CN210345939U - Deep well geothermal power generation, heat storage and heat supply system for power grid peak shaving - Google Patents
Deep well geothermal power generation, heat storage and heat supply system for power grid peak shaving Download PDFInfo
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- CN210345939U CN210345939U CN201920738752.6U CN201920738752U CN210345939U CN 210345939 U CN210345939 U CN 210345939U CN 201920738752 U CN201920738752 U CN 201920738752U CN 210345939 U CN210345939 U CN 210345939U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/40—Geothermal heat-pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
The utility model relates to a deep well geothermal power generation, heat-retaining and heating system for electric wire netting peak shaving, including well low temperature geothermal power generation device, well low temperature geothermal power generation device links to each other with geothermal production well, geothermol power recharging well through geothermal production well pipeline, geothermol power recharging well pipeline respectively, and well low temperature geothermal power generation device links to each other with the electric wire netting through network access circuit. The utility model discloses the unnecessary electric power of usable power supply valley period heats and with heat storage in the geothermal well through the high temperature heat pump, opens well low temperature geothermal power generation in power consumption peak period to improve well low temperature geothermal power generation power and increase the power supply capacity of electric wire netting in power consumption peak period, and need not set up heat-retaining system and buried pipe or heat source tower alone. The utility model discloses can realize different functions such as electricity generation, heat-retaining, heat supply at different price of electricity time interval control to the maximize utilizes geothermal resources.
Description
Technical Field
The utility model belongs to the technical field of the utilization of middle and deep layer geothermol power, a deep well geothermal power generation, heat-retaining and heating system for electric wire netting peak shaving is related to.
Background
The rapid development of the electric power, which is one of important energy sources, promotes the development of economy in China, and the development of the economy can influence the electric power industry. The phenomenon of power shortage at the peak of power utilization of the power grid happens occasionally, and the higher the economic development level is, the more practical and novel the problem is.
For solving the problem of peak-valley difference of power consumption, a thermal power generating unit with large installed capacity is generally adopted to solve the problem of large peak-valley difference through variable load operation. However, for a thermal power generating unit, if the thermal power generating unit is operated under a low-load working condition for a long time, the economy of the thermal power generating unit is greatly reduced, more pollutants are discharged, and a serious environmental problem is caused. If a hydroelectric power station is adopted for peak regulation, the problems of uneven water resource distribution, large long-distance transmission loss and the like are faced. And other modes such as compressed air energy storage have the problems of low energy density, large volume, high cost and the like. Aiming at the problems, the deep well geothermal power generation, heat storage and heat supply system for power grid peak regulation can be adopted to solve the problem of power grid peak regulation.
Geothermal energy is renewable energy from the deep of the earth, and in recent years, the development and utilization of geothermal energy in China are accelerated, and the effect is remarkable. The utilization of geothermal energy is mainly divided into two modes, the first mode is direct utilization of heat energy, and the first mode comprises a ground source heat pump, direct heat supply of geothermal water and the like; the second category is geothermal power generation.
Geothermal power generation is a novel power generation technology taking underground hot water and steam as power sources, the basic principle of the geothermal power generation is similar to that of thermal power generation, and the geothermal power generation firstly converts geothermal energy into mechanical energy and then converts the mechanical energy into electric energy according to an energy conversion principle. There are mainly 3 types of geothermal power generation systems: the system comprises a high-temperature dry steam power generation system, a capacity expansion flash evaporation power generation system and a double-working-medium circulating power generation system.
Compared with the traditional power generation mode, the geothermal power generation utilizes renewable geothermal resources, has no pollution and no emission in the operation process, and has positive effects on developing low-carbon economy and realizing sustainable development. Compared with renewable energy power generation such as wind power generation and solar photovoltaic power generation, geothermal power generation is very stable, is hardly influenced by external environment changes, and can be used as an effective means for power grid peak regulation.
Because high-temperature geothermal power generation is very dependent on actual geological conditions, and the geothermal resources which are proved in China are mainly medium-low temperature geothermal resources, the research on medium-low temperature geothermal power generation is rapidly increased in recent years. The medium-low temperature geothermal power generation mostly adopts an expansion flash evaporation power generation system or a double-working-medium circulation power generation system such as an organic Rankine cycle and a kalina cycle, and the influence of the heat source temperature on the overall performance of the power generation system is great. The university of Tianjin has best published 2014 a simulation and experimental research on absorption temperature rise Kalina power generation cycle of the Master thesis, in which the influence of heat source temperature on the Kalina cycle power generation system is researched, and through simulation calculation, when the heat source temperature rises from 90 ℃ to 140 ℃, the net power generation power of the system rises from about 800kW to about 2700kW, and is improved by 237.5%. The analysis and simulation of operation parameters of a geothermal energy organic Rankine cycle power generation system in Shuichi's paper published by Tianjin commercial university Zhang in 2015, wherein the influence of the heat source temperature on the organic Rankine cycle power generation system is researched, and through simulation calculation, when the heat source temperature is increased from 100 ℃ to 120 ℃ under the same superheat degree, the net output power of the system is increased from about 300kW to about 740kW, and is increased by about 146.7%.
The research shows that the influence of the heat source temperature on the medium-low temperature geothermal power generation system is obvious, and the geothermal power generation power can be effectively improved by increasing the heat source temperature. Therefore, if the surplus electric power in the power supply valley period is used for heating and stored in the geothermal production well, the medium-low temperature geothermal power generation system is started in the electricity utilization peak period, the heat source temperature and the geothermal power generation power can be improved, the power supply capacity of a power grid in the electricity utilization peak period can be increased, and the power supply stability is guaranteed.
Through a search for a patent publication, no patent publication that is the same as the present patent application is found.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a deep well geothermal power generation, heat-retaining and heating system for electric wire netting peak shaving. The system utilizes the redundant electric power in the valley period of power supply, heats through the high-temperature heat pump and stores heat in the middle-deep geothermal well, and starts the medium-low temperature geothermal power generation in the peak period of power consumption so as to improve the medium-low temperature geothermal power generation power, increase the power supply capacity of the power grid in the peak period of power consumption, and supply heat to the outside.
The utility model provides a its technical problem realize through following technical scheme:
a deep well geothermal power generation, heat-retaining and heating system for power grid peak shaving is characterized in that: the system comprises a medium-low temperature geothermal power generation device, wherein the medium-low temperature geothermal power generation device is respectively connected with a geothermal production well and a geothermal recharging well through a geothermal production well pipeline and a geothermal recharging well pipeline, and the medium-low temperature geothermal power generation device is connected with a power grid through an internet circuit.
And the geothermal production well is internally provided with a heat exchanger in the production well, and the heat exchanger in the production well is connected with the high-temperature heat pump through a pipeline at the side of the heat pump production well.
And a heat exchanger in the recharging well is arranged in the geothermal recharging well, and the heat exchanger in the recharging well is connected with the high-temperature heat pump through a pipeline on the side of the heat pump recharging well.
And the heat exchanger in the recharging well and the heat exchanger in the production well are U-shaped tubular or coaxial sleeve type closed heat exchangers.
Moreover, the high-temperature heat pump is provided with an external heat supply interface.
The utility model discloses an advantage and beneficial effect do:
1. the utility model discloses the unnecessary electric power of usable power supply valley period heats and with heat storage in the geothermal well through the high temperature heat pump, opens well low temperature geothermal power generation at power consumption peak period to improve well low temperature geothermal power generation power and increase the power supply capacity of electric wire netting at power consumption peak period.
2. The utility model discloses directly store the heat in the geothermal well, need not set up the heat-retaining system alone, saved investment and occupation of land space.
3. The utility model provides a fluid in the high temperature heat pump direct utilization geothermol power recharge well does not need to build alone buried pipe or heat source tower as the heat source, has saved investment and occupation of land space. In addition, since the geothermal tail water temperature is generally higher than the outdoor temperature, the heat pump system is more efficient.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Description of the reference numerals
1-a medium-low temperature geothermal power generation device, 2-a geothermal production well, 3-a geothermal recharging well, 4-a geothermal production well pipeline, 5-a geothermal recharging well pipeline, 6-a high-temperature heat pump, 7-a heat exchanger in the production well, 8-a recharging well heat exchanger, 9-a heat pump production well side pipeline, 10-a heat pump recharging well side pipeline, 11-a power grid, 12-an internet access circuit, 13-a power supply circuit and 14-an external heat supply interface.
Detailed Description
The present invention will be described in further detail with reference to specific examples, which are provided for illustrative purposes only, and are not intended to be limiting, and the scope of the present invention should not be limited thereby.
Referring to fig. 1, a schematic structural diagram of a deep well geothermal power generation, heat storage and heat supply system for peak shaving of a power grid is shown in an embodiment of the system.
A deep well geothermal power generation, heat storage and heat supply system for power grid peak shaving is innovative in that: the system comprises a medium-low temperature geothermal power generation device 1, wherein the medium-low temperature geothermal power generation device is respectively connected with a geothermal production well 2 and a geothermal recharging well 3 through a geothermal production well pipeline 4 and a geothermal recharging well pipeline 5, and the medium-low temperature geothermal power generation device is connected with a power grid 11 through an internet circuit 12. The medium-low temperature thermal power generation device can adopt power generation technologies such as an organic Rankine cycle, a kalina cycle and an expansion flash evaporation power generation system.
The geothermal heat generating device uses geothermal heat producing well as heat source, the geothermal heat producing well pumps geothermal fluid to the geothermal heat generating device to generate electricity through geothermal heat producing well pipe, the geothermal fluid can be steam or geothermal water or steam-water mixture, the tail water after generating electricity is recharged to the geothermal recharging well through geothermal heat generating recharging well pipe 5.
The geothermal recharging well is internally provided with a recharging well heat exchanger 8 which exchanges heat with fluid in the geothermal recharging well, heat is transmitted to the high-temperature heat pump 6 through a heat pump recharging well side pipeline 10, and the heat is transmitted to a production well heat exchanger 7 through a heat pump production well side pipeline 9 after being heated by the high-temperature heat pump, and the fluid in the geothermal production well is heated.
The high-temperature heat pump is connected with a power grid through a power supply circuit 13 and obtains electric energy, the high-temperature heat pump recharging well side circulating working medium is water, the production well side circulating working medium can be water or steam, and the high-temperature heat pump is provided with an external heat supply interface 14.
The heat exchanger in the heat pump recharging well and the heat exchanger in the heat pump production well can be in the form of U-shaped tubes, coaxial sleeve tubes or other underground heat exchangers, and the heat exchangers are closed heat exchangers and do not exchange substances with fluids in the geothermal production well and the geothermal recharging well so as to avoid damaging the high-temperature heat pump.
The heat exchanger in the production well is subjected to heat preservation treatment except for the water taking section of the production well so as to avoid heat loss, and the heat exchanger in the corresponding section can be made of materials with low heat conductivity coefficients for realizing heat preservation, or heat preservation materials are externally coated, and heat preservation coatings are externally coated.
The utility model discloses a theory of operation does:
1) judging the electricity utilization time period of the deep well geothermal power generation, heat storage and heat supply system by manual control or adding an automatic control system;
2) performing corresponding control operation according to the judgment result of the power utilization time period in the step 1):
i: if the electricity consumption time period belongs to the electricity consumption valley time period, the medium-low temperature geothermal power generation device is closed, the high-temperature heat pump is started, the external heat supply interface is closed, the heat exchanger in the production well is started, the fluid in the geothermal recharging well is used as a heat source to heat water or steam in the geothermal production well, and the working condition of the high-temperature heat pump is matched and regulated according to the temperatures in the geothermal production well and the geothermal recharging well so as to improve the heating effect to the maximum extent. If the temperature in the production well meets the design requirement, the heat exchanger in the production well can be closed, and an external heat supply interface can be opened to supply heat for the tail ends of other buildings and the like according to the actual external heat supply requirement;
ii: if the electricity consumption time period belongs to the electricity consumption peak time period, the medium-low temperature geothermal power generation device is started, water or steam in the geothermal production well is used as a heat source to generate electricity, tail water is discharged into the geothermal recharging well, electric power is transmitted to the power grid, and the medium-low temperature geothermal power generation device is adjusted and controlled in a matching mode according to the temperature in the geothermal production well until the electricity consumption peak time period is finished, so that the power generation power is improved to the maximum extent. If external heat supply is required, closing the heat exchanger in the production well, opening an external heat supply interface, and opening a high-temperature heat pump to supply heat for the tail ends of other buildings and the like;
iii: if the electricity consumption time period belongs to the electricity consumption ordinary time period, the economy of power generation, heat storage or heat supply is calculated according to the real-time electricity price and the parameters in the well, and whether the power generation, the heat storage or the external heat supply is started or not is determined.
Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims, and therefore, the scope of the present invention is not limited to the disclosure of the embodiments and the accompanying drawings.
Claims (5)
1. A deep well geothermal power generation, heat-retaining and heating system for power grid peak shaving is characterized in that: the system comprises a medium-low temperature geothermal power generation device, wherein the medium-low temperature geothermal power generation device is respectively connected with a geothermal production well and a geothermal recharging well through a geothermal production well pipeline and a geothermal recharging well pipeline, and the medium-low temperature geothermal power generation device is connected with a power grid through an internet circuit.
2. The deep-well geothermal power generation, heat storage and heat supply system for power grid peak shaving according to claim 1, wherein: and the geothermal production well is internally provided with a heat exchanger in the production well, and the heat exchanger in the production well is connected with the high-temperature heat pump through a pipeline at the side of the heat pump production well.
3. The deep-well geothermal power generation, heat storage and heat supply system for power grid peak shaving according to claim 1, wherein: and the geothermal recharging well is internally provided with a heat exchanger in the recharging well, and the heat exchanger in the recharging well is connected with the high-temperature heat pump through a pipeline at the side of the heat pump recharging well.
4. The deep-well geothermal power generation, heat storage and heat supply system for power grid peak shaving according to claim 3, wherein: the heat exchanger in the recharging well and the heat exchanger in the production well are U-shaped tubular or coaxial sleeve type closed heat exchangers.
5. The deep-well geothermal power generation, heat storage and heat supply system for power grid peak shaving according to claim 2 or 3, wherein: the high-temperature heat pump is provided with an external heat supply interface.
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| CN201920738752.6U CN210345939U (en) | 2019-05-22 | 2019-05-22 | Deep well geothermal power generation, heat storage and heat supply system for power grid peak shaving |
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| CN201920738752.6U CN210345939U (en) | 2019-05-22 | 2019-05-22 | Deep well geothermal power generation, heat storage and heat supply system for power grid peak shaving |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207409A (en) * | 2019-05-22 | 2019-09-06 | 天津大学 | Deep-well geothermal power generation, heat accumulation and heating system and control method for peak load regulation network |
| CN114046230A (en) * | 2021-09-28 | 2022-02-15 | 宁波大学 | Air compression energy storage and hot water-containing stratum geothermal exploitation coupling system |
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2019
- 2019-05-22 CN CN201920738752.6U patent/CN210345939U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207409A (en) * | 2019-05-22 | 2019-09-06 | 天津大学 | Deep-well geothermal power generation, heat accumulation and heating system and control method for peak load regulation network |
| CN110207409B (en) * | 2019-05-22 | 2024-03-15 | 天津大学 | Control method of deep well geothermal power generation, heat storage and heat supply system for power grid peak shaving |
| CN114046230A (en) * | 2021-09-28 | 2022-02-15 | 宁波大学 | Air compression energy storage and hot water-containing stratum geothermal exploitation coupling system |
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