An integrated power generation system

Abstract

The application provides a comprehensive power generation system, belonging to the technical field of energy storage, comprising: a solar heat collection and storage system, a cold and heat energy power generation system and a liquid nitrogen energy release system; heat storage working medium in the solar heat collection and storage system, gas in the cold and heat energy power generation system and nitrogen in the liquid nitrogen energy release system are all communicated in different channels in a three-stream heat exchanger; the three-stream heat exchanger has two, which are a first three-stream heat exchanger and a second three-stream heat exchanger. The comprehensive power generation system provided by the application comprises the solar heat collection and storage system, the cold and heat energy power generation system and the liquid nitrogen energy release system, three kinds of systems have three kinds of flow-through mediums, and the three kinds of flow-through mediums directly flow through and exchange heat in the three-stream heat exchanger.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power generation and energy storage, in particular to a comprehensive power generation system. BACKGROUND

[0002] With the growing application of renewable energy, solar thermal power generation is an important way. The principle of solar thermal power generation is to use heliostats to focus sunlight on the heat absorber at the top of the heat collection tower to heat the heat transfer medium in the heat absorber to generate heat energy, and then generate high-temperature steam through a heat exchange system to drive a steam turbine to generate electricity. The composition of the tower type solar thermal power generation system mainly includes: heliostats, heat absorbers, heat exchangers, high and low temperature storage tanks, heat collection towers, steam turbine generator units, etc. The heat transfer medium can be air, water / steam or molten salt, etc.

[0003] Liquid nitrogen, as a product of gas separation, has a large amount of low-temperature cold energy and can also be converted into pressure energy. How to utilize the cold energy while releasing the pressure energy of liquid nitrogen is a problem that has been considered in the field. SUMMARY

[0004] Therefore, the present application provides a comprehensive power generation system for facilitating cold and heat energy exchange between a liquid nitrogen energy release system and a solar heat collection and storage system.

[0005] To solve the above technical problems, the present application provides a comprehensive power generation system, comprising:

[0006] a solar heat collection and storage system, a cold and heat energy power generation system, and a liquid nitrogen energy release system;

[0007] The heat storage medium in the solar heat collection and storage system, the gas in the cold and heat energy power generation system, and the nitrogen in the liquid nitrogen energy release system are all connected in different channels in the three-stream heat exchanger.

[0008] The three-stream heat exchanger has two, which are a first three-stream heat exchanger and a second three-stream heat exchanger.

[0009] Optionally, the solar heat collection and storage system comprises heliostats, a solar heat collector, a heat storage medium hot tank, a heat storage medium cold tank, a first heat storage medium pump, and a second heat storage medium pump.

[0010] The reflection center of the heliostats is arranged at the position of the heat collector, and the heat collector, the heat storage medium hot tank, the first heat storage medium pump, the heat storage medium cold tank, the second heat storage medium pump, and the heat collector are sequentially connected to form a circulating pipeline.

[0011] The pipeline between the first heat storage medium pump and the heat storage medium cold tank passes through the first three-stream heat exchanger.

[0012] Optionally, the cold and heat energy power generation system comprises:

[0013] The first generator, the compressor and the first expander are connected through a shaft structure, and the outlet of the compressor is communicated with the inlet of the first expander, and the outlet of the first expander is communicated with the inlet of the compressor;

[0014] The pipeline between the outlet of the compressor and the inlet of the first expander passes through the second three-stream heat exchanger and the first three-stream heat exchanger;

[0015] The pipeline between the outlet of the first expander and the inlet of the compressor passes through the second three-stream heat exchanger and the low-temperature heat exchanger in sequence.

[0016] The pipeline between the outlet of the first expander and the inlet of the compressor passes through the second three-stream heat exchanger and the low-temperature heat exchanger in sequence.

[0017] Optionally, the liquid nitrogen energy release system comprises a liquid nitrogen storage tank, a low-temperature pump, a low-temperature heat exchanger, a second expander, a third expander and a second generator;

[0018] The liquid nitrogen storage tank, the low-temperature pump, the low-temperature heat exchanger, the second expander and the third expander are communicated in sequence, and the second generator, the second expander and the third expander are connected through a shaft structure;

[0019] The pipeline between the low-temperature pump and the second expander passes through the low-temperature heat exchanger, the second three-stream heat exchanger and the first three-stream heat exchanger in sequence.

[0020] Optionally, the first three-stream heat exchanger is a high-temperature heat exchanger, and the second three-stream heat exchanger is a regenerative heat exchanger.

[0021] Optionally, the three-stream heat exchanger comprises:

[0022] A shell, a plurality of heat exchange plates are arranged in the shell, and channels allowing medium to pass through are formed between adjacent heat exchange plates, and each heat exchange plate extends outwardly with fins into adjacent channels;

[0023] The channels comprise at least three channels arranged in layers, and adjacent two channels are adapted to flow through media with different temperatures.

[0024] Optionally, the fins are arranged obliquely.

[0025] Optionally, the fins abut against adjacent heat exchange plates.

[0026] Optionally, the heat exchange plates have four heat exchange plates, and five channels are formed together with the shell.

[0027] The technical scheme of the present application has the following advantages:

[0028] 1. The integrated power generation system provided by the present application comprises a solar heat collection and storage system, a cold and heat energy power generation system and a liquid nitrogen energy release system, the three systems have three kinds of flow media, and the three kinds of flow media directly flow and exchange heat in the three-flow heat exchanger.

[0029] 2. The three-flow heat exchanger provided by the present application is provided with a plurality of heat exchange plates in the shell, the heat exchange plates are provided with fins, different temperature media flow between adjacent channels to realize heat conversion between the media, and the fins can increase the heat exchange efficiency and the pressure resistance.

[0030] 3. The three-flow heat exchanger provided by the present application is provided with the fins in an inclined manner and abutting against the adjacent heat exchange plates, so that the cross section of the channel is in the shape of a plurality of triangles, the number of the fins is increased, and the stability of the internal structure of the heat exchanger is also increased.

[0031] 4. The three-flow heat exchanger provided by the present application is provided with four heat exchange plates, which together with the shell form five channels, three kinds of fluid can flow in different channels to form multi-level energy conversion, and the heat exchange efficiency is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the following specific embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0033] Figure 1 The structure schematic view of the integrated power generation system provided by the present application is shown in Figure 1.

[0034] Figure 2 The structure schematic view of the three-flow heat exchanger provided by the present application is shown in Figure 2.

[0035] Explanation of reference signs:

[0036] 1, first generator; 2, first expander; 3, compressor; 4, second generator; 5, third expander; 6, second expander; 7, low-temperature pump; 8, liquid nitrogen storage tank; 9, second three-flow heat exchanger; 10, low-temperature heat exchanger; 11, first three-flow heat exchanger; 12, second heat storage medium pump; 13, first heat storage medium pump; 14, heat storage medium hot tank; 15, heat storage medium cold tank; 16, heat collector; 17, heliostat; 18, shell; 19, heat exchange plate; 20, fin; 21, first channel; 22, second channel; 23, third channel; 24, fourth channel; 25, fifth channel. DETAILED DESCRIPTION

[0037] The technical solutions of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are part 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 skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0041] Embodiment

[0042] The present embodiment provides a specific embodiment of a comprehensive power generation system, as shown in Figure 1 The three systems have three flow-through media, and the three flow-through media directly flow through and exchange heat in the three-stream heat exchanger in Embodiment 1.

[0043] Specifically, the three-stream heat exchanger has two, which are the first three-stream heat exchanger 11 and the second three-stream heat exchanger 9.

[0044] The solar heat collecting and storing system comprises a heliostat 17, a solar heat collector 16, a hot tank 14 of heat storing medium, a cold tank 15 of heat storing medium, a first heat storing medium pump 13, a second heat storing medium pump 12; the reflecting center of the heliostat 17 is arranged at the position of the heat collector 16, so that the heat collector 16 can more effectively absorb solar energy; the heat collector 16, the hot tank 14 of heat storing medium, the first heat storing medium pump 13, the cold tank 15 of heat storing medium, the second heat storing medium pump 12 and the heat collector 16 are sequentially connected to form a circulating pipeline, and the pipeline between the first heat storing medium pump 13 and the cold tank 15 of heat storing medium passes through the first three-stream heat exchanger 11.

[0045] The cold and heat energy power generation system comprises a first generator 1, a compressor 3 and a first expander 2; the first generator 1, the compressor 3 and the first expander 2 are connected through a shaft structure, and the outlet of the compressor 3 and the inlet of the first expander 2 are communicated, and the outlet of the first expander 2 and the inlet of the compressor 3 are communicated; the pipeline between the outlet of the compressor 3 and the inlet of the first expander 2 passes through the second three-stream heat exchanger 9 and the first three-stream heat exchanger 11; the pipeline between the outlet of the first expander 2 and the inlet of the compressor 3 sequentially passes through the second three-stream heat exchanger 9 and the low-temperature heat exchanger 10. Specifically, the gas can be air.

[0046] The liquid nitrogen energy releasing system comprises a liquid nitrogen storage tank 8, a low-temperature pump 7, a low-temperature heat exchanger 10, a second expander 6, a third expander 5 and a second generator 4; the liquid nitrogen storage tank 8, the low-temperature pump 7, the low-temperature heat exchanger 10, the second expander 6 and the third expander 5 are sequentially connected, and the second generator 4, the second expander 6 and the third expander 5 are coaxially connected; the pipeline between the low-temperature pump 7 and the second expander 6 sequentially passes through the low-temperature heat exchanger 10, the second three-stream heat exchanger 9 and the first three-stream heat exchanger 11.

[0047] Specifically, the nitrogen gas in the liquid nitrogen energy releasing system passes through the third passage 23 of the second three-stream heat exchanger 9, the gas at the outlet of the first expander 2 in the cold and heat energy power generation system passes through the second passage 22 and the fourth passage 24 of the second three-stream heat exchanger 9, and the gas at the outlet of the compressor 3 in the cold and heat energy power generation system passes through the first passage 21 and the fifth passage 25 of the second three-stream heat exchanger 9; the nitrogen gas in the liquid nitrogen energy releasing system also passes through the third passage 23 of the first three-stream heat exchanger 11, the gas at the outlet of the compressor 3 in the cold and heat energy power generation system also passes through the second passage 22 and the fourth passage 24 of the first three-stream heat exchanger 11, and the heat storing medium in the solar heat collecting and storing system passes through the first passage 21 and the fifth passage 25 of the first three-stream heat exchanger 11.

[0048] Working principle:

[0049] Before power generation, liquid nitrogen made by air separation and other ways is filled into the liquid nitrogen storage tank 8; when the solar energy is sufficient, the first heat storage working medium pump 13 is closed and the second heat storage working medium pump 12 is opened; the sun tracking mirror 17 is adjusted to converge the solar energy into the heat collector 16, the heat storage working medium in the heat storage working medium cold tank 15 absorbs heat energy after passing through the heat collector 16 under the drive of the second heat storage working medium pump 12, and the temperature of the heat storage working medium is raised, and the high-temperature heat storage working medium is stored in the heat storage working medium hot tank 14.

[0050] During power generation, the second heat storage working medium pump 12 is closed and the first heat storage working medium pump 13 is opened. The liquid nitrogen in the liquid nitrogen is lifted to high-pressure liquid state by the low-temperature pump 7, the high-pressure liquid nitrogen gas is changed into high-pressure nitrogen gas after heat exchange in the low-temperature heat exchanger 10, the high-pressure nitrogen gas enters the second three-stream heat exchanger 9 and the temperature is raised to medium-temperature high-pressure state, and the high-pressure nitrogen gas further enters the first three-stream heat exchanger 11 and the temperature is raised to high-temperature high-pressure state, the high-temperature high-pressure state nitrogen gas sequentially passes through the second expander 6 and the third expander 5 to do work, the nitrogen gas discharged from the outlet of the third expander 5 is discharged into the atmospheric environment, and the shaft work done by the second expander 6 and the third expander 5 is used to generate power by the second generator 4.

[0051] During power generation, the second heat storage working medium pump 12 is closed and the first heat storage working medium pump 13 is opened. The heat storage working medium in the heat storage working medium hot tank 14 enters the first three-stream heat exchanger 11 under the drive of the first heat storage working medium pump 13, the temperature of the heat storage working medium is lowered, and the low-temperature heat storage working medium is stored in the heat storage working medium cold tank 15. The heat in the heat storage working medium hot tank 14 is transferred to the high-pressure nitrogen gas and the compressed gas through the first three-stream heat exchanger 11. The gas in the cold and heat energy power generation system loop absorbs heat to high-temperature high-pressure state in the first three-stream heat exchanger 11, enters the first expander 2 to expand and do work, a part of the work done is used to provide the power consumption of the compressor 3 and a part is used to provide power generation of the first generator 1; the low-pressure gas from the outlet of the first expander 2 enters the second three-stream heat exchanger 9, the temperature is lowered to medium-temperature low-pressure state, further enters the low-temperature heat exchanger 10, the temperature is further lowered, the low-temperature low-pressure gas from the outlet of the low-temperature heat exchanger 10 enters the compressor 3 and is compressed to high pressure, the high-pressure gas discharged from the compressor 3 enters the second three-stream heat exchanger 9, the temperature is raised, and then enters the first three-stream heat exchanger 11.

[0052] Specifically, the first three-stream heat exchanger 11 is a high-temperature heat exchanger, and the second three-stream heat exchanger 9 is a regenerative heat exchanger.

[0053] In the embodiment, the compressor 3 and the expander are all multi-stage compressors and multi-stage expanders, and the compression ratio of each compressor 3 is between 1-10, and the expansion ratio of each expander is between 1-10.

[0054] In the embodiment, as shown in Figure 2As shown, the three-stream heat exchanger comprises a shell 18, a plurality of heat exchange plates 19 are arranged in the shell 18, and channels allowing medium to pass through are formed between adjacent heat exchange plates 19. Each heat exchange plate 19 extends a fin 20 into the adjacent channel, and the number of channels is at least three. Different temperature mediums flow through the adjacent channels respectively to realize heat conversion between the mediums in the adjacent channels. The fin 20 can increase the heat exchange efficiency and the pressure resistance.

[0055] Specifically, the fin 20 is arranged obliquely and abuts against the adjacent heat exchange plate 19, so that the cross section of the channel is a plurality of triangles. The number of fins 20 can be increased, and the stability of the internal structure of the heat exchanger can also be increased.

[0056] In the embodiment, the heat exchange plate 19 has four, and the shell 18 and the heat exchange plate 19 together form five channels, as shown. Figure 1 As shown, from top to bottom, they are a first channel 21, a second channel 22, a third channel 23, a fourth channel 24 and a fifth channel 25. Three kinds of fluids can flow in different channels respectively to form multi-level energy conversion and further improve the heat exchange efficiency.

[0057] Obviously, the above embodiments are only examples for clearly illustrating, and not limit the embodiments. For those skilled in the art, on the basis of the above description, other different forms of changes or variations can also be made. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A combined power generation system, characterized by, The application relates to a solar energy heat collecting and storing system, a cold and heat energy generating system and a liquid nitrogen energy releasing system. The heat storing medium in the solar energy heat collecting and storing system, the gas in the cold and heat energy generating system and the nitrogen in the liquid nitrogen energy releasing system are communicated in different channels of a three-stream heat exchanger. The three-stream heat exchanger has two, namely a first three-stream heat exchanger (11) and a second three-stream heat exchanger (9). The solar energy heat collecting and storing system comprises a heliostat (17), a solar energy collector (16), a heat storing medium hot tank (14), a heat storing medium cold tank (15), a first heat storing medium pump (13) and a second heat storing medium pump (12). The reflection center of the heliostat (17) is arranged at the position of the collector (16), and the collector (16), the heat storing medium hot tank (14), the first heat storing medium pump (13), the heat storing medium cold tank (15), the second heat storing medium pump (12) and the collector (16) are sequentially communicated to form a circulating pipeline. The pipeline between the first heat storing medium pump (13) and the heat storing medium cold tank (15) passes through the first three-stream heat exchanger (11). The cold and heat energy generating system comprises a first generator (1), a compressor (3) and a first expander (2). The first generator (1), the compressor (3) and the first expander (2) are connected through a shaft structure, the outlet of the compressor (3) is communicated with the inlet of the first expander (2), and the outlet of the first expander (2) is communicated with the inlet of the compressor (3). The pipeline between the outlet of the compressor (3) and the inlet of the first expander (2) passes through the second three-stream heat exchanger (9) and the first three-stream heat exchanger (11). The pipeline between the outlet of the first expander (2) and the inlet of the compressor (3) sequentially passes through the second three-stream heat exchanger (9) and a low-temperature heat exchanger (10). The liquid nitrogen energy releasing system comprises a liquid nitrogen storage tank (8), a low-temperature pump (7), a low-temperature heat exchanger (10), a second expander (6), a third expander (5) and a second generator (4). The liquid nitrogen storage tank (8), the low-temperature pump (7), the low-temperature heat exchanger (10), the second expander (6) and the third expander (5) are sequentially communicated, and the second generator (4), the second expander (6) and the third expander (5) are connected through a shaft structure. The pipeline between the low-temperature pump (7) and the second expander (6) sequentially passes through the low-temperature heat exchanger (10), the second three-stream heat exchanger (9) and the first three-stream heat exchanger (11). The first three-stream heat exchanger (11) is a high-temperature heat exchanger, and the second three-stream heat exchanger (9) is a regenerative heat exchanger. The three-stream heat exchanger comprises a shell (18) provided with a plurality of heat exchange plates (19), adjacent heat exchange plates (19) form channels allowing medium to pass through, and each heat exchange plate (19) extends a fin (20) into the adjacent channel.

2. The integrated power generation system of claim 1, wherein, ​ 3. The integrated power generation system of claim 1, wherein, ​ ​ The channels include at least three in a stacked arrangement, and two adjacent channels are adapted to flow different temperature mediums.

4. The integrated power generation system of claim 3, wherein, The fins (20) are arranged obliquely.

5. The integrated power generation system of claim 4, wherein, The fins (20) abut to the adjacent heat exchange plates (19).

6. The integrated power generation system of claim 3, wherein, The heat exchange plates (19) have four, and together with the shell (18) form five channels.

Images