Heat recovery device of hydrogen fuel cell cogeneration system

Abstract

The utility model discloses a heat recovery device of a hydrogen fuel cell cogeneration system, which comprises an electric pile, a circulating water inlet pipe and a heating water pipe, and circulating water is provided in the circulating water inlet pipe. The heat recovery device further comprises a plate heat exchanger, a heat pump unit, a cold water tank and a hot water tank, circulating water of the circulating water inlet pipe sequentially penetrates through the heat pump unit, the cold water tank and the plate heat exchanger to enter the electric pile, and after flowing out of the electric pile, the circulating water sequentially passes through the plate heat exchanger, the heat pump unit and the hot water tank and finally enters the heating water pipe. A water inlet pump is arranged between the plate-type heat exchanger and the electric pile; a water outlet pump is arranged between the plate-type heat exchanger and the heat pump unit. According to the device, the energy utilization rate of the hydrogen fuel cell is improved, the energy generated when the electric pile works is recycled, and the recycled heat is reutilized in a heat supply or hot water form.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hydrogen fuel cell power generation management field, more specifically, it relates to a kind of heat recovery device of hydrogen fuel cell cogeneration system. BACKGROUND

[0002] With the determination of carbon peak and carbon neutralization target, in recent years, China's energy structure has begun to gradually transform, and the consumption proportion of renewable energy in primary energy has been continuously improved. Among many new energy sources, hydrogen energy has high energy density, no pollution and convenient transportation, and undoubtedly has broader application prospects in the future. At present, the most direct utilization method of hydrogen is to convert its chemical energy into electrical energy through proton exchange membrane fuel cell.

[0003] China's energy has long relied on oil, natural gas, coal and other fossil energy resources, which are limited and pollute the environment during use, so the country urgently needs new renewable energy to replace. Hydrogen fuel cell cogeneration provides a perfect solution. Excess electricity is used to produce hydrogen by electrolyzing water through photovoltaic or wind power generation, and hydrogen is stored. Hydrogen fuel cells are used to generate electricity during peak electricity consumption and fed back to the power grid. A large amount of heat is generated during hydrogen fuel cell power generation, and this part of energy can be recovered through cogeneration, which can most effectively utilize hydrogen energy fuel, and the entire process is pollution-free.

[0004] In recent years, the energy storage field has developed rapidly, especially in the lithium battery field. For the hydrogen fuel cell technology field, the fuel cell fixed power generation system is very suitable for the application scenario of energy storage power station. Hydrogen fuel cell energy storage power station includes photovoltaic power generation, hydrogen production by water electrolysis, hydrogen storage and hydrogen power generation. Hydrogen fuel cells play an important role in energy storage power stations.

[0005] The power generation efficiency of hydrogen fuel cell stack is usually between 40% and 60%, and most of the remaining part is released in the form of heat energy. In order to improve energy utilization, the utility model designs a heat recovery system. The recovered heat is delivered to residential areas in the form of heating or hot water. This system is especially suitable for areas that need heating in the north. SUMMARY

[0006] Invention purpose: to reasonably utilize the energy generated by the operating temperature of the hydrogen fuel cell stack. And the stack needs to be cooled in time when the operating temperature exceeds 72℃ to prevent damage to the stack and timely heat transfer. The utility model designs a heat recovery device of hydrogen fuel cell cogeneration system to replace the traditional heat dissipation device, reasonably utilizes the circulating water to take away the heat energy generated during power generation, and realizes recycling.

[0007] Technical solution: In order to realize the above-mentioned purposes, the utility model provides a kind of heat recovery device of hydrogen fuel cell cogeneration system, including electric pile, circulating water inlet pipe and heating water pipe, circulating water is provided in the circulating water inlet pipe.The heat recovery device further includes plate exchange, heat pump unit, cold water tank and hot water tank, the circulating water of circulating water inlet pipe passes heat pump unit, cold water tank, plate exchange in turn, enters electric pile, and after circulating water flows out electric pile, in turn pass plate exchange, heat pump unit and hot water tank again, finally enter heating water pipe.

[0008] Water pump is arranged between the plate exchange and electric pile, and water pump is arranged between the plate exchange and heat pump unit.

[0009] The circulating water is deionized water.

[0010] Heat exchange between plate exchange and electric pile, deionized water is driven to circulate by water pump, and heat is transferred from electric pile to plate exchange.Heat exchange between plate exchange and heat pump unit, water is driven to circulate by water pump, and heat is transferred to hot water tank by heat pump compressor work.Cooled water is temporarily stored in cold water tank, and can continue to circulate through plate exchange according to needs.Water in hot water tank is used comprehensively through heating water pipe.

[0011] When the heat of electric pile exceeds 72 DEG C in actual operation, water pump operates, and 65-72 DEG C deionized water in plate exchange is transported to electric pile, and the excess heat in electric pile is removed.The hot water from electric pile is cooled in plate exchange again.The deionized water between electric pile and plate exchange is recycled.

[0012] The left side circulating water of plate exchange reduces the temperature of deionized water on the right side from 72-92 DEG C to 65-72 DEG C.The left side circulating water is circulated between plate exchange, heat pump unit and cold water tank by water pump.The temperature of circulating water is reduced from 50-60 DEG C to 10-35 DEG C by compressor of heat pump unit.

[0013] The heat pump unit raises the temperature of circulating water from low temperature to about 90 DEG C, and then stores the excess hot water in hot water tank, which is used comprehensively through heating water pipe.

[0014] Beneficial effects: Compared with the prior art, the utility model has the beneficial effects as follows:

[0015] (1), the device improves the energy utilization rate of hydrogen fuel cell, and the energy generated during the operation of electric pile is recycled, and the recycled heat is reused in the form of heating or hot water.

[0016] (2), the pipeline layout of the device is simple, easy to assemble, and convenient to disassemble and replace. DESCRIPTION OF DRAWINGS

[0017] Figure 1This is a schematic diagram of the heat recovery device in a hydrogen fuel cell combined heat and power system. Detailed Implementation

[0018] The present invention will be described in detail below through a preferred embodiment, but the scope of protection of the present invention is not limited to the embodiment described.

[0019] like Figure 1 As shown, a heat recovery device for a hydrogen fuel cell combined heat and power system includes a fuel cell stack 1, a circulating water inlet pipe 7, and a heating water pipe 6. The circulating water inlet pipe 7 provides circulating water. The heat recovery device also includes a heat exchanger 2, a heat pump unit 4, a cold water tank 3, and a hot water tank 5. The circulating water in the circulating water inlet pipe 7 passes sequentially through the heat pump unit 4, the cold water tank 3, and the heat exchanger 2 before entering the fuel cell stack 1. After the circulating water flows out of the fuel cell stack 1, it passes sequentially through the heat exchanger 2, the heat pump unit 4, and the hot water tank 5 before finally entering the heating water pipe 6.

[0020] An inlet pump 9 is installed between the heat exchanger 2 and the fuel cell stack 1, and an outlet pump 8 is installed between the heat exchanger 2 and the heat pump unit 4. The circulating water is deionized water.

[0021] In actual operation, when the temperature of fuel cell stack 1 exceeds 72°C, the inlet pump 9 starts operating, delivering deionized water (65-72°C) from heat exchanger 2 to fuel cell stack 1 to remove excess heat. The hot water from fuel cell stack 1 then re-enters heat exchanger 2 for cooling. The deionized water between fuel cell stack 1 and heat exchanger 2 is recycled.

[0022] The circulating water on the left side of plate heat exchanger 2 cools the deionized water on the right side from 72-92℃ to 65-72℃. The circulating water on the left side circulates between plate heat exchanger 1, heat pump unit 4, and chilled water tank 5 via outlet pump 8. Heat pump unit 4 cools the circulating water from 50-60℃ to 10-35℃ using a compressor.

[0023] The heat pump unit 4 raises the temperature of the circulating water from a low temperature to about 90°C, and then stores the excess hot water in the hot water tank 5, which is then used for comprehensive utilization through the heating water pipe 6.

Claims

1. A heat recovery device of a hydrogen fuel cell cogeneration system, comprising a stack (1), a circulating water inlet pipe (7) and a heating water pipe (6), circulating water being provided in the circulating water inlet pipe (7), characterized in that: The heat recovery device further comprises a plate heat exchanger (2), a heat pump unit (4), a cold water tank (3) and a hot water tank (5), and the circulating water in the circulating water inlet pipe (7) sequentially passes through the heat pump unit (4), the cold water tank (3) and the plate heat exchanger (2), enters the electric pile (1), and then sequentially passes through the plate heat exchanger (2), the heat pump unit (4) and the hot water tank (5) after circulating water flows out of the electric pile (1), and finally enters the heating water pipe (6).

2. The heat recovery device of a hydrogen fuel cell cogeneration system according to claim 1, characterized by: The water inlet pump (9) is arranged between the plate heat exchanger (2) and the electric pile (1), and the water outlet pump (8) is arranged between the plate heat exchanger (2) and the heat pump unit (4).

3. The heat recovery device of a hydrogen fuel cell cogeneration system according to claim 1, characterized by: The circulating water is deionized water.

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