Photovoltaic-thermal integrated energy supply system and operation control method for industrial park

Abstract

The present invention relates to a photovoltaic-thermal integrated energy supply system applicable to building clusters in industrial parks. The system consists of PV / T modules, a water source heat pump, a lithium bromide absorption chiller, a constant temperature water tank, a hot water storage tank, a heat exchanger, an air preheater, and an air heater. The roof layout uses non-concentrating double-glass double-sided glass flow channel PV / T modules as the core part of the system to provide power generation and low-temperature hot water. A gas plant waste heat-coupled water source heat pump is used as an auxiliary heating device for the minimum working temperature heat load of employee dormitories, comprehensive buildings, and large workshops in the industrial park. The lithium bromide absorption chiller meets the cooling load of employee dormitories and the comprehensive building. The waste heat of the heating return water and the waste heat of the gas plant are used to meet the industrial heat demand of the drying process production line and assist in the heating and cooling requirements of employee dormitories and comprehensive buildings.

Description

Technical Field

[0001] The present invention belongs to the field of comprehensive utilization of solar energy, and particularly relates to a photovoltaic-thermal integrated energy supply system and an operation control method for an industrial park building cluster. Background Art

[0002] With the rapid transformation of energy towards clean and low-carbon directions. Currently, industrial parks have high energy consumption and there is a huge space for energy conservation and consumption reduction. With the strong promotion of rooftop distributed photovoltaics, the rooftops of industrial park building clusters can be fully utilized, but the rooftop space is limited, and there is a situation where photovoltaics and solar thermal energy compete for rooftop resources. Photovoltaic conversion can usually only convert sunlight within the visible light wavelength range, and the rest is dissipated in the form of heat energy. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a photovoltaic-thermal integrated energy supply system and an operation control method for an industrial park building cluster, which can achieve dual thermal and electrical benefits without increasing the floor area and improve the comprehensive utilization efficiency of solar energy.

[0004] The technical solution adopted by the present invention to solve the technical problems is as follows:

[0005] The first aspect of the present invention provides a photovoltaic-thermal integrated energy supply system suitable for an industrial park building cluster, which is characterized in that it includes PV / T components, a hot water storage tank, a constant temperature water tank, a primary air preheater, a secondary air preheater, a heater, a water source heat pump, a heating water tank, a lithium bromide absorption chiller, a cooling tower, a cold water supply tank and a plurality of valves;

[0006] The water outlet pipeline of the PV / T component is divided into two paths through a valve. The first path is connected to the water inlet of the primary air preheater through a valve. The water outlet pipeline of the primary air preheater is connected to the inlet of the hot water storage tank. The outlet pipeline of the hot water storage tank is connected to the water return port of the PV / T component. The second path is connected to the inlet of the constant temperature water tank through a valve. The outlet pipeline of the constant temperature water tank is divided into two paths through a valve. One path is connected to domestic hot water, and the other path is divided into two paths through a valve. One path is connected to the water inlet of the heater, and the other path is sequentially connected to the water inlet of the primary air preheater through a valve;

[0007] The heater has a flue gas inlet, a flue gas outlet, a water inlet, and a water outlet. The water outlet of the heater is divided into two paths through a valve. One path is connected to the a inlet of the lithium bromide absorption chiller, and the other path is divided into two paths through a valve. One path is connected to the m inlet of the water source heat pump, and the other path is divided into two paths through a valve, a heating load, and a valve. One path is connected to the inlet of the heating water tank, and the other path is divided into two paths through a valve. One path is connected to the inlet of the constant temperature water tank through two valves, and the other path is sequentially connected to the primary air preheater through three valves;

[0008] The water source heat pump has an m inlet, an n outlet, an o outlet, and a p inlet. The pipeline of the n outlet of the water source heat pump is connected to the primary air preheater through three valves. The p inlet of the water source heat pump is connected to the outlet of the heating water tank. The o outlet of the water source heat pump is connected to the heating load through a valve.

[0009] The lithium bromide absorption chiller has an a inlet, a b outlet, a c inlet, a d outlet, an e inlet, and an f outlet. The pipeline of the b outlet of the lithium bromide absorption chiller is connected to the constant temperature water tank through a valve. The c inlet of the lithium bromide absorption chiller is connected to the outlet of the chilled water supply tank. The d outlet of the lithium bromide absorption chiller is connected to the cooling load. The cooling load is connected to the inlet of the chilled water supply tank. The e inlet and f outlet of the lithium bromide absorption chiller are connected to the cooling tower.

[0010] The air inlet pipeline is connected to the air inlet of the primary air preheater. The air outlet of the primary air preheater is connected to the air inlet of the secondary air preheater. The air outlet of the secondary air preheater is connected to the drying process flow. The secondary air preheater also has a flue gas inlet and a flue gas outlet.

[0011] The second aspect of the present invention is to provide an energy supply method for a photovoltaic-thermal integrated energy supply system applicable to industrial park building clusters, which is characterized in that after the PV / T module receives irradiation, it generates electricity and heat. When the irradiation is sufficient, the hot water exported from the PV / T module is directly used as the domestic hot water in the park. The return water with a certain temperature exchanges heat with the air entering the drying system through the primary air preheater of the drying system and then flows back to the hot water storage tank. Then, it is driven by a variable frequency water pump and enters the PV / T module to complete the heat exchange cycle. When the irradiation is insufficient, the waste heat of the gas plant exhaust gas is used as a heat source for auxiliary heating to provide heat sources for domestic hot water and building cooling and heating loads.

[0012] The cooling load is provided by the lithium bromide absorption chiller. The heat source of the lithium bromide absorption chiller is assisted by flue gas supply. The hot water exported from the PV / T module first enters the secondary heater and is heated once by the low-temperature flue gas at the outlet of the primary heater, and then enters the primary heater and is heated twice by the high-temperature flue gas introduced from the outside, and finally serves as the heat source of the lithium bromide absorption chiller.

[0013] The industrial heat load of the drying process pipeline is provided by the return water of the hot water storage tank that has completed the heat exchange of the building load and the heat exchange with the flue gas. The air in the drying system is driven by a fan and first passes through the primary air preheater to exchange heat with the return water of the hot water storage tank, recovering the heat of the low-temperature hot water after building heating / cooling, and then passes through the secondary air preheater to exchange heat with the flue gas. The flue gas flow is determined according to the outlet air temperature of the secondary air preheater. If the heated air still does not meet the temperature requirements, it is further heated by the air heater to finally meet the drying process requirements of the drying process pipeline.

[0014] The third aspect of the present invention is to provide a control method for a photovoltaic-thermal integrated energy supply system applicable to industrial park building clusters, characterized in that

[0015] When the system enters the heating mode, three load-side control strategies are adopted in the industrial area, which are specifically described as follows:

[0016] Control strategy one: When the temperature T1 of the constant temperature water tank is greater than or equal to 70 °C, it is the direct supply mode of the PV / T system at this time, and the flue gas waste heat recovery system is not put into operation;

[0017] Control strategy two: When the temperature T2 of the heating water heated by the flue gas waste heat is greater than or equal to 40 °C, it is the direct supply mode of the PV / T system at this time, and the flue gas waste heat recovery system is put into operation;

[0018] Control strategy three: When the temperature T2 of the heating water heated by the flue gas waste heat is lower than 40 °C, auxiliary heating equipment is required.

[0019] When the system enters the cooling mode, two load-side control strategies are adopted in the industrial area, which are specifically described as follows:

[0020] Control strategy one: When the temperature T1 of the constant temperature water tank is greater than or equal to 85 °C, the PV / T system directly serves as the heat source of the single-effect absorption-type lithium bromide refrigerator;

[0021] Control strategy two: When the temperature T1 of the constant temperature water tank is less than or equal to 85 °C, the PV / T system and the flue gas waste heat recovery system are connected in series as the heat source of the single-effect absorption-type lithium bromide refrigerator;

[0022] Control strategy three: When the temperature T2 heated by the flue gas waste heat is less than 70 °C, electric air conditioning refrigeration is directly adopted.

[0023] The operation control of the system heat source side characterizes the heat load demand according to the liquid level of the constant temperature water tank, and divides the heat source side control strategy into two control modes: heat priority and electricity priority.

[0024] Heat priority: When the liquid level of the constant temperature water tank is low, the rotation speed of the cooling circulation water pump of the PV / T module is reduced. In the heating condition, if the heat generated by the PV / T module is still difficult to meet the heat load demand, the target value of the inlet water temperature of the constant temperature water tank is further reduced, the valve position of the regulating valve in front of the constant temperature water tank is adjusted, and the water with a slightly lower temperature is introduced into the constant temperature water tank, and then the temperature is adjusted through the water source heat pump, so as to ensure that the heat load demand is met by sacrificing the power of the water source heat pump. In the cooling condition, if the heat generated by the PV / T module is still difficult to meet the needs of absorption refrigeration, in order to ensure the safe and stable operation of the absorption refrigeration equipment, the regulating valve in front of the constant temperature water tank is not further adjusted;

[0025] Electricity priority: When the liquid level in the constant temperature water tank is high, the target temperature of the cooling water at the outlet of the PV / T module is reduced, the rotational speed of the cooling water circulation pump of the PV / T module is increased. At the same time, the constant temperature water tank will stop admitting hot water, and the PV / T cooling water directly returns to the hot water storage tank after cooling the module, that is, the valve position of the regulating valve before the constant temperature water tank is adjusted.

[0026] The advantages and positive effects of the present invention are as follows:

[0027] 1. The present invention makes full use of the rooftop solar energy resources, arranges photovoltaic-thermal integrated (PV / T) modules, and couples other auxiliary energy system devices such as water source heat pumps, lithium bromide absorption chillers, constant temperature water tanks, hot water storage tanks, heat exchangers, air preheaters, and air heaters to meet the diverse energy consumption needs of industrial parks throughout the seasons.

[0028] 2. In view of the energy consumption characteristics of industrial parks, starting from the load side and the heat source side, the present invention designs the operation control strategy of the system under full-season working conditions to meet the balanced operation of the load side and the energy consumption side, and realizes the automatic control operation of the system. Brief Description of the Drawings

[0029] Figure 1 Schematic diagram of a photovoltaic-thermal integrated energy supply system according to an embodiment of the present invention;

[0030] Figure 2 Flow chart of the heating control strategy of the photovoltaic-thermal integrated energy supply system for an industrial park building cluster according to an embodiment of the present invention;

[0031] Figure 3 Flow chart of the cooling control strategy of the photovoltaic-thermal integrated energy supply system for an industrial park building cluster according to an embodiment of the present invention.

[0032] Among them, the above-mentioned drawings include the following reference numerals:

[0033] 1 is the PV / T module, 2 is the hot water storage tank, 3 is the constant temperature water tank, 4 is the primary air preheater, 5 is the secondary air preheater, 6 is the heater, 7 is the water source heat pump, 8 is the heating load, 9 is the heating water tank, 10 is the lithium bromide absorption chiller, 11 is the cooling tower, 12 is the cooling load, 13 is the chilled water tank, and 21 - 33 are valves. Detailed Embodiments

[0034] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0035] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0036] The present invention provides a photovoltaic-thermal integrated energy supply system applicable to building clusters in industrial parks. The system includes a PV / T module 1, a hot water storage tank 2, a constant temperature water tank 3, a primary air preheater 4, a secondary air preheater 5, a heater 6, a water source heat pump 7, a heating water tank 9, a lithium bromide absorption chiller 10, a cooling tower 11, and a chilled water supply tank 13.

[0037] The water outlet pipeline of the PV / T module 1 is divided into two paths through a valve 21. The first path is connected to the water inlet of the primary air preheater 4 through a valve 24. The water outlet pipeline of the primary air preheater 4 is connected to the inlet of the hot water storage tank 2. The outlet pipeline of the hot water storage tank 2 is connected to the water return port of the PV / T module 1. The second path is connected to the inlet of the constant temperature water tank 3 through valves 22 and 23. The outlet pipeline of the constant temperature water tank 3 is divided into two paths through a valve 33. One path is connected to domestic hot water, and the other path is divided into two paths through a valve 32. One path is connected to the water inlet of the heater 6, and the other path is successively connected to the water inlet of the primary air preheater 4 through valves 25 and 24.

[0038] The heater 6 has a flue gas inlet, a flue gas outlet, a water inlet, and a water outlet. The water outlet of the heater 6 is divided into two paths through a valve 27. One path is connected to the a inlet of the lithium bromide absorption chiller 10, and the other path is divided into two paths through a valve 28. One path is connected to the m inlet of the water source heat pump 7, and the other path is divided into two paths after passing through valves 29, a heating load 8, and a valve 30. One path is connected to the inlet of the heating water tank 9, and the other path is divided into two paths through a valve 31. One path is connected to the inlet of the constant temperature water tank 3 through valves 22 and 23, and the other path is successively connected to the primary air preheater 4 through valves 26, 25, and 24.

[0039] The water source heat pump 7 has an m inlet, an n outlet, an o outlet, and a p inlet. The n outlet pipeline of the water source heat pump 7 is connected to the primary air preheater 4 through valves 26, 25, and 24. The p inlet of the water source heat pump 7 is connected to the outlet of the heating water tank 9. The o outlet of the water source heat pump 7 is connected to the heating load through a valve 29.

[0040] The lithium bromide absorption chiller 10 has an a inlet, a b outlet, a c inlet, a d outlet, an e inlet, and an f outlet. The b outlet pipeline of the lithium bromide absorption chiller 10 is connected to the constant temperature water tank 3 through a valve 23. The c inlet of the lithium bromide absorption chiller 10 is connected to the outlet of the chilled water supply tank 13. The d outlet of the lithium bromide absorption chiller 10 is connected to a cooling load 12. The cooling load 12 is connected to the inlet of the chilled water supply tank 13. The e inlet and f outlet of the lithium bromide absorption chiller 10 are connected to the cooling tower 11.

[0041] The air inlet pipeline is connected to the air inlet of the primary air preheater 4. The air outlet of the primary air preheater 4 is connected to the air inlet of the secondary air preheater 5. The air outlet of the secondary air preheater 5 is connected to the drying process flow. The secondary air preheater 5 also has a flue gas inlet and a flue gas outlet.

[0042] The working principle of the above functional system is as follows:

[0043] (1) After receiving irradiation, the PV / T module 1 generates electricity and heat. When the irradiation is sufficient, the hot water at the outlet of the PV / T module 1 is directly supplied to the staff dormitory and the comprehensive building to meet the heating needs of the staff dormitory and the comprehensive building. The return water with a certain temperature exchanges heat with the air entering the drying system through the primary air preheater 4 of the drying system, then flows back to the hot water storage tank 2, and is driven by a variable frequency water pump to enter the PV / T to complete the heat exchange cycle. When the irradiation is insufficient, the waste heat of the gas plant's exhaust gas is used as a heat source for auxiliary heating to provide heat sources for domestic hot water and the heating and cooling loads of the building.

[0044] (2) The cooling load is met by the lithium bromide absorption chiller 10, and the heat source of the lithium bromide absorption chiller 10 is supplied by the flue gas for assistance. The hot water at the outlet of the PV / T module 1 first enters the secondary heater and is heated once by the low-temperature flue gas at the outlet of the primary heater, then enters the primary heater and is heated twice by the high-temperature flue gas introduced from the outside, and finally serves as the heat source of the lithium bromide absorption chiller 10.

[0045] (3) The industrial heat load of the drying process line is met by the heat exchange between the return water of the hot water storage tank 2 that has completed the building load heat exchange and the flue gas. The air in the drying system is driven by a fan, first passes through the primary air preheater 4 to exchange heat with the return water of the hot water storage tank 2, recovering the heat of the low-temperature hot water after building heating / cooling, and then passes through the secondary air preheater 5 to exchange heat with the flue gas. The flue gas flow is determined according to the outlet air temperature of the secondary air preheater 5. If the heated air still does not meet the temperature requirements, it is further assisted by the air heater 6 for heating, and finally used to meet the drying process of the drying process line.

[0046] The roof layout uses the non-concentrating double-glass double-sided glass flow PV / T module 1 as the core part of the system to provide power generation and low-temperature hot water; the waste heat of the gas plant's exhaust gas coupled with the water source heat pump 7 is used as an auxiliary heating device for the minimum working temperature heat loads of the staff dormitory, comprehensive building and large workshops in the industrial park. The lithium bromide absorption chiller 10 meets the cooling load of the staff dormitory and the cooling load of the comprehensive building, and uses the waste heat of the heating return water and the waste heat of the gas plant's exhaust gas to meet the industrial heat demand of the drying process line and assist the heating and cooling needs of the staff dormitory and the comprehensive building.

[0047] To ensure the normal operation of the entire system, the control mode of the system is mainly divided into load-side control and heat-source-side control.

[0048] The operation control on the load side of the system is achieved based on two parameters: the temperature at the outlet of the constant temperature water tank 3 and the water temperature after being heated by the flue gas waste heat. When the system enters the heating mode, three load-side control strategies can be adopted in the industrial area, which can be represented by Figure 2 and are specifically described as follows:

[0049] Control strategy 1: When the temperature T1 of the constant temperature water tank 3 is greater than or equal to 70 °C, it is the direct supply mode of the PV / T system at this time, and the flue gas waste heat recovery system is not put into operation. In this mode, the PV / T system directly serves as the heat source for building heating to ensure that the building load meets the demand.

[0050] Control strategy 2: When the temperature T2 of the heating water after being heated by the flue gas waste heat is greater than or equal to 40 °C, it is the direct supply mode of the PV / T system at this time, and the flue gas waste heat recovery system is put into operation. In this mode, the PV / T system and the flue gas waste heat recovery system are connected in series as the heat source for building heating to ensure that the building load meets the demand.

[0051] Control strategy 3: When the temperature T2 of the heating water after being heated by the flue gas waste heat is lower than 40 °C, after the water source provided by the PV / T system is heated by the flue gas waste heat recovery system, it still cannot meet the demand of the building heat load, and auxiliary heating equipment is required. For the above reasons, at this time, the outlet water of the flue gas waste heat recovery system can be used as the heat source water for the low-temperature water source heat pump 7. This coupling method can not only improve the comprehensive utilization efficiency of the PV / T system, but also increase the COP value of the water source heat pump 7 unit.

[0052] When the system enters the cooling mode, two load-side control strategies can be adopted in the industrial area, which can be represented by Figure 3 and are specifically described as follows:

[0053] Control strategy 1: When the temperature T1 of the constant temperature water tank 3 is greater than or equal to 85 °C, it is the direct supply mode of the PV / T system at this time, and the flue gas waste heat recovery system is not put into operation. In this mode, the PV / T system directly serves as the heat source for the single-effect absorption type lithium bromide refrigerator to ensure that the building cooling meets the demand.

[0054] Control strategy 2: When the temperature T1 of the constant temperature water tank 3 is less than or equal to 85 °C, it is the direct supply mode of the PV / T system at this time, and the flue gas waste heat recovery system is put into operation. In this mode, the PV / T system and the flue gas waste heat recovery system are connected in series as the heat source for the single-effect absorption type lithium bromide refrigerator to ensure that the building cooling meets the demand.

[0055] Control strategy 3: When the temperature T2 after being heated by the flue gas waste heat is less than 70 °C, since the efficiency of the high-temperature water source heat pump 7 is not high at this time, the single-effect absorption type lithium bromide refrigerator is no longer started, and the electric air conditioner is directly used for refrigeration. When actually designing the integrated energy system, the capacities of the constant temperature water tank 3 and the hot water storage tank 2 should be adjusted to avoid this working condition.

[0056] In addition to the heating and cooling load modes, the system also needs to provide high-temperature air for the drying process. The specific drying process flow is as follows: The air first passes through the air preheater and exchanges heat with the return water of the building load, cooling the working fluid while heating the air, which is beneficial to further reduce the temperature of the PV modules. Then the air enters the flue gas heat exchanger and exchanges heat with the flue gas to further increase the air temperature. At this time, the flue gas flow is adjusted by the flue gas flow regulating valve and automatically controlled by the PID controller. The target value of the controller is set as the temperature required for the drying process, and the input value is the inlet temperature of the air heater 6. Finally, it enters the air heater 6, and the air temperature is raised to the target air temperature required for the drying process by using electric energy. The output power of the air heater 6 is automatically controlled by the PID controller.

[0057] The operation control of the heat source side of the system characterizes the heat load demand according to the liquid level of the constant temperature water tank 3. To cope with different heating and cooling demands, the heat source side control strategy is divided into two control modes: heat priority and electricity priority.

[0058] Heat priority: When the liquid level of the constant temperature water tank 3 is low, a large amount of hot water is consumed through heating, cooling, or domestic water use, and the current operating state of the solar thermoelectric cogeneration system is about to be unable to meet the heat load demand. At this time, in order to improve the heating efficiency, it is necessary to sacrifice the current electrical efficiency of the PV modules and increase the target temperature of the cooling water at the outlet of the PV / T module 1, that is, reduce the rotation speed of the cooling water circulation pump of the PV / T module 1. In the heating condition, if the heat generated by the PV / T module 1 is still difficult to meet the heat load requirement, the target value of the inlet temperature of the constant temperature water tank 3 is further reduced, that is, the valve position of the regulating valve in front of the constant temperature water tank 3 is adjusted, and the water with a slightly lower temperature is introduced into the constant temperature water tank 3, and then the temperature is adjusted by the water source heat pump 7 to ensure that the heat load demand is met by sacrificing the power of the water source heat pump 7. In the cooling condition, if the heat generated by the PV / T module 1 is still difficult to meet the needs of the absorption refrigeration, in order to ensure the safe and stable operation of the absorption refrigeration equipment, the regulating valve in front of the constant temperature water tank 3 is not further adjusted.

[0059] Electricity priority: When the liquid level of the constant temperature water tank 3 is high, only a small amount of hot water is consumed, the current heat demand of the system is low, and the water storage capacity of the constant temperature water tank 3 can also meet the heat load demand for a period of time. At this time, in order to improve the power generation efficiency, the target temperature of the cooling water at the outlet of the PV / T module 1 can be reduced, that is, the rotation speed of the cooling water circulation pump of the PV / T module 1 is increased. At the same time, the constant temperature water tank 3 will stop entering hot water, and the PV / T cooling water will directly return to the hot water storage tank 2 after cooling the module, that is, the valve position of the regulating valve in front of the constant temperature water tank 3 is adjusted.

[0060] The present invention establishes an integrated building cluster photovoltaic and solar thermal energy supply system at the industrial park level, considering the building energy consumption load and drying energy consumption load in the park, and expanding the application of solar energy comprehensive utilization in a wider field and a larger area.

[0061] The present invention provides control strategies for the system on the load side and the heat source side. On the load side, the outlet temperature of the constant temperature water tank 3 and the water temperature after being heated by the flue gas waste heat are used as control parameters for operation regulation. On the heat source side, the inlet water temperature of the constant temperature water tank 3 is used as the control parameter for operation regulation, realizing the automatic operation control and temperature operation of the system.

[0062] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and changes can be made to the present invention by those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A photovoltaic-thermal integrated energy supply system applicable to industrial park building clusters, characterized in that: it includes a PV / T module (1), a hot water storage tank (2), a constant temperature water tank (3), a primary air preheater (4), a secondary air preheater (5), a heater (6), a water source heat pump (7), a heating water tank (9), a lithium bromide absorption chiller (10), a cooling tower (11), a chilled water supply tank (13) and multiple valves; The outlet pipeline of the PV / T module (1) is divided into two paths through a valve (21). The first path is connected to the water inlet of the primary air preheater (4) through a valve (24). The water outlet pipeline of the primary air preheater (4) is connected to the inlet of the hot water storage tank (2). The outlet pipeline of the hot water storage tank (2) is connected to the water return port of the PV / T module (1). The second path is connected to the inlet of the constant temperature water tank (3) through valves (22) and (23). The outlet pipeline of the constant temperature water tank (3) is divided into two paths through a valve (33). One path is connected to domestic hot water, and the other path is divided into two paths through a valve (32). One path is connected to the water inlet of the heater (6), and the other path is successively connected to the water inlet of the primary air preheater (4) through valves (25) and (24); The heater (6) has a flue gas inlet, a flue gas outlet, a water inlet, and a water outlet. The water outlet of the heater (6) is divided into two paths through a valve (27). One path is connected to the a inlet of the lithium bromide absorption chiller (10), and the other path is divided into two paths through a valve (28). One path is connected to the m inlet of the water source heat pump (7), and the other path is divided into two paths after passing through valves (29), a heating load (8), and a valve (30). One path is connected to the inlet of the heating water tank (9), and the other path is divided into two paths through a valve (31). One path is connected to the inlet of the constant temperature water tank (3) through valves (22) and (23), and the other path is successively connected to the primary air preheater (4) through valves (26), (25), and (24); The water source heat pump (7) has an m inlet, an n outlet, an o outlet, and a p inlet. The n outlet pipeline of the water source heat pump (7) is connected to the primary air preheater (4) through valves (26), (25), and (24). The p inlet of the water source heat pump (7) is connected to the outlet of the heating water tank (9). The o outlet of the water source heat pump (7) is connected to the heating load through a valve (29); The lithium bromide absorption chiller (10) has an a inlet, a b outlet, a c inlet, a d outlet, an e inlet, and an f outlet. The b outlet pipeline of the lithium bromide absorption chiller (10) is connected to the constant temperature water tank (3) through a valve (23). The c inlet of the lithium bromide absorption chiller (10) is connected to the outlet of the chilled water supply tank (13). The d outlet of the lithium bromide absorption chiller (10) is connected to a cooling load (12). The cooling load (12) is connected to the inlet of the chilled water supply tank (13). The e inlet and f outlet of the lithium bromide absorption chiller (10) are connected to the cooling tower (11); The air inlet pipeline is connected to the air inlet of the primary air preheater (4). The air outlet of the primary air preheater (4) is connected to the air inlet of the secondary air preheater (5). The air outlet of the secondary air preheater (5) is connected to the drying process flow. The secondary air preheater (5) also has a flue gas inlet and a flue gas outlet.

2. A power supply method for a photovoltaic-thermal integrated power supply system applicable to an industrial park building cluster according to claim 1, characterized in that, after the PV / T module (1) receives irradiation, it generates electricity and heat. When the irradiation is sufficient, the hot water outlet from the PV / T module (1) is directly used as the domestic hot water in the park. The return water with a certain temperature exchanges heat with the air entering the drying system through the primary air preheater (4) of the drying system, and then flows back to the hot water storage tank (2). Then, it is driven by a variable-frequency water pump and enters the PV / T module (1) to complete the heat exchange cycle. When the irradiation is insufficient, the waste heat of the gas plant exhaust is used as a heat source for auxiliary heating to provide heat sources for domestic hot water and building cooling and heating loads; the cooling load is provided by a lithium bromide absorption chiller (10), and the heat source of the lithium bromide absorption chiller (10) is supplemented by flue gas; the industrial heat load of the drying process pipeline is provided by the return water of the hot water storage tank (2) that has completed the heat exchange of the building load and the heat exchange of the flue gas. The air in the drying system is driven by a fan and first passes through the primary air preheater (4) to exchange heat with the return water of the hot water storage tank (2) to recover the heat of the low-temperature hot water after building heating / cooling, and then passes through the secondary air preheater (5) to exchange heat with the flue gas. The flue gas flow is determined according to the outlet air temperature of the secondary air preheater (5). If the heated air still does not meet the temperature requirement, the heater (6) is used to complete the auxiliary heating, and finally it is used to meet the drying process of the drying process pipeline.

3. A control method for a photovoltaic-thermal integrated power supply system applicable to an industrial park building cluster according to claim 1, characterized in that, when the system enters the heating mode, the industrial area adopts three load-side control strategies, which are specifically described as follows: Control strategy one: When the temperature T1 of the constant temperature water tank (3) is greater than or equal to 70 °C, this is the direct supply mode of the PV / T system, and the flue gas waste heat recovery system is not put into operation; Control strategy two: When the temperature T2 of the heating water heated by the flue gas waste heat is greater than or equal to 40 °C, the flue gas waste heat recovery system is put into operation, and the PV / T system and the flue gas waste heat recovery system are connected in series as the heat source for building heating; Control strategy three: When the temperature T2 of the heating water heated by the flue gas waste heat is lower than 40 °C, auxiliary heating equipment is required.

4. According to the control method described in claim 3, characterized in that, when the system enters the cooling mode, the industrial area adopts three load-side control strategies, which are specifically described as follows: Control strategy one: When the temperature T1 of the constant temperature water tank (3) is greater than or equal to 85 °C, the PV / T system is directly used as the heat source of the single-effect absorption lithium bromide chiller; Control strategy two: When the temperature T1 of the constant temperature water tank (3) is less than 85 °C, the PV / T system and the flue gas waste heat recovery system are connected in series as the heat source of the single-effect absorption lithium bromide chiller; Control Strategy Three: When the temperature T2 of the heating water heated by the waste heat of the flue gas is less than 70°C, direct electric air-conditioning refrigeration is adopted.

5. According to the control method described in claim 4, it is characterized in that the operation control of the heat source side of the system characterizes the heat load demand according to the liquid level of the constant temperature water tank (3), and divides the control strategy of the heat source side into two control modes: heat priority and electricity priority. Heat Priority: When the liquid level of the constant temperature water tank (3) is low, the speed of the cooling circulation pump of the PV / T module (1) is reduced. In the heating condition, if the heat generated by the PV / T module (1) is still difficult to meet the heat load requirement, the target value of the inlet water temperature of the constant temperature water tank (3) is further reduced, the valve position of the regulating valve in front of the constant temperature water tank (3) is adjusted, and water with a slightly lower temperature is introduced into the constant temperature water tank (3), and then the temperature is adjusted by the water source heat pump (7). By sacrificing the power of the water source heat pump (7), the heat load demand is ensured to be met. In the refrigeration condition, if the heat generated by the PV / T module (1) is still difficult to meet the need of absorption refrigeration, in order to ensure the safe and stable operation of the absorption refrigeration equipment, the regulating valve in front of the constant temperature water tank (3) is not further adjusted. Electricity Priority: When the liquid level of the constant temperature water tank (3) is high, the target temperature of the cooling water at the outlet of the PV / T module (1) is reduced, the speed of the cooling circulation pump of the PV / T module (1) is increased. At the same time, the constant temperature water tank (3) will stop entering hot water, and the PV / T cooling water directly returns to the hot water storage tank (2) after cooling the module, that is, the valve position of the regulating valve in front of the constant temperature water tank (3) is adjusted.

Images