Coupling energy storage hot dry rock-solar energy combined power generation system

Abstract

The utility model relates to a coupling energy storage hot dry rock-solar energy combined power generation system, geothermal water of a hot dry rock well enters a power generation unit after being regulated and controlled by an intelligent regulation and control device, an organic working medium of the power generation unit exchanges heat with geothermal water of a heat source unit and then generates power, and an organic working medium of the power generation unit exchanges heat with cooling water of a cooling unit; according to the geothermal water temperature of the hot dry rock well, it is judged that the hot dry rock-solar reheating peak shaving unit or the hot dry rock-solar coupling energy storage unit is started; the hot dry rock-solar reheating peak shaving unit controls terrestrial heat return water to enter the solar panel A to be heated again, and the hot dry rock-solar coupling energy storage unit controls terrestrial heat outlet water to enter the solar panel B and the energy storage device; the flow entering the evaporator from the heat source unit side is regulated and controlled according to the electricity demand of a user, and dynamic power generation is achieved. The system is simple in composition, small in initial investment, good in economical efficiency and capable of greatly improving the utilization rate and the application range of hot dry rock resources.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the renewable resource development and utilization technical field, specifically relates to a dry hot rock-solar combined power generation system of coupling energy storage. BACKGROUND

[0002] In recent years, under the double carbon target, renewable energy has been widely promoted and utilized, and geothermal energy has become an important alternative to traditional fossil energy due to its large reserves, wide distribution and strong stability. As a kind of geothermal energy resource, dry hot rock has high temperature, sustainable energy supply and wide application range, and has been widely valued by the international community. The existing development and utilization mode of dry hot rock resources mainly includes enhanced geothermal system (CN205939792U) and closed cycle heat extraction system (CN110863800A). The former creates an artificial heat reservoir by means of large-scale fracturing to obtain fissures, and the heat extraction medium enters the fissure reservoir through the injection well, exchanges heat with the rock, and then flows out through the production well to enter the ground utilization system. Not only is the investment high, but also there is a serious loss of heat extraction medium, low recovery rate, and easy to induce geological disasters such as earthquakes; the latter installs a coaxial casing in the dry hot rock well, and the heat extraction medium extracts heat from the heat reservoir through a closed circulation system. When running for a long time, there is a defect of insufficient heat supply, which cannot meet the heat load demand during the peak of electricity consumption, limiting the popularization and application of dry hot rock resources. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at overcoming the defects of the prior art, providing a dry hot rock-solar combined power generation system of coupling energy storage, improving the utilization rate of dry hot rock resources, breaking through the application limitations of dry hot rock caused by the decay of heat extraction capacity, and giving two operation schemes of dry hot rock-solar reheat peak shaving and dry hot rock-solar coupling energy storage for the two cases of good initial temperature conditions and long-period running temperature condition decay of dry hot rock heat extraction system. The system can not only make full use of the heat in the tail water after high-temperature dry hot rock power generation, but also use solar energy to heat low-temperature dry hot rock resources to the required temperature of the power generation system, thereby avoiding the problem of insufficient heat caused by the decay of dry hot rock heat supply capacity under long-time operation. At the same time, the system is coupled with an energy storage device, which can fully utilize the difference between peak and valley electricity prices, reduce the pump power of the system, reduce the operation cost of the system, and further improve the economy of the power generation system.

[0004] The utility model solves its technical problems by the following technical scheme:

[0005] The utility model relates to a dry hot rock-solar combined power generation system of coupling energy storage, including heat source unit, power generation unit and cooling unit, the heat source unit includes dry hot rock well, geothermal water circulating pump, intelligent control device, heat source side circulating pump connected in proper order, the geothermal water of dry hot rock well enters power generation unit after the control of intelligent control device, the organic working medium of power generation unit and the geothermal water of heat source unit heat exchange and carry out power generation after, the organic working medium of power generation unit and the cooling water of cooling unit heat exchange and carry out cooling.

[0006] Moreover, the heat source unit further comprises a dry hot rock-solar reheating peak regulation unit and a dry hot rock-solar coupling energy storage unit, the dry hot rock-solar reheating peak regulation unit is installed on the return water pipeline of the dry hot rock well, and the dry hot rock-solar coupling energy storage unit is installed on the water outlet pipeline of the dry hot rock well.

[0007] The dry hot rock-solar coupling energy storage unit comprises a solar panel B, a solar circulating pump B and an energy storage device, the solar panel B and the solar circulating pump B are arranged in parallel with the energy storage device, part of the geothermal water of the dry hot rock well flows into the energy storage device, and the other part of the geothermal water is heated by the solar panel B, mixed with the geothermal water in the energy storage device through the solar circulating pump B, enters the intelligent control device under the adjustment of the intelligent control device, and enters the power generation unit to generate power.

[0008] Moreover, the power generation unit comprises an evaporator, a compressor, a generator and a condenser, the organic working medium of the generator is heat-exchanged with the evaporator through a working medium pump, the organic working medium that is sufficiently heated in the evaporator enters the compressor, and the generator is driven to complete power generation after being pressurized.

[0009] Moreover, the cooling unit comprises a cooling tower and a cooling water circulating pump, the organic working medium after power generation flows through the condenser, is heat-exchanged with the cooling water in the cooling tower under the action of the cooling water circulating pump, and the organic working medium after heat release enters the evaporator again to circulate.

[0010] Moreover, the organic working medium of the power generation unit is R134a or R245fa.

[0011] The utility model can produce the positive effect:

[0012] 1. The dry hot rock-solar combined power generation system of the present application can make full use of the heat in the tail water after high-temperature dry hot rock power generation, and can use solar energy to heat low-temperature dry hot rock resources to the required temperature of the power generation system, thereby avoiding the problem of insufficient heat caused by the attenuation of the dry hot rock heating capacity under long-period operation.

[0013] 2. The dry hot rock-solar combined power generation system of the present application couples an energy storage device in the system, can make full use of the difference between peak and valley electricity prices, reduce system pump power, reduce the operation cost of the system, and further improve the economy of the power generation system.

[0014] 3. The dry hot rock-solar combined power generation system of the present application gives an intelligent control strategy for the system during operation, can dynamically adjust the heat source flow entering the power generation system in real time according to the heating capacity of solar energy and dry hot rock resources and the electricity demand of users, and can effectively improve the efficiency of the power generation system.

[0015] 4. The dry hot rock-solar combined power generation system of the present application overcomes the defects of unstable solar energy resource conditions and attenuation of dry hot rock heating capacity under long-period operation, cleverly complements two kinds of renewable energy, and improves the utilization rate of renewable resources. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the power generation system of the present application;

[0017] Figure 2 is a schematic diagram of the dry hot rock-solar reheating peak shaving unit of the present application;

[0018] Figure 3 is a schematic diagram of the dry hot rock-solar coupling energy storage unit of the present application.

[0019] BRIEF DESCRIPTION OF DRAWINGS

[0020] 1. dry hot rock well 2, geothermal water circulating pump 3, intelligent control device 4, heat source side circulating pump 5, evaporator 6, solar panel A 7, solar circulating pump A 8, solar panel B 9, solar circulating pump B, 10, energy storage device 11, working medium pump 12, compressor 13, generator 14, condenser 15, cooling water circulating pump 16, cooling tower. DETAILED DESCRIPTION

[0021] The present application will be further described in detail through specific embodiments below, and the following embodiments are only descriptive and not limiting, and cannot limit the protection scope of the present application.

[0022] As Figure 1As shown in the figure, a dry hot rock-solar combined power generation system with energy storage, which is characterized in that: comprising a heat source unit, a power generation unit and a cooling unit, the heat source unit comprises a dry hot rock well 1, a geothermal water circulating pump 2, an intelligent control device 3 and a heat source side circulating pump 4 connected in sequence, the geothermal water of the dry hot rock well 1 enters the power generation unit after being regulated by the intelligent control device 3, the organic working medium of the power generation unit exchanges heat with the geothermal water of the heat source unit, and then generates power, and the organic working medium of the power generation unit exchanges heat with the cooling water of the cooling unit to be cooled.

[0023] As shown in the figure, Figure 2 , 3 As shown in the figure, the heat source unit further comprises a dry hot rock-solar reheating peak shaving unit and a dry hot rock-solar coupled energy storage unit, the dry hot rock-solar reheating peak shaving unit is installed on the return water pipeline of the dry hot rock well 1, and the dry hot rock-solar coupled energy storage unit is installed on the water outlet pipeline of the dry hot rock well 1, the dry hot rock-solar reheating peak shaving unit comprises a solar panel A6 and a solar circulating pump A7 connected in sequence, the geothermal water after heat exchange with the power generation unit is heated again by the solar panel A6, then mixed with the geothermal water on the water outlet pipeline of the dry hot rock well 1 by the solar circulating pump A7, enters the intelligent control device 3 under the regulation of the intelligent control device 3, and generates power again in the power generation unit;

[0024] The dry hot rock-solar coupled energy storage unit comprises a solar panel B8, a solar circulating pump B9 and an energy storage device 10, the solar panel B8 and the solar circulating pump B9 are arranged in parallel with the energy storage device 10, part of the geothermal water of the dry hot rock well 1 flows into the energy storage device 10, and the other part is heated by the solar panel B8, then mixed with the geothermal water in the energy storage device 10 by the solar circulating pump B9, enters the intelligent control device 3 under the regulation of the intelligent control device 3, and generates power in the power generation unit.

[0025] The power generation unit comprises an evaporator 5, a compressor 12, a generator 13 and a condenser 14, the organic working medium of the generator 13 exchanges heat with the evaporator 5 through a working medium pump 11, the organic working medium fully absorbing heat in the evaporator 5 enters the compressor 12, and after being pressurized, drives the generator 13 to complete power generation.

[0026] The cooling unit comprises a cooling tower 16 and a cooling water circulating pump 15, the organic working medium after power generation flows through the condenser 14, exchanges heat with the cooling water in the cooling tower 16 under the action of the cooling water circulating pump 15, and then enters the evaporator 5 again to circulate.

[0027] The organic working medium of the power generation unit is R134a or R245fa.

[0028] The working principle of the utility model is:

[0029] When the dry hot rock water temperature condition is good (≥80℃), the dry hot rock-solar reheat peak shaving unit is started, the geothermal water in the dry hot rock well 1 is fully heat-absorbed, under the action of the geothermal water circulating pump 2, the intelligent control device 3, according to the power load demand of the heat user, adjusts the power of the heat source side circulating pump 4 to control the geothermal water flow into the evaporator 5, after fully heat-exchanged with the organic working medium of the power generation unit in the evaporator 5, part of the geothermal water directly enters the dry hot rock well 1 to absorb heat again, another part enters the solar panel A 6, after heated again in the solar panel A 6, enters the intelligent control device 3 through the solar circulating pump A 7, mixes with the geothermal water and enters the power generation unit again; the organic working medium fully heat-absorbed in the evaporator 5 enters the compressor 12 under the action of the working medium pump 11, after pressure increasing, drives the generator 13 to complete the power generation process; the power generated organic working medium flows through the condenser 14, exchanges heat with the cooling water in the cooling tower 16 under the action of the cooling water circulating pump 15, the heat released organic working medium enters the evaporator 5 again, and sequentially circulates;

[0030] When the dry hot rock water temperature condition is poor (<80℃), the dry hot rock-solar coupling energy storage unit is started, when the geothermal water fully heat-absorbed in the dry hot rock well 1 flows out of the well mouth of the dry hot rock well 1, part of the geothermal water flows through the geothermal water circulating pump 2 and enters the energy storage device 10, another part enters the solar panel B 8 to heat to the high temperature required by the power generation unit, mixes with the geothermal water in the energy storage device 10 after mixing and enters the intelligent control device 3, according to the power load demand of the heat user, the intelligent control device 3 adjusts the power of the heat source side circulating pump 4 to control the geothermal water flow into the evaporator 5, after fully heat-exchanged with the organic working medium of the power generation unit in the evaporator 5, the geothermal water flows back to the dry hot rock well to absorb heat again; the organic working medium fully heat-absorbed in the evaporator 5 enters the compressor 12 under the action of the working medium pump 11, after pressure increasing, drives the generator 13 to complete the power generation process; the power generated organic working medium flows through the condenser 14, exchanges heat with the cooling water in the cooling tower 16 under the action of the cooling water circulating pump 15, the heat released organic working medium enters the evaporator 5 again, and sequentially circulates.

[0031] Although the embodiments and drawings of the utility model are disclosed for the purpose of illustration, those skilled in the art can understand that various substitutions, changes and modifications are possible without departing from the spirit and scope of the utility model and the appended claims, therefore, the scope of the utility model is not limited to the content disclosed in the embodiments and drawings.

Claims

1. A coupled energy storage hot dry rock-solar hybrid power system, characterized by: The heat source unit, the power generation unit and the cooling unit, the heat source unit comprises dry hot rock well (1), geothermal water circulating pump (2), intelligent control device (3), heat source side circulating pump (4) connected in sequence, the geothermal water of dry hot rock well (1) is regulated after entering the power generation unit by intelligent control device (3), the organic working medium of power generation unit and the geothermal water of heat source unit heat exchange and carry out power generation, the organic working medium of power generation unit and the cooling water of cooling unit heat exchange and carry out cooling.

2. The coupled energy storage hot-dry-rock-solar hybrid power system of claim 1, wherein: The heat source unit further comprises dry hot rock-solar reheating peak shaving unit and dry hot rock-solar coupled energy storage unit, the dry hot rock-solar reheating peak shaving unit is installed on the return water pipeline of dry hot rock well (1), the dry hot rock-solar coupled energy storage unit is installed on the water outlet pipeline of dry hot rock well (1), the dry hot rock-solar reheating peak shaving unit comprises solar panel A (6) and solar circulating pump A (7) connected in sequence, the geothermal water after heat exchange with power generation unit is heated again by solar panel A (6) and then mixed with the geothermal water on the water outlet pipeline of dry hot rock well (1) by solar circulating pump A (7) and enters intelligent control device (3), under the regulation of intelligent control device (3), it enters power generation unit to carry out power generation again. The dry hot rock-solar coupled energy storage unit comprises solar panel B (8), solar circulating pump B (9) and energy storage device (10), the solar panel B (8) and solar circulating pump B (9) are connected in parallel with energy storage device (10), part of the geothermal water of dry hot rock well (1) flows into energy storage device (10), another part is heated by solar panel B (8) and then mixed with the geothermal water in energy storage device (10) by solar circulating pump B (9) and enters intelligent control device (3), under the regulation of intelligent control device (3), it enters power generation unit to carry out power generation.

3. The coupled energy storage hot-dry rock-solar hybrid power system of claim 1, wherein: The power generation unit comprises evaporator (5), compressor (12), generator (13) and condenser (14), the organic working medium of generator (13) exchanges heat with evaporator (5) through working medium pump (11), the organic working medium fully absorbing heat in evaporator (5) enters compressor (12), and the generator (13) is driven to complete power generation after being pressurized.

4. The coupled energy storage hot-dry rock-solar hybrid power system of claim 1, wherein: The cooling unit comprises cooling tower (16) and cooling water circulating pump (15), the organic working medium after power generation flows through condenser (14) and exchanges heat with cooling water in cooling tower (16) under the action of cooling water circulating pump (15), and the organic working medium after heat release enters evaporator (5) again to circulate.

5. The coupled energy storage hot-dry rock-solar hybrid power system of claim 1, wherein: The organic working medium of power generation unit is R134a or R245fa.

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