Solar thermal power generation and heat pump waste heat comprehensive utilization system

Abstract

The present application relates to the technical field of multi-energy complementary energy utilization, and in particular to a solar thermal power generation and heat pump waste heat comprehensive utilization system. Power plants that use low-temperature waste heat for heating rely solely on low-temperature waste heat for heating. When the demand for heating is large, the low-temperature waste heat of the power plant boiler is not enough to meet this demand. The solar thermal power generation and heat pump waste heat comprehensive utilization system of the present application includes a condensation heat exchange subsystem, a solar thermal heat exchange subsystem and a heating network; on the one hand, it heats the heating network by utilizing solar heat, and on the other hand, it receives the heat released by the condensation of the exhaust steam of the steam turbine of the power plant boiler, and transports the energy in the hot steam to the heating network through a heat pump, thereby realizing the coordinated utilization of two clean energy sources, saving resources, being environmentally friendly, and meeting people's heating needs at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of multi-energy complementary energy utilization, and in particular to a solar thermal power generation and heat pump waste heat comprehensive utilization system. Background Art

[0002] In recent years, due to industrial development, conventional energy such as fossil energy needs to be burned. The combustion of fossil energy produces a large amount of harmful substances such as soot and oxides, causing very serious environmental pollution, which has attracted widespread attention.

[0003] As the reserves of fossil energy gradually decrease, how to improve the efficiency of energy utilization has become the focus of attention in the industry. Especially in the field of power plants, thermal power generation produces a large amount of waste water and waste gas and other low-temperature waste heat that has not been effectively utilized. Some steel companies need to start high-energy-consuming and low-efficiency coal-fired small boilers or directly consume high-quality steam for heating in winter. Due to the difference in gas consumption in winter and summer, steam supply is difficult and even affects industrial production. Therefore, how to use low-temperature waste heat more efficiently without affecting industrial production has become a technical problem that needs to be solved in the industry.

[0004] Power plants that use low-temperature waste heat for heating have improved the thermal load utilization rate of power plants, reduced coal consumption, saved water, and improved the economic efficiency of power plant operations, while also achieving better economic and social benefits. However, if we rely solely on low-temperature waste heat for heating, when the demand for heating is large, the low-temperature waste heat from power plant boilers is not enough to meet this demand, and we need to find an energy supply method to fill the heating gap. Summary of the invention

[0005] The present application provides a solar thermal power generation and heat pump waste heat comprehensive utilization system to solve the problem that current clean energy cannot fully meet the heating demand.

[0006] The technical solutions adopted in this application are as follows:

[0007] A solar thermal power generation and heat pump waste heat comprehensive utilization system, comprising a condensation heat exchange subsystem, a solar thermal heat exchange subsystem and a heating pipe network;

[0008] The condensation heat exchange subsystem is connected to the heating network via a heat pump, and the light-heat heat exchange subsystem is connected to the heating network via a heat exchanger;

[0009] The condensation heat exchange subsystem includes a condenser and a condensation heat supply network. The condenser is arranged in the condensation heat supply network. The circulating cooling water in the condenser absorbs the latent heat of the exhaust steam of the steam turbine and flows into the heat pump. The water in the heat supply network is heated by the heat pump. The condensation heat supply network is connected to a cooling tower. The condensation heat exchange system is used to cool the exhaust steam of the steam turbine and reduce the cold source loss of the unit.

[0010] The photothermal heat exchange subsystem includes a photothermal collector and a photothermal heating network. The photothermal collector is used to conduct light heat to a heating medium, and then transport the heating medium to the photothermal heating network.

[0011] Optionally, an ORC power generation subsystem is also included, which is connected to the solar thermal heating network through a heat exchanger. The ORC power generation subsystem includes an ORC working fluid network, an ORC device and a generator. The ORC device absorbs the energy of the solar thermal heating network through the working fluid in the ORC working fluid network to generate electricity for the generator.

[0012] Optionally, it also includes a driving heat source subsystem, which leads out a driving pipeline network from the solar thermal heating pipeline network, and the driving pipeline network passes through the heat pump along the flow direction of the heating medium and then refluxes to connect to the solar thermal collector.

[0013] Optionally, a water pump is also included, and the water pump is arranged in the solar thermal heating network and the heating network.

[0014] Optionally, a water valve is also included, and the water valve is arranged in the solar thermal heating network.

[0015] Optionally, a water replenishment pump is also included, and the water replenishment pump is arranged in the solar thermal heating network.

[0016] Optionally, it also includes a sub-level heating pipe network, which is connected to the heating pipe network through a sub-level heat exchange station.

[0017] Optionally, a heater is also included, and the heater is arranged in the heating pipe network.

[0018] The beneficial effects of adopting the technical solution of this application are as follows:

[0019] The solar thermal power generation and heat pump waste heat comprehensive utilization system of the present application includes a condensing heat exchange subsystem, a solar thermal heat exchange subsystem and a heating network; on the one hand, the heating network is heated by utilizing solar heat, and on the other hand, the hot steam exhausted by the steam turbine of the power plant boiler is received, and the energy in the hot steam is transported to the heating network through the heat pump, thereby realizing the coordinated utilization of two clean energy sources, saving resources, being friendly to the environment, and meeting people's heating needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1This is a schematic diagram of the structure of an embodiment of the present application;

[0022] Figure 2 This is a structural schematic diagram of another embodiment of the present application;

[0023] Illustration Description:

[0024] Among them, 1- condensation heat exchange subsystem, 11- condenser, 12- condensation heating network, 2- photothermal heat exchange subsystem, 21- photothermal collector, 22- photothermal heating network, 3- heating network, 4- heat exchanger, 5- heat pump, 6- driving heat source subsystem, 7- ORC power generation subsystem, 8- sub-level heating network. DETAILED DESCRIPTION

[0025] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0026] See also Figure 1 , which is a structural diagram of an embodiment of the present application.

[0027] The present application provides a solar thermal power generation and heat pump waste heat comprehensive utilization system, comprising a condensation heat exchange subsystem 1, a solar thermal heat exchange subsystem 2 and a heating pipe network 3;

[0028] The condensation heat exchange subsystem 1 is connected to the heating network 3 via a heat pump 5, and the light-heat heat exchange subsystem 2 is connected to the heating network 3 via a heat exchanger 4;

[0029] The condensation heat exchange subsystem 1 includes a condenser 11 and a condensation heat supply network 12. The condenser 11 is arranged in the condensation heat supply network 12. The circulating cooling water in the condenser 11 absorbs the latent heat of the exhaust steam of the steam turbine and flows into the heat pump 5. The water in the heat supply network 3 is heated by the heat pump 5. The condensation heat supply network 12 is connected to the cooling tower. The condensation heat exchange system is used to cool the exhaust steam of the steam turbine and reduce the cold source loss of the unit.

[0030] The photothermal heat exchange subsystem 2 includes a photothermal collector 21 and a photothermal heating network 22 . The photothermal collector 21 is used to transfer light heat to a heating medium, and then transport the heating medium to the photothermal heating network 22 .

[0031] In this embodiment, the condensing heat exchange subsystem 1 is used to collect steam energy discharged by the steam turbine. Since the steam itself contains a part of energy, this part of energy is usually lost and not recycled. In this embodiment, by recycling this part of steam, the energy is transported to the heating network 3 through the heat pump 5, which is conducive to energy conservation, environmental protection and cleanliness, and meets the energy demand of part of the heating network 3. In addition, the solar thermal collector 21 absorbs the energy of sunlight, and transports this energy to the solar thermal heating network 22 through the heating medium, and then transfers the energy to the heating network 3 through the heat exchanger 4.

[0032] Optionally, an ORC power generation subsystem 7 is also included, and the ORC power generation subsystem 7 is connected to the photothermal heating network 22 through a heat exchanger 4. The ORC power generation subsystem 7 includes an ORC working fluid network, an ORC device and a generator. The ORC device absorbs the energy of the photothermal heating network 22 through the working fluid in the ORC working fluid network to generate electricity for the generator.

[0033] Combined with Figure 2 , is a structural diagram of another embodiment of the present application. In this embodiment, in order to utilize solar thermal energy more efficiently, part of the energy in the solar thermal heating network 22 is diverted to the ORC power generation subsystem 7, and the energy is converted into the operating energy of the generator through the ORC device, and the generator generates electricity to generate electrical energy.

[0034] Optionally, it also includes a driving heat source subsystem 6, which leads out a driving pipeline from the solar thermal heating pipeline 22, and the driving pipeline passes through the heat pump 5 along the flow direction of the heating medium and then flows back to the solar thermal collector 21.

[0035] Combined with Figure 2 In this embodiment, the driving heat source subsystem 6 is used to drive the heat pump 5 to operate. After the heat pump 5 absorbs the energy of the driving heat source subsystem 6, it enters a normal working state and transmits the energy of the condensing heat exchange subsystem 1 to the heating network 3.

[0036] Optionally, a water pump is also included, which is arranged in the solar thermal heating network 22 and the heating network 3.

[0037] The setting of the water pump is conducive to the circulation of water in the solar thermal heating network 22 and the heating network 3 with a certain pressure and flow rate, which is convenient for adjusting the heating level.

[0038] Optionally, a water valve is also included, and the water valve is arranged in the solar thermal heating network 22.

[0039] Optionally, a water replenishment pump is also included, and the water replenishment pump is arranged in the solar thermal heating network 22.

[0040] Optionally, a sub-stage heating network 8 is also included, and the sub-stage heating network 8 is connected to the heating network 3 through a sub-stage heat exchange station.

[0041] Optionally, a heater is further included, and the heater is arranged in the heating pipe network 3.

[0042] The solar thermal power generation and heat pump waste heat comprehensive utilization system of the present application includes a condensing heat exchange subsystem 1, a solar thermal heat exchange subsystem 2 and a heating network 3; on the one hand, the heating network 3 is heated by utilizing solar heat, and on the other hand, the heat released by the exhaust steam of the steam turbine of the power plant boiler is received, and the energy in the hot steam is transported to the heating network 3 through the heat pump 5, thereby realizing the coordinated utilization of two clean energy sources, saving resources, being friendly to the environment, and meeting people's heating needs.

[0043] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A solar thermal power generation and heat pump waste heat comprehensive utilization system, characterized in that: It includes condensation heat exchange subsystem, photothermal heat exchange subsystem and heating pipe network; The condensation heat exchange subsystem is connected to the heating network via a heat pump, and the light-heat heat exchange subsystem is connected to the heating network via a heat exchanger; The condensation heat exchange subsystem includes a condenser and a condensation heat supply network. The condenser is arranged in the condensation heat supply network. The circulating cooling water in the condenser absorbs the latent heat of the exhaust steam of the steam turbine and flows into the heat pump. The water in the heat supply network is heated by the heat pump. The condensation heat supply network is connected to the cooling tower. The condensation heat exchange subsystem is used to cool the exhaust steam of the steam turbine and reduce the cold source loss of the unit. The photothermal heat exchange subsystem includes a photothermal collector and a photothermal heating network. The photothermal collector is used to transfer light heat to a heating medium, and then transport the heating medium to the photothermal heating network. It also includes an ORC power generation subsystem, which is connected to the photothermal heating network through a heat exchanger, and the ORC power generation subsystem includes an ORC working fluid network, an ORC device and a generator, and the ORC device absorbs the energy of the photothermal heating network through the working fluid in the ORC working fluid network to generate electricity for the generator; It also includes a driving heat source subsystem, which leads out a driving pipeline network from the photothermal heating pipeline network. The driving pipeline network passes through the heat pump along the flow direction of the heating medium and then flows back to the photothermal collector.

2. The solar thermal power generation and heat pump waste heat comprehensive utilization system according to claim 1 is characterized in that: It also includes a water pump, which is arranged in the photothermal heating network and the heating network.

3. The solar thermal power generation and heat pump waste heat comprehensive utilization system according to claim 1 is characterized in that: It also includes a water valve, which is arranged in the solar thermal heating network.

4. The solar thermal power generation and heat pump waste heat comprehensive utilization system according to claim 1 is characterized in that: It also includes a water replenishment pump, which is arranged in the solar thermal heating network.

5. The solar thermal power generation and heat pump waste heat comprehensive utilization system according to claim 1 is characterized in that: It also includes a sub-level heating pipe network, which is connected to the heating pipe network through a sub-level heat exchange station.

6. The solar thermal power generation and heat pump waste heat comprehensive utilization system according to claim 1 is characterized in that: It also includes a heater, which is arranged in the heating pipe network.

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