A solar hydrogen production coupled flue gas heat and mass comprehensive utilization system and control method

Abstract

The invention discloses a solar energy hydrogen production coupled flue gas heat and mass comprehensive utilization system and a control method. The system comprises a boiler, a flue gas condenser and a chimney connected in sequence on the flue gas side, a flue gas temperature thermal resistor at the flue gas condenser outlet, a compressor, a plate heat exchanger and a throttle valve connected in sequence to the flue gas condenser circulating medium side, a water supply inlet valve, a regulating valve and a water supply outlet valve connected in sequence to the plate heat exchanger water side; further comprising a water tank, a condensate pump, a water treatment tank, a purified water pump and an electrolysis device connected in sequence on the condensate water side; a water quality monitoring device located at the outlet of the water treatment tank; a dosing device and a variable frequency dosing pump connected to the water treatment tank; further comprising a photovoltaic device, a coil and a thermal resistor, an energy storage device connected to the photovoltaic device, etc. The invention can reduce the surface temperature of the photovoltaic panel and improve its photoelectric conversion efficiency. At the same time, it can deeply recover the heat and moisture in the flue gas. The condensate is used for producing hydrogen and oxygen from solar energy, thereby realizing comprehensive and efficient recycling of energy.

Description

Technical Field

[0001] The present invention belongs to the field of new energy technology and relates to a solar energy hydrogen production coupled with flue gas heat and mass comprehensive utilization system and control method, which can reduce the surface temperature of photovoltaic panels and improve their photoelectric conversion efficiency. At the same time, it can deeply recover the heat and moisture in the flue gas, and the condensed water is used for solar energy production of hydrogen and oxygen. Background Art

[0002] Photovoltaic technology is one of the hot spots in the research of solar energy utilization. Studies have shown that the photoelectric conversion efficiency of photovoltaic cells is 6% to 19%. The remaining energy is mainly accumulated in the battery panel in the form of heat, which causes the battery operating temperature to rise, thereby affecting the photovoltaic system. On the one hand, the increase in battery operating temperature leads to a decrease in photoelectric conversion efficiency. For every 1°C increase in battery temperature, the photoelectric conversion efficiency decreases by 0.4% to 0.5%; on the other hand, high temperature will accelerate the degradation of the photoinduction rate of the battery and cause permanent structural damage to it. Therefore, the operating temperature of the photovoltaic panel must be controlled. Related studies have shown that the use of photovoltaic panel cooling technology can increase the output power of the photovoltaic system by 4% to 10%.

[0003] In addition, with the continuous development of my country's energy transformation and upgrading, the utilization of waste heat resources has been widely used. Flue gas waste heat includes sensible heat and latent heat. At present, most boilers are equipped with energy-saving devices, and the sensible heat of flue gas is fully utilized, but the latent heat of flue gas is not utilized. The latent heat of flue gas accounts for about 11% of the low calorific value of fuel. Recovering the latent heat of flue gas can not only greatly improve the thermal efficiency of the unit, but also recover the moisture of flue gas, which has significant economic and environmental benefits. At present, the flue gas condensate is mainly used for boiler water replenishment, desulfurization tower water replenishment or direct discharge after treatment, resulting in a waste of water resources. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a solar energy hydrogen production coupled flue gas heat and mass comprehensive utilization system and control method. The system can reduce the surface temperature of photovoltaic panels and improve their photoelectric conversion efficiency. At the same time, it can deeply recover the heat and moisture in the flue gas, and the condensed water is used for solar energy to produce hydrogen and oxygen, thereby realizing comprehensive and efficient recycling of energy.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] A solar hydrogen production coupled flue gas heat and mass comprehensive utilization system, comprising a boiler 1, a flue gas condenser 2 and a chimney 3 connected in sequence on the flue gas side, a flue gas temperature resistor 28 arranged at the flue gas side outlet of the flue gas condenser 2, a compressor 4, a plate heat exchanger 5 and a throttle valve 6 connected in sequence to the circulating medium side of the flue gas condenser 2, a water supply inlet valve 7, a regulating valve 11 and a water supply outlet valve 8 connected in sequence to the water side of the plate heat exchanger 5; also comprising a heat network return valve 9 and a heat network outlet valve 10, wherein the outlet of the heat network return valve 9 is connected to the pipeline between the water supply inlet valve 7 and the regulating valve 11, and the inlet of the heat network outlet valve 10 is connected to the pipeline between the water side outlet of the plate heat exchanger 5 and the water supply outlet valve 8; also comprising a water tank 14, a condensate pump 15, a water treatment tank 16, a purified water pump 18 and an electrolysis device 19 connected in sequence on the condensate water side, wherein the water inlet of the water tank 14 is connected to the water supply outlet valve 8 of the plate heat exchanger 5; The condensate outlet of the flue gas condenser 2 is connected; it also includes a water quality monitoring device 17 located at the outlet of the water treatment box 16; it also includes a dosing device 20 and a variable frequency dosing pump 21 connected to the water treatment box 16; it also includes a photovoltaic device 22, a coil 23 arranged in the photovoltaic device 22 and a thermal resistor 24 connected to the photovoltaic device 22; it also includes an energy storage device 25 connected to the photovoltaic device 22, and the output side of the energy storage device 25 is connected to the electrolysis device 19; it also includes a cooling water inlet valve 12 and a cooling water outlet valve 13 respectively connected to the water side inlet and water side outlet of the coil 23, wherein the inlet of the cooling water inlet valve 12 is connected to the inlet of the regulating valve 11, and the outlet of the cooling water outlet valve 13 is connected to the outlet of the regulating valve 11; it also includes a hydrogen storage bottle 26 connected to the hydrogen outlet of the electrolysis device 19, and an oxygen storage bottle 27 connected to the oxygen outlet of the electrolysis device 19.

[0007] The boiler 1 is a gas boiler, a gas turbine, a coal-fired boiler or an oil-fired boiler.

[0008] The heat exchange form of the flue gas condenser 2 is spray tower heat exchange, plate heat exchange or tube heat exchange.

[0009] The regulating valve 11 is electrically or pneumatically regulated to track the temperature value of the thermal resistor 24 .

[0010] The water tank 14 is made of corrosion-resistant material.

[0011] In the control method of a solar energy hydrogen production coupled with flue gas heat and mass comprehensive utilization system, the power of the compressor 4 is automatically controlled by the flue gas temperature resistor 28 at the flue gas side outlet of the flue gas condenser 2. When the feedback value of the flue gas temperature resistor 28 is higher than the set value of the flue gas temperature resistor, the power of the compressor 4 is increased until the feedback value of the flue gas temperature resistor 28 reaches the set value of the flue gas temperature resistor; when the feedback value of the flue gas temperature resistor 28 is lower than the set value of the flue gas temperature resistor, the power of the compressor 4 is reduced until the feedback value of the flue gas temperature resistor 28 reaches the set value of the flue gas temperature resistor, thereby achieving the purpose of regulating the amount of condensed water; the condensed water is purified in the water treatment tank 16, and its water quality is monitored by the water quality monitoring device 17. When the water quality index is higher than the set value of the water quality index, the frequency of the variable frequency dosing pump 21 is increased, and the amount of medicine is increased until the water quality index reaches the set value of the water quality index; when the water quality index is lower than the set value of the water quality index, the frequency of the variable frequency dosing pump 21 is reduced. The frequency of the dosing pump 21 is increased, and the dosage of the dosing pump 21 is reduced until the water quality index reaches the set value of the water quality index; when the temperature value of the thermal resistor 24 of the photovoltaic device 22 is higher than the temperature set value, the cooling water inlet valve 12 and the cooling water outlet valve 13 are opened, and at the same time, the opening of the regulating valve 11 follows the temperature value of the thermal resistor 24. When the temperature value is higher than the temperature set value, the opening of the regulating valve 11 is reduced, and the amount of cooling water flowing through the photovoltaic device 22 is increased until the temperature value reaches the set value; when the temperature value is lower than the temperature set value, the opening of the regulating valve 11 is increased, and the amount of cooling water flowing through the photovoltaic device 22 is reduced until the temperature value reaches the temperature set value; when the entire system is supplying heat, the water supply inlet valve 7 and the water supply outlet valve 8 are closed, and the heat network return water valve 9 and the heat network outlet valve 10 are opened; when the entire system is not supplying heat, the heat network return water valve 9 and the heat network outlet valve 10 are closed, and the water supply inlet valve 7 and the water supply outlet valve 8 are opened.

[0012] The present invention has the following beneficial effects:

[0013] The solar energy hydrogen production coupled flue gas heat and mass comprehensive utilization system and control method described in the present invention, because the photovoltaic device is provided with a coil, boiler feed water is used as a cooling medium, and the surface temperature of the photovoltaic device is controlled in real time, it is possible to reduce the surface temperature of the photovoltaic panel and improve its photoelectric conversion efficiency. At the same time, because the system is provided with a flue gas condenser and uses a heat pump system to fully reduce the flue gas temperature, it is possible to deeply recover the heat and moisture in the flue gas, and the condensed water is used for solar energy to produce hydrogen and oxygen, thereby realizing comprehensive and efficient recycling of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a system diagram of the present invention, wherein 1 is a boiler, 2 is a flue gas condenser, 3 is a chimney, 4 is a compressor, 5 is a plate heat exchanger, 6 is a throttle valve, 7 is a water supply inlet valve, 8 is a water supply outlet valve, 9 is a heat network return valve, 10 is a heat network outlet valve, 11 is a regulating valve, 12 is a cooling water inlet valve, 13 is a cooling water outlet valve, 14 is a water tank, 15 is a condensate pump, 16 is a water treatment tank, 17 is a water quality measuring device, 18 is a purified water pump, 19 is an electrolysis device, 20 is a dosing device, 21 is a variable frequency dosing pump, 22 is a photovoltaic device, 23 is a coil, 24 is a thermal resistor, 25 is an energy storage device, 26 is a hydrogen storage bottle, 27 is an oxygen storage bottle, and 28 is a thermal resistor. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0016] A solar hydrogen production coupled flue gas heat and mass comprehensive utilization system, comprising a boiler 1, a flue gas condenser 2 and a chimney 3 connected in sequence on the flue gas side, a flue gas temperature resistor 28 arranged at the flue gas side outlet of the flue gas condenser 2, a compressor 4, a plate heat exchanger 5 and a throttle valve 6 connected in sequence to the circulating medium side of the flue gas condenser 2, a water supply inlet valve 7, a regulating valve 11 and a water supply outlet valve 8 connected in sequence to the water side of the plate heat exchanger 5; also comprising a heat network return valve 9 and a heat network outlet valve 10, wherein the outlet of the heat network return valve 9 is connected to the pipeline between the water supply inlet valve 7 and the regulating valve 11, and the inlet of the heat network outlet valve 10 is connected to the pipeline between the water side outlet of the plate heat exchanger 5 and the water supply outlet valve 8; also comprising a water tank 14, a condensate pump 15, a water treatment tank 16, a purified water pump 18 and an electrolysis device 19 connected in sequence on the condensate water side, wherein The water inlet of the water tank 14 is connected to the condensed water outlet of the flue gas condenser 2; it also includes a water quality monitoring device 17 located at the outlet of the water treatment tank 16; it also includes a dosing device 20 and a variable frequency dosing pump 21 connected to the water treatment tank 16; it also includes a photovoltaic device 22, a coil 23 and a thermal resistor 24; it also includes an energy storage device 25 connected to the photovoltaic device 22, and the output side of the energy storage device 25 is connected to the electrolysis device 19; it also includes a cooling water inlet valve 12 and a cooling water outlet valve 13 respectively connected to the water side inlet and water side outlet of the coil 21, wherein the inlet of the cooling water inlet valve 12 is connected to the inlet of the regulating valve 11, and the outlet of the cooling water outlet valve 13 is connected to the outlet of the regulating valve 11; it also includes a hydrogen storage bottle 26 connected to the hydrogen outlet of the electrolysis device 19; it also includes an oxygen storage bottle 27 connected to the oxygen outlet of the electrolysis device 19.

[0017] The working process of the present invention is:

[0018] The power of the compressor 4 is automatically controlled by the smoke temperature resistor 28 at the smoke side outlet of the smoke condenser 2. When the feedback value of the smoke temperature resistor 28 is higher than the set value of the smoke temperature resistor, the power of the compressor 4 is increased until the feedback value of the smoke temperature resistor 28 reaches the set value of the smoke temperature resistor; when the feedback value of the smoke temperature resistor 28 is lower than the set value of the smoke temperature resistor, the power of the compressor 4 is reduced until the feedback value of the smoke temperature resistor 28 reaches the set value of the smoke temperature resistor, thereby achieving the purpose of regulating the amount of condensed water. The condensed water is purified in the water treatment tank 16, and its water quality is monitored by the water quality monitoring device 17. When the water quality index is higher than the set value, the frequency of the variable frequency dosing pump 21 is increased, and the amount of medicine is increased until the water quality index reaches the set value of the water quality index; when the water quality index is lower than the set value of the water quality index, the frequency of the variable frequency dosing pump 21 is reduced, and the amount of medicine is reduced until the water quality index reaches the set value of the water quality index. When the temperature value of the thermal resistor 24 of the photovoltaic device 22 is higher than the temperature setting value, the cooling water inlet valve 12 and the cooling water outlet valve 13 are opened, and the opening of the regulating valve 11 follows the temperature value of the thermal resistor 24. When the temperature value is higher than the temperature setting value, the opening of the regulating valve 11 is reduced to increase the amount of cooling water flowing through the photovoltaic device 22 until the temperature value reaches the temperature setting value; when the temperature value is lower than the temperature setting value, the opening of the regulating valve 11 is increased to reduce the amount of cooling water flowing through the photovoltaic device 22 until the temperature value reaches the temperature setting value. When the entire system is heating, the water supply inlet valve 7 and the water supply outlet valve 8 are closed, and the heat network return water valve 9 and the heat network outlet valve 10 are opened; when the entire system is not heating, the heat network return water valve 9 and the heat network outlet valve 10 are closed, and the water supply inlet valve 7 and the water supply outlet valve 8 are opened.

Claims

1. A solar hydrogen production coupled with flue gas heat and mass comprehensive utilization system, characterized in that: The system can reduce the surface temperature of the photovoltaic panel and improve its photoelectric conversion efficiency. At the same time, it can deeply recover the heat and moisture in the flue gas, and the condensed water is used to produce hydrogen and oxygen by solar energy. The system comprises a boiler (1), a flue gas condenser (2) and a chimney (3) which are connected in sequence on the flue gas side, a flue gas temperature resistor (28) arranged at the flue gas outlet of the flue gas condenser (2), a compressor (4), a plate heat exchanger (5) and a throttle valve (6) which are connected in sequence to the circulating medium side of the flue gas condenser (2), and a water side of the plate heat exchanger (5). The heat exchanger (5) further comprises a water supply inlet valve (7), a regulating valve (11) and a water supply outlet valve (8); further comprises a heat network return valve (9) and a heat network outlet valve (10), wherein the outlet of the heat network return valve (9) is connected to a pipeline between the water supply inlet valve (7) and the regulating valve (11), and the inlet of the heat network outlet valve (10) is connected to a pipeline between the water side outlet of the plate heat exchanger (5) and the water supply outlet valve (8); further comprises a water tank (14), a condensate pump (15), a water treatment tank (16), a purified water pump (18) and an electric A decomposition device (19), wherein the water inlet of the water tank (14) is connected to the condensed water outlet of the flue gas condenser (2); further comprising a water quality monitoring device (17) located at the outlet of the water treatment tank (16); further comprising a dosing device (20) and a variable frequency dosing pump (21) connected to the water treatment tank (16); further comprising a photovoltaic device (22), a coil (23) disposed in the photovoltaic device (22), and a thermal resistor (24) connected to the photovoltaic device (22); further comprising an energy storage device (25) connected to the photovoltaic device (22), the energy storage device (25) The output side of the device (25) is connected to the electrolysis device (19); it also includes a cooling water inlet valve (12) and a cooling water outlet valve (13) which are respectively connected to the water side inlet and the water side outlet of the coil (23), wherein the inlet of the cooling water inlet valve (12) is connected to the inlet of the regulating valve (11), and the outlet of the cooling water outlet valve (13) is connected to the outlet of the regulating valve (11); it also includes a hydrogen storage bottle (26) which is connected to the hydrogen outlet of the electrolysis device (19), and an oxygen storage bottle (27) which is connected to the oxygen outlet of the electrolysis device (19); The boiler (1) refers to a gas boiler or a gas turbine or a coal-fired boiler or an oil-fired boiler; The heat exchange form of the flue gas condenser (2) is spray tower heat exchange or plate heat exchanger tube heat exchange.

2. According to claim 1, a solar energy hydrogen production coupled with flue gas heat and mass comprehensive utilization system is characterized in that: The regulating valve (11) is electrically or pneumatically regulated to track the temperature value of the thermal resistor (24).

3. The solar energy hydrogen production coupled with flue gas heat and mass comprehensive utilization system according to claim 1 is characterized in that: The water tank (14) is made of corrosion-resistant material.

4. A control method for a solar hydrogen production coupled with flue gas heat and mass comprehensive utilization system according to any one of claims 1 to 3, characterized in that: The power of the compressor (4) is automatically controlled by the smoke temperature resistor (28) at the smoke side outlet of the smoke condenser (2). When the feedback value of the smoke temperature resistor (28) is higher than the set value of the smoke temperature resistor, the power of the compressor (4) is increased until the feedback value of the smoke temperature resistor (28) reaches the set value of the smoke temperature resistor; when the feedback value of the smoke temperature resistor (28) is lower than the set value of the smoke temperature resistor, the power of the compressor (4) is reduced until the feedback value of the smoke temperature resistor (28) reaches the set value of the smoke temperature resistor, thereby achieving the purpose of regulating the amount of condensed water; the condensed water is purified in the water treatment tank (16), and its water quality is monitored by the water quality monitoring device (17). When the water quality index is higher than the set value of the water quality index, the frequency of the variable frequency dosing pump (21) is increased, and the amount of the drug is increased until the water quality index reaches the set value of the water quality index; when the water quality index is lower than the set value of the water quality index, the frequency of the variable frequency dosing pump (21) is reduced, and the amount of the drug is reduced until the water quality index reaches the set value of the water quality index. When the temperature value of the thermal resistor (24) of the photovoltaic device (22) is higher than the temperature setting value, the cooling water inlet valve (12) and the cooling water outlet valve (13) are opened, and at the same time, the opening of the regulating valve (11) follows the temperature value of the thermal resistor (24); when the temperature value is higher than the temperature setting value, the opening of the regulating valve (11) is reduced, and the amount of cooling water flowing through the photovoltaic device (22) is increased until the temperature value reaches the temperature setting value; when the temperature value is lower than the temperature setting value, the opening of the regulating valve (11) is increased, and the amount of cooling water flowing through the photovoltaic device (22) is reduced until the temperature value reaches the temperature setting value; when the entire system is supplying heat, the water supply inlet valve (7) and the water supply outlet valve (8) are closed, and the heating network return water valve (9) and the heating network outlet valve (10) are opened; when the entire system is not supplying heat, the heating network return water valve (9) and the heating network outlet valve (10) are closed, and the water supply inlet valve (7) and the water supply outlet valve (8) are opened.

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