JP2011119045A - Fuel battery system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel battery system that fills a fuel cell with cooling water for a short time without having air entrainment and secures heat exchanging performance satisfying initial setting performances, thereby achieving a stable power generation. <P>SOLUTION: In the fuel battery system, a circulation pump 6 and supply pump 11 are operated to fill the cooling water to a cooling water circulation circuit 2 at filling initial water in the fuel battery system. This structure shortens time to fill the initial water although the filling-water operation has ever been performed by using only a cooling pump for cooling a fuel battery. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fuel cell system.

  A polymer electrolyte fuel cell (hereinafter abbreviated as “fuel cell”) using a polymer electrolyte membrane as an electrolyte is incorporated in a fuel cell system. This fuel cell generates electricity by an electrochemical reaction that is an exothermic reaction between hydrogen in fuel gas containing hydrogen gas as a main component and oxygen in air. The fuel gas is obtained, for example, by steam reforming a hydrocarbon gas such as city gas.

  In the power generation of the fuel cell, the above-described electrochemical reaction (exothermic reaction) proceeds, so that the operating temperature during power generation of the fuel cell is maintained at a temperature suitable for the reaction (for example, about 70 ° C. to 80 ° C.). Thus, a mechanism for keeping the internal temperature of the fuel cell constant is generally employed.

  For example, a cooling water path through which cooling water flows is arranged in the fuel cell, and the internal temperature of the fuel cell is adjusted by controlling the flow rate of the cooling water flowing through the path. On the other hand, if the heat medium recovers the heat of the high-temperature cooling water that has passed through the fuel cell by heat exchange and is stored in the heat accumulator, the heat can be stored in the fuel cell system (for example, Patent Document 1).

  FIG. 5 shows an exhaust heat recovery device mounted on a fuel cell system disclosed in Patent Document 1. As shown in FIG.

  In FIG. 5, the cooling water in the stack cooling water tank 3 is circulated from the fuel cell stack 2 through the heat exchanger 8 to the stack cooling water tank 3 again by the stack circulation pump 4.

  Further, hydrogen discharged from the hydrogen production apparatus 1 passes through the heat exchanger 9, passes through the anode electrode of the fuel cell stack 2, undergoes an electrochemical reaction (exothermic reaction), passes through the heat exchanger 6, and is discharged outside the apparatus.

  On the other hand, the exhaust heat recovery water is conveyed to the heat exchanger 8 by the exhaust heat recovery water pump 5. The amount of heat generated by the power generation in the fuel cell stack 2 is heat-exchanged by the heat exchanger 8 and is recovered as hot water in a hot water storage tank (not shown).

Japanese Patent Laid-Open No. 2005-100903

  However, in the conventional configuration, when the cooling water is filled into the cooling water tank 3 and the cooling water portion of the fuel cell stack 2 by the circulation pump 4 in the initial stage of operation (hereinafter referred to as initial water filling), the cooling water is often filled. There was a problem that it took a long time.

That is, the circulation pump 4 circulates the cooling water so that the operating temperature of the fuel cell during power generation is maintained at a temperature suitable for the reaction. This circulation amount needs to be controlled to a very small amount, so that the circulation pump 4 cannot use a high pump. In addition, in order to withstand continuous use, it is necessary to use a durable centrifugal pump that does not have a self-sufficiency but is durable.
And since the cooling water is filled into the cooling water tank 3 and the cooling water portion of the fuel cell stack 2 using the circulation pump 4, the cooling water of the circulation pump 4 is filled by the natural fall of the stored water from the cooling tank. Operate the circulation pump. For both reasons, it took a lot of time to complete the filling of the circulating cooling water.

  Further, since the circulating pump has a low head, the cooling water tank 3 and the cooling water portion of the fuel cell stack 2 are not sufficiently filled using the circulating pump 4, and so-called air biting occurs. The problem that the sufficient cooling effect of the fuel cell stack 2 cannot be obtained and the problem that cavitation occurs in the pump and the durability of the pump is lowered have been combined.

  In view of the above problems, the present invention shortens the initial water filling time to a cooling circuit used in a fuel cell system and the like, thereby realizing a reduction in power generation start time and preventing air biting in the cooling circuit, The object is to provide a fuel cell system that is easy to use and has excellent durability.

  In order to solve the conventional problems, the fuel cell system according to the present invention has a self-sufficiency capability of injecting water into a fuel cell cooling circulation pump and a fuel processor circuit that do not have a self-sufficiency capability during initial filling of the fuel cell cooling circuit. A certain supply pump is operated. The circulating pump for cooling the fuel cell in the fuel cell cooling circuit is filled with cooling water by the supply pump having self-sufficiency. That is, it is possible to assist the filling of the cooling water of the circulation pump 4 by the natural fall of the stored water from the cooling tank. Thereby, the circulating operation of the cooling water pump can be performed at an early stage, and the initial water filling time can be shortened.

  In the fuel cell system of the present invention, the cooling pump for cooling the fuel cell and the supply pump are simultaneously operated at the time of initial water filling. According to this method, the operation of the circulation pump is started without waiting for the cooling water of the circulation pump to be filled by the operation of the supply pump. As a result, the initial water filling by the circulation pump is started immediately after the completion of the filling of the cooling water of the circulation pump rather than the method of operating the circulation pump waiting for the cooling water of the circulation pump to be filled. It can be carried out.

  In the fuel cell system of the present invention, the cooling pump for cooling the fuel cell and the supply pump are alternately operated during initial water filling. According to this method, the initial water filling by the supply pump and the initial water filling by the circulation pump are alternately performed. By performing the initial water filling a plurality of times as described above, it is possible to sufficiently vent the air in the cooling water circuit, which could not be sufficiently performed by one initial water filling, and it is possible to perform the water filling without air biting. By eliminating the air bite, a sufficient cooling effect of the fuel cell stack 2 can be obtained, cavitation does not occur, and the durability of the pump can be improved.

  The fuel cell system of the present invention shortens the initial water filling time to the cooling circuit used in the fuel cell system and the like, realizes shortening of the power generation start time, prevents air from being caught in the cooling circuit, and Thus, it is possible to provide a fuel cell system that can obtain a sufficient cooling effect and can improve the durability of the pump without causing cavitation.

1 is a configuration diagram showing a fuel cell system according to Embodiment 1 of the present invention. The flowchart which shows the sequence of the fuel cell system in Embodiment 1 of this invention. The flowchart which shows the sequence of the fuel cell system in Embodiment 2 of this invention. The flowchart which shows the sequence of the fuel cell system in Embodiment 3 of this invention. Configuration diagram showing a conventional fuel cell system

  The first invention includes a fuel cell, a cooling water circulation circuit that circulates cooling water for cooling the fuel cell, a cooling water tank that includes a heater provided in the cooling water circulation circuit and stores cooling water, and A low-circulation circulation pump with no self-sufficiency that circulates cooling water in the cooling water circulation circuit, a heat exchanger that absorbs waste heat from the cooling water circulation circuit and stores it in the hot water storage tank, and a branch from the cooling water tank. A fuel cell system having a water supply circuit for supplying water for reaction via a supply pump having a self-supply capability to the fuel processor, and operating the circulation pump and the supply pump when the fuel cell system is initially filled with water Then, the fuel cell system is characterized in that the cooling water is filled into the cooling water circulation circuit, and assists the filling of the cooling water of the circulation pump by the head difference of the stored water from the cooling water tank. It is possible. With this configuration, it is possible to shorten the initial water filling time, which is conventionally performed only with the cooling pump for cooling the fuel cell.

  According to a second aspect of the present invention, there is provided a fuel cell system wherein the circulating pump and the supply pump are simultaneously operated when charging the cooling water into the cooling water circulation circuit of the fuel cell system according to the first aspect of the invention. The operation of the circulation pump is started without waiting for the cooling water of the circulation pump to be filled by the operation of the supply pump. As a result, the initial water filling by the circulation pump is started immediately after the completion of the filling of the cooling water of the circulation pump rather than the method of operating the circulation pump waiting for the cooling water of the circulation pump to be filled. It can be carried out.

  A third invention is a fuel cell system wherein the circulation pump and the supply pump are alternately operated when filling the cooling water into the cooling water circulation circuit of the fuel cell system of the first invention. . According to this method, the initial water filling by the supply pump and the initial water filling by the circulation pump are alternately performed. By performing a plurality of times as described above, air can be sufficiently removed from the cooling water circuit, which cannot be sufficiently obtained by one initial water filling, and water filling without air biting can be performed. By eliminating the air bite, cavitation does not occur in the pump, and the durability of the pump can be improved. Further, by eliminating the air bite, it is possible to obtain a sufficient cooling effect of the fuel cell and the heat exchanger by filling the cooling circuit with cooling water.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows the configuration of the fuel cell system according to the first embodiment of the present invention, and FIG. 2 is a flowchart showing an initial water filling sequence.

  Hereinafter, specific configuration examples and operation examples of the fuel cell system according to the embodiment of the present invention will be described with reference to the drawings based on flowcharts showing the configuration example and sequence of the fuel cell system.

  FIG. 1 is a block diagram showing a configuration example of a fuel cell system according to an embodiment of the present invention.

  As shown in FIG. 1, a fuel cell system 100 is a fuel cell that generates hydrogen by generating a reforming reaction between a fuel cell 1 that generates and generates heat using fuel gas (hydrogen gas) and methane in the combustion gas. A machine 10 is provided.

  In the fuel cell 1, the fuel gas supplied to the anode (not shown) of the fuel cell 1 and the oxidizing gas (for example, air) supplied to the cathode (not shown) of the fuel cell 1 are electrochemical. In response to heat (exothermic reaction), power and heat are generated. The electric power generated by the fuel cell 1 can be used in various electric devices, for example. Further, the heat generated by the fuel cell 1 can be used for various purposes, for example, at home heating or hot water supply.

  The internal structure of the fuel cell 1 is known. Therefore, the detailed description is abbreviate | omitted. In the power generation of the fuel cell 1, since the above-described electrochemical reaction (exothermic reaction) proceeds, the operating temperature during power generation of the fuel cell 1 is maintained at a temperature suitable for the reaction (for example, about 70 ° C. to 80 ° C.). In general, a mechanism for keeping the temperature of the fuel cell 1 constant is generally employed.

  First, the fuel cell cooling circuit will be described.

  As shown in FIG. 1, the fuel cell cooling circuit includes a cooling water circulation circuit 2 that circulates cooling water for cooling the fuel cell 1 during power generation of the fuel cell 1, and a heater provided in the cooling water circulation circuit 2. 3, a cooling water tank 4 that stores cooling water, a circulation pump 6 that circulates the cooling water in the cooling water circulation circuit 2, and absorbs waste heat of the cooling water circulation circuit 2 to store heat in the hot water storage tank 20. A heat exchanger 5 and a temperature detector 7 provided at the cooling water outlet of the fuel cell 1 are provided. In FIG. 1, the flow direction of the cooling water is indicated by a solid arrow. The cooling water circulation circuit 2 includes a cooling water circulation circuit a21 that connects the cooling water tank 4 and the heat exchanger 5, a cooling water circulation circuit b22 that connects the heat exchanger 5 and the fuel cell 1, and a cooling water circulation that connects the fuel cell 1 and the circulation pump 6. A circuit c23 and a cooling water circulation circuit d24 connecting the circulation pump 6 and the cooling tank 4 are configured.

  Next, a reformed water supply circuit for supplying reaction water for the reforming reaction to the fuel processor 10 for supplying fuel gas (hydrogen gas) using city gas or the like to the fuel cell 1 will be described.

  The reforming water supply circuit includes a water supply circuit 12 branched from the cooling water circulation circuit d24 of the cooling water circulation circuit 2, a supply pump 11 for supplying reaction water to the fuel processor, and water for reaction to the fuel processor 10. And a condensate water circuit 14 branched from the supply pump 11, a fuel processing valve b15b, a condensate water tank 16, a cooling water supply pump 13, and a cooling water supply circuit 17b. . In FIG. 1, the flow direction of the cooling water is indicated by dotted arrows. The water supply circuit 12 is branched from a cooling water circulation circuit c24 that connects the fuel cell 1 and the circulation pump 6, and a water supply circuit a that connects the supply pump 11, a water supply circuit b32 that connects the supply pump 11 and the fuel processing valve a15a, a fuel A water supply circuit c33 connecting the processing valve a15a and the fuel processor 10, a water supply circuit d34 branching from the water supply circuit b32 and connecting the fuel processing valve b15b, and a water supply circuit e35 connecting the fuel processing valve b15b and the condensed water tank 16. It consists of

  The cooling water supply circuit 17b includes a cooling water supply circuit c17c, a cooling water supply circuit d17d, and a cooling water supply circuit e17e.

  Next, the fuel cell power generation process will be described in the order of water flow, circulating water filling operation of the circulation circuit (hereinafter, water-filled) fuel treatment, and fuel cell power generation.

  Water filling is performed to fill the circulation circuit of the fuel cell system with water.

  First, water is supplied to the condensed water tank 16. The hot water circulation pump 21 is operated, the condensate tank valve 22 is opened, and the water in the hot water tank 20 is separated from the hot water circulation circuit 41, the hot water circulation pump 21, the hot water circulation circuit b42, the condensed water circuit a51, and the condensed water. The condensed water tank 16 is replenished via the circuit b52. When the water level in the condensed water tank 16 rises, the condensed water tank level switch 17 detects full water, stops the hot water circulation pump 21 and closes the condensed water tank valve 22 (step S1).

  Next, cooling water is supplied to the cooling water tank 4. First, the cooling water supply pump 13 is operated. Accordingly, the water stored in the condensed water tank 16 is guided to the cooling water tank 4 through the cooling water supply circuit c17c, the cooling water supply circuit d17d, the ion exchange resin 18, and the cooling water supply circuit e17e. When the water level in the cooling water tank 4 rises, the cooling water tank level switch 8 detects full water and stops the cooling water supply pump 13. When the water stored in the condensed water tank 16 is reduced for replenishing the cooling water to the cooling water tank 4, the condensed water tank level switch 17 detects the reduced water and returns to the condensed water tank 16 again. Water is replenished (step S2).

  When the cooling water is replenished into the cooling tank 4, the cooling water passes through the cooling water circulation circuit a <b> 21, the heat exchanger 5, and the fuel cell 1, and is charged into the circulation pump due to a water head difference.

  At this time, the fuel processing valve b15b is opened and the supply pump 11 having a self-supply capability is operated to assist the filling of the circulation pump 6 with the water head difference (steps S3 and S5). At this time, the cooling water supplied from the cooling tank 4 by the operation of the supply pump 11 is discharged to the condensing tank 16, and when the water stored in the condensing water tank 16 exceeds a certain amount, it is discharged from the overflow 16b to the outside of the apparatus. Then, the circulation pump 6 is operated after completion of filling of the water in the circulation pump by a timer or the like (steps S4, S6, S7, S8, S9). Since the circulation pump 6 is filled with cooling water, the cooling water in the cooling water circulation circuit 2 can be circulated without any problem. Then, when the timer is completed, the operation of the circulation pump is stopped (steps S10, S11, S12).

  By the operation of the circulation pump 6, the cooling water in the cooling water tank 4 circulates through the heat exchanger 5 and the fuel cell 1 and is circulated again to the cooling water tank 4. When the cooling water tank level switch 8 detects a decrease in the cooling water tank 4 during the process of filling the cooling water circulation circuit 2 with the cooling water, the replenishing water to the cooling water tank 4 is performed again.

  In addition, after completion of the process of filling the cooling water circulation circuit 2 with the cooling water, the fuel processor 10 causes the reforming reaction with methane in the combustion gas from the cooling water tank 4 to generate the hydrogen for the reaction. Supply water. That is, the fuel processing valve a15a is opened, the supply pump 11 is operated, and the fuel processing valve 10 is guided.

  When filling of the cooling water in the cooling water circulation circuit 2 is completed, fuel gas (hydrogen gas) is supplied from the fuel processor 10 to the fuel cell 1 and reacts with the oxidizing gas (for example, air) to start power generation. . Then, electric power and heat are generated by this power generation. This electric power is consumed by the electric equipment, and the generated heat is heat-exchanged by the heat exchanger 5 from the hot water storage tank 20 by the hot water circulation circuit 21 by the hot water storage circuit 22 and is stored in the hot water storage tank 20.

  The hot water storage circuit 22 includes a hot water storage circuit a 41 that connects the hot water tank 20 and the hot water storage pump 21, a hot water storage circuit b 42 that connects the hot water storage pump 21 and the heat exchanger 5, and hot water that connects the heat exchanger 5 and the hot water tank 20. It comprises a circulation circuit c43.

Further, when surplus electricity is generated during power generation in the fuel cell system, the surplus power is converted into heat by a heater and stored in the hot water tank 20. Specifically, surplus power is converted into hot water by the surplus heater 3 provided in the cooling water tank 4. Hot water in the cooling water tank is sent to the heat exchanger 5 by the circulation pump 6, and heat is exchanged from the hot water storage tank 20 by the hot water circulating through the hot water storage circuit 22 by the hot water storage circulation pump 21 to be stored in the hot water storage tank 20. The circulation pump 6 cannot be installed directly below the cooling water tank 6 because the water stored in the cooling water tank 4 heated by the surplus heater 3 becomes high temperature, and the cooling water downstream from the heat exchanger 5 and the fuel cell 1. Installed at a position sufficiently away from the tank 6.

  As described above, according to the cooling water circulation circuit in the configured fuel cell system, when the cooling water circulation circuit 2 is filled with the cooling water, the two of the circulation pump 6 and the supply pump 11 are used to invent the invention. However, the supply pump 11 compensates for the weak point of the low-pump circulation pump 6 described in the problem to be solved, thereby reducing the time required for the conventional process of filling the cooling water circulation circuit 2 with the cooling water. As a result, the power generation start time of the fuel cell can be shortened.

(Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to FIG. 1 and a flowchart FIG. 3 showing a sequence of initial water filling.

  The description of the order of the power generation process of the fuel cell, water flow, circulating water filling operation of the circulation circuit, fuel processing, and power generation of the fuel cell is the same as (Embodiment 1), and is therefore omitted. This embodiment is characterized by the operation timing of the circulation pump 6 and the supply pump 11.

  When charging the cooling water into the cooling water circulation circuit of the fuel cell system described in the first embodiment, the circulation pump 6 having a low head and having no self-supply capability and the supply pump 11 having a self-supply capability are simultaneously operated. That is, the operation of the circulation pump is started simultaneously without waiting for the cooling water of the circulation pump to be filled by the operation of the supply pump 11. As a result, the initial pumping by the circulation pump is performed immediately after completion of the filling of the cooling water of the circulation pump due to the water head difference described in the first embodiment, rather than the method of operating the circulation pump after waiting for the cooling water of the circulation pump to be filled. Therefore, initial water filling without time lag can be performed.

  First, initial water filling is performed on the condensed water tank 16 and the cooling water tank 4 (steps S21 and S22). Next, the fuel processing valve b15b is opened (step S23).

  Next, the supply pump 11 and the circulation pump 6 are operated simultaneously (step S25).

  Then, upon completion of the timer, the fuel processing valve b15b is closed and the operation of the circulation pump is stopped (steps S27 and S28).

  The heat exchanger 5 and the fuel cell 1 have a great water resistance in order to obtain their performance. In particular, as described in the first embodiment, when surplus electricity is generated during power generation, the surplus power is converted into heat by a heater and stored in the hot water tank 20. Specifically, surplus power is converted into high-temperature water by the surplus heater 3 provided in the cooling water tank 4. For this reason, when the circulation pump 6 is installed at a position downstream of the cooling water tank 4, the heat exchanger 5, and the fuel cell 1 so as not to be affected by the stored water of the cooling water tank 4 that is heated by the surplus heater 3. The effect will be noticeable. Also in response to this problem, a process of filling the cooling water circulation circuit 2 with cooling water by simultaneously using a pump having a high self-sufficiency as the supply pump 11 and sucking water stored in the cooling water tank 4 at a high head. At this time, the air exchange of the heat exchanger 5 and the cooling water circuit in the fuel cell 1 can be prevented, so that sufficient heat exchange performance satisfying the initial setting performance can be ensured.

(Embodiment 3)
Next, a third embodiment of the present invention will be described with reference to FIG. 1 and a flowchart of FIG. 4 showing an initial water filling sequence.

  The description of the order of the power generation process of the fuel cell, water flow, circulating water filling operation of the circulation circuit, fuel processing, and power generation of the fuel cell is the same as (Embodiment 1), and is therefore omitted. This embodiment is characterized by the operation timing of the circulation pump 6 and the supply pump 11.

  When charging the cooling water into the cooling water circulation circuit of the fuel cell system described in the first embodiment, the circulation pump 6 having a low head and having no self-supply capability and the supply pump 11 having a self-supply capability are alternately operated. This is a fuel cell system.

  When the condensed water tank 16 and the cooling tank 4 are replenished with cooling water, the cooling water passes through the cooling water circulation circuit a21, the heat exchanger 5 and the fuel cell 1 and is charged into the circulation pump by the head difference (step S41, S42).

  At this time, the fuel processing valve b15b is set to “open” to operate the supply pump 11 having a self-sufficiency and assist the filling of the circulating pump 6 with the stored water by the water head difference. At this time, the cooling water supplied from the cooling tank 4 by the operation of the supply pump 11 is discharged to the condensation tank 16 (steps S43, S45). Then, after completion of filling of the water in the circulation pump 6 by a timer or the like, the fuel processing valve b15b is closed and the operation of the supply pump 11 is stopped (steps S44, S46, S47, S48). (Step S49). Then, after a predetermined time elapses, the circulation pump 6 is stopped (Steps S50, S51, S52).

  Thereafter, the operation cycle of the supply pump 11 and the circulation pump 6 is implemented again. That is, the supply pump 11 is operated again, the operation of the supply pump 11 is stopped by waiting for completion of filling of water in the circulation pump 6 by the timer or the like, and the operation of the circulation pump 6 is performed (steps S61 to S70).

  According to this method, the initial water filling by the supply pump 11 and the initial water filling by the circulation pump 6 are performed alternately. By alternately performing the initial water filling as described above, the air in the cooling water circuit, which cannot be sufficiently obtained by one initial water filling, can be sufficiently removed, and the water filling without air biting can be performed. By eliminating the air bite, cavitation does not occur in the pump, and the durability of the pump can be improved. Further, by eliminating the air bite, it is possible to obtain a sufficient cooling effect of the fuel cell by filling the cooling circuit with cooling water.

  The operation cycle of the supply pump 11 and the circulation pump 6 can be repeated several more times to take a more complete countermeasure against air biting.

The heat exchanger 5 and the fuel cell 1 have a large water flow resistance in order to obtain their performance. In particular, when a plate-type heat exchanger is adopted as the heat exchanger 5, the effect becomes remarkable. The plate heat exchanger is a heat exchanger having a structure in which heat transfer plates press-molded into a concavo-convex shape are stacked so that each fluid flows alternately. For this reason, when a plurality of plates are combined, if the capacity of the circulation pump 6 is low, all the plates are not filled with cooling water, and a predetermined heat transfer performance cannot be obtained. In particular, as described in the first embodiment, when surplus electricity is generated during power generation, the surplus power is converted into heat by a heater and stored in the hot water tank 20. Specifically, surplus power is converted into high-temperature water by the surplus heater 3 provided in the cooling water tank 4. Therefore, when the circulation pump 6 is installed downstream of the cooling water tank 4, the heat exchanger 5, and the fuel cell 1 so as not to be affected by the cooling water of the cooling water tank 4 that is heated by the excess heater 3, the Will be affected.

  Also for this problem, a pump having a high self-sufficiency is used as the supply pump 11, the supply pump 11 is operated before the circulation pump 6 is operated, and the cooling water in the cooling water tank 4 is supplied to the heat exchanger 5. I will guide you. After the operation of the supply pump 11 for a certain time, the circulation pump 6 is operated for a certain time. By repeating this cycle alternately, the water stored in the cooling water tank 4 is gradually filled with the cooling water circulation circuit 2, the heat exchanger 5, and the fuel cell 1, and finally the cooling water circulation circuit 2 is filled with cooling water. can do. Then, when the cooling water circuit 2 is filled with cooling water, it is possible to prevent air biting and ensure sufficient heat exchange performance that satisfies the initial setting performance.

  As described above, the fuel cell system according to the present invention can fill the cooling water circulation circuit, the heat exchanger, and the fuel cell with cooling water without biting air, thereby ensuring sufficient heat exchange performance that satisfies the initial setting performance. A fuel cell system capable of performing stable power generation can be provided.

DESCRIPTION OF SYMBOLS 1 Fuel cell 2 Cooling water circulation circuit 3 Surplus heater 4 Cooling water tank 5 Heat exchanger 6 Circulation pump 7 Temperature detector 8 Cooling water tank level switch 10 Fuel processor 11 Supply pump 12 Water supply circuit 13 Cooling water supply pump 14 Condensate water circuit 15a Fuel processing valve 1
15b Fuel treatment valve 2
16 Condensate tank 16b Overflow 17 Condensate tank level switch 17b Cooling water supply circuit 18 Ion exchange resin 20 Hot water tank 21 Hot water circulation pump 22 Hot water circulation circuit

Claims (3)

A fuel cell, a cooling water circulation circuit for circulating cooling water for cooling the fuel cell, a cooling water tank provided with a heater provided in the cooling water circulation circuit for storing cooling water, and cooling in the cooling water circulation circuit A circulation pump for circulating water, a heat exchanger that absorbs waste heat from the cooling water circulation circuit and stores the heat in a hot water storage tank, and a reaction branch branched from the cooling water tank to a fuel processor via a supply pump A fuel cell system having a water supply circuit for supplying water, wherein the circulating pump and the supply pump are operated during initial water filling of the fuel cell system to fill the cooling water circulation circuit with cooling water. A fuel cell system. 2. The fuel cell system according to claim 1, wherein when the cooling water is charged into the cooling water circulation circuit of the fuel cell system, the circulation pump and the supply pump are operated simultaneously. 2. The fuel cell system according to claim 1, wherein when the cooling water is charged into the cooling water circulation circuit of the fuel cell system, the circulation pump and the supply pump are alternately operated.

Images