Open-closed cycle combined power generation system

Abstract

The present application proposes an open-closed cycle composite power generation system, comprising: an open cycle system (1), wherein the open cycle system (1) comprises an open cycle turbine generator, a preheater (12) and an exhaust gas heat exchanger (16); and a closed cycle system (2), wherein the closed cycle system (2) comprises a closed cycle turbine generator, wherein the open cycle system (1) and the closed cycle system (2) are coupled via the preheater (12) and the exhaust gas heat exchanger (16), the heat of the working fluid of the open cycle system (1) can be transferred to the working fluid of the closed cycle system (2) via the exhaust gas heat exchanger (16), and the heat of the working fluid of the closed cycle system (2) can be transferred to the working fluid of the open cycle system (1) via the preheater (12).

Description

Technical Field

[0001] The present application belongs to the field of energy and power technology, and in particular relates to an open-closed cycle composite power generation system. Background Art

[0002] A turbine power generation system uses a turbine as its core component. High-temperature, high-pressure working fluid drives the turbine to produce work, which in turn drives a generator to convert mechanical energy into electrical energy. Existing turbine power generation systems include open-cycle, closed-cycle, and combined-cycle systems.

[0003] The working fluid of the open cycle system is connected to the atmosphere, and direct combustion is usually used to heat the working fluid. The system has a large power generation capacity and a high power-to-weight ratio.

[0004] The working fluid in a closed-loop system is not connected to the outside world and is typically heated indirectly through a heat exchanger or other means. Therefore, the maximum working fluid temperature is lower than that of a working fluid heated directly by combustion. Furthermore, a closed-loop system requires an additional cooler to cool the working fluid at the turbine outlet, thus forming a closed loop.

[0005] Due to the difference in operating temperatures between open and closed circulation systems, they can be combined to form a combined circulation system. Existing combined circulation systems connect open and closed circulation systems in series, transferring exhaust heat from the open circulation system to the closed circulation system, achieving cascaded utilization of thermal energy and improving system thermal efficiency.

[0006] However, with technological advancements, the turbine operating temperature and exhaust temperature of open-cycle systems continue to increase, which requires that the turbine operating temperature of closed-cycle systems also continue to increase, resulting in an increase in the temperature of the turbine outlet and an increase in the amount of cooling required for the closed cycle, which in turn causes part of the energy to be dissipated into the environment as waste heat, reducing the thermal efficiency of the combined cycle system. Summary of the Invention

[0007] The present application aims to propose an open-closed cycle composite power generation system to reduce the overall waste heat emitted by the circulation system, thereby improving the thermal efficiency of the turbine power generation system.

[0008] The embodiment of the present application proposes an open-closed cycle combined power generation system, comprising:

[0009] An open cycle system comprising an open cycle turbine generator, a preheater and an exhaust gas heat exchanger; and

[0010] A closed-cycle system comprising a closed-cycle turbine generator,

[0011] In which, the open circulation system and the closed circulation system are coupled through the preheater and the exhaust gas heat exchanger, the heat of the working fluid of the open circulation system can be transferred to the working fluid of the closed circulation system through the exhaust gas heat exchanger, and the heat of the working fluid of the closed circulation system can be transferred to the working fluid of the open circulation system through the preheater.

[0012] In at least one possible embodiment, the open cycle system further includes a compressor and a combustion chamber, and the preheater is disposed between the compressor and the combustion chamber.

[0013] In at least one possible embodiment, the closed-cycle system further includes a cooler, and the preheater is disposed between the closed-cycle turbine generator and the cooler.

[0014] In at least one possible embodiment, the closed-cycle system further includes a compressor, and the exhaust gas heat exchanger is disposed between the compressor and the closed-cycle turbine generator.

[0015] In at least one possible embodiment, the exhaust gas heat exchanger includes a first exhaust gas heat exchanger feed port, a first exhaust gas heat exchanger discharge port, a second exhaust gas heat exchanger feed port, and a second exhaust gas heat exchanger discharge port.

[0016] The first feed port of the tail gas heat exchanger is communicated with the first discharge port of the tail gas heat exchanger, and the second feed port of the tail gas heat exchanger is communicated with the second discharge port of the tail gas heat exchanger.

[0017] The first feed port of the tail gas heat exchanger is connected to the working medium outlet of the open cycle turbine of the open cycle turbine generator.

[0018] The first outlet of the tail gas heat exchanger is connected to the atmosphere or tail gas treatment equipment.

[0019] The second feed port of the tail gas heat exchanger is connected to the outlet of the compressor,

[0020] The second discharge port of the tail gas heat exchanger is connected to the working medium inlet of the closed-cycle turbine of the closed-cycle turbine generator.

[0021] In at least one possible embodiment, the preheater includes a first preheater feed port, a first preheater discharge port, a second preheater feed port, and a second preheater discharge port.

[0022] The first feed port of the preheater is communicated with the first discharge port of the preheater, and the second feed port of the preheater is communicated with the second discharge port of the preheater.

[0023] The first feed port of the preheater is connected to the outlet of the compressor,

[0024] The first discharge port of the preheater is connected to the inlet of the combustion chamber.

[0025] The second feed port of the preheater is connected to the working medium outlet of the closed-cycle turbine of the closed-cycle turbine generator.

[0026] The second discharge port of the preheater is connected to the inlet of the cooler.

[0027] In at least one possible embodiment, the closed circulation system further includes a regenerator.

[0028] The preheater is arranged between the closed-cycle turbine generator and the regenerator, and the regenerator is arranged between the compressor and the exhaust gas heat exchanger.

[0029] The heat of the working medium of the closed circulation system in the preheater can be transferred to the working medium coming out of the compressor through the regenerator.

[0030] In at least one possible embodiment, the closed circulation system further includes a cooler.

[0031] The regenerator comprises a first feed port, a first discharge port, a second feed port and a second discharge port, wherein the first feed port is connected to the first discharge port, and the second feed port is connected to the second discharge port.

[0032] The first feed port of the regenerator is connected to the outlet of the compressor,

[0033] The first outlet of the regenerator is connected to the cold side inlet of the tail gas heat exchanger.

[0034] The second feed port of the regenerator is connected to the hot side discharge port of the preheater.

[0035] The second discharge port of the regenerator is connected to the inlet of the cooler.

[0036] In at least one possible embodiment, the open circulation system further includes a secondary tail gas heat exchanger.

[0037] The secondary exhaust gas heat exchanger is configured to receive the working fluid of the open circulation system discharged from the exhaust gas heat exchanger.

[0038] In at least one possible embodiment, the secondary exhaust gas heat exchanger is configured to receive the working fluid of the closed-cycle system discharged from the compressor, and pass the working fluid of the closed-cycle system to the closed-cycle turbine generator.

[0039] By adopting the above technical solution, the open circulation system and the closed circulation system are coupled through the preheater and the exhaust gas heat exchanger, so that the open circulation system and the closed circulation system can utilize each other's waste heat, reduce waste heat emissions, and improve the thermal efficiency of the open-closed circulation composite power generation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic structural diagram of an open-closed cycle combined power generation system according to the first embodiment of the present application is shown.

[0041] Figure 2 A schematic structural diagram of an open-closed cycle combined power generation system according to a second embodiment of the present application is shown.

[0042] Figure 3 A schematic structural diagram of an open-closed cycle combined power generation system according to a third embodiment of the present application is shown.

[0043] Description of Reference Numerals

[0044] 1 Open cycle system 11 Compressor

[0045] 12 Preheater 121 Preheater first feed port 122 Preheater first discharge port 123 Preheater second feed port 124 Preheater second discharge port

[0046] 13 Combustion chamber 14 Open cycle turbine 15 Open cycle motor

[0047] 16 Exhaust gas heat exchanger 161 Exhaust gas heat exchanger first feed port 162 Exhaust gas heat exchanger first discharge port 163 Exhaust gas heat exchanger second feed port 164 Exhaust gas heat exchanger second discharge port

[0048] 17 Secondary exhaust heat exchanger 171 Secondary exhaust heat exchanger first feed port 172 Secondary exhaust heat exchanger first discharge port 173 Secondary exhaust heat exchanger second feed port 174 Secondary exhaust heat exchanger second discharge port

[0049] 2 Closed cycle system 21 Compressor 22 Closed cycle turbine 23 Closed cycle motor 24 Cooler

[0050] 25 Regenerator 251 Regenerator first feed port 252 Regenerator first discharge port 253 Regenerator second feed port 254 Regenerator second discharge port DETAILED DESCRIPTION

[0051] In order to more clearly illustrate the above-mentioned purposes, features and advantages of the present application, this section describes in detail the specific embodiments of the present application in conjunction with the accompanying drawings. In addition to the various embodiments described in this section, the present application can also be implemented in other different ways. Without violating the spirit of the present application, those skilled in the art can make corresponding improvements, deformations and substitutions. Therefore, the present application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application shall be based on the claims.

[0052] like Figure 1 As shown, the embodiment of the present application proposes an open-closed cycle combined power generation system, which includes an open cycle system 1 and a closed cycle system 2.

[0053] The open cycle system 1 includes a compressor 11 , a preheater 12 , a combustion chamber 13 , an open cycle turbine 14 , an open cycle motor 15 and an exhaust gas heat exchanger 16 .

[0054] The preheater 12 is a heat exchange device that allows heat exchange between the working fluid in the first channel (the working fluid of the open circulation system) and the working fluid in the second channel (the working fluid of the closed circulation system). The preheater 12 includes a first channel and a second channel. The first channel is provided with a first preheater feed port (cold side feed port) 121 and a first preheater discharge port (cold side discharge port) 122 at both ends. The second channel is provided with a second preheater feed port (hot side feed port) 123 and a second preheater discharge port (hot side feed port) 124 at both ends.

[0055] The compressor 11 is used to compress the working medium (such as air) of the open cycle system, thereby continuously providing compressed high-pressure working medium (air) to the combustion chamber 13.

[0056] The first preheater feed port 121 can be connected to the outlet of the compressor 11 , and the first preheater discharge port 122 can be connected to the inlet of the combustion chamber 13 . The second preheater feed port 123 and the second preheater discharge port 124 are connected to the closed circulation system 2 .

[0057] The combustion chamber 13 is a device for burning a mixture of high-pressure air compressed by the compressor 11 and fuel. The chemical energy of the fuel can be converted into thermal energy through combustion.

[0058] The open-cycle turbine 14 is connected to an open-cycle motor 15. Together, they form an open-cycle turbine generator. The outlet of the combustion chamber 13 is connected to the open-cycle turbine 14. The expansion of the high-temperature, high-pressure combustion gases creates work that rotates the open-cycle turbine 14, converting the working fluid's thermal energy into mechanical energy. The open-cycle turbine 14 drives the open-cycle motor 15, converting the mechanical energy into electrical energy.

[0059] The exhaust gas heat exchanger 16 is a heat exchange device. The exhaust gas heat exchanger 16 includes a third channel and a fourth channel. The two ends of the third channel are respectively provided with a first exhaust gas heat exchanger feed port 161 (hot side feed port) and a first exhaust gas heat exchanger discharge port (hot side discharge port) 162. The two ends of the fourth channel are respectively provided with a second exhaust gas heat exchanger feed port (cold side feed port) 163 and a second exhaust gas heat exchanger discharge port (cold side discharge port) 164.

[0060] The first feed port 161 of the exhaust heat exchanger is connected to the open cycle turbine 14 , and the first discharge port 162 of the exhaust heat exchanger can be connected to the atmosphere or an exhaust gas treatment device.

[0061] The closed-loop system 2 includes a compressor 21, a closed-loop turbine 22, a closed-loop motor 23, and a cooler 24. The working fluid in the closed-loop system can flow sequentially through the compressor 21, the exhaust heat exchanger 16, the closed-loop turbine 22, the preheater 12, and the cooler 24, and then return to the compressor 21, forming a closed circulation loop without being discharged to the outside.

[0062] The compressor 21 can compress the working fluid (e.g., supercritical carbon dioxide) of the closed-loop system, thereby continuously providing high-pressure working fluid to the exhaust heat exchanger 16. The outlet of the compressor 21 is connected to the second feed port 163 of the exhaust heat exchanger, and the inlet of the compressor 21 is connected to the outlet of the cooler 24. The compressor 21 can obtain the working fluid of the closed-loop system at a lower temperature from the cooler 24.

[0063] The second outlet 164 of the exhaust gas heat exchanger is connected to the closed-cycle turbine 22. The exhaust gas heat exchanger 16 can use the working fluid of the open-cycle system at the outlet of the open-cycle turbine 14 to heat the working fluid of the closed-cycle system at the outlet of the compressor 21 of the closed-cycle system 2, and transfer the heat of the high-temperature working fluid at the outlet of the open-cycle turbine 14 to the working fluid of the closed-cycle system, thereby increasing the temperature of the working fluid at the inlet of the closed-cycle turbine.

[0064] Closed-cycle turbine 22 is connected to closed-cycle motor 23. Together, closed-cycle turbine 22 and closed-cycle motor 23 form a closed-cycle turbine generator. Closed-cycle turbine 22 utilizes the expansion of high-temperature, high-pressure gas discharged from the second outlet 164 of the exhaust heat exchanger to generate work, causing closed-cycle turbine 22 to rotate, converting thermal energy into mechanical energy. Closed-cycle turbine 22 then drives closed-cycle motor 23, converting mechanical energy into electrical energy.

[0065] The outlet of the closed-cycle turbine 22 is connected to the second feed port 123 of the preheater, so that the high-temperature working fluid discharged from the closed-cycle turbine 22 is used to preheat the low-temperature working fluid of the open-cycle system.

[0066] The inlet of the cooler 24 is connected to the second discharge port 124 of the preheater, and the outlet of the cooler 24 is connected to the inlet of the compressor 21. The cooler 24 is used to cool the working medium of the closed cycle system and restore the working medium to an uncompressed state.

[0067] The preheater 12 and the tail gas heat exchanger 16 are heat exchange devices that couple the open circulation system 1 and the closed circulation system 2 , so that the working fluid of the open circulation system 1 and the working fluid of the closed circulation system 2 can exchange heat.

[0068] The open-closed cycle combined power generation system of the present application has the following advantages.

[0069] (1) The preheater 12 can utilize the heat of the working fluid of the closed cycle system at the outlet of the closed cycle turbine 22 to preheat the working fluid of the open cycle system at the outlet of the compressor 11 of the open cycle system. This increases the temperature of the working fluid of the open cycle system entering the combustion chamber 13, reduces fuel consumption, and improves the power generation efficiency of the open cycle system.

[0070] (2) By transferring part of the heat in the working fluid at the outlet of the closed-cycle turbine 22 to the working fluid of the open-cycle system, the working fluid temperature of the closed-cycle system at the inlet of the cooler 24 of the closed-cycle system 2 can be reduced, so that the closed-cycle system dissipates less heat to the external environment, and the volume and weight of the cooler are smaller, thereby improving the power density of the open-closed-cycle composite power generation system.

[0071] (3) The open-closed cycle combined power generation system of the present application has fewer structural changes compared to the existing open-closed cycle combined power generation system, and is easy to improve the existing open-closed cycle combined power generation system.

[0072] (4) The open cycle system 1 and the closed cycle system 2 utilize each other's waste heat, thereby reducing waste heat emissions and improving the thermal efficiency of the open-closed cycle composite power generation system.

[0073] In the above embodiment, the preheater 12 and the exhaust gas heat exchanger 16 belong to the open circulation system 1, but the present application is not limited to this. In fact, the preheater and the exhaust gas heat exchanger are the coupling parts of the open circulation system and the closed circulation system. The preheater and the exhaust gas heat exchanger can also belong to the closed circulation system, or be independent of the open circulation system and the closed circulation system.

[0074] (Second embodiment)

[0075] like Figure 2As shown, an embodiment of the present application provides an open-closed cycle combined power generation system, which includes an open cycle system 1 and a closed cycle system 2. The open-closed cycle combined power generation system of the second embodiment differs from the open-closed cycle combined power generation system of the first embodiment in the closed cycle system 2. Components in the second embodiment that are identical or similar to those in the first embodiment are denoted by the same reference numerals.

[0076] The closed-cycle system 2 includes a compressor 21 , a closed-cycle turbine 22 , a closed-cycle motor 23 , a cooler 24 and a regenerator 25 .

[0077] The regenerator 25 is a heat exchange device. The regenerator 25 includes a fifth channel and a sixth channel. The two ends of the fifth channel are respectively provided with a first feed port (cold side feed port) 251 of the regenerator and a first discharge port (cold side discharge port) 252 of the regenerator. The two ends of the sixth channel are respectively provided with a second feed port (hot side feed port) 253 of the regenerator and a second discharge port (hot side discharge port) 254 of the regenerator.

[0078] The first feed port 251 of the regenerator is connected to the outlet of the compressor 21 , the first discharge port 252 of the regenerator is connected to the second feed port 163 of the exhaust gas heat exchanger, the second feed port 253 of the regenerator is connected to the second discharge port 124 of the preheater, and the second discharge port 254 of the regenerator is connected to the inlet of the cooler 24 .

[0079] When the working medium temperature at the second outlet 124 of the preheater is still higher than the working medium temperature at the outlet of the compressor 21 , energy can be recovered and utilized through the regenerator 25 .

[0080] In the closed circulation system of the heat recovery structure of the second embodiment, the working fluid of the closed circulation system with a higher temperature discharged from the second discharge port 124 of the preheater can be used to heat the working fluid of the closed circulation system with a lower temperature before it comes out of the compressor 21 and enters the exhaust gas heat exchanger 16, thereby improving the thermal energy utilization efficiency.

[0081] The open-closed cycle combined power generation system of the second embodiment of the present application applies a regenerator to the closed cycle system, which can further improve the efficiency of the closed cycle turbine generator on the basis of the first embodiment.

[0082] (Third embodiment)

[0083] like Figure 3As shown, an embodiment of the present application provides an open-closed cycle combined power generation system, which includes an open cycle system 1 and a closed cycle system 2. The open-closed cycle combined power generation system of the third embodiment differs from the open-closed cycle combined power generation system of the second embodiment in the open cycle system 1. Components in the third embodiment that are identical or similar to those in the second embodiment are denoted by the same reference numerals.

[0084] The open cycle system 1 includes a compressor 11 , a preheater 12 , a combustion chamber 13 , an open cycle turbine 14 , an open cycle motor 15 , an exhaust gas heat exchanger 16 and a secondary exhaust gas heat exchanger 17 .

[0085] The secondary exhaust gas heat exchanger 17 includes a seventh channel and an eighth channel. The two ends of the seventh channel are respectively provided with a first feed port (hot side feed port) 171 of the secondary exhaust gas heat exchanger and a first discharge port (hot side discharge port) 172 of the secondary exhaust gas heat exchanger. The two ends of the eighth channel are respectively provided with a second feed port (cold side feed port) 173 of the secondary exhaust gas heat exchanger and a second discharge port (cold side discharge port) 174 of the secondary exhaust gas heat exchanger.

[0086] The secondary exhaust heat exchanger first feed port 171 is connected to the exhaust heat exchanger first discharge port 162. The secondary exhaust heat exchanger first discharge port 172 can be connected to the atmosphere or exhaust gas treatment equipment. The secondary exhaust heat exchanger second feed port 173 can be connected to the outlet of the compressor 21, and the secondary exhaust heat exchanger second discharge port 174 can be connected to the exhaust heat exchanger second feed port 163.

[0087] This embodiment uses a multi-stage endothermic cycle, in which the heat exchanger can have two stages, including an exhaust gas heat exchanger 16 and a secondary exhaust gas heat exchanger 17. In this way, the working fluid of the closed circulation system can undergo step-by-step heat exchange according to the temperature, thereby improving the system efficiency.

[0088] The preheater 12, the exhaust gas heat exchanger 16 and the secondary exhaust gas heat exchanger 17 are coupled heat exchange devices between the open circulation system and the closed circulation system.

[0089] The exhaust gas heat exchanger 16 and the secondary exhaust gas heat exchanger 17 sequentially utilize the heat from the higher-temperature working fluid at the outlet of the open-cycle turbine 14 to heat the working fluid of the closed-cycle system. The temperature of the secondary exhaust gas heat exchanger 17 is lower than that of the exhaust gas heat exchanger 16 and is used to heat the working fluid of the closed-cycle system discharged from the outlet of the compressor 21. The temperature of the exhaust gas heat exchanger 16 is relatively high and is used to heat the mixed working fluid discharged from the first outlet 252 of the regenerator and the second outlet of the secondary exhaust gas heat exchanger 17. The combined action of the exhaust gas heat exchanger 16 and the secondary exhaust gas heat exchanger 17 can increase the total heat exchange capacity.

[0090] from Figure 3 As can be seen in FIG, the working fluid of the closed cycle system discharged from the outlet of the compressor 21 is divided into two parts, one part enters the regenerator 25 to absorb heat, and the other part enters the secondary exhaust gas heat exchanger 17 to absorb heat.

[0091] The open-closed cycle composite power generation system of the third embodiment of the present application applies a multi-stage (for example, two-stage) endothermic cycle structure to the closed cycle system, which can further improve the efficiency of the closed cycle turbine generator on the basis of the second embodiment.

[0092] In the above embodiment, the secondary exhaust gas heat exchanger 17 belongs to the open circulation system 1, but the present application is not limited to this. In fact, the secondary exhaust gas heat exchanger is a coupling part of the open circulation system and the closed circulation system. The secondary exhaust gas heat exchanger can also belong to the closed circulation system, or be independent of the open circulation system and the closed circulation system.

[0093] While the present application has been described in detail using the above-described embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described in this specification. The present application can be modified and implemented as modified embodiments without departing from the subject matter and scope of the present application as defined by the claims. Therefore, the descriptions in this specification are for illustrative purposes only and do not have any limiting meaning with respect to the present application.

Claims

1. An open-closed cycle combined power generation system, characterized in that: include: An open cycle system (1), the open cycle system (1) comprising an open cycle turbine generator, a preheater (12) and an exhaust gas heat exchanger (16); as well as A closed cycle system (2), comprising a closed cycle turbine generator, The open circulation system (1) and the closed circulation system (2) are coupled via the preheater (12) and the tail gas heat exchanger (16); the heat of the working fluid of the open circulation system (1) can be transferred to the working fluid of the closed circulation system (2) via the tail gas heat exchanger (16); and the heat of the working fluid of the closed circulation system (2) can be transferred to the working fluid of the open circulation system (1) via the preheater (12). The closed cycle system (2) further comprises a compressor (21), the exhaust gas heat exchanger (16) is arranged between the compressor (21) and the closed cycle turbine generator, The open circulation system (1) further includes a secondary tail gas heat exchanger (17) and a regenerator (25). The secondary tail gas heat exchanger (17) is configured to receive the working fluid of the open circulation system (1) discharged from the tail gas heat exchanger (16). The secondary tail gas heat exchanger (17) is configured to receive a portion of the working fluid of the closed cycle system (2) discharged from the compressor (21), and to pass the working fluid of the closed cycle system (2) to the closed cycle turbine generator through the tail gas heat exchanger (16). The preheater (12) is arranged between the closed-cycle turbine generator and the regenerator (25), and the regenerator (25) is arranged between the compressor (21) and the exhaust gas heat exchanger (16). The regenerator (25) is arranged to receive a portion of the working fluid of the closed-cycle system (2) discharged by the compressor (21). The heat of the working fluid of the closed-cycle system in the preheater (12) can be transferred to the working fluid discharged from the compressor (21) through the regenerator (25).

2. The open-closed cycle combined power generation system according to claim 1, characterized in that: The open cycle system (1) further comprises a compressor (11) and a combustion chamber (13), and the preheater (12) is arranged between the compressor (11) and the combustion chamber (13).

3. The open-closed cycle combined power generation system according to claim 2, characterized in that: The closed cycle system (2) further includes a cooler (24), and the preheater (12) is arranged between the closed cycle turbine generator and the cooler (24).

4. The open-closed cycle combined power generation system according to claim 1, characterized in that: The tail gas heat exchanger (16) comprises a first tail gas heat exchanger feed port (161), a first tail gas heat exchanger discharge port (162), a second tail gas heat exchanger feed port (163) and a second tail gas heat exchanger discharge port (164). The first feed port (161) of the tail gas heat exchanger is connected to the first discharge port (162) of the tail gas heat exchanger, and the second feed port (163) of the tail gas heat exchanger is connected to the second discharge port (164) of the tail gas heat exchanger. The first feed port (161) of the tail gas heat exchanger is connected to the working medium outlet of the open cycle turbine of the open cycle turbine generator. The first outlet (162) of the tail gas heat exchanger is connected to the atmosphere or tail gas treatment equipment. The second feed port (163) of the tail gas heat exchanger is connected to the outlet of the compressor (21). The second discharge port (164) of the tail gas heat exchanger is connected to the working medium inlet of the closed-cycle turbine of the closed-cycle turbine generator.

5. The open-closed cycle combined power generation system according to claim 3, characterized in that: The preheater (12) includes a first preheater feed port (121), a first preheater discharge port (122), a second preheater feed port (123) and a second preheater discharge port (124). The first feed port (121) of the preheater is connected to the first discharge port (122) of the preheater, and the second feed port (123) of the preheater is connected to the second discharge port (124) of the preheater. The first feed port (121) of the preheater is connected to the outlet of the compressor (11). The first discharge port (122) of the preheater is connected to the inlet of the combustion chamber (13). The second feed port (123) of the preheater is connected to the working medium outlet of the closed-cycle turbine of the closed-cycle turbine generator. The second discharge port (124) of the preheater is connected to the inlet of the cooler (24).

6. The open-closed cycle combined power generation system according to claim 1, characterized in that: The closed circulation system (2) further includes a cooler (24), The regenerator (25) comprises a first regenerator feed port (251), a first regenerator discharge port (252), a second regenerator feed port (253) and a second regenerator discharge port (254); the first regenerator feed port (251) and the first regenerator discharge port (252) are in communication with each other, and the second regenerator feed port (253) and the second regenerator discharge port (254) are in communication with each other. The first feed port (251) of the regenerator is connected to the outlet of the compressor (21). The first outlet port (252) of the regenerator is connected to the cold side feed port of the tail gas heat exchanger (16). The second feed port (253) of the regenerator is connected to the hot side discharge port of the preheater (12). The second discharge port (254) of the regenerator is connected to the inlet of the cooler (24).

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