Solar photovoltaic photo-thermal system

Abstract

The utility model relates to the technical field of comprehensive utilization of solar energy, in particular to a solar photovoltaic photo-thermal system, which comprises a photovoltaic power generation subsystem and a photo-thermal refrigeration, heating and power generation subsystem, and the photo-thermal refrigeration, heating and power generation subsystem is composed of a solar trough type heat collector, a heat exchanger and a lithium bromide absorption type refrigerator. An oil discharge outlet of the solar trough type heat collector is communicated with a shell side inlet of the heat exchanger, a pipe side outlet of the heat exchanger is communicated with a heat source inlet of a generator in the lithium bromide absorption type refrigerator, and a refrigerant outlet of an evaporator in the lithium bromide absorption type refrigerator is communicated to a load side through a refrigerant conveying pipeline. According to the utility model, the photovoltaic power generation subsystem and the photo-thermal refrigeration heating power generation subsystem are integrated, so that the electric heating and refrigeration requirements in remote areas or severe environments can be effectively met, and the comprehensive utilization efficiency of solar energy is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of solar comprehensive utilization, and particularly relates to a solar photovoltaic photo-thermal system. BACKGROUND

[0002] With the continuous advancement of energy technology in China, energy production mode and energy consumption concept have undergone profound changes. Under this background, comprehensive energy services have emerged and gradually become an indispensable backbone force in the future energy society.

[0003] In northwest and other regions, because of the concentration of agricultural irrigation electricity and the high load of winter heating electricity, a large amount of electricity is needed, and the power supply infrastructure is weak. Due to the lack of water resources, the source of electricity is mainly wind and solar power. Therefore, how to use solar heat to realize electric-cold-heat comprehensive energy service is a technical problem to be solved. UTILITARY MODEL

[0004] The utility model aims at providing a solar photovoltaic photo-thermal system, which integrates photovoltaic power generation system and photo-thermal refrigeration and heating power generation system, helps efficient utilization of solar energy and realization of clean power supply, heating and refrigeration, so as to solve the technical problem of how to use solar heat to realize electric-cold-heat comprehensive energy service.

[0005] The embodiment of the utility model realizes the following technical scheme: a solar photovoltaic photo-thermal system, comprising a photovoltaic power generation system and a photo-thermal refrigeration and heating power generation system, the photovoltaic power generation system is configured to convert solar radiation energy into electric power and then output electricity, and the photo-thermal refrigeration and heating power generation system is configured to convert solar radiation energy into heat and then output cold, heat and electricity.

[0006] The photo-thermal refrigeration and heating power generation system is composed of a solar trough collector, a heat exchanger and a lithium bromide absorption refrigeration machine, the oil outlet of the solar trough collector is in communication with the shell side inlet of the heat exchanger, the tube side outlet of the heat exchanger is in communication with the heat source inlet of the generator in the lithium bromide absorption refrigeration machine, and the refrigerant outlet of the evaporator in the lithium bromide absorption refrigeration machine is connected to the load side through a refrigerant conveying pipeline.

[0007] According to a preferred embodiment, the shell side outlet of the heat exchanger is in communication with the oil inlet of the solar trough collector, and the heat source outlet of the generator in the lithium bromide absorption refrigeration machine is in communication with the tube side inlet of the heat exchanger.

[0008] According to a preferred embodiment, the photo-thermal refrigeration heating electron system further comprises a heat accumulator, the oil outlet of the solar trough collector is connected to the first oil inlet of the heat accumulator, the first oil outlet of the heat accumulator is connected to the shell side inlet of the heat exchanger, the shell side outlet of the heat exchanger is connected to the second oil inlet of the heat accumulator, and the second oil outlet of the heat accumulator is connected to the oil inlet of the solar trough collector.

[0009] According to a preferred embodiment, the photo-thermal refrigeration heating electron system further comprises a steam collecting box, the tube side outlet of the heat exchanger is connected to the steam inlet of the steam collecting box, and the first steam outlet of the steam collecting box is connected to the generator heat source inlet of the lithium bromide absorption refrigeration machine.

[0010] According to a preferred embodiment, the lithium bromide absorption refrigeration machine is composed of a generator, a condenser, an evaporator, an absorber and a heat exchanger.

[0011] The first steam outlet of the steam collecting box is connected to the heat source inlet of the generator, the steam outlet of the generator is connected to the steam inlet of the condenser, the liquid working medium outlet of the condenser is connected to the liquid working medium inlet of the evaporator through a working medium conveying pipeline, the liquid working medium outlet of the evaporator is connected to the steam inlet of the absorber, the solution outlet of the generator is connected to the tube side inlet of the heat exchanger, the tube side outlet of the heat exchanger is connected to the solution inlet of the absorber, the solution outlet of the absorber is connected to the shell side inlet of the heat exchanger through a solution conveying pipeline, a solution pump is arranged on the solution conveying pipeline, and the shell side outlet of the heat exchanger is connected to the solution inlet of the generator.

[0012] According to a preferred embodiment, a throttling valve is arranged on the working medium conveying pipeline.

[0013] According to a preferred embodiment, the photo-thermal refrigeration heating electron system further comprises a heat storage water tank, the second steam outlet of the steam collecting box is connected to the steam inlet of the heat storage water tank, and the first water outlet of the heat storage water tank is connected to the load side through a heat medium conveying pipeline.

[0014] According to a preferred embodiment, the photo-thermal refrigeration heating electron system further comprises an air source heat pump, the user side return water pipeline is connected to the water inlet of the air source heat pump, and the water outlet of the air source heat pump is connected to the water inlet of the heat storage water tank.

[0015] According to a preferred embodiment, the photo-thermal refrigeration heating electron system further comprises a steam turbine unit, the steam turbine unit is composed of a gas cylinder and a generator, the third steam outlet of the steam collecting box is connected to the steam inlet of the gas cylinder, the gas cylinder is coaxially arranged with the generator, and the output end of the generator is connected to the load side.

[0016] According to a preferred embodiment, the photovoltaic power generation system is composed of a solar photovoltaic panel, an inverter, a grid-connected cabinet and a transformer, the output end of the solar photovoltaic panel is electrically connected with the input end of the inverter, the output end of the inverter is electrically connected with the input end of the grid-connected cabinet, the output end of the grid-connected cabinet is electrically connected with the input end of the transformer, the first output end of the transformer is connected to a load side, and the second output end of the transformer is connected to a public power grid.

[0017] The solar photovoltaic light heat system has at least the following advantages and beneficial effects: the solar photovoltaic light heat system can effectively solve the electricity heating and refrigeration demand in remote areas or in harsh environments, improve the comprehensive utilization efficiency of solar energy, and the comprehensive photovoltaic power generation system adopts a self-generation and self-use mode and a surplus electricity grid-connected mode, and the surplus electricity can be sold to the power grid, so that the demand of users for high-quality electricity, low-quality heat and low-quality cold and the purpose of comprehensive energy multi-energy complementary integration are met. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A structure schematic view of the solar photovoltaic light heat system provided in the embodiment 1 of the utility model is provided.

[0019] Figure 2 A structure schematic view of the lithium bromide absorption refrigerating machine provided in the embodiment 1 of the utility model is provided.

[0020] Figure legend: 1-solar photovoltaic panel, 2-inverter, 3-grid-connected cabinet, 4-transformer, 5-public power grid, 6-local load, 7-solar trough collector, 8-heat accumulator, 9-heat exchanger, 10-steam collector, 11-lithium bromide absorption refrigerating machine, 12-heat storage water tank, 13-air source heat pump, 14-heat conducting oil circulation loop, 15-water vapor circulation loop, 16-generator, 17-condenser, 18-throttle valve, 19-evaporator, 20-absorber, 21-solution pump, 22-heat exchanger. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Embodiment 1

[0023] The embodiment provides a solar photovoltaic light heat system, referring to Figure 1As shown, the solar photovoltaic photo-thermal system integrates a photovoltaic power generation system and a photo-thermal refrigeration and heating power generation system; wherein the photovoltaic power generation system is configured to convert solar radiation energy into electric power and then output electricity, and the photo-thermal refrigeration and heating power generation system is configured to convert solar radiation energy into heat and then output cold, heat and electricity.

[0024] Regarding the solar photovoltaic photo-thermal system, in the present embodiment, a self-generating automatic and excess electricity grid-connected mode is adopted, and the specific structure is as follows: the photovoltaic power generation system is composed of a solar photovoltaic panel 1, an inverter 2, a grid-connected cabinet 3 and a transformer 4, the output end of the solar photovoltaic panel 1 is electrically connected with the input end of the inverter 2, the solar photovoltaic panel 1 is used to convert solar radiation energy into direct current and output to the inverter 2; the output end of the inverter 2 is electrically connected with the input end of the grid-connected cabinet 3, the inverter 2 is used to convert the direct current input by the solar photovoltaic panel 1 into alternating current and send it into the grid-connected cabinet 3; the output end of the grid-connected cabinet 3 is electrically connected with the input end of the transformer 4, the first output end of the transformer 4 is connected to the load side, the transformer 4 is used to transform the input alternating current, and the transformed electric power is supplied to the local load 6 for residents to use; the second output end of the transformer 4 is connected to the public power grid 5, and the unabsorbed electric power is connected to the public power grid 5 for sale.

[0025] Regarding the photo-thermal refrigeration and heating power generation system, in the present embodiment, a solar trough collector 7 is used to supply heat to a lithium bromide absorption refrigeration machine 11 to generate refrigeration, supply heat to a heat storage water tank 12 to supply hot water, and supply heat to a steam turbine unit to generate electricity, and the specific structure is as follows:

[0026] The photo-thermal refrigeration and heating power generation system is composed of a solar trough collector 7, a heat exchanger 9 and a lithium bromide absorption refrigeration machine 11; the oil outlet of the solar trough collector 7 is in communication with the shell side inlet of the heat exchanger 9, the shell side outlet of the heat exchanger 9 is in communication with the oil inlet of the solar trough collector 7 through a heat conducting oil circulation loop 14, the high temperature heat conducting oil of the solar trough collector 7 enters the heat exchanger 9 to release heat, and the heat released heat conducting oil returns to the solar collector through the heat conducting oil circulation loop 14, forming a closed circulation loop; the tube side outlet of the heat exchanger 9 is in communication with the heat source inlet of the generator 16 in the lithium bromide absorption refrigeration machine 11, and on the tube side of the heat exchanger 9, the refrigerant is converted into high temperature and high pressure steam through the heat release of the high temperature heat conducting oil, and the high temperature and high pressure steam is used as the heat source of the generator 16 in the lithium bromide absorption refrigeration machine 11; the heat source outlet of the generator 16 in the lithium bromide absorption refrigeration machine 11 is in communication with the tube side inlet of the heat exchanger 9 through a water vapor circulation loop 15, and the refrigerant is heated through the heat exchanger 9.

[0027] Specific to the embodiment, the heat storage tank 8 is configured for the solar trough collector 7 to store the heat of the heat transfer oil; the oil outlet of the solar trough collector 7 is in communication with the first oil inlet of the heat storage tank 8, the first oil outlet of the heat storage tank 8 is in communication with the shell side inlet of the heat exchanger 9, the shell side outlet of the heat exchanger 9 is in communication with the second oil inlet of the heat storage tank 8, and the second oil outlet of the heat storage tank 8 is in communication with the oil inlet of the solar trough collector 7.

[0028] Further, the steam collecting tank 10 is configured for the heat exchanger 9 to distribute the high-temperature and high-pressure steam; the tube side outlet of the heat exchanger 9 is in communication with the steam inlet of the steam collecting tank 10, and the first steam outlet of the steam collecting tank 10 is in communication with the heat source inlet of the generator 16 of the lithium bromide absorption refrigerator 11.

[0029] Regarding the refrigeration part, in the embodiment, as shown in Figure 2 the lithium bromide absorption refrigerator 11 is composed of the generator 16, the condenser 17, the evaporator 19, the absorber 20, and the heat exchanger 22, and the refrigerant outlet of the evaporator 19 is connected to the load side through a refrigerant conveying pipeline.

[0030] Regarding the structure of the lithium bromide absorption refrigerator 11, the first steam outlet of the steam collecting tank 10 is in communication with the heat source inlet of the generator 16, the steam outlet of the generator 16 is in communication with the steam inlet of the condenser 17, the liquid working medium outlet of the condenser 17 is connected to the liquid working medium inlet of the evaporator 19 through a working medium conveying pipeline, a throttling valve 18 is arranged on the working medium conveying pipeline, the liquid working medium outlet of the evaporator 19 is in communication with the steam inlet of the absorber 20, the solution outlet of the generator 16 is in communication with the tube side inlet of the heat exchanger 22, the tube side outlet of the heat exchanger 22 is in communication with the solution inlet of the absorber 20, the solution outlet of the absorber 20 is connected to the shell side inlet of the heat exchanger 22 through a solution conveying pipeline, a solution pump 21 is arranged on the solution conveying pipeline, and the shell side outlet of the heat exchanger 22 is in communication with the solution inlet of the generator 16.

[0031] The principle of the lithium bromide absorption refrigerator 11 is described as follows: the steam collecting tank 10 distributes the high-temperature and high-pressure steam to the generator 16 to heat the lithium bromide aqueous solution on the tube side of the generator 16, the lithium bromide aqueous solution absorbs heat, and the refrigerant therein vaporizes into high-temperature and high-pressure water vapor to enter the condenser 17, while the concentration of the lithium bromide aqueous solution increases to become a concentrated solution, which enters the absorber 20 through the tube side of the heat exchanger 22.

[0032] The high-temperature and high-pressure water vapor entering the condenser 17 is condensed into low-temperature and high-pressure liquid water, and the low-temperature and high-pressure liquid water is throttled and decompressed by the throttling valve 18 and then enters the evaporator 19 to rapidly expand and vaporize, in the process of vaporization, a large amount of heat of the coolant water on the shell side of the evaporator 19 is absorbed, low-temperature and low-pressure steam is generated, and the cooling of the coolant water is realized; the low-temperature and low-pressure steam enters the absorber 20 to change the concentrated solution in the absorber 20 into a dilute solution, and the dilute solution is sent back to the generator 16 by the solution pump 21 after being heated by the shell side of the heat exchanger 22, so that the temperature of the dilute solution entering the generator 16 is increased, thereby saving the heat for heating the dilute solution and improving the thermal efficiency of the whole device. As for the heating part, in the embodiment, the photo-thermal refrigeration and heating power generation system further comprises a heat storage water tank 12 and an air source heat pump 13, the second exhaust port of the steam collecting tank 10 is in communication with the steam inlet of the heat storage water tank 12, and the high-temperature and high-pressure water vapor is used to heat the heat storage water tank 12, the first water outlet of the heat storage water tank 12 is connected to the load side through a heat medium conveying pipeline, and hot water is supplied to local users; it should be noted that when the solar radiation energy of the photo-thermal refrigeration and heating power generation system is sufficient, the excess heat energy can be stored in the heat storage water tank 12 by the steam collecting tank 10. The user side water return pipeline is in communication with the water inlet of the air source heat pump 13, and the water outlet of the air source heat pump 13 is in communication with the water inlet of the heat storage water tank 12, and is used to store the hot water produced by the air source heat pump 13.

[0033] As for the power generation part, in the embodiment, the photo-thermal refrigeration and heating power generation system further comprises a steam turbine unit, the steam turbine unit is composed of a gas cylinder and a power generator, the third steam outlet of the steam collecting tank 10 is in communication with the steam inlet of the gas cylinder, the gas cylinder is coaxially arranged with the power generator, and the output end of the power generator is connected to the load side.

[0034] In summary, the solar photovoltaic and photo-thermal system provided by the utility model can effectively solve the demand for electricity, heating and refrigeration in remote areas or harsh environments, improve the comprehensive utilization efficiency of solar energy, and the comprehensive photovoltaic power generation system adopts a self-generation and self-use mode and a surplus electricity grid-connected mode, and the excess electricity can also be sold to the power grid, so that the demand of users for high-quality electricity, low-quality heat and low-quality cold can be met, and the purpose of comprehensive energy multi-energy complementary integration is achieved.

[0035] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and the utility model can have various changes and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A solar photovoltaic and photo-thermal system, characterized in that, The photovoltaic power generation system is configured to convert solar radiation energy into electric power and then output electricity, and the photothermal refrigeration and heating power generation system is configured to convert solar radiation energy into heat and then output cold, heat and electricity. The photothermal refrigeration and heating power generation system is composed of a solar trough collector (7), a heat exchanger (9) and a lithium bromide absorption refrigerator (11), the oil outlet of the solar trough collector (7) is in communication with the shell side inlet of the heat exchanger (9), the tube side outlet of the heat exchanger (9) is in communication with the heat source inlet of the generator (16) of the lithium bromide absorption refrigerator (11), and the refrigerant outlet of the evaporator (19) of the lithium bromide absorption refrigerator (11) is connected to the load side through a refrigerant conveying pipeline.

2. The solar photovoltaic and photothermal system of claim 1, wherein, The shell side outlet of the heat exchanger (9) is in communication with the oil inlet of the solar trough collector (7), and the heat source outlet of the generator (16) of the lithium bromide absorption refrigerator (11) is in communication with the tube side inlet of the heat exchanger (9).

3. The solar photovoltaic and photothermal system of claim 1, wherein, The photothermal refrigeration and heating power generation system further comprises a heat accumulator (8), the oil outlet of the solar trough collector (7) is in communication with the first oil inlet of the heat accumulator (8), the first oil outlet of the heat accumulator (8) is in communication with the shell side inlet of the heat exchanger (9), the shell side outlet of the heat exchanger (9) is in communication with the second oil inlet of the heat accumulator (8), and the second oil outlet of the heat accumulator (8) is in communication with the oil inlet of the solar trough collector (7).

4. The solar photovoltaic and photothermal system of claim 1, wherein, The photothermal refrigeration and heating power generation system further comprises a steam collecting tank (10), the tube side outlet of the heat exchanger (9) is in communication with the steam inlet of the steam collecting tank (10), and the first steam outlet of the steam collecting tank (10) is in communication with the heat source inlet of the generator (16) of the lithium bromide absorption refrigerator (11).

5. The solar photovoltaic and photothermal system of claim 4, wherein, The lithium bromide absorption refrigerator (11) is composed of a generator (16), a condenser (17), an evaporator (19), an absorber (20) and a heat exchanger (22). The first steam outlet of the steam collecting tank (10) is in communication with the heat source inlet of the generator (16), the steam outlet of the generator (16) is in communication with the steam inlet of the condenser (17), the liquid working medium outlet of the condenser (17) is connected to the liquid working medium inlet of the evaporator (19) through a working medium conveying pipeline, the liquid working medium outlet of the evaporator (19) is in communication with the steam inlet of the absorber (20), the solution outlet of the generator (16) is in communication with the tube side inlet of the heat exchanger (22), the tube side outlet of the heat exchanger (22) is in communication with the solution inlet of the absorber (20), the solution outlet of the absorber (20) is connected to the shell side inlet of the heat exchanger (22) through a solution conveying pipeline, a solution pump (21) is arranged on the solution conveying pipeline, and the shell side outlet of the heat exchanger (22) is in communication with the solution inlet of the generator (16).

6. The solar photovoltaic and photothermal system of claim 5, wherein, A throttling valve (18) is arranged on the working medium conveying pipeline.

7. The solar photovoltaic and photothermal system of claim 4, wherein, The photo-thermal refrigeration heating power generation system further comprises a heat storage water tank (12), a second exhaust port of the collecting tank (10) is communicated with an inlet port of the heat storage water tank (12), and a first water outlet port of the heat storage water tank (12) is communicated with a load side through a heat medium conveying pipeline.

8. The solar photovoltaic and photothermal system of claim 7, wherein, The photo-thermal refrigeration heating power generation system further comprises an air source heat pump (13), a user side return water pipeline is communicated with an inlet port of the air source heat pump (13), and a water outlet port of the air source heat pump (13) is communicated with an inlet port of the heat storage water tank (12).

9. The solar photovoltaic and photo-thermal system of claim 4, wherein, The photo-thermal refrigeration heating power generation system further comprises a steam turbine unit, the steam turbine unit is composed of a gas cylinder and a generator, a third exhaust port of the collecting tank (10) is communicated with an inlet port of the gas cylinder, the gas cylinder is coaxially arranged with the generator, and an output end of the generator is connected to the load side.

10. The solar photovoltaic and photo thermal system according to any of claims 1 to 9, characterized in that, The photo-thermal refrigeration heating power generation system further comprises a solar photovoltaic panel (1), an inverter (2), a grid-connected cabinet (3) and a transformer (4), an output end of the solar photovoltaic panel (1) is electrically connected with an input end of the inverter (2), an output end of the inverter (2) is electrically connected with an input end of the grid-connected cabinet (3), an output end of the grid-connected cabinet (3) is electrically connected with an input end of the transformer (4), a first output end of the transformer (4) is connected to the load side, and a second output end of the transformer (4) is connected to a public power grid (5).

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