CN117365634A - Coal-based solid waste and power plant flue gas collaborative lane-by-lane filling treatment method - Google Patents
Coal-based solid waste and power plant flue gas collaborative lane-by-lane filling treatment method Download PDFInfo
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- 238000011049 filling Methods 0.000 title claims abstract description 271
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 239000003546 flue gas Substances 0.000 title claims abstract description 118
- 239000003245 coal Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 69
- 239000002910 solid waste Substances 0.000 title claims abstract description 46
- 238000005065 mining Methods 0.000 claims abstract description 105
- 238000002347 injection Methods 0.000 claims abstract description 74
- 239000007924 injection Substances 0.000 claims abstract description 74
- 239000000463 material Substances 0.000 claims abstract description 61
- 239000007789 gas Substances 0.000 claims abstract description 59
- 238000012544 monitoring process Methods 0.000 claims abstract description 45
- 238000005553 drilling Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 9
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- 238000003756 stirring Methods 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 7
- 238000001179 sorption measurement Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000011278 co-treatment Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 239000010881 fly ash Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 4
- 238000009533 lab test Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 12
- 238000005429 filling process Methods 0.000 description 7
- 238000004873 anchoring Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention provides a coal-based solid waste and power plant flue gas collaborative lane-by-lane filling treatment method. Constructing a mining and filling connecting roadway between two roadways formed by a longwall coal mining method, arranging filling pipelines and porous air pressure film type air injection pipelines in the roadways, and respectively transporting coal-based solid waste cementing filling materials and power plant flue gas; in the process of filling the connecting roadway, the flue gas of the power plant is lagged by the cementing filling material and is filled into the connecting roadway; the method comprises the steps of adjusting the injection speed of the flue gas of the power plant through monitoring the air quality of a roadway opening, the flue gas conveying quality of the power plant and the components of a roadway-facing drilling filling body; and (3) completing all mining and filling procedures of the mining and filling connecting roadway according to the full-negative-pressure short-wall combined mining and compacting filling method. The invention reasonably utilizes the chemical characteristics of the coal-based solid waste enriched alkaline oxide to absorb, react and store harmful gases in the power plant flue gas, realizes reasonable discharge of the coal-based solid waste and the power plant flue gas, and promotes the coordinated development of mining area resource exploitation and environmental protection.
Description
Technical Field
The invention relates to a coal-based solid waste and power plant flue gas collaborative lane-by-lane filling treatment method, and belongs to the technical field of coal-based solid waste filling treatment.
Background
Accordingly, in order to exert the effect of utilizing coal-based solid waste to realize multifunction, the invention provides a coal-based solid waste and power plant flue gas collaborative treatment method, which is based on the technical cycle of coal-based solid waste and power plant flue gas mining, filling and filling in a filling mode, wherein a mining and filling connecting lane is formed by working in a long-wall working surface, after coal mining is finished, the formation of the mining and filling connecting lane, the preparation of a cemented filling material, the collaborative treatment of the cemented filling material and the power plant flue gas (comprising an uphole multiphase mineralization stirring stage and a downhole gas injection curing mineralization stage), the monitoring feedback of the power plant flue gas treatment effect and the mining, filling and filling in a lane-by-lane filling mode are orderly completed.
Disclosure of Invention
The invention aims to provide a coal-based solid waste and power plant flue gas collaborative lane-by-lane filling treatment method, which aims to achieve reasonable treatment and emission of the coal-based solid waste and the power plant flue gas and fully utilizes the advantages of the lane-by-lane filling process, thereby realizing reasonable treatment, safety and emission reduction of the coal-based solid waste and the power plant flue gas.
In order to achieve the above purpose, the invention provides a coal-based solid waste and power plant flue gas co-treatment method based on a lane-by-lane filling process, which comprises the following steps:
1) Forming a mining and filling connecting roadway: according to a production system formed by a longwall coal mining method, a coal mining machine is replaced by an excavating and anchoring integrated machine, and a mining and filling communication roadway is excavated between a transportation roadway and a return air roadway;
2) After forming the roadway, arranging a filling pipe at the highest position of the roadway opening of the mining and filling communication roadway to form a filling pipeline, and hanging air injection pipes (hereinafter referred to as air injection pipes) with air pressure films and porous respiration valves at the middle parts of the left side and the right side of the mining and filling communication roadway to form an air injection pipeline;
3) Co-processing the cemented filling material and the power plant flue gas: the process is divided into an uphole multiphase mineralization stirring stage and an downhole gas injection maintenance mineralization stage, and a cementing filling material and power plant flue gas are respectively injected into a mining and filling communication roadway through a filling pipeline arranged at the highest position of the roadway opening of the mining and filling communication roadway and a gas injection pipeline arranged in the middle of the roadway side, so that coal-based solid waste and CO in the power plant flue gas are achieved x 、SO x 、NO x The reaction and adsorption effects.
Optionally, in an embodiment of the present invention, the method further comprises the following steps 4) and/or 5):
4) Monitoring the flue gas treatment effect of a power plant: the coal-based solid waste and power plant flue gas CO-treatment process is regulated through at least one monitoring procedure of roadway air quality monitoring, power plant flue gas conveying flow monitoring, pipeline conveying pressure monitoring and filling body drilling sampling test, and specifically, CO in air at roadway of a real-time monitoring, collecting and filling connection roadway x 、SO x 、NO x The content of alkaline oxide in the later filling material in the filling communication roadway is measured according to the air pressure in the air injection pipe and the flue gas flow of the power plant, and the flue gas injection amount of the power plant is regulated and controlled in real time by combining the three indexes;
5) The lane-by-lane cyclic picking, filling and filling process comprises the following steps: according to the full-negative-pressure short-wall combined mining and compacting filling method, every adjacent q mining and filling connecting lanes are a group, and the q mining and filling connecting lanes of p groups are filled with power plant flue gas in sequence until the mining, filling and filling operation of the q mining and filling connecting lanes of p groups is completed, wherein p and q are integers.
Alternatively, in an embodiment of the present invention, the total width of each set of q tie lanes is between 13 and 17m.
Optionally, in an embodiment of the present invention, the specific steps of step 1) are as follows:
after a production system is formed according to a longwall coal mining method, after a coal pillar is reserved at a position close to a longwall working face cut hole, a coal mining and filling connection roadway is constructed at a position of a working face upper roadway by utilizing a coal mining and anchoring integrated machine, an isolated coal pillar is reserved at a position of a working face lower roadway, after the step 2) is completed, an artificial filling retaining wall is erected at the working face upper roadway, and the width of the isolated coal pillar is determined by the shearing strength of the section of coal pillar and the lateral pressure of the section of coal pillar filled with a cementing filling material (1):
S 0 ≥kσ xx (1)
Wherein S is 0 The shear strength of the coal pillar is isolated; sigma (sigma) xx To complete the filling once, the maximum lateral pressure of the cementing filling material to the isolated coal pillar; k is a safety coefficient, and 1.3-1.5 is taken.
Alternatively, in an embodiment of the present invention, the lane width of the filling lane in step 1) is 4m to 6m.
Optionally, in an embodiment of the present invention, the specific steps of step 2) are as follows:
the gas injection pipe wall is provided with a plurality of rows of gas injection holes along the pipeline, the gas holes are sealed by a gas pressure film and are provided with a breather valve, when the external pressure of the gas pressure film sensing pipeline reaches 50% of the internal pressure of the pipeline, the breather valve is opened, and flue gas of a power plant in the gas injection pipe is injected into the cementing filling material through the breather valve.
Further alternatively, in an embodiment of the present invention, the sidewall air hole spacing of the gas injection tube is determined by modeling single air holes according to COMSOL Multiphysics software.
In some examples, the gas hole spacing of the gas injection pipe wall is 2.5 m-4.5 m; in other examples, the gas hole spacing of the gas injection pipe wall is 1.5 m-3.0 m.
Further alternatively, in an embodiment of the present invention, the specific steps of step 2) are as follows:
the method comprises the steps of respectively paving pipelines from a ground filling grouting station and a power plant smoke field, selecting a filling pipeline end erection position according to the inclination direction of a filling communication roadway, erecting the filling pipeline end to the highest position of the opening of the filling communication roadway, arranging an air injection pipeline along the bottom of the filling communication roadway, arranging a plurality of rows of air injection holes along the pipeline on the pipe wall of the air injection pipeline, sealing the air holes by an air pressure film, and attaching a breather valve, wherein when the external pressure of the air pressure film sensing pipeline reaches 50% of the internal pressure of the pipeline, the breather valve is opened, and the power plant smoke in the air injection pipeline is injected into a cemented filling material through the breather valve.
Optionally, in the embodiment of the invention, step 3) is required for preparing the cementing filling material, and the material is prepared into paste slurry without critical flow rate and dehydration by mixing coal-based solid waste, cement and water (dry matter proportioning range ((gangue 80% -50%) (fly ash 7.5% -37.5%) (cement 10% -25%) and dry matter mass concentration 70% -90%).
Alternatively, in an embodiment of the invention, the cemented filling material satisfies: the initial setting time is more than 4 hours, the final setting time is less than 24 hours, the early strength (24 hours) reaches 0.1-0.2 MPa, and the later strength (28 d) reaches 1-10 MPa.
Alternatively, in the embodiment of the invention, the maximum adsorbable and reactive quantity M of the cementing filling material and the flue gas of the power plant in the preparation process of each ton is determined through a laboratory flue gas absorption and mineralization integrated test of the power plant.
Further alternatively, in an embodiment of the present invention, the maximum adsorbable, reactive M is 38.5 to 45.5Kg/t per ton of cemented filling material. In one example, the maximum adsorbable, reactive amount M is 40.68Kg/t.
Experiments show that COx, SOx, NOx in the flue gas of the power plant in the process is mainly fixed in a cementing filling material in an adsorption and adhesion state, and then the main chemical reaction with the cementing filling material occurs: (formulae 2) to 7) (in CO 2 Examples):
3(3CaO·SiO 2 )+(3-x)CO 2 +nH 2 O＝xCaO·SiO 2 ·nH 2 O+(3-x)CaCO 3 (2)
2(3CaO·SiO 2 )+(2-x)CO 2 +nH 2 O＝xCaO·SiO 2 ·nH 2 O+(2-x)CaCO 3 (3)
xCaO·SiO 2 ·nH 2 O+xCO 2 ＝SiO 2 ·nH 2 O+xCaCO 3 (4)
3(3MgO·SiO 2 )+(3-x)CO 2 +nH 2 O＝xMgO·SiO 2 ·nH 2 O+(3-x)MgCO 3 (5)
2(3MgO·SiO 2 )+(2-x)CO 2 +nH 2 O＝xMgO·SiO 2 ·nH 2 O+(2-x)MgCO 3 (6)
xMgO·SiO 2 ·nH 2 O+xCO 2 ＝SiO 2 ·nH 2 O+xMgCO 3 (7)
Optionally, in the embodiment of the invention, the step 3) adsorption and reaction of the cemented filling material and the flue gas of the power plant are divided into an uphole multiphase mineralization stirring stage and a downhole gas injection maintenance mineralization stage, and the uphole multiphase mineralization stirring stage is used for introducing the flue gas amount M of the power plant into the sealed cemented filling material equipment 1 In the underground gas injection maintenance mineralization stage, the flue gas quantity M of the power plant is injected into the underground cemented filling material through a gas injection pipeline 2 The theoretical inlet amount of the flue gas injected into the power plant by each ton of the cemented filling material is M 1 +M 2 And meet M 1 +M 2 ＜M。
Further alternatively, in an embodiment of the present invention, M 1 /M 2 0.33 to 0.54.
Optionally, in an embodiment of the present invention, the gas injection timing of the gas injection pipeline in the step 3) lags behind the filling timing of the cemented filling material by 4 h-6 h. In the underground gas injection curing mineralization stage, the cementing filling material is pumped to a mining and filling communication roadway through a filling pump, and after the cementing filling material is filled, the flue gas of the power plant is injected through a gas injection pipeline with a gas pressure membrane porous breather valve for 4-6 hours, so that the flue gas injection time of the power plant at each position of the mining and filling communication roadway is always kept to be 4-6 hours after the cementing filling material is filled. The porous structure formed after the cemented filling material reaches the initial setting state carries out physical adsorption on the power plant flue gas, and then the alkaline oxide in the cemented filling material also gradually reacts with the power plant flue gas.
Optionally, in the embodiment of the present invention, the monitoring procedure in the step 4) refers to real-time monitoring of CO in air at the roadway mouth of the mining and filling communication roadway x 、SO x 、NO x The gas pressure in the porous breather valve gas injection pipe with the gas pressure film and the gas flow of the power plant, and the gas injection amount of the power plant is regulated and controlled in real time by combining the three indexes,
the roadway air quality monitoring means that after the flue gas of the power plant starts to be injected into the mining and filling connection roadway, CO in the air is monitored at roadway positions every 2 hours through a harmful gas detector x 、SO x 、NO x Is contained in the composition;
the power plant flue gas conveying quality monitoring comprises power plant flue gas conveying flow monitoring and pipeline conveying pressure monitoring, namely the change of the power plant flue gas flow and the air pressure in the air injection pipe with the air pressure membrane porous respiration valve is monitored in real time through a ground monitoring system, and accordingly the power plant flue gas injection speed and the power plant flue gas injection quantity are adjusted until the procedure of filling and injecting in the connecting roadway is completed.
Drilling and sampling and monitoring the filling body, drilling and taking a filling body sample from another adjacent mining and filling connecting lane after the working procedures of mining, filling and filling are finished in 28d, testing the content of alkaline oxide in the filling body by laboratory test, judging whether the drilling and filling of the power plant flue gas can be applied to the filling body newly, and adjusting the power plant flue gas injection quantity M of the next mining and filling connecting lane 2 。
Optionally, in an embodiment of the present invention, the specific steps of the monitoring procedure of step 4) are as follows:
after the flue gas of the power plant is injected into the mining and filling communication roadway, monitoring CO in the air at roadway openings every 2h through a harmful gas detector x 、SO x 、NO x Is monitored by the groundThe change of the flue gas flow and the air pressure of the power plant in the gas injection pipe is monitored in real time, and the gas injection speed and the gas injection amount of the power plant are adjusted accordingly until the procedure of filling and injecting in the connecting roadway is completed.
Further optionally, in an embodiment of the present invention, the method for adjusting the detection procedure in the step 4) includes at least one of the following:
monitoring the air quality of the roadway opening, and monitoring CO in the air at the roadway opening every 2h through a harmful gas detector after the flue gas of the power plant starts to be injected into the mining and filling communication roadway x 、SO x 、NO x Is contained in the composition;
detecting the flue gas conveying quality of a power plant, and monitoring the changes of the flow and the air pressure of the flue gas of the power plant in an air injection pipe (4) in real time through a ground monitoring system, so as to adjust the injection speed and the injection quantity of the flue gas of the power plant until the filling and injection procedures of the connecting roadway are completed;
drilling and sampling and monitoring the filling body, punching a hole to the filling body sample in another filling and connecting lane in the process of collecting, filling and filling after the process of collecting, filling and filling is finished in the adjacent collecting, filling and connecting lane, measuring the content of alkaline oxide in the filling body through laboratory test, judging whether the drilling hole can be newly applied to the filling body to inject the flue gas of the power plant or not according to the content, and adjusting the injection quantity M of the flue gas of the power plant in the next filling and connecting lane 2 。
Optionally, in an embodiment of the present invention, the specific steps of step 5) are as follows: the filling flow of the q mining and filling connecting lanes of the p groups is as follows:
a1 A first group of first mining and filling connecting lanes adjacent to the long-wall working face cutting hole are subjected to mining, filling and filling operation;
a2 Repeating step a 1) for the connecting lanes of the same order of the next group of mining and filling connecting lanes until the last group of connecting lane mining, filling and filling operation is completed;
a3 Repeating the steps a 1) -a 2) until the mining and filling operation of the mining and filling connecting lane of the p groups is completed.
Advantageous effects
The method comprises the steps of formation of a mining and filling communication roadway, preparation of a cemented filling material, cooperative treatment of the cemented filling material and power plant flue gas (comprising an uphole multiphase mineralization stirring stage and a downhole gas injection maintenance mineralization stage), monitoring feedback of the treatment effect of the power plant flue gas, and mining, filling and filling process circulation of a roadway-by-roadway filling mode. The characteristics of the coal-based solid waste cemented filling material that is rich in alkaline oxides are utilized, and the multiple aims of no additional chemical finished products, resource utilization of the coal-based solid waste material, emission reduction of the power plant flue gas and the like can be achieved by cooperatively treating the power plant flue gas.
The method utilizes a lane-by-lane filling method to treat solid waste of a coal machine and flue gas of a power plant, reduces exploitation damage through cementing action and supporting action of a cementing filling material, can improve strength of a filling body to a certain extent by absorbing and converting the flue gas of the power plant, has a filling rate of more than 95%, and can be suitable for exploiting coal resources under complex conditions. The method takes the mining and filling connecting roadway as a filling and gas injection unit, has smaller working space than other filling and mining modes, can ensure that the space for the adsorption and reaction of the coal-based solid waste and the flue gas of the power plant is more closed, and can fully utilize and react the alkaline oxide in the coal-based solid waste to achieve the maximum treatment amount of the flue gas of the power plant. The large-scale treatment of the coal-based solid waste and the power plant flue gas reduces the carbon emission and the volume of harmful gas emission in the coal industry, realizes the coordinated development of mining area resource exploitation and environmental protection, promotes the construction of a mine green development method, and has important social significance.
Drawings
FIG. 1 is a flow chart of coal-based solid waste and flue gas collaborative lane-by-lane filling of a power plant;
FIG. 2 is a schematic diagram of a different form of mining and filling tie line arrangement;
FIG. 3 is a schematic view of a process cycle for a multi-set mining and filling communication roadway operation.
Meaning of reference numerals in the drawings:
the method comprises the following steps of 1-mining and filling a connecting roadway, 2-mining and filling a connecting roadway, 3-filling a pipe, 4-porous breather valve type gas injection pipes with pneumatic membranes, 5-isolating coal pillars, 6-filling retaining walls, 7-cementing filling materials, 8-gas injection holes, 9-power plant flue gas, 10-digging and anchoring integrated machines and 11-mining and filling connecting roadways.
Detailed Description
Embodiments of the present invention are further described below with reference to the accompanying drawings.
In order to achieve reasonable disposal and emission of coal-based solid waste and power plant flue gas, the advantages of the lane-by-lane filling process are fully utilized, and therefore reasonable disposal, safety and emission reduction of the coal-based solid waste and the power plant flue gas are achieved. The invention discloses a coal-based solid waste and power plant flue gas collaborative lane-by-lane filling treatment method, which is shown in figure 1 and comprises the steps of formation of a mining and filling communication lane, preparation of a cementing filling material, collaborative treatment of the cementing filling material and the power plant flue gas, monitoring feedback of the power plant flue gas treatment effect and mining, filling and filling process circulation of a lane-by-lane filling mode. Forming a mining and filling connecting roadway by a long-wall coal mining method, and mixing coal-based solid wastes such as mine gangue and the like with cement and water to prepare a cemented filling material after optimizing the proportion; and the mixture is conveyed to a mining and filling communication roadway through a pipeline by using a filling pump.
The following description of the embodiments of the invention refers to the examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Example 1:
the invention provides a coal-based solid waste and power plant flue gas collaborative lane-by-lane filling treatment method for solving the problem of mine coal-based solid waste and power plant flue gas emission treatment and relieving environmental protection pressure.
The method comprises the following specific steps:
(1) Formation of the mining and filling connecting roadway:
as shown in fig. 2 and 3, in the production system formed by using the longwall coal mining method, a coal pillar is reserved at a position close to a longwall working face cut hole, coal is broken by adopting a digging and anchoring integrated machine, and a mining and filling connecting roadway is constructed at a position on the working face, wherein the longwall coal mining working face tends to be 162m long.
By FLAC 3D Under the conditions of 3.0m of the height, 5.4m of the width, 70m of the length and 6 degrees of elevation angle of the mining and filling connecting roadway, the influence of different roadway spacing on the vertical stress distribution of the top plate, the deformation rule of surrounding rock and the stress distribution of the surrounding rock is comprehensively considered, and the mining and filling connecting roadway spacing is 3 times of the roadway width (16.2 m).
And (3) setting an isolation coal pillar 5 at the lower lane of the working face (namely, the lower lane 2 of the mining and filling connecting lane), erecting a manual filling retaining wall 6 at the upper lane of the working face (namely, the upper lane 1 of the mining and filling connecting lane), and calculating the width of the isolation coal pillar to obtain 4.5m according to the shearing strength of the coal pillar and the lateral pressure of the section filled with the cemented filling material.
(2) Preparation of the cemented filling material:
the raw materials mainly comprise gangue, fly ash, cement and water, the influence rule of the mass concentration of the gangue, the fly ash, the cement and dry matters on the conveying performance and the mechanical property of the cemented filling material is measured through a laboratory orthogonal test, and the test finally determines that the dry matter in the cemented filling material comprises the following mixture ratio of the gangue: fly ash: cement = 60%:18%:22%, wherein the particle size of the gangue is 0-5 mm, and the mass concentration of dry matters is 79%.
The prepared cemented filling material is tested by performance test, the initial setting time is 4-5 h, the final setting time is 20h, the early strength (24 h) reaches 0.19MPa, and the later strength (28 d) reaches 6.71MPa.
(3) Co-treatment of the cement filling material and the power plant flue gas:
and determining that the maximum adsorbable and reactive quantity M of the cementing filling material and the flue gas of the power plant in the preparation process of each ton is 40.68Kg/t through a laboratory flue gas absorption and mineralization integrated test.
According to the test of the step (2), determining the material proportion, preparing the cemented filling material, and introducing the flue gas amount M of the power plant into a sealed stirring device 1 The multiphase mineralization phase on the well was completed at 16 t.
After the excavation of the mining and filling connecting roadway 11 is finished, pumping a cementing filling material into the connecting roadway through a filling pipeline, and continuously injecting the smoke quantity M of the power plant into the mining and filling connecting roadway through an air injection pipeline after delay for 4 hours 2 37t.
Specifically, as shown in fig. 2, the steps of filling and gas injection in this embodiment are as follows:
pipeline laying is started from a ground filling grouting station and a power plant smoke field respectively, filling pipeline end erection positions (shown in figure 2) are selected according to the inclination direction of a mining filling communication roadway (11), the filling pipeline end is erected to the highest roadway opening of the mining filling communication roadway, an air injection pipeline is erected along the middle parts of two sides of the mining filling communication roadway 11, and a plurality of rows of air holes are formed in the pipe wall of the air injection pipe 4 with the air pressure film porous breather valve along the pipeline. Specifically, according to COMSOL Multiphysics software, the conditions of the embodiment are simulated to obtain that the air hole spacing on the pipe wall of the air injection pipe is 3.5 m.
The cementing filling material is pumped to the mining and filling communication roadway 11 through a filling pump, and after the cementing filling material starts to be filled, the power plant flue gas is injected into the mining and filling communication roadway 11 through the 4-channel gas injection pipe with the gas pressure membrane porous breather valve, so that the time for injecting the power plant flue gas at each position of the mining and filling communication roadway 11 is always kept to be 4 hours after the filling time of the cementing filling material.
(4) Monitoring feedback of the co-treatment effect of coal-based solid waste and power plant flue gas:
and the coal-based solid waste and power plant flue gas co-treatment process is regulated through roadway air quality monitoring, power plant flue gas conveying quality monitoring and filling body drilling sampling monitoring.
Specifically, the monitoring method in this embodiment is as follows:
the roadway air quality monitoring means that after the flue gas of the power plant starts to be injected into the mining and filling connection roadway 11, CO in the air is monitored at roadway positions every 2 hours through a harmful gas detector x 、SO x 、NO x Is contained in the composition.
The detection of the flue gas conveying quality of the power plant is to monitor the changes of the flow and the air pressure of the flue gas of the power plant in the porous breather valve type air injection pipe 4 with the air pressure film in real time through a ground monitoring system, and accordingly the injection speed and the injection quantity of the flue gas of the power plant are adjusted until the procedure of filling and injecting the connecting roadway is completed.
The drilling and sampling monitoring of the filling body is further carried out, after the filling and collecting connecting lane finishes the working procedures of filling and collecting, 28d, the filling body sample is punched and taken from the connecting lane at the other filling and collecting connecting lane where the adjacent filling and collecting are finished, the content of alkaline oxide in the filling body is measured through laboratory tests, whether the drilling and the injecting of the power plant flue gas can be newly applied to the filling body is judged according to the content, and the power plant flue gas injection quantity M of the next filling and collecting connecting lane is regulated 2 。
(5) And (3) collecting, filling and filling process circulation of a lane-by-lane filling mode:
and according to the lane-by-lane filling method, sequentially completing the working procedures of mining, filling and filling of the 3 mining and filling connecting lanes of 10 groups.
Specifically, as shown in fig. 3, the circulation method in this embodiment is as follows:
according to the full-negative-pressure short-wall combined mining dense filling method, every 3 adjacent mining and filling connecting lanes are a group, and the 3 mining and filling connecting lanes of each group are filled and filled with power plant flue gas in sequence, and the working sequence is as follows:
a1 A first group of first mining and filling connecting lanes adjacent to the long-wall working face cutting hole are subjected to mining, filling and filling operation;
a2 Repeating step a 1) for the same-order mining and filling connection lane of the next group of mining and filling connection lane until the mining, filling and filling operation of the last group of mining and filling connection lane is completed;
a3 Repeating the steps a 1) -a 2) until the mining and filling operation of each group of mining and filling connecting roadways is completed.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (10)
1. The coal-based solid waste and power plant flue gas collaborative lane-by-lane filling treatment method is characterized by comprising the following steps of:
1) A full negative pressure coal mining transportation roadway and a return air roadway formed by a longwall coal mining method are utilized, and a mining and filling connecting roadway (11) is constructed between the two roadways;
2) After the roadway is formed, arranging a filling pipe (3) at the highest position of the roadway opening of the mining and filling communication roadway to form a filling pipeline, and hanging a porous breather valve type gas injection pipe (4) with a pneumatic film at the middle parts of the left side and the right side of the mining and filling communication roadway to form a gas injection pipeline;
3) Injecting a cementing filling material (7) and power plant flue gas (9) into the mining and filling communication roadway (11) through the filling pipeline and the gas injection pipeline respectively to achieve the purposes of coal-based solid waste and CO in the power plant flue gas x 、SO x 、NO x Adsorption and reaction effects.
2. The coal-based solid waste and power plant flue gas collaborative lane-by-lane filling treatment method according to claim 1, further comprising the following step 4) and/or step 5):
4) The coal-based solid waste and power plant flue gas co-treatment process is regulated through at least one monitoring procedure of roadway air quality monitoring, power plant flue gas conveying flow monitoring, pipeline conveying pressure monitoring and filling body drilling sampling testing;
5) According to the full-negative-pressure short-wall joint production dense filling method, every adjacent q connecting lanes are a group, and the q connecting lanes of p groups are filled and injected with power plant flue gas in sequence until the production, filling and injection operation of the q connecting lanes of p groups is completed, wherein p and q are integers; preferably, the total width of each group of q connecting lanes is 13-17 m.
3. The method for collaborative lane-by-lane filling treatment of coal-based solid waste and power plant flue gas according to claim 1, wherein an isolation coal pillar (5) is reserved at the lane opening of a lower lane (2) of the mining and filling connecting lane, a filling retaining wall (6) is additionally arranged at the upper lane opening, and the width of the isolation coal pillar is determined by the shearing strength of the section of coal pillar and the lateral pressure of the filled cemented filling material (formula 1), so that the following steps are ensured:
S 0 ≥kσ xx (1)
Wherein S is 0 The shear strength of the coal pillar is isolated; sigma (sigma) xx To complete the filling once, the maximum lateral pressure of the cementing filling material to the isolated coal pillar; k is a safety coefficient, and 1.3-1.5 is taken.
4. The method for the collaborative lane-by-lane filling treatment of coal-based solid waste and power plant flue gas according to claim 1, wherein in the step 2), a plurality of rows of gas injection holes (8) are formed in the pipe wall of the gas injection pipe along a pipeline, the gas holes are sealed by a gas pressure film and are provided with a breather valve, when the external pressure of the gas pressure film sensing pipeline reaches 50% of the internal pressure of the pipeline, the breather valve is opened, and the power plant flue gas in the gas injection pipe is injected into a cemented filling material through the breather valve; preferably, the air hole spacing of the pipe wall of the gas injection pipe is 2.5 m-4.5 m.
5. The method for the collaborative lane-by-lane filling treatment of coal-based solid waste and power plant flue gas according to claim 1, wherein the step 3) is a paste-like slurry which is prepared by mixing 50-80% of coal gangue, 7.5-37.5% of fly ash and 10-25% of cement according to dry matter proportion and does not need dehydration, wherein the paste-like slurry is prepared from the coal-based solid waste, the cement and the water, and the dry matter mass concentration is 70-90%; preferably, the cemented filling material satisfies: the initial setting time is more than 4 hours, the final setting time is less than 24 hours, the early strength of the 24 hours reaches 0.1-0.2 MPa, and the later strength of the 28 days reaches 1-10 MPa.
6. The method for collaborative lane-by-lane filling treatment of coal-based solid waste and power plant flue gas according to claim 1, wherein in the step 3), the maximum adsorbable and reactive quantity M of each ton of the cementing filling material and the power plant flue gas in the preparation process is determined through a laboratory power plant flue gas absorption and mineralization integrated test.
7. The method for collaborative lane-by-lane filling disposal of coal-based solid waste and power plant flue gas according to claim 6, wherein the adsorption and reaction of the cementing filling material and the power plant flue gas in the step 3) are divided into an uphole multiphase mineralization stirring stage and a downhole gas injection maintenance mineralization stage, and the uphole multiphase mineralization stirring stage introduces the power plant flue gas amount M into sealed cementing filling material equipment 1 In the underground gas injection maintenance mineralization stage, the flue gas quantity M of the power plant is injected into the underground cemented filling material through a gas injection pipeline 2 The theoretical inlet amount of the flue gas injected into the power plant by each ton of the cemented filling material is M 1 +M 2 And meet M 1 +M 2 < M; preferably, wherein M 1 /M 2 0.33 to 0.54.
8. The method for collaborative lane-by-lane filling treatment of coal-based solid waste and power plant flue gas according to claim 1, wherein the gas injection timing of the gas injection pipeline in the step 3) lags behind the filling timing of the cemented filling material by 4-6 h.
9. The method for collaborative lane-by-lane filling disposal of coal-based solid waste and power plant flue gas according to claim 2, wherein the method for adjusting the detection procedure of step 4) comprises at least one of:
monitoring the air quality of the roadway opening, after the flue gas of the power plant starts to be injected into a mining and filling communication roadway (11), monitoring CO in the air at the roadway opening every 2h through a harmful gas detector x 、SO x 、NO x Is contained in the composition;
monitoring the flue gas conveying quality of a power plant, including monitoring the flue gas conveying flow of the power plant and monitoring the pressure of pipeline conveying, monitoring the changes of the flue gas flow and the air pressure of the power plant in an air injection pipe (4) in real time through a ground monitoring system, and adjusting the flue gas injection speed and the injection amount of the power plant according to the changes until the filling and injection procedures of the connecting roadway are completed;
drilling and sampling and monitoring the filling body, drilling and taking a filling body sample from another adjacent mining and filling connecting lane after the working procedures of mining, filling and filling are finished in 28d, testing the content of alkaline oxide in the filling body by laboratory test, judging whether the drilling and filling of the power plant flue gas can be applied to the filling body newly, and adjusting the power plant flue gas injection quantity M of the next mining and filling connecting lane 2 。
10. The method for collaborative lane-by-lane filling treatment of coal-based solid waste and power plant flue gas according to claim 2, wherein the filling flow of p groups of q connecting lanes in the step 5) is as follows:
a1 A first group of first mining and filling connecting lanes adjacent to the long-wall working face cutting hole are subjected to mining, filling and filling operation;
a2 Repeating step a 1) for the connecting lanes of the same order of the next group of mining and filling connecting lanes until the last group of connecting lane mining, filling and filling operation is completed;
a3 Repeating the steps a 1) -a 2) until the mining and filling operation of the mining and filling connecting lane of the p groups is completed.
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