱交換器２２５が設けられる。副熱交換器２２５は、副伝熱管２２５ａと、多数の熱回収フィン２２５ｂを備え、主熱交換器２２４を通過した燃焼排気が案内されて主熱交換器２２４で回収されなかった顕熱に加えて潜熱を回収して副伝熱管２２５ａ内の通水を加熱する。   A sub heat exchanger 225 is provided above the main heat exchanger 224. The auxiliary heat exchanger 225 includes an auxiliary heat transfer tube 225a and a large number of heat recovery fins 225b. In addition to the sensible heat that is not recovered by the main heat exchanger 224, the combustion exhaust gas that has passed through the main heat exchanger 224 is guided. The latent heat is recovered to heat the water flow in the auxiliary heat transfer tube 225a.

バックアップ給湯器２２Ａ内の全体の通水路は、上流から順に、給水管２２６、副熱交換器２２５に設けられる副伝熱管２２５ａ、主熱交換器２２４に設けられる主伝熱管２２４ａ、出湯管２２９である。給水管２２６には、バックアップ給湯器２２Ａの上流側の循環配管１６Ａを介して貯湯タンク２１からの水が供給される。出湯管２２９は、第２の三方弁２６の上流側の循環配管１６Ａに接続される。また、副熱交換器２２５での潜熱回収によって発生した酸性のドレンは、中和器２２７で中和された後、ドレン配管２２８を介して外部に排出される。   The entire water passage in the backup water heater 22A is, in order from the upstream, a water supply pipe 226, a sub heat transfer pipe 225a provided in the sub heat exchanger 225, a main heat transfer pipe 224a provided in the main heat exchanger 224, and a hot water discharge pipe 229. is there. Water from the hot water storage tank 21 is supplied to the water supply pipe 226 via a circulation pipe 16A on the upstream side of the backup water heater 22A. The hot water discharge pipe 229 is connected to the circulation pipe 16 </ b> A on the upstream side of the second three-way valve 26. The acidic drain generated by the latent heat recovery in the auxiliary heat exchanger 225 is neutralized by the neutralizer 227 and then discharged to the outside through the drain pipe 228.

上述のバックアップ給湯器２２Ａにあっては、主熱交換器２２４に加えて、副熱交換器２２５が設けられているので、燃焼排気中のほとんどの熱エネルギーを回収することができる。そして、コントローラ２２３は貯湯タンク２１内の水の温度が所定温度より高いときには、バーナ２２１の燃焼を停止させた状態で給気ファン２２２を作動させ、給気ファン２２２からの空気と主熱交換器２２４の主伝熱管２２４ａ、副熱交換器２２５の副伝熱管２２５ａ内の通水との間で熱交換を行うことで、貯湯タンク２１からの水を冷却することができる。   In the backup water heater 22A described above, since the auxiliary heat exchanger 225 is provided in addition to the main heat exchanger 224, most of the thermal energy in the combustion exhaust gas can be recovered. When the temperature of the water in the hot water storage tank 21 is higher than a predetermined temperature, the controller 223 operates the air supply fan 222 with the combustion of the burner 221 stopped, and the air from the air supply fan 222 and the main heat exchanger Water from the hot water storage tank 21 can be cooled by exchanging heat between the main heat transfer tube 224a of 224 and the water flow in the sub heat transfer tube 225a of the sub heat exchanger 225.

副熱交換器２２５が設けられていない給湯器においても、主熱交換器２２５により貯湯タンク２１からの水を冷却することができるが、主熱交換器２２５に加えて
副熱交換器２２５を設けることで、冷却機能を高めることができる。 Even in a water heater in which the auxiliary heat exchanger 225 is not provided, the water from the hot water storage tank 21 can be cooled by the main heat exchanger 225, but the auxiliary heat exchanger 225 is provided in addition to the main heat exchanger 225. Thus, the cooling function can be enhanced.

次に、このように構成された燃料電池システムの動作を説明する。先ず、貯湯タンク２１に水が入っていない状態で、第１の三方弁２５を介して循環配管１６Ａに水道水を導入する。貯湯タンク２１に水が満たされると、第１の三方弁２５が切り換えられ、循環配管１６Ａにより貯湯タンク２１と排熱回収熱交換器１５との間の循環通水路が形成される。そして、燃料電池ユニット１０が作動すると、燃料電池スタック１２が発電を行う。その際に発生する排熱は、排熱回収熱交換器１５により回収され、循環配管１６Ａ内の通水が加熱される。これにより、貯湯タンク２１内の水の温度は上昇していく。   Next, the operation of the fuel cell system configured as described above will be described. First, tap water is introduced into the circulation pipe 16 </ b> A through the first three-way valve 25 in a state where no water is contained in the hot water storage tank 21. When the hot water storage tank 21 is filled with water, the first three-way valve 25 is switched, and a circulation water passage between the hot water storage tank 21 and the exhaust heat recovery heat exchanger 15 is formed by the circulation pipe 16A. When the fuel cell unit 10 operates, the fuel cell stack 12 generates power. The exhaust heat generated at that time is recovered by the exhaust heat recovery heat exchanger 15, and the water flow in the circulation pipe 16A is heated. Thereby, the temperature of the water in the hot water storage tank 21 rises.

そして、バックアップ給湯器２２Ａは、貯湯タンク２１内の水の温度が所定温度（例えば、６０°Ｃ〜８０°Ｃ）より高くなると、貯湯タンク２１からの水を冷却した後に、循環配管１６Ａ、第２の三方弁２６、及び第１の三方弁２５を通して排熱回収熱交換器１５に供給する。   When the temperature of the water in the hot water storage tank 21 becomes higher than a predetermined temperature (for example, 60 ° C. to 80 ° C.), the backup water heater 22A cools the water from the hot water storage tank 21, and then the circulation pipe 16A, The exhaust gas is supplied to the exhaust heat recovery heat exchanger 15 through the two three-way valves 26 and the first three-way valve 25.

１０ 燃料電池ユニット
１１ 燃料改質装置
１２ 燃料電池スタック
１３ 空気供給機
１４ インバータ
１５ 排熱回収熱交換器
１６Ａ 循環配管
２０Ａ 貯湯ユニット
２１ 貯湯タンク
２２Ａ バックアップ給湯器
２５ 第１の三方弁
２６ 第２の三方弁
２２１ バーナ
２２２ 給気ファン
２２３ コントローラ
２２４ 主熱交換器
２２５ 副熱交換器 DESCRIPTION OF SYMBOLS 10 Fuel cell unit 11 Fuel reformer 12 Fuel cell stack 13 Air supply machine 14 Inverter 15 Waste heat recovery heat exchanger 16A Circulation piping 20A Hot water storage unit 21 Hot water storage tank 22A Backup hot water heater 25 First three-way valve 26 Second three-way Valve 221 Burner 222 Air supply fan 223 Controller 224 Main heat exchanger 225 Sub heat exchanger

Claims (3)

燃料電池と、該燃料電池の排熱を回収する排熱回収熱交換器とを備えた燃料電池ユニットと、
貯湯タンクと、
前記貯湯タンクと前記排熱回収熱交換器との間で水を循環させる循環配管と、
前記循環配管の通水路に挿入され、前記貯湯タンクから前記循環配管を通して供給される水を加熱又は冷却することが可能なバックアップ給湯器と、を備え、
前記バックアップ給湯器は、前記貯湯タンク内の水の温度が所定温度より高いときに前記貯湯タンクからの水を冷却した後に、前記循環配管を通して前記排熱回収熱交換器に供給するように構成されたことを特徴とすることを特徴とする燃料電池システム。 A fuel cell unit comprising a fuel cell and an exhaust heat recovery heat exchanger for recovering the exhaust heat of the fuel cell;
A hot water storage tank,
A circulation pipe for circulating water between the hot water storage tank and the exhaust heat recovery heat exchanger;
A backup water heater that is inserted into a water passage of the circulation pipe and that can heat or cool water supplied from the hot water storage tank through the circulation pipe, and
The backup water heater is configured to supply water to the exhaust heat recovery heat exchanger through the circulation pipe after cooling the water from the hot water storage tank when the temperature of the water in the hot water storage tank is higher than a predetermined temperature. A fuel cell system characterized by that. 前記バックアップ給湯器は、バーナと、該バーナに空気を供給する給気ファンと、
前記バーナの上方に配置され、前記給気ファンからの空気と前記貯湯タンクからの水との間で熱交換を行う熱交換器を備え、
前記貯湯タンク内の水の温度が所定温度より高いときに前記バーナの燃焼を停止させた状態で前記給気ファンを作動させ、前記熱交換器により前記貯湯タンクからの水を冷却することを特徴とする請求項１に記載の燃料電池システム。 The backup water heater includes a burner, an air supply fan for supplying air to the burner,
A heat exchanger disposed above the burner and performing heat exchange between air from the air supply fan and water from the hot water storage tank;
When the temperature of the water in the hot water storage tank is higher than a predetermined temperature, the air supply fan is operated in a state where combustion of the burner is stopped, and the water from the hot water storage tank is cooled by the heat exchanger. The fuel cell system according to claim 1. 前記バックアップ給湯器が前記貯湯タンクからの水を加熱するときは、前記バックアップ給湯器から前記排熱回収熱交換器に至る通水路を遮断し、前記バックアップ給湯器が前記貯湯タンクからの水を冷却するときには、前記バックアップ給湯器から前記排熱回収熱交換器に至る通水路を形成するように通水路を切り換える通水路切換弁を備えることを特徴とする請求項１又は２に記載の燃料電池システム。   When the backup water heater heats water from the hot water storage tank, a water passage from the backup water heater to the exhaust heat recovery heat exchanger is shut off, and the backup water heater cools the water from the hot water storage tank. The fuel cell system according to claim 1, further comprising a water passage switching valve that switches the water passage so as to form a water passage from the backup water heater to the exhaust heat recovery heat exchanger. .
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003214705A (en) * 2002-01-25 2003-07-30 Chofu Seisakusho Co Ltd Cogeneration system
JP2007247968A (en) * 2006-03-15 2007-09-27 Osaka Gas Co Ltd Cogeneration system
JP2013134026A (en) * 2011-12-27 2013-07-08 Noritz Corp Cogeneration system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003214705A (en) * 2002-01-25 2003-07-30 Chofu Seisakusho Co Ltd Cogeneration system
JP2007247968A (en) * 2006-03-15 2007-09-27 Osaka Gas Co Ltd Cogeneration system
JP2013134026A (en) * 2011-12-27 2013-07-08 Noritz Corp Cogeneration system

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