CN111878168B - Method and system for storing natural gas and supplying heat by using abandoned mine - Google Patents
Method and system for storing natural gas and supplying heat by using abandoned mine Download PDFInfo
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- CN111878168B CN111878168B CN202010657389.2A CN202010657389A CN111878168B CN 111878168 B CN111878168 B CN 111878168B CN 202010657389 A CN202010657389 A CN 202010657389A CN 111878168 B CN111878168 B CN 111878168B
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- natural gas
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
Abstract
A system for storing natural gas and supplying heat by utilizing a abandoned mine comprises a waste gas mine, a gas source heat pump and a heat exchange system, wherein the waste gas mine is provided with a goaf, a natural gas injection well and a natural gas extraction well, the natural gas injection well and the natural gas extraction well are both communicated with the goaf, underground safety valves are respectively arranged in the natural gas injection well, and a gas inlet end of the gas source heat pump is communicated with the natural gas injection well, so that the full utilization of waste gas mine resources can be realized, the problem of resource waste caused by abandoned coal mines in the prior art is effectively solved, the repeated utilization rate of the abandoned mine is improved, and the transformation development of resource-exhausted cities is promoted; the natural gas storage device can store excessive natural gas in summer and take out the excessive natural gas in winter, so that the storage space of the natural gas is enlarged, the pressure of natural gas in the peak period of natural gas demand can be effectively relieved, and more economic benefits are brought.
Description
Technical Field
The invention belongs to the field of new energy development and application, and relates to a method and a system for storing natural gas and supplying heat by using an abandoned mine.
Background
Natural gas has the advantages of low price, environmental protection and the like, is the main domestic fuel of residents at present, and is a trend slowly by adopting natural gas for heating. However, natural gas heating is mostly concentrated in winter, which causes the supply and demand of natural gas to rapidly rise in winter, and the phenomenon of insufficient natural gas storage is easy to occur, while the demand of natural gas in summer is significantly lower than that in winter, the phenomenon of excessive natural gas storage can occur. In addition, the air source heat pump is the most widely applied heat pump system at present, and due to the fact that the north is cold in winter, the heat pump efficiency is greatly reduced along with the reduction of outdoor temperature.
In recent years, the number of abandoned coal mines is in an ascending state all the time, the goaf (11) of the abandoned coal mine is stable, the space maintenance condition is good, the roof does not collapse under most conditions, and the scope of the goaf (11) is large. However, at present, a large number of abandoned coal mines are in a abandoned state, and underground space parts of the abandoned coal mines are not fully utilized, so that waste of resources of the abandoned coal mines is caused. The abandoned coal mine is usually located in the deep underground part, the temperature of gas released from the abandoned coal mine is high, but the heat of the abandoned coal mine is not utilized at present, and the waste of heat energy resources is also caused.
Disclosure of Invention
In view of the above, the present invention provides a method for storing natural gas and heating by using abandoned mine.
The invention provides a method for storing natural gas and supplying heat by using a waste mine, which mainly comprises the following steps:
s1, selecting a target abandoned mine, and acquiring geological environment information of a goaf in the abandoned mine;
s2, cleaning the abandoned mine, plugging a shaft of the abandoned mine and cracks caused by excavation in the shaft, detecting the air tightness of the goaf, if the air tightness in the goaf is good, carrying out the next step, if the air tightness in the goaf is poor, continuously checking whether each shaft of the abandoned mine and the cracks in the shaft are tightly plugged or not until the air tightness in the goaf is good;
s3, judging the maximum pressure bearing capacity of the goaf, and acquiring the maximum storage capacity information of the gas storage;
s4, respectively drilling a natural gas injection well, a natural gas production well and a natural gas detection well above the goaf, wherein the natural gas injection well and the natural gas production well are communicated with the goaf, the natural gas detection well is not communicated with the goaf, underground safety valves are respectively arranged in the natural gas injection well and the natural gas production well, and natural gas is input into the goaf through the natural gas injection well, so that the natural gas can be stored in the goaf;
s5, connecting an air source heat pump outside the natural gas recovery well, extracting high-temperature natural gas in the goaf to the air source heat pump through the natural gas recovery well, liquefying the high-temperature natural gas by the air source heat pump, and then conveying the high-temperature natural gas to a heat exchange system, wherein the heat exchange system extracts heat in the liquefied natural gas and conveys the heat to an indoor floor heating coil of a resident, and the liquefied natural gas is conveyed to a natural gas conveying pipeline of the resident to realize heating.
Further, the geological environment information in S1 includes parameter information of the distribution position, size, shape and boundary of the gob.
Further, in S2, sealing of the shaft and the crack is achieved by covering a sealing plate, spraying ultrafine concrete or spraying a sealing material.
The utility model provides an utilize abandonment mine to store natural gas and heating system, includes waste gas mine, air supply heat pump and heat exchange system, the waste gas mine has collecting space area, natural gas injection well and natural gas recovery well, the natural gas injection well with natural gas recovery well all with collecting space area intercommunication, and all dispose the relief valve in it, the inlet end of air supply heat pump with natural gas recovery well intercommunication, heat exchange system has first feed end, first discharge end and second discharge end, its first feed end with the first liquid outlet intercommunication of air supply heat pump, its first discharge end and resident indoor ground heating coil intercommunication, second feed end and resident's natural gas conveying pipeline intercommunication.
Furthermore, the waste gas mine is also provided with a natural gas detection well which is mutually independent from the natural gas injection well and the natural gas extraction well and is not communicated with the goaf, and the natural gas detection well is used for detecting whether natural gas leaks.
Further, heat exchange system includes water heat exchanger and evaporimeter, water heat exchanger's first feed liquor end with the first liquid outlet intercommunication of air supply heat pump, its second goes out the liquid end and is connected with resident indoor floor heating coil's second inlet, its third play liquid end with the third liquid inlet of evaporimeter is connected, the gas outlet and the resident natural gas pipeline intercommunication of evaporimeter.
Furthermore, the heat exchange system further comprises a water pump, a valve and an electronic expansion valve, wherein the water pump and the valve are respectively arranged at the second liquid outlet end of the water heat exchanger, and the electronic expansion valve is arranged at the third liquid outlet end of the water heat exchanger.
The technical scheme provided by the invention has the beneficial effects that: the method and the system for storing natural gas and supplying heat by using the abandoned mine have the following advantages:
1) according to the method for storing and heating natural gas by using the abandoned mine, the underground space part of the abandoned mine is used for storing natural gas, so that the full utilization of waste gas mine resources is realized, the problem of resource waste caused by abandoned coal mines in the prior art is effectively solved, the repeated utilization rate of the abandoned mine is improved, and the transformation development of resource-exhausted cities is promoted; the natural gas surplus in summer can be stored and taken out in winter, so that the storage space of the natural gas is enlarged, the supply pressure of the natural gas in the peak period of the demand can be effectively relieved, and more economic benefits are brought;
2) the method for storing natural gas and supplying heat by using the abandoned mine fully utilizes geothermal resources in the abandoned mine, realizes the combination of the geothermal resources and a heating technology, improves the utilization rate of the geothermal resources, effectively solves the problem of low heating efficiency of an air source heat pump in northern winter, increases the access of the winter heating resources, reduces the energy consumption of the traditional heating mode, and has great technical progress significance for accelerating energy structure reformation and improving the utilization rate of clean energy;
3) the natural gas and heating system utilizing the abandoned mine to store the natural gas can realize the storage of the natural gas and the extraction of the high-temperature natural gas for heating, and has the advantages of simple structure, convenience in operation, low implementation cost and the like.
Drawings
Fig. 1 is a schematic structural view of a system for storing natural gas and heating using a waste mine according to the present invention;
fig. 2 is a flow chart illustrating a method for storing natural gas and heating using abandoned mines according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides a natural gas storage and heating system using abandoned mines, including an exhaust gas mine 10, a gas source heat pump 20, and a heat exchange system, where the exhaust gas mine 10 has a goaf 11, a natural gas injection well 12, a natural gas production well 13, and a natural gas detection well 14, where the natural gas injection well 12 and the natural gas production well 13 are both communicated with the goaf 11, the natural gas detection well 14 is not communicated with the goaf 11, the natural gas injection well 12 and the natural gas production well 13 are both provided with an underground safety valve 15, an air inlet end of the gas source heat pump 20 is communicated with the natural gas production well 13, the heat exchange system has a first feed end, a first discharge end, and a second discharge end, where the first feed end is communicated with a first liquid outlet of the gas source heat pump 20, and the first discharge end is communicated with a residential floor heating coil 30, the second discharge end is communicated with a resident natural gas conveying pipeline.
In the above embodiment, the gas inlet end of the gas source heat pump 20 is communicated with the natural gas injection well 12 through a first gas pipe, and the natural gas entering the gas source heat pump 20 is processed by the gas source heat pump 20 to form liquefied natural gas, and then the liquefied natural gas is output to the heat exchange system from the first liquid outlet of the liquefied natural gas.
In the present invention, the heat exchange system includes a water heat exchanger 50, a water pump 51, a valve 52, an electronic expansion valve 53 and an evaporator 54, a first liquid inlet end of the water heat exchanger 50 is communicated with a first liquid outlet of the air source heat pump 20 through a first liquid transport pipe 55, a second liquid outlet end thereof is connected with a second liquid inlet of the residential floor heating coil 30 through a second liquid transport pipe 56, a third liquid outlet end thereof is connected with a third liquid inlet of the evaporator 54 through a third liquid transport pipe 57, an air outlet of the evaporator 54 is communicated with a residential natural gas transport pipe, the water pump 51 and the valve 52 are respectively arranged on the second liquid transport pipe 56, and the electronic expansion valve 53 is arranged on the third liquid transport pipe 57.
In the above embodiment, in order to realize the recycling of the water in the floor heating coil 30, the water outlet of the floor heating coil 30 is also communicated with the water heat exchanger 50, so that the water cooled in the floor heating coil 30 enters the water heat exchanger 50 again to be heated. The air source heat pump 20 conveys the high-temperature liquefied natural gas into the water heat exchanger 50 through the first liquid conveying pipe 55, the cooling water in the water heat exchanger 50 is heated by the heat in the liquefied natural gas, the heated water is output through the second liquid outlet end of the water heat exchanger 50 and conveyed into the floor heating coil 30 of the residents through the second liquid conveying pipe 56 under the action of the water pump 51, so that heating is realized, and the valve 52 is used for adjusting the flow of the water, so that the purpose of controlling the floor heating temperature is achieved; on the other hand, after passing through the water heat exchanger 50, the lng is output from the third liquid outlet of the water heat exchanger 50, and passes through the electronic expansion valve 53, so that the pressure of the lng is reduced, and the lng with the reduced pressure enters the evaporator 54 through the third liquid transport pipe 57 to be evaporated, and is transported to the natural gas transport pipe of the residents to supply the natural gas to the residents, thereby realizing heating. The heat exchange system can fully utilize the heat in the liquefied natural gas, and has the advantages of high heat exchange speed, low implementation cost and the like.
The natural gas and heating system utilizing the abandoned mine to store the natural gas can realize the storage of the natural gas and the extraction of the high-temperature natural gas for heating, and has the advantages of simple structure, convenience in operation, low implementation cost and the like.
Referring to fig. 2, the present invention also provides a method for storing natural gas and heating by using abandoned mines, which mainly comprises the following steps:
s1, selecting a target abandoned mine, collecting geological data of the abandoned mine, and acquiring geological environment information of a gob 11 in the abandoned mine, wherein the geological environment information comprises distribution position, size, shape, boundary, maximum bearing capacity and maximum storage capacity information of the gob 11;
by acquiring the maximum storage capacity information of the goaf, the actual gas storage capacity of the goaf is known. Here, it should be noted that, in the present invention, the methods for acquiring the maximum pressure-bearing capacity and the maximum storage capacity information of the target abandoned mine are both the prior art, and the methods for acquiring the maximum pressure-bearing capacity and the maximum storage capacity information of the mine in the prior art can be both used as specific embodiments of the method for acquiring the maximum pressure-bearing capacity and the maximum storage capacity information of the target abandoned mine in the present invention.
S2, clearing accumulated water in the abandoned mine, plugging a shaft of the abandoned mine and cracks caused by excavation in the shaft, performing a hermetic seal experiment on the goaf 11 by adopting a CSCT method, detecting the air tightness of the goaf 11, if the air tightness in the goaf 11 is good, performing the next step, if the air tightness in the goaf 11 is poor, continuously checking whether each shaft of the abandoned mine and cracks in the shaft are tightly plugged until the air tightness in the goaf 11 is good;
the CSCT method, namely the shaft gas seal detection technology, is an effective means for detecting whether the gas seal of the underground gas storage is good or not, which is the prior art, and the specific detection principle of the CSCT method is not repeated in the invention. In the invention, the sealing of the shaft and the crack is realized by covering a sealing plate or spraying ultrafine concrete and the like. In addition, if there are coal mining wells around the target exhaust gas mine, it should also be plugged.
S3, respectively drilling a natural gas injection well 12, a natural gas production well 13 and a natural gas detection well 14 above the gob 11, wherein the natural gas injection well 12 and the natural gas production well 13 are communicated with the gob 11, the natural gas detection well is not communicated with the gob 11, underground safety valves 15 are respectively arranged in the natural gas injection well 12 and the natural gas production well 13, and natural gas is input into the gob 11 through the natural gas injection well 12, so that the natural gas can be stored in the gob 11;
the natural gas injection well 12, the natural gas production well 13 and the natural gas detection well 14 are respectively and independently arranged, and whether the drilling position is suitable for drilling a well mouth or not needs to be judged when the drilling position is selected, so that the collapse of the goaf 11 is avoided. The natural gas injection well 12 is used for injecting natural gas into the goaf 11, the natural gas recovery well 13 is used for outputting the natural gas in the goaf 11, and the natural gas detection well 14 is used for detecting whether natural gas leaks out.
And S4, externally connecting an air source heat pump 20 to the natural gas production well 13, extracting the high-temperature natural gas in the goaf 11 to the air source heat pump 20 through the natural gas production well 13, liquefying the high-temperature natural gas by the air source heat pump 20, and then conveying the liquefied natural gas to a heat exchange system, wherein the heat exchange system extracts heat in the liquefied natural gas to convey the heat to a floor heating coil 30 of a resident, and the liquefied natural gas is conveyed to a natural gas conveying pipeline of the resident and is used for heating the resident.
The heat exchange system of the present invention may adopt the structure of the heat exchange system, and may also adopt a heat exchange structure capable of realizing heat utilization of high temperature liquefied natural gas and converting liquefied natural gas into gaseous natural gas in the prior art as a specific embodiment of the heat exchange system of the present invention.
The method for storing natural gas and supplying heat by using the abandoned mine has the following advantages:
4) the underground space part of the abandoned mine is used for storing natural gas, so that the full utilization of waste gas mine resources is realized, the problem of resource waste caused by abandoned coal mines in the prior art is effectively solved, the repeated utilization rate of the abandoned mine is improved, and the urban transformation development of resource exhaustion is promoted; the natural gas storage device can store excessive natural gas in summer and take out the excessive natural gas in winter, so that the storage space of the natural gas is enlarged, the pressure of natural gas in the peak period of natural gas demand can be effectively relieved, and more economic benefits are brought.
5) The geothermal resource in the abandoned mine is fully utilized, the combination of the geothermal resource and the heating technology is realized, the utilization rate of the geothermal resource is improved, the problem of low heating efficiency of an air source heat pump in winter in the north is effectively solved, the acquisition way of the heating resource in winter is increased, the energy consumption of the traditional heating mode is reduced, and the energy source heat pump has great technical progress significance for accelerating energy structure reformation and improving the utilization rate of clean energy.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A method for storing natural gas and supplying heat by using abandoned mines is characterized by mainly comprising the following steps:
s1, selecting a target abandoned mine, and acquiring geological environment information of a goaf (11) in the abandoned mine;
s2, cleaning the abandoned mine, plugging the shaft of the abandoned mine and cracks caused by excavation in the shaft, detecting the air tightness of the goaf (11), if the air tightness in the goaf (11) is good, carrying out the next step, if the air tightness in the goaf (11) is poor, continuously checking whether each shaft of the abandoned mine and the cracks in the shaft are tightly plugged until the air tightness in the goaf (11) is good;
s3, drilling a natural gas injection well (12), a natural gas recovery well (13) and a natural gas detection well (14) above the goaf (11), wherein the natural gas injection well (12) and the natural gas recovery well (13) are communicated with the goaf (11), the natural gas detection well is not communicated with the goaf (11), underground safety valves (15) are respectively arranged in the natural gas injection well (12) and the natural gas recovery well (13), and natural gas is input into the goaf (11) through the natural gas injection well (12), so that the natural gas can be stored in the goaf (11);
s4, externally connecting an air source heat pump (20) to the natural gas recovery well (13), extracting high-temperature natural gas in the goaf (11) to the air source heat pump (20) through the natural gas recovery well (13), carrying out liquefaction treatment by the air source heat pump (20), and then conveying the liquefied natural gas to a heat exchange system, wherein the heat exchange system extracts heat in the liquefied natural gas and conveys the heat to a floor heating coil (30) of a resident, and the liquefied natural gas is conveyed to a natural gas conveying pipeline of the resident so as to realize heating.
2. The method for natural gas storage and heating using abandoned mines according to claim 1, wherein the geological environment information in the S1 includes distribution position, size, shape, boundary, maximum bearing capacity and maximum storage capacity information of the goaf (11).
3. The method for storing natural gas and heating by using abandoned mine shafts according to claim 1, wherein the method for blocking the shaft and the cracks thereof in S2 is one or more of covering a sealing plate or spraying ultrafine concrete.
4. A natural gas storage and heating system utilizing abandoned mines is characterized by comprising an exhaust gas mine (10), an air source heat pump (20) and a heat exchange system, the waste gas mine (10) is provided with a goaf (11), a natural gas injection well (12) and a natural gas recovery well (13), the natural gas injection well (12) and the natural gas production well (13) are both communicated with the goaf (11), and is internally provided with an underground safety valve (15), the gas inlet end of the gas source heat pump (20) is communicated with the natural gas production well (13), the heat exchange system is provided with a first feed end, a first discharge end and a second discharge end, the first feeding end of the device is communicated with the first liquid outlet of the air source heat pump (20), the first discharging end of the device is communicated with the resident floor heating coil (30), and the second discharging end of the device is communicated with the resident natural gas conveying pipeline.
5. The natural gas and heat supply system using abandoned mines according to claim 4, wherein the exhaust gas mine (10) further has a natural gas detection well (14) which is provided independently of the natural gas injection well (12) and the natural gas production well (13) and is not communicated with the goaf (11), and the natural gas detection well (14) is used for detecting whether natural gas leaks out.
6. The natural gas and heating system for waste mines according to claim 4, wherein the heat exchange system comprises a water heat exchanger (50) and an evaporator (54), a first liquid inlet end of the water heat exchanger (50) is communicated with a first liquid outlet of the gas source heat pump (20), a second liquid outlet end of the water heat exchanger is connected with a second liquid inlet of the residential floor heating coil (30), a third liquid outlet end of the water heat exchanger is connected with a third liquid inlet of the evaporator (54), and an air outlet of the evaporator (54) is communicated with the residential natural gas conveying pipeline.
7. The system for storing and heating natural gas and heating by using abandoned mine shafts according to claim 6, characterized in that the heat exchange system further comprises a water pump (51), a valve (52) and an electronic expansion valve (53), the water pump (51) and the valve (52) are respectively arranged at the second liquid outlet end of the water heat exchanger (50), and the electronic expansion valve (53) is arranged at the third liquid outlet end of the water heat exchanger (50).
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| CN111878168A (en) | 2020-11-03 |
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