CN113756710B - Gangue hill spontaneous combustion drilling and extinguishing integrated device - Google Patents
Gangue hill spontaneous combustion drilling and extinguishing integrated device Download PDFInfo
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- CN113756710B CN113756710B CN202111059716.5A CN202111059716A CN113756710B CN 113756710 B CN113756710 B CN 113756710B CN 202111059716 A CN202111059716 A CN 202111059716A CN 113756710 B CN113756710 B CN 113756710B
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- 238000005553 drilling Methods 0.000 title claims abstract description 29
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 19
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 115
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 104
- 238000003860 storage Methods 0.000 claims abstract description 67
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 52
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 239000000243 solution Substances 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 239000002893 slag Substances 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims description 10
- 239000002699 waste material Substances 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000003245 coal Substances 0.000 abstract description 29
- 239000007864 aqueous solution Substances 0.000 abstract description 8
- 230000035699 permeability Effects 0.000 abstract description 4
- 239000007921 spray Substances 0.000 abstract description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 3
- 238000005336 cracking Methods 0.000 description 17
- 238000000034 method Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 238000009834 vaporization Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000037452 priming Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/04—Measuring depth or liquid level
-
- 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
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
- E21D9/002—Injection methods characterised by the chemical composition used
-
- 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
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/02—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires by wetting or spraying
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Geophysics (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Soil Sciences (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a gangue hill spontaneous combustion drilling and killing integrated device, which comprises Ca (OH) 2 Solution supply assembly, liquid C0 2 The device comprises a cylindrical drill rod, wherein the outer wall of the cylindrical drill rod is provided with a pressure relief hole and a spiral slag discharge groove, and a liquid nitrogen storage tank, a heating sealing push plate and a liquid C0 are arranged in the cylindrical drill rod 2 Lower storage tank, one-way valve and liquid C0 2 Upper storage tank, liquid C0 2 Lower storage tank, liquid C0 2 The side wall of the upper storage tank is respectively wound with a high-temperature resistance wire, the top of the cylindrical drill rod is provided with an orifice plugging device with a pressure valve, the drill bit is provided with a heat source sensor, a liquid nitrogen storage chamber and a second one-way valve are arranged in the drill bit from bottom to top, and the side wall of the drill bit is provided with spray holes which are uniformly distributed in circumference. The liquid nitrogen is injected to cool the gangue body very rapidly, thus realizing the segmented delay presplitting permeability improvement and high pressure Ca (OH) 2 The contact position of the aqueous solution is deepened, the hidden danger of re-burning can be thoroughly solved, and the content of sulfide in the coal gangue hill can be effectively reduced.
Description
Technical Field
The invention relates to the technical field of coal gangue spontaneous combustion fire control, in particular to an integrated device for detecting and controlling high-temperature heat sources of coal gangue hills.
Background
Coal is used as a main energy source in China, the annual consumption is more than 40 hundred million tons, and the annual consumption tends to rise year by year. The coal gangue is used as a byproduct, the annual yield accounts for 10% -20% of the coal yield, and the main treatment mode is open-air accumulation. The inside of the material contains sulfide to produce physical and chemical reaction, waste resource and pollute ecological environment. The pyrite is easy to generate slow oxidation reaction at a lower temperature, and because the gangue hill is internally provided with cracks which are communicated with the external environment and have good heat storage conditions, the coal gangue hill is easy to generate spontaneous combustion phenomenon, and the explosion danger is caused by mixing dangerous gases such as gas. The high temperature heat source of the gangue hill is too high in temperature, and if water is directly used for extinguishing fire, large-scale explosion is most likely to be caused. The traditional coal gangue hill spontaneous combustion treatment mode comprises the following steps: excavating surface soil to cover and tamp loess so as to suppress heat sources or directly punching and grouting. However, the two methods have certain limitations, the former has certain treatment effect only on shallow high-temperature heat sources, but the engineering quantity is large, the working environment is poor, and the danger is high. The latter is that the closer to the center temperature of the self-ignition point, the higher the temperature is, the more holes can be reserved on the surface of the heat source, and the injected slurry has poor slurry fluidity and water retention property due to the internal structure of the gangue hill, so that the self-ignition point can not be accurately reached; the coal gangue hill has the characteristics of large volume, high dispersity, large range, strong concealment and the like, so that the drilling engineering quantity is large, the operation process is complex, the economic cost is high, the safety is low, and the grouting fire extinguishing effect has certain limitation.
Disclosure of Invention
The invention aims to provide an integrated device for spontaneous combustion drilling and extinguishing of a gangue dump, which can effectively detect and eliminate a high-temperature heat source in the gangue dump and improve the safety of the gangue dump.
The technical scheme adopted by the invention is as follows: an integrated device for spontaneous combustion drilling and killing of gangue hill comprises Ca (OH) 2 Solution supply assembly, liquid C0 2 Pumping assembly, pre-splitting device and drill bit, said Ca (OH) 2 The solution supply assembly includes Ca (OH) 2 Solution tank, high-pressure pump and conveying hose, said liquid C0 2 The pumping assembly includes a liquid C0 2 A tank, an electric pump and a delivery hose; the presplitting device comprises a cylindrical drill rod with pressure relief holes and spiral slag discharge grooves on the outer wall, wherein each pressure relief hole is internally provided with a pressure-resistant sheet, and the cylindrical drill rod is internally provided with a pressure-resistant sheet from bottom to top in sequenceIs provided with a liquid nitrogen storage tank, a heating sealing push plate and a liquid C0 2 Lower storage tank, one-way valve and liquid C0 2 Upper storage tank, the liquid C0 2 Lower storage tank, liquid C0 2 The side wall of the upper storage tank is respectively wound with a high-temperature resistance wire, the bottom of the cylindrical drill rod is provided with a conical internal threaded hole for connecting with the conical head at the top of the drill bit, the side wall of the cylindrical drill rod is directly opposite to the liquid nitrogen storage tank and is provided with a liquid nitrogen filling one-way valve, the top of the cylindrical drill rod is provided with an orifice plugging device with a pressure valve, and the Ca (OH) is provided with a high-temperature resistance wire 2 Solution supply assembly, liquid C0 2 The pumping assembly is connected to the top of the pre-splitting device after being converged by the tee pipe; the drill bit adopts a hollow structure, a heat source sensor is arranged on the drill bit, a liquid nitrogen storage chamber and a second one-way valve are arranged in the drill bit from bottom to top, spraying holes uniformly distributed in circumference are formed in the side wall of the drill bit and are connected with the liquid nitrogen storage chamber, and Ca (OH) is formed in the drill bit 2 The filling pressure provided by the solution supply assembly is larger than the opening pressure of the pressure valve, and the opening pressure of the pressure release hole of the cylindrical drill rod is larger than the opening pressure of the second one-way valve.
As the preferable proposal, the main body of the heating sealing push plate is a sliding push plate, a heating resistor is arranged on the sliding push plate, and the sliding push plate can store liquid nitrogen in a liquid nitrogen storage tank and liquid C0 2 The lower storage tanks slide up and down, so that the liquid nitrogen storage tank and the liquid C0 are changed 2 The volume of the lower storage tank is sealed and heated.
Further preferably, the liquid nitrogen storage tank and the liquid C0 2 And limiters are respectively arranged on the lower storage tanks to limit the upper and lower strokes of the heating sealing push plate.
Still preferably, the pressure release holes are arranged in a plurality of groups from top to bottom, each group is uniformly distributed in circumference, part of the pressure release holes incline downwards in a horizontal manner by 45 degrees, part of the pressure release holes incline upwards in a horizontal manner by 45 degrees, and the inclination directions of the pressure release holes in the same group are consistent.
Further preferably, the gangue hill spontaneous combustion drilling and killing integrated device further comprises a control console, a main line extending longitudinally is arranged on the cylindrical drill rod in a penetrating mode, a heat source sensor wire harness on the drill bit is connected with the main line at the joint of the drill bit, and the high-heat resistance wire and the heating sealing push plate are connected with the control console through the main line.
It is further preferred that the orifice plugging devices are arranged in a total of two and vertically adjacent way, and each orifice plugging device is provided with a pressure valve.
Further preferably, the three injection holes uniformly distributed in the circumference are arranged in an inclined way to form a triangular cone.
The invention has the beneficial effects that: the device integrates the functions of spontaneous combustion drilling, detection and extinguishing of the gangue hill, can effectively detect the vertical depth of a high-temperature heat source, injects liquid nitrogen to cool the gangue body at a high speed, and simultaneously sprays liquid nitrogen to cool the drill bit, so that the operation period is shortened, the cost is reduced, the safety level of the device is increased, and the reliability is enhanced; can realize sectional delay pre-cracking permeability increase, increase the cracks of gangue after two blasting and increase Ca (OH) under high pressure 2 The contact position of the aqueous solution is deepened, so that the hidden danger of re-burning can be thoroughly solved; while high pressure Ca (OH) 2 The water solution is used for plugging the hole opening of the drill hole and entering the crack after blasting, the main crack further increases the range of fire extinguishment, improves the efficiency and the safety of fire extinguishment of the gangue hill, and is Ca (OH) 2 Can effectively reduce the content of sulfide in the gangue hill and reduce the damage to the environment.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a sectional view D-D of fig. 1.
Fig. 3 is a schematic structural view of a drill bit.
Fig. 4 is a use state diagram of the present invention.
FIG. 5 is a graph showing a temperature distribution of a heat source of the coal gangue hill.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
referring to FIGS. 1-3, an integrated device for spontaneous combustion drilling and killing of gangue hill is mainly composed of Ca (OH) 2 Solution supply assembly A, liquid C0 2 Pumping assembly B, pre-fracturing device C and drill bit 1.
Ca(OH) 2 The solution supply assembly A consists essentially of Ca (OH) 2 The solution tank 2, the high-pressure pump 3 and the conveying hose mainly supply Ca (OH) for the pre-cracking device C 2 A solution. Liquid C0 2 Pumping assembly B consists essentially of liquid C0 2 Tank 4, electric pump 5 and delivery hose, mainly supplying liquid C0 to pre-cracking device C 2 Liquid C0 2 Filling in liquid C0 2 In tank 4.
The outer wall of the cylindrical drill rod 6 of the pre-cracking device C is provided with a pressure relief hole 6a and a spiral slag discharge groove 6b. The pre-cracking device C adopts the structure form of an inner hollow drill rod, and can automatically discharge slag in the drilling process by using the spiral slag discharge groove 6b of the drill rod. The pressure release holes 6a are communicated with the inner cavity of the cylindrical drill rod 6, each pressure release hole 6a is internally provided with a pressure resistant sheet (not shown in the figure), and when the pressure in the inner cavity of the cylindrical drill rod 6 exceeds the limit pressure resistance value of the pressure resistant sheet, the pressure resistant sheet is opened to release pressure. Preferably, the pressure release holes 6a are arranged from top to bottom, three groups are uniformly distributed circumferentially, part of the pressure release holes 6a incline downwards at 45 degrees, part of the pressure release holes 6a incline upwards at 45 degrees, and the inclination directions of the pressure release holes 6a in the same group are consistent.
A liquid nitrogen storage tank 7, a heating sealing push plate 8 and a liquid C0 are sequentially arranged in the cylindrical drill rod 6 from bottom to top 2 Lower storage tank 9, one-way valve 10 and liquid C0 2 Upper reservoir 11. Liquid C0 2 Lower reservoir 9, liquid C0 2 The side walls of the upper storage tank 11 are respectively wound with high-heat resistance wires 15 for heating the respective storage tanks, and the high-heat resistance wires are preferably arranged on the inner walls of the storage tanks.
A conical internal threaded hole is formed in the bottom of the cylindrical drill rod 6 for connection with the top conical head of the drill bit 1. The side wall of the cylindrical drill rod 6 is directly opposite to the liquid nitrogen storage tank 7 and is provided with a liquid nitrogen filling check valve 12 for adding liquid nitrogen into the liquid nitrogen storage tank 7. An orifice plugging device 14 with a pressure valve 13 is arranged at the top of the cylindrical drill rod 6 and is used for plugging the orifice after drilling. Preferably, the orifice plugging devices 14 are arranged in two and adjacent to each other, and each orifice plugging device 14 is provided with a pressure valve 13.Ca (OH) 2 Solution supply assembly A, liquid C0 2 The pumping assembly B joins the top of the presplitting device C after joining through a tee 19.
The drill bit 1 adopts a hollow structure, and the front end of the drill bit 1 is provided with four-wing drill points. The drill bit 1 is provided with a heat source sensor 16, a liquid nitrogen storage chamber 17 and a second one-way valve 18 are arranged in the drill bit 1 from bottom to top, and spraying holes 1a which are uniformly distributed circumferentially are arranged on the side wall of the drill bit 1 and are connected with the liquid nitrogen storage chamber 17. The number of the injection holes 1a uniformly distributed in the circumference is preferably three, and the three injection holes 1a are obliquely arranged to form a triangular cone. After the drill bit 1 is connected with the pre-splitting device C, the liquid nitrogen storage tank 7 can charge nitrogen into the liquid nitrogen storage chamber 17 through the second one-way valve 18 and then spray out through the spray hole 1 a.
The main body of the heating sealing push plate 8 is a sliding push plate, a heating resistor is arranged on the sliding push plate, and the sliding push plate can store liquid nitrogen in the liquid nitrogen storage tank 7 and liquid C0 2 The lower storage tanks 9 slide up and down so as to change the liquid nitrogen storage tank 7 and the liquid C0 2 The volume of the lower storage tank 9 is sealed and heated. Preferably, the liquid nitrogen storage tank 7, liquid C0 2 The lower storage tank 9 is respectively provided with a limiter 20 for limiting the up-and-down travel of the heating sealing push plate 8.
The gangue hill spontaneous combustion drilling and killing integrated device also comprises a control console 21. The cylindrical drill rod 6 is penetrated with a main line 22 extending longitudinally, a wire harness of the heat source sensor 16 on the drill bit 1 is connected with the main line 22 at the joint of the drill bit, and the high-heat resistance wire 15 and the heating sealing push plate 8 are connected with the control console 21 through the main line 22.
The heat source sensor 16 is arranged in the center of the drill bit 1, and heat insulation materials are arranged around the heat source sensor, so that the interference of heat of the drill bit on the sensor in the drilling process is avoided.
Ca(OH) 2 The solution supply assembly a provides a priming pressure that is greater than the opening pressure of the pressure valve 13 to ensure that the pressure valve 13 is open and a priming orifice plugging device 14 for plugging the orifice of the borehole. Preferably, the opening pressure of the first check valve 10 is 0.5MPa, when in the liquid state C0 2 Upper storage tank 11 and liquid C0 2 When the pressure difference of the lower storage tank 9 is more than 0.5MPa, the liquid C0 2 The liquid stored in the upper storage tank 11 enters liquid C0 2 A lower storage tank 9; liquid C0 2 The pressure in the lower storage tank 9 reaches300MPa, the check valve 10 is reversely locked. The opening pressure of the second check valve 18 is 2.5Mpa, and when the pressure in the liquid nitrogen storage tank 7 reaches 2.5Mpa, liquid nitrogen in the liquid nitrogen storage tank 7 enters the drill bit 1. The opening pressure of the pressure release hole of the cylindrical drill rod 6 is larger than the opening pressure of the second one-way valve 18.
A method for preventing and treating spontaneous combustion fire of coal gangue comprises the following steps:
firstly, performing on-site investigation on a coal gangue hill, and determining a high-temperature heat source horizontal range and a heat source temperature distribution diagram of the coal gangue hill; as shown in fig. 5, the high-temperature early-warning value t is classified according to the heat source temperature of the coal gangue hill: the first level is that when the internal temperature of the coal gangue hill reaches 200-400 ℃, the coal gangue hill is spontaneous-burned, and harmful gas is resolved, belonging to the high Wen Fengxian zone; the second level is that the internal temperature of the gangue hill is 100-200 ℃, and part of gangue has spontaneous combustion risk, belonging to the medium-high Wen Fengxian zone; the three stages are that the internal temperature of the coal gangue hill is 60-100 ℃, which is relatively safe, but the danger is possible to happen, and the coal gangue hill belongs to a low-high temperature risk zone.
Secondly, the gangue hill spontaneous combustion drilling and killing integrated device is ready and performs liquid nitrogen and liquid C0 2 Is filled.
The liquid nitrogen filling amount can be adjusted according to the condition of the high temperature point of coal gangue fire extinguishing, and the upper limiter and the lower limiter limit the maximum filling amount.
Starting a filling pump, filling liquid nitrogen into the liquid nitrogen storage tank 7 through the liquid nitrogen filling one-way valve 12, moving the heating sealing push plate 8 to the position of the lower limiter 20 before starting filling, and starting to move the heating sealing push plate 8 upwards along with filling until the liquid nitrogen filling amount reaches a set value or stopping filling when the heating sealing push plate 8 moves to the position of the upper limiter 20.
Filling liquid C0 after liquid nitrogen is filled 2 To be in liquid state C0 2 After the upper storage tank 11 is filled, the tank is continuously pressurized, and the liquid C0 is filled through the one-way valve 10 2 Liquid C0 is added into the lower storage tank 9 2 Until full.
Thirdly, drilling and detecting operations, and circling the vertical range of the high-temperature point of the coal gangue dump.
According to the firstThe first level determined in the step is the highest priority, the third level is the lowest priority, and drilling holes vertically downwards according to the order of the priorities to treat the coal gangue spontaneous combustion high-temperature heat source; each borehole is equipped with a prefracture device C and a drill bit 1, all of which share a set of Ca (OH) 2 Solution supply assembly A, liquid C0 2 Pumping assembly B as shown in fig. 4.
And selecting a center position to vertically drill downwards above the range of the determined high-temperature heat source. The gangue hill spontaneous combustion drilling and extinguishing integrated device continuously rotates to vertically downwards travel and drill under the action of the motor, broken stone is upwards discharged through the spiral slag discharge groove 6b on the pre-cracking device C, the heat source sensor 16 continuously detects the gangue temperature at the front end of the drill bit 1, and an operator continuously monitors the heat source sensor 16 through the control console 21 to feed back the temperature. When the detected temperature reaches the high-temperature early warning value t, the drill bit 1 is represented to reach the upper boundary of the high-temperature heat source point of the gangue hill, the distance between the upper boundary and the ground surface is m, the drill bit 1 is controlled by the control console 21 to stop drilling, and the drill bit is heated to the liquid state C0 through the heating sealing push plate 8 2 Liquid C0 in the lower tank 9 2 Slowly heating to obtain liquid C0 2 The pressure rise in the lower tank 9 pushes the heat seal push plate 8 forward to increase the pressure of the liquid nitrogen tank 7. When the pressure of the liquid nitrogen storage tank 7 reaches the opening pressure of the second check valve 18, the liquid nitrogen is sprayed out to cool the coal gangue through the spraying hole 1a of the drill bit 1. When the temperature of the gangue in front of the drill bit fed back by the heat source sensor 16 falls below the lower limit of the high-temperature early warning value t, the drill bit is started to drill downwards again, and the operation is repeated until the temperature fed back by the heat source sensor 16 continuously falls below the high-temperature early warning value t, wherein the temperature represents that the drill bit 1 reaches the lower boundary of the high-temperature heat source of the gangue dump, the distance between the lower boundary and the ground surface is n, and the vertical range of the high-temperature point of the gangue dump is defined as n-m.
In the third step, when the drill bit is overheated, liquid nitrogen is sprayed out through the spraying hole 1a of the drill bit 1 to cool the drill bit.
And fourthly, selecting the position of the pre-cracking point, and carrying out sectional delay pre-cracking reflection increase.
And selecting a pre-cracking point position in a vertical depth range of the high-temperature point of the coal gangue hill defined in the third step, wherein the distance from the pre-cracking point position H to the surface of the coal gangue hill is (m+n)/2. If the upper boundary of the detected high-temperature heat source is 2.28m from the ground surface, and the lower boundary is 3.44m from the ground surface, namely m is 2.28m, n is 3.44m, the depth H of the anti-reflection point is 2.86m.
The center of the pre-cracking device is positioned at the pre-cracking point position by reversing the motor, and the pre-cracking device is firstly moved to liquid C0 2 The high-temperature resistance wire 15 in the lower storage tank 9 is electrified and the liquid state C0 2 The instant heat absorption vaporization expands at a high speed, and the first check valve 10 is reversely locked in the expansion process. 0.1-0.3 s of backward liquid C0 2 The high-temperature resistance wire 15 of the upper storage tank 11 is electrified and the liquid state C0 2 Instantaneous endothermic vaporization expansion at high speed through liquid C0 2 The pressure relief holes of the upper storage tank 11 are discharged, and two liquid C0 s 2 Liquid C0 in storage tank 2 After the pressure-resistant sheet of the pressure relief hole 6a is successively broken through by shock waves generated by endothermic vaporization, the gaseous state C0 2 And the gangue is discharged from the pressure relief hole 6a to generate a huge impact on the gangue in the range of the drilling section, so that the interior of the gangue is sheared along the natural cracks to generate main cracks, and the temperature is reduced to generate a choking environment to prevent the high-temperature heat source from being oxidized continuously.
Fifth step, high pressure Ca (OH) 2 And pouring the aqueous solution, cooling and removing sulfur.
By Ca (OH) 2 Solution supply assembly A to liquid C0 2 The upper storage tank 11 is filled with Ca (OH) 2 Aqueous solution, ca (OH) 2 When the aqueous solution passes through the pressure valve 13 of the orifice plugging device 14 at the top of the pre-cracking device C, ca (OH) is generated due to the fact that the water pressure is higher than that of the pressure valve 13 2 The aqueous solution fills the orifice plugging device 14 and the plugging device expands, thereby effecting the closure of the borehole. Then high-pressure Ca (OH) 2 The sulfur-containing gas is discharged through the pressure relief hole 6a and injected into a main crack generated by presplitting, so that the effects of reducing the temperature of a heat source and extinguishing fire are further achieved, and meanwhile, the sulfur-containing gas in the coal gangue hill is effectively removed.
The method comprises the steps of carrying out plane grading division on the temperature of a heat source of the coal gangue hill, fixing the vertical depth range of a high-temperature point of the coal gangue hill by a drilling operation circle, and further selecting a pre-cracking point position to carry out sectional time-delay pre-cracking permeability improvement and high-pressure Ca (OH) 2 And pouring the aqueous solution, cooling, removing sulfur and the like to realize the integrated control treatment of spontaneous combustion fire drilling and extinguishing of the coal gangue. The method comprisesThe method can effectively detect the vertical depth of the high-temperature heat source, select the optimal position to set the pre-cracking point, jet liquid nitrogen to cool the gangue body at a high speed in the drilling process, change the thermodynamic property of the gangue body, and simultaneously jet liquid nitrogen to cool the drill bit, so that the operation period is shortened, the cost is reduced, the safety level of the device is increased, and the reliability is enhanced; the drill holes penetrate through the whole high-temperature heat source area, fire is extinguished not only on the surface of the heat source, but also by adopting the sectional delay presplitting permeability improvement and changing the pressure release direction, the generation and development of a fracture network are further promoted, the presplitting effect and range are increased, and the high-pressure Ca (OH) is matched 2 The pressure injection function improves the pertinence and the effectiveness of fire extinguishing measures, ca (OH) 2 The aqueous solution can effectively remove H while extinguishing fire 2 S、SO 2 And the sulfuration gas is equalized, so that the fire extinguishing efficiency and safety of the coal gangue hill are improved.
Claims (7)
1. Waste dump spontaneous combustion drilling goes out integrated device, its characterized in that: comprises Ca (OH) 2 Solution supply assembly (A), liquid C0 2 Pumping assembly (B), pre-splitting device (C) and drill bit (1), said Ca (OH) 2 The solution supply assembly (A) comprises Ca (OH) 2 Solution tank (2), high-pressure pump (3) and delivery hose, said liquid C0 2 The pumping assembly (B) comprises a liquid C0 2 A tank (4), an electric pump (5) and a conveying hose; the presplitting device (C) comprises cylindrical drill pipes (6) with pressure relief holes (6 a) and spiral slag discharge grooves (6 b) on the outer wall, pressure-resistant sheets are arranged in each pressure relief hole (6 a), and a liquid nitrogen storage tank (7), a heating sealing push plate (8) and a liquid C0 are sequentially arranged in the cylindrical drill pipes (6) from bottom to top 2 Lower storage tank (9), one-way valve (10) and liquid C0 2 An upper storage tank (11), the liquid C0 2 Lower storage tank (9), liquid C0 2 The side wall of the upper storage tank (11) is respectively wound with a high thermal resistance wire (15), the bottom of the cylindrical drill rod (6) is provided with a conical internal threaded hole for being connected with the top conical head of the drill bit (1), the side wall of the cylindrical drill rod (6) is directly opposite to the liquid nitrogen storage tank (7) to open a hole and is provided with a liquid nitrogen filling one-way valve (12), the top of the cylindrical drill rod (6) is provided with an orifice plugging device (14) with a pressure valve (13), and the Ca (OH) 2 Solution supply assembly (A), liquid C0 2 The pumping assembly (B) is connected to the top of the pre-splitting device (C) after being converged by the tee pipe (19); the drill bit (1) adopts a hollow structure, a heat source sensor (16) is arranged on the drill bit (1), a liquid nitrogen storage chamber (17) and a second one-way valve (18) are arranged in the drill bit (1) from bottom to top, injection holes (1 a) which are uniformly distributed circumferentially are formed in the side wall of the drill bit (1) and are connected with the liquid nitrogen storage chamber (17), and Ca (OH) is formed in the drill bit 2 The filling pressure provided by the solution supply assembly (A) is larger than the opening pressure of the pressure valve (13), and the opening pressure of the pressure release hole of the cylindrical drill rod (6) is larger than the opening pressure of the second one-way valve (18).
2. The integrated waste dump self-ignition drilling and killing device according to claim 1, wherein: the main body of the heating sealing push plate (8) is a sliding push plate, a heating resistor is arranged on the sliding push plate, and the sliding push plate can be arranged in a liquid nitrogen storage tank (7) and a liquid C0 2 The lower storage tanks (9) slide up and down so as to change the liquid nitrogen storage tank (7) and the liquid C0 2 The volume of the lower storage tank (9) is sealed and heated.
3. The integrated waste dump self-ignition drilling and killing device according to claim 1, wherein: the liquid nitrogen storage tank (7) and the liquid C0 2 And limiters (20) are respectively arranged on the lower storage tank (9) to limit the upper and lower strokes of the heating sealing push plate (8).
4. The integrated waste dump self-ignition drilling and killing device according to claim 1, wherein: the pressure relief holes (6 a) are formed by arranging a plurality of groups from top to bottom, wherein each group is uniformly distributed in a circumference manner, part of the pressure relief holes (6 a) incline downwards in a horizontal manner by 45 degrees, part of the pressure relief holes (6 a) incline upwards in a horizontal manner by 45 degrees, and the inclination directions of the pressure relief holes (6 a) in the same group are consistent.
5. The integrated waste dump self-ignition drilling and killing device according to claim 1, wherein: the drill bit is characterized by further comprising a control console (21), wherein a main line (22) extending longitudinally is arranged on the cylindrical drill rod (6) in a penetrating mode, a heat source sensor (16) wire harness on the drill bit (1) is connected with the main line (22) at the joint of the drill bit, and the high-temperature resistance wire (15) and the heating sealing push plate (8) are connected with the control console (21) through the main line (22).
6. The integrated waste dump self-ignition drilling and killing device according to claim 1, wherein: the orifice plugging devices (14) are arranged in two and vertically adjacent ways, and each orifice plugging device (14) is provided with a pressure valve (13).
7. The integrated waste dump self-ignition drilling and killing device according to claim 1, wherein: the three injection holes (1 a) are uniformly distributed circumferentially, and the three injection holes (1 a) are obliquely arranged to form a triangular cone.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102838974A (en) * | 2012-08-03 | 2012-12-26 | 煤炭科学研究总院 | Drilling flushing fluid for gangue dump |
| WO2019200821A1 (en) * | 2018-04-18 | 2019-10-24 | 中国矿业大学 | Temperature measuring-while-drilling apparatus for detecting autoignition temperature of coal |
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- 2021-09-10 CN CN202111059716.5A patent/CN113756710B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102838974A (en) * | 2012-08-03 | 2012-12-26 | 煤炭科学研究总院 | Drilling flushing fluid for gangue dump |
| WO2019200821A1 (en) * | 2018-04-18 | 2019-10-24 | 中国矿业大学 | Temperature measuring-while-drilling apparatus for detecting autoignition temperature of coal |
Non-Patent Citations (1)
| Title |
|---|
| 王恩 ; .煤矸石山深孔注浆灭火的研究.洁净煤技术.(第06期),第86-88页. * |
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