CN111457512A - Medium-deep geothermal coupling energy storage multi-source heat supply and refrigeration process and system - Google Patents

Medium-deep geothermal coupling energy storage multi-source heat supply and refrigeration process and system Download PDF

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Publication number
CN111457512A
CN111457512A CN202010303716.4A CN202010303716A CN111457512A CN 111457512 A CN111457512 A CN 111457512A CN 202010303716 A CN202010303716 A CN 202010303716A CN 111457512 A CN111457512 A CN 111457512A
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heat
working medium
geothermal
temperature
deep
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曹龙
张瑾
蒋荣辉
种蕊
艾腾飞
王珊珊
胡波
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Xi'an Lianchuang Distributed Renewable Energy Research Institute Co ltd
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Xi'an Lianchuang Distributed Renewable Energy Research Institute Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
    • F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
    • F24F2005/0032—Systems storing energy during the night
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • F24F2005/0057—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground receiving heat-exchange fluid from a closed circuit in the ground
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • F24F2005/0064—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy
    • F24F2005/0067—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy with photovoltaic panels
    • 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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sustainable Development (AREA)
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  • General Life Sciences & Earth Sciences (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

The invention provides a multi-source heat supply and refrigeration process and system for coupling energy storage of middle-deep geothermal heat.A lower-temperature working medium enters underground to absorb the middle-deep geothermal heat, then carries out heat exchange on the ground and then circularly enters underground; the higher temperature working medium generated after heat exchange on the ground is transmitted to a terminal user; meanwhile, the low-temperature working medium subjected to primary heat exchange can enter a heat pump unit to perform secondary heat exchange and supply heat again according to requirements, and the low-temperature working medium subjected to secondary temperature reduction is returned to the underground heat collector to absorb the geothermal heat in the middle and deep layers, so that the heat supply capacity is enlarged, and the gradient utilization of the geothermal heat in the middle and deep layers is realized; the cold energy of the end user is provided by the dual-working-condition heat pump host and the cooling equipment; the redundant heat or cold of the dual-working-condition heat pump unit is stored and supplied to a terminal user; the middle-deep geothermal energy and the energy storage technology are coupled, heat is produced and stored at low load, and the peak loading capacity is reduced.

Description

Medium-deep geothermal coupling energy storage multi-source heat supply and refrigeration process and system
Technical Field
The invention relates to an underground heat energy utilization technology, in particular to an underground heat exchanger, and a multi-source heat supply and refrigeration process and system for coupling and storing energy of medium-deep geothermal heat.
Background
The energy supply of the intermediate-deep geothermal energy refers to energy supply by extracting heat contained in high-temperature rock masses about 2000m underground, is a novel clean and efficient energy supply mode, and is gradually popularized and applied. How to utilize geothermal resources more efficiently and reduce investment and operation cost is an important subject which needs to be solved urgently at present and is also a key for breaking the popularization and application of intermediate-deep geothermal resources.
The principle adopted by the prior art scheme is shown in figure 1, an underground heat collector generally adopts a double-layer petroleum casing pipe, the temperature of cold water in an outer pipe 1a is increased after heat exchange with an underground rock body, the cold water is output to a heat exchanger (or a heat pump unit) 3a through an inner pipe 2a for energy exchange, and the cold water returns to a geothermal well for circulation after the temperature is reduced. After the heat is transferred to the secondary pipe network through the pipe network 3a, the heat is conveyed to the end user 4a for heat supply. And (3) heating by singly adopting the geothermal energy of the middle-deep layer, wherein the total heating load needs to cover the maximum heat demand, and the required number of geothermal wells is the maximum heat demand Q1 of the building divided by the heat quantity of the single well. There are problems in that:
1. the system configuration is unreasonable, the investment is huge, although a patent also provides that the middle-deep geothermal energy is coupled with the gas boiler, the initial investment can be reduced, but the operation cost is increased;
2. the efficiency of a geothermal well heat collector is not high;
3. the system mainly solves the problems of heat supply, single design of a refrigerating system and independent purchase of a refrigerating unit;
4. the heat pump unit is the main energy consumption unit, and the operation cost needs further reduction.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a multi-source heating and refrigerating process and system for coupling and storing energy of medium-deep geothermal heat, which solve the problems of low heat taking efficiency of an underground heat exchange well, large investment and high operating cost of a medium-deep geothermal system,
in order to achieve the purpose, the invention adopts the following technical means:
a multi-source heating and refrigerating process with medium-deep geothermal coupling energy storage is characterized in that a lower-temperature working medium enters underground to absorb medium-deep geothermal heat and then circularly enters underground after heat exchange occurs on the ground; the higher temperature working medium generated after heat exchange on the ground is transmitted to a terminal user; meanwhile, after the heat of the low-temperature working medium is promoted, part of the low-temperature working medium returns to the ground to absorb the geothermal heat in the middle and deep layers, and the other part supplies energy to a terminal user, so that the gradient utilization of the geothermal heat in the middle and deep layers is realized; the cold energy of the end user is provided by the dual-working-condition heat pump host and the cooling equipment; and the redundant heat or cold of the dual-working-condition heat pump unit is stored and supplied to a terminal user.
The invention also provides an underground heat collector which comprises a body structure, wherein a temperature rise heat transfer layer and a constant temperature layer are arranged in the body structure, and a horizontal partition plate is arranged between the temperature rise heat transfer layer and the constant temperature layer; a hot water production pipe penetrates through the center of the body structure and is provided with a backwater heat exchange pipe communicated with two sides of the hot water production pipe; in the constant temperature layer, a heat insulation filler is arranged between the hot water producing pipe and the backwater heat exchange pipe.
In particular, the body structure is located underground, including an outer jacket.
On the basis, the invention also provides a multi-source heating and refrigerating system for medium-deep geothermal coupling energy storage, wherein a lower-temperature working medium enters the underground heat collector to absorb heat, then is subjected to heat exchange by an overground heat exchanger, and then circularly enters the underground heat collector; the working medium with higher temperature passing through the heat exchanger is conveyed to a terminal user;
a first bypass pipeline is arranged between a backwater heat exchange pipe of the underground heat collector and a pipeline of the heat exchanger, a low-temperature working medium enters the double-working-condition heat pump unit through the bypass pipeline to lift the heat of the low-temperature working medium, and then the heat exchanger is combined to supply energy to a terminal user, so that the gradient utilization of the intermediate-deep geothermal heat is realized;
a condenser water inlet and outlet pipeline of the dual-working-condition heat pump host is communicated with the cooling tower to provide cooling capacity for a terminal user;
and a second bypass pipeline is arranged on a pipeline between the double-working-condition heat pump unit and the end user, redundant heat or cold of the double-working-condition heat pump unit is stored in the energy storage device through the second bypass pipeline, and the energy storage device releases the heat or the cold to supply to the end user.
In addition, still include photovoltaic power generation system, supply the electric power to supply for two operating mode heat pump set and entire system.
In addition, the energy storage device also comprises an energy release heat exchanger, and the energy storage device releases heat or cold through the energy release heat exchanger.
Preferably, the end user employs a capillary network system.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention reduces the initial investment of the geothermal heat in the middle and deep layers and reduces the operation cost at the same time, and the invention adopts Q2 load to configure the system, thereby saving the cost of the geothermal well: [ (Q1-Q2)/single well heat supply ]. single well cost, load above Q2 is prepared and stored in advance with the low valley price, releases when the peak price, reduces the running cost, and coupling photovoltaic power generation simultaneously, further reduces outsourcing electric power, reduces the running cost. Specifically, the method comprises the following steps:
1) the underground heat collector solves the problem of influence of low-temperature return water on high-temperature outlet water in the conventional heat exchanger structure, and improves the heat collection efficiency of the utilization of the geothermal energy in the middle and deep layers. The heat exchanger is characterized by simple structure and convenient implementation. The problem of other heat exchangers structure complicacies, arranges the difficulty in the well deep hole is solved.
2) The system reduces the maximum installed scale of the ground heat in the middle and deep layers and saves the investment cost of the system on the basis of not sharing heat supply load by other heat supply equipment such as a boiler and the like through the peak clipping and valley filling functions of the energy storage device, and simultaneously provides different operation strategies and reduces the operation cost through the requirement conditions of different tail end cold and heat loads.
3) The system improves the condition that the medium-deep geothermal heat pump system can not refrigerate, and the medium-deep geothermal heat pump host is converted into a refrigerating unit through switching of pipelines, so that the cold requirement of a user is met.
4) The invention not only provides the coupling of the intermediate-deep geothermal energy and the energy storage technology, but also realizes the coupling with the photoelectric technology, thereby further reducing the consumption of the system to outsourcing electric power and the operation cost.
5) The tail end of the heat supply and refrigeration system adopts a capillary network technology, combines the capillary network technology with the medium-deep geothermal technology, reduces the temperature of heat supply and water supply to 25-35 ℃, improves the geothermal heat supply efficiency, reduces the consumption of a heat pump unit, and can provide comfortable, efficient and quiet energy supply conditions.
Drawings
Fig. 1 is a schematic diagram (a) and a user load curve diagram (b) of the prior art.
Fig. 2 is a diagram of a middle-deep geothermal coupling energy storage heating and refrigerating system.
Fig. 3 is a schematic diagram of an underground heat collector.
Wherein: 1 underground heat collector, 2 circulating pump I, 3 stop valve a, 4 stop valve b, 5 stop valve c, 6 heat exchangers, 7 cooling towers, 8 photovoltaic power generation devices, 9 stop valve d, 10 circulating pump II, 11 stop valve e, 12 circulating pump III,13 capillary network end heat consumers, 14, stop valve f, 15 stop valve g, 16 circulating pump IV,17 double-effect heat pump unit, 18 energy release heat exchangers, 19 energy storage circulating pump V,20 energy release circulating pump VI,21 energy storage device, 22 stop valve h, 23 stop valve I, 24 stop valve j, 25 stop valve k, 26 clapboards, 27 return water heat exchange tubes, 28 heat insulation filler, 29 outer protecting tubes, 30 hot water producing tubes.
The embodiments of the present invention will be further described with reference to the drawings and examples.
Detailed Description
The low-temperature working medium is a working medium which increases the heat load demand along with the reduction of the outside air temperature and reduces the temperature of the working medium after heat exchange to about 30-40 ℃. The lower temperature working medium of the invention is slightly higher than the low temperature working medium compared with the low temperature working medium, and generally occurs in a period of small heat load of a user (such as the initial heating period and the high temperature of the external environment). The working medium with higher temperature is relative to the working medium before the user end enters the heat exchanger, is conveyed to the end user through the working medium with higher temperature of the heat exchanger, generally has the temperature of about 50 ℃, and can be adjusted according to the actual underground condition of an engineering place.
Therefore, the lower temperature working medium refers to a working medium before entering underground to absorb the geothermal heat of the middle-deep layer, the working medium with higher temperature is generated after heat exchange occurs on the ground, if the working medium with higher temperature enters a heat pump unit to be recycled after secondary heat exchange, and the working medium with lower temperature is generated again after the secondary heat exchange, the working medium with lower temperature, the working medium with higher temperature and the working medium with lower temperature can be the same working medium, and only the temperatures are different.
The medium-deep geothermal heat is the heat contained in high-temperature rock masses about 2000m underground, and the energy supply by using the medium-deep geothermal heat is realized by extracting the heat contained in the high-temperature rock masses about 2000m underground.
The medium-deep geothermal energy is circularly returned to the underground to absorb the medium-deep geothermal energy, so that the heating capacity is enlarged, and the gradient utilization of the medium-deep geothermal energy is realized;
example 1:
the embodiment provides a multi-source heat supply and refrigeration process for coupling and storing energy of medium-deep geothermal heat.A lower-temperature working medium enters underground to absorb the medium-deep geothermal heat and then circularly enters underground after heat exchange occurs on the ground; generating a higher-temperature working medium after overground heat exchange, and conveying the working medium to a terminal user; meanwhile, part of the working medium with higher temperature generated after heat exchange occurs on the ground enters a heat pump unit for secondary heat exchange to be recycled, and then the working medium is circularly returned to the ground to absorb the geothermal heat of the middle and deep layers so as to enlarge the heat supply capacity and realize the gradient utilization of the geothermal heat of the middle and deep layers; the cold energy of the end user is provided by the dual-working-condition heat pump host and the cooling equipment; and the redundant heat or cold of the dual-working-condition heat pump unit is stored and supplied to a terminal user.
The process design concept can meet the requirements of cooling and heating and realize gradient utilization of heat. Along with the reduction of the outside air temperature, the heat load demand is increased, the low-temperature working medium absorbs terrestrial heat, which is one of the utilization ways, and meanwhile, the temperature of the working medium after heat exchange is reduced to about 30-40 ℃, and the working medium absorbs heat circularly again. The lower temperature working medium is generally generated in a period with a small heat load of a user (such as the initial heating period and the high temperature of the external environment), the generation conditions of the lower temperature working medium are slightly different from those of the low temperature working medium, but the general principle is that the working medium needing heat exchange enters a middle-deep underground layer to absorb heat, the higher temperature working medium is relative to the working medium before a user end enters a heat exchanger, the working medium is conveyed to a terminal user through the higher temperature working medium of the heat exchanger, the general temperature is about 50 ℃, and the working medium can be adjusted according to the actual underground condition of an engineering place.
Example 2:
the embodiment provides an underground heat collector, divide into the underground section of heating and the constant temperature section two parts, set up baffle (26) between the two parts, the constant temperature section is arranged length and is unanimous with secret constant temperature layer thickness, mainly set up two return water heat exchange tubes (27) and be used for carrying the low temperature water after the external heat transfer underground once more with the rock mass heat transfer, return water heat exchange tube (27) and baffle (26) welding, baffle (26) mainly play and connect pipeline and fixed pipeline effect from top to bottom, set up thermal-insulated filler (28) between return water heat exchange tube (27) and hot water production pipe (30), the primary function is thermal-insulated heat preservation, prevent that the low temperature recovery in hot water production pipe (30) and return water heat exchange tube (27) from producing the heat exchange, lead to producing the reduction of temperature, improve the water temperature. The backwater heat exchange tube (27) enters the temperature increasing bottom layer after passing through the partition plate (26), backwater in the pipeline is in full contact with the high-temperature rock mass through the outer protection tube for heat exchange, absorbs heat of the underground rock mass, is heated up, and is output to an external heat user through the hot water producing tube (30). The underground heat collector can realize the effect of heat collection without water collection, and simultaneously improves the temperature of water supply, thereby improving the heat efficiency of the geothermal well.
Example 3:
the embodiment provides a heating and refrigerating system with medium-deep geothermal coupling energy storage, which takes the medium-deep geothermal as a basic heat source, and achieves the goal of reducing investment and operation cost by combining with an energy storage system and then by electric power supplement of a photovoltaic system.
Heating operation:
when the heat load of a user is small (such as the initial heating period and the external environment temperature is high), only the circulating pump I (2), the valve b (4), the stop valve d (9) and the circulating pump II (10) are started at the moment. The low-temperature working medium enters the underground heat collector (1) to absorb heat in a driving mode of the circulating pump I (2), is output by the hot water producing pipe (30) after the temperature is increased to 45-50 ℃ (even higher, according to the actual underground condition of an engineering ground), and returns after heat exchange of the heat exchanger (6). The secondary pipe network receiving heat is driven by the circulating pump II (10) to convey hot water to the end user (13) of the capillary pipe network for heating, and in order to improve the heating quality and the utilization rate, the end user adopts the capillary pipe network as a heat dissipation terminal.
Along with the reduction of outside air temperature, the heat load demand increases, working medium temperature after the heat transfer reduces to about 30 ~ 40 ℃ (also can pass through many times of heat transfer, reduce the temperature once more), close valve b (4) this moment, open valve a (3) and valve c (5), make working medium entering dual mode heat pump set (17) after the cooling, heat in the working medium promotes to return in the underground heat collector (1) after recycling, working medium after dual mode heat pump set (17) promotes, under the effect of circulating pump III (12), the working medium that joint heat exchanger (6) heat transfer produced supplies energy for capillary network end user (13) jointly, the gradient utilization of the middle and deep ground heat that also realizes when increasing heat supply.
The middle-deep geothermal coupling energy storage device jointly supplies energy: go on in daily energy peak or electricity price peak period under this mode, through energy memory release energy, supply the output of middle and deep geothermal heat, reduce energy supply system power consumption simultaneously, main operation mode is: at night, the load of a user is small, and in the low-price period of the electricity of the user, the energy storage circulating pump V (19) is started, and the stop valve f (14), the stop valve g (15), the stop valve i (23) and the stop valve j (24) are opened. The intermediate-deep geothermal heat passes through the heat pump unit, and the excess heat is stored in the energy storage device (21) except for meeting the basic load of a user. In order to reduce the operation cost, the heat supply amount of the intermediate-deep geothermal heat to the energy storage device (21) is increased as much as possible in the valley electricity price period so as to store more heat. In the daytime energy consumption peak period, generally also the peak period of the electricity price, preferentially start energy release circulating pump VI (20), circulating pump IV (16), adopt energy memory release heat energy to supply heat for the user, less than the part by middle and deep layer geothermal system dual mode condition heat pump host computer (17) provide, reduce in peak value electricity price period, the power consumption of heat pump host computer (17), reduce the operating cost. Meanwhile, illumination resources are provided in the daytime, and the photovoltaic power generation system supplies power for the dual-working-condition heat pump host (17) and the whole system, so that the outsourcing amount of power is reduced, and the running cost is further reduced.
The other mode of combined energy supply of the medium-deep geothermal coupling energy storage device is that the load is low in the daytime, the heat energy released by the energy storage device (21) through the energy release heat exchanger (18) can meet the heat demand of a user (13), and when the operation mode is night off-peak electricity price and the load is low, the medium-deep geothermal system supplies heat to the user through the heat exchanger (6) and the double-working-condition host (17) and stores energy. Heat energy is released through the energy storage device (21) in the daytime, heat is provided for users, and the dual-working-condition unit (17) does not need to operate in the daytime.
The combined energy supply of the geothermal coupling energy storage devices in the middle and deep layers can reduce the operation cost, the output degree of the heating system in the middle and deep layers is reduced in the coupling operation time period, the heating system is only used as a supplementary energy source during energy release, and the heat of the underground heat exchanger can be recovered and balanced again in the time period. The stability of the medium-deep geothermal heating system is improved.
And (3) refrigerating operation:
the operation mode of the system during the cooling operation in summer is as follows: and closing the valve a (3) and the valve c (5), isolating the bypass of the underground heat collector (1), and simultaneously opening a valve on a cooling tower management system to communicate the water inlet and outlet pipeline system of the condenser of the dual-working-condition heat pump host (17) with the cooling tower (7). The dual-working-condition host (17) is switched to a cold supply working condition to provide cold for the end user (13) of the capillary network. The energy storage device (21) supplies cold for users through the cold storage and cold release coupling dual-working-condition host (17), and the difference between the system coupling mode during cold supply and the coupling mode during heat supply is that a valve i (23), a valve j (24) are closed, and a valve h (22), a valve k (25) are opened. Meanwhile, in the mode, if a user (13) has a small hot water demand in summer, the hot water can be provided for the user through the underground heat collector (1) and the heat exchanger (6). This mode of operation has solved the cold demand of user through setting up two operating mode heat pump host computer and connecting cooling tower (7), the mode of bypass underground heat collector (1), has avoided the user to purchase the investment of air conditioning unit alone for solving the cooling, has practiced thrift equipment investment cost.
The effect demonstrates that:
the system disclosed by the invention is already applied to a drum-Shaanxi geothermal heating system, and has obvious effects on saving energy, reducing the operation cost and reducing the initial investment. The following are the conditions of simulation, measurement and comparison of the system process in the invention and 2 prior published patents (the first prior patent: a middle-deep layer geothermal source heat pump system, application number 201710907384.9 and the second prior patent: a middle-deep layer interference-free ground rock heat system and gas boiler combined heat supply system, application number 201720830830833. X):
according to the method, the peak load of about 2230kW in the total load is replaced by stored energy according to the energy use change situation of the garden, the load required to be borne by the geothermal well is 4040kW, the investment of 4 geothermal wells can be reduced compared with the process in the prior patent I, the initial investment cost of the geothermal well can be saved by about 500 ten thousand yuan, and meanwhile, the peak valley electricity price difference is utilized by the stored energy, so that the operation cost is reduced by about 12 yuan compared with the cost of the heating season in the prior patent I (the operation cost is estimated according to the heat storage quantity of the heating season in the prior patent I), the process in the patent II is adopted to replace the load of 2230kW, a gas boiler 2.1 is required to be configured, the gas consumption of the gas boiler 2.1 hour is 2.1 million yuan, the load of the gas boiler 2.5 m/52 MW 2 m per year, and the load is 60.5 m per year, and the load is calculated according to the average heat supply capacity of the dry heat well in the Shaanxi province, and the process in the Shaanxi region3The estimated running cost of one heating season is 27.5 ten thousandThe initial investment of 4 wells can be reduced, but the operation cost in a heating season is increased by 15.5 ten thousand yuan compared with that of the first patent. Then this patent and the two schemes of patent contrast, a heating operation cost will be practiced thrift: 15.5+12 ═ 27.5 ten thousand yuan.

Claims (7)

1. A multi-source heat supply and refrigeration process of coupling energy storage of middle-deep geothermal heat is characterized in that a lower-temperature working medium enters underground to absorb middle-deep geothermal heat and then circularly enters underground after heat exchange occurs on the ground; generating a higher-temperature working medium after overground heat exchange, and conveying the working medium to a terminal user;
meanwhile, part of the working medium with higher temperature generated after heat exchange occurs on the ground enters a heat pump unit for secondary heat exchange to be recycled, and then the working medium is circularly returned to the ground to absorb the geothermal heat of the middle and deep layers so as to enlarge the heat supply capacity and realize the gradient utilization of the geothermal heat of the middle and deep layers;
the cold energy of the end user is provided by the dual-working-condition heat pump host and the cooling equipment; and the redundant heat or cold of the dual-working-condition heat pump unit is stored and supplied to a terminal user.
2. An underground heat collector comprises a body structure and is characterized in that a temperature rise heat transfer layer and a constant temperature layer are arranged in the body structure, and a horizontal partition plate is arranged between the temperature rise heat transfer layer and the constant temperature layer; a hot water production pipe penetrates through the center of the body structure and is provided with a backwater heat exchange pipe communicated with two sides of the hot water production pipe; in the constant temperature layer, a heat insulation filler is arranged between the hot water producing pipe and the backwater heat exchange pipe.
3. The underground heat collector of claim 2, wherein the body structure is located underground, the body structure is in the form of an outer casing, and a temperature raising and heat transfer layer and a constant temperature layer are arranged in the outer casing.
4. A multi-source heating and refrigerating system with medium-deep geothermal coupling energy storage is characterized in that a lower-temperature working medium enters an underground heat collector in the claim 2 or 3 to absorb heat, then exchanges heat through an overground heat exchanger, and then circularly enters the underground heat collector; the working medium with higher temperature passing through the heat exchanger is conveyed to a terminal user;
a first bypass pipeline is arranged between a backwater heat exchange pipe of the underground heat collector and a pipeline of the heat exchanger, after a low-temperature working medium enters a double-working-condition heat pump unit through the bypass pipeline to lift the heat of the low-temperature working medium, the heat exchanger is combined to supply energy to a terminal user, and the gradient utilization of the geothermal energy in the middle and deep layers is realized;
a condenser water inlet and outlet pipeline of the dual-working-condition heat pump host is communicated with the cooling tower to provide cooling capacity for a terminal user;
and a second bypass pipeline is arranged on a pipeline between the double-working-condition heat pump unit and the end user, redundant heat or cold of the double-working-condition heat pump unit is stored in the energy storage device through the second bypass pipeline, and the energy storage device releases the heat or the cold to supply to the end user.
5. The mid-deep geothermal-coupling energy storage multi-source heating and refrigerating system of claim 4, further comprising a photovoltaic power generation system for providing power supplement for the dual-working-condition heat pump unit and the whole system.
6. The multi-source heating and refrigerating system for geothermal coupling energy storage in the middle-deep layer of claim 4, further comprising an energy releasing heat exchanger, wherein the energy storage device releases heat or cold through the energy releasing heat exchanger.
7. The mid-deep geothermal-coupling energy-storage multi-source heating and cooling system of claim 4, wherein the end user uses a capillary network system.
CN202010303716.4A 2020-04-17 2020-04-17 Medium-deep geothermal coupling energy storage multi-source heat supply and refrigeration process and system Pending CN111457512A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114329738A (en) * 2022-01-13 2022-04-12 深能科技(山东)有限公司 Design method of photovoltaic-driven heat storage and supply system of middle-deep layer heat pump
CN114659195A (en) * 2022-03-24 2022-06-24 广东省电信规划设计院有限公司 Heat recycling method and device and computer storage medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114329738A (en) * 2022-01-13 2022-04-12 深能科技(山东)有限公司 Design method of photovoltaic-driven heat storage and supply system of middle-deep layer heat pump
CN114659195A (en) * 2022-03-24 2022-06-24 广东省电信规划设计院有限公司 Heat recycling method and device and computer storage medium
CN114659195B (en) * 2022-03-24 2024-02-09 广东省电信规划设计院有限公司 Heat recycling method and device and computer storage medium

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