Injection type ORC combined cooling heating and power system

Abstract

The invention provides an ejection type ORC combined cooling heating and power system which comprises a heat pump branch and an ORC branch, the heat pump branch comprises a compressor, a condenser, an ejector, a gas-liquid separator, a flow control valve and a first evaporator which are sequentially connected, and the ORC branch comprises a working fluid pump, a second evaporator and an expansion machine. An outlet of the condenser is connected with a first inlet of the ejector, an outlet of the expansion machine is connected with a second inlet of the ejector, an outlet of the ejector is shunted through the gas-liquid separator, a gas phase returns to the compressor for gas supplementing and enthalpy increasing, one liquid phase path is pumped into the ORC branch through working fluid, and the other liquid phase path enters the first evaporator for refrigeration after being throttled and depressurized through the flow control valve. The working medium at the outlet of the condenser is used for ejecting the low-pressure working medium at the outlet of the expansion machine, the heat transfer temperature difference is eliminated in the mixing and boosting process, the exhaust temperature of the compressor is reduced, the heating capacity of the condenser is improved, the expansion machine is allowed to operate at low pressure, the expansion power capacity is enhanced, and heat pump expansion work loss is converted into ORC additional power generation output.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial energy recovery, and in particular to an ejector-type ORC combined cooling, heating and power system. Background Art

[0002] As global industrialization accelerates, energy consumption is surging, leading to resource shortages. Simultaneously, the ineffective discharge of large amounts of low-temperature industrial waste heat exacerbates environmental pollution and the greenhouse effect. The widespread underutilization of energy in industrial production leads to a significant waste of low-grade thermal energy resources. To improve energy efficiency, secure future energy supplies, and reduce carbon emissions, the development of efficient and reliable energy recovery technologies is urgently needed.

[0003] The industrial sector possesses abundant low-grade thermal energy. Effectively converting this energy into electricity can not only replace fossil fuel consumption and alleviate the energy crisis, but also reduce waste heat emissions and promote sustainable development. Currently, mainstream low-temperature waste heat power generation technologies include the Organic Rankine Cycle (ORC) and the Kalina Cycle (KC). ORC, with its advantages of low operating pressure, simple system structure, high economic efficiency, and flexible and reliable operation, has garnered widespread attention in the field of low-grade thermal energy recovery, becoming a key solution for industrial waste heat power generation.

[0004] However, traditional ORC systems are limited by the characteristics of low-temperature heat sources and the physical properties of organic working fluids, making it difficult to achieve a breakthrough in energy conversion efficiency, resulting in low power generation efficiency. Moreover, the proportion of power consumed by the working fluid pump in small ORCs is too high, significantly reducing the system's net output efficiency.

[0005] On the other hand, the demand for heating and cooling in industrial and civil sectors continues to grow, and inefficient thermal management leads to a large amount of primary energy waste. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an ejector-type ORC combined cooling, heating and power system, which aims to solve the problems of low net output efficiency and large amounts of primary energy wasted in industrial and civilian applications of conventional ORC systems.

[0007] The present invention provides an ejector-type ORC combined cooling, heating and power system, comprising: A heat pump branch, comprising a compressor, a condenser, an ejector, a gas-liquid separator, a flow control valve, and a first evaporator, wherein two ends of a first heat exchange channel of the condenser are respectively connected to an outlet of the compressor and a first inlet of the ejector, the outlet of the ejector is connected to an inlet of the gas-liquid separator, a gas phase outlet of the gas-liquid separator is connected to the first inlet of the compressor, and a liquid phase outlet of the gas-liquid separator is connected to an inlet of the flow control valve, two ends of a first heat exchange channel of the first evaporator are respectively connected to an outlet of the flow control valve and an inlet of the compressor, and the flow control valve is used to reduce fluid pressure; The ORC branch includes a working fluid pump, a second evaporator and an expander. The inlet of the working fluid pump is connected to the liquid phase outlet of the gas-liquid separator. The two ends of the first heat exchange channel of the second evaporator are respectively connected to the outlet of the working fluid pump and the inlet of the expander. The outlet of the expander is connected to the second inlet of the ejector.

[0008] The ejector-type ORC combined cooling, heating and power system provided by the present invention further includes a heat exchanger and a liquid storage tank, wherein a high-temperature fluid is introduced into the second heat exchange channel of the second evaporator, and the outlet of the second heat exchange channel of the second evaporator is connected to the first heat exchange channel of the heat exchanger, and a low-temperature fluid is introduced into the second heat exchange channel of the heat exchanger, and the outlet of the second heat exchange channel of the heat exchanger is connected to the inlet of the second heat exchange channel of the condenser, and the outlet of the second heat exchange channel of the condenser is connected to the inlet of the liquid storage tank.

[0009] According to the ejector-type ORC cogeneration system provided by the present invention, the working fluid pump and the flow control valve are connected to the liquid phase outlet of the gas-liquid separator via a control valve group. The control valve group is used to control the liquid phase outlet of the gas-liquid separator to be connected to either the working fluid pump or the flow control valve, or to control the liquid phase outlet of the gas-liquid separator to be connected to both the working fluid pump and the flow control valve.

[0010] According to the ejector-type ORC combined cooling, heating and power system provided by the present invention, the control valve group includes a three-way valve.

[0011] According to the ejector-type ORC combined cooling, heating and power system provided by the present invention, the compressor is an air-supplementing compressor.

[0012] According to the ejector-type ORC combined cooling, heating and power system provided by the present invention, the flow control valve includes an expansion valve or a capillary tube.

[0013] According to the ejector-type ORC combined cooling, heating and power system provided by the present invention, the ejector is an area-adjustable ejector.

[0014] The present invention has the following advantages due to the adoption of the above technical solution: The ejector ORC combined cooling, heating and power system provided by the application comprises a heat pump branch and an ORC branch, wherein the heat pump branch comprises a compressor, a condenser, an ejector, a gas-liquid separator, a flow control valve and a first evaporator, and the ORC branch comprises a working fluid pump, a second evaporator and an expander. The two ends of the first heat exchange channel of the condenser are connected with the outlet of the compressor and the first inlet of the ejector respectively, the outlet of the ejector is connected with the inlet of the gas-liquid separator, the gas phase outlet of the gas-liquid separator is connected with the first inlet of the compressor, the liquid phase outlet of the gas-liquid separator is connected with the inlet of the flow control valve, the two ends of the first heat exchange channel of the first evaporator are connected with the outlet of the flow control valve and the inlet of the compressor respectively, and the flow control valve is used to reduce the fluid pressure. The inlet of the working fluid pump is connected with the liquid phase outlet of the gas-liquid separator, the two ends of the first heat exchange channel of the second evaporator are connected with the inlet of the working fluid pump and the inlet of the expander respectively, and the outlet of the expander is connected with the second inlet of the ejector. The system has only one condenser for providing medium-temperature heat, thereby saving one condenser and reducing the investment cost of the combined system compared with a conventional ORC combined heat pump system. The heat pump branch utilizes the thermal energy of the working medium at the outlet of the expander of the ORC branch, realizes the air injection and enthalpy increase of the compressor, reduces the exhaust temperature of the compressor, and improves the heating capacity of the condenser in the heat pump branch. The liquid phase outlet of the gas-liquid separator is divided into two streams, one stream of fluid returns to the ORC branch, and the other stream of fluid is reduced in pressure by the flow control valve and then absorbs heat in the second evaporator to provide cold energy. The ejector is a key connecting component of the heat pump branch and the ORC branch, avoids the existence of irreversible heat transfer temperature difference in the conventional combined cycle in terms of heat utilization, and improves the overall operation efficiency of the system. The two streams of fluid at different temperatures are mixed in the ejector to complete the exchange of momentum, heat and energy. The introduction of the ejector into the ORC branch allows the expander to have a lower exhaust back pressure, and the expansion work capacity of the working fluid is improved. The reduction of the working fluid pressure at the outlet of the expander is supplemented by the pressure boosting capacity of the ejector, the ejector utilizes the thermal energy and pressure energy of the working fluid at the outlet of the condenser to inject the working fluid at the outlet of the expander, and completes the heat exchange while improving the pressure. As a result, the ejector converts the expansion work loss of the heat pump branch into additional electric energy output of the expander, fully utilizes the existing components of the ORC to realize the electric energy conversion of the expansion work without increasing additional expanders. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0016] Figure 1is a principle diagram of an ejecting ORC combined heat and power system provided by an embodiment of the present application.

[0017] Reference signs: 110: compressor; 120: condenser; 130: ejector; 140: gas-liquid separator; 150: expansion valve; 160: first evaporator; 210: working fluid pump; 220: second evaporator; 230: expander; 300: three-way valve; 410: heat exchanger; 420: liquid storage tank. DETAILED DESCRIPTION

[0018] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0019] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0020] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0021] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] In the present disclosure, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over," "above," or "on top of" a second feature can mean the first feature is directly on top of or obliquely on top of the second feature, or simply means the first feature is horizontally higher than the second feature. A first feature "under," "below," or "underneath" a second feature can mean the first feature is directly under or obliquely under the second feature, or simply means the first feature is horizontally lower than the second feature.

[0023] In the description of the present disclosure, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present disclosure, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled person in the art can combine and combine the different embodiments or examples described in the present disclosure and the features of the different embodiments or examples, without contradiction.

[0024] The ejecting ORC combined cooling heating and power system provided by the application comprises a heat pump branch and an ORC branch, wherein the heat pump branch comprises a compressor, a condenser, an ejector, a gas-liquid separator, a flow control valve and a first evaporator, and the ORC branch comprises a working fluid pump, a second evaporator and an expander. The two ends of the first heat exchange channel of the condenser are connected with the outlet of the compressor and the first inlet of the ejector respectively, the outlet of the ejector is connected with the inlet of the gas-liquid separator, the gas phase outlet of the gas-liquid separator is connected with the first inlet of the compressor, the liquid phase outlet of the gas-liquid separator is connected with the inlet of the flow control valve, the two ends of the first heat exchange channel of the first evaporator are connected with the outlet of the flow control valve and the inlet of the compressor respectively, and the flow control valve is used to reduce the fluid pressure entering the first evaporator. The inlet of the working fluid pump is connected with the liquid phase outlet of the gas-liquid separator, the two ends of the first heat exchange channel of the second evaporator are connected with the inlet of the working fluid pump and the inlet of the expander respectively, and the outlet of the expander is connected with the second inlet of the ejector. The system only has one condenser for providing medium-temperature heat, saves one condenser compared with a traditional ORC coupled heat pump combined system, and reduces the investment cost of the combined system. The heat pump branch utilizes the heat energy of the working medium at the outlet of the expander of the ORC branch, realizes the air supplement and enthalpy increase of the compressor, reduces the exhaust temperature of the compressor, and improves the heating capacity of the condenser in the heat pump branch. The liquid phase outlet of the gas-liquid separator is divided into two streams, one stream of fluid returns to the ORC branch, and the other stream of fluid is reduced in pressure through the flow control valve and then absorbs heat in the second evaporator to provide cold energy. The ejector is a key connecting component of the heat pump branch and the ORC branch, avoids the existence of irreversible heat transfer temperature difference in a traditional combined cycle in terms of heat utilization, and improves the overall operation efficiency of the system. The two streams of fluid at different temperatures are mixed in the ejector to complete momentum, heat and energy exchange. After the introduction of the ejector into the ORC branch, the expander has a lower exhaust back pressure, and the expansion work capacity of the working fluid is improved. The reduction of the working fluid pressure at the outlet of the expander is supplemented by the pressure increasing capacity of the ejector, the ejector utilizes the heat energy and pressure energy of the working fluid at the outlet of the condenser to inject the working fluid at the outlet of the expander, and completes heat exchange while improving the pressure. As a result, the ejector converts the expansion work loss of the heat pump branch into additional electric energy output of the expander, fully utilizes the existing components of the ORC to realize the electric energy conversion of the expansion work without increasing additional expanders.

[0025] The application will be described below Figure 1 The ejecting ORC combined cooling heating and power system of the application is described.

[0026] The ejecting ORC combined cooling heating and power system provided by the embodiment of the application comprises a heat pump branch and an ORC branch, wherein the heat pump branch comprises a compressor 110, a condenser 120, an ejector 130, a gas-liquid separator 140, a flow control valve and a first evaporator 160, and the ORC branch comprises a working fluid pump 210, a second evaporator 220 and an expander 230.

[0027] The condenser 120, the first evaporator 160 and the second evaporator 220 are all heat exchange devices in nature, and each is internally provided with a first heat exchange channel and a second heat exchange channel.

[0028] For the heat pump branch, the connection relationship is as follows: The outlet of the compressor 110 is communicated with the inlet of the first heat exchange channel of the condenser 120, the outlet of the first heat exchange channel of the condenser 120 is connected with the first inlet of the ejector 130, the outlet of the ejector 130 is connected with the inlet of the gas-liquid separator 140, the gas phase outlet of the gas-liquid separator 140 is connected with the first inlet of the compressor 110, the liquid phase outlet is connected with the inlet of the flow control valve, the outlet of the flow control valve is connected with the inlet of the first heat exchange channel of the first evaporator 160, and the outlet of the first heat exchange channel of the first evaporator 160 is connected with the inlet of the compressor 110.

[0029] For the ORC branch, the connection relationship is as follows: The inlet of the working fluid pump 210 is connected with the liquid phase outlet of the gas-liquid separator 140, the outlet of the working fluid pump 210 is connected with the inlet of the first heat exchange channel of the second evaporator 220, the outlet of the first heat exchange channel of the second evaporator 220 is communicated with the inlet of the expander 230, and the outlet of the expander 230 is connected with the second inlet of the ejector 130.

[0030] The flow control valve can be an expansion valve 150 or a capillary tube, and in this embodiment, the flow control valve uses the expansion valve 150.

[0031] The expansion valve 150 and the working fluid pump 210 are connected with the liquid phase outlet of the gas-liquid separator 140 through a control valve group, and the control valve group can be a three-way valve 300.

[0032] The working process of the ejector type ORC combined cooling, heating and power generation system provided by the application is as follows: The working fluid enters the expander 230 after absorbing low-grade waste heat in the second evaporator 220, expands externally to generate power, and then serves as the secondary flow of the ejector 130. The working fluid passing through the ejector 130 enters the gas-liquid separator 140, and is separated into a gas phase and a liquid phase after passing through the gas-liquid separator 140. The gas phase enters the compressor 110 through the first inlet of the compressor 110 and becomes the intermediate supplementary gas of the compressor 110. The liquid phase is divided into two streams, one of which is pressurized by the working fluid pump 210 and then enters the second evaporator 220 to absorb heat, completing a cycle, and the other of which is depressurized by the expansion valve 150 and then enters the first evaporator 160 to absorb heat and become saturated steam. The saturated steam enters the compressor 110, and the working fluid at the outlet of the compressor 110 is cooled by the condenser 120 and becomes the primary flow of the ejector 130, which injects the secondary flow at the outlet of the expander 230.

[0033] The introduction of the ejector 130 and the compression heat pump and the system design reduce the outlet pressure of the expander 230 and increase the expansion work output to the outside. The compression of the compressor 110 replaces the pressure boosting function of the working fluid pump 210 in the basic ejector ORC, and the working fluid at the outlet of the condenser 120 is used as the primary flow of the ejector 130, so that the expansion work recovery of the compression heat pump system is realized. The introduction of the first evaporator 160 in the compression heat pump system creates a cold output and realizes the combined cooling, heating and power generation of the system.

[0034] The liquid phase outlet of the gas-liquid separator 140 in the system is divided into two streams, one of which enters the heat pump branch to complete refrigeration and heating, and the other enters the ORC branch to expand and do work outside. The liquid phase splitting design of the gas-liquid separator 140 realizes the separation of the working fluid in different systems.

[0035] The ejecting fluid of the ejector 130 is the outlet fluid of the condenser 120, and the induced fluid is the outlet fluid of the expander 230. The two fluids are mixed in the mixing chamber inside the ejector 130, realizing the coupling of the heat pump branch and the ORC branch. The coupling mechanism of the two is equivalent to the utilization of the condensation heat release of the heat pump branch to the ORC branch and the recovery of the heat energy and pressure energy of the working fluid at the outlet of the condenser 120 in the heat pump branch.

[0036] The compression heat pump system in the ejector ORC combined cooling, heating and power generation system provided by the application is a gas injection compressor, and medium-pressure gas is injected into the compressor 110, which can effectively reduce the exhaust temperature of the compressor 110, increase the exhaust volume, and improve the heating capacity.

[0037] In some embodiments, a heat exchanger 410 and a liquid storage tank 420 are further included, the inlet of the second heat exchange channel of the second evaporator 220 can be connected with a high-temperature fluid source, the outlet of the second heat exchange channel of the second evaporator 220 is connected with the inlet of the first heat exchange channel of the heat exchanger 410, the inlet of the second heat exchange channel of the heat exchanger 410 is connected with a low-temperature fluid source, the outlet of the second heat exchange channel of the heat exchanger 410 is connected with the inlet of the second heat exchange channel of the condenser 120, and the outlet of the second heat exchange channel of the condenser 120 is connected with the inlet of the liquid storage tank 420.

[0038] When the high-temperature fluid flows through the second heat exchange channel of the second evaporator 220, it exchanges heat with the fluid in the first heat exchange channel of the second evaporator. After releasing heat, the high-temperature fluid enters the first fluid channel of the heat exchanger 410. The residual heat of the high-temperature fluid is used to preheat the low-temperature fluid in the second fluid channel of the heat exchanger 410. The low-temperature fluid can be residential water, so that the energy is used in stages, and the operation performance of the overall system is improved.

[0039] The low-temperature fluid in the heat exchanger 410 absorbs heat and then enters the condenser 120 to absorb heat again, and reaches the required temperature and then enters the liquid storage tank 420.

[0040] The heat exchanger 410 in the ejector ORC combined cooling heating and power system can realize heat exchange between the high-temperature fluid after heat release of the second evaporator 220 and the low-temperature fluid to be heated in the condenser 120, and the heat exchange between the two fluids realizes the cascade utilization of energy, and increases the economy and environmental protection of the overall composite system.

[0041] The ejector ORC combined cooling heating and power system provided by the application can realize heat input of a high-temperature heat source of the composite system through the second evaporator 220 in the ORC branch absorbing heat of industrial waste heat, and can realize cold output of the composite system through the first evaporator 160 in the heat pump branch absorbing heat of a low-temperature heat source.

[0042] The ejector ORC combined cooling heating and power system provided by the application has the main characteristics of steam injection, injection of the ejector 130 and combined cooling heating and power, and realizes a simple, economical and efficient sustainable development combined cooling heating and power system through reasonable combination of system components.

[0043] The ejector ORC combined cooling heating and power system provided by the application is different from the traditional ORC coupled heat pump combined heat pump system in that the coupling mode of the ORC branch and the heat pump branch is no longer simple thermal coupling, but energy and quality coupling through the mixed pressure boosting effect of the ejector 130, and the irreversible heat transfer temperature difference and the investment of the additional intermediate heat exchanger 410 in the traditional coupling mode are overcome. While the ORC system is used to increase the efficiency of the heat pump system, the power output capacity of the ORC itself is conversely improved, and the effect of mutual assistance is realized.

[0044] In the ejector ORC combined cooling heating and power system provided by the application, the efficiency increasing mode of the ORC branch to the ejector heat pump branch is air supplement and enthalpy increase of the compressor 110, the gaseous fluid at the outlet of the ejector 130 enters the air supplement port of the compressor 110, and the efficiency increasing mode of the heat pump branch to the ORC branch is pressure boosting compensation of the back pressure reduction of the expander 230, the ejector 130 uses the high-temperature and high-pressure liquid fluid at the outlet of the condenser 120 of the heat pump branch to inject the gaseous fluid at the outlet of the expander 230, and the efficiency increasing mode of the heat pump branch to the ORC branch is pressure boosting compensation of the back pressure reduction of the expander 230.

[0045] In the embodiment of the application, the condensing temperature of the condenser 120 in the heat pump branch can be higher than 90 DEG C, and high-temperature resistant materials need to be used for the lubricating oil and sealing gasket of the compressor 110 and other components. In actual use, in order to meet the actual use requirements of the user side, the evaporator of the heat pump branch can be used to provide cold, and the condenser 120 can be used to generate medium-temperature hot water for use.

[0046] From the operation efficiency, the system has better power output ability compared with the ORC system alone, has higher heating capacity and operation performance compared with the traditional heat pump system, has less components and energy transfer loss compared with the traditional combined cooling heating and power system, the heat pump branch and the ORC branch promote each other, and improve the overall operation performance of the combined cooling heating and power system.

[0047] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An ejector-type ORC combined cooling, heating and power system, characterized in that: include: A heat pump branch comprises a compressor (110), a condenser (120), an ejector (130), a gas-liquid separator (140), a flow control valve and a first evaporator (160), wherein two ends of a first heat exchange channel of the condenser (120) are respectively connected to the outlet of the compressor (110) and the first inlet of the ejector (130), the outlet of the ejector (130) is connected to the inlet of the gas-liquid separator (140), the gas phase outlet of the gas-liquid separator (140) is connected to the first inlet of the compressor (110), the liquid phase outlet of the gas-liquid separator (140) is connected to the inlet of the flow control valve, and two ends of a first heat exchange channel of the first evaporator (160) are respectively connected to the outlet of the flow control valve and the inlet of the compressor (110), and the flow control valve is used to reduce fluid pressure; The ORC branch comprises a working fluid pump (210), a second evaporator (220) and an expander (230), wherein the inlet of the working fluid pump (210) is connected to the liquid phase outlet of the gas-liquid separator (140), the two ends of the first heat exchange channel of the second evaporator (220) are respectively connected to the outlet of the working fluid pump (210) and the inlet of the expander (230), and the outlet of the expander (230) is connected to the second inlet of the ejector (130).

2. The ejector-type ORC combined cooling, heating and power system according to claim 1, characterized in that: The invention also includes a heat exchanger (410) and a liquid storage tank (420), wherein a high-temperature fluid is introduced into the second heat exchange channel of the second evaporator (220), and an outlet of the second heat exchange channel of the second evaporator (220) is connected to the first heat exchange channel of the heat exchanger (410), and a low-temperature fluid is introduced into the second heat exchange channel of the heat exchanger (410), and an outlet of the second heat exchange channel of the heat exchanger (410) is connected to an inlet of the second heat exchange channel of the condenser (120), and an outlet of the second heat exchange channel of the condenser (120) is connected to an inlet of the liquid storage tank (420).

3. The ejector-type ORC combined cooling, heating and power system according to claim 1, characterized in that: The working fluid pump (210) and the flow control valve are connected to the liquid phase outlet of the gas-liquid separator (140) through a control valve group, and the control valve group is used to control the liquid phase outlet of the gas-liquid separator (140) to be connected to either the working fluid pump (210) or the flow control valve, or to control the liquid phase outlet of the gas-liquid separator (140) to be connected to the working fluid pump (210) and the flow control valve at the same time.

4. The ejector-type ORC combined cooling, heating and power system according to claim 3, characterized in that: The control valve group comprises a three-way valve (300).

5. The ejector-type ORC combined cooling, heating and power system according to claim 1, characterized in that: The compressor (110) is an air-supplementing compressor.

6. The ejector-type ORC combined cooling, heating and power system according to claim 1, characterized in that: The flow control valve includes an expansion valve (150) or a capillary tube.

7. The ejector-type ORC combined cooling, heating and power system according to claim 1, characterized in that: The injector (130) is an area-adjustable injector.

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