CN112377965A - Geothermal heating system - Google Patents

Geothermal heating system Download PDF

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Publication number
CN112377965A
CN112377965A CN202011261363.2A CN202011261363A CN112377965A CN 112377965 A CN112377965 A CN 112377965A CN 202011261363 A CN202011261363 A CN 202011261363A CN 112377965 A CN112377965 A CN 112377965A
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China
Prior art keywords
hot
water
inlet
outlet
geothermal
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CN202011261363.2A
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Chinese (zh)
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CN112377965B (en
Inventor
张泽
刘亮德
樊梦芳
杜厚金
陈情来
陈宇
王亚彬
张倩
陈鹏
崔豫
李云
李小龙
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China National Petroleum Corp
China Petroleum Engineering and Construction Corp
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China National Petroleum Corp
China Petroleum Engineering and Construction Corp
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Priority to CN202011261363.2A priority Critical patent/CN112377965B/en
Publication of CN112377965A publication Critical patent/CN112377965A/en
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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
    • F24D3/00—Hot-water central heating systems
    • F24D3/18—Hot-water central heating systems using heat pumps
    • 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
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • 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
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)

Abstract

The disclosure relates to a geothermal heating system, and belongs to the field of geothermal heating. The geothermal heating system comprises a block heating station and a heat exchange central station. The district heating plant has first hot water supply inlet and first hot water supply outlet that communicate each other to and first hot return water export and the first hot return water entry that communicate each other. The heat pump of the block heating station is provided with a first input port and a first output port which are mutually communicated, and a second input port and a second output port which are mutually communicated, wherein the first input port and the second input port are respectively communicated with a first hot return water inlet, the first output port is communicated with a first hot water supply inlet, and the second output port is communicated with a first hot return water outlet. The heat pump is configured to lower the temperature of the hot return water output from the second output port and to raise the temperature of the hot supply water output from the first output port. The heat exchange central station is provided with a second hot backwater inlet and a second hot water supply outlet, the second hot backwater inlet is communicated with the first hot backwater outlet, and the second hot water supply outlet is communicated with the first hot water supply inlet.

Description

Geothermal heating system
Technical Field
The present disclosure relates to the field of geothermal heating, and more particularly, to a geothermal heating system.
Background
The geothermal heating system is a heating system which uses geothermal heat as a main heat source. The block geothermal heating system is used for supplying heat to residents and comprises a heat exchange central station and a block heating station.
The block heating station is provided with a first hot water supply inlet, a first hot water return outlet, a first hot water return inlet and a first hot water supply outlet, the first hot water supply inlet is communicated with the first hot water supply outlet, and the first hot water return outlet is communicated with the first hot water return inlet. The heat exchange central station comprises a geothermal production well, a recharging well and a heat exchanger, the heat exchanger comprises a geothermal water inlet, a geothermal water outlet, a second hot water supply outlet and a second hot water return inlet, the geothermal water inlet is communicated with the geothermal water outlet, and the second hot water supply outlet is communicated with the second hot water return inlet. The geothermal production well is communicated with the geothermal water inlet, the recharge well is communicated with the geothermal water outlet, the first hot water supply inlet is communicated with the second hot water supply outlet, and the first hot water return outlet is communicated with the second hot water return inlet. The user heating equipment is provided with a second hot water supply inlet and a second hot water return outlet which are communicated with each other. The first hot water supply outlet is communicated with the second hot water supply inlet, and the first hot water return inlet is communicated with the second hot water return outlet. After the hot water supply supplies heat to the user, the temperature of the hot water supply is reduced to become hot backwater, the hot backwater flows to the block heat supply station through the second hot backwater outlet and the first hot backwater inlet, and then flows to the heat exchanger through the first hot backwater outlet and the second hot backwater inlet. Geothermal water produced by the geothermal production well enters the heat exchanger through a geothermal water inlet of the heat exchanger, and the geothermal water transfers heat to hot return water through the heat exchanger. The temperature of the hot backwater is increased to be changed into hot water supply, the hot water supply enters the block heating station through the second hot water supply outlet and the first hot water supply inlet and flows to the second hot water supply outlet, and then the second hot water supply inlet flows to the user heating equipment to supply heat for the user. The temperature of the geothermal water is reduced after heat exchange of the heat exchanger, the geothermal water in the heat exchanger enters the recharge well through the geothermal water outlet, and the geothermal water is heated again through geothermal heat.
In the related art, the difference between the temperature of geothermal water output from a geothermal production well and the temperature of geothermal water input into a recharging well is small, and the geothermal water in a heat exchanger transfers less heat to the hot water supply, namely the utilization rate of geothermal energy is low, so that insufficient heat supply is caused to a block. In order to ensure sufficient heat supply to the block, more production wells and recharge wells need to be drilled to generate more geothermal water for heat supply, but the drilling investment is higher, so that the yield of a geothermal heat supply system is reduced.
Disclosure of Invention
The embodiment of the disclosure provides a geothermal heating system, which can improve the utilization rate of geothermal energy. The technical scheme is as follows:
the present disclosure provides a geothermal heating system, the geothermal heating system including: a block heating station and a heat exchange central station;
the district heating plant has first hot water supply entry, first hot return water export and is used for with first hot return water entry and the first hot water supply export of user's heating equipment intercommunication, first hot water supply entry with first hot water supply export intercommunication, first hot return water export with first hot return water entry intercommunication, the district heating plant includes:
the heat pump is provided with a first input port and a first output port which are communicated with each other, and a second input port and a second output port which are communicated with each other, the first input port and the second input port are respectively communicated with the first hot return water inlet, the first output port is communicated with the first hot water supply inlet, and the second output port is communicated with the first hot return water outlet; within the heat pump, the first input port and the second input port are spaced apart from each other, the first output port and the second output port are spaced apart from each other, the heat pump is configured to reduce a temperature of the hot return water output from the second output port, and to increase a temperature of the hot supply water output from the first output port;
the heat exchange central station is provided with a second hot backwater inlet and a second hot water supply outlet, the second hot backwater inlet is communicated with the first hot backwater outlet, and the second hot water supply outlet is communicated with the first hot water supply inlet.
In one implementation of the embodiment of the disclosure, a first flow regulating valve is disposed on the second input port of the heat pump.
In one implementation of the disclosed embodiment, the first hot water supply outlet includes: a first sub hot water supply outlet and a second sub hot water supply outlet;
the district heating plant further includes:
a water separator having a water separation inlet and a water separation outlet, the water separation inlet being communicated with the first hot water supply inlet, the water separation outlet being communicated with the first sub-hot water supply outlet and the second sub-hot water supply outlet;
and the pressurizing pump is communicated with the water diversion outlet and the second sub hot water supply outlet.
In one implementation manner of the embodiment of the present disclosure, the first hot return water inlet includes: the first sub-hot return water inlet and the second sub-hot return water inlet are arranged on the water inlet;
the district heating plant further includes:
the water collector is provided with a water collecting inlet and a water collecting outlet, the water collecting inlet is respectively communicated with the first sub-hot-return inlet and the second sub-hot-return inlet, and the water collecting outlet is respectively communicated with the first input port and the second input port.
In one implementation of the embodiment of the present disclosure, the district heating plant further includes:
the first water mixing pump is communicated with the first sub-hot water return inlet and the first sub-hot water supply outlet;
and the second water mixing pump is communicated with the second sub-hot water return inlet and the second sub-hot water supply outlet.
In one implementation of the embodiment of the present disclosure, the district heating plant further includes:
and the pressure reducing device is communicated with the water collecting inlet and the second sub-hot return water inlet.
In one implementation of the embodiment of the present disclosure, the first hot water supply outlet further includes a third sub-hot water supply outlet, and the third sub-hot water supply outlet is communicated with the water diversion outlet;
the first hot return water inlet further comprises a third sub-hot return water inlet, and the third sub-hot return water inlet is communicated with the water collecting inlet.
In one implementation manner of the embodiment of the present disclosure, the heat exchange central station includes:
the heat exchanger is provided with a heat exchange inlet and a heat exchange outlet which are communicated with each other, and a geothermal water inlet and a geothermal water outlet which are communicated with each other, the heat exchange inlet is communicated with the second hot water return inlet, the heat exchange outlet is communicated with the second hot water supply outlet, the heat exchange inlet is separated from the geothermal water inlet, and the heat exchange outlet is separated from the geothermal water outlet;
a geothermal production well in communication with the geothermal water inlet;
and the recharging well is communicated with the geothermal water outlet.
In one implementation of the disclosed embodiment, the heat exchange central station includes at least two heat exchangers;
the heat exchange inlets of the at least two heat exchangers are communicated, the heat exchange outlets of the at least two heat exchangers are communicated, the geothermal water inlets of the at least two heat exchangers are communicated, and the geothermal water outlets of the at least two heat exchangers are communicated.
In an implementation manner of the embodiment of the present disclosure, the heat exchange central station further includes:
and the first circulating pump is communicated with the heat exchange inlet and the second hot return water inlet.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
geothermal heating system's block heating plant connects between heat transfer central office and user heating equipment, block heating plant connects through first hot water supply inlet and heat transfer central office, receive the hot water supply of heat transfer central office output, and export for user heating equipment through first hot water supply outlet, the user utilizes hot water supply to keep warm, hot water supply temperature descends in this process, and export for block heating plant as the hot return water, flow back to by block heating plant's first hot return water inlet.
The hot backwater enters the heat pump through the first input port and the second input port, and the heat pump transfers the heat of the hot backwater input by the second input port to the hot backwater input by the first input port, so that the temperature of the hot backwater input by the first input port is raised to be used as hot water again, and the hot backwater is provided for the user heating equipment through the first output port and the first hot water supply outlet again. Correspondingly, the temperature of the hot backwater input from the second input port is further reduced, at the moment, the hot backwater input from the second input port is output to the heat exchange central station through the first hot backwater outlet, and heat exchange is carried out by the heat exchange central station, so that the temperature of the part of the hot backwater is increased to be used as hot water again, and the part of the hot backwater is provided for the user heating equipment through the second hot water supply outlet again.
In the process, due to the existence of the heat pump, the temperature of the hot backwater entering the heat exchange central station is lower than that of the related art, when the hot backwater is conveyed to the heat exchange central station from the second output port, the hot backwater can absorb more heat, the temperature of the geothermal water after heat exchange is reduced, namely, the temperature difference of the geothermal water before and after heat exchange is increased, under the condition that the water yield of the geothermal well is certain, the geothermal water transfers more heat to the hot backwater, the geothermal energy utilization rate is increased, the heat supply to a street can be met, more geothermal production wells do not need to be drilled to improve the yield of the geothermal water, the drilling investment is reduced, and the yield is increased.
In addition, the first output port is communicated with the first hot water supply inlet, the hot water supply output by the first output port exchanges heat through the heat pump, the temperature of the hot water supply output by the first output port is lower than that of the hot water supply input by the first hot water supply inlet, the temperature of the hot water supply output from the first hot water supply outlet can be reduced after the two parts of hot water supply are mixed, the first hot water supply outlet is communicated with the second hot water supply inlet of the user heat supply equipment, the temperature of the hot water supply entering the user heat supply equipment is reduced, and the heat supply temperature of the hot water supply is in the heat supply range required by a user.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a geothermal heating system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a geothermal heating system according to an embodiment of the disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a geothermal heating system according to an embodiment of the present disclosure. Referring to fig. 1, a geothermal heating system includes: a district heating station 10 and a heat exchange central station 20. Wherein, heat exchange central station 20 produces geothermal water to heat energy transfer is returned to the hot return water in street heating station 10, and the temperature of the hot return water in street heating station 10 risees the back and is supplied water as heat, and exports for the user, and the user heats through hot water supply.
The block heating plant 10 is provided with a first hot water supply inlet 11, a first hot water return outlet 12, a first hot water return inlet 13 and a first hot water supply outlet 14, wherein the first hot water supply inlet 11 is communicated with the first hot water supply outlet 14, and the first hot water return outlet 12 is communicated with the first hot water return inlet 13. The district heating plant 10 includes a heat pump 101, the heat pump 101 has a first input port 111 and a first output port 112 that communicate with each other, and a second input port 113 and a second output port 114 that communicate with each other, the first input port 111 and the second input port 113 communicate with a first hot return water inlet 13, respectively, the first output port 112 communicates with a first hot supply water inlet 11, and the second output port 114 communicates with a first hot return water outlet 12. In the heat pump 101, the first input port 111 and the second input port 113 are spaced apart from each other, and the first output port 112 and the second output port 114 are spaced apart from each other. The heat pump 101 is configured to lower the temperature of the hot return water output from the second output port 114 and to raise the temperature of the hot supply water output from the first output port 112.
The heat exchange central station 20 is provided with a second hot return water inlet 21 and a second hot water supply outlet 22, the second hot return water inlet 21 is communicated with the first hot return water outlet 12, and the second hot water supply outlet 22 is communicated with the first hot water supply inlet 11.
Geothermal heating system's block heating plant connects between heat transfer central office and user heating equipment, block heating plant connects through first hot water supply inlet and heat transfer central office, receive the hot water supply of heat transfer central office output, and export for user heating equipment through first hot water supply outlet, the user utilizes hot water supply to keep warm, hot water supply temperature descends in this process, and export for block heating plant as the hot return water, flow back to by block heating plant's first hot return water inlet.
The hot backwater enters the heat pump through the first input port and the second input port, and the heat pump transfers the heat of the hot backwater input by the second input port to the hot backwater input by the first input port, so that the temperature of the hot backwater input by the first input port is raised to be used as hot water again, and the hot backwater is provided for the user heating equipment through the first output port and the first hot water supply outlet again. Correspondingly, the temperature of the hot backwater input from the second input port is further reduced, at the moment, the hot backwater input from the second input port is output to the heat exchange central station through the first hot backwater outlet, and heat exchange is carried out by the heat exchange central station, so that the temperature of the part of the hot backwater is increased to be used as hot water again, and the part of the hot backwater is provided for the user heating equipment through the second hot water supply outlet again.
In the process, due to the existence of the heat pump, the temperature of the hot backwater entering the heat exchange central station is lower than that of the related art, when the hot backwater is conveyed to the heat exchange central station from the second output port, the hot backwater can absorb more heat, the temperature of the geothermal water after heat exchange is reduced, namely, the temperature difference of the geothermal water before and after heat exchange is increased, under the condition that the water yield of the geothermal well is certain, the geothermal water transfers more heat to the hot backwater, the geothermal energy utilization rate is increased, the heat supply to a street can be met, more geothermal production wells do not need to be drilled to improve the yield of the geothermal water, the drilling investment is reduced, and the yield is increased.
In addition, the first output port is communicated with the first hot water supply inlet, the hot water supply output by the first output port exchanges heat through the heat pump, the temperature of the hot water supply output by the first output port is lower than that of the hot water supply input by the first hot water supply inlet, the temperature of the hot water supply output from the first hot water supply outlet can be reduced after the two parts of hot water supply are mixed, the first hot water supply outlet is communicated with the second hot water supply inlet of the user heat supply equipment, the temperature of the hot water supply entering the user heat supply equipment is reduced, and the heat supply temperature of the hot water supply is in the heat supply range required by a user.
In the disclosed embodiment, the temperature of the hot water supply is high, and the user warms up by the hot water supply. The temperature is reduced after the heat supply of the hot water is supplied and then is used as the hot backwater.
In the embodiment of the present disclosure, after being heated by the heat exchange central station 20, the heated water flows to the district heating station 10 through the first hot water supply inlet 11, and then flows to the user heating equipment through the first hot water supply outlet 14 to supply hot water. The hot backwater flows to the block heating station 10 through the first hot backwater inlet 13, and then flows to the heat exchange central station 20 through the first hot backwater outlet 12. While the temperature of the hot feed water output from the first output port 112 is increased, it may also be referred to as hot feed water.
In the embodiment of the disclosure, the heat pump 101 only transfers the heat of the hot backwater input from the second input port 113 to the hot backwater input from the first input port 111, so that the temperature of the hot backwater input from the second input port 113 is reduced, and the temperature of the hot backwater input from the first input port 111 is increased. The temperature of the hot return water input from the second input port 113 is reduced and then output to the heat exchange central station to exchange heat with geothermal water, and the heat exchanger of the geothermal heat supply system usually works under the minimum heat exchange end difference, so the temperature of the geothermal water can be reduced by the hot return water with lower temperature, more heat can be provided for the heat supply system under the condition that the water yield of the geothermal well is certain, and the utilization rate of the geothermal energy is relatively increased.
In the embodiment of the disclosure, the heat exchange end difference refers to a temperature difference between the temperature of the hot return water input into the heat exchanger and the hot supply water output from the water heater. The minimum heat exchange end difference refers to the minimum temperature difference between the heat return water and the heat supply water of the heat exchanger.
In the embodiment of the present disclosure, the temperature of the hot water supplied after heat exchange by the heat exchange central station 20 is higher than the temperature of the hot water supplied by the high temperature user. The temperature of the hot feed water output from the first output port 112 may be adjusted by a heat pump. After the hot water supplied from the first output port 112 is mixed with the hot water supplied from the first hot water supply inlet 11, the temperature of the hot water supply meets the requirement of a high-temperature user, and the hot water supply can be directly supplied to the high-temperature user for use.
In the embodiment of the present disclosure, the high-temperature user means that the heating temperature is higher for, for example, the heating temperature is greater than 65 degrees celsius.
As shown in fig. 1, the first hot-water return inlet 13 is communicated with a first input port 111 and a second input port 113 through a pipe 100, respectively. The first hot water supply inlet 11 communicates with the first output port 112 through the pipe 100. The first hot return water outlet 12 is in communication with a second outlet 114 via a conduit 100.
Fig. 2 is a schematic structural diagram of a geothermal heating system according to an embodiment of the disclosure. Referring to fig. 2, the second input port 113 is provided with a first flow rate adjustment valve 115. For example, the first flow rate adjustment valve 115 may be disposed on the pipe 100 that communicates the first hot-water return inlet 13 and the second input port 113.
The first flow regulating valve 115 is used to regulate the flow of hot return water into the second input port 113. The flow rate Of the hot return water into the first input port 111 and the second input port 113 is controlled by the first flow rate adjustment valve 115, so as to adapt to the heat load adjustment Of the heat pump 101, and the heat pump is operated at a higher Coefficient Of Performance (COP).
Referring again to fig. 2, the first hot feed water outlet 14 includes: a first sub hot water supply outlet 141 and a second sub hot water supply outlet 142. The district heating plant 10 further includes: a water separator 102 and a pressure pump 103. The water separator 102 has a water separation inlet 121 and a water separation outlet 122, the water separation inlet 121 communicating with the first hot water supply inlet 11, and the water separation outlet 122 communicating with the first and second sub-hot water supply outlets 141 and 142. The pressurizing pump 103 communicates the water diversion outlet 122 and the second sub hot water supply outlet 142.
The hot water supply output from the heat exchange central station enters the water diversion inlet 121 from the first hot water supply inlet 11, is diverted by the water diverter 102 and then is output from the water diversion outlet 122, and the water diversion outlet 122 is provided with a plurality of output ports for respectively outputting the hot water supply to the first sub-hot water supply outlet 141 and the second sub-hot water supply outlet 142. The geothermal heating system provided by the disclosure supplies heat to residents in a community, and the pressure of the hot water supply provided when the heat is supplied to the residents on different floors is different. The pressure of the hot water supply provided when supplying heat to the residents on the high floors is higher, and the hot water supply can be ensured to enter the user heating equipment. The first sub hot water supply outlet 141 supplies hot water to the residents on the lower floors to supply heat. The pressurizing pump 103 pressurizes the hot feed water, increases the pressure of the hot feed water output from the second sub-hot feed water outlet 142, and outputs the hot feed water to the residents on the high floors to supply heat. Therefore, the geothermal heating system provided by the disclosure can supply heat to residents on low floors and high floors at the same time.
The hot water is pressurized by the pressurizing pump 103, and the traditional pressure supplementing device is replaced, so that the cost of the pressurizing pump 103 is lower than that of the traditional pressure supplementing device, and the investment of funds can be reduced.
As shown in fig. 2, the first hot water supply inlet 11 communicates with the water separator 102 through a pipe 100. And a second circulation pump 108 is disposed on the pipe 100 to drive the hot water supply to flow in the pipe 100, so that the entire geothermal heating system forms a circulating system. The lift provided by the second circulation pump 108 is used to overcome the total resistance loss of the district heating plant, the heating pipe network and the user, and the balance of the hot return water pressure of each district heating plant can be adjusted.
Referring again to fig. 2, the first hot water supply outlet 14 further includes a third sub-hot water supply outlet 143, and the third sub-hot water supply outlet 143 communicates with the divided water outlet 122.
In the disclosed embodiment, the user heating apparatus includes a radiator and a radiating coil, wherein the first sub hot water supply outlet 141 and the second sub hot water supply outlet 142 are communicated with an input port of the radiating coil, and the third sub hot water supply outlet 143 is communicated with an input port of the radiator. The heat supply equipment used by the high-temperature user is a radiator, and the heat supply equipment used by the low-temperature user is a radiating coil pipe.
As shown in fig. 2, water knockout vessel 102 includes three water knockout outlets 122, namely, a first sub-water knockout outlet 1221, a second sub-water knockout outlet 1222, and a third sub-water knockout outlet 1223, and first sub-water knockout outlet 1221, second sub-water knockout outlet 1222, and third sub-water knockout outlet 1223 are all in communication with water knockout inlet 121. The first sub-divided water outlet 1221 is communicated with the first sub-hot water supply outlet 141, the second sub-divided water outlet 1222 is communicated with the second sub-hot water supply outlet 142, and the third sub-divided water outlet 1223 is communicated with the third sub-hot water supply outlet 143.
Referring again to fig. 2, the first hot return water inlet 13 includes: a first sub-hot-water return inlet 131 and a second sub-hot-water return inlet 132. The district heating plant 10 further includes: a water collector 104. The water collector 104 has a water collecting inlet 1041 and a water collecting outlet 1042, the water collecting inlet 1041 is respectively communicated with the first sub hot return inlet 131 and the second sub hot return inlet 132, and the water collecting outlet 1042 is respectively communicated with the first input port 111 and the second input port 113. The first sub-hot-water return inlet 131 and the second sub-hot-water return inlet 132 are communicated with an output port of the heat dissipation coil.
The hot backwater in the heat dissipation coil pipes of residents on different floors is output to the water collection inlet 1041 through the first sub-hot backwater inlet 131 and the second sub-hot backwater inlet 132, and the hot meeting water enters the water collector 104 to be mixed and then is output to the first input port 111 and the second input port 113 through the water collection outlet 1042. The hot return water after heat supply of different floors is output to the first input port 111 and the second input port 113 of the heat pump 101 through the water collector 104, and finally heat exchange is carried out again, so that the heat pump is more convenient.
Referring again to fig. 2, the district heating plant 10 further includes: a pressure reducing device 107. The pressure reducing device 107 is communicated with the water collecting inlet 1041 and the second sub-hot-water return inlet 132. The water collecting inlet 1041 and the second sub-hot return water inlet 132 are communicated through a pipe 100, and for example, the pressure reducing device 107 may be disposed on the pipe 100 communicating the water collecting inlet 1041 and the second sub-hot return water inlet 132.
The second sub-hot return water inlet 132 is communicated with the first sub-hot return water inlet 131 through the water collector 104, hot return water input from the second sub-hot return water inlet 132 is hot return water after heat supply of high-rise residents, the pressure of the hot return water is high, the hot return water is directly output to the water collector 104 through the water collecting inlet 1041, the hot return water with high pressure may damage heat supply equipment of low-rise residents through the first sub-hot return water inlet 131, the pressure reducing device 107 is arranged on the pipeline 100 communicating the water collecting inlet 1041 with the second sub-hot return water inlet 132, the pressure of the hot return water is reduced, and damage to the heat supply equipment of the low-rise residents due to too high pressure is avoided.
As shown in fig. 2, the first hot return water inlet 13 further includes a third sub-hot return water inlet 133, and the third sub-hot return water inlet 133 is communicated with the water collecting inlet 1041.
For the users of the radiator, the hot backwater after the heat supply is finished enters the water collector 104 through the third sub-hot backwater inlet 133 to be mixed, and then is output to the first input port 111 and the second input port 113 of the heat pump 101, and finally heat exchange is carried out again.
As shown in fig. 2, the water collector 104 includes three water collection inlets 1041, respectively a first subset of water inlets 1043, a second subset of water inlets 1044 and a third subset of water inlets 1045, the first subset of water inlets 1043, the second subset of water inlets 1044 and the third subset of water inlets 1045 all communicating with the water collection outlet 1042. The first sub-hot return water inlet 131 is communicated with the first sub-set water inlet 1043, the second sub-hot return water inlet 132 is communicated with the second sub-set water inlet 1044, and the third sub-hot return water inlet 133 is communicated with the third sub-set water inlet 1045.
Referring again to fig. 2, the district heating plant 10 further includes: a first mixing pump 105 and a second mixing pump 106. The first mixing pump 105 communicates the first sub hot-water return inlet 131 and the first sub hot-water supply outlet 141. The second mixing pump 106 communicates the second sub-hot-return water inlet 132 and the second sub-hot-supply water outlet 142. The first sub-hot-return water inlet 131 and the first sub-hot-supply water outlet 141 may be communicated through the pipe 100, and the second sub-hot-return water inlet 132 and the second sub-hot-supply water outlet 142 may be communicated through the pipe 100. For example, the first mixing pump 105 may be disposed on the pipe 100 communicating the first sub hot-water return inlet 131 and the first sub hot-water supply outlet 141, and the second mixing pump 106 may be disposed on the pipe 100 communicating the second sub hot-water return inlet 132 and the second sub hot-water supply outlet 142.
In the embodiment of the present disclosure, the temperature of the hot water supplied after heat exchange through the heat exchange central station 20 is high, and although the temperature of the hot water supplied after mixing with the hot water supplied from the first output port 112 is reduced, the temperature may be high relative to the temperature of the hot water supplied. The hot return water input from the first sub-hot return water inlet 131 and the second sub-hot return water inlet 132 has a low temperature. Outputting the hot backwater, which has been supplied with the reduced temperature, to the first sub hot water supply outlet 141 by the first water mixing pump 105, so that the temperature of the hot water supply outputted from the first sub hot water supply outlet 141 to the resident of the lower floor is reduced; the hot backwater with the reduced temperature after the heat supply is finished is output to the second sub-hot water supply outlet 142 through the second water mixing pump 106, so that the temperature of the hot water supplied to the high-rise resident from the second sub-hot water supply outlet 142 is reduced, and scalding accidents are avoided.
In the embodiment of the present disclosure, the first mixing pump 105 and the second mixing pump 106 may supplement the hot backwater to the first sub hot water supply outlet 141 and the second sub hot water supply outlet 142, respectively, instead of the water supplement device in the related art.
In the embodiment of the present disclosure, the hot return water and the hot supply water are directly contacted and mixed by the first mixing pump 105 and the second mixing pump 106 to exchange heat, and the heat exchange mode is direct heat exchange.
As shown in fig. 2, the third sub hot-water supply outlet 143 is not communicated with the third sub hot-water return inlet 133. In other implementations, a mixing pump may also be arranged to communicate the third sub hot water supply outlet 143 with the third sub hot water return inlet 133.
As shown in fig. 2, a second flow rate regulating valve 109 is disposed on the pipe 100 communicating the first sub hot water supply outlet 141 and the branched water outlet 122, and the flow rate of the hot water supply outputted to the first sub hot water supply outlet 141 is regulated by the second flow rate regulating valve 109. When the user needs to increase the heating temperature, the valve opening degree of the second flow rate adjustment valve 109 may be opened large so that more hot supply water flows out from the first sub-hot supply water outlet 141 for heating.
Of course, flow rate adjusting valves are also disposed on the pipe 100 communicating the second sub hot water supply outlet 142 and the divided water outlet 122, and the pipe 100 communicating the third sub hot water supply outlet 143 and the divided water outlet 122, for controlling the temperature of the supplied heat.
The first sub-divided water outlet 1221 is communicated with the first sub-hot water supply outlet 141, and supplies hot water at a high temperature and a low pressure to users of the street radiators. The second sub water distribution outlet 1222 pressurizes the hot water supply through the pressurizing pump 103, mixes with the hot water supply at the outlet of the second water mixing pump 106 to form low-temperature and high-pressure hot water supply, and delivers the low-temperature and high-pressure hot water supply to the users at the high floors in the block through the second sub hot water supply outlet 142 for supplying heat. The third sub-water distribution outlet 1223 adjusts the flow rate through the second flow control valve 109, mixes with the hot water supply at the outlet of the first water mixing pump 105 to form low-temperature and low-pressure hot water supply, and delivers the low-temperature and low-pressure hot water supply to the users at the low floors of the street through the third sub-hot water supply outlet 143 for supplying heat.
Hot backwater of users at high floors in the street enters the first sub-hot backwater inlet 131, a part of the hot backwater enters the second water mixing pump 106 and is mixed with hot water at the outlet of the pressure pump 103 to form low-temperature and high-pressure hot water, and the low-temperature and high-pressure hot water is supplied to the users at the high floors in the street again, and the other part of the hot backwater is decompressed by the decompressor 107 and then enters the water collector 104 through the first sub-hot backwater inlet 1043. Hot backwater of users at low floors in the street is fed into the second sub-hot backwater inlet 132, a part of the hot backwater is fed into the first water mixing pump 105 and mixed with hot water at the outlet of the second flow regulating valve 109 to form low-temperature and low-pressure hot water, and the low-temperature and low-pressure hot water is fed to the users at low floors in the street again, and the other part of the hot backwater enters the water collector 104 through the second sub-water inlet 1044. The hot backwater of the user of the high-temperature and low-pressure radiator in the block enters the third sub-hot backwater inlet 133 and then enters the water collector 104. Therefore, a set of multi-temperature-position and multi-pressure heating system is established between the block heating station and the block users, and the heat utilization requirements of each floor area and various users in the block can be met.
Illustratively, the user may be a user who warms by floor heating.
Referring again to fig. 2, the heat exchange central station 20 includes: heat exchanger 201, geothermal production well 202 and recharge well 203. The heat exchanger 201 is provided with a heat exchange inlet 211 and a heat exchange outlet 212 which are communicated with each other, and a geothermal water inlet 213 and a geothermal water outlet 214 which are communicated with each other, wherein the heat exchange inlet 211 is communicated with the second hot water return inlet 21, the heat exchange outlet 212 is communicated with the second hot water supply outlet 22, the heat exchange inlet 211 is separated from the geothermal water inlet 213, and the heat exchange outlet 212 is separated from the geothermal water outlet 214. The geothermal production well 202 communicates with a geothermal water inlet 213 and the recharge well 203 communicates with a geothermal water outlet 214.
The geothermal production well 202 is used for producing geothermal water, the geothermal water enters the heat exchanger 201 through the geothermal water inlet 213 and exchanges heat with the hot return water entering from the heat exchange inlet 211, and after the temperature of the hot return water rises, the geothermal water is called hot water and flows to the block heating station 10 from the heat exchange outlet 212, and finally heat supply is carried out. The geothermal water is cooled after heat exchange, and flows to the recharging well 203 from the geothermal water outlet 214 to be heated again.
In the disclosed embodiment, the geothermal production well 202 and the recharge well 203 are interconnected to achieve geothermal water production and recharge balance.
In the embodiment of the present disclosure, heat exchange is performed between geothermal water and hot return water through the heat exchanger 201, that is, geothermal water and hot return water are not in direct contact, and the heat exchange mode is indirect heat exchange.
As shown in fig. 2, the geothermal production well 202 communicates with the geothermal water inlet 213 through a geothermal water pipe 200, and the recharge well 203 also communicates with the geothermal water outlet 214 through the geothermal water pipe 200.
In the disclosed embodiment, the heat exchanger 201 may be disposed near the geothermal production well 202 and the recharge well 203 such that the geothermal water pipe 200 communicating the geothermal production well 202 and the geothermal water inlet 213, and the geothermal water pipe 200 communicating the recharge well 203 and the geothermal water outlet 214 are shorter. Because geothermal water's quality of water is relatively poor, and has corrosivity, reduce geothermal water pipe 200's length, can reduce geothermal water to geothermal water pipe 200's corruption, reduce geothermal water leakage's risk, also can reduce the risk that geothermal water's impurity and incrustation scale blockked up geothermal water pipe 200. Thereby greatly reducing the maintenance workload of the geothermal water pipeline. The operation and maintenance cost is reduced, and the safe and stable operation of the heating system is ensured. Meanwhile, since the possibility of corrosion, clogging and scaling of the pipe 100 is reduced, it is not necessary to provide a water softening system for softening the geothermal water, thereby reducing the investment in equipment.
In the embodiment of the present disclosure, the temperature of the hot water supplied from the heat exchange central station 20 to the district heating station 10 is increased, and the flow rate of the hot water supplied can be reduced under the condition that the heat supply temperature is not changed, so that the pipe diameter of the pipe connecting the heat exchange central station 20 and the district heating station 10 can be reduced.
As shown in fig. 2, the heat exchange central station 20 includes two heat exchangers 201. The heat exchange inlets 211 of the two heat exchangers 201 are communicated, the heat exchange outlets 212 of the two heat exchangers are communicated, the geothermal water inlets 213 of the two heat exchangers are communicated, and the geothermal water outlets 214 of the two heat exchangers are communicated. Two heat exchangers 201 are arranged to increase the heat exchange effect.
In other implementations, the heat exchange central station 20 may include other numbers of heat exchangers 201, as the present disclosure is not limited thereto.
As shown in fig. 2, the heat exchange central station 20 further includes a hot first circulation pump 204. The hot first circulating pump 204 is communicated with the heat exchange inlet 211 and the second hot water return inlet 21. The heat exchange inlet 211 is communicated with the second hot return water inlet 21 through a pipeline 100. The first circulation pump 204 is used for overcoming the total resistance loss inside the heat exchange central station and between the heat exchange central station and the district heating station.
As shown in fig. 2, a geothermal water well pump 221 is provided in the geothermal production well 202 to output geothermal water to the geothermal water inlet 213.
In the geothermal heating system provided by the embodiment of the present disclosure, the heat exchange central station 20 can provide heat sources to a plurality of block heating stations, and a town or regional concentrated geothermal heating system is composed of one heat exchange central station and a plurality of block heating stations.
As shown in fig. 2, the heat exchange central station 20 can output hot water supply to the district heating stations of other districts through a pipe 100 between the heat exchange central station 20 and the district heating stations 10.
In fig. 2, a portion of the conduit 100 is disconnected, and in practice the conduit 100 is not disconnected. Where a conduit is disconnected means that the two conduits are staggered there, but not connected.
The geothermal heating system of the present disclosure is described as an engineering example below:
engineering example basic data: the geothermal water produced by the geothermal production well 202 produces 100 cubic meters per hour (m)3H), the temperature of the geothermal water is 90 ℃ (DEG C); recharge well 203 recharge capacity 100m3H; the heat load of the radiator user was 2.2 Megawatts (MW), the heat usage temperature was 75/50 ℃ (where "/" front indicates the temperature before and "/" rear indicates the temperature after heating by the hot water supply); the heat load of floor heating users (1 to 12 floors) at the low floor is 6.8MW, and the using heat temperature is 50/40 ℃; the high floor heating users (13 floors to 26 floors) are thermally loaded at 8.0MW with a heat temperature of 50/40 ℃.
Geothermal water is pressurized by a geothermal water well pump in a geothermal production well (the temperature is 90 ℃, the flow rate is 170 tons per hour (t/h), and the pressure is 0.5 megapascal (MPa)) and is sent into a geothermal water pipeline 200, the geothermal water is sent to a geothermal water inlet 213 of a heat exchanger 201 through the geothermal water pipeline 200, heat exchange is carried out with hot return water (the temperature is 21 ℃, the flow rate is 176t/h, and the pressure is 0.6MPa) entering from a heat exchange inlet 211, and the geothermal water after heat exchange (the temperature is 24 ℃, the flow rate is 170t/h, and the pressure is 0.4MPa) is sent into a recharging well 203 through the geothermal water pipeline 200. The hot backwater becomes hot water after heat exchange and temperature rise (temperature: 85 ℃, flow: 176t/h, pressure: 0.6MPa), and flows from the heat exchange outlet 212 to the first hot water supply inlet 11.
In the district heating plant, the hot water (temperature: 85 ℃, flow: 176t/h, pressure: 0.6MPa) after heat exchange and temperature rise is mixed with the hot water (temperature: 60 ℃, flow: 264t/h, pressure: 0.45MPa) output by the first output port 112 of the heat pump 101, the hot water (temperature: 75 ℃, flow: 440t/h, pressure: 0.45MPa) with the temperature reduced is pressurized by the second circulating pump 108, and then the hot water (temperature: 75 ℃, flow: 440t/h, pressure: 0.6MPa) enters the water separator 102. Three hot water supplies are led out of the water separator 102:
the first path of hot water supply (the temperature is 75 ℃, the flow rate is 167t/h, and the pressure is 0.6MPa) is mixed with the hot return water (the temperature is 40 ℃, the flow rate is 418t/h, and the pressure is 0.6MPa) at the water outlet side of the first water mixing pump 105, then the mixture is cooled, and the cooled hot water supply (the temperature is 50 ℃, the flow rate is 585t/h, and the pressure is 0.6MPa) enters the first sub-hot water supply outlet 141 to supply heat for the floor heating users of the low floors.
The second path of hot water supply (the temperature is 75 ℃, the flow rate is 197t/h, and the pressure is 0.6MPa) firstly enters the pressurizing pump 103 for pressurization, the pressurized hot water supply (the temperature is 75 ℃, the flow rate is 197t/h, and the pressure is 0.95MPa) is mixed with the hot return water (the temperature is 40 ℃, the flow rate is 491t/h, and the pressure is 0.95MPa) at the water outlet side of the second water mixing pump 106 for cooling, and the cooled hot water supply (the temperature is 50 ℃, the flow rate is 688t/h, and the pressure is 0.95MPa) enters the second sub-hot water supply outlet 142 for supplying heat for floor heating users at high floors.
The third path of hot water supply (the temperature is 75 ℃, the flow rate is 76t/h, and the pressure is 0.6MPa) supplies heat for the heating users of the radiators through a third sub-hot water supply outlet 143.
After the heat supply for the floor heating users of the low floor is finished, the temperature is reduced to form hot backwater (the temperature is 40 ℃, the flow is 585t/h, and the pressure is 0.45MPa) to enter the first sub-hot backwater inlet 131. Part of the hot return water (the temperature: 40 ℃, the flow rate: 418t/h, and the pressure: 0.45MPa) enters the first water mixing pump 105 to be pressurized, and the pressurized hot return water (the temperature: 40 ℃, the flow rate: 418t/h, and the pressure: 0.6MPa) is mixed with the first hot supply water (the temperature: 75 ℃, the flow rate: 167t/h, and the pressure: 0.6MPa) to supply heat. The other part of the hot return water (temperature: 40 ℃, flow: 197t/h, pressure: 0.45MPa) enters the water collector 104.
After the heat supply for the floor heating users of the high floors is finished, the hot water supply enters the second sub-hot-return-water inlet 132 after the temperature is reduced (the temperature is 40 ℃, the flow is 688t/h, and the pressure is 0.8 MPa). Part of the hot return water (the temperature: 40 ℃, the flow rate: 491t/h, and the pressure: 0.8MPa) enters the second water mixing pump 106 to be pressurized, and the pressurized hot return water (the temperature: 40 ℃, the flow rate: 491t/h, and the pressure: 0.95MPa) is mixed with the hot water supply (the temperature: 75 ℃, the flow rate: 197t/h, and the pressure: 0.95MPa) at the water outlet side of the pressurizing pump 103 to supply heat. The other part of the hot return water (temperature: 40 ℃, flow: 197t/h, pressure: 0.8MPa) is decompressed by the decompression device 107, and the decompressed hot return water (temperature: 40 ℃, flow: 197t/h, pressure: 0.45MPa) enters the water collector 104.
After the heat supply for the heating users of the radiator is finished, the temperature is reduced to form hot backwater (the temperature is 50 ℃, the flow is 76t/h, and the pressure is 0.45MPa) which enters the water collector 104 through the third sub-hot backwater inlet 133.
After the three paths of hot backwater are mixed in the water collector 104, the mixed hot backwater (the temperature: 42 ℃, the flow: 440t/h, and the pressure: 0.45MPa) enters the water collection outlet 1042. A part of hot return water (temperature: 42 ℃, flow: 264t/h, pressure: 0.45MPa) enters the heat pump 101 through the first input port 111, the heat pump 101 raises the temperature of the hot return water (temperature: 42 ℃, flow: 264t/h, pressure: 0.45MPa) entering from the first input port 111, and the hot return water after the temperature rise is output from the first output port 112 and mixed with hot supply water (temperature: 85 ℃, flow: 176t/h, pressure: 0.6MPa) flowing from the first hot supply water inlet 11. The other part of the hot return water (the temperature: 42 ℃, the flow rate: 176t/h, and the pressure: 0.45MPa) enters the heat pump 101 through the second input port 113, the heat pump 101 reduces the temperature of the hot return water (the temperature: 42 ℃, the flow rate: 176t/h, and the pressure: 0.45MPa) from the second input port 113, the hot return water (the temperature: 21 ℃, the flow rate: 176t/h, and the pressure: 0.45MPa) with the reduced temperature is output from the second output port 114, enters the first hot return water outlet 12, and recently enters the heat exchanger 201 for heat exchange and temperature rise, so that circulation is performed.
According to the engineering example, by using the geothermal heat supply system provided by the disclosure, only 2 geothermal production wells and 2 recharging wells are needed, the geothermal water is recharged nearby, the difference between the output temperature and the input temperature of the geothermal water reaches 64 ℃, and the heat supply of the high-temperature low-pressure end equipment, the low-temperature high-pressure end equipment and the low-temperature low-pressure end equipment is realized under the condition that a heat exchanger is not adopted in a block heating station. Through calculation, if the traditional geothermal heating system is adopted in the engineering example, the geothermal water demand is 325t/h, 4 geothermal production wells and 4 recharging wells are needed, the difference between the output temperature and the input temperature of geothermal water is only 45 ℃, 3 sets of plate type heat exchange systems, 2 sets of water supplementing and pressure stabilizing systems and 1 set of water treatment systems are needed to be arranged in a block heating station, and the total engineering investment can be obviously improved. Therefore, the geothermal heating system provided by the disclosure can reduce the investment cost of the geothermal heating system.
The embodiment of the disclosure provides a geothermal heating system for improving the utilization rate of geothermal heat, which extracts geothermal water heat by arranging a heat exchanger near a geothermal production well and conveys the geothermal water heat to a block heating station for heating. The heat pump is adopted in the block heat supply station to reduce the temperature of the hot return water entering the heat exchange central station, so that the hot return water can absorb more heat, the recharge temperature of geothermal water is reduced, and the geothermal utilization rate is improved; meanwhile, the geothermal heating system combines the heating processes of direct heating, indirect heating, water mixing and pressurization and the like to realize multi-temperature-position high-low pressure heating, and effectively solves the problem that various user heating equipment on high and low floors need to be provided with a plurality of sets of heat sources.
In addition, the heat exchanger is arranged near the geothermal production well, geothermal water can be recharged nearby, the length of a pipeline for conveying the geothermal water is effectively shortened, the generation of harmful factors such as pipeline corrosion, scaling and blockage is reduced, and the leakage risk of the geothermal water is reduced. Meanwhile, the method cancels a plate type heat exchange device, a water supplementing constant pressure device and a softened water treatment device of the conventional block heat supply station, simplifies the process flow of the block heat supply station, and compared with the traditional plate type heat exchanger heat supply system, realizes the non-end difference heat supply of the block heat supply station. The heat pump and the first flow regulating valve are arranged at the block heating station, and the heat return treatment is carried out on part of the hot return water, so that the return water temperature of the hot return water is reduced, the temperature difference before and after geothermal water is input is increased, the pipe diameter of a pipeline for conveying hot water supply is reduced, and the number of production wells and recharge wells is reduced. Meanwhile, the process system is simple, the operation energy consumption is low, the maintenance workload is small, the occupied area is small, the total investment and the operation cost of the project can be reduced, and the benefit of the geothermal heat supply project is improved.
The beneficial effects brought by the embodiment of the disclosure at least include:
1. the geothermal heating system provided by the embodiment of the disclosure improves the utilization rate of geothermal heat and reduces the number of production wells and recharge wells; the temperature difference before and after geothermal water is input is increased, and the pipe diameter of a pipeline for conveying hot water is reduced; the process flow of the street heating station is simplified, and the floor area of the street heating station is reduced; the total investment of the project is reduced.
2. The geothermal heating system provided by the embodiment of the disclosure recharges geothermal water nearby, shortens the length of a pipeline for conveying geothermal water, reduces the generation of harmful factors such as pipeline corrosion, scaling and blockage, reduces the leakage risk of geothermal water, has small maintenance workload, reduces the operation and maintenance cost, and ensures the safe and stable operation of the heating system.
3. The geothermal heating system provided by the embodiment of the disclosure can realize multi-temperature-position high-low pressure heating, ensure the temperature requirements of various user heating devices and improve the heating effect.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims (10)

1. A geothermal heating system, comprising: a block heating station (10) and a heat exchange central station (20);
street heating plant (10) have first hot water supply entry (11), first hot return water export (12) and be used for with first hot return water entry (13) and first hot water supply export (14) of user's heating equipment intercommunication, first hot water supply entry (11) with first hot water supply export (14) intercommunication, first hot return water export (12) with first hot return water entry (13) intercommunication, street heating plant (10) include:
the heat pump (101) is provided with a first input port (111) and a first output port (112) which are communicated with each other, and a second input port (113) and a second output port (114) which are communicated with each other, the first input port (111) and the second input port (113) are respectively communicated with the first hot return water inlet (13), the first output port (112) is communicated with the first hot supply water inlet (11), and the second output port (114) is communicated with the first hot return water outlet (12); -within the heat pump (101), the first input port (111) and the second input port (113) are spaced from each other, the first output port (112) and the second output port (114) are spaced from each other, the heat pump (101) being configured to reduce the temperature of the hot return water output from the second output port (114), and to increase the temperature of the hot supply water output from the first output port (112);
the heat exchange central station (20) is provided with a second hot backwater inlet (21) and a second hot water supply outlet (22), the second hot backwater inlet (21) is communicated with the first hot backwater outlet (12), and the second hot water supply outlet (22) is communicated with the first hot water supply inlet (11).
2. A geothermal heating system according to claim 1, wherein the second input (113) of the heat pump (101) is provided with a first flow regulating valve (115).
3. A geothermal heating system according to claim 1, wherein the first hot water supply outlet (14) comprises: a first sub hot water supply outlet (141) and a second sub hot water supply outlet (142);
the district heating plant (10) further comprises:
a water separator (102) having a water separation inlet (121) and a water separation outlet (122), the water separation inlet (121) communicating with the first hot water supply inlet (11), the water separation outlet (122) communicating with the first sub hot water supply outlet (141) and the second sub hot water supply outlet (142);
and a pressurizing pump (103) communicating the water diversion outlet (122) and the second sub hot water supply outlet (142).
4. A geothermal heating system according to claim 3, wherein the first hot return water inlet (13) comprises: a first sub-hot-return inlet (131) and a second sub-hot-return inlet (132);
the district heating plant (10) further comprises:
the water collector (104) is provided with a water collecting inlet (1041) and a water collecting outlet (1042), the water collecting inlet (1041) is communicated with the first sub-hot-water return inlet (131) and the second sub-hot-water return inlet (132) respectively, and the water collecting outlet (1042) is communicated with the first input port (111) and the second input port (113) respectively.
5. A geothermal heating system according to claim 4, wherein the district heating plant (10) further comprises:
a first water mixing pump (105) communicating the first sub-hot water return inlet (131) and the first sub-hot water supply outlet (141);
and the second water mixing pump (106) is communicated with the second sub hot return water inlet (132) and the second sub hot water supply outlet (142).
6. A geothermal heating system according to claim 4, wherein the district heating plant (10) further comprises:
and the pressure reducing device (107) is communicated with the water collecting inlet (1041) and the second sub-hot return water inlet (132).
7. A geothermal heating system according to claim 4, wherein the first hot water supply outlet (14) further comprises a third sub-hot water supply outlet (143), the third sub-hot water supply outlet (143) being in communication with the tap outlet (122);
the first hot return water inlet (13) further comprises a third sub-hot return water inlet (133), and the third sub-hot return water inlet (133) is communicated with the water collecting inlet (1041).
8. A geothermal heating system according to any one of claims 1 to 7, wherein the heat exchange central station (20) comprises:
a heat exchanger (201) which is provided with a heat exchange inlet (211) and a heat exchange outlet (212) which are communicated with each other, and a geothermal water inlet (213) and a geothermal water outlet (214) which are communicated with each other, wherein the heat exchange inlet (211) is communicated with the second hot water return inlet (21), the heat exchange outlet (212) is communicated with the second hot water supply outlet (22), the heat exchange inlet (211) is separated from the geothermal water inlet (213), and the heat exchange outlet (212) is separated from the geothermal water outlet (214);
a geothermal production well (202) in communication with the geothermal water inlet (213);
a recharge well (203) in communication with the geothermal water outlet (214).
9. A geothermal heating system according to claim 8, wherein the heat exchange central station (20) comprises at least two heat exchangers (201);
the heat exchange inlets (211) of the at least two heat exchangers (201) are communicated, the heat exchange outlets (212) of the at least two heat exchangers are communicated, the geothermal water inlets (213) of the at least two heat exchangers (201) are communicated, and the geothermal water outlets (214) of the at least two heat exchangers (201) are communicated.
10. A geothermal heating system according to claim 8, wherein the heat exchange central station (20) further comprises:
and the first circulating pump (204) is communicated with the heat exchange inlet (211) and the second hot water return inlet (21).
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