CN108167917B - Heating system of hot dry rock technology coupling heat pump - Google Patents
Heating system of hot dry rock technology coupling heat pump Download PDFInfo
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- CN108167917B CN108167917B CN201711248267.2A CN201711248267A CN108167917B CN 108167917 B CN108167917 B CN 108167917B CN 201711248267 A CN201711248267 A CN 201711248267A CN 108167917 B CN108167917 B CN 108167917B
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- heat pump
- water
- injection well
- water injection
- hot dry
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D12/00—Other central heating systems
- F24D12/02—Other central heating systems having more than one heat source
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/11—Geothermal energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
- F24D2200/123—Compression type 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Abstract
The invention relates to the technical field of hot dry rock heat energy utilization, in particular to a high-efficiency hot dry rock technology coupled heat pump heating system, which solves the problems of low heating efficiency of a hot dry rock heating system and low long-term operation efficiency of a ground source heat pump. In the long term, the heat supply system can operate all the year round, the heat exchange efficiency of the whole system is higher than that of the traditional ground source heat pump, the cost performance is higher, and the operation is more stable and durable.
Description
Technical Field
The invention relates to the technical field of hot dry rock heat energy utilization, in particular to a heating system of a high-efficiency hot dry rock technology coupled heat pump.
Background
With the development of economy and the improvement of the living standard of people, energy and environmental problems become more and more the subjects of human attention, wherein, the dry hot rock is taken as a clean energy buried underground, the heat stored in the dry hot rock is abundant, but the dry hot rock is not developed and utilized on a large scale.
At present, the mining technology of the geothermal energy at the middle and deep layers in China is not mature, and no report about the technology for extracting the thermal energy of the dry-hot rock by utilizing artificial fracturing is found. Internationally, the single-cycle method is generally adopted to obtain geothermal energy, and the defects of low geothermal energy obtaining rate and utilization rate and the like exist. Meanwhile, the deep dry hot rock energy has the advantages of large investment, high risk and low power generation capacity, and greatly limits the exploitation of the heat energy of the dry hot rock.
In some high-latitude cold areas (such as Shenyang, Beijing, etc.) in China, a large amount of heat energy needs to be consumed for heating in winter, the pollution is serious by utilizing the conventional fossil fuel, and the cost performance of electric energy is low, so that the ground source heat pump is widely popularized and applied. However, the annual heat recovery of ground source heat pump systems in these areas causes severe problems such as the annual drop of formation temperature, the annual drop of formation pressure and the annual drop of heat extraction efficiency.
With continuous development and utilization of the hot dry rock, a U-shaped tubular hot dry rock heat exchanger is disclosed in patent CN201520986148.7, a hot dry rock heating system is disclosed in patent CN107062352A, and a single-well hot dry rock heat energy extraction system is disclosed in patent CN106885385A, so that extraction and application of hot dry rock heat energy are realized to different degrees.
However, none of the above patents really solves the problem of low heating efficiency in the dry hot rock heating system, and in addition, the ground source heat pump also has the problem of the efficiency decreasing year by year.
Disclosure of Invention
The invention provides a high-efficiency heating system with a dry hot rock technology coupled with a heat pump, which aims to solve the problems of low heating efficiency of the dry hot rock heating system and year-by-year decline of the efficiency of a ground source heat pump, and effectively combines the dry hot rock mining technology with the heat pump technology.
The invention is realized by the following technical scheme: the utility model provides a heating system of high efficiency hot dry rock technique coupling heat pump, is including setting up the hot dry rock geothermal system in the underground and setting up the heat pump system on the earth's surface, and hot dry rock geothermal system is connected with plate heat exchanger group, and plate heat exchanger group connects with heat pump system, and heat pump system is connected with terminal heating system.
The hot dry rock geothermal system comprises a water injection well and a water pumping well, wherein the water injection well and the water pumping well are horizontal wells, the water injection well is connected with a plate type heat exchanger set, a plurality of hydraulic fracturing staged cracks which are parallel to each other and perpendicular to the water injection well are arranged in the water injection well at intervals, the water pumping well is symmetrically arranged in the hydraulic fracturing staged crack length range, the water pumping well is connected with a circulating pump, and the circulating pump is connected with the plate type heat exchanger set.
The heat pump system comprises an evaporator, a compressor, an expansion valve and a condenser, cold water is heated by the plate heat exchanger set, then flows through the evaporator and the compressor to be further heated, then flows through the condenser to release heat to a terminal heating system, and water flowing out of the condenser is cooled by the expansion valve and then circulates to the plate heat exchanger set.
The water injection well is arranged in a heat storage layer with the vertical depth of 1500-2500 m from the ground surface, and the length of the water injection well is 1800-2200 m.
The hydraulic fracturing staged fractures are propped by a fracturing proppant. The fracturing propping agent is a ceramic particle product with high fracturing strength, and a ceramsite supporting material enters a stratum along with a high-pressure solution and is filled in a rock stratum fracture to play a role in supporting the fracture not to be closed due to stress release, so that high flow conductivity is maintained, and hot gas is smooth.
The working principle of the invention is as follows:
1) injecting cold water with the temperature of 5 ℃ to a hot reservoir with the temperature of 1500-2500 m underground through a water injection well, wherein the temperature of the stratum in the range is 45-75 ℃;
2) cold water flows through the hydraulic fracturing segmented cracks supported by the proppant to be heated, and then is pumped out through a pumping well;
3) the pumped hot water is driven by a circulating pump to flow through the plate type heat exchanger group;
4) through the multi-stage heat exchange of the plate type heat exchanger group, the cooled water (about 5 ℃) is injected into the hot dry rock reservoir through the water injection well again to circularly take heat;
5) the heat pump system pumps the internal cold water into the plate type heat exchanger group for heating, and the outflow hot water is further heated to a higher temperature through the evaporator and the compressor;
6) the hot water in the heat pump system releases heat to the terminal heating system through the condenser, and the cooled water enters the plate heat exchanger group for circulating heat extraction after being further cooled by the expansion valve.
The system is mainly applied to high-latitude cold regions (such as northern China, northeast China and northwest China), the system is operated to supply heat in the winter heating period every year, the system is closed in the rest of time, and refrigeration or natural cooling is carried out by virtue of an air conditioner in summer, so that the problem of stratum temperature reduction caused by long-term extraction of terrestrial heat by a ground source heat pump can be solved. In addition, the system can also be applied to other areas, is used for heating in winter, and can fill cold water into the ground in summer to achieve the refrigeration effect of the heat pump.
Compared with the traditional ground source heat pump or solar energy combined ground source heat pump heating system, the invention has the advantages that:
the heating system has small floor area and no limit on site, can realize central heating in a larger range, and can operate all the year round and the heat exchange efficiency of the whole system is higher than that of the traditional ground source heat pump in a long term because the reduction speed of the formation temperature and the underground water outlet temperature is lower than that of the traditional ground source heat pump, so that the cost performance is higher, and the operation is more stable and durable. Compared with a dry hot rock heating system, the dry hot rock heating system has the advantages that: the underground part of the invention refers to the technology for exploiting the dry-hot rock, the thermal reservoir reached by the well drilling can be sedimentary rock, magma rock or metamorphic rock, and only the reservoir temperature is required to reach more than 50 ℃, so the requirement on the geological condition is not high, and the invention has wider regional application and reduces the well drilling cost compared with the traditional dry-hot rock heating.
Drawings
Fig. 1 is a schematic structural diagram of a heating system of a dry hot rock thermal energy coupling heat pump in the invention.
In the figure: the method comprises the following steps of 1-hydraulic fracturing segmented cracks, 2-pumping wells, 3-water injection wells, 4-circulating pumps, 5-plate heat exchanger groups, 6-evaporators, 7-compressors, 8-expansion valves, 9-condensers, 10-terminal heating systems, 11-heat pump systems and 12-hot dry rock geothermal systems.
Detailed Description
The invention is further explained by referring to fig. 1, and the high-efficiency dry hot rock technology coupled heat pump heating system comprises a dry hot rock geothermal system 12 arranged underground and a heat pump system 11 arranged on the ground surface, wherein the dry hot rock geothermal system 12 is connected with a plate type heat exchanger group 5, the plate type heat exchanger group 5 is connected with the heat pump system 11, and the heat pump system 11 is connected with a terminal heating system 10.
The underground hot dry rock geothermal system can be formed and used after being transformed, and the forming process is as follows: firstly drilling a horizontal well as a water injection well 3, wherein the vertical depth of the water injection well 3 relative to the ground surface is about 2000 m, and the length of the water injection well 3 is about 2000 m; further, performing multi-fracture staged hydraulic fracturing on the water injection well 3, and obtaining a plurality of hydraulic fracturing staged fractures 1 which are arranged at intervals and are vertical to the water injection well 3 by adopting a proppant fracturing mode; furthermore, according to the microseism monitoring result, two horizontal wells are drilled at two ends of the hydraulic fracturing segmented fracture 1 to serve as water pumping wells 2, and the water pumping wells 2 sequentially penetrate through the hydraulic fracturing segmented fracture 1 to form a hot dry rock geothermal system 12.
The whole operation process of the system is as follows:
1) injecting cold water with the temperature of 5 ℃ into the ground through a water injection well 3 to a target heat reservoir;
2) the injected cold water flows through a hydraulic fracturing subsection crack 1 supported by a propping agent to be heated and is pumped out through a pumping well 2;
3) the pumped hot water is driven by the circulating pump 4 and flows through the plate type heat exchanger group 5;
4) through the multi-stage heat exchange of the plate type heat exchanger group 5, part of water is cooled, and the cooled water (about 5 ℃) is injected into the hot dry rock reservoir through the water injection well 3 again to circularly take heat;
5) the heat pump system 11 pumps the internal cold water into the plate heat exchanger group 5 for heating, and the outflow hot water is further heated to a higher temperature through the evaporator 6 and the compressor 7;
6) the hot water in the heat pump system 11 releases heat to the terminal heating system 10 through the condenser 9, and the cooled water enters the plate heat exchanger group 5 for circulation and heat extraction after further being cooled by the expansion valve 8.
The arrows shown in the figure are water flow directions, with the single arrows being cold flow and the double arrows being hot flow.
Claims (1)
1. A heating system of hot dry rock technology coupling heat pump which characterized in that: the system comprises a hot dry rock geothermal system (12) arranged underground and a heat pump system (11) arranged on the earth surface, wherein the hot dry rock geothermal system (12) is connected with a plate heat exchanger group (5), the plate heat exchanger group (5) is connected with the heat pump system (11), the heat pump system (11) is connected with a terminal heating system (10), the hot dry rock geothermal system (12) comprises a water injection well (3) and a water pumping well (2), the water injection well (3) and the water pumping well (2) are both horizontal wells, the water injection well (3) is connected with the plate heat exchanger group (5), a plurality of hydraulic fracturing segmented cracks (1) which are parallel to each other and vertical to the water injection well (3) are arranged in the water injection well (3) at intervals, the water pumping wells (2) are symmetrically arranged in the length range of the hydraulic fracturing segmented cracks (1), the water pumping wells (2) are connected with circulating pumps (4), and the circulating pumps, the heat pump system (11) comprises an evaporator (6), a compressor (7), an expansion valve (8) and a condenser (9), cold water is heated by a plate-type heat exchanger group (5) and then flows through the evaporator (6) and the compressor (7) to be further heated, then flows through the condenser (9) to release heat to a terminal heating system (10), water flowing out of the condenser (9) is cooled by the expansion valve (8) and then circulates to the plate-type heat exchanger group (5), a water injection well (3) is arranged in a heat storage layer with the vertical depth of 1500-2500 m from the ground surface, the length of the water injection well (3) is 1800-2200 m, and a hydraulic fracturing segmented fracture (1) is supported by a fracturing propping agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711248267.2A CN108167917B (en) | 2017-12-01 | 2017-12-01 | Heating system of hot dry rock technology coupling heat pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711248267.2A CN108167917B (en) | 2017-12-01 | 2017-12-01 | Heating system of hot dry rock technology coupling heat pump |
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| CN108167917A CN108167917A (en) | 2018-06-15 |
| CN108167917B true CN108167917B (en) | 2020-02-07 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110131909A (en) * | 2019-05-08 | 2019-08-16 | 中国神华能源股份有限公司 | Goaf heat collection heat-exchange system and collection heat-exchange method |
| CN112344599A (en) * | 2020-11-16 | 2021-02-09 | 吉林大学 | Medium-low temperature enhanced geothermal composite heat pump system |
| CN113203213B (en) * | 2021-04-07 | 2022-06-14 | 太原理工大学 | Novel ground source heat pump system of artificial aquifer combined with shallow coaxial sleeve |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105737232A (en) * | 2016-04-19 | 2016-07-06 | 济南国海能源科技有限公司 | High-efficiency clean energy source heat supplying system using heat energy of hot dry rocks |
| CN106996658A (en) * | 2017-05-02 | 2017-08-01 | 中能服能源科技股份有限公司 | A kind of ultradeep well hot dry rock steam turbine formula heat pump waste heat recovery heating system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011119409A2 (en) * | 2010-03-22 | 2011-09-29 | Skibo Systems Llc | Systems and methods for an artificial geothermal energy reservoir created using hot dry rock geothermal resources |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105737232A (en) * | 2016-04-19 | 2016-07-06 | 济南国海能源科技有限公司 | High-efficiency clean energy source heat supplying system using heat energy of hot dry rocks |
| CN106996658A (en) * | 2017-05-02 | 2017-08-01 | 中能服能源科技股份有限公司 | A kind of ultradeep well hot dry rock steam turbine formula heat pump waste heat recovery heating system |
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| CN108167917A (en) | 2018-06-15 |
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