CN210834789U - Monitoring structure for spontaneous combustion dangerous area in goaf - Google Patents
Monitoring structure for spontaneous combustion dangerous area in goaf Download PDFInfo
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- CN210834789U CN210834789U CN201921484789.7U CN201921484789U CN210834789U CN 210834789 U CN210834789 U CN 210834789U CN 201921484789 U CN201921484789 U CN 201921484789U CN 210834789 U CN210834789 U CN 210834789U
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Abstract
The utility model discloses a monitoring structure for spontaneous combustion dangerous area in goaf, which comprises a sampling protection tube arranged along one side of a crossheading close to a coal side, wherein M air inlet side monitoring ports are arranged on a pipe section of the air inlet side sampling protection tube, which is far away from an outlet of the crossheading on an air inlet side, along the length direction of the pipe section, N air return side monitoring ports are arranged on a pipe section of the air return side sampling protection tube, which is far away from an outlet of the crossheading on an air return side, along the length direction of the pipe section, and M is smaller than N; an explosion-proof air pump is arranged on a pipe section of the sampling protection pipe, which is close to the crossheading outlet, the output end of the explosion-proof air pump is connected with a gas chromatograph and an SF6 tracer gas tester, an SF6 tracer gas release device is arranged on the pipe section of the air inlet side sampling protection pipe, which is close to the coal face, in the depth direction of the goaf, and the monitoring port is connected with the explosion-proof air pump through a beam pipe. The utility model discloses utilize oxygen distribution in the gas chromatograph monitoring collecting space area, SF6 tracer gas apparatus survey SF6 tracer gas distributes, the two gas monitoring collecting space area condition of leaking out, the degree of accuracy is high.
Description
Technical Field
The utility model belongs to the technical field of collecting space area air leakage monitoring, concretely relates to collecting space area spontaneous combustion danger area monitoring structure.
Background
Spontaneous combustion fire of a mine coal bed becomes one of main disasters directly threatening the safety production of the mine. According to statistics, about 80% of the mined coal seams in China have coal spontaneous combustion tendency; especially in recent years, the comprehensive top coal caving mining technology in China is greatly popularized, the coal production efficiency and the coal yield are greatly improved, meanwhile, a large amount of float coal is left in a goaf, coal spontaneous combustion fire disasters frequently occur in more and more mines, especially in high gas mines, in order to reduce the gas content in the mines, the air distribution quantity is increased to an air inlet tunnel to be large, the goaf air leakage condition is very serious, and under the condition of sufficient oxygen, the residual coal is easy to have oxidation reaction with oxygen, the spontaneous combustion fire disasters in the goaf are caused, and the life safety of miners and the safety production of coal mines are seriously threatened. The spontaneous combustion characteristic of the fully mechanized caving face gob: the coal spontaneous combustion phenomenon generally occurs in a deep part with a certain distance from a working surface, and a high-temperature area of a fire source is quite hidden and has a large range; the goaf is open in air leakage, large in three-dimensional space, long in working face, more concealed in fire source and difficult to find. The spontaneous combustion area of the goaf has great ambiguity on the determination of the fire source position, so that the blindness of fire area treatment is increased, the treatment area is enlarged, and resources are wasted.
According to the coal-oxygen composite theory of coal spontaneous combustion and practical production experience, the coal spontaneous combustion must have four conditions: firstly, the coal with natural tendency is in a broken state after being mined, and the stacking thickness is generally more than 0.4 m; secondly, the heat storage environment is good; thirdly, continuous oxygen supply is carried out; fourthly, a sufficiently long time; therefore, in the coal mining process, the recovery rate is improved as much as possible, the residual coal in the goaf is reduced, the concentration of oxygen in the goaf must be controlled, goaf air leakage is the largest threat factor of oxygen increase in the goaf, and the high efficiency, high accuracy and high dimensional measurement and identification of the goaf air leakage condition are lacked in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that lie in to above-mentioned prior art not enough, a collecting space area spontaneous combustion danger area monitoring structure is provided, its novel in design is reasonable, set up M air inlet side monitoring mouth and a SF6 tracer gas release on the air inlet side sampling protection tube in the air inlet side crossheading, set up N air return side monitoring mouth on the air return side sampling protection tube in the air return side crossheading, utilize gas chromatograph to monitor oxygen distribution in the collecting space area, utilize SF6 tracer gas apparatus survey SF6 tracer gas to distribute, the two gas monitoring collecting space area air leakage circumstances, and then detect collecting space area spontaneous combustion danger area, the degree of accuracy is high, convenient to popularize and use.
In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a collecting space area spontaneous combustion danger area monitoring structure which characterized in that: the coal wall surface monitoring device comprises an air inlet side sampling protection tube and a return air side sampling protection tube, wherein the air inlet side sampling protection tube is arranged along one side, close to a coal wall, of an air inlet side crossheading, the return air side sampling protection tube is arranged along one side, close to the coal wall, of the return air side crossheading; an air inlet side explosion-proof air pump is arranged on a pipe section of the air inlet side sampling protection pipe close to an air inlet side crossheading outlet, the output end of the air inlet side explosion-proof air pump is connected with an air inlet side gas chromatograph and an air inlet side SF6 tracer gas determinator, a return air side explosion-proof air pump is arranged on a pipe section of the return air side sampling protection pipe close to a return air side crossheading outlet, the output end of the return air side explosion-proof air pump is connected with a return air side gas chromatograph and a return air side SF6 tracer gas determinator, an SF6 tracer gas release device is arranged on the pipe section of the air inlet side sampling protection pipe which is positioned in a goaf and close to a coal face and in the depth direction of the goaf, each air inlet side monitoring port is connected with the air inlet end of the air inlet side explosion-proof air pump through an independent first bundle pipe, the first bundle pipe is positioned in the air inlet side sampling protection pipe, each return air side monitoring port is connected with the air inlet end of, the second beam of tubes is positioned in the sampling protection tube at the air return side.
The monitoring structure for the spontaneous combustion dangerous area of the goaf is characterized in that: the distance between two adjacent air inlet side monitoring ports is 45-60 m; the distance between two adjacent air return side monitoring ports is 25-35 m; the quantity of first beam pipe is equal and the one-to-one with the quantity of air inlet side monitoring mouth, the quantity of second beam pipe is equal and the one-to-one with the quantity of return air side monitoring mouth.
The monitoring structure for the spontaneous combustion dangerous area of the goaf is characterized in that: the length that air inlet side sampling protection tube and return air side sampling protection tube stretched into to the collecting space area is not less than 150 m.
The monitoring structure for the spontaneous combustion dangerous area of the goaf is characterized in that: and the air inlet side monitoring port and the air return side monitoring port are arranged towards the inner side of the goaf.
The monitoring structure for the spontaneous combustion dangerous area of the goaf is characterized in that: and the air inlet side sampling protection pipe and the air return side sampling protection pipe are both steel pipes.
The monitoring structure for the spontaneous combustion dangerous area of the goaf is characterized in that: and the distance between the release end of the SF6 tracer gas release device and one end of the goaf close to the coal face is 9-11 m.
Compared with the prior art, the utility model has the following advantage:
1. the utility model arranges the air inlet side sampling protection tube along the length direction of the air inlet side crossheading, arranges M air inlet side monitoring ports along the length direction on the pipe section of the air inlet side sampling protection tube far away from the air inlet side crossheading outlet, arranges N air return side monitoring ports along the length direction on the pipe section of the air return side sampling protection tube far away from the return air side crossheading outlet, and longitudinally deepens the air leakage condition of different depth positions of the goaf from both sides by arranging the air return side sampling protection tube along the return air side crossheading length direction, because the coal mining machine has better coal mining effect on the goaf at the middle position of the goaf, the probability of remaining float coal with the thickness more than 0.4M at the middle position of the goaf is smaller, thereby avoiding arranging the monitoring ports in the width direction of the goaf, thereby greatly reducing the arrangement quantity of the monitoring ports, meanwhile, the air leakage detection effect in the depth direction of the goaf is improved, and further, the spontaneous combustion dangerous area of the goaf is detected, so that the goaf spontaneous combustion detection method is convenient to popularize and use.
2. The utility model discloses the quantity of laying of air-supply side monitoring port is less than the quantity of laying of return air side monitoring port, M and N are positive integer and M is less than N promptly, because the wind current flows to return air side crossheading through the air-supply side crossheading, the wind speed of wind current can weaken, the wind speed that the wind current was located at air-supply side crossheading and coal face intersection position is greater than the wind speed of wind current at return air side crossheading and coal face intersection position, it takes away the wind speed that air-supply side crossheading and coal face intersection position department heat are greater than taking away return air side crossheading and coal face intersection position department heat to result in the wind current, return air side crossheading heat accumulation, the probability that the float coal took place nature in return air side crossheading side gob is greater than the probability that the float coal takes place nature in air-supply side crossheading side gob, therefore, the density of return air side monitoring port that return air side sampling protection tube piece set up on keeping away from the pipeline section of return air side crossheading export and along its length direction is more than the pipeline section of air-supply air side sampling protection piece export and the density of the air inlet side monitoring port arranged in the length direction is large, and the monitoring effect is good.
3. The utility model discloses be located the collecting space area and be close to on the pipeline section of coal face the air inlet side sampling protection tube and install SF6 tracer gas release on the direction of depth in collecting space area, utilize gas chromatograph to monitor oxygen distribution in the collecting space area and utilize SF6 tracer gas apparatus survey SF6 tracer gas distribution simultaneously, because the increase of oxygen concentration in the collecting space area is not necessarily because collecting space area air leakage leads to, but SF6 tracer gas's diffusion is certainly because collecting space area air leakage leads to, therefore, monitoring SF6 tracer gas diffusion scope can effectively survey the air leakage degree of collecting space area, whether simultaneously for whether collecting space area air leakage leads to collecting space area oxygen concentration increase provides reliable foundation, the timely reason of staff of being convenient for pinpoints, the investigation is lacked, avoid the emergence of accident.
To sum up, the utility model relates to a novel reasonable sets up M air inlet side monitoring mouth and a SF6 tracer gas release on the air inlet side sampling protection tube in the air inlet side crossheading, set up N return air side monitoring mouth on the return air side sampling protection tube in the return air side crossheading, utilize gas chromatograph to monitor oxygen distribution in the collecting space area, utilize SF6 tracer gas apparatus survey SF6 tracer gas distribution, the two gas monitoring collecting space area condition of leaking out, and then detect collecting space area spontaneous combustion danger area, the degree of accuracy is high, convenient to popularize and use.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of the device of the present invention.
Fig. 2 is a partially enlarged view of a portion a in fig. 1.
Fig. 3 is a partially enlarged view of fig. 1 at B.
Fig. 4 is the position relation schematic diagram of the SF6 trace gas releasing device gas outlet end and the monitoring port of the utility model.
Description of reference numerals:
1-coal face; 2-air inlet side crossheading; 3, air return side crossheading;
4-air inlet side sampling protection tube; 5, a sampling protection tube at the air return side; 6-a goaf;
7-SF 6 tracer gas release means; 8-an air inlet side monitoring port;
9-air return side monitoring port; 10-explosion-proof air pump at the air return side;
11-explosion-proof air pump at the air inlet side; 12-return air side gas chromatograph;
13-return side SF6 tracer gas tester; 14-air inlet side gas chromatograph;
15-air inlet side SF6 tracer gas tester.
Detailed Description
As shown in fig. 1 to 3, a collecting space area spontaneous combustion danger area monitoring structure, include along the intake side crossheading 2 be close to the air inlet side sampling protection tube 4 that one side of coal group laid and along the return side crossheading 3 be close to the return air side sampling protection tube 5 that one side of coal group laid, intake side sampling protection tube 4 is kept away from on the pipeline section of intake side crossheading 2 export and is provided with M intake side monitoring ports 8 along its length direction, return air side sampling protection tube 5 is kept away from on the pipeline section of return air side crossheading 3 export and is provided with N return air side monitoring ports 9 along its length direction, wherein, M and N are positive integer and M is less than N; an air inlet side explosion-proof air pump 11 is arranged on a pipe section of an air inlet side sampling protection pipe 4 close to an outlet of an air inlet side crossheading 2, an output end of the air inlet side explosion-proof air pump 11 is connected with an air inlet side gas chromatograph 14 and an air inlet side SF6 tracer gas determinator 15, an air return side explosion-proof air pump 10 is arranged on a pipe section of an air return side sampling protection pipe 5 close to an outlet of an air return side crossheading 3, an output end of the air return side explosion-proof air pump 10 is connected with an air return side gas chromatograph 12 and an air return side SF6 tracer gas determinator 13, an SF6 tracer gas release device 7 is arranged on the pipe section of the air inlet side sampling protection pipe 4 which is positioned in a goaf 6 and close to a coal mining working face 1 in the depth direction towards the goaf 6, each air inlet side monitoring port 8 is respectively connected with an air inlet end of the air inlet side explosion-proof air pump 11 through an independent, each air return side monitoring port 9 is connected with the air inlet end of an air return side explosion-proof air pump 10 through an independent second beam pipe, and the second beam pipe is located in the air return side sampling protection pipe 5.
It should be noted that, by arranging the air inlet side sampling protection tube 4 along the length direction of the air inlet side crossheading, arranging M air inlet side monitoring ports 8 along the length direction on the pipe section of the air inlet side sampling protection tube 4 far away from the outlet of the air inlet side crossheading 2, by arranging the air return side sampling protection tube 5 along the length direction of the air return side crossheading, arranging N air return side monitoring ports 9 along the length direction on the pipe section of the air return side sampling protection tube 5 far away from the outlet of the air return side crossheading 3, M air inlet side monitoring ports 8 and N air return side monitoring ports 9 longitudinally penetrate from both sides to monitor the air leakage condition at different depth positions of the goaf 6, because the coal mining machine has better coal mining effect on the middle position of the goaf 6, the probability that the floating coal with the thickness larger than 0.4M remains at the middle position of the goaf 6 is smaller, the adoption of arranging the monitoring ports in the width direction of the goaf 6, therefore, the arrangement number of monitoring ports is greatly reduced, and the air leakage detection effect in the depth direction of the goaf 6 is improved; the arrangement number of the air inlet side monitoring ports 8 is less than that of the air return side monitoring ports 9, namely M and N are positive integers and M is less than N, as the air flows through the air inlet side crossheading 2 to flow to the air return side crossheading 3, the air speed of the air flow is weakened, namely the air speed of the air flow at the intersection position of the air inlet side crossheading 2 and the coal face 1 is greater than that of the air flow at the intersection position of the air return side crossheading 3 and the coal face 1, so that the heat at the intersection position of the air inlet side crossheading 2 and the coal face 1 taken away by the air flow is greater than that of the intersection position of the air flow 3 and the coal face 1 taken away by the air flow, the heat in the air return side crossheading 3 is accumulated, the natural probability of the floating coal in the goaf 6 at the air return side crossheading 3 side is greater than that of the floating coal in the goaf 6 at the air inlet side crossheading 2, and therefore, the density of the air return side sampling protection pipe 5 far away from the outlet of the air return side crossheading 3 and arranged along the length direction The density of the air inlet side monitoring ports 8 arranged on the pipe section at the outlet of the air inlet side crossheading 2 along the length direction is high, and the monitoring effect is good; install SF6 tracer gas release 7 on the degree of depth direction towards collecting space 6 on the section that is located collecting space 6 and is close to coal face 1 at air inlet side sampling protection tube 4, utilize gas chromatograph monitoring collecting space in oxygen distribution utilize SF6 tracer gas apparatus survey SF6 tracer gas to distribute, because the increase of the interior oxygen concentration of collecting space 6 is not necessarily because of collecting space area air leakage leads to, but the diffusion of SF6 tracer gas certainly leads to because collecting space area air leakage, therefore, monitoring SF6 tracer gas diffusion scope can effectively survey the air leakage degree in collecting space 6, whether simultaneously for collecting air leakage leads to the increase of the interior oxygen concentration of collecting space 6 and provides reliable foundation, the staff's timely reason of pinpointing, the investigation is lacked, avoid the emergence of accident.
In this embodiment, the distance between two adjacent air inlet side monitoring ports 8 is 45m to 60 m; the distance between two adjacent air return side monitoring ports 9 is 25-35 m; the number of the first beam pipes is equal to that of the air inlet side monitoring ports 8, and the number of the second beam pipes is equal to that of the air return side monitoring ports 9.
It should be noted that, the distance between two adjacent air inlet side monitoring ports 8 is 45m to 60m, in this embodiment, the preferred distance between two adjacent air inlet side monitoring ports 8 is 50m, and the air inlet side sampling protection tube 4 is arranged on the tube section away from the outlet of the air inlet side gateway 2 and along the length direction thereof with 4 air inlet side monitoring ports 8; the distance between two adjacent air return side monitoring ports 9 is 25 m-35 m, in this embodiment, the distance between two adjacent air return side monitoring ports 9 is preferably 30m, 6 air return side monitoring ports 9 are arranged on a pipe section of the air return side sampling protection pipe 5, which is far away from an outlet of the air return side gateway 3 and along the length direction of the pipe section, 4 air inlet side monitoring ports 8 are respectively connected with an air inlet side explosion-proof air suction pump 11 through 4 first bundle pipes, and 6 air return side monitoring ports 9 are respectively connected with an air return side explosion-proof air suction pump 10 through 6 second bundle pipes; the preferred air inlet side explosion-proof air pump 11 and the air return side explosion-proof air pump 10 both adopt a mining LTKS-09 type beam tube air pump.
In this embodiment, the length of the air inlet side sampling protection tube 4 and the air return side sampling protection tube 5 extending into the goaf 6 is not less than 150 m.
In this embodiment, the air inlet side monitoring port 8 and the air return side monitoring port 9 are both arranged towards the inner side of the gob 6.
In this embodiment, the air inlet side sampling protection tube 4 and the air return side sampling protection tube 5 are both steel tubes.
It should be noted that the air inlet side sampling protection tube 4 and the air return side sampling protection tube 5 are both steel tubes, so that the use strength of the sampling protection tubes is ensured.
In this embodiment, the distance between the release end of the SF6 tracer gas release device 7 and one end of the goaf 6 close to the coal face 1 is 9-11 m.
As shown in fig. 4, the utility model discloses during the use, the intake side sampling protection tube 4 that one side was laid near the coal group in the intake side crossheading 2 of coal face 1 one side, the return air side sampling protection tube 5 that one side was laid near the coal group in the return air side crossheading 3 of coal face 1 opposite side, keep away from on the pipeline section of intake side crossheading 2 export and set up M intake side monitoring ports 8 along its length direction at intake side sampling protection tube 4, keep away from on the pipeline section of return air side crossheading 3 export and set up N return air side monitoring ports 9 along its length direction at return air side sampling protection tube 5, wherein, M and N are positive integer and M is less than N;
an air inlet side explosion-proof air pump 11 is arranged on a pipe section of the air inlet side sampling protection pipe 4 close to an outlet of the air inlet side crossheading 2, and the output end of the air inlet side explosion-proof air pump 11 is connected with an air inlet side gas chromatograph 14 and an air inlet side SF6 tracer gas determinator 15;
a pipe section of the return air side sampling protection pipe 5, which is close to an outlet of the return air side crossheading 3, is provided with a return air side explosion-proof air pump 10, and the output end of the return air side explosion-proof air pump 10 is connected with a return air side gas chromatograph 12 and a return air side SF6 tracer gas determinator 13;
each air inlet side monitoring port 8 is connected with the air inlet end of an air inlet side explosion-proof air pump 11 through an independent first beam pipe, and each air return side monitoring port 9 is connected with the air inlet end of an air return side explosion-proof air pump 10 through an independent second beam pipe;
the coal face 1 is pushed, an air inlet side explosion-proof air pump 11 and an air return side explosion-proof air pump 10 are started, a gas sample collected by each monitoring port is collected, the pushing distance of the coal face 1 every day is recorded, meanwhile, an air inlet side gas chromatograph 14 is used for analyzing the oxygen concentration value in the gas sample collected by each air inlet side monitoring port 8, an air return side gas chromatograph 12 is used for analyzing the oxygen concentration value in the gas sample collected by each air return side monitoring port 9, and the oxygen distribution condition in the goaf is determined; until the advancing distance of the coal face 1 reaches the specified advancing distance;
installing an SF6 tracer gas release device 7 on the air inlet side sampling protection tube 4, and installing an SF6 tracer gas release device 7 on a tube section, which is positioned in the goaf 6 and close to the coal face 1, of the air inlet side sampling protection tube 4, and meanwhile, facing the depth direction of the goaf 6; starting an air inlet side explosion-proof air pump 11 and an air return side explosion-proof air pump 10, collecting the gas sample collected by each monitoring port, analyzing the oxygen concentration value in the gas sample collected by each air inlet side monitoring port 8 by using an air inlet side gas chromatograph 14, and determining the SF6 trace gas concentration value in the gas sample collected by each air inlet side monitoring port 8 by using an air inlet side SF6 trace gas determinator 15; analyzing the oxygen concentration value in the gas sample collected by each air return side monitoring port 9 by using an air return side gas chromatograph 12, measuring the SF6 trace gas concentration value in the gas sample collected by each air return side monitoring port 9 by using an air return side SF6 trace gas measuring instrument 13, and determining the oxygen distribution and SF6 trace gas distribution conditions in the goaf;
the position of the air inlet side monitoring port 8 for collecting SF6 tracer gas shows the diffusion depth of SF6 tracer gas, and further shows the air leakage depth;
taking an air inlet side monitoring port 8 which is arranged on an air inlet side sampling protection tube 4 and is farthest from a coal face 1 as a starting point, numbering M air inlet side monitoring ports 8 in sequence, and numbering according to a formula
Calculating the air leakage speed v of the area between the mth air inlet side monitoring port 8 on the air inlet side and the (m-1) th air inlet side monitoring port 8 on the air inlet sideJ,m,m-1Wherein L isJ,m,m-1Is the distance between the mth air inlet side monitoring port 8 on the air inlet side and the (m-1) th air inlet side monitoring port 8 on the air inlet side, kJ,m,m-1Is LJ,m,m-1K is a correction coefficient ofJ,m,m-1>1，tJ,mThe time interval value, delta t, of the SF6 tracer gas releasing time of the SF6 tracer gas releasing device 7 and the time interval value, delta t, of the SF6 tracer gas concentration value time acquired by the mth air inlet side monitoring port 8 and determined by the air inlet side SF6 tracer gas measuring instrument 15J,mIs tJ,mTime correction value of and Δ tJ,m>0，tJ,m-1The time interval value, delta t, of the SF6 tracer gas release moment of the SF6 tracer gas release device 7 and the time interval value, delta t, of the SF6 tracer gas concentration value moment collected by the m-1 th air inlet side monitoring port 8 measured by the air inlet side SF6 tracer gas measuring instrument 15J,m-1Is tJ,m-1Time correction value of and Δ tJ,m-1>0, wherein M is the number of the air inlet side monitoring port 8 and M is 1,2, …, M; when m is 1, LJ,1,0Is the distance, t, between the output port of the SF6 tracer gas release device 7 and the 1 st air inlet side monitoring port 8 on the air inlet side J,m-10 and Δ tJ,m-1＝0；
The air return side monitoring ports 9 at the farthest ends from the coal face 1 on the air return side sampling protection tube 5 are used as starting points, the N air return side monitoring ports 9 are numbered in sequence, and the numbers are calculated according to a formula
Calculating the air leakage speed v at the nth air return side monitoring port 9 of the air return sideH,nWherein L isH,nFor the distance, k, between the outlet of the SF6 trace gas releasing device 7 and the nth return air side monitoring port 9H,nIs LH,nK is a correction coefficient ofH,n>1，tH,nThe SF6 tracer gas releasing device 7 releases SF6 tracer gas at the moment and the return air side SF6 tracer gas tester 13 measures the time interval value delta t of the concentration value moment of the SF6 tracer gas collected by the nth return air side monitoring port 9H,nIs tH,nTime correction value of and Δ tH,n>0, where N is the number of the return air side monitoring port 9 and N is 1,2, …, N; according to the formula
Calculating the air leakage speed v at the nth air return side monitoring port 9 of the air return sideH,nComponent of velocity in the direction of the crossheading
And the air leakage speed v at the position of the nth air return side monitoring port 9 on the air return sideH,nComponent of velocity in a direction perpendicular to the crossheading
Wherein, βnAnd the connecting line of the output port of the SF6 tracer gas release device 7 and the nth return air side monitoring port 9 on the return air side forms an included angle with the plane of the coal face 1.
In this embodiment, the concentration of oxygen in the gob 6 during spontaneous combustion ignition dangerous air leakage is 5% to 18%.
In this embodiment, the specified advance distance is not less than 150 m.
The position of the air inlet side monitoring port for collecting SF6 tracer gas is utilized to represent the diffusion depth of SF6 tracer gas, the air leakage depth is further represented, the accuracy is high, the air leakage speed is determined, the air leakage speed gradient in the goaf can be divided, and the air leakage speed rule of the goaf is determined, so that the flowing state of air flow in the goaf is accurately known, the movement condition of oxygen in the goaf is determined, and the position of a dangerous area is accurately predicted.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and the equivalent structure change of doing above embodiment the utility model discloses technical scheme's within the scope of protection.
Claims (6)
1. The utility model provides a collecting space area spontaneous combustion danger area monitoring structure which characterized in that: the coal wall sampling protection device comprises an air inlet side sampling protection tube (4) arranged along one side, close to a coal wall, of an air inlet side crossheading (2) and a return air side sampling protection tube (5) arranged along one side, close to the coal wall, of the return air side crossheading (3), wherein M air inlet side monitoring ports (8) are arranged on a pipe section, away from an outlet of the air inlet side crossheading (2), of the air inlet side sampling protection tube (4) and along the length direction of the pipe section, and N return air side monitoring ports (9) are arranged on a pipe section, away from an outlet of the return air side crossheading (3), of the return air side sampling protection tube (5) and along the length direction of; an air inlet side explosion-proof air pump (11) is arranged on a pipe section of an air inlet side sampling protection pipe (4) close to an outlet of an air inlet side crossheading (2), an air inlet side gas chromatograph (14) and an air inlet side SF6 tracer gas determinator (15) are connected to the output end of the air inlet side explosion-proof air pump (11), a return air side explosion-proof air pump (10) is arranged on a pipe section of a return air side sampling protection pipe (5) close to an outlet of a return air side crossheading (3), an SF6 tracer gas determinator (13) is connected to the output end of the return air side explosion-proof air pump (10), an SF6 tracer gas release device (7) is arranged on the pipe section of the air inlet side sampling protection pipe (4) which is positioned in a goaf (6) and close to a coal face (1) in the depth direction towards the goaf (6), and each air inlet side monitoring port (8) is connected with an air inlet end of the air inlet side explosion-proof air pump (11) through an independent first bundle of pipe, the first beam tube is positioned in the air inlet side sampling protection tube (4), each air return side monitoring port (9) is connected with the air inlet end of an air return side explosion-proof air pump (10) through an independent second beam tube, and the second beam tube is positioned in the air return side sampling protection tube (5).
2. The gob auto-ignition danger area monitoring structure according to claim 1, wherein: the distance between two adjacent air inlet side monitoring ports (8) is 45-60 m; the distance between two adjacent air return side monitoring ports (9) is 25-35 m; the number of the first beam pipes is equal to that of the air inlet side monitoring ports (8) and corresponds to that of the air inlet side monitoring ports one to one, and the number of the second beam pipes is equal to that of the air return side monitoring ports (9) and corresponds to that of the air return side monitoring ports one to one.
3. The gob auto-ignition danger area monitoring structure according to claim 1, wherein: the length of the air inlet side sampling protection tube (4) and the air return side sampling protection tube (5) extending into the goaf (6) is not less than 150 m.
4. The gob auto-ignition danger area monitoring structure according to claim 1, wherein: and the air inlet side monitoring port (8) and the air return side monitoring port (9) are arranged towards the inner side of the goaf (6).
5. The gob auto-ignition danger area monitoring structure according to claim 1, wherein: and the air inlet side sampling protection pipe (4) and the air return side sampling protection pipe (5) are both steel pipes.
6. The gob auto-ignition danger area monitoring structure according to claim 1, wherein: the distance between the release end of the SF6 tracer gas release device (7) and one end of the goaf (6) close to the coal face (1) is 9-11 m.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798707A (en) * | 2020-12-29 | 2021-05-14 | 国家能源集团宁夏煤业有限责任公司 | Mining monitoring equipment and goaf gas monitoring method |
| CN114112558A (en) * | 2021-11-30 | 2022-03-01 | 西安科技大学 | Collecting space area coal spontaneous combustion intelligence developments circulating gas sampling prevention and control system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798707A (en) * | 2020-12-29 | 2021-05-14 | 国家能源集团宁夏煤业有限责任公司 | Mining monitoring equipment and goaf gas monitoring method |
| CN112798707B (en) * | 2020-12-29 | 2023-01-13 | 国家能源集团宁夏煤业有限责任公司 | Mining monitoring equipment and goaf gas monitoring method |
| CN114112558A (en) * | 2021-11-30 | 2022-03-01 | 西安科技大学 | Collecting space area coal spontaneous combustion intelligence developments circulating gas sampling prevention and control system |
| CN114112558B (en) * | 2021-11-30 | 2024-01-19 | 西安科技大学 | Goaf coal spontaneous combustion intelligent dynamic circulating gas sampling prevention and control system |
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