CN107177497B - Mine goaf filling straw biological gas production system and gas production process thereof - Google Patents
Mine goaf filling straw biological gas production system and gas production process thereof Download PDFInfo
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- 239000010902 straw Substances 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 132
- 238000012544 monitoring process Methods 0.000 claims abstract description 68
- 238000004321 preservation Methods 0.000 claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 31
- 239000002918 waste heat Substances 0.000 claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 241000894006 Bacteria Species 0.000 claims abstract description 8
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 4
- 239000000956 alloy Substances 0.000 claims abstract description 4
- 239000010935 stainless steel Substances 0.000 claims abstract description 4
- 229910001256 stainless steel alloy Inorganic materials 0.000 claims abstract description 4
- 230000001580 bacterial effect Effects 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 6
- 230000004060 metabolic process Effects 0.000 claims description 6
- 229920000742 Cotton Polymers 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 102000004190 Enzymes Human genes 0.000 claims description 3
- 108090000790 Enzymes Proteins 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000003911 water pollution Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000005065 mining Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
- C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
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- C12M23/00—Constructional details, e.g. recesses, hinges
- C12M23/36—Means for collection or storage of gas; Gas holders
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- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
- C12M41/12—Means for regulation, monitoring, measurement or control, e.g. flow regulation of temperature
- C12M41/18—Heat exchange systems, e.g. heat jackets or outer envelopes
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- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
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- C12P5/00—Preparation of hydrocarbons or halogenated hydrocarbons
- C12P5/02—Preparation of hydrocarbons or halogenated hydrocarbons acyclic
- C12P5/023—Methane
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
A mine goaf filling straw bio-gas production system comprises a hot water inlet well, a backwater well, a temperature monitoring well, an exogenous bacterium injection and flora monitoring well and a bio-gas collection and transportation well which are communicated with the ground are formed above the mine goaf, heat preservation pipelines made of stainless steel or aluminum alloy materials are vertically and horizontally staggered and paved on the ground in the goaf, a waste heat water discharge pipe of a thermal power plant penetrates through the hot water inlet well to extend into the goaf to be connected with a water inlet of the heat preservation pipeline, a water outlet of the heat preservation pipeline is connected with a backwater pipe, the backwater pipe upwards penetrates through the backwater well to return to the thermal power plant, and crushed straws are filled in the goaf. The invention also discloses a gas production process of the mine goaf filling straw biological gas production system. The invention utilizes the good space advantage of the underground goaf of the mine to achieve the purpose of green mining of the mine; simultaneously, the straw is converted into clean energy by using biotechnology, so that energy conservation and emission reduction are realized.
Description
Technical Field
The invention belongs to the field of engineering combining mine goaf filling and straw bioconversion, and particularly relates to a mine goaf filling straw biological gas production system and a gas production process thereof.
Background
The goaf filling in China mainly uses gangue and paste filling, and has a series of problems of lack of filling materials, low filling rate, high investment and the like. Straw is a main legacy after harvesting crops, resources are widely distributed and huge in quantity, but the utilization rate is low, and the traditional incineration treatment causes resource waste and severely pollutes the environment. Research proves that microbial flora commonly containing degradable straw in mine water is converted into clean energy source-biological methane. However, no idea of filling straw organisms to produce methane gas by utilizing the advantage of the closed space of a mine goaf exists at present.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a mine goaf filling straw biological gas production system and a gas production process thereof under the condition of waste heat temperature control of a thermal power plant.
In order to solve the technical problems, the invention adopts the following technical scheme: a mine goaf filling straw biological gas production system comprises a hot water inlet well, a backwater well, a temperature monitoring well, an exogenous bacterium injection and flora monitoring well and a biological gas collection and transportation well which are communicated with the ground, wherein heat preservation pipelines made of stainless steel or aluminum alloy materials are arranged on the ground in the goaf in a crisscross mode, radiating fins are uniformly arranged on the heat preservation pipelines, the distance between the hot water inlet well and a thermal power plant is smaller than the distance between the backwater well and the thermal power plant, a waste heat water discharge pipe of the thermal power plant penetrates through the hot water inlet well to extend into the goaf and is connected with a water inlet of the heat preservation pipeline, a water outlet of the heat preservation pipeline is connected with a water return pipe, the water return pipe upwards penetrates through the backwater well and returns to the thermal power plant, crushed straw is filled in the goaf, and a temperature sensor for monitoring the temperature in the goaf is arranged in the temperature monitoring well.
The temperature monitoring wells are provided with a plurality of temperature monitoring wells, and the plurality of temperature monitoring wells are uniformly distributed above the mine goaf.
And a plurality of underground water monitoring wells are drilled downwards from the ground with the horizontal distance of 10m, 30m and 50m from the goaf, and an underground water remote measuring terminal is arranged in the underground water monitoring wells.
And the ground surface with the horizontal distance of 20m, 50m, 100m and 500m from the goaf drills down a plurality of earth surface subsidence monitoring wells, and an on-line monitoring early warning terminal, a GPS and a total station are arranged at the wellhead of the earth surface subsidence monitoring well to monitor the displacement and cracks of the goaf and the surrounding earth surface in real time.
The part of the waste heat water discharge pipe on the ground is wrapped with heat preservation cotton.
A gas production process of a mine goaf filling straw biological gas production system comprises the following steps:
(1) Paving a heat preservation pipeline in a mine goaf, connecting a water outlet of a waste heat water discharge pipe with a water inlet of the heat preservation pipeline through a hot water inlet well, arranging a thermometer and a flow control valve which are positioned at a wellhead of the hot water inlet well on the waste heat water discharge pipe, connecting a water inlet of a water return pipe with a water outlet of the heat preservation pipeline through a water return well, arranging a circulating water pump connected to the hot water inlet pipe on a thermal power plant, respectively sealing the hot water inlet well and the water return well at inlets of the hot water inlet well and the water return well, and connecting a gas collecting device at the wellhead of a biogas collection and transportation well;
(2) After the straws are crushed by a crusher on the ground, the crushed straws are conveyed to a goaf for filling through a special drilling channel or an original roadway of a mine, and the straws are filled and compacted in the goaf as much as possible;
(3) Setting a temperature sensor for monitoring the temperature in the goaf in the temperature monitoring well, and sealing the temperature monitoring well and the exogenous bacterium injection and flora monitoring well;
(4) Starting a circulating water pump, enabling hot water to flow into a heat preservation pipeline from a waste heat water discharge pipe, radiating heat into a goaf through the heat preservation pipeline and a radiating fin, enabling lower-temperature water to flow back to a thermal power plant through a water return pipe, analyzing the goaf temperature acquired by a temperature sensor, inlet temperature acquired by a thermometer and flow data acquired by a flow control valve through a computer, realizing automatic control, and ensuring that the goaf temperature is maintained at 30-35 ℃;
(5) Injecting a source for soaking straw or injecting exogenous bacterial liquid into the goaf through an exogenous bacterial injection and flora monitoring well, collecting liquid in the goaf through the exogenous bacterial injection and flora monitoring well after 15 days, and monitoring flora metabolism and environment through indexes such as flora identification, growth characteristics, biological enzyme activity and metabolism rate;
(6) And the biogas produced by the straw is discharged upwards from the biogas collection and transportation well and is collected into the gas collection device.
And (3) when the step (1) is implemented, a plurality of underground water monitoring wells are drilled downwards from the ground with the horizontal distance of 10m, 30m and 50m from the goaf, an underground water telemetry terminal is installed in the underground water monitoring wells, the water level, the water temperature and the water quality parameters of underground water outside the goaf are monitored for a long time and automatically stored in the process of straw gas production, and the change rule of the underground water is dynamically analyzed, so that the problem of underground water pollution is prevented.
And (3) while the step (1) is implemented, an on-line monitoring and early warning terminal, a GPS and a total station are installed on the ground with the horizontal distances of 20m, 50m, 100m and 500m from the goaf to monitor the displacement and cracks of the goaf and the peripheral ground surface in real time, and the displacement and cracks are compared with the ground surface of the goaf which is not filled with straws, so that the attenuation degree of ground surface subsidence is evaluated.
And (6) if a plurality of goaf areas exist in the range of one mine, collecting and conveying the biogas generated by the goaf areas through paving special pipelines on the ground.
By adopting the technical scheme, the heat-insulating pipeline is provided with the radiating fins, so that the radiating efficiency of the residual hot water can be improved. The part of the waste heat water discharge pipe on the ground is wrapped with heat preservation cotton, so that the loss of hot water on the ground is reduced as much as possible, and more heat is released in the goaf. The distance between the hot water inlet well and the thermal power plant is smaller than that between the backwater well and the thermal power plant, so that the loss of residual hot water on the ground is reduced as much as possible.
According to the invention, the goaf is filled with the straw, so that the subsidence of the earth surface is slowed down, meanwhile, the mine water contains biological flora or exogenous bacteria, the straw can be efficiently degraded into biological methane under the condition of controlling the temperature by using the waste heat of the power plant, and the green mining of the mine and the efficient utilization of the straw are realized. The invention utilizes the indigenous flora contained in mine water or the injected exogenous flora to degrade the straw filled in the goaf into biological methane, thereby having the double effects of slowing down ground subsidence and obtaining clean energy.
The invention utilizes the good space advantage of the underground goaf of the mine, also relieves the problems of insufficient filling material, high cost and the like of the goaf, solves the problem of geological disasters caused by ground subsidence, and achieves the purpose of green mining of the mine; simultaneously, the straw is converted into clean energy by using biotechnology, so that energy conservation and emission reduction are realized.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
As shown in fig. 1, the invention discloses a mine goaf filling straw bio-gas production system, which comprises a hot water inlet well 1, a backwater well 2, a temperature monitoring well 3, an exogenous bacterium injection and flora monitoring well 4 and a biogas collection and transportation well 5 which are communicated with the ground, wherein a heat preservation pipeline 6 made of stainless steel or aluminum alloy materials (corrosion reduction) is vertically and horizontally paved on the ground in the goaf 17, radiating fins are uniformly arranged on the heat preservation pipeline 6, the distance between the hot water inlet well 1 and a thermal power plant 7 is smaller than the distance between the backwater well 2 and the thermal power plant 7, a waste heat water discharge pipe 8 of the thermal power plant 7 penetrates through the hot water inlet well 1 to be connected with a water inlet of the heat preservation pipeline 6, a water return pipe 9 is connected with a water outlet of the heat preservation pipeline 6, the backwater pipe 9 penetrates upwards through the backwater well 2 and then returns to the thermal power plant 7, crushed straws 18 are filled in the goaf 17, a temperature sensor 10 for monitoring the temperature in the goaf 17 is arranged in the temperature monitoring well 3, and a waste heat flow rate control valve 11 connected to the waste heat inlet well 1 are arranged at a wellhead of the hot water inlet well 1.
The temperature monitoring wells 3 are provided with a plurality of temperature monitoring wells 3 which are uniformly distributed above the mine goaf 17.
A plurality of underground water monitoring wells 13 are drilled downwards from the ground with the horizontal distance of 10m, 30m and 50m from the goaf 17, and an underground water telemetry terminal 14 is installed in the underground water monitoring wells 13.
And a plurality of earth surface subsidence monitoring wells 16 are drilled on the ground with the horizontal distances of 20m, 50m, 100m and 500m from the goaf 17, and an on-line monitoring and early warning terminal 15, a GPS and a total station are arranged at the wellhead of the earth surface subsidence monitoring well 16 to monitor the displacement and cracks of the goaf 17 and the surrounding earth surface in real time.
The part of the waste heat water discharge pipe 8 on the ground is wrapped with heat preservation cotton.
A gas production process of a mine goaf filling straw biological gas production system comprises the following steps:
(1) A heat preservation pipeline 6 is paved in a mine goaf 17, a water outlet of a waste heat water discharge pipe 8 is connected with a water inlet of the heat preservation pipeline 6 through a hot water inlet well 1, a thermometer 11 and a flow control valve 12 which are positioned at a wellhead of the hot water inlet well 1 are arranged on the waste heat water discharge pipe 8, a water inlet of a return pipe 9 is connected with a water outlet of the heat preservation pipeline 6 through a return well 2, a circulating water pump connected with a hot water inlet pipe is arranged in a thermal power plant 7, the hot water inlet well 1 and the return well 2 are respectively sealed at inlets of the hot water inlet well 1 and the return well 2, and a wellhead of a biogas collection and transportation well 5 is connected with a gas collecting device;
(2) After the straws 18 are crushed by a crusher on the ground, the crushed straws 18 are conveyed to the goaf 17 for filling through a special drilling channel or an original roadway of a mine, and the straws 18 are filled and compacted in the goaf 17 as much as possible;
(3) A temperature sensor 10 for monitoring the temperature in the goaf 17 is arranged in the temperature monitoring well 3, and the temperature monitoring well 3 and the exogenous bacterium injection and flora monitoring well 4 are closed;
(4) Starting a circulating water pump, enabling hot water to flow into a heat preservation pipeline 6 through a waste heat water discharge pipe 8, radiating heat into a goaf 17 through the heat preservation pipeline 6 and cooling fins, enabling water with lower temperature to flow back to a thermal power plant 7 through a water return pipe 9, analyzing the temperature of the goaf 17 acquired through a temperature sensor 10, the inlet temperature acquired through a thermometer 11 and the flow data acquired through a flow control valve 12 through a computer, realizing automatic control, and ensuring that the temperature of the goaf 17 is maintained at 30-35 ℃;
(5) Injecting a source for soaking straw 18 or injecting exogenous bacterial liquid into the goaf 17 through the exogenous bacterial injection and flora monitoring well 4, collecting the liquid in the goaf 17 through the exogenous bacterial injection and flora monitoring well 4 after 15 days, and monitoring flora metabolism and environment through indexes such as flora identification, growth characteristics, biological enzyme activity and metabolism rate;
(6) The biogas produced by the straw 18 is discharged upwards from the biogas collection and transportation well 5 and is collected in the gas collection device.
And (2) while the step (1) is implemented, a plurality of underground water monitoring wells 13 are drilled downwards from the ground with the horizontal distance of 10m, 30m and 50m from the goaf 17, an underground water telemetry terminal 14 is installed in the underground water monitoring wells 13, and the water level, the water temperature and the water quality parameters of underground water outside the goaf 17 are monitored for a long time and automatically stored in the process of producing gas by the straws 18, so that the change rule of the underground water is dynamically analyzed, and the problem of underground water pollution is prevented.
While the step (1) is carried out, an on-line monitoring and early warning terminal 15, a GPS and a total station are installed on the ground with the horizontal distances of 20m, 50m, 100m and 500m from the goaf 17 to monitor the displacement and cracks of the goaf 17 and the peripheral ground surface in real time and compare the displacement and cracks with the ground surface of the goaf 17 which is not filled with straws 18 so as to evaluate the attenuation degree of ground surface subsidence.
In the step (6), if a plurality of goafs 17 exist in a mine, biogas generated in the goafs 17 is collected and transported by laying a special pipeline on the ground.
The present embodiment is not limited in any way by the shape, material, structure, etc. of the present invention, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention are all included in the scope of protection of the technical solution of the present invention.
Claims (2)
1. A gas production process of a mine goaf filling straw biological gas production system is characterized in that: the system comprises a hot water inlet well, a backwater well, a temperature monitoring well, an exogenous bacterium injection and flora monitoring well and a biogas collection and transportation well which are communicated with the ground, wherein a heat preservation pipeline made of stainless steel or aluminum alloy materials is arranged on the ground in the goaf in a crisscross manner, radiating fins are uniformly arranged on the heat preservation pipeline, the distance between the hot water inlet well and a thermal power plant is smaller than the distance between the backwater well and the thermal power plant, a waste heat water discharge pipe of the thermal power plant penetrates through the hot water inlet well to extend into the goaf and is connected with a water inlet of the heat preservation pipeline, a water outlet of the heat preservation pipeline is connected with a water return pipe, the water return pipe upwards penetrates through the backwater well and returns to the thermal power plant, crushed straws are filled in the goaf, and a temperature sensor for monitoring the temperature in the goaf is arranged in the temperature monitoring well;
the temperature monitoring wells are arranged in a plurality, and the temperature monitoring wells are uniformly distributed above the mine goaf;
a plurality of underground water monitoring wells are drilled downwards from the ground with the horizontal distance of 10m, 30m and 50m from the goaf, and an underground water telemetry terminal is arranged in the underground water monitoring wells;
a plurality of earth surface subsidence monitoring wells are drilled downwards from the ground with the horizontal distance of 20m, 50m, 100m and 500m, and an on-line monitoring early warning terminal, a GPS and a total station are arranged at the wellhead of the earth surface subsidence monitoring well to monitor the displacement and cracks of the surrounding earth surface of the goaf in real time;
the part of the waste heat water discharge pipe on the ground is wrapped with heat preservation cotton;
the gas production process comprises the following steps:
(1) Paving a heat preservation pipeline in a mine goaf, connecting a water outlet of a waste heat water discharge pipe with a water inlet of the heat preservation pipeline through a hot water inlet well, arranging a thermometer and a flow control valve which are positioned at a wellhead of the hot water inlet well on the waste heat water discharge pipe, connecting a water inlet of a water return pipe with a water outlet of the heat preservation pipeline through a water return well, arranging a circulating water pump connected to the hot water inlet pipe on a thermal power plant, respectively sealing the hot water inlet well and the water return well at inlets of the hot water inlet well and the water return well, and connecting a gas collecting device at the wellhead of a biogas collection and transportation well;
(2) After the straws are crushed by a crusher on the ground, the crushed straws are conveyed to a goaf for filling through a special drilling channel or an original roadway of a mine, and the straws are filled and compacted in the goaf as much as possible;
(3) Setting a temperature sensor for monitoring the temperature in the goaf in the temperature monitoring well, and sealing the temperature monitoring well and the exogenous bacterium injection and flora monitoring well;
(4) Starting a circulating water pump, enabling hot water to flow into a heat preservation pipeline from a waste heat water discharge pipe, radiating heat into a goaf through the heat preservation pipeline and a radiating fin, enabling lower-temperature water to flow back to a thermal power plant through a water return pipe, analyzing the goaf temperature acquired by a temperature sensor, inlet temperature acquired by a thermometer and flow data acquired by a flow control valve through a computer, realizing automatic control, and ensuring that the goaf temperature is maintained at 30-35 ℃;
(5) Injecting a source for soaking straw or injecting exogenous bacterial liquid into the goaf through an exogenous bacterial injection and flora monitoring well, collecting liquid in the goaf through the exogenous bacterial injection and flora monitoring well after 15 days, and monitoring flora metabolism and environment through indexes such as flora identification, growth characteristics, biological enzyme activity and metabolism rate;
(6) The biogas produced by the straw is discharged upwards from the biogas collection and transportation well and is collected in the gas collection device;
the method comprises the steps of (1) implementing the steps, simultaneously, drilling a plurality of underground water monitoring wells downwards from the ground with the horizontal distance of 10m, 30m and 50m from the goaf, installing an underground water remote measuring terminal in the underground water monitoring wells, monitoring the water level, water temperature and water quality parameters of underground water outside the goaf for a long time and automatically storing monitoring data in the process of straw gas production, dynamically analyzing the change rule of the underground water, and preventing the problem of underground water pollution;
and (3) while the step (1) is implemented, an on-line monitoring and early warning terminal, a GPS and a total station are installed on the ground with the horizontal distances of 20m, 50m, 100m and 500m from the goaf to monitor the displacement and cracks of the goaf and the peripheral ground surface in real time, and the displacement and cracks are compared with the ground surface of the goaf which is not filled with straws, so that the attenuation degree of ground surface subsidence is evaluated.
2. The gas production process of the mine goaf filling straw biogas production system as claimed in claim 1, wherein: and (6) if a plurality of goaf areas exist in the range of one mine, collecting and conveying the biogas generated by the goaf areas through paving special pipelines on the ground.
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| CN108643971B (en) * | 2018-04-30 | 2019-05-28 | 西安科技大学 | The construction method of down-hole oil-gas storage cavern |
| CN110259504B (en) * | 2019-07-02 | 2021-03-02 | 河南工程学院 | Method and device for reinforcing goaf gas treatment by using microorganisms |
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