Cogeneration system and method for coupling fuel cell-thermoelectric refrigeration-membrane distillation

Abstract

The invention discloses a multi-energy supply system and method coupled with a fuel cell-thermoelectric cooling-membrane distillation system, comprising: a fuel cell module, a thermoelectric generator module, a membrane distillation module and a plurality of thermoelectric refrigerator modules; the fuel cell module, the thermoelectric generator module and the first thermoelectric refrigerator module are connected in sequence, the coolant of the fuel cell module stack with waste heat passes through the thermoelectric generator module and the first thermoelectric refrigerator module in sequence for cooling, and then enters the fuel cell module again to circulate and cool the stack; the membrane distillation module comprises at least one membrane distillation component, a feed liquid tank and a permeate liquid tank, the feed liquid outlet of the feed liquid tank is connected in sequence to the hot side of the second thermoelectric refrigerator module, the third thermoelectric refrigerator module and the first thermoelectric refrigerator module, and the high-temperature feed liquid inlet of each membrane distillation component; the permeate liquid outlet of the membrane distillation component is connected in sequence to the cold side of the second thermoelectric refrigerator module and the permeate liquid tank, and the permeate liquid tank is connected to a fresh water user.

Description

Technical Field

[0001] The present invention relates to the technical field of renewable energy utilization and energy system, and in particular to a multi-generation system and method coupled with a fuel cell-thermoelectric refrigeration-membrane distillation. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Hydrogen energy is a reliable energy carrier that can ensure the continuity of energy output from renewable energy sources such as solar energy and wind energy, and is expected to become one of the important alternative energy sources to traditional fossil energy.

[0004] Proton exchange membrane fuel cell (PEMFC) is a high-efficiency and clean power generation technology with development potential. Due to its advantages such as low operating temperature, fast start-up and high specific power, it can be widely used in residential, automotive and mobile power supply fields.

[0005] PEMFC generates heat while generating electricity. Traditional cooling systems (including radiators and electric fans) need to consume additional electricity to manage the thermal performance of the PEMFC stack, which makes it impossible to effectively utilize the low-temperature waste heat generated by the PEMFC stack and requires direct discharge, thus reducing the efficiency of PEMFC and being detrimental to energy conservation.

[0006] The existing multi-generation systems mostly use fossil energy. According to the principle of energy cascade utilization, high-grade energy is used for power generation and low-grade energy is used for heating or cooling. This can not only meet the needs of users for various energy forms, but also improve energy utilization efficiency.

[0007] However, existing multi-generation systems often have problems such as complex structure, difficulty in system matching, slow startup and complex operation and management. Summary of the invention

[0008] In order to solve the above problems, the present invention proposes a multi-generation system and method coupling fuel cell-thermoelectric refrigeration-membrane distillation, which integrates proton exchange membrane fuel cells, thermoelectric refrigerators, thermoelectric generators and membrane distillation into one, has the characteristics of high modularity, and can simply connect single or multiple devices in the multi-generation system in series and parallel to form a multi-stage system, which can instantly meet the needs of different working conditions and achieve the purpose of providing drinkable fresh water, cold, heat, electricity and energy saving and consumption reduction.

[0009] In some embodiments, the following technical solutions are adopted:

[0010] A multi-generation system coupled with a fuel cell, a thermoelectric refrigeration, and a membrane distillation, comprising: a fuel cell module, a thermoelectric generator module, a membrane distillation module, and a plurality of thermoelectric refrigerator modules;

[0011] The fuel cell module, the thermoelectric generator module and the first thermoelectric cooler module are connected in sequence. The coolant of the fuel cell module stack with waste heat passes through the thermoelectric generator module and the first thermoelectric cooler module in sequence to cool down the stack, and then enters the fuel cell module again to circulate and cool the stack. The thermoelectric generator module absorbs the waste heat of the coolant and converts it into electrical energy to power users and other modules.

[0012] The membrane distillation module includes at least one membrane distillation component, a feed liquid tank and a permeate liquid tank. The feed liquid outlet of the feed liquid tank is connected to the hot side of the second thermoelectric refrigerator module, the third thermoelectric refrigerator module and the first thermoelectric refrigerator module and the high-temperature feed liquid inlet of each membrane distillation component in sequence; the permeate liquid outlet of the membrane distillation component is connected to the cold side of the second thermoelectric refrigerator module and the permeate liquid tank in sequence, and the permeate liquid tank is connected to the fresh water user.

[0013] Each stage of membrane distillation assembly is also connected to the hot side of the fourth thermoelectric refrigerator module and the cold side of the third thermoelectric refrigerator module in sequence. The cold side of the third thermoelectric refrigerator module is connected to the feed liquid tank to form a feed liquid circulation; the cold side of the fourth thermoelectric refrigerator module provides cold energy for users.

[0014] Each stage of membrane distillation assembly is also connected to the cold side of the fifth thermoelectric refrigerator module and the cold side of the third thermoelectric refrigerator module in sequence. The cold side of the third thermoelectric refrigerator module is connected to the feed liquid tank to form a feed liquid circulation; the hot side of the fifth thermoelectric refrigerator module provides thermal energy for users.

[0015] In other embodiments, the following technical solutions are adopted:

[0016] A multi-generation method coupling fuel cell-thermoelectric refrigeration-membrane distillation, comprising:

[0017] The coolant of the fuel cell module stack with waste heat passes through the thermoelectric generator module and the first thermoelectric cooler module to cool down the stack, and then enters the fuel cell module again to circulate and cool the stack; the thermoelectric generator module absorbs the waste heat of the coolant and converts it into electrical energy to supply power to users and other modules;

[0018] The feed liquid in the membrane distillation module feed liquid tank is heated by the second thermoelectric refrigerator module, the third thermoelectric refrigerator module and the first thermoelectric refrigerator module in sequence and then enters the membrane distillation component of the membrane distillation module. The permeate of the membrane distillation component is cooled by the second thermoelectric refrigerator module and then enters the permeate tank to provide fresh water for users.

[0019] The high-temperature feed liquid from at least one membrane distillation component is heated by the fourth thermoelectric refrigerator module, and then cooled by the third thermoelectric refrigerator module before flowing back to the feed liquid tank to form a feed liquid cycle; at the same time, the cold energy generated by the fourth thermoelectric refrigerator module is provided to the user;

[0020] And / or, the high-temperature feed liquid from at least one membrane distillation component is cooled by the fifth thermoelectric refrigerator module and the third thermoelectric refrigerator module in turn, and then flows back to the feed liquid tank to form a feed liquid circulation; at the same time, the heat energy generated by the fifth thermoelectric refrigerator module is provided to the user.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention is based on the principle of energy cascade utilization and integrates a fuel cell module, a thermoelectric generator module, a membrane distillation module and a thermoelectric refrigerator module. It is highly modular and can simply connect a single or multiple devices in a multi-generation system in series or parallel to form a multi-level system to meet the needs of different working conditions.

[0023] (2) The present invention introduces a thermoelectric generator and a thermoelectric refrigerator to perform thermal management on the fuel cell and membrane distillation, which can effectively recover the low-temperature waste heat generated by the fuel cell and improve the energy utilization efficiency and heat exchange efficiency of the system.

[0024] (3) The present invention sets up multiple thermoelectric refrigerators, establishes a coupling relationship between the membrane distillation module and different thermoelectric refrigerator modules, and forms different circulation loops of the feed liquid; it can fully utilize the heat energy and cold energy generated by the thermoelectric refrigerator, is suitable for different users' needs for fresh water, cold energy and heat energy, and realizes the maximization of energy utilization.

[0025] (4) All the equipment of the present invention has the characteristics of modularity, simple structure, fast startup, high reliability, short construction period, etc., and can provide users with fresh water, cold, heat and electricity in real time. It can be widely used in residential and automotive fields to achieve the purpose of energy saving and consumption reduction and improve energy utilization efficiency.

[0026] Other features and advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a multi-generation system coupling fuel cell-thermoelectric refrigeration-membrane distillation in an embodiment of the present invention;

[0028] Figure 2 Schematic diagram of the structure of a multi-stage system coupling thermoelectric refrigeration and membrane distillation in an embodiment of the present invention;

[0029] Among them, 1. hydrogen storage bottle, 2. air compressor, 3. PEMFC stack, 4. first DC / DC (AC) converter, 5. first electricity user, 6. first water pump, 7. third thermoelectric refrigerator module, 8. second water pump, 9. feed liquid tank, 10. second thermoelectric refrigerator module, 11. permeate tank, 12. fresh water user, 13. third water pump, 14. cold user, 15. hot user, 16. fourth thermoelectric refrigerator module, 17. first valve, 18. second valve, 19. fifth thermoelectric refrigerator module, 20. third valve, 21. fourth valve, 22. membrane distillation component, 23. second electricity user, 24. first thermoelectric refrigerator module, 25. second DC / DC (AC) converter, 26. thermoelectric generator module;

[0030] In addition, H represents the hot side of the thermoelectric module, and C represents the cold side of the thermoelectric module. DETAILED DESCRIPTION

[0031] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] Embodiment 1

[0034] In one or more embodiments, a multi-generation system coupling a fuel cell-thermoelectric refrigeration-membrane distillation is disclosed, combined with Figure 1 , specifically including: a fuel cell module, a thermoelectric generator module, a membrane distillation module and a plurality of thermoelectric refrigerator modules;

[0035] Specifically, the fuel cell module includes a proton exchange membrane fuel cell (hereinafter referred to as PEMFC) stack. The anode inlet of the PEMFC stack 3 is connected to the hydrogen storage bottle 1, and the cathode inlet is connected to the air compressor 2. The generated direct current is converted by a DC / DC (AC) converter to provide electrical energy to the first electricity user 5.

[0036] One end of the hot side of the thermoelectric generator module 26 is connected to the outlet of the stack coolant, and the other end is connected to the cold side of the first thermoelectric cooler module 24, the first water pump 6 and the inlet of the stack coolant in sequence; the PEMFC stack 3 can be thermally managed by arranging the thermoelectric generator module 26 and the first thermoelectric cooler module 24;

[0037] The first water pump 6 pumps the coolant into the PEMFC stack 3, and the coolant takes away the low-temperature waste heat generated by the PEMFC stack 3, and then enters the thermoelectric generator module 26 and the first thermoelectric refrigerator module 24 in turn to exchange heat (cool down), and the cooled coolant enters the PEMFC stack 3 again to cool it, and this process is continuously circulated to achieve cyclic cooling of the stack.

[0038] The cold side of the thermoelectric generator module 26 enhances heat exchange with the surrounding environment through the heat sink, and the generated direct current is converted by the DC / DC (AC) converter to provide auxiliary power for each module of the combined power supply system and provide electrical energy for the second electricity user 23.

[0039] In this embodiment, the membrane distillation system includes at least one membrane distillation component 22, a feed liquid tank 9 and a permeate tank 11. The feed liquid outlet of the feed liquid tank 9 is connected to the hot side of the second thermoelectric refrigerator module 10, the third thermoelectric refrigerator module 7 and the first thermoelectric refrigerator module 24 in sequence, and the high-temperature feed liquid inlet of each membrane distillation component 22; the permeate outlet of the membrane distillation component 22 is connected to the cold side of the second thermoelectric refrigerator module 10 and the permeate tank 11 in sequence, and the permeate tank 11 is connected to the fresh water user 12;

[0040] The heat energy generated by the second thermoelectric refrigerator module 10, the third thermoelectric refrigerator module 7 and the first thermoelectric refrigerator module 24 is used to preheat the low-temperature feed liquid from the feed liquid tank 9 and then pumped into the membrane distillation component 22. The high-temperature permeate from the membrane distillation component 22 is cooled by the cold energy generated by the second thermoelectric refrigerator module 10 and then flows into the permeate tank 11, completing a cycle to provide fresh water for the fresh water user 12; part of the fresh water in the permeate tank 11 is pumped into the membrane distillation component 22 again by the third water pump 13 for circulation.

[0041] In this embodiment, each stage of membrane distillation assembly 22 is also connected to the hot side of the fourth thermoelectric refrigerator module 16 and the cold side of the third thermoelectric refrigerator module in sequence. The cold side of the third thermoelectric refrigerator module is connected to the liquid tank 9 through the second water pump 8 to form a liquid circulation. A first valve 17 and a fourth valve 21 are respectively provided between each stage of membrane distillation assembly 22 and the fourth thermoelectric refrigerator module 16, and between the fourth thermoelectric refrigerator module 16 and the user.

[0042] When the first valve 17 and the fourth valve 21 are opened, the high-temperature liquid from the membrane distillation component 22 is first heated by the heat energy generated by the fourth thermoelectric refrigerator module 16, then cooled by the cold energy generated by the third thermoelectric refrigerator module, and then flows back to the liquid tank 9 to complete a cycle; at the same time, the cold side of the fourth thermoelectric refrigerator module 16 provides cold energy for the cold user 14.

[0043] As an optional embodiment, each stage of membrane distillation assembly 22 is also connected to the cold side of the fifth thermoelectric refrigerator module 19 and the cold side of the third thermoelectric refrigerator module in sequence, and the cold side of the third thermoelectric refrigerator module is connected to the feed liquid tank 9 to form a feed liquid circulation; a second valve 18 and a third valve 20 are respectively provided between each stage of membrane distillation assembly 22 and the fifth thermoelectric refrigerator module 19, and between the fifth thermoelectric refrigerator module 19 and the user.

[0044] When the second valve 18 and the third valve 20 are opened, the high-temperature liquid from the membrane distillation component 22 is first cooled by the cold energy generated by the fifth thermoelectric refrigerator module 19, and then further cooled by the cold energy generated by the third thermoelectric refrigerator module 7, and then flows back to the liquid tank 9 to complete a cycle; at the same time, the hot side of the fifth thermoelectric refrigerator module 19 provides thermal energy to the heat user 15.

[0045] The combined power generation system of the fuel cell-thermoelectric refrigeration-membrane distillation coupling in this embodiment has the following working conditions:

[0046] (1) When users need fresh water, electricity and cooling energy

[0047] The PEMFC stack 3 of the fuel cell system generates electric energy, heat energy and water by using the hydrogen stored in the hydrogen storage bottle 1. The generated direct current is converted by the first DC / DC (AC) converter 4 to provide electric energy for the first electric user 5. The first water pump 6, the first thermoelectric cooler module 24 and the thermoelectric generator module 26 are connected in sequence to form a PEMFC thermal management cycle. The thermoelectric generator module 26 generates direct current by using the temperature difference between the coolant carrying the residual heat of the stack and the surrounding environment. The direct current is converted by the second DC / DC (AC) converter 25 to provide auxiliary power to each module of the combined power supply system and provide electric energy to the second electric user 23. By providing the thermoelectric generator module 26 and the first thermoelectric cooler module 24, the energy utilization efficiency of the system is improved.

[0048] The heat energy generated by the second thermoelectric refrigerator module 10, the third thermoelectric refrigerator module 7 and the first thermoelectric refrigerator module 24 is used to preheat the low-temperature liquid from the liquid tank 9, and then pumped into the membrane distillation component 22. At this time, the first valve 17 and the fourth valve 21 are opened, and the second valve 18 and the third valve 20 are closed. The high-temperature liquid from the membrane distillation component 22 is first heated by the heat energy generated by the fourth thermoelectric refrigerator module 16, and then cooled by the cold energy generated by the third thermoelectric refrigerator module 7, and then flows back to the liquid tank 9 to complete a cycle; at the same time, part of the low-temperature permeate in the permeate tank 11 is pumped into the membrane distillation component 22 by the third water pump 13 to complete the membrane distillation process; the high-temperature permeate from the membrane distillation component 22 is cooled by the cold energy generated by the second thermoelectric refrigerator module 10, and then flows into the permeate tank 11 to complete a cycle, providing users with drinkable fresh water; in addition, the cold energy generated by the fourth thermoelectric refrigerator module 16 is provided to users; by setting a plurality of thermoelectric refrigerators, the heat exchange efficiency of the membrane distillation system is improved.

[0049] (2) When users need fresh water, electricity and heat

[0050] At this time, the first valve 17 and the fourth valve 21 are closed, the second valve 18 and the third valve 20 are opened, and the high-temperature feed liquid from the membrane distillation assembly 22 is first cooled by the cold energy generated by the fifth thermoelectric refrigerator module 19, and then further cooled by the cold energy generated by the third thermoelectric refrigerator module 7, and then flows back to the feed liquid tank 9, completing a cycle;

[0051] The heat energy generated by the fifth thermoelectric cooler module 19 is provided to the user; the remaining systems are the same as the cycles of the above working conditions.

[0052] (3) When users need fresh water, electricity, cold and heat energy

[0053] At this time, the first valve 17, the second valve 18, the third valve 20 and the fourth valve 21 are all opened, and part of the high-temperature liquid from the membrane distillation component 22 flows through the fourth thermoelectric refrigerator module 16 for heating, and part flows through the fifth thermoelectric refrigerator module 19 for cooling, and then converges into the third thermoelectric refrigerator module 7 for cooling, and then flows back to the liquid tank 9 to complete a cycle; the cold energy generated by the fourth thermoelectric refrigerator module 16 and the heat energy generated by the fifth thermoelectric refrigerator module 19 are provided to the user; the rest of the system is the same as the cycle of the above two working conditions.

[0054] As an optional implementation, combining Figure 2 The membrane distillation component 22 and the thermoelectric cooler module can be integrated into a multi-stage module component to meet the needs of different users for fresh water, cold and heat energy, and different operating conditions can be achieved by changing the opening of each valve.

[0055] The fuel cell module of this embodiment provides electrical energy and thermal energy to users; the thermoelectric generator module recovers the waste heat of the fuel cell to generate additional electrical energy to supply power to each module of the multi-generation system and users; the thermoelectric generator module and the thermoelectric refrigerator module perform thermal management on the fuel cell system, thereby improving the energy conversion efficiency of the system; the membrane distillation module is coupled with multiple thermoelectric refrigerator modules, thereby improving the water production efficiency of membrane distillation. According to the user's demand for fresh water, cold and thermal energy, the membrane distillation module can be coupled with the thermoelectric refrigerator module to form a single-stage or multi-stage system.

[0056] Embodiment 2

[0057] In one or more embodiments, a multi-generation method of coupling fuel cell-thermoelectric refrigeration-membrane distillation is disclosed, comprising:

[0058] The coolant of the fuel cell module stack with waste heat passes through the thermoelectric generator module 26 and the first thermoelectric cooler module 24 to cool down the stack, and then enters the fuel cell module again to circulate and cool the stack; the thermoelectric generator module 26 absorbs the waste heat of the coolant and converts it into electrical energy to provide auxiliary power for users and other modules;

[0059] The feed liquid in the membrane distillation module feed liquid tank 9 is heated by the second thermoelectric refrigerator module 10, the third thermoelectric refrigerator module 7 and the first thermoelectric refrigerator module 24 in sequence and then enters the membrane distillation component 22 of the membrane distillation module. The permeate of the membrane distillation component 22 is cooled by the second thermoelectric refrigerator module 10 and then enters the permeate tank 11 to provide fresh water for users.

[0060] As a further embodiment, the high-temperature feed liquid from at least one membrane distillation assembly 22 is heated by the fourth thermoelectric refrigerator module 16, and then cooled by the third thermoelectric refrigerator module 7, and then refluxed to the feed liquid tank 9, forming a feed liquid cycle; at the same time, the cold energy generated by the fourth thermoelectric refrigerator module 16 is provided to the user;

[0061] and / or,

[0062] The high-temperature liquid from at least one membrane distillation component 22 is cooled by the fifth thermoelectric refrigerator module 19 and the third thermoelectric refrigerator module 7 in turn, and then flows back to the liquid tank 9 to form a liquid circulation; at the same time, the heat energy generated by the fifth thermoelectric refrigerator module 19 is provided to the user.

[0063] The specific implementation of the above process has been described in detail in Example 1 and will not be described in detail here.

[0064] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A multi-generation system coupling fuel cell-thermoelectric refrigeration-membrane distillation, characterized in that: include: A fuel cell module, a thermoelectric generator module, a membrane distillation module, and a plurality of thermoelectric refrigerator modules; The fuel cell module, the thermoelectric generator module and the first thermoelectric cooler module are connected in sequence. The coolant of the fuel cell module stack with waste heat passes through the thermoelectric generator module and the first thermoelectric cooler module in sequence to cool down the stack, and then enters the fuel cell module again to circulate and cool the stack. The thermoelectric generator module absorbs the waste heat of the coolant and converts it into electrical energy to provide auxiliary power for users and other modules. The membrane distillation module comprises at least one membrane distillation component, a feed liquid tank and a permeate tank, wherein the feed liquid outlet of the feed liquid tank is sequentially connected to the hot side of the second thermoelectric refrigerator module, the third thermoelectric refrigerator module and the first thermoelectric refrigerator module and the high-temperature feed liquid inlet of each membrane distillation component; the permeate outlet of the membrane distillation component is sequentially connected to the cold side of the second thermoelectric refrigerator module and the permeate tank, and the permeate tank is connected to the fresh water user; Each level of membrane distillation assembly is also connected to the hot side of the fourth thermoelectric refrigerator module and the cold side of the third thermoelectric refrigerator module in sequence. The cold side of the third thermoelectric refrigerator module is connected to the liquid tank to form a liquid circulation. The cold side of the fourth thermoelectric refrigerator module provides cold energy for users. Each level of membrane distillation assembly is also connected to the cold side of the fifth thermoelectric refrigerator module and the cold side of the third thermoelectric refrigerator module in sequence, and the cold side of the third thermoelectric refrigerator module is connected to the feed liquid tank to form a feed liquid circulation; the hot side of the fifth thermoelectric refrigerator module provides heat energy for users; Each stage of membrane distillation components can be coupled with different thermoelectric cooler modules to meet the needs of different users for fresh water, cold energy and heat energy.

2. A multi-generation system coupling fuel cell-thermoelectric refrigeration-membrane distillation as claimed in claim 1, characterized in that: Valves are provided between each stage of membrane distillation assembly and the fourth thermoelectric refrigerator module, and between the fourth thermoelectric refrigerator module and the user.

3. A multi-generation system coupling fuel cell-thermoelectric refrigeration-membrane distillation as claimed in claim 2, characterized in that: Valves are provided between each stage of membrane distillation assembly and the fifth thermoelectric refrigerator module, and between the fifth thermoelectric refrigerator module and the user.

4. A multi-generation system coupled with fuel cell-thermoelectric refrigeration-membrane distillation as claimed in claim 1, characterized in that: The fuel cell module comprises a PEMFC stack, an anode inlet of the PEMFC stack is connected to a hydrogen storage bottle, and a cathode inlet is connected to an air compressor. The generated direct current is converted to provide electric energy for users.

5. A multi-generation system coupling fuel cell-thermoelectric refrigeration-membrane distillation as claimed in claim 1, characterized in that: One end of the hot side of the thermoelectric generator module is connected to the stack coolant outlet of the fuel cell module, and the other end is connected to the cold side of the first thermoelectric cooler module; the cold side of the thermoelectric generator module is enhanced in heat exchange with the surrounding environment by the heat sink.

6. A method for operating a multi-generation system coupled with a fuel cell-thermoelectric refrigeration-membrane distillation as claimed in claim 1, characterized in that: include: The coolant of the fuel cell module stack with waste heat passes through the thermoelectric generator module and the first thermoelectric cooler module to cool down the stack in turn, and then enters the fuel cell module again to circulate and cool the stack; the thermoelectric generator module absorbs the waste heat of the coolant and converts it into electrical energy to provide auxiliary power for users and other modules; The feed liquid in the membrane distillation module feed liquid tank is heated by the second thermoelectric refrigerator module, the third thermoelectric refrigerator module and the first thermoelectric refrigerator module in sequence and then enters the membrane distillation component of the membrane distillation module. The permeate of the membrane distillation component is cooled by the second thermoelectric refrigerator module and then enters the permeate tank to provide fresh water for users.

7. The method for operating a multi-generation system coupled with a fuel cell-thermoelectric refrigeration-membrane distillation system as claimed in claim 6, characterized in that: The high-temperature feed liquid from at least one membrane distillation component is heated by the fourth thermoelectric refrigerator module, and then cooled by the third thermoelectric refrigerator module before flowing back to the feed liquid tank to form a feed liquid cycle; at the same time, the cold energy generated by the fourth thermoelectric refrigerator module is provided to the user; And / or, the high temperature liquid from at least one membrane distillation module passes through the fifth thermoelectric cooler module in sequence After being cooled by the third thermoelectric cooler module, it flows back to the liquid tank to form a liquid circulation; at the same time, The heat energy generated by the fifth thermoelectric cooler module is provided to the user.

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