KR101095665B1 - Fuel cull power generation system - Google Patents

Abstract

One embodiment of the present invention relates to a fuel cell power generation system that uses a reformed gas generated in a reformer and enables stable operation by minimizing pressure change factors in the system.

The fuel cell power generation system according to an embodiment of the present invention includes a reformer for converting a hydrocarbon-based power generation raw material into hydrogen, a first integrated heat exchanger provided in a reformer gas line of the reformer for flowing reformed gas, and an off gas flow. A second integrated heat exchanger provided in the off-gas line of the fuel cell stack, a third integrated heat exchanger provided in an air outlet line of the fuel cell stack to discharge air, and a combustion discharge of the reformer which discharges combustion discharge gas And a burner exhaust heat exchanger provided in the gas line, wherein the first integrated heat exchanger, the second integrated heat exchanger, the third integrated heat exchanger, and the burner exhaust heat exchanger are formed as an integrated module.

Heat Exchanger, Integral, Float Separator, Piping, Filling

Description

Fuel Cell Power Generation System {FUEL CULL POWER GENERATION SYSTEM}

The present invention relates to a fuel cell power generation system, and more particularly, to a fuel cell power generation system using reformed gas generated in a reformer.

As an example of a fuel cell power generation system, there may be mentioned a polymer electrolyte fuel cell power generation system. The fuel cell power generation system reacts hydrogen generated in the reformer with oxygen in the air electrochemically in the fuel cell stack to generate DC power, and converts DC power into AC power through an inverter.

9 is a block diagram of a fuel cell power generation system according to the prior art. 9, in the fuel cell power generation system, the reformer 1 includes a desulfurization catalyst unit 2, a reforming catalyst unit 3, a shift catalyst unit 4, a CO selective oxidation catalyst unit 5, and a burner unit. It includes (6). The reformer 1 is supplied with fuel and pure water for the reformer 1 to steam reforming. Water is supplied to the reformer 1 via a preheater 7 located between the shift catalyst section 4 and the CO selective oxidation catalyst section 5.

The reformed gas reformed in the reforming catalyst section 3 is fed to the CO selective oxidation catalyst section 5 via the preheat exchanger 7 and the stabilizing heat exchanger 8 through the shift catalyst section 4. . A cyclone separator 9a is used to separate the condensate produced in the preheat exchanger 7 and the stabilization heat exchanger 8.

That is, the reformed gas separated from the water separator 9a enters the CO selective oxidation catalyst unit 5, and the separated water is collected in a pipe and sensed by a water level sensor 11a that senses a certain level of water. It is discharged to the outside by an open operation. The water discharge method induces a change in pressure of the reformed gas by the volume of the discharged water, which is an unstable factor in the operation of the fuel cell power generation system. Since the catalysts 2, 3, 4, 5 of the reformer 1 react depending on the temperature under a constant pressure, it is advantageous to maintain the constant pressure in producing the reformed gas.

The rich hydrogen gas generated in the reformer 1 and the oxygen in the air are electrochemically reacted in the fuel cell stack 13, and the off gas, which is the remaining hydrogen gas other than the electrochemical reaction, is burner part of the reformer 1. After combustion in (6), it is discharged through the burner exhaust heat exchanger (19).

If the off gas has a lot of moisture, more energy is required to burn the moisture in the burner portion 6 of the reformer 1. Therefore, due to the influence of off-gas moisture, more city gas is supplied to the burner unit 6 so as to maintain a constant reactor temperature, thereby reducing the efficiency of the fuel cell power generation system. When the city gas supply supplied to the burner part 6 becomes unstable, the temperature of the steam reforming 1 is affected and the fuel cell power generation system as a whole becomes unstable. Therefore, in order to reduce the moisture of the off-gas, a separator 9b for separating the off-gas heat exchanger 15 and the condensed water is provided.

That is, the off gas separated from the separator 9b is supplied to the burner part 6 of the reformer 1 and combusted, and the separated condensate is detected by the water level sensor 11b that collects in a pipe and detects a certain level. It is discharged to the outside by the opening operation of the solenoid valve 12b. The water discharging method causes an unstable factor in the operation of the fuel cell power generation system by changing the pressure on the fuel cell stack 13 and the reformed gas by the volume of the discharged water.

In addition, the fuel cell stack 13 uses oxygen in the air, and water and surplus air generated after the reaction at the cathode of the fuel cell stack 13 are introduced into the air inlet of the fuel cell stack 13 through the membrane humidifier 17. Humidified by the dry air supplied to the remaining air and water passes through the water separator (9c) via the heat exchanger (16) to improve the heat recovery rate.

That is, the air separated from the separator 9c is discharged to the outside through the communication, and the separated water is collected in the pipe and sensed by the water level sensor 11c which detects a certain level and is opened by the opening operation of the solenoid valve 12c. It is recovered to the water tank inside the fuel cell power generation system and used as cooling water in the fuel cell stack 13. The water discharge method is an anxious element in the operation of the fuel cell power generation system because the flow rate fluctuation occurs by changing the pressure in the fuel cell stack 13 and the air by the volume of the discharged water.

In a fuel cell power generation system, the heat exchangers 7, 8, 15, 16 and the separators 9a, 9b, 9c cause pressure changes in the system, thus reducing the flow rate fluctuations in the fuel supply and air supply. It causes anxiety when driving. In addition, when the solenoid valves 12a, 12b, and 12c are unnecessarily opened due to a malfunction of the water level sensors 11a, 11b, and 11c, the reformed gas is discarded, so that the temperature balance between the reformer 1 and the fuel cell stack 13 is increased. The fuel cell power generation system becomes unstable.

In addition, since the plurality of heat exchangers 7, 8, 15, and 16 and the water separators 9a, 9b, and 9c are distributed in the pipe, the pipe becomes long and the configuration of the fuel cell power generation system becomes complicated. Therefore, there is a problem that heat loss is increased to reduce the heat recovery efficiency, and it is difficult to manufacture a fuel cell power generation system due to a complicated piping configuration, thereby lowering the production yield.

The present invention relates to a fuel cell power generation system using reformed gas generated in a reformer and enabling stable operation by minimizing pressure change factors in the system.

The present invention also relates to a fuel cell power generation system that integrates each heat exchanger and a corresponding water separator and improves heat recovery efficiency and improves productivity.

The fuel cell power generation system according to an embodiment of the present invention includes a reformer for converting a hydrocarbon-based power generation raw material into hydrogen, a first integrated heat exchanger provided in a reformer gas line of the reformer for flowing reformed gas, and an off gas flow. A second integrated heat exchanger provided in the off-gas line of the fuel cell stack, a third integrated heat exchanger provided in an air outlet line of the fuel cell stack to discharge air, and a combustion discharge of the reformer which discharges combustion discharge gas And a burner exhaust heat exchanger provided in the gas line, wherein the first integrated heat exchanger, the second integrated heat exchanger, the third integrated heat exchanger, and the burner exhaust heat exchanger are formed as an integrated module.

The first integrated heat exchanger, the second integrated heat exchanger, and the third integrated heat exchanger may each include a heat exchanger configured to circulate heat exchange by circulating coolant with one of the reformed gas, the off gas, and the air, and condensed by being connected to the heat exchanger. It includes a float type separator for intermittent discharge of the cooling water, the heat exchanger and the float type separator, are integrally formed, can be installed in a vertical state.

The first integrated heat exchanger, the second integrated heat exchanger, and the third integrated heat exchanger may include a pipe connected to the heat exchanger, a filler filled in the pipe, and a float separator connected to one side of the pipe. It may further include.

The module includes a first cooling water line connecting the first integrated heat exchanger, the second integrated heat exchanger, the third integrated heat exchanger, and the burner exhaust heat exchanger to a heat storage tank, wherein the first cooling water line includes: In the heat storage tank, the first cooling water may be circulated by connecting the first integrated heat exchanger, the second integrated heat exchanger, the third integrated heat exchanger, and the burner exhaust heat exchanger.

The module may further include a second cooling water line connected to the heat storage tank, a mixed cooling water line connecting the second cooling water line and the first cooling water line to each other and a heat exchanger for waste heat recovery and the heat storage tank. Can be.

The heat exchangers each include a corrugated pipe for flowing the first cooling water therein, and a cylindrical pipe formed around the corrugated pipe, and the float type separator may be integrally connected to the pipe.

The first integrated heat exchanger is located between the shift catalyst portion and the CO selective oxidation catalyst portion of the reformer, the preheat exchanger for preheating the water for reforming reaction, the stabilized heat exchanger to lower the temperature of the reforming gas, and the preheat exchanger And a float type separator separating the condensed water and the reformed gas from the stabilized heat exchanger.

The first integrated heat exchanger is connected to the preheat exchanger and the stabilization heat exchanger, the pipe to sufficiently reduce the flow rate of the reforming gas, the filling filled in the inside of the pipe and the float type separator connected to one side of the pipe It may further include.

The second integrated heat exchanger is located between the off gas line of the fuel cell stack and the burner portion of the reformer, and an air-cooled heat exchanger and a water-cooled heat exchanger that cool the off gas to remove water, and the air-cooled heat exchanger. The water-cooled heat exchanger may be integrally formed including a float type separator separating the off-gas and the water condensed.

The second integrated heat exchanger may further include a pipe connected to the water-cooled exchanger to sufficiently reduce the flow rate of the off gas, a filler filled in the pipe, and a float separator connected to one side of the pipe. .

The third integrated heat exchanger is located at the air outlet line of the fuel cell stack, and is a heat exchanger for condensing moisture generated after an electrochemical reaction in the fuel cell stack, and the water and the air condensed in the heat exchanger. It may include a float separator.

The second integrated heat exchanger may further include a pipe connected to the heat exchanger to sufficiently reduce the flow rate of the air, a filler filled in the inside of the pipe, and a float type separator connected to one side of the pipe.

The float separator is formed in the housing to house the condensed water flowing in, the floater is built up in the housing and lifted by buoyancy of the water, and formed in the lower side of the housing to control the discharge of the water by the lifting operation of the floater. It may include a water outlet.

As described above, according to one embodiment of the present invention, since the first, second, and third integrated heat exchangers provided in the reformed gas line, the off gas line, and the air outlet line are provided with a separator for separating condensed water, the fuel supply and This has the effect of minimizing pressure fluctuations in the air supply. Therefore, the electrochemical reaction is maintained stably in the reformer and fuel cell stack. Since the first, second and third integrated heat exchangers are configured as one module, the fuel cell power generation system can be stably operated, the heat recovery rate is increased, the assembly process during manufacturing is simplified, and the productivity is improved.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

1 is a configuration of a fuel cell power generation system according to an embodiment of the present invention. Referring to FIG. 1, a fuel cell power generation system includes a reformer 1, a fuel cell stack 13, and a complex heat exchanger module 100 (see FIGS. 2 and 3).

The reformer 1 is a desulfurization catalyst section 2, a reforming catalyst section 3, a shift catalyst section 4, a CO selective oxidation catalyst section 5, and a burner section 6 so as to convert hydrocarbon-based power generation raw materials into hydrogen. ).

FIG. 2 is a front side perspective view of the composite heat exchanger module 100 according to the first embodiment applied to FIG. 1, and FIG. 3 is a rear side perspective view of FIG. 2 and 3, the composite heat exchanger module 100 constitutes an integrated heat exchanger as a component of a fuel cell power generation system.

The composite heat exchange module 100 includes a first integrated heat exchanger 101, a second integrated heat exchanger 102, a third integrated heat exchanger 103, and a burner exhaust heat exchanger 19 to form an integrated module. . The first, second, and third integrated heat exchangers 101, 102, and 103 are each formed by integrating the heat exchanger and the separator together as one part.

The first integrated heat exchanger 101 is installed in the reforming gas line of the reformer 1 to supply the reformed gas from the shift catalyst section 4 to the CO selective oxidation catalyst section 5. The first integral heat exchanger 101 is configured by integrating the preheat exchanger 7, the stabilized heat exchanger 8, and the float type separator 10a. The first integrated heat exchanger 101 stably separates the reformed gas and the condensed water without fluctuations in pressure in the fuel cell stack 13 and the reformed gas line. The separated reformed gas is supplied to the CO oxidation catalyst unit 5 together with air, and the condensed water is recovered to a water tank (not shown).

The second integrated heat exchanger 102 is installed in the off-gas line of the fuel cell stack 13, and the off gas remaining in the fuel cell stack 13 for power generation is transferred to the burner part 6 of the reformer 1. Supply. The second integral heat exchanger 102 is configured by integrating the air-cooled heat exchanger 14, the water-cooled heat exchanger 15, and the float separator 10b. The second integrated heat exchanger 102 stably separates off gas and condensate without pressure fluctuations in the fuel cell stack 13 and the off gas line. The separated off gas is burned in the burner part 6 of the reformer 1, and the condensate is recovered to the water tank.

The third integrated heat exchanger 103 is installed in the air discharge line of the fuel cell stack 13 to recover a large amount of condensed water into an internal water tank (not shown) of the fuel cell power generation system. The third integrated heat exchanger 103 is configured by integrating the heat exchanger 16 and the float separator 10c. The third integrated heat exchanger 103 stably separates air and condensed water without fluctuations in pressure in the fuel cell stack 13 and the air discharge line. The separated gas is discharged to the outside, and the condensate is returned to the water tank.

FIG. 4 is a diagram illustrating a cooling water flow in the composite heat exchanger module of FIG. 2. Referring to FIG. 4, the heat generated in the fuel cell power generation system includes a first integrated heat exchanger 101 and a second integrated type within the composite heat exchange module 100 in the heat storage tank 23 through the first cooling water line 20. Heat exchanger for waste heat recovery from the heat storage tank 23 through the first coolant circulating through the heat exchanger 102, the third integrated heat exchanger 103, and the burner exhaust heat exchanger 19, and the second coolant line 21. The second cooling water entering 18 exchanges heat with the stack cooling water of the fuel cell stack 13 in the waste heat recovery heat exchanger 18 through the mixed cooling water via the mixed cooling water line 22. The second cooling water recovered from the heat exchanger 18 for waste heat recovery is stored in the heat storage tank 23 again.

The first integrated heat exchanger 101 generates high temperature heat in the fuel cell power generation system. That is, when the reforming gas enters the CO selective oxidation catalyst section 5 through the shift catalyst section 4, it passes through the first integrated heat exchanger 101. At this time, since the temperature of the reformed gas is 150 degrees Celsius or more, the first integrated heat exchanger 101 cools the temperature of the gas using cooling water.

Since the CO selective oxidation catalyst part 5 catalyzes the reaction at about 100 degrees C, catalyst deterioration occurs when a high-temperature reforming gas is supplied. Therefore, the first cooling water, which is the cooling water for heat output from the first integrated heat exchanger 101, with the heat recovered from the high-temperature reforming gas, is the water-cooled heat exchanger of the second integrated heat exchanger 102 through the first cooling water line 20. Pass through 15).

The second integrated heat exchanger 102 circulates the first cooling water of the first cooling water line 20 in the water-cooled heat exchanger 15 to cool off gas at 60 ° C or more with the air-cooled heat exchanger 14 to remove water. . The off gas from which moisture is removed is supplied to the burner part 6 of the reformer 1 to enable stable combustion.

The first cooling water of the first cooling water line 20 passing through the second integrated heat exchanger 102 is supplied to the third integrated heat exchanger 103 in the air discharge portion of the fuel cell stack 13. The air discharged from the fuel cell stack 13 is at least 60 degrees Celsius and contains an excessive amount of water as a product by an electrochemical reaction. Therefore, the third integrated heat exchanger 103 cools the air containing water by using the first cooling water of the first cooling water line 20 that has passed through the second integrated heat exchanger 102.

The water condensed in the third integrated heat exchanger 103 is recovered by the float type separator 10c and supplied to an internal water tank (not shown) of the fuel cell power generation system for recycling. The air from which moisture is removed from the third integrated heat exchanger 103 is discharged to the outside through the exhaust communication unit.

The first cooling water of the first cooling water line 20 circulating through the third integrated heat exchanger 103 passes through the burner exhaust heat exchanger 19 connected to the combustion gas discharge line of the burner part 6 of the reformer 1. The heat of the reformer 1 combustion exhaust gas of 60 degrees C or more is recovered.

That is, the first cooling water circulated through the first, second and third integrated heat exchangers 101, 102 and 103 and the burner exhaust heat exchanger 19 through the first cooling water line 20 is a heat exchanger for waste heat recovery. 18, heat is exchanged with the stack cooling water of the fuel cell stack 13.

Referring again to FIG. 1, the first integrated heat exchanger 101 is composed of a preheat exchanger 7, a stabilized heat exchanger 8, and a float separator 10a. And the first integrated heat exchanger 101 is a preheat exchanger 7, stabilization heat exchanger 8, cyclone separators 9a, 9b, 9c, water level sensors 11a, 11b, 11c in the prior art. And solenoid valves 12a, 12b, and 12c, serves to remove moisture from the reforming gas and to maintain the heat balance of the reformer 1.

Float type separator 10a is provided with a floater (floater) therein, and automatically discharges water when a certain level by the condensed water, the prior art water level sensors (11a, 11b, 11c) and solenoid valves The water is discharged as in the control operations 12a, 12b and 12c. The first integrated heat exchanger 101 is installed vertically to maintain the hot gas flowing from the top to the bottom.

The first integrated heat exchanger (101) is a pre-heater (7) having a function of preheating pure water for reforming reaction, and the temperature of the reformed gas entering the CO selective oxidation catalyst section (5). The stabilizer heat exchanger (stabilizer) 8, which serves to lower the temperature to a stable temperature, and the float type separator 10a are integrally formed.

Therefore, when the reformed gas containing water is cooled while passing through the preheat exchanger 7 and the stabilization heat exchanger 8, the condensate generated by the water flow decreases in the direction of gravity by decreasing the gas flow rate. Separate the reformed gas. The reformed gas from which the condensed water is separated enters the CO selective oxidation catalyst unit 5, and the condensed water is discharged into the water tank by the float type separator 10a.

As shown in FIG. 5, the float type separator 10a includes a housing 31 containing condensed water introduced therein, a floater 32 which is lifted by buoyancy of water when the product is built in the housing 31, and flows. It includes a water discharge port 33 formed on the lower side of the housing 31 to control the discharge of water by the lifting operation of the rotor 32.

That is, when the condensed water flows into the housing 31, the inner floater 32 floats due to the buoyancy of the water to open the water outlet 33, and the water is automatically discharged out of the housing 31. If there is no water condensed inside the float separator 10a, the floater 32 blocks the water outlet 33 by its own weight to prevent the reformed gas from leaking.

Accordingly, the float separator 10a of the first embodiment detects water through the water level sensors 11a, 11b, and 11c and eliminates the control operation of the prior art of controlling the solenoid valves 12a, 12b, and 12c. Make it possible.

In addition, the float type separator 10a continuously discharges the condensed water, thereby minimizing the pressure fluctuation of the reformed gas and reliably discharges water, thereby maintaining the reforming reaction stably and maintaining a constant flow of the material gas. To be.

In the first integrated heat exchanger (101), the preheat exchanger (7) and the stabilizing heat exchanger (8) each have a corrugated pipe (71) and a corrugated pipe (2) forming a flow path of the first coolant line (20) through which the internal first coolant is circulated. 71) a cylindrical tubing 81 formed around it. The first integrated heat exchanger 101 is formed by integrally connecting the float type separator 10a to the pipe 81.

The second integrated heat exchanger (102) is a reformer (1) via the air-cooled heat exchanger (14), the water-cooled heat exchanger (15), and the float water separator (10b) integrating the off gas of the fuel cell stack (13). Burner in the burner section 6 of the burner.

The second integrated heat exchanger 102 may be installed vertically. The off-gas is cooled through the air-cooled heat exchanger 14 to generate condensed water, and further cooled by passing through the water-cooled heat exchanger 15. Condensate is removed through the float separator 10b. The off gas from which water has been removed is burned in the burner part 6 to maintain a stable temperature balance of the reformer 1.

The air-cooled heat exchanger 14 cools the offgas using air, which is an oxidant of the fuel cell stack 13, and thereby humidifies the air side of the fuel cell stack 13 in the membrane humidifier 17 by using the recovered heat. Increase the effect.

Since the float type separator 10b operates in the same manner as the float type separator 10a of the first integrated heat exchanger 101, a detailed description thereof will be omitted.

The third integrated heat exchanger 103 humidifies the membrane humidifier 17 and discharges the remaining air to the outside. The outside air is humidified while passing through the air-cooled heat exchanger 14 and the membrane humidifier 17 and supplied to the cathode of the fuel cell stack 13. The membrane humidifier 17 has abundant moisture in the air discharged after the electrochemical reaction in the fuel electric stack 13, and serves to humidify the inlet-side air by using the abundant moisture at the outlet.

The third integrated heat exchanger 103 may be installed vertically. The third integrated heat exchanger (103) is a water-cooled heat exchange method to condense air containing moisture and discharge it to the outside in a state where the moisture is minimal. The condensed water is recovered to the water tank in the fuel cell power generation system through the float separator 10c and recycled as stack water and pure water for reforming reaction.

Since the float type separator 10c operates in the same manner as the float type separator 10a of the first integrated heat exchanger 101, detailed description thereof will also be omitted.

Compared with the prior art of Fig. 9, the first embodiment of the present invention provides a connection pipe for each of the heat exchangers 7, 8, 14, 15, 17 and 19 and the float separators 10a, 10b and 10c. Since the length is minimized, the heat loss in the pipe is low, that is, the heat recovery rate is high.

The composite heat exchange module 100 includes a first integrated heat exchanger 101, a second integrated heat exchanger 102, a third integrated heat exchanger 103, and a burner exhaust heat exchanger, in order to improve heat recovery. The first cooling water line 20 is formed to circulate the first cooling water in the order of the groups 19 (see FIG. 4).

The first integrated heat exchanger 101, the second integrated heat exchanger 102, and the third integrated heat exchanger 103 may be used to separate the water and the gas condensed by the first cooling water, respectively. And 10b, 10c).

Therefore, in constructing the fuel cell power generation system, the composite heat exchange module 100 simplifies the assembly process during manufacturing. The composite heat exchange module 100 is connected to a plurality of heat exchangers 7, 8, 15, and 16 and the separators 9a, 9b, and 9c disposed in the fuel cell power generation system of the prior art of FIG. 9. Integrating the components into one module reduces the number of components and makes unnecessary components such as the water level sensors 11a, 11b, 11c and solenoids 12a, 12b, 12c. Therefore, in the fuel cell power generation system of one embodiment, the configuration is simplified, power consumption is reduced, and productivity is improved.

Compared with the first embodiment, various embodiments of the present invention are described below. For the sake of convenience, the description of the similar or identical configurations to the first embodiment will be omitted.

FIG. 6 is a configuration diagram of a first integrated heat exchanger in the composite heat exchanger module according to the second embodiment applied to FIG. 1. In the second embodiment, the first integrated heat exchanger 101 ′ is configured in the first integrated heat exchanger 101 of the first embodiment, and includes a pipe 24 and a pipe 24 capable of sufficiently reducing the flow velocity. It further includes a float type separator 10a 'provided at one side of the filling 25 and the pipe 24 to be filled. The filler 25 may be formed of a mesh member.

The piping 24, the charge 25 and the float separator 10a 'can further block the condensed water from being supplied to the CO selective oxidation catalyst section 5, and the condensed water is separated from the float separator 10a. Discharged into the water tank.

FIG. 7 is a configuration diagram of a second integrated heat exchanger in the composite heat exchanger module according to the third embodiment of FIG. 1. In the third embodiment, the second integrated heat exchanger 102 'is provided in the configuration of the second integrated heat exchanger 102 of the first embodiment, in which the pipe 24 and the pipe 24 are capable of sufficiently reducing the flow rate. It further includes a float type separator 10b 'provided at one side of the filling 25 and the pipe 24 to be filled. The filler 25 may be formed of a mesh member.

Tubing 24, fill 25 and float separator 10b 'can further block condensed water from being fed to burner portion 6 of reformer 1, and the condensed water is separated from the float separator. Discharged at 10b '.

FIG. 8 is a configuration diagram of a third integrated heat exchanger in the composite heat exchanger module according to the fourth embodiment applied to FIG. 1. In the fourth embodiment, the third integrated heat exchanger 103 'is provided in the configuration of the third integrated heat exchanger 103 of the first embodiment, in which the pipe 24 and the pipe 24 are capable of sufficiently reducing the flow velocity. It further comprises a float type separator 10c 'provided at one side of the filling 25 and the pipe 24 to be filled. The filler 25 may be formed of a mesh member.

The pipe 24, the filling 25 and the float separator 10c 'can block the discharge of condensed water to the outside as much as possible, and the condensed water can be discharged from the fuel cell power generation system in the float separator 10c'. Is recovered to the internal cooling water tank.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

1 is a configuration of a fuel cell power generation system according to an embodiment of the present invention.

FIG. 2 is a front side perspective view of the composite heat exchanger module according to the first embodiment applied to FIG. 1.

3 is a rear side perspective view of FIG.

4 is a block diagram showing the flow of the first, second and mixed cooling water in the composite heat exchanger module of FIG.

5 is a block diagram of the float separator of FIG.

FIG. 6 is a configuration diagram of a first integrated heat exchanger in the composite heat exchanger module according to the second embodiment applied to FIG. 1.

FIG. 7 is a configuration diagram of a second integrated heat exchanger in the composite heat exchanger module according to the third embodiment of FIG. 1.

FIG. 8 is a configuration diagram of a third integrated heat exchanger in the composite heat exchanger module according to the fourth embodiment applied to FIG. 1.

9 is a block diagram of a fuel cell power generation system according to the prior art.

<Explanation of symbols for the main parts of the drawings>

100: composite heat exchanger module 1: reformer

2: desulfurization catalyst portion 3: reforming catalyst portion

4: shift catalyst part 5: CO selective oxidation catalyst part

6: burner part 7: preheat exchanger

8: stabilized heat exchanger 101, 101 ': first integral heat exchanger

102, 102 ': second integral heat exchanger 103, 103': third integral heat exchanger

10a, 10b, 10c, 10a ', 10b', 10c ': float type separator

19: burner exhaust heat exchanger 11b: float type separator

13 fuel cell stack 14 air-cooled heat exchanger

15: water-cooled heat exchanger 20, 21: first, second cooling water line

22: mixed cooling water line 23: heat storage tank

24: piping 25: filling

Claims (13)

A reformer for converting a hydrocarbon-based power generation raw material into hydrogen; A first integrated heat exchanger provided in the reforming gas line of the reformer for flowing reformed gas; A second integrated heat exchanger provided in an off gas line of the fuel cell stack for flowing off gas; A third integrated heat exchanger provided at an air outlet line of the fuel cell stack for discharging air; And A burner exhaust heat exchanger provided in the combustion exhaust gas line of the reformer for exhausting combustion exhaust gas, The first integrated heat exchanger, the second integrated heat exchanger, the third integrated heat exchanger and the burner exhaust heat exchanger, A fuel cell power generation system that is formed by an integrated module sequentially connected by the first cooling water line. The method according to claim 1, The first integrated heat exchanger, the second integrated heat exchanger, and the third integrated heat exchanger, respectively A heat exchanger configured to circulate heat exchange by cooling the coolant with one of the reformed gas, the off gas, and the air; It is connected to the heat exchanger and includes a float type separator for intermittent discharge of the cooling water, The heat exchanger and the float separator, A fuel cell power generation system integrally formed and installed in a vertical state. The method of claim 2, The first integrated heat exchanger, the second integrated heat exchanger, and the third integrated heat exchanger, A pipe connected to the heat exchanger, Filling filled in the inside of the pipe, and A fuel cell power generation system further comprising a float type separator connected to one side of the pipe. The method of claim 2, The first cooling water line, And a first integrated heat exchanger, a second integrated heat exchanger, a third integrated heat exchanger, and a burner exhaust heat exchanger in order to circulate the first cooling water in the heat storage tank. 5. The method of claim 4, The module, A second coolant line connected to the heat storage tank, and And a mixed cooling water line connecting the second cooling water line and the first cooling water line to each other to be connected to a heat exchanger for waste heat recovery and the heat storage tank. 6. The method of claim 5, The heat exchangers, Corrugated pipes each for flowing a first cooling water, It includes a cylindrical tubing formed around the corrugated pipe, A fuel cell system in which the float type separator is integrally connected to the pipe. The method according to claim 1, The first integrated heat exchanger, Located between the shift catalyst portion and the CO selective oxidation catalyst portion of the reformer, It includes a preheat exchanger for preheating the water for reforming reaction, a stabilized heat exchanger for lowering the temperature of the reformed gas, and a float type separator separating the condensed water and the reformed gas from the preheater and the stabilized heat exchanger. Fuel cell power generation system formed with. 8. The method of claim 7, The first integrated heat exchanger, A pipe connected to the preheater and the stabilized heat exchanger to sufficiently reduce the flow rate of the reformed gas; Filling filled in the inside of the pipe and A fuel cell power generation system further comprising a float type separator connected to one side of the pipe. The method according to claim 1, The second integrated heat exchanger, Located between the off gas line of the fuel cell stack and the burner portion of the reformer, A fuel cell integrally formed with an air-cooled heat exchanger and a water-cooled heat exchanger for cooling the off-gas to remove water, and a float type separator separating the off-gas and water condensed in the air-cooled heat exchanger and the water-cooled heat exchanger. Power generation system. The method of claim 9, The second integrated heat exchanger, A pipe connected to the water-cooled exchanger to sufficiently reduce the flow rate of the off gas, Filling filled in the inside of the pipe and A fuel cell power generation system further comprising a float type separator connected to one side of the pipe. The method according to claim 1, The third integrated heat exchanger, Located at the air outlet line of the fuel cell stack, Heat exchanger for condensing the water generated after the electrochemical reaction in the fuel cell stack, A fuel cell power generation system comprising a float type separator separating the air condensed in the heat exchanger and the air. The method of claim 10, The second integrated heat exchanger, A pipe connected to the heat exchanger to sufficiently reduce the flow rate of the air; Filling filled in the inside of the pipe and A fuel cell power generation system further comprising a float type separator connected to one side of the pipe. The method of claim 2, The float separator is, A housing containing the incoming condensate, A floater that is lifted up and down by buoyancy of water when it is introduced into the housing; And a water outlet formed in the lower side of the housing to control the discharge of water by the lifting operation of the floater.

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