LT-PEMFC and HT-PEMFC combined system

Abstract

The utility model relates to the field of fuel cell power generation systems, and provides an LT-PEMFC (low temperature proton exchange membrane fuel cell) and HT-PEMFC combined system, which comprises a low temperature proton exchange membrane fuel cell, a high-temperature proton exchange membrane fuel cell; an air supply module; an air humidifying and preheating device; a hydrogen supply device; a hydrogen mixing device; the input end of the hydrogen recovery module is communicated with the hydrogen output end of the low-temperature proton exchange membrane fuel cell or the hydrogen output end of the high-temperature proton exchange membrane fuel cell, and the output end of the hydrogen recovery module is communicated to the hydrogen mixing device; a cooling liquid supply device; a cooling liquid mixing device; the liquid heat exchange module is used for heating cold water through waste heat to obtain hot water, one cooling liquid output end of the high-temperature proton exchange membrane fuel cell is communicated to the cooling liquid input end of the liquid heat exchange module, and the cooling liquid output end of the liquid heat exchange module is communicated to the cooling liquid supply device. The method has the advantages of improving the waste heat utilization rate of the fuel cell system and improving the starting speed.

Description

Technical Field

[0001] The utility model relates to the field of fuel cell power generation systems, and more specifically, to a combined system of LT-PEMFC and HT-PEMFC. Background Art

[0002] A proton exchange membrane fuel cell is a device that directly converts chemical energy into electrical energy, with an energy conversion efficiency of over 60%, higher than that of traditional internal combustion engines. In addition, the product of the fuel cell is pollution-free water, so it has good clean energy properties. These advantages have made fuel cells highly concerned and applied in fields such as automobiles, aerospace, and portable devices. Proton exchange membrane fuel cells can be divided into low-temperature proton exchange membrane fuel cells (<100 °C) (LT-PEMFC) and high-temperature proton exchange membrane fuel cells (100 - 200 °C) (HT-PEMFC) according to different operating temperatures.

[0003] Currently, LT-PEMFC is the most widely used. Its lower operating temperature enables it to reach the optimal operating state faster, can be applied to scenarios that require rapid response, and has a longer component life. However, LT-PEMFC has high requirements for gas quality, which will increase the operating cost of the system. The temperature of the gas and coolant discharged by LT-PEMFC is generally less than 100 °C, and the utilization of waste heat is poor.

[0004] Compared with LT-PEMFC, HT-PEMFC with a higher operating temperature not only has faster reaction kinetics, higher catalytic efficiency, and more convenient water and heat management, but also has higher tolerance to impurity gases. The temperature of the gas and coolant discharged by HT-PEMFC can reach 200 °C, which is higher than that of LT-PEMFC, and the availability of waste heat is also higher. However, the startup speed of HT-PEMFC is relatively slow and requires a long preheating time.

[0005] Therefore, it has great practical significance to study a fuel cell system that can combine the advantages of LT-PEMFC and HT-PEMFC, which can make full use of the waste heat of the fuel cell system and also accelerate the startup speed. Summary of the Utility Model

[0006] The utility model aims to overcome at least one defect (shortcoming) of the above-mentioned prior art, and provides a combined system of LT-PEMFC and HT-PEMFC for improving the waste heat utilization rate of the fuel system.

[0007] The utility model provides a combined system of LT-PEMFC and HT-PEMFC, including:

[0008] Low-temperature proton exchange membrane fuel cell; High-temperature proton exchange membrane fuel cell;

[0009] An air supply module for supplying air to a low-temperature proton exchange membrane fuel cell and a high-temperature proton exchange membrane fuel cell;

[0010] An air humidifying and preheating device for recovering the air output from a low-temperature proton exchange membrane fuel cell and a high-temperature proton exchange membrane fuel cell and communicating with the air supply module to form a recycling of air and waste heat;

[0011] A hydrogen supply device for supplying hydrogen to a low-temperature proton exchange membrane fuel cell and a high-temperature proton exchange membrane fuel cell;

[0012] A hydrogen mixing device, whose output end is communicated with the anode inlet of a low-temperature proton exchange membrane fuel cell or a high-temperature proton exchange membrane fuel cell through the hydrogen mixing device;

[0013] A hydrogen recovery module, the input end of the hydrogen recovery module is communicated with the hydrogen output end of a low-temperature proton exchange membrane fuel cell or the hydrogen output end of a high-temperature proton exchange membrane fuel cell, and the output end of the hydrogen recovery module is communicated to the hydrogen mixing device,

[0014] A coolant supply device for supplying coolant to a low-temperature proton exchange membrane fuel cell;

[0015] A coolant mixing device, whose input end is communicated with the coolant output end of a low-temperature proton exchange membrane fuel cell and one coolant output end of a high-temperature proton exchange membrane fuel cell, and whose output end is communicated with the coolant input end of the high-temperature proton exchange membrane fuel cell;

[0016] A liquid heat exchange module for heating cold water with waste heat to obtain hot water, one coolant output end of the high-temperature proton exchange membrane fuel cell is communicated with the coolant input end of the liquid heat exchange module, and the coolant output end of the liquid heat exchange module is communicated with the coolant supply device.

[0017] In this technical solution, the low-temperature proton exchange membrane fuel cell is a battery system with an air input end, a coolant input end, an air output end, a coolant output end and a hydrogen output end; the high-temperature proton exchange membrane fuel cell is also a battery system with an air input end, a coolant input end, an air output end, a coolant output end and a hydrogen output end.

[0018] In some embodiments of the present utility model, the output end of the air supply module is communicated with the air input ends of the low-temperature proton exchange membrane fuel cell and the high-temperature proton exchange membrane fuel cell. For the air humidifying and preheating device, after the air output from the high-temperature proton exchange membrane fuel cell enters the device, a small part of the heat is dissipated through heat exchange and then enters the air supply module. The remaining heat of the air itself is used to perform heat exchange on the air in the air supply module, so that the heat of the output air can be utilized to heat the input air. After the air output from the low-temperature proton exchange membrane fuel cell enters the air humidifying and preheating device, it is mixed with the air output from the air supply module and then enters the high-temperature proton exchange membrane fuel cell for utilization together.

[0019] In some embodiments of the present utility model, the output end of the hydrogen supply module is communicated with the hydrogen input ends of the low-temperature proton exchange membrane fuel cell and the high-temperature proton exchange membrane fuel cell. The hydrogen recovery module is used to recover the hydrogen from the fuel cell and then output it to the hydrogen mixing device. The hydrogen mixing device collects and mixes the hydrogen from the hydrogen supply device and the hydrogen recovery module and then outputs it to the fuel cell. That is, the hydrogen with heat and water vapor from the fuel cell is mixed with the hydrogen from the hydrogen supply module, preheated and humidified, and then enters the fuel cell together. In this way, the waste heat of the hydrogen output from the fuel cell is fully utilized and the hydrogen itself can also be recycled. And the HT-PEMFC has good gas impurity tolerance. Therefore, directly introducing the hydrogen tail gas of the LT-PEMFC with reduced hydrogen concentration into the HT-PEMFC not only does not affect the power generation efficiency of the HT-PEMFC, but also can effectively improve the utilization rate of the tail gas.

[0020] In some embodiments of the present utility model, the output end of the coolant supply device is communicated with the coolant input end of the low-temperature proton exchange membrane fuel cell. The coolant mixing device collects and mixes the coolants output from the low-temperature proton exchange membrane fuel cell and the high-temperature proton exchange membrane fuel cell and then outputs it for use by the high-temperature proton exchange membrane fuel cell. That is, the coolant with heat output from the high-temperature proton exchange membrane fuel cell heats the coolant output from the low-temperature proton exchange membrane fuel cell in this device, so that the temperature of the coolant meets the coolant use temperature of the high-temperature proton exchange membrane fuel cell. In this way, the heat of the coolant output from the high-temperature proton exchange membrane fuel cell is fully utilized, and the coolants output from both fuel cells can be recycled.

[0021] In the liquid heat exchange module, the high-temperature coolant output from the high-temperature proton exchange membrane fuel cell uses its own heat to heat the cold water. After losing heat and cooling itself, it is output to the coolant supply device. In this way, the heat of the coolant output from the battery is fully utilized, and the coolant itself can also be recycled. After the cold water is heated into hot water, it can be used as daily water.

[0022] Therefore, the technical solution fully utilizes the heat carried by the air, hydrogen, and coolant output by the two fuel cells, improving the heat utilization rate. At the same time, it combines the advantage of the fast start-up of the low-temperature proton exchange membrane fuel cell, improving the start-up speed of the entire combined system. Secondly, due to the full utilization of waste heat, the combined system of the present utility model does not require heating devices and heat dissipation devices, simplifies the system structure, saves equipment costs, and is more convenient for maintenance. Moreover, the substances output by the two fuel cells are also recycled, greatly saving materials and further reducing costs.

[0023] Further, the air supply module includes an air compressor and an air humidifier. The air humidifier includes an air input end, an air output end, and a heat source input end; the air humidifying and preheating device includes an air input end, an air output end, a heat source input end, and a heat source output end.

[0024] One output end of the air compressor is connected to the air input end of the air humidifier, and the air output end of the air humidifier is connected to the low-temperature proton exchange membrane fuel cell; the other output end of the air compressor is connected to one air input end of the air humidifying and preheating device, the air output end of the low-temperature proton exchange membrane fuel cell is connected to the other air input end of the air humidifying and preheating device, and the air output end of the air humidifying and preheating device is connected to the air input end of the high-temperature proton exchange membrane fuel cell; the air output end of the high-temperature proton exchange membrane fuel cell is connected to the heat source input end of the air humidifying and preheating device, and the heat source output end of the air humidifying and preheating device is connected to the heat source input end of the air humidifier.

[0025] In this technical solution, the air from the air compressor enters the air humidifying and preheating device and mixes with the air output by the low-temperature proton exchange membrane fuel cell, and the two are output to the high-temperature proton exchange membrane fuel cell together. During this process, the compressed air is humidified and preheated. The air output by the high-temperature proton exchange membrane fuel cell enters the air humidifying and preheating device, and after at least partial heat exchange, it is output to the air humidifier, where it undergoes heat exchange and cools down, and the heat is used to heat the air input by the compressed air. The humidified and heated air is output to the low-temperature proton exchange membrane fuel cell for use. The air input at the heat source input end of the air humidifying and preheating device and the air input at the air input end do not communicate with each other.

[0026] Further, the air humidifier further includes a bottle cap that matches the mouth of the water bottle.

[0027] Further, the air humidifier further includes a heat source output end. The air humidifier includes an air chamber and a heating chamber. The air chamber is disposed above the heating chamber. A water bottle is provided in the heating chamber. The opening of the water bottle communicates with the air chamber. The heat source input end and the heat source output end of the air humidifier are both disposed above the heating chamber. The air input end and the air output end of the air humidifier are both disposed on the air chamber.

[0028] In this technical solution, the hot air output by the air humidifying and preheating device enters the heating chamber to heat the water in the water bottle. After the water is heated, heat-carrying water vapor is generated. The compressed air in the air chamber is mixed with the water vapor and then humidified and preheated before being output to the low-temperature proton exchange membrane fuel cell for utilization. The air in the air chamber and the heating chamber do not communicate with each other.

[0029] Further, the hydrogen recovery module includes a water separator and a circulation device. The input end of the water separator is connected to the hydrogen output end of the low-temperature proton exchange membrane fuel cell or the high-temperature proton exchange membrane fuel cell. The output end of the water separator is connected to the circulation device. The output end of the circulation device is connected to the hydrogen mixer.

[0030] In this technical solution, the hydrogen coming out of the fuel cell is separated into hydrogen and water in the water separator. The circulation device is used to transport the hydrogen to the hydrogen mixing device. The hydrogen still carries moisture and heat when it comes out of the water separator. It is mixed with the hydrogen from the hydrogen supply device in the hydrogen mixing device and then enters the fuel cell for use together.

[0031] Further, an exhaust device is further included. The input end of the exhaust device is connected to the output end of the circulation device.

[0032] In this technical solution, the exhaust device is used to periodically exhaust the circulation device. Since a small amount of nitrogen is mixed in the hydrogen, regular exhaust can reduce the accumulation of nitrogen.

[0033] Further, a tail gas treatment system is further included. The tail gas treatment system is connected to the gas supply module, the coolant supply module, the hydrogen recovery module, and the liquid heat exchange module, and is used to treat and utilize the tail gas.

[0034] Further, the liquid heat exchange module includes a cold water storage tank, a heat exchange storage tank, and a hot water storage tank. A transmission water pipe is provided in the heat exchange storage tank. The outlet of the cold water storage tank is connected to the inlet of the transmission water pipe. The inlet of the hot water storage tank is connected to the outlet of the transmission water pipe.

[0035] In this technical solution, the water in the cold water storage tank is heated into hot water when passing through the transmission water pipe and enters the hot water storage tank. The hot water in the hot water storage tank can be used as domestic water. Specifically, the cold water storage tank, the heat exchange storage tank, and the hot water storage tank can all be vertical, horizontal, or any other installation direction that meets the actual requirements.

[0036] Furthermore, the heat exchange storage tank is a vertical storage tank, the transmission water pipe is a vertical water pipe, the inlet of the transmission water pipe is at the lower part, and the outlet of the transmission water pipe is at the upper part; the transmission water pipe includes a first transmission water pipe and a second transmission water pipe; there is also a coolant pipe in the heat exchange storage tank, the inlet of the coolant pipe is arranged at the upper part of the heat exchange storage tank, the outlet of the coolant pipe is arranged at the lower part of the heat exchange storage tank, the coolant pipe is wound around the outside of the first transmission water pipe in contact from top to bottom, and the outlet of the coolant pipe is communicated with the coolant supply device.

[0037] In this technical solution, preferably, a water pump is connected between the cold water storage tank and the heat exchange storage tank. The heat-carrying coolant coming out of the high-temperature proton exchange membrane fuel cell is transmitted from top to bottom in the coolant pipe, heating the water in the first transmission water pipe. The cold water is heated into hot water when flowing from bottom to top in the water pipe and then output, while the coolant itself has its temperature reduced due to heat exchange and is output to the coolant supply device for recycling.

[0038] Furthermore, the heat exchange storage tank further includes a heating pipe, the inlet of the heating pipe is arranged at the upper part of the heat exchange storage tank, the outlet of the heating pipe is arranged at the lower part of the heat exchange storage tank, the heating pipe is wound around the outside of the second transmission water pipe in contact from top to bottom, the inlet of the heating pipe is communicated with the tail gas treatment system, and there is a spaced space between the heating pipe and the coolant pipe.

[0039] In this technical solution, when the heat generated by the tail gas treatment system passes through the heating pipe, it heats the water in the transmission water pipe, improving the heating efficiency of the water in the transmission water pipe, and at the same time making use of the heat generated by the tail gas treatment system.

[0040] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0041] (1) The present utility model makes full use of the heat carried by the air, hydrogen and coolant output by the two fuel cells, improves the heat utilization rate, and at the same time combines the advantage of the fast start-up of the low-temperature proton exchange membrane fuel cell, improving the start-up speed of the entire combined system;

[0042] (2) Due to the full utilization of waste heat, the combined system of the present utility model does not need to use heating devices and cooling devices, simplifies the system structure, saves equipment costs, and is more convenient for maintenance;

[0043] (3) The substances output by the two fuel cells are also recycled, greatly saving the materials used and further saving costs. Description of the Drawings

[0044] Figure 1 It is a schematic diagram of the combined system of the present utility model.

[0045] Figure 2 This is a schematic structural diagram of the air humidifier of the present utility model.

[0046] Figure 3 This is a schematic structural diagram of the air humidifying and preheating device of the present utility model.

[0047] Figure 4 This is a schematic structural diagram of the liquid heat exchange module of the present utility model.

[0048] Reference numerals: low-temperature proton exchange membrane fuel cell 100, high-temperature proton exchange membrane fuel cell 200, air supply module 300, air compressor 310, air humidifier 320, air chamber 321, heating chamber 322, bottle cap 323, air humidifying and preheating device 400, gas chamber 410, heat chamber 420, hydrogen supply device 500, first hydrogen mixing device 510, second hydrogen mixing device 520, first hydrogen recovery module 530, first water separator 531, first circulation device 532, second water separator 541, second circulation device 542, first exhaust device 550, second exhaust device 560, coolant supply device 600, coolant mixing device 700, liquid heat exchange module 800, cold water storage tank 810, heat exchange storage tank 820, first transmission water pipe 821, coolant pipeline 822, heating pipeline 823, second transmission water pipe 824, hot water storage tank 830, tail gas treatment system 900, tail gas combustion device 910, tail drainage storage tank. Detailed implementation manners

[0049] The drawings of the present utility model are only for illustrative purposes and should not be construed as a limitation of the present utility model. For better illustrating the following embodiments, some components in the drawings may be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0050] Embodiment 1

[0051] Reference Figure 1 , this embodiment provides a combined system of LT-PEMFC and HT-PEMFC, including:

[0052] Low-temperature proton exchange membrane fuel cell 100; high-temperature proton exchange membrane fuel cell 200;

[0053] Air supply module 300, used to supply air to the low-temperature proton exchange membrane fuel cell 100 and the high-temperature proton exchange membrane fuel cell 200;

[0054] An air humidifying and preheating device 400 is used to recover the air output by the low-temperature proton exchange membrane fuel cell 100 and the high-temperature proton exchange membrane fuel cell 200, and is connected to the air supply module 300 to form a recycling of air and waste heat.

[0055] A hydrogen supply device 500 is used to supply hydrogen to the low-temperature proton exchange membrane fuel cell 100 and the high-temperature proton exchange membrane fuel cell 200; preferably, the coolant supply device 600 is a coolant storage tank.

[0056] A hydrogen mixing device, whose output end is connected to the anode inlet of the low-temperature proton exchange membrane fuel cell 100 or the high-temperature proton exchange membrane fuel cell 200 through the hydrogen mixing device;

[0057] A hydrogen recovery module, the input end of the hydrogen recovery module is connected to the hydrogen output end of the low-temperature proton exchange membrane fuel cell 100 or the hydrogen output end of the high-temperature proton exchange membrane fuel cell 200, and the output end of the hydrogen recovery module is connected to the hydrogen mixing device,

[0058] A coolant supply device 600 is used to supply coolant to the low-temperature proton exchange membrane fuel cell 100;

[0059] A coolant mixing device 700, whose input end is connected to the coolant output end of the low-temperature proton exchange membrane fuel cell 100 and one coolant output end of the high-temperature proton exchange membrane fuel cell 200, and whose output end is connected to the coolant input end of the high-temperature proton exchange membrane fuel cell 200;

[0060] A liquid heat exchange module 800 is used to heat cold water to obtain hot water by using waste heat. One coolant output end of the high-temperature proton exchange membrane fuel cell 200 is connected to the coolant input end of the liquid heat exchange module 800, and the coolant output end of the liquid heat exchange module 800 is connected to the coolant supply device 600.

[0061] The air supply module 300 includes an air compressor 310 and an air humidifier 320. The air humidifier 320 includes an air input end, an air output end and a heat source input end; the air humidifying and preheating device 400 includes an air input end, an air output end, a heat source input end and a heat source output end;

[0062] One output end of the air compressor 310 is communicated with the air input end of the air humidifier 320, and the air output end of the air humidifier 320 is communicated with the low-temperature proton exchange membrane fuel cell 100; another output end of the air compressor 310 is communicated with one air input end of the air humidifying and preheating device 400, the air output end of the low-temperature proton exchange membrane fuel cell 100 is communicated with another air input end of the air humidifying and preheating device 400, and the air output end of the air humidifying and preheating device 400 is communicated with the air input end of the high-temperature proton exchange membrane fuel cell 200; the air output end of the high-temperature proton exchange membrane fuel cell 200 is communicated with the heat source input end of the air humidifying and preheating device 320, and the heat source output end of the air humidifying and preheating device 320 is communicated with the heat source input end of the air humidifier 320.

[0063] In this technical solution, the air of the air compressor enters the air humidifying and preheating device, mixes with the air output by the low-temperature proton exchange membrane fuel cell, and the two are output to the high-temperature proton exchange membrane fuel cell together. During this process, the compressed air is humidified and preheated. The air output by the high-temperature proton exchange membrane fuel cell 200 enters the air humidifying and preheating device 400, and after at least partial heat exchange, it is output to the air humidifier 320, where it undergoes heat exchange and cools down, and the heat is used for the air input by the compressed air. The humidified and heated air is output to the low-temperature proton exchange membrane fuel cell 100 for use. The air input at the heat source input end of the air humidifying and preheating device 400 and the air input at the air input end do not communicate with each other.

[0064] Reference Figure 3 , specifically, the air humidifying and preheating device 400 includes a gas chamber 410 and a heat chamber 420. The gas chamber 410 is arranged on the heat chamber 420. A water storage container is arranged in the heat chamber 420, and the opening of the water storage container communicates with the gas chamber 410; the air output end and the air input end of the air humidifying and preheating device 400 are both arranged on the gas chamber 410, and the heat source output end and the heat source input end of the air humidifier 320 are both arranged on the heat chamber 420.

[0065] The air humidifying and preheating device 400 further includes a bottle cap, and the bottle cap 323 matches the bottle mouth of the water bottle. The air output from the high-temperature proton exchange membrane fuel cell 200 heats the gas in the gas chamber 410 and simultaneously heats the water in the water bottle. When the bottle cap 323 seals the bottle mouth of the water bottle, the heat of the compressed air comes from the output air of the low-temperature proton exchange membrane fuel cell 100 and the heat of the output air of the high-temperature proton exchange membrane fuel cell 200; when the bottle cap 323 partially seals or does not seal the bottle mouth, that is, when the bottle mouth is open, the heat of the compressed air also comes from the heat of the water vapor, and at the same time its moisture also increases the part provided by the water vapor. Thus, the heating and humidifying degree of the compressed air is adjusted by adjusting the position of the bottle cap 323.

[0066] Reference Figure 2 The air humidifier 320 further includes a heat source output end. The air humidifier 320 includes an air chamber 321 and a heating chamber 322. The air chamber 321 is disposed on the heating chamber 322. A water bottle is disposed in the heating chamber 322. The opening of the water bottle is communicated with the air chamber 321. The heat source input end and the heat source output end of the air humidifier 320 are both disposed on the heating chamber 322. The air input end and the air output end of the air humidifier 320 are both disposed on the air chamber 321.

[0067] In this technical solution, the hot air output by the air humidifying and preheating device 400 enters the heating chamber 322 of the air humidifier 320 to heat the water in the water bottle. After the water is heated, heat-carrying water vapor is generated. The compressed air in the air chamber 321 is mixed with the water vapor and then humidified and preheated, and then output to the low-temperature proton exchange membrane fuel cell 100 for utilization. The air in the air chamber 321 and the heating chamber 322 do not communicate with each other.

[0068] The air humidifier 320 further includes a bottle cap 323, whose structure and function are the same as those of the bottle cap 323 in the air humidifying and preheating device 400, and will not be described herein again.

[0069] The hydrogen recovery module includes a water separator and a circulation device. The input end of the water separator is communicated with the hydrogen output end of the low-temperature proton exchange membrane fuel cell 100 or the high-temperature proton exchange membrane fuel cell 200. The output end of the water separator is communicated to the circulation device. The output end of the circulation device is communicated to the hydrogen mixer.

[0070] Specifically, the hydrogen mixing device includes a first hydrogen mixing device 520 and a second hydrogen mixing device. The hydrogen supply device 500 is a hydrogen tank. One output end of the hydrogen tank is communicated to the first hydrogen mixing device 520, and the other output end is communicated to the second hydrogen mixing device.

[0071] The hydrogen recovery module includes a first hydrogen recovery module 540 and a second hydrogen recovery module. The first hydrogen recovery module 540 includes a first water separator 531 and a first circulation device 542. The input end of the first water separator 531 is communicated with one hydrogen output end of the low-temperature proton exchange membrane fuel cell 100. The output end of the first circulation device 542 is communicated to the first hydrogen mixing device 520. The output end of the first hydrogen mixing device 520 is communicated to the low-temperature proton exchange membrane fuel cell 100.

[0072] The second hydrogen recovery module includes a second water separator 541 and a second circulation device 542. The input end of the second water separator 541 is connected to the hydrogen output end of the high-temperature proton exchange membrane fuel cell 200. The output end of the second circulation device 542 is connected to the second hydrogen mixing device, and the output end of the second hydrogen mixing device is connected to the high-temperature proton exchange membrane fuel cell 200.

[0073] Preferably, both the first circulation device 542 and the second circulation device 542 are circulation pumps.

[0074] The output end of the low-temperature proton exchange membrane fuel cell 100 is also connected to the second hydrogen mixing device. The hydrogen tank is also connected to the hydrogen input end of the high-temperature proton exchange membrane fuel cell 200 through the second hydrogen mixing device. That is, a part of the hydrogen output from the low-temperature proton exchange membrane fuel cell 100 enters the water separator, and the other part enters the second hydrogen mixing device to be mixed with the hydrogen output from the hydrogen tank, providing preheated and humidified hydrogen for the high-temperature proton exchange membrane fuel cell 200 for use.

[0075] It further includes an exhaust device and a tail gas treatment system 900. The input end of the exhaust device is connected to the output end of the circulation device. The tail gas treatment system 900 is connected to the gas supply module, the coolant supply module, the hydrogen recovery module, and the liquid heat exchange module 800 for treating and utilizing the tail gas.

[0076] Specifically, the tail gas treatment system 900 includes a tail gas combustion device 910 and a tail water storage tank 920.

[0077] The exhaust device includes a first exhaust device 550 and a second exhaust device 560. The input end of the first exhaust device 550 is connected to the output end of the first circulation device 542, and its output end is connected to the tail gas combustion device 910; the input end of the second exhaust device 560 is connected to the output end of the second circulation device 542, and its output end is connected to the tail gas combustion device 910; the air humidifier 320 further includes a heat source output end, and the heat source output end is connected to the tail gas combustion device 910.

[0078] The output end of the tail gas combustion device 910 is connected to the drainage storage tank, and one output end of the first water separator 531 and the second water separator 541 are both connected to the drainage storage tank.

[0079] In this way, the cooled air discharged from the air humidifier 320 and the hydrogen discharged from the exhaust device can both be burned in the tail gas combustion device 910. The water generated by the tail gas combustion device 910 and the water separator can both be stored in the tail water storage tank 920.

[0080] Reference Figure 4, the liquid heat exchange module 800 includes a cold water storage tank 810, a heat exchange storage tank 830, and a hot water storage tank 830. A transmission water pipe is provided in the heat exchange storage tank 830. The outlet of the cold water storage tank is connected to the inlet of the transmission water pipe, and the inlet of the hot water storage tank is connected to the outlet of the transmission water pipe. The hot water in the hot water storage tank 830 can meet the daily water use requirements of automobiles, stationary power plants, factories, shops, residential buildings, central kitchens, hospitals, schools, etc.

[0081] The heat exchange storage tank 830 is a vertical storage tank, the transmission water pipe is a vertical water pipe, the inlet of the transmission water pipe is at the lower part, and the outlet of the transmission water pipe is at the upper part; the transmission water pipe includes a first transmission water pipe 821 and a second transmission water pipe 824. There is also a coolant pipe 822 in the heat exchange storage tank 830. The inlet of the coolant pipe 822 is provided at the upper part of the heat exchange storage tank 830, and the outlet of the coolant pipe 822 is provided at the lower part of the heat exchange storage tank 830. The coolant pipe 822 is wound around the outside of the first transmission water pipe 821 from top to bottom in contact. The outlet of the coolant pipe 822 is connected to the coolant supply device 600.

[0082] In this technical solution, preferably, a water pump is connected between the cold water storage tank and the heat exchange storage tank 830. The heat-carrying coolant coming out of the high-temperature proton exchange membrane fuel cell 200 is transmitted from top to bottom in the coolant pipe 822, heating the water in the first transmission water pipe 821. The cold water is heated into hot water when flowing from bottom to top in the water pipe and then output into the hot water storage tank 830. The coolant itself has its temperature reduced due to heat exchange and is output to the coolant supply device 600 for recycling.

[0083] The heat exchange storage tank 830 further includes a heating pipe 823. The inlet of the heating pipe 823 is provided at the upper part of the heat exchange storage tank 830, and the outlet of the heating pipe 823 is provided at the lower part of the heat exchange storage tank 830. The heating pipe 823 is wound around the outside of the second transmission water pipe 824 from top to bottom in contact. The inlet of the heating pipe 823 is connected to the tail gas treatment system 900, and there is a spaced space between the heating pipe 823 and the coolant pipe 822.

[0084] The heat generated by the tail gas combustion device 910 burning the tail gas carries part of the gas into the heating pipe 823 and finally discharges from the outlet of the heating pipe 823. The heating pipe 823 heats the water in the second transmission water pipe 824, and the heated water enters the hot water storage tank 830 for use.

[0085] Obviously, the above embodiments of the present utility model are merely examples for clearly explaining the technical solutions of the present utility model, rather than limitations on the specific implementation manners of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the claims of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A combined system of LT-PEMFC and HT-PEMFC, characterized in that: include: Low temperature proton exchange membrane fuel cells; High temperature proton exchange membrane fuel cells; An air supply module, used for providing air to the low-temperature proton exchange membrane fuel cell and the high-temperature proton exchange membrane fuel cell; An air humidification and preheating device is used to recover the air output by the low-temperature proton exchange membrane fuel cell and the high-temperature proton exchange membrane fuel cell, and is connected to the air supply module to form a recycling of air and waste heat; A hydrogen supply device, used to provide hydrogen for low-temperature proton exchange membrane fuel cells and high-temperature proton exchange membrane fuel cells; A hydrogen mixing device, the output end of which is connected to the anode inlet of the low-temperature proton exchange membrane fuel cell or the high-temperature proton exchange membrane fuel cell through the hydrogen mixing device; A hydrogen recovery module, wherein the input end of the hydrogen recovery module is connected to the hydrogen output end of the low-temperature proton exchange membrane fuel cell or the hydrogen output end of the high-temperature proton exchange membrane fuel cell, and the output end of the hydrogen recovery module is connected to a hydrogen mixing device and a coolant supply device, which is used to provide coolant to the low-temperature proton exchange membrane fuel cell; A coolant mixing device, whose input end is connected to the coolant output end of the low-temperature proton exchange membrane fuel cell and one coolant output end of the high-temperature proton exchange membrane fuel cell, and whose output end is connected to the coolant input end of the high-temperature proton exchange membrane fuel cell; The liquid heat exchange module is used to utilize waste heat to heat cold water to obtain hot water. A coolant output end of the high-temperature proton exchange membrane fuel cell is connected to the coolant input end of the liquid heat exchange module, and the coolant output end of the liquid heat exchange module is connected to the coolant supply device.

2. The combined system of LT-PEMFC and HT-PEMFC according to claim 1, characterized in that: The air supply module includes an air compressor and an air humidifier, the air humidifier includes an air input end, an air output end and a heat source input end; the air humidification preheating device includes an air input end, an air output end, a heat source input end and a heat source output end; One output end of the air compressor is connected to the air input end of the air humidifier, and the air output end of the air humidifier is connected to the low-temperature proton exchange membrane fuel cell; the other output end of the air compressor is connected to an air input end of the air humidification and preheating device, the air output end of the low-temperature proton exchange membrane fuel cell is connected to the other air input end of the air humidification and preheating device, and the air output end of the air humidification and preheating device is connected to the air input end of the high-temperature proton exchange membrane fuel cell; the air output end of the high-temperature proton exchange membrane fuel cell is connected to the heat source input end of the air humidification and preheating device, and the heat source output end of the air humidification and preheating device is connected to the heat source input end of the air humidifier.

3. The combined system of LT-PEMFC and HT-PEMFC according to claim 2, characterized in that: The air humidifier also includes a heat source output end. The air humidifier includes an air cavity and a heating cavity. The air cavity is arranged on the heating cavity. A water bottle is arranged in the heating cavity. The opening of the water bottle is connected to the air cavity. The heat source input end and the heat source output end of the air humidifier are both arranged on the heating cavity. The air input end and the air output end of the air humidifier are both arranged on the air cavity.

4. The combined system of LT-PEMFC and HT-PEMFC according to claim 3, characterized in that: The air humidifier also includes a bottle cap, which matches the bottle mouth of the water bottle.

5. The combined system of LT-PEMFC and HT-PEMFC according to claim 1, characterized in that: The hydrogen recovery module includes a water separator and a circulation device, the input end of the water separator is connected to the hydrogen output end of the low-temperature proton exchange membrane fuel cell or the high-temperature proton exchange membrane fuel cell, the output end of the water separator is connected to the circulation device, and the output end of the circulation device is connected to the hydrogen mixer.

6. The combined system of LT-PEMFC and HT-PEMFC according to claim 5, characterized in that: It also includes an exhaust device, the input end of the exhaust device is connected to the output end of the circulation device.

7. The combined system of LT-PEMFC and HT-PEMFC according to claim 1, characterized in that: It also includes a tail gas treatment system, which is connected to the gas supply module, the coolant supply module, the hydrogen recovery module and the liquid heat exchange module for treating and utilizing the tail gas.

8. The combined system of LT-PEMFC and HT-PEMFC according to claim 7, characterized in that: The liquid heat exchange module includes a cold water storage tank, a heat exchange storage tank and a hot water storage tank. A transmission water pipe is arranged in the heat exchange storage tank. The outlet of the cold water storage tank is connected to the inlet of the transmission water pipe, and the inlet of the hot water storage tank is connected to the outlet of the transmission water pipe.

9. The combined system of LT-PEMFC and HT-PEMFC according to claim 8, characterized in that: The heat exchange storage tank is a vertical storage tank, the transmission water pipe is a vertical water pipe, the inlet of the transmission water pipe is at the bottom, and the outlet of the transmission water pipe is at the top; the transmission water pipe includes a first transmission water pipe and a second transmission water pipe; There is also a coolant pipe in the heat exchange tank, the inlet of the coolant pipe is arranged at the upper part of the heat exchange tank, and the outlet of the coolant pipe is arranged at the lower part of the heat exchange tank. The coolant pipe is wound around the outside of the first transmission water pipe from top to bottom, and the outlet of the coolant pipe is connected to the coolant supply device.

10. The combined system of LT-PEMFC and HT-PEMFC according to claim 9, characterized in that: The heat exchange tank also includes a heating pipe, the inlet of the heating pipe is arranged at the upper part of the heat exchange tank, the outlet of the heating pipe is arranged at the lower part of the heat exchange tank, the heating pipe is wound around the outside of the second transmission water pipe from top to bottom, the inlet of the heating pipe is connected to the exhaust gas treatment system, and a spacing space is provided between the heating pipe and the coolant pipe.

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