CN113144464A - Method for inhibiting spontaneous combustion of coal gangue pile and extracting heat of coal gangue pile for application - Google Patents
Method for inhibiting spontaneous combustion of coal gangue pile and extracting heat of coal gangue pile for application Download PDFInfo
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- CN113144464A CN113144464A CN202110372972.3A CN202110372972A CN113144464A CN 113144464 A CN113144464 A CN 113144464A CN 202110372972 A CN202110372972 A CN 202110372972A CN 113144464 A CN113144464 A CN 113144464A
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- coal gangue
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- gangue pile
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/06—Fire prevention, containment or extinguishing specially adapted for particular objects or places of highly inflammable material, e.g. light metals, petroleum products
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
- F24T10/17—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using tubes closed at one end, i.e. return-type tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/40—Geothermal heat-pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention belongs to the technical field of coal gangue heat utilization, and particularly relates to a method for inhibiting spontaneous combustion of a coal gangue pile and extracting heat of the coal gangue pile for application. Comprises the following steps. S100, selecting a place without groundwater seepage, and excavating a foundation pit. S200, placing a plurality of groups of coaxial sleeves arranged transversely and longitudinally into a foundation pit. S300, coal gangue is filled layer by layer, the coaxial sleeve is kept upright and not inclined during backfilling, the coaxial sleeve is backfilled to 0.5m below the ground surface, and then a covering layer is laid on the coaxial sleeve for heat preservation, so that the heat of the coal gangue pile cannot be dissipated into the atmosphere. S400, two rows of exhaust holes are reserved at two ends of the covering layer and connected with an earth surface air source heat pump for heating. S500, the coaxial sleeve comprises an outer pipe and an inner pipe which are coaxially arranged, water is injected between the outer pipe and the inner pipe through a water pump, water is pumped from the inner pipe, and the pumped hot water is applied.
Description
Technical Field
The invention belongs to the technical field of coal gangue heat utilization, and particularly relates to a method for inhibiting spontaneous combustion of a coal gangue pile and extracting heat of the coal gangue pile for application.
Background
The coal gangue is one of the industrial solid wastes with the largest discharge amount in the coal mining process and the like. Under the condition of natural accumulation, most of coal gangue is easy to generate spontaneous combustion due to the special physicochemical property of the coal gangue, which causes the ecological environment and safety problems of mining areas. Therefore, the cooling and heat dissipation of the coal gangue pile have important practical significance.
At present, the common fire extinguishing method for coal gangue dump at home and abroad mainly comprises a covering method, an excavating method, a grouting sealing and foam fire extinguishing method, a controlled combustion method, a low-temperature inert gas method and a low-temperature heat pipe method. The methods play a role in inhibiting large-scale combustion of coal gangue to a certain extent, but have the following defects: (1) the waste is not changed into valuable, the spontaneous combustion temperature of the coal gangue can reach thousands of ℃, and the high-quality heat source is not utilized; (2) the coal gangue pile is mostly arranged in the valley near the mining area, and after backfilling, the upper part of the coal gangue pile cannot be used for living or building a factory building and the like, so that land resources are wasted.
Disclosure of Invention
In order to solve the problems, the invention provides a method for inhibiting spontaneous combustion of a coal gangue pile and extracting heat of the coal gangue pile for application.
The invention adopts the following technical scheme: a method for inhibiting spontaneous combustion of a coal gangue pile and extracting heat of the coal gangue pile for application comprises the following steps.
S100, selecting a place without groundwater seepage, and excavating a foundation pit. S200, placing a plurality of groups of coaxial sleeves arranged transversely and longitudinally into a foundation pit. S300, coal gangue is filled layer by layer, the coaxial sleeve is kept upright and not inclined during backfilling, the coaxial sleeve is backfilled to 0.5m below the ground surface, and then a covering layer is laid on the coaxial sleeve for heat preservation, so that the heat of the coal gangue pile cannot be dissipated into the atmosphere. S400, two rows of exhaust holes are reserved at two ends of the covering layer and connected with an earth surface air source heat pump for heating. S500, the coaxial sleeve comprises an outer pipe and an inner pipe which are coaxially arranged, water is injected between the outer pipe and the inner pipe through a water pump, water is pumped from the inner pipe, and the pumped hot water is applied.
Further, the distance L =2-4 m between the coaxial sleeves.
Furthermore, the depth of the foundation pit is 5-10 meters.
Furthermore, the exhaust holes are located at two ends of the top of the foundation pit, and hollow steel pipes are adopted and inserted into the top of the coal gangue pile.
Further, the covering layer is 0.5m thick and covers the top of the whole coal gangue pile, and the covering layer is jointly covered by pouring of an clay layer and a concrete layer from bottom to top.
Further, in step S500, if the temperature of the extracted hot water is greater than 80 ℃, an organic rankine generator set is connected to generate power; if the temperature is less than 30 ℃ and less than 80 ℃, directly supplying the coal mine to a mine area for heating or domestic hot water; if the temperature is less than 10 ℃ and less than 30 ℃, connecting a heat pump to supply heat to the mine area or building a greenhouse.
Compared with the prior art, the invention has the following beneficial effects:
(1) the coaxial sleeve group holes are arranged in a mode that the overall temperature is reduced from shallow to deep, so that spontaneous combustion of coal gangue can be effectively inhibited; secondly, the heat generated by oxidation of the coal gangue is fully utilized, the environment is protected, waste is changed into valuable, the problems of hot water for life in mining areas, heating in winter and the like can be solved, and other industries such as greenhouse, hot spring hotel, drying plant and the like can be built on the coal gangue. Even can provide power for mines, and at present, the temperature is sufficient, and the sustainability needs to be evaluated.
(2) The technologies such as coaxial sleeves, foundation pits and heat pumps are mature, so that the technical bottleneck difficult to realize does not exist, and the method is popularized by utilizing engineering.
Drawings
FIG. 1 is a schematic cross-sectional view of a system (taking a single well as an example);
FIG. 2 is a schematic plan view of the system (cluster holes);
in the figure, 1-coal gangue pile, 2-foundation pit, 3-exhaust hole, 4-covering layer, 5-coaxial sleeve, 6-outer pipe and 7-inner pipe.
Detailed Description
A method for inhibiting spontaneous combustion of coal gangue piles and extracting heat of the coal gangue piles for application comprises the following steps,
s100, selecting a place without underground water seepage, excavating a foundation pit (well draining the foundation pit) of 5-10 m, and determining the area of the foundation pit according to the coal gangue amount.
S200, putting the inner pipe and the outer pipe of the coaxial sleeve according to the figure 1, and then arranging a plurality of shallow coaxial sleeves (group holes) in the foundation pit in advance according to the figure 2.
S300, coal gangue is filled layer by layer, the coaxial sleeve is kept upright and not inclined during backfilling, the coaxial sleeve is backfilled to 0.5m below the ground surface, and then a covering layer is laid on the coaxial sleeve for heat preservation, so that the heat of the coal gangue pile cannot be dissipated into the atmosphere.
And S400, reserving two rows of exhaust holes at two ends of the covering layer to exhaust waste gas generated after oxidation of coal gangue. The temperature of the exhausted waste gas is much higher than the atmospheric temperature, and the exhaust hole is grounded to the surface air source heat pump for heating;
s500, the coaxial sleeve comprises an outer pipe and an inner pipe which are coaxially arranged, the outer pipe is a steel pipe, the inner pipe is a heat insulation pipe, water is injected between the outer pipe and the inner pipe through a water pump, water is pumped from the inner pipe, and the pumped hot water is used.
(1) Coaxial bushing: the composition and construction process refer to the prior oil-gas well and a middle-deep layer coaxial casing. The pipe diameters are approximately as shown in figure 1 and can be readjusted according to specific conditions. The method has the advantages that the coaxial casing is firstly installed and then the gangue is piled, so that the drilling cost is saved, cement slurry solidification is not needed, and the cost is greatly reduced. The only care to be taken is to keep the coaxial sleeve straight and not inclined during backfilling. In addition, the depth of the sleeve is only 5-10 m, and the construction is convenient. The distance between the coaxial sleeves is ensured not to generate thermal interference, and generally, L1= L2= 2-4 m (figure 2). It should be noted that the traditional PVC buried pipe can be heated in advance, but the coal gangue temperature is too high, and the PVC pipe is only 70 ℃ in heat resistance, so that the coaxial sleeve is adopted.
(2) Foundation pit: about 5~10m is deep, and construction and drainage refer to the standard of worker's civil construction foundation ditch. The area of the foundation pit is determined according to the amount of coal gangue, and a plurality of foundation pits can be excavated and respectively applied differently.
(3) Air exhaust hole: and (4) hollow steel pipes are arranged at two ends of the top of the foundation pit and are inserted into the top of the coal gangue pile. Waste gas generated in the oxidation of the coal gangue can continuously move upwards through a backfilling gap, and can be discharged from exhaust holes at two sides due to the blocking of a covering layer at the top. The exhaust gas is collected through the exhaust holes and is connected with an air source heat pump to further extract heat.
(4) Covering layer: the thickness is 0.5m, and the top of the whole coal gangue pile is covered. From the bottom up can adopt clay layer and concrete layer to pour and jointly cover, the purpose has two: firstly, heat preservation is carried out, so that the heat of the coal gangue pile cannot be dissipated into the atmosphere; and secondly, the environment is protected, the irritant gas generated by oxidation of the coal gangue is prevented from being directly dispersed into the atmosphere in a large area, the gas is harmful to human bodies and air because a greenhouse or a bath can be built on the ground surface, and the gas is collected through exhaust holes at two ends in a centralized manner.
(5) Power generation and heating greenhouse bathing: after water is pumped from the inner tube of the coaxial sleeve to the surface, the following applications can be carried out according to the temperature: if the temperature is higher than 80 ℃, an organic Rankine generator set is connected to generate electricity; if the temperature is less than 30 ℃ and less than 80 ℃, directly supplying the coal mine to a mine area for heating or domestic hot water; if the temperature is less than 10 ℃ and less than 30 ℃, the heat pump is connected to supply heat to the mine area or build a greenhouse, and the like.
Claims (6)
1. A method for inhibiting spontaneous combustion of a coal gangue pile and extracting heat of the coal gangue pile for application is characterized by comprising the following steps of: comprises the following steps of (a) carrying out,
s100, selecting a site without groundwater seepage, and excavating a foundation pit;
s200, placing a plurality of groups of coaxial sleeves arranged transversely and longitudinally into a foundation pit;
s300, filling coal gangue layer by layer, keeping the coaxial sleeve upright and not inclined during backfilling, backfilling until the distance is 0.5m below the ground surface, and then laying a covering layer on the coaxial sleeve for heat preservation to prevent the heat of the coal gangue pile from dissipating into the atmosphere;
s400, leaving two rows of exhaust holes at two ends of the covering layer, wherein the exhaust holes are connected with an earth surface air source heat pump for heating;
s500, the coaxial sleeve comprises an outer pipe and an inner pipe which are coaxially arranged, water is injected between the outer pipe and the inner pipe through a water pump, water is pumped from the inner pipe, and the pumped hot water is applied.
2. The method of suppressing spontaneous combustion of a coal gangue pile and extracting heat therefrom for use as claimed in claim 1, wherein: the distance L =2-4 m between the coaxial sleeves.
3. The method of suppressing spontaneous combustion of a coal gangue pile and extracting heat therefrom for use as claimed in claim 1, wherein: the depth of the foundation pit is 5-10 meters.
4. The method of suppressing spontaneous combustion of a coal gangue pile and extracting heat therefrom for use as claimed in claim 1, wherein: the exhaust holes are located at two ends of the top of the foundation pit, and the hollow steel pipes are inserted into the top of the coal gangue pile.
5. The method of suppressing spontaneous combustion of a coal gangue pile and extracting heat therefrom for use as claimed in claim 1, wherein: the covering layer is 0.5m thick, covers the whole top of the coal gangue pile, and is poured and covered by an clay layer and a concrete layer from bottom to top.
6. The method of suppressing spontaneous combustion of a coal gangue pile and extracting heat therefrom for use as claimed in claim 1, wherein: in the step S500, if the temperature of the extracted hot water is more than 80 ℃, an organic Rankine generator set is connected to generate power; if the temperature is less than 30 ℃ and less than 80 ℃, directly supplying the coal mine to a mine area for heating or domestic hot water; if the temperature is less than 10 ℃ and less than 30 ℃, connecting a heat pump to supply heat to the mine area or building a greenhouse.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110372972.3A CN113144464A (en) | 2021-04-07 | 2021-04-07 | Method for inhibiting spontaneous combustion of coal gangue pile and extracting heat of coal gangue pile for application |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110372972.3A CN113144464A (en) | 2021-04-07 | 2021-04-07 | Method for inhibiting spontaneous combustion of coal gangue pile and extracting heat of coal gangue pile for application |
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| CN113144464A true CN113144464A (en) | 2021-07-23 |
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| CN202110372972.3A Pending CN113144464A (en) | 2021-04-07 | 2021-04-07 | Method for inhibiting spontaneous combustion of coal gangue pile and extracting heat of coal gangue pile for application |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1270166A1 (en) * | 1985-07-02 | 1986-11-15 | Институт Геологии И Геохимии Горючих Ископаемых Ан Усср | Method of gasifying coal-like waste dump |
| CN109083633A (en) * | 2018-06-22 | 2018-12-25 | 山西元森科技有限公司 | A kind of hillock residual-heat utilization method |
| CN111442549A (en) * | 2020-03-10 | 2020-07-24 | 甘肃省建材科研设计院有限责任公司 | Method for enhancing heat exchange |
| CN111760217A (en) * | 2020-07-08 | 2020-10-13 | 山西工程技术学院 | Power generation equipment for preventing and controlling spontaneous combustion of coal gangue dump and heat recovery and control method |
-
2021
- 2021-04-07 CN CN202110372972.3A patent/CN113144464A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1270166A1 (en) * | 1985-07-02 | 1986-11-15 | Институт Геологии И Геохимии Горючих Ископаемых Ан Усср | Method of gasifying coal-like waste dump |
| CN109083633A (en) * | 2018-06-22 | 2018-12-25 | 山西元森科技有限公司 | A kind of hillock residual-heat utilization method |
| CN111442549A (en) * | 2020-03-10 | 2020-07-24 | 甘肃省建材科研设计院有限责任公司 | Method for enhancing heat exchange |
| CN111760217A (en) * | 2020-07-08 | 2020-10-13 | 山西工程技术学院 | Power generation equipment for preventing and controlling spontaneous combustion of coal gangue dump and heat recovery and control method |
Non-Patent Citations (2)
| Title |
|---|
| 李三练: "《环境的呼唤 关于人类生存环境的对话》", 30 December 1997, 中国环境科学出版社 * |
| 李登新著: "《固体废物处理与处置工程素质综合训练》", 30 August 2019, 中国环境出版社 * |
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Application publication date: 20210723 |