Cross-seasonal passive cold storage efficient power generation system

Abstract

The utility model relates to the technical field of energy-saving power generation, and discloses a cross-seasonal passive cold storage efficient power generation system which comprises an ORC power generation unit, a heating unit and a cooling unit. The ORC power generation unit comprises a power generation circulation loop for circulating a power generation working medium; the heating unit is in heat exchange connection with the ORC power generation unit; the cooling unit comprises an underground cooling unit, the underground cooling unit comprises an underground cold storage structure and a heat exchange assembly, when the outdoor environment temperature is lower than a set value, the underground cold storage structure is suitable for exchanging heat with the external environment through the heat exchange assembly and storing cold energy, and when the outdoor environment temperature is higher than the set value, the underground cooling unit is in heat exchange connection with the ORC power generation unit. According to the embodiment of the utility model, natural cold energy across seasons in winter is guided into the ground through the heat exchange assembly to serve as a natural cold source, the cold energy is stored through the underground cold storage structure, and the cold energy serves as a cooling device of the ORC power generation unit in summer, so that the temperature difference between the cold source and the heat source is increased, and the power generation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy-saving power generation, and particularly relates to a cross-seasonal passive cold storage and high-efficiency power generation system. Background Art

[0002] From the perspective of energy utilization, most of the existing cross-seasonal energy storage technologies only utilize natural cooling capacity, and a small number of technologies utilize off-peak price cold storage, but the utilization rate of renewable energy is extremely low. Moreover, the existing cross-seasonal energy storage systems mainly focus on cold storage and refrigeration utilization. Generally, cold storage boxes or buried pipe cold storage are used, which have limited cold storage capacity, low cold storage density, large floor area, and no change in energy quality, resulting in low energy utilization rate. Content of the Utility Model

[0003] In view of this, the utility model provides a cross-seasonal passive cold storage and high-efficiency power generation system to solve the problem of low energy utilization rate of cross-seasonal energy storage technology.

[0004] The utility model provides a cross-seasonal passive cold storage and high-efficiency power generation system, which includes an ORC power generation unit, a heating unit, and a cooling unit. The ORC power generation unit includes a power generation circulation loop for circulating a power generation working medium; the heating unit is heat exchange-connected with the ORC power generation unit and is used to heat the power generation working medium before power generation; the cooling unit includes an underground cooling unit, and the underground cooling unit includes an underground cold storage structure and a heat exchange component. When the outdoor ambient temperature is lower than a set value, the underground cold storage structure is adapted to exchange heat with the external environment through the heat exchange component to store cold, and when the outdoor ambient temperature is higher than the set value, the underground cooling unit is heat exchange-connected with the ORC power generation unit and is used to cool the power generation working medium after power generation.

[0005] In an optional embodiment, the heat exchange component includes a plurality of vertically arranged one-way gravity heat pipes. The lower ends of the one-way gravity heat pipes extend into the interior of the underground cold storage structure, and the upper ends of the one-way gravity heat pipes extend above the ground. The one-way gravity heat pipes are used to circulate a low-boiling-point phase change working medium.

[0006] In an optional embodiment, the heat exchange component further includes a plurality of heat exchange fins, and the heat exchange fins are arranged at the top end and / or the bottom end of the one-way gravity heat pipe.

[0007] In an optional embodiment, the underground cold storage structure includes an underground energy storage water body.

[0008] In an optional embodiment, the cooling unit further includes an air cooling unit and a reversing valve group. The reversing valve group selectively connects the air cooling unit or the underground cooling unit to the ORC power generation unit in a heat exchangeable manner; when the outdoor ambient temperature is lower than the set value, the air cooling unit is heat exchange-connected with the ORC power generation unit.

[0009] In an alternative embodiment, the ORC power generation unit further includes a steam turbine, a circulation pump, and a generator. The steam turbine and the circulation pump are both arranged in the power generation circulation loop, and the generator is drivingly connected to the steam turbine.

[0010] In an alternative embodiment, the power generation circulation loop includes a first circulation section above the ground and a second circulation section below the ground; the first circulation section is heat-exchangeably connected to the air cooling unit, and the second circulation section extends into the underground cold storage structure, and the second circulation section is in heat-exchange connection with the underground cold storage structure.

[0011] In an alternative embodiment, the reversing valve group includes a first three-way valve downstream of the steam turbine and a second three-way valve upstream of the steam turbine. The first three-way valve and the second three-way valve are controllably connected through a reversing pipeline; when the first three-way valve and the second three-way valve are connected, the first circulation section forms a circulation loop, and the first circulation section and the second circulation section are disconnected; when the first three-way valve and the second three-way valve are disconnected, the first circulation section and the second circulation section are connected to form a circulation loop.

[0012] In an alternative embodiment, the air cooling unit includes an air cooler and a first heat exchange pipeline connecting the medium inlet and the medium outlet of the air cooler. The first heat exchange pipeline is in heat-exchange connection with the power generation circulation loop for cooling the working medium after power generation.

[0013] In an alternative embodiment, the heating unit includes a solar collector and a second heat exchange pipeline connecting the medium inlet and the medium outlet of the solar collector. The second heat exchange pipeline is in heat-exchange connection with the power generation circulation loop for heating the working medium before power generation.

[0014] Beneficial effects: The embodiment of the present utility model adopts a passive cold storage design, imports the natural cold quantity in winter across seasons into the ground through a heat exchange component as a natural cold source, stores the cold quantity through an underground cold storage structure, and uses it as a cooling device for the ORC power generation unit in summer, increasing the temperature difference between the cold and heat sources of the ORC power generation unit, improving the power generation efficiency of the ORC power generation unit, and having lower cold storage costs and higher safety. Description of the Drawings

[0015] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic structural diagram of a cross-season passive cold storage and high-efficiency power generation system according to an embodiment of the present utility model.

[0017] Description of Reference Numerals

[0018] 10. Power generation cycle loop; 11. Steam turbine; 12. Circulation pump; 13. Generator; 14. First stop valve; 21. Solar collector; 22. Second heat exchange pipeline; 31. Underground cooling unit; 311. Underground cold storage structure; 312. Heat exchange component; 3121. Unidirectional gravity heat pipe; 3122. Heat exchange fin; 32. Air cooling unit; 321. Air cooler; 322. First heat exchange pipeline; 323. Second stop valve; 33. Commutation valve group; 331. First three-way valve; 332. Second three-way valve; 40. Electricity user. Detailed Embodiment

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] The following will be combined with Figure 1 , to describe the embodiments of the present utility model.

[0021] According to an embodiment of the present utility model, a cross-season passive cold storage high-efficiency power generation system is provided, including an ORC power generation unit, a heating unit and a cooling unit. The ORC power generation unit includes a power generation cycle loop 10 for circulating a power generation working medium; the heating unit and the ORC power generation unit are heat exchange connected; the cooling unit includes an underground cooling unit 31, and the underground cooling unit 31 includes an underground cold storage structure 311 and a heat exchange component 312. When the outdoor ambient temperature is lower than a set value, the underground cold storage structure 311 is adapted to exchange heat with the external environment through the heat exchange component 312 to store cold energy, and when the outdoor ambient temperature is higher than the set value, the underground cooling unit 31 and the ORC power generation unit are heat exchange connected.

[0022] The cross-season passive cold storage high-efficiency power generation system provided by the present utility model can realize power generation by setting up an ORC power generation unit. Since the power generation cycle loop 10 in the ORC power generation unit is heat exchange connected to the heating unit, the power generation working medium flowing in the power generation cycle loop 10 evaporates into a gas state under the heating of the heating unit and does work to generate electricity. Also, since the power generation cycle loop 10 in the ORC power generation unit is heat exchange connected to the cooling unit, the exhausted steam after doing work is cooled to a liquid state by the cooling unit to complete a power generation cycle. The liquid power generation working medium is heated, does work to generate electricity, and is cooled again, thus forming a power generation cycle.

[0023] In the embodiment of the present utility model, a passive cold storage design is adopted. The natural cold in winter is introduced underground through the heat exchange component 312 as a natural cold source, and the cold is stored through the underground cold storage structure 311. In summer, it is used as a cooling device for the ORC power generation unit, increasing the temperature difference between the cold and heat sources of the ORC power generation unit, improving the power generation efficiency of the ORC power generation unit, and having a relatively low cold storage cost and high safety.

[0024] In some embodiments, the heat exchange component 312 includes a plurality of vertically arranged one-way gravity heat pipes 3121. The lower end of the one-way gravity heat pipe 3121 extends into the underground cold storage structure 311, and the upper end of the one-way gravity heat pipe 3121 extends above the ground. The one-way gravity heat pipe 3121 is used to circulate a low-boiling-point phase change working fluid.

[0025] By adopting the one-way gravity heat pipe 3121, part of which extends underground and part of which is exposed above the ground, the cold in the environment can be stored underground by using the one-way gravity heat pipe 3121. Specifically, the low-boiling-point phase change working fluid flowing in the one-way gravity heat pipe 3121 is in a liquid state underground and absorbs the heat underground. The low-boiling-point phase change working fluid is heated and evaporated into a gas state, rising along the one-way gravity heat pipe 3121 to the ground. Since the environmental temperature in winter is relatively low, the gaseous low-boiling-point phase change working fluid is condensed into a liquid state again and flows back to the underground along the one-way gravity heat pipe 3121. In this way, the cycle repeats, continuously storing the cold in the winter environmental temperature underground and taking it in summer to achieve cross-seasonal passive cold storage.

[0026] In some embodiments, the heat exchange component 312 further includes a number of heat exchange fins 3122, and the heat exchange fins 3122 are arranged at the top end and / or the bottom end of the one-way gravity heat pipe 3121.

[0027] By arranging the heat exchange fins 3122 on the one-way gravity heat pipe 3121, the heat exchange effect can be enhanced. As Figure 1 shown, in this embodiment, a number of heat exchange fins 3122 are arranged at both the top end and the bottom end of the one-way gravity heat pipe 3121, which can enhance the heat exchange effect on the ground and underground.

[0028] In some embodiments, the underground cold storage structure 311 includes an underground energy storage water body.

[0029] By using the underground energy storage water body, the natural energy storage resources can be directly utilized, and the economy is high.

[0030] In some embodiments, the underground energy storage water body includes cavity fissure water.

[0031] When the underground energy storage water body adopts cavity fissure water, it can ensure that the stored cold does not dissipate.

[0032] In some embodiments, the cooling unit further includes an air cooling unit 32 and a reversing valve group 33. The reversing valve group 33 selectively and heat-exchangeably connects the air cooling unit 32 or the underground cooling unit 31 to the ORC power generation unit. When the outdoor ambient temperature is lower than a set value, the air cooling unit 32 is heat-exchangeably connected to the ORC power generation unit.

[0033] In the cross-seasonal passive cold storage and high-efficiency power generation system provided by the embodiment of the present utility model, since the cooling unit includes an air cooling unit 32 and an underground cooling unit 31, that is, the working fluid in the power generation cycle loop 10 after doing work can be cooled by either the air cooling unit 32 or the underground cooling unit 31. Through the reversing valve group 33, one of them can be selected as the cold source to cool the working fluid after doing work. Generally speaking, due to the relatively low ambient temperature in winter, the air cooler 321 can directly cool the working fluid after doing work in winter. At the same time, due to the relatively low ambient temperature in winter, the cold energy in the environment can be stored in the underground cold storage structure 311 by using the heat exchange component 312 to realize the storage of cold energy. In this way, in summer, by using the reversing valve group 33, the air cooling unit 32 is closed and the underground cooling unit 31 is opened to cool the working fluid after doing work.

[0034] The present utility model converts low-grade cold energy into high-grade electric energy, improving the energy utilization rate. And regardless of winter or summer, the cold and heat sources of the ORC power generation unit are in large temperature difference operation, which can ensure the high-efficiency power generation of the power generation system throughout the year. The cost of passive cold storage is relatively low, and the economy of the ORC power generation unit is relatively high, having the value of large-scale popularization.

[0035] Specifically, for winter and summer, there are differences in seasonal temperatures in different regions, and the cold source can be selected according to the set temperature. When the outdoor ambient temperature is lower than the set value, the air cooling unit 32 is heat-exchangeably connected to the ORC power generation unit. When the outdoor ambient temperature is higher than the set value, the underground cooling unit 31 is heat-exchangeably connected to the ORC power generation unit.

[0036] In some embodiments, the ORC power generation unit further includes a steam turbine 11, a circulation pump 12, and a generator 13. The steam turbine 11 and the circulation pump 12 are both arranged in the power generation cycle loop 10, and the generator 13 is drivingly connected to the steam turbine 11.

[0037] By setting the circulation pump 12, the circulation of the working fluid in the power generation cycle loop 10 can be realized. By setting the steam turbine 11 and the generator 13 and drivingly connecting the two, in this way, the steam turbine 11 does work to drive the generator 13 to generate electricity, so as to supply power to users. Specifically, the heating unit is heat-exchangeably connected to the power generation cycle loop 10, and the cooling unit is heat-exchangeably connected to the power generation cycle loop 10. The generator 13 supplies the electric quantity to the power user 40 through a power line.

[0038] In some embodiments, the power generation cycle loop 10 includes a first flow section above the ground and a second flow section below the ground; the first flow section is heat-exchangeably connected to the air cooling unit 32, and the second flow section extends into the underground cold storage structure 311 and is in heat-exchange connection with the underground cold storage structure 311.

[0039] Specifically, the first flow section is above the ground and can exchange heat with the air cooling unit 32 also above the ground in winter. The second flow section is below the ground and can exchange heat with the underground cooling unit 31 also below the ground in summer. The second flow section extends into the underground cold storage structure 311 and is in heat-exchange connection with the underground cold storage structure 311. In this way, the exhaust steam after the steam turbine 11 does work can fully exchange heat with the underground cooling unit 31.

[0040] In some embodiments, the reversing valve group 33 includes a first three-way valve 331 downstream of the steam turbine 11 and a second three-way valve 332 upstream of the steam turbine 11. The first three-way valve 331 and the second three-way valve 332 are controllably connected through a reversing pipeline; when the first three-way valve 331 and the second three-way valve 332 are connected, the first flow section forms a cycle loop, and the first flow section and the second flow section are disconnected; when the first three-way valve 331 and the second three-way valve 332 are disconnected, the first flow section and the second flow section are connected to form a cycle loop.

[0041] By providing the first three-way valve 331 and the second three-way valve 332, in winter, control the first three-way valve 331 and the second three-way valve 332 to connect them, so that the first three-way valve 331 and the second three-way valve 332 form a cycle loop. At this time, the second flow section and the first flow section are disconnected. In this way, the air cooling unit 32 can be used to cool the power generation working fluid after doing work. In summer, control the first three-way valve 331 and the second three-way valve 332 to connect the first flow section and the second flow section. At this time, the underground cooling unit 31 can be used to cool down the power generation working fluid after doing work.

[0042] Furthermore, when switching the cooling unit during the season change, in order to further accurately control the flow direction of the power generation working fluid in the power generation cycle loop 10, a first stop valve 14 is provided upstream of the second flow section located underground. The first stop valve 14 is closed in winter and opened in summer.

[0043] In some embodiments, the air cooling unit 32 includes an air cooler 321 and a first heat exchange pipeline 322 that connects the medium inlet and the medium outlet of the air cooler 321. The first heat exchange pipeline 322 is in heat-exchange connection with the power generation cycle loop 10 and is used to cool the power generation working fluid after power generation.

[0044] Specifically, the first heat exchange pipeline 322 is heat exchange connected to the circulation section between the downstream of the steam turbine 11 and the ground in the power generation cycle loop 10. In this way, the exhausted steam flowing out after the steam turbine 11 does work can be cooled.

[0045] Further, a second stop valve 323 is provided on the second heat exchange pipeline 22. In winter, the second stop valve 323 is opened and the first stop valve 14 is closed, and the air cooling unit 32 is used to cool the medium after power generation.

[0046] In some embodiments, the heating unit includes a solar collector 21 and a second heat exchange pipeline 22 communicating with the medium inlet and the medium outlet of the solar collector 21. The second heat exchange pipeline 22 is heat exchange connected to the power generation cycle loop 10 and is used to heat the working medium before power generation.

[0047] Specifically, the solar collector 21 can collect solar heat and heat the working medium flowing into the steam turbine 11 through the second heat exchange pipeline 22, increasing the work temperature difference of the steam turbine 11 and improving the power generation efficiency.

[0048] Specifically, the working medium includes an organic working medium.

[0049] Refer to Figure 1 , for the cross-seasonal passive cold storage high-efficiency power generation system provided by the embodiment of the present invention, the ORC power generation unit uses a large slip temperature difference organic working medium, and the solar collector 21 provides a heat source for the ORC power generation unit, causing the organic working medium to evaporate into a gas and enter the steam turbine 11 to do work and generate electricity.

[0050] In summer, the high ambient temperature is not conducive to cooling. In summer, the exhausted steam after doing work enters the underground cooling unit 31 through the first three-way valve. The cold stored in winter is transferred to the exhausted steam to cool it down. The organic working medium after cooling can be completely changed into a liquid working medium, and then enters the solar collector 21 through the circulation pump 12 for heating and evaporation to complete the power generation cycle.

[0051] In winter, the ambient temperature is relatively low. In winter, the exhausted steam after the steam turbine 11 does work can enter the air cooling unit 32 by opening the first stop valve 14, and at the same time, the first three-way valve 331 and the second three-way valve 332 are opened. The cold of the environment is used to cool the exhausted steam. The cooled organic working medium becomes completely liquid, and through the circulation of the circulation pump 12, it is heated and evaporated by the solar collector 21 before reaching the steam turbine 11, and then enters the steam turbine 11 to generate electricity to complete the power generation cycle. The electricity generated by the generator 13 is supplied to the power user 40 through the power line.

[0052] Although embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A multi-season passive cold storage and high-efficiency power generation system, characterized in that: include: An ORC power generation unit, the ORC power generation unit comprising a power generation circulation loop (10) for circulating a power generation medium; A heating unit, the heating unit is connected to the ORC power generation unit for heat exchange, and is used to heat the power generation medium before power generation; A cooling unit, the cooling unit comprising an underground cooling unit (31), the underground cooling unit (31) comprising an underground cold storage structure (311) and a heat exchange component (312), when the outdoor environment temperature is lower than a set value, the underground cold storage structure (311) is suitable for exchanging heat with the external environment through the heat exchange component (312) to store cold energy, and when the outdoor environment temperature is higher than the set value, the underground cooling unit (31) is connected to the ORC power generation unit for heat exchange to cool the power generation medium after power generation.

2. The cross-season passive cold storage and high-efficiency power generation system according to claim 1 is characterized in that: The heat exchange component (312) comprises a plurality of vertically arranged unidirectional gravity heat pipes (3121), the lower ends of the unidirectional gravity heat pipes (3121) extending into the interior of the underground cold storage structure (311), and the upper ends of the unidirectional gravity heat pipes (3121) extending above the ground, and the unidirectional gravity heat pipes (3121) are used to circulate a low-boiling-point phase-change working fluid.

3. The cross-season passive cold storage and high-efficiency power generation system according to claim 2 is characterized in that: The heat exchange component (312) further comprises a plurality of heat exchange fins (3122), wherein the heat exchange fins (3122) are arranged at the top end of the unidirectional gravity heat pipe (3121) and / or the bottom end of the unidirectional gravity heat pipe (3121).

4. The multi-season passive cold storage and high-efficiency power generation system according to any one of claims 1 to 3, characterized in that: The underground cold storage structure (311) includes an underground energy storage water body.

5. The multi-season passive cold storage and high-efficiency power generation system according to any one of claims 1 to 3, characterized in that: The cooling unit further comprises an air cooling unit (32) and a reversing valve group (33), wherein the reversing valve group (33) selectively connects the air cooling unit (32) or the underground cooling unit (31) to the ORC power generation unit in a heat exchangeable manner; when the outdoor ambient temperature is lower than a set value, the air cooling unit (32) and the ORC power generation unit are heat exchangeably connected.

6. The cross-season passive cold storage and high-efficiency power generation system according to claim 5 is characterized in that: The ORC power generation unit further comprises a steam turbine (11), a circulation pump (12) and a generator (13); the steam turbine (11) and the circulation pump (12) are both arranged in the power generation circulation loop (10); and the generator (13) is drivingly connected to the steam turbine (11).

7. The cross-season passive cold storage and high-efficiency power generation system according to claim 6 is characterized in that: The power generation circulation loop (10) comprises a first flow section located above the ground and a second flow section located below the ground; the first flow section and the air cooling unit (32) are heat exchangeably connected, and the second flow section extends into the underground cold storage structure (311), and the second flow section is heat exchangeably connected to the underground cold storage structure (311).

8. The cross-season passive cold storage and high-efficiency power generation system according to claim 7 is characterized in that: The reversing valve group (33) comprises a first three-way valve (331) located downstream of the steam turbine (11) and a second three-way valve (332) located upstream of the steam turbine (11), wherein the first three-way valve (331) and the second three-way valve (332) are controllably connected via a reversing pipeline; When the first three-way valve (331) and the second three-way valve (332) are connected, the first flow section forms a circulation loop, and the first flow section and the second flow section are disconnected; When the first three-way valve (331) and the second three-way valve (332) are disconnected, the first flow section and the second flow section are connected to form a circulation loop.

9. The multi-season passive cold storage and high-efficiency power generation system according to claim 5 is characterized in that: The air cooling unit (32) comprises an air cooler (321) and a first heat exchange pipeline (322) connecting a medium inlet and a medium outlet of the air cooler (321); the first heat exchange pipeline (322) is connected to the power generation circulation loop (10) for heat exchange, and is used to cool the power generation medium after power generation.

10. The multi-season passive cold storage and high-efficiency power generation system according to any one of claims 1 to 3, characterized in that: The heating unit comprises a solar thermal collector (21) and a second heat exchange pipeline (22) connected to a medium inlet and a medium outlet of the solar thermal collector (21); the second heat exchange pipeline (22) is connected to the power generation circulation loop (10) for heat exchange and is used to heat the power generation medium before power generation.

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