CN113202541B - Intermittent grouting fire prevention and extinguishing system and method between hydraulic supports of fully mechanized mining face of mine - Google Patents
Intermittent grouting fire prevention and extinguishing system and method between hydraulic supports of fully mechanized mining face of mine Download PDFInfo
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- CN113202541B CN113202541B CN202110633053.7A CN202110633053A CN113202541B CN 113202541 B CN113202541 B CN 113202541B CN 202110633053 A CN202110633053 A CN 202110633053A CN 113202541 B CN113202541 B CN 113202541B
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- 238000005065 mining Methods 0.000 title claims description 43
- 230000002265 prevention Effects 0.000 title claims description 36
- 238000000034 method Methods 0.000 title claims description 18
- 238000003756 stirring Methods 0.000 claims abstract description 40
- 230000001105 regulatory effect Effects 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- 238000004537 pulping Methods 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims description 45
- 239000000203 mixture Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 7
- 230000009974 thixotropic effect Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000005553 drilling Methods 0.000 description 8
- 239000003245 coal Substances 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000002269 spontaneous effect Effects 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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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
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/08—Rock dusting of mines; Depositing other protective substances
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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
- 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
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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
- E21F17/18—Special adaptations of signalling or alarm devices
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- Mining & Mineral Resources (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
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- Air Transport Of Granular Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The intermittent grouting fire preventing and extinguishing system consists of main pipeline, first grouting branch pipe, second grouting branch pipe, first grouting branch pipe network, second grouting branch pipe network, electric three-way valve, steel pipe, quantitative adding pump, pulping pond, stirring pump, digital rotary viscometer, control board, control valve, pneumatic grouting pump, pressure meter, flowmeter, pressure equalizer, pressure regulating valve, return air lane, goaf, comprehensive working surface and hydraulic support.
Description
Technical Field
The invention belongs to the field of underground coal mine fire prevention and extinguishment, relates to a grouting, air leakage blocking, fire prevention and extinguishment method for a coal mine goaf, and particularly relates to an intermittent grouting, fire prevention and extinguishment system and method between hydraulic supports of a fully mechanized mining face of a mine.
Background
Mine fire is one of main natural disasters in coal mine production, and according to different ignition sources, mine fire can be divided into internal-cause fire and external-cause fire, wherein 90% -94% of mine fire accidents are caused by the internal-cause fire, and the residual coal spontaneous combustion fire in the goaf accounts for more than 60% of the internal-cause fire. At present, the goaf coal spontaneous combustion is prevented and treated by adopting measures such as yellow mud grouting, inert foam grouting, gel grouting, composite colloid grouting and the like in domestic coal mines. The traditional buried pipe grouting technology has the advantages that slurry flows to a place with low topography in a goaf, the coverage is small, the slurry cannot be accumulated to a high place, and a 'trench pulling' phenomenon is easy to form. Meanwhile, due to the characteristics of porous media of the goaf, the air leakage rule of the goaf is not clear, the natural ignition high-temperature point cannot be determined, the high-position fire source cannot be timely detected, the traditional grouting method cannot be timely and effectively applied to the fire source, and only regional inerting can be carried out on the spontaneous combustion zone of the goaf or high-multiple foaming foam is adopted for large-scale coverage, so that grouting fire prevention and extinguishing cost is high, and the expected effect is difficult to achieve. The gel material grouting has thixotropic property, and the viscosity of the gel material grouting is increased after stirring due to the reduction of shearing force, so that the slurry flows slowly, a pipeline blocking phenomenon occurs, the best fire prevention and extinguishing time is delayed, and the fire prevention and extinguishing efficiency is poor. Therefore, a safe and reliable grouting fire prevention and extinguishing technology is urgently needed to solve the problem that the grouting gel is blocked and the fire source is difficult to determine in the traditional grouting fire prevention and extinguishing method.
Disclosure of Invention
The invention provides an intermittent grouting fire prevention and extinguishing system and method for a hydraulic support of a fully mechanized mining face of a mine, and aims to provide a fire prevention and extinguishing system for laying a grouting pipe network between hydraulic supports of the fully mechanized mining face of the mine to a goaf for intermittent grouting, aiming at solving the problems that gel injection pipe blocking and fire sources are difficult to determine in the traditional grouting fire prevention and extinguishing method.
The invention relates to an intermittent grouting fire prevention and extinguishing system of a hydraulic support frame of a fully mechanized mining face of a mine, which is characterized by comprising the following components: the system comprises a main pipeline, a first grouting branch pipe, a second grouting branch pipe, a first grouting branch pipe network, a second grouting branch pipe network, an electric three-way valve, a steel pipe, a quantitative adding pump, a pulping pool, a stirring pump, a digital display rotary viscometer, a control panel, a pneumatic grouting pump, a control valve, a pressure gauge, a flowmeter, a first pressure equalizer, a second pressure equalizer, a pressure regulating valve, a return air lane, a goaf, a fully mechanized mining working face and a hydraulic support; the hydraulic system is characterized in that the main pipeline is arranged in an air return roadway, a pressure gauge, a flowmeter and a control valve are arranged on the main pipeline, a pneumatic grouting pump is connected to an inlet of the main pipeline, a pressure regulating valve is arranged on the pneumatic grouting pump, a grouting pool is connected with the pneumatic grouting pump, a quantitative adding pump is arranged on the left side of the grouting pool, a stirring pump is arranged right above the pneumatic grouting pump, a digital display rotary viscometer and a control board are arranged on the stirring pump, the pneumatic grouting pump, the digital display rotary viscometer, the stirring pump and an electric three-way valve are connected with the control board, a grouting branch pipe I and a grouting branch pipe II are connected to an outlet of the main pipeline of the fully-mechanized mining face, the grouting branch pipe I and the grouting branch pipe II are paved along a fully-mechanized mining face trend, a pressure equalizer I is arranged on the grouting branch pipe I, a grouting branch pipe I is connected with a grouting branch pipe network, a steel pipe is connected to the end of the grouting branch pipe I, a grouting branch pipe II is connected with a steel pipe II, the end of the grouting branch pipe network II is connected with a steel pipe, a certain inclination angle is arranged in a drilling space of the hydraulic support of the fully-mechanized mining face, and the grouting branch pipe I is sequentially buried in the drilling work face, and the drilling work face is arranged in the drilling space.
The intermittent grouting fire prevention and extinguishing system between the hydraulic supports of the fully mechanized mining face of the mine is characterized in that the length L=H/sin alpha of a grouting branch pipe network I and a grouting branch pipe network II is paved in a goaf, wherein H is the height of a goaf caving zone, and alpha is the included angle between a drilling hole and a bottom plate of the hydraulic support on the fully mechanized mining face.
The intermittent grouting fire prevention and extinguishing system between the hydraulic supports of the fully mechanized mining face of the mine is characterized in that the pressure equalizer is one for realizing equal pressure of each grouting branch pipe of the grouting branch pipe network I, the pressure equalizer is two for realizing equal pressure of each grouting branch pipe of the grouting branch pipe network II, and each grouting branch pipe is provided with 1-3 hydraulic supports at intervals.
The intermittent grouting fire prevention and extinguishing system between the hydraulic supports of the fully mechanized mining face of the mine is characterized in that the length of a steel pipe connected with the first grouting branch pipe network and the two ends of the grouting branch pipe network is 3-5 m, the horizontal distance between the tail ends of the steel pipe and the hydraulic supports is 10-20 m, and the tail ends of the steel pipe are airtight.
The intermittent grouting fire prevention and extinguishing system between the hydraulic supports of the fully mechanized mining face of the mine is characterized in that the main pipeline 1, the grouting branch pipe I2 and the grouting branch pipe II 3 are high-pressure rubber pipes, and the grouting branch pipe I4 and the grouting branch pipe II 5 are seamless steel pipes.
The fire prevention and extinguishing method implemented based on the intermittent grouting fire prevention and extinguishing system between the hydraulic supports of the fully mechanized mining face of the mine comprises the following steps:
(1) The thixotropic gel material was mixed with water by the metering pump 8 according to 1:4 or 1:5 or 1:6, putting the mixture into a pulping tank 9 in proportion, and stirring the mixture by a stirring pump 10 to prepare a slurry;
(2) When the viscosity of the slurry is 40 mPa.s-80 mPa.s, a control valve 14 on a main pipeline 1 is opened, an electric three-way valve 6 is regulated by a control board 12 to be communicated with the main pipeline 1 to a grouting branch pipe I2, the grouting branch pipe II 3 is closed, a pneumatic grouting pump 13 is started to inject the slurry into a goaf 21 through a grouting branch pipe I4, grouting is started for 20-30 min, then the electric three-way valve 6 is regulated by the control board 12 to be communicated with the main pipeline 1 to a grouting branch pipe II 3, the grouting branch pipe I2 is closed, the pneumatic grouting pump 13 continuously injects the slurry into the goaf 21 through the grouting branch pipe I5, grouting is performed for 20-30 min again, the electric three-way valve 6 is regulated by the control board 12 to be communicated with the main pipeline 1 to the grouting branch pipe I2, the grouting branch pipe II 3 is closed, the slurry is continuously injected into the goaf 21, and then the grouting is sequentially and circularly reciprocated until grouting is completed.
The intermittent grouting fire prevention and extinguishing method for the hydraulic supports of the fully mechanized mining face of the mine is characterized in that a digital display rotary viscometer 11 monitors the viscosity of grouting slurry and transmits a viscosity signal to a control board 12, when the viscosity of the grouting slurry is 250 mPa.s-400 mPa.s, the control board 12 controls a pneumatic grouting pump 13 to be closed, grouting is stopped, meanwhile, a stirring pump 10 is controlled to operate at a rotating speed of 1000 r/min-1300 r/min, when the viscosity of the grouting slurry is 40 mPa.s-80 mPa.s, the control board 12 controls the stirring pump 10 to operate at a rotating speed of 80 r/min-120 r/min, and meanwhile, the pneumatic grouting pump 13 is started.
Compared with the prior art, the intermittent grouting fire prevention and extinguishing system and method for the hydraulic supports of the fully-mechanized mining face of the mine have the advantages that grouting pipe networks are paved in the goaf at a certain inclination angle in the gap of the hydraulic supports of the fully-mechanized mining face, viscosity of grouting slurry is monitored in real time and is enabled to be not more than 250 mPa.s-400 mPa.s all the time, viscosity increase caused by reduction of shearing force in the grouting process is avoided, a pipeline is slowly flowed, grouting is carried out in the goaf in an intermittent alternating grouting mode, enough time gelation of the grouting slurry injected into the goaf is guaranteed, the thixotropic slurry is accumulated from a bottom plate to a high position in the goaf along the direction of inclination of the working face, air leakage of the goaf is prevented from the working face, and spontaneous combustion of coal in the goaf is prevented.
Drawings
FIG. 1 is a schematic plan view of an intermittent grouting fire preventing and extinguishing system between hydraulic supports of a fully mechanized mining face of a mine;
FIG. 2 is a cross-sectional view of an intermittent grouting fire preventing and extinguishing system between hydraulic supports of a fully mechanized mining face of a mine at E-E;
in the figure: 1-main pipelines, 2-grouting branch pipes, 3-grouting branch pipes, 4-grouting branch pipes, 5-grouting branch pipes, 6-electric three-way valves, 7-rigid pipes, 8-quantitative addition pumps, 9-pulping tanks, 10-stirring pumps, 11-digital display rotary viscometers, 12-control boards, 13-pneumatic grouting pumps, 14-control valves, 15-pressure gauges, 16-flow meters, 17-pressure equalizers, 18-pressure equalizers, 19-pressure regulating valves, 20-return air roadways, 21-goaf, 22-comprehensive mining working faces and 23-hydraulic supports.
Detailed Description
Embodiments of the present invention are further described below with reference to the accompanying drawings:
example 1
Intermittent grouting fire prevention and extinguishing system between hydraulic supports of fully mechanized mining face of mine includes:
(1) The system consists of a main pipeline 1, a first grouting branch pipe 2, a second grouting branch pipe 3, a first grouting branch pipe network 4, a second grouting branch pipe network 5, an electric three-way valve 6, a steel pipe 7, a quantitative adding pump 8, a pulping tank 9, a stirring pump 10, a digital display rotary viscometer 11, a control board 12, a pneumatic grouting pump 13, a control valve 14, a pressure gauge 15, a flowmeter 16, a pressure equalizer 17, a pressure equalizer 18 and a pressure regulating valve 19;
(2) According to the invention, holes are drilled into a goaf 21 at a certain inclination angle in a gap of a hydraulic support 23 of a fully mechanized mining face 22, a grouting branch pipe network I4 and a grouting branch pipe network II 5 are sequentially staggered, the holes between the hydraulic support 23 are buried into the goaf 21, a main pipeline 1 is arranged in an air return roadway 20, a pressure gauge 15, a flow meter 16 and a control valve 14 are arranged on the main pipeline 1, a pneumatic grouting pump 13 is connected to an inlet of the main pipeline 1, a pressure regulating valve 1 is arranged on the pneumatic grouting pump 13, a grouting pool 9 is connected, a quantitative adding pump 8 is arranged on the left side of the grouting pool 9, a stirring pump 10 is arranged right above the grouting pool 9, a digital display rotary viscometer 11 and a control board 12 are arranged on the stirring pump 10, the control board 12 is connected with the pneumatic grouting pump 13, the digital display rotary viscometer 11 and an electric three-way valve 6, a grouting branch pipe 2 and a grouting branch pipe II 3 are connected to an outlet of the main pipeline 1 of the fully mechanized mining face 22, the grouting branch pipe 2 and the grouting branch pipe II 3 are connected with a pressure equalizing pipe network I5, a grouting pipe network II is connected with a grouting pipe network II 5 along the grouting branch pipe network I4, and a grouting pipe network II is connected with a pressure equalizing pipe network II 5, and a grouting pipe network II is connected with a pressure equalizing pipe II 18.
The lengths L=H/sin alpha of the grouting branch pipe network I4 and the grouting branch pipe network II 5 paved in the goaf 21, wherein H is the height of the goaf caving zone, and alpha is the included angle between the drilling hole and the hydraulic support bottom plate on the fully-mechanized mining face. The pressure equalizer I17 is used for realizing the pressure equality of each grouting branch pipe of the grouting branch pipe network I4, the pressure equalizer II 18 is used for realizing the pressure equality of each grouting branch pipe of the grouting branch pipe network II 5, and 3 hydraulic supports are arranged between each grouting branch pipe. The length of the steel flower pipe connected with the first grouting branch pipe network and the two tail ends of the grouting branch pipe network is 5m, the horizontal distance between the tail end of the steel flower pipe and the hydraulic support is 20m, and the tail end of the steel flower pipe is airtight. The main pipeline 1, the grouting branch pipe I2 and the grouting branch pipe II 3 are high-pressure rubber pipes, and the grouting branch pipe network I4 and the grouting branch pipe network II 5 are seamless steel pipes.
The fire prevention and extinguishing method implemented based on the intermittent grouting fire prevention and extinguishing system between the hydraulic supports of the fully mechanized mining face of the mine comprises the following steps:
(1) The thixotropic gel material was mixed with water by the metering pump 8 according to 1:4, putting the mixture into a pulping tank 9, and stirring the mixture by a stirring pump 10 to prepare a slurry;
(2) When the viscosity of the slurry is 60 mPa.s-80 mPa.s, a control valve 14 on a main pipeline 1 is opened, an electric three-way valve 6 is regulated by a control board 12 to be communicated with the main pipeline 1 to a grouting branch pipe I2, the grouting branch pipe II 3 is closed, a pneumatic grouting pump 13 is started to inject the slurry into a goaf 21 through a grouting branch pipe I4, grouting is started for 20min, then the electric three-way valve 6 is regulated by the control board 12 to be communicated with the main pipeline 1 to a grouting branch pipe II 3, the grouting branch pipe I2 is closed, the pneumatic grouting pump 13 continuously injects the slurry into the goaf 21 through the grouting branch pipe I5, grouting is carried out for 20min again, the control board 12 regulates the electric three-way valve 6 to be communicated with the main pipeline 1 to the grouting branch pipe I2, the grouting branch pipe II 3 is closed, the slurry is continuously injected into the goaf 21, and then the grouting is sequentially and circularly repeated until grouting is completed.
The digital display rotary viscometer 11 monitors the viscosity of the grouting slurry and transmits a viscosity signal to the control board 12, when the viscosity of the grouting slurry is 250 mPas-300 mPas, the control board 12 controls the pneumatic grouting pump 13 to be closed, grouting is stopped, meanwhile, the stirring pump 10 is controlled to operate at a rotation speed of 1300r/min, and when the viscosity of the grouting slurry is 60 mPas-80 mPas, the control board 12 controls the stirring pump 10 to operate at a rotation speed of 120r/min, and meanwhile, the pneumatic grouting pump 13 is started to start grouting. The pneumatic grouting pump 13 adjusts the grouting pressure thereof through a pressure regulating valve 19.
Example 2
Intermittent grouting fire prevention and extinguishing system between hydraulic supports of fully mechanized mining face of mine includes:
(1) The system consists of a main pipeline 1, a first grouting branch pipe 2, a second grouting branch pipe 3, a first grouting branch pipe network 4, a second grouting branch pipe network 5, an electric three-way valve 6, a steel pipe 7, a quantitative adding pump 8, a pulping tank 9, a stirring pump 10, a digital display rotary viscometer 11, a control board 12, a pneumatic grouting pump 13, a control valve 14, a pressure gauge 15, a flowmeter 16, a pressure equalizer 17, a pressure equalizer 18 and a pressure regulating valve 19;
(2) According to the invention, holes are drilled into a goaf 21 at a certain inclination angle in a gap of a hydraulic support 23 of a fully mechanized mining face 22, a grouting branch pipe network I4 and a grouting branch pipe network II 5 are sequentially staggered, the holes between the hydraulic support 23 are buried into the goaf 21, a main pipeline 1 is arranged in an air return roadway 20, a pressure gauge 15, a flow meter 16 and a control valve 14 are arranged on the main pipeline 1, a pneumatic grouting pump 13 is connected to an inlet of the main pipeline 1, a pressure regulating valve 1 is arranged on the pneumatic grouting pump 13, a grouting pool 9 is connected, a quantitative adding pump 8 is arranged on the left side of the grouting pool 9, a stirring pump 10 is arranged right above the grouting pool 9, a digital display rotary viscometer 11 and a control board 12 are arranged on the stirring pump 10, the control board 12 is connected with the pneumatic grouting pump 13, the digital display rotary viscometer 11 and an electric three-way valve 6, a grouting branch pipe 2 and a grouting branch pipe II 3 are connected to an outlet of the main pipeline 1 of the fully mechanized mining face 22, the grouting branch pipe 2 and the grouting branch pipe II 3 are connected with a pressure equalizing pipe network I5, a grouting pipe network II is connected with a grouting pipe network II 5 along the grouting branch pipe network I4, and a grouting pipe network II is connected with a pressure equalizing pipe network II 5, and a grouting pipe network II is connected with a pressure equalizing pipe II 18.
The lengths L=H/sin alpha of the grouting branch pipe network I4 and the grouting branch pipe network II 5 paved in the goaf 21, wherein H is the height of the goaf caving zone, and alpha is the included angle between the drilling hole and the hydraulic support bottom plate on the fully-mechanized mining face. The pressure equalizer I17 is used for realizing the pressure equality of each grouting branch pipe of the grouting branch pipe network I4, the pressure equalizer II 18 is used for realizing the pressure equality of each grouting branch pipe of the grouting branch pipe network II 5, and 2 hydraulic supports are arranged between each grouting branch pipe. The length of the steel flower pipe connected with the first grouting branch pipe network and the two tail ends of the grouting branch pipe network is 4m, the horizontal distance between the tail end of the steel flower pipe and the hydraulic support is 15m, and the tail end of the steel flower pipe is airtight. The main pipeline 1, the grouting branch pipe I2 and the grouting branch pipe II 3 are high-pressure rubber pipes, and the grouting branch pipe network I4 and the grouting branch pipe network II 5 are seamless steel pipes.
The fire prevention and extinguishing method implemented based on the intermittent grouting fire prevention and extinguishing system between the hydraulic supports of the fully mechanized mining face of the mine comprises the following steps:
(1) The thixotropic gel material was mixed with water by the metering pump 8 according to 1:5, putting the mixture into a pulping tank 9, and stirring the mixture by a stirring pump 10 to prepare a slurry;
(2) When the viscosity of the slurry is 50 mPa.s-70 mPa.s, a control valve 14 on a main pipeline 1 is opened, an electric three-way valve 6 is regulated by a control board 12 to be communicated with the main pipeline 1 to a grouting branch pipe I2, the grouting branch pipe II 3 is closed, a pneumatic grouting pump 13 is started to inject the slurry into a goaf 21 through a grouting branch pipe network I4, grouting is started for 25min, then the electric three-way valve 6 is regulated by the control board 12 to be communicated with the main pipeline 1 to a grouting branch pipe II 3, the grouting branch pipe I2 is closed, the pneumatic grouting pump 13 continuously injects the slurry into the goaf 21 through a grouting branch pipe network II 5, grouting is performed for 25min again, the control board 12 regulates the electric three-way valve 6 to be communicated with the main pipeline 1 to the grouting branch pipe I2, the grouting branch pipe II 3 is continuously injected into the goaf 21, and then the pneumatic grouting pump 13 is sequentially and circularly reciprocated until grouting is completed.
The digital display rotary viscometer 11 monitors the viscosity of the grouting slurry and transmits a viscosity signal to the control board 12, when the viscosity of the grouting slurry is 300 mPas-350 mPas, the control board 12 controls the pneumatic grouting pump 13 to be closed, grouting is stopped, meanwhile, the stirring pump 10 is controlled to operate at the speed of 1100r/min, and when the viscosity of the grouting slurry is 50 mPas-70 mPas, the control board 12 controls the stirring pump 10 to operate at the speed of 100r/min, and meanwhile, the pneumatic grouting pump 13 is started to start grouting. The pneumatic grouting pump 13 adjusts the grouting pressure thereof through a pressure regulating valve 19.
Example 3
Intermittent grouting fire prevention and extinguishing system between hydraulic support frames of fully mechanized mining face of mine includes:
(1) The system consists of a main pipeline 1, a first grouting branch pipe 2, a second grouting branch pipe 3, a first grouting branch pipe network 4, a second grouting branch pipe network 5, an electric three-way valve 6, a steel pipe 7, a quantitative adding pump 8, a pulping tank 9, a stirring pump 10, a digital display rotary viscometer 11, a control board 12, a pneumatic grouting pump 13, a control valve 14, a pressure gauge 15, a flowmeter 16, a pressure equalizer 17, a pressure equalizer 18 and a pressure regulating valve 19;
(2) According to the invention, holes are drilled into a goaf 21 at a certain inclination angle in a gap of a hydraulic support 23 of a fully mechanized mining face 22, a grouting branch pipe network I4 and a grouting branch pipe network II 5 are sequentially staggered, the holes between the hydraulic support 23 are buried into the goaf 21, a main pipeline 1 is arranged in an air return roadway 20, a pressure gauge 15, a flow meter 16 and a control valve 14 are arranged on the main pipeline 1, a pneumatic grouting pump 13 is connected to an inlet of the main pipeline 1, a pressure regulating valve 1 is arranged on the pneumatic grouting pump 13, a grouting pool 9 is connected, a quantitative adding pump 8 is arranged on the left side of the grouting pool 9, a stirring pump 10 is arranged right above the grouting pool 9, a digital display rotary viscometer 11 and a control board 12 are arranged on the stirring pump 10, the control board 12 is connected with the pneumatic grouting pump 13, the digital display rotary viscometer 11 and an electric three-way valve 6, a grouting branch pipe 2 and a grouting branch pipe II 3 are connected to an outlet of the main pipeline 1 of the fully mechanized mining face 22, the grouting branch pipe 2 and the grouting branch pipe II 3 are connected with a pressure equalizing pipe network I5, a grouting pipe network II is connected with a grouting pipe network II 5 along the grouting branch pipe network I4, and a grouting pipe network II is connected with a pressure equalizing pipe network II 5, and a grouting pipe network II is connected with a pressure equalizing pipe II 18.
The lengths L=H/sin alpha of the grouting branch pipe network I4 and the grouting branch pipe network II 5 paved in the goaf 21, wherein H is the height of the goaf caving zone, and alpha is the included angle between the drilling hole and the hydraulic support bottom plate on the fully-mechanized mining face. The pressure equalizer I17 is used for realizing the pressure equality of grouting branch pipes of the grouting branch pipe network I4, the pressure equalizer II 18 is used for realizing the pressure equality of grouting branch pipes of the grouting branch pipe network II 5, and 1 hydraulic support is arranged between each grouting branch pipe. The length of the steel flower pipe connected with the first grouting branch pipe network and the two tail ends of the grouting branch pipe network is 3m, the horizontal distance between the tail end of the steel flower pipe and the hydraulic support is 10m, and the tail end of the steel flower pipe is airtight. The main pipeline 1, the grouting branch pipe I2 and the grouting branch pipe II 3 are high-pressure rubber pipes, and the grouting branch pipe network I4 and the grouting branch pipe network II 5 are seamless steel pipes.
The fire prevention and extinguishing method implemented based on the intermittent grouting fire prevention and extinguishing system between the hydraulic support frames of the fully mechanized mining face of the mine comprises the following steps:
(1) The thixotropic gel material was mixed with water by the metering pump 8 according to 1:6, putting the mixture into a pulping tank 9 in proportion, and stirring the mixture by a stirring pump 10 to prepare a slurry;
(2) When the viscosity of the slurry is 40 mPa.s-60 mPa.s, a control valve 14 on a main pipeline 1 is opened, an electric three-way valve 6 is regulated by a control board 12 to be communicated with the main pipeline 1 to a grouting branch pipe I2, the grouting branch pipe II 3 is closed, a pneumatic grouting pump 13 is started to inject the slurry into a goaf 21 through a grouting branch pipe I4, grouting is started for 30min, then the electric three-way valve 6 is regulated by the control board 12 to be communicated with the main pipeline 1 to the grouting branch pipe II 3, the grouting branch pipe I2 is closed, the pneumatic grouting pump 13 continuously injects the slurry into the goaf 21 through the grouting branch pipe I5, grouting is carried out for 30min again, the electric three-way valve 6 is regulated by the control board 12 to be communicated with the main pipeline 1 to the grouting branch pipe I2, the grouting branch pipe II 3 is closed, the slurry is continuously injected into the goaf 21, and then the pneumatic grouting pump 13 is sequentially circulated and reciprocally until grouting is completed.
The digital display rotary viscometer 11 monitors the viscosity of the grouting slurry and transmits a viscosity signal to the control board 12, when the viscosity of the grouting slurry is 350 mPas-400 mPas, the control board 12 controls the pneumatic grouting pump 13 to be closed, grouting is stopped, meanwhile, the stirring pump 10 is controlled to operate at a rotating speed of 1000r/min, and when the viscosity of the grouting slurry is 40 mPas-60 mPas, the control board 12 controls the stirring pump 10 to operate at a rotating speed of 80r/min, and meanwhile, the pneumatic grouting pump 13 is started to start grouting. The pneumatic grouting pump 13 adjusts the grouting pressure thereof through a pressure regulating valve 19.
Claims (2)
1. The intermittent grouting fire prevention and extinguishing method comprises an intermittent grouting fire prevention and extinguishing system among hydraulic supports of a fully-mechanized mining face of a mine, wherein the intermittent grouting fire prevention and extinguishing system among the hydraulic supports of the fully-mechanized mining face of the mine consists of a main pipeline (1), a grouting branch pipe I (2), a grouting branch pipe II (3), a grouting branch pipe network I (4), a grouting branch pipe network II (5), an electric three-way valve (6), a steel pipe (7), a quantitative adding pump (8), a pulping tank (9), a stirring pump (10), a digital display rotary viscometer (11), a control board (12), a pneumatic grouting pump (13), a control valve (14), a pressure gauge (15), a flowmeter (16), a pressure equalizer I (17), a pressure equalizer II (18), a pressure regulating valve (19), a return airway (20), a goaf (21), a fully-mechanized mining face (22) and a hydraulic support (23); the main pipeline (1) is arranged in a return air lane (20), a pressure gauge (15), a flow meter (16) and a control valve (14) are arranged on the main pipeline (1), a pneumatic grouting pump (13) is connected to the inlet of the main pipeline (1), a pressure regulating valve (19) is arranged on the pneumatic grouting pump (13), a grouting pool (9) is connected, a quantitative adding pump (8) is arranged on the left side of the grouting pool (9), a stirring pump (10) is arranged right above the pneumatic grouting pump, a digital display rotary viscometer (11) and a control board (12) are arranged on the stirring pump (10), the control board (12) is connected with the pneumatic grouting pump (13), the digital display rotary viscometer (11), the stirring pump (10) and an electric three-way valve (6), a grouting branch pipe (2) and a grouting branch pipe (3) are connected to the outlet of the main pipeline (1) of a fully-mechanized mining working face (22), the grouting branch pipe (2) and the grouting branch pipe (3) tend to be paved along the working face (22), a first branch pipe (2) is provided with a digital display rotary viscometer (11) and a control board (12), a second branch pipe (17) is connected with a pressure equalizing pipe (4) and a second pipe (4) is connected with a pressure equalizing pipe (4), the end of the grouting branch pipe network II (5) is connected with a steel pipe (7), holes are drilled into the goaf (21) at a certain inclination angle in the gap of the hydraulic support (23) of the fully mechanized mining face (22), the grouting branch pipe network I (4) and the grouting branch pipe network II (5) are sequentially staggered, and the holes between the frames of the hydraulic support (23) are buried into the goaf (21); the grouting fire prevention and extinguishing method is characterized by comprising the following steps of:
a metering pump (8) mixes thixotropic gel material with water according to a ratio of 1:4 or 1:5 or 1:6, putting the mixture into a pulping tank (9), and stirring the mixture by a stirring pump (10) to prepare a slurry;
secondly, measuring the viscosity of the slurry in real time by using a digital display rotary viscometer (11), when the viscosity of the slurry is 40 mPa.s-80 mPa.s, opening a control valve (14) on a main pipeline (1), regulating an electric three-way valve (6) to be communicated with the main pipeline (1) to a grouting branch pipe I (2) by a control board (12), closing the grouting branch pipe II (3), starting a pneumatic grouting pump (13) to inject the slurry into a goaf (21) through the grouting branch pipe I (4), beginning grouting for 20-30 min, regulating the electric three-way valve (6) to be communicated with the main pipeline (1) to the grouting branch pipe II (3) by the control board (12), closing the grouting branch pipe I (2), continuously injecting the slurry into the goaf (21) through the grouting branch pipe II (5) by the pneumatic grouting pump (13),
grouting is carried out again for 20-30 min, the control board (12) adjusts the electric three-way valve (6) to be communicated with the main pipeline (1) to the grouting branch pipe I (2), the grouting branch pipe II (3) is closed, the grouting is continuously injected into the goaf (21), and then the grouting is sequentially and circularly carried out until the grouting is completed.
2. The intermittent grouting fire prevention and extinguishing method between hydraulic supports of a fully mechanized mining face of a mine according to claim 1, wherein a digital display rotary viscometer (11) monitors the viscosity of grouting slurry and transmits a viscosity signal to a control board (12), when the viscosity of the grouting slurry is 250-400 mPa.s, the control board (12) controls a pneumatic grouting pump (13) to be closed, grouting is stopped, meanwhile, a stirring pump (10) is controlled to operate at a rotating speed of 1000-1300 r/min, when the viscosity of the grouting slurry is 40-80 mPa.s, the control board (12) controls the stirring pump (10) to operate at a rotating speed of 80-120 r/min, and meanwhile, the pneumatic grouting pump (13) is started.
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