Multi-mode trigeneration energy supply system based on solar photo-thermal driving

Abstract

The invention relates to the technical field of solar heat, in particular to a multi-mode trigeneration energy supply system based on solar photo-thermal driving, comprising a solar heat collection and storage module, a heating module, a power generation module and a refrigeration module, the heating module is connected with the solar heat collection and storage module, the power generation module is connected with the solar heat collection and storage module, and the refrigeration module is connected with the solar heat collection and storage module. By adopting the technologies of solar photo-thermal, heat pump cycle, organic Rankine cycle, compression type refrigeration cycle and the like, poly-generation cycle with solar energy as a driving source is constructed, and by adjusting the distribution of organic working media in the solar heat collection and storage module, the heating module, the power generation module and the refrigeration module, the power generation efficiency is improved. The multi-mode operation of the tri-generation system can effectively provide energy sources in three forms of cold, heat and electricity, reasonable combination of different types of energy sources is achieved, and the available energy loss in the energy supply process is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of solar thermal energy, and particularly to a multi-mode trigeneration energy supply system driven by solar photovoltaic thermal energy. Background Art

[0002] As a renewable energy source with abundant reserves, widespread availability, and cleanliness, the development and utilization of solar energy is an important part of building an efficient, clean, and low-carbon energy system. Improving the utilization efficiency of solar energy resources helps to promote the sustainable development of energy and contribute to the realization of the dual-carbon strategic goal. In recent years, multi-generation technologies driven by solar energy have increasingly attracted the attention of scholars around the world. The multi-generation cycle system can enrich the types of energy products and enhance the energy supply capacity, playing a very positive role in improving energy efficiency, saving resources, and improving the environment.

[0003] In recent years, many scholars at home and abroad have conducted a large number of studies on multi-generation systems, and their multi-mode operation strategies are also one of the research focuses. The multi-mode operation of multi-generation systems has the characteristics of flexible energy supply methods and energy conservation. However, the research mainly focuses on combined heat and power generation or combined cooling and power generation. How to conduct an analysis of multi-mode operation for combined heat, cooling, and power generation systems, improve the comprehensive utilization efficiency of solar energy, and reduce irreversible losses in the process still needs to be further studied. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-mode trigeneration energy supply system driven by solar photovoltaic thermal energy, aiming to solve the problem that the research mainly focuses on combined heat and power generation or combined cooling and power generation, and how to conduct an analysis of multi-mode operation for combined heat, cooling, and power generation systems, improve the comprehensive utilization efficiency of solar energy, and reduce irreversible losses in the process still needs to be further studied.

[0005] To achieve the above purpose, the present invention provides a multi-mode trigeneration energy supply system driven by solar photovoltaic thermal energy, including a solar heat collection and storage module, a heating module, a power generation module, and a refrigeration module. The heating module is connected to the solar heat collection and storage module, the power generation module is connected to the solar heat collection and storage module, and the refrigeration module is connected to the power generation module; The solar heat collection and storage module is used to convert solar energy into heat energy; The heating module is used to supply heat to the user side; The power generation module is used to supply power to the user side; The refrigeration module is used to supply cooling to the user side.

[0006] Among them, the solar heat collection and storage module includes a solar collector, a first three-way valve, a heat-conducting oil heat exchanger, a first mixer, a low-temperature heat storage tank, a high-temperature heat storage tank, a first evaporator, a heat-conducting oil pump, and a second three-way valve. The first three-way valve is connected to the solar collector, the heat-conducting oil heat exchanger is connected to the first three-way valve, the low-temperature heat storage tank is connected to the heat-conducting oil heat exchanger, the high-temperature heat storage tank is connected to the heat-conducting oil heat exchanger, the first evaporator is connected to the first three-way valve, the heat-conducting oil pump is connected to the first evaporator, the first mixer is respectively connected to the heat-conducting oil heat exchanger and the heat-conducting oil pump, and is connected to the solar collector, and the second three-way valve is connected to the first evaporator.

[0007] Among them, the heating module includes a first compressor, a first condenser, a first throttle valve, and a second mixer. The first compressor is connected to the second three-way valve, the first condenser is connected to the first compressor, the first throttle valve is connected to the first condenser, and the second mixer is respectively connected to the first throttle valve and the first evaporator.

[0008] Among them, the power generation module includes an expander, a third mixer, a second condenser, a third three-way valve, and a working fluid pump. The expander is connected to the second three-way valve, the third mixer is connected to the expander, the second condenser is connected to the third mixer, the third three-way valve is connected to the second condenser, and the working fluid pump is respectively connected to the third three-way valve and the second mixer.

[0009] Among them, the refrigeration module includes a second throttle valve, a second evaporator, and a second compressor. The second throttle valve is connected to the third three-way valve, the second evaporator is connected to the second throttle valve, and the second compressor is respectively connected to the second evaporator and the third mixer.

[0010] A multi-mode trigeneration energy supply system based on solar thermal drive of the present invention constructs a multi-generation cycle with solar energy as the driving source by adopting technologies such as solar thermal, heat pump cycle, organic Rankine cycle, compression refrigeration cycle, etc. By adjusting the distribution of organic working fluids in different modules, multi-mode operation of the cycle is realized. Adopting solar thermal technology and combining with energy storage devices can effectively utilize solar energy resources, enhance the sustainability of energy utilization, and effectively improve energy utilization efficiency; in view of problems such as the variable energy demand on the user side, the multi-mode operation of the trigeneration system can effectively provide three forms of energy: cold, heat, and electricity, and realize a reasonable combination between different types of energy, effectively reducing the available energy loss during the energy supply process. Description of the Drawings

[0011] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art.

[0012] Figure 1 It is a schematic structural diagram of a multi-mode trigeneration energy supply system driven by solar thermal energy according to the first embodiment of the present invention.

[0013] Figure 2 It is a schematic structural diagram of the solar heat collection and storage module, heating module, power generation module and refrigeration module according to the first embodiment of the present invention.

[0014] Figure 3 It is a schematic diagram of the multi-mode operation of a multi-mode trigeneration energy supply system driven by solar thermal energy according to the first embodiment of the present invention.

[0015] In the figure: 101 - solar heat collection and storage module, 102 - heating module, 103 - power generation module, 104 - refrigeration module, 105 - solar collector, 106 - first three-way valve, 107 - heat transfer oil heat exchanger, 108 - first mixer, 109 - low-temperature heat storage tank, 110 - high-temperature heat storage tank, 111 - first evaporator, 112 - heat transfer oil pump, 113 - second three-way valve, 114 - first compressor, 115 - first condenser, 116 - first throttle valve, 117 - second mixer, 118 - expander, 119 - third mixer, 120 - second condenser, 121 - third three-way valve, 122 - working fluid pump, 123 - second throttle valve, 124 - second evaporator, 125 - second compressor. Detailed Embodiments

[0016] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0017] The first embodiment of the present application is as follows: Please refer to Figures 1 to 3 where Figure 1 It is a schematic structural diagram of a multi-mode trigeneration energy supply system driven by solar thermal energy according to the first embodiment of the present invention. Figure 2 It is a schematic structural diagram of the solar heat collection and storage module, heating module, power generation module and refrigeration module according to the first embodiment of the present invention. Figure 3 It is a schematic diagram of the multi-mode operation of a multi-mode trigeneration energy supply system driven by solar thermal energy according to the first embodiment of the present invention.

[0018] The present invention provides a multi-mode trigeneration energy supply system based on solar thermal drive, comprising a solar thermal collection and storage module 101, a heating module 102, a power generation module 103 and a refrigeration module 104, wherein the solar thermal collection and storage module 101 comprises a solar collector 105, a first three-way valve 106, a thermal oil heat exchanger 107, a first mixer 108, a low-temperature heat storage tank 109, a high-temperature heat storage tank 110, a first evaporator 111, a thermal oil pump 112 and a second three-way valve 113, the heating module 102 comprises a first compressor 114, a first condenser 115, a first throttle valve 116 and a second mixer 117, the power generation module 103 comprises an expander 118, a third mixer 119, a second condenser 120, a third three-way valve 121 and a working fluid pump 122, and the refrigeration module 104 comprises a second throttle valve 123, a second evaporator 124 and a second compressor 125. The above-mentioned solution solves the problem of how to conduct multi-mode operation analysis for the combined heat, power and cooling system, improve the comprehensive utilization efficiency of solar energy, and reduce irreversible losses in the process. This still needs further research. It can be understood that the above-mentioned solution can be used to improve the comprehensive utilization efficiency of solar energy and reduce irreversible losses in the process.

[0019] In this embodiment, the outlet of the solar collector 105 is communicated with the inlet of the first three-way valve 106. One outlet of the first three-way valve 106 is communicated with the high-temperature side inlet of the heat transfer oil heat exchanger 107. The high-temperature side outlet of the heat transfer oil heat exchanger 107 is communicated with one inlet of the first mixer 108. The low-temperature heat storage tank 109 is communicated with the low-temperature side inlet of the heat transfer oil heat exchanger 107. The low-temperature side outlet of the heat transfer oil heat exchanger 107 is communicated with the high-temperature heat storage tank 110. The other outlet of the first three-way valve 106 is communicated with the high-temperature side inlet of the first evaporator 111. The high-temperature side outlet of the first evaporator 111 is communicated with the inlet of the heat transfer oil pump 112. The outlet of the heat transfer oil pump 112 is communicated with the other inlet of the first mixer 108. The outlet of the first mixer 108 is communicated with the inlet of the solar collector 105. The low-temperature side outlet of the first evaporator 111 is communicated with the inlet of the second three-way valve 113. One outlet of the second three-way valve 113 is communicated with the inlet of the first compressor 114. The outlet of the first compressor 114 is communicated with the high-temperature side inlet of the first condenser 115. The high-temperature side outlet of the first condenser 115 is communicated with the inlet of the first throttle valve 116. The water on the low-temperature side of the first condenser 115 absorbs heat and supplies heat to users. The outlet of the first throttle valve 116 is communicated with one inlet of the second mixer 117. The outlet of the second mixer 117 is communicated with the low-temperature side inlet of the first evaporator 111. The other outlet of the second three-way valve 113 is communicated with the inlet of the expander 118. The outlet of the expander 118 is communicated with one inlet of the third mixer 119. The outlet of the third mixer 119 is communicated with the high-temperature side inlet of the second condenser 120. The high-temperature side outlet of the second condenser 120 is communicated with the inlet of the third three-way valve 121. The water on the low-temperature side of the second condenser 120 absorbs heat and is discharged. One outlet of the third three-way valve 121 is communicated with the inlet of the working fluid pump 122. The outlet of the working fluid pump 122 is communicated with the other inlet of the second mixer 117. The other outlet of the third three-way valve 121 is communicated with the inlet of the second throttle valve 123. The outlet of the second throttle valve 123 is communicated with the low-temperature side inlet of the second evaporator 124. The water on the high-temperature side of the evaporator 11 releases heat and supplies cooling to users. The low-temperature side outlet of the second evaporator 124 is communicated with the inlet of the second compressor 125. The outlet of the second compressor 125 is communicated with the other inlet of the third mixer 119. This system can efficiently and sustainably utilize solar energy resources, realizes the compatibility of combined cooling, heating and power supply while having 7 operation modes, effectively improves the energy system efficiency under the condition of variable user demand on the demand side, and enriches the supply mode of energy products. The system method provided by the present invention has the characteristics of high energy utilization efficiency and rich energy product supply, and has important significance for solving the problem of variable user demand in specific regions.

[0020] Further, first, the solar collector 105 absorbs sunlight from the outside world and directly heats the heat transfer oil, thereby converting light energy into heat energy. The heated heat transfer oil is branched in the first three-way valve 106. A part of the heat transfer oil flows through the heat transfer oil heat exchanger 107 to heat the medium coming out of the low-temperature heat storage tank 109, and then the heated medium is stored in the high-temperature heat storage tank 110; another part of the heat transfer oil transfers heat to the organic working fluid of the combined production system in the first evaporator 111, and then is pressurized by the heat transfer oil pump 112 and mixed with the part of the heat transfer oil branched before at the first mixer 108, and then returns to the solar collector 105. Through continuous reciprocating circulation, solar energy is converted into heat energy and transferred to the trigeneration cycle. The entire trigeneration system is a closed cycle, and the operation mode is switched by adjusting the flow distribution of the organic working fluid in different energy supply modules.

[0021] Further, please refer to Figure 3, the multi-mode combined cooling, heating and power supply system includes 7 different operating modes. At point a, it represents the combined cooling, heating and power generation mode of the system, which can simultaneously provide three forms of energy: cold, heat and electricity. Under this mode condition, the organic working fluid heated by the heat transfer oil flows out of the first evaporator 111, and is split at the second three-way valve 113. Part of the organic working fluid enters the heating module 102, is pressurized by the first compressor 114 and sent to the first condenser 115, and heats the water on the other side through heat exchange to achieve heat supply to the user side. The organic working fluid that has released heat flows out of the first condenser 115, is depressurized by the first throttle valve 116, and is mixed with another stream in the second mixer 117, and then returns to the first evaporator 111 to complete the entire heat pump cycle; Another stream of organic working fluid coming out of the second three-way valve 113 enters the power generation module 103, directly drives the expander 118 to rotate, generates mechanical work to drive the generator to supply power to the user side. The exhausted gas after doing work is mixed with the stream of the refrigeration module 104 at the third mixer 119, flows through the second condenser 120 and is cooled by water, and then enters the third three-way valve 121 for splitting. The working fluid of the power generation module 103 is pressurized by the working fluid pump 122 and sent to the second mixer 117 to be mixed with the working fluid of the heating module 102, and then returns to the first evaporator 111 again to complete the entire organic Rankine cycle; Another stream of organic working fluid coming out of the third three-way valve 121 is depressurized by the second throttle valve 123, absorbs the heat of the water in the second evaporator 124 to achieve cold supply to the user side. The organic working fluid after absorbing heat is pressurized by the second compressor 125 and then remixed with the stream of the power generation module 103 in the third mixer 119 to complete the entire compression refrigeration cycle; By adjusting the flow ratio in the second three-way valve 113 and the third three-way valve 121, the regulation of the heat supply, cold supply and power generation of the combined cooling, heating and power generation system can be achieved; Point b represents the combined cooling and power generation mode of the system. In this mode, combined cooling and power generation can be achieved. When the working fluid passes through the second three-way valve 113 in this mode, all of it will enter the power generation module 103, and no working fluid will enter the heating module 102. Therefore, the system does not provide heat to the outside, and the operating principle of other processes remains unchanged; Point c represents the combined heating and power generation mode of the system. In this mode, combined heating and power generation can be achieved. When the working fluid passes through the third three-way valve 121 in this mode, all of it will enter the power generation module 103, and no working fluid will enter the refrigeration module 104. Therefore, the system does not provide cold to the outside, and the operating principle of other processes remains unchanged;At position d, it represents the combined cooling and heating mode of the system. In this mode, combined cooling and heating can be achieved. This is a special operating mode of the system. In this mode, the second three-way valve 113 and the third three-way valve 121 work simultaneously to ensure that there is working medium distribution in the heating module 102, the power generation module 103, and the refrigeration module 104. The special feature of this mode is that the mechanical work generated by the power generation module 103 is exactly equal to the sum of the compression work of the heating module 102 and the refrigeration module 104. Therefore, in this case, the system does not output electrical energy, but only outputs cooling capacity and heat; Figure 3e represents the power generation mode of the system, in which only electrical energy is output. When the organic working fluid flows through the second three-way valve 113 and the third three-way valve 121 in this mode, all of it will enter the power generation module 103, and no working fluid will enter the heating module 102 and the refrigeration module 104. Therefore, the system does not supply heat or cold to the outside; f represents the cooling mode of the system, in which only cold is output. This mode is a special operation mode of the system. When the working fluid passes through the second three-way valve 113 in this mode, all of it enters the power generation module 103, and no working fluid enters the heating module 102; at the same time, the distribution of the working fluid in the third three-way valve 121 is relatively special. The mechanical work generated in the power generation module 103 will all drive the compressor in the refrigeration cycle to operate. Therefore, there is no power output; g represents the heating mode of the system, in which only heat is output. This mode is a special operation mode of the system. When the working fluid passes through the third three-way valve 121 in this mode, all of it enters the power generation module 103, and no working fluid enters the refrigeration module 104; at the same time, the distribution of the working fluid in the second three-way valve 113 is relatively special. The mechanical work generated in the power generation module 103 will all drive the compressor in the heating cycle to operate. Therefore, there is no power output. By adjusting the second three-way valve 113 and the third three-way valve 121, the distribution of the organic working fluid in the heating module 102, the power generation module 103, and the refrigeration module 104 can be realized. The polygeneration system can achieve 7 different operation modes from a to g. Thus, through the solar heat collection and storage module 101, the heating module 102, the power generation module 103, and the refrigeration module 104, technologies such as solar thermal, heat pump cycle, organic Rankine cycle, and compression refrigeration cycle are adopted to construct a polygeneration cycle driven by solar energy. By adjusting the distribution of the organic working fluid in the solar heat collection and storage module 101, the heating module 102, the power generation module 103, and the refrigeration module 104, the multi-mode operation of the cycle is realized. By adopting solar thermal technology and combining with energy storage devices, solar energy resources can be effectively utilized, the sustainability of energy utilization can be enhanced, and the energy utilization efficiency can be effectively improved; aiming at problems such as the variable energy demand on the user side, the multi-mode operation of the trigeneration system can effectively provide three forms of energy: cold, heat, and electricity, and realize the reasonable combination of different types of energy, effectively reducing the available energy loss during the energy supply process. The multi-mode trigeneration energy supply system driven by solar thermal has characteristics such as high energy utilization efficiency and rich energy product supply, and is of great significance for solving the problem of variable user demands in specific regions.

[0022] When using a multi-mode trigeneration energy supply system based on solar thermal drive of the present embodiment, through the solar heat collection and energy storage module 101, the heating module 102, the power generation module 103 and the refrigeration module 104, technologies such as solar thermal, heat pump cycle, organic Rankine cycle, compression refrigeration cycle, etc. are adopted to construct a multi-generation cycle with solar energy as the driving source. By adjusting the distribution of the organic working fluid in the solar heat collection and energy storage module 101, the heating module 102, the power generation module 103 and the refrigeration module 104, the multi-mode operation of the cycle is realized. The adoption of solar thermal technology combined with an energy storage device can effectively utilize solar energy resources, enhance the sustainability of energy utilization, and effectively improve the energy utilization efficiency; in view of problems such as the variable energy demand on the user side, the multi-mode operation of the trigeneration system can effectively provide three forms of energy: cold, heat and electricity, and realize a reasonable combination of different types of energy, effectively reducing the exergy loss in the energy supply process.

[0023] What is disclosed above is only one or more preferred embodiments of the present application, and the scope of rights of the present application cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A multi-mode trigeneration energy supply system based on solar thermal drive, characterized in that: It includes a solar heat collection and storage module, a heating module, a power generation module and a refrigeration module, wherein the heating module is connected to the solar heat collection and storage module, the power generation module is connected to the solar heat collection and storage module, and the refrigeration module is connected to the power generation module; The solar energy heat collection and storage module is used to convert solar energy into thermal energy; The heating module is used to provide heat to the user side; The power generation module is used to supply power to the user side; The refrigeration module is used to provide cooling to the user side.

2. The multi-mode trigeneration energy supply system based on solar thermal drive according to claim 1 is characterized in that: The solar thermal collection and storage module includes a solar collector, a first three-way valve, a thermal oil heat exchanger, a first mixer, a low-temperature heat storage tank, a high-temperature heat storage tank, a first evaporator, a thermal oil pump and a second three-way valve. The first three-way valve is connected to the solar collector, the thermal oil heat exchanger is connected to the first three-way valve, the low-temperature heat storage tank is connected to the thermal oil heat exchanger, the high-temperature heat storage tank is connected to the thermal oil heat exchanger, the first evaporator is connected to the first three-way valve, the thermal oil pump is connected to the first evaporator, the first mixer is respectively connected to the thermal oil heat exchanger and the thermal oil pump, and is connected to the solar collector, and the second three-way valve is connected to the first evaporator.

3. The multi-mode trigeneration energy supply system based on solar thermal drive according to claim 2 is characterized in that: The heating module includes a first compressor, a first condenser, a first throttle valve and a second mixer, the first compressor is connected to the second three-way valve, the first condenser is connected to the first compressor, the first throttle valve is connected to the first condenser, and the second mixer is respectively connected to the first throttle valve and the first evaporator.

4. The multi-mode trigeneration energy supply system based on solar thermal drive according to claim 3 is characterized in that: The power generation module includes an expander, a third mixer, a second condenser, a third three-way valve and a working fluid pump. The expander is connected to the second three-way valve, the third mixer is connected to the expander, the second condenser is connected to the third mixer, the third three-way valve is connected to the second condenser, and the working fluid pump is respectively connected to the third three-way valve and the second mixer.

5. The multi-mode trigeneration energy supply system based on solar thermal drive according to claim 4 is characterized in that: The refrigeration module includes a second throttle valve, a second evaporator and a second compressor, the second throttle valve is connected to the third three-way valve, the second evaporator is connected to the second throttle valve, and the second compressor is connected to the second evaporator and the third mixer respectively.

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