CN111894652A - Spontaneous combustion gel foam three-dimensional prevention and control system for steeply inclined coal seam - Google Patents

Spontaneous combustion gel foam three-dimensional prevention and control system for steeply inclined coal seam Download PDF

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CN111894652A
CN111894652A CN202010774981.0A CN202010774981A CN111894652A CN 111894652 A CN111894652 A CN 111894652A CN 202010774981 A CN202010774981 A CN 202010774981A CN 111894652 A CN111894652 A CN 111894652A
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foam
foaming
pipeline
module
spontaneous combustion
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CN111894652B (en
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陆新晓
刘梦华
沈聪
宋思远
幸运
史国钰
王明扬
陈斌
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China University of Mining and Technology Beijing CUMTB
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China University of Mining and Technology Beijing CUMTB
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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
    • E21F5/02—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires by wetting or spraying
    • E21F5/06—Fluids used for spraying
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
  • Pipe Accessories (AREA)

Abstract

The embodiment of the invention discloses a spontaneous combustion gel foam three-dimensional prevention and control system for a steeply inclined coal seam, and aims to inject gel foam into a spontaneous combustion zone of the steeply inclined coal seam for fire control. The system comprises an intelligent dragging trolley, a material box body, an adding module, a foaming module and a distributing module; the intelligent dragging trolley is in a rail type moving mode and is used for placing the foam box body, the adding module, the foaming module and the distributing module, and the moving speed of the intelligent dragging trolley is consistent with the propelling speed of a working surface; the adding module and the foaming module are arranged on the left side of the material box body in parallel, and the adding module is used for adding the material A and the material B; the foaming module is used for generating and uniformly mixing foam liquid and generating gel foam; the dispensing module is configured to dispense the generated foam to deliver the gel foam to the autoignition region. The device is integrated, and gel foam can be filled into the spontaneous combustion zone of the goaf by adopting three process modes of pipe burying at the air return side of the coal bed, goaf pipe insertion and bottom plate roadway pipe insertion.

Description

Spontaneous combustion gel foam three-dimensional prevention and control system for steeply inclined coal seam
Technical Field
The invention discloses a spontaneous combustion gel foam three-dimensional prevention and control system for a steeply inclined coal seam, relates to the treatment of coal seam ignition by pouring gel foam into a spontaneous combustion area of the steeply inclined coal seam, and belongs to the field of fire prevention and control of the steeply inclined coal seam.
Background
The goaf is the area where spontaneous combustion of the coal seam is most likely to occur and is the most serious, and the steeply inclined coal seam is more likely to spontaneously combust than the slowly inclined coal seam and the inclined coal seam in the mining process. The steeply inclined upper coal seam is mostly exposed and buried shallowly, the air leakage channel of the ground surface crack is more, the continuous oxygen supply condition is sufficient, and the treatment difficulty is increased. The steeply inclined coal seam has an overlarge coal seam inclination angle, so that the return air roadway and the air inlet roadway have a certain vertical height to cause an upward trend of air flow, the steeply inclined coal seam is influenced by mining, the ground surface is further collapsed, a large number of cracks are generated, air leakage channels in a fire area are increased, and air leakage quantity is increased. Therefore, when coal spontaneous combustion occurs in the goaf of the steeply inclined coal seam, the spontaneous combustion area gradually develops into a three-dimensional fire area in a three-dimensional spreading trend, and the upper spontaneous combustion area is outwards expanded due to the influence of fire air pressure in the original spontaneous combustion zone area, so that the fire control difficulty is increased.
In order to effectively prevent and treat spontaneous combustion of the steeply inclined coal seam, three methods of injecting gel foam into an air return side buried pipe, a goaf insertion pipe and a bottom plate roadway insertion pipe are correspondingly provided aiming at the characteristic of large inclination angle of the steeply inclined coal seam to extinguish fire, preparation and injection of the gel foam are integrated, the advancing speed of the integrated device is kept consistent with the advancing speed of a working face, and therefore intelligentization of injecting the gel foam into a spontaneous combustion zone of the goaf of the steeply inclined coal seam is achieved.
Disclosure of Invention
In view of this, the embodiment of the invention provides a stereoscopic prevention and control system for spontaneous combustion gel foam of a steeply inclined coal seam, and realizes effective treatment on spontaneous combustion areas of the steeply inclined coal seam.
The embodiment of the invention provides a spontaneous combustion gel foam three-dimensional prevention and control device for a steep coal seam, which comprises
The intelligent dragging trolley has the advancing speed consistent with the advancing speed of a working surface and is used for placing the material box body, the adding module, the foaming module and the distributing unit;
the material box body is arranged at the left side of the intelligent dragging trolley and is used for containing a material A, a material B and a foaming agent which generate gel foam;
the adding module is arranged on the right side of the foam box body and comprises a pump for adding the material A and the material B and a mixed liquid box body for containing the material A and the material B;
the foaming module and the adding module are arranged on the right side of the material box body in parallel, and the foaming module comprises a foaming box body and a foaming device and is used for fully mixing to form foam liquid and generate gel foam;
and the distribution unit is arranged at the rightmost side of the intelligent dragging trolley and is used for distributing and conveying the gel foam to the coal bed spontaneous combustion area.
Optionally, a track is arranged below the intelligent dragging trolley, the existing track of the working face is adopted for movement, and the advancing speed is consistent with the propelling speed of the working face.
Optionally, two adding pumps in the adding module are respectively connected with the box body containing the material A and the material B through pipelines, the material A and the material B are added into the mixed liquid box body through a first pipeline and a second pipeline, and a first valve and a second valve are respectively arranged on the first pipeline and the second pipeline to control the adding of the material A and the material B.
Optionally, the mixed liquid box body of the adding module is connected with an external pressurized water pipeline, and water flow enters the mixed liquid box body through the pressurized water pipeline and is fully stirred to form mixed liquid.
Optionally, the first valve and the second valve cannot be opened at the same time to add the material a and the material B into the mixed liquid tank.
Optionally, the foaming module includes a foaming box body and a foam generator device, the foaming agent in the material box body enters the foam liquid box body through a third pipeline, and is uniformly mixed with the mixed liquid to form foam liquid, and the foam generator device is connected with the foam liquid box body through a hose.
Optionally, the foremost end of the foam generator device is connected with an external compressed air pipeline to generate gel foam.
Optionally, the front end of the connecting hose is a reducing pipe, the hose is added under negative pressure, the length of the reducing pipe is 3-5 cm, and the contraction angle is beta1Is 10 to 15 degrees.
Optionally, the material a, the material B and the foaming agent are fully and uniformly mixed again by adopting a rotating blade at the hose connection rear end of the foaming device, and the foam liquid enters the foaming device by utilizing the pressure difference at the two ends.
Optionally, the foam generator device is connected with the external compressed air pipeline to provide power for the rotating blades, the rotating speed of the rotating blades is 400-1000 r/min, and the included angle r between the blades and the vertical plane1Is 30-60 degrees, and the twisting inclination r of the blade2Is 30 to 40 degrees.
Optionally, the rotating blade is fixed to the wall of the foaming device cavity through a pipeline, and the airflow enters through the pipeline and flows out from the round hole in the middle of the rotating blade, so that the airflow flow is increased, and the foaming amount of the foam liquid is increased.
Optionally, the nozzle of the foam maker adopts a divergent pipe with a divergence angle beta2Is 10 to 30 degrees.
Optionally, the foaming device foams through a mesh surface, and an included angle β between the mesh surface and a cavity wall of the foaming device3The mesh density of the middle area of the mesh surface is large, the diameter of the mesh is small, and the mesh density is gradually reduced along with the periphery far away from the center of the mesh surface.
Optionally, the distribution unit by the foam be responsible for with the foam maker device is connected, the foam branch pipe through a plurality of tee joints with the foam is responsible for continuously, the right side is connected with the trusteeship, the foam branch pipe with the connector of trusteeship adopts concentric circle structure, and interior circle is 0.85 ~ 0.95 with the diameter ratio of excircle, adopts the concentric circle structure of three-layer, and interior circle is 0.85 ~ 0.95 with the diameter ratio of excircle, and the excircle is connected with the rubber buffer for the outer ring of interior circle, the dolly horizontal migration that the concentric circle structure can keep the excircle to connect, and the inlayer ring of interior circle is connected the trusteeship can be along with the removal of device and incessantly rotate to reduce the pressure of the crushed coal that drops in the removal process.
The embodiment of the invention provides a spontaneous combustion gel foam three-dimensional prevention and control method for a steep coal seam, which comprises the following steps: when the gel foam is poured into the steeply inclined coal seam, three process modes of pipe burying at the air return side of the coal seam, pipe inserting in the goaf and pipe inserting in the bottom plate roadway can be adopted. When the air return side buried pipe is adopted, the pipeline is arranged along the air return side, so that the end part of the pipeline is buried to the edge of the spontaneous combustion zone of the goaf. The pipe keeps the same forward movement with the advance of the working face, ensuring that the end is always at the edge of the spontaneous combustion zone. When the process method of the goaf intubation is adopted, a pipeline is inserted into a goaf spontaneous combustion zone from a working face, the intubation closest to the air return side is positioned at the edge of the goaf spontaneous combustion zone, the length of the intubation is correspondingly increased along with the increase of the distance from the air return side to the lower intubation, the length of the intubation reaches the longest in the middle of the goaf, the distance between every two adjacent intubations is gradually increased, and the number and the distance of the intubations are adjusted according to the actual length of the working face. When the bottom plate roadway is adopted for inserting the pipe, a drilling site is arranged through the roadway adjacent to the mined coal seam, and the pipe for injecting the gel foam is inserted through the drilling hole.
Optionally, when the air return side buried pipe is adopted, the foremost end of the pipeline is located at the edge of a spontaneous combustion zone of the steeply inclined coal seam, gel foam is accumulated and diffused to the spontaneous combustion zone area of the goaf, the buried pipe length L is related to the size of the inclination angle alpha of the working face, namely, the L is equal to k alpha, and the k ranges from 1.1 to 1.5.
Optionally, when the goaf intubation is adopted, a tee joint is arranged on the coal face at a certain interval, the intubation is led out from the tee joint to enter the goaf spontaneous combustion zone, and the distance between adjacent intubation increases along with the increase of the distance with the return airway.
Optionally, the insertion pipes are distributed on the working face of the steeply inclined coal seam in a non-equidistant manner, that is, as the distance from the return airway increases, the distance between two adjacent insertion pipes increases, and the distances between the adjacent insertion pipes are in equal proportion, that is, L2/L1＝1.1～1.3。
Optionally, the length of the intubation tube is longer in the middle of the spontaneous combustion zone, the position of the middle part which faces upwards and downwards is gradually shortened, and the length a of two intubation tubes adjacent to the position above the middle part is the length a of the intubation tube1/A21.2-1.3, the lengths of the two adjacent insertion tubes at the position below the middle part meet A2/A3＝1.0～1.2。
Optionally, when the bottom plate lane is adopted for pipe insertion, foam is injected into the goaf by drilling adjacent bottom plate lanes, and the arrangement distance of the drilling sites is 15-30 m.
According to the spontaneous combustion gel foam three-dimensional prevention and control system for the steeply inclined coal seam, provided by the embodiment of the invention, the preparation and the filling of gel foam are integrated, the advancing speed of an integrated device is kept consistent with the advancing speed of a working surface, the end of a buried pipe is ensured to be always positioned at the edge of a spontaneous combustion zone of a goaf, the filled gel foam is accumulated and diffused to the whole spontaneous combustion zone, and the problem that the fire extinguishing material is difficult to cover the whole fire area due to the overlarge inclination angle of the steeply inclined coal seam is effectively solved. Moreover, the preparation units of the gel foam are integrated, the integration of adding and foaming of the gel material is realized, and the movement flexibility of the whole device is increased when the spontaneous combustion fire of the mine is treated. In addition, the power of the preparation unit is derived from underground wind flow, the possibility of generating electric sparks is reduced, and the safety performance of the device is improved. When the gel foam is poured into the spontaneous combustion zone of the goaf, three different process methods of air return roadway pipe burying, goaf pipe inserting and bottom plate roadway pipe inserting can be adopted, the length of the pipe burying and the distance between the pipe inserting are adjusted according to the angle of the steeply inclined coal seam, the gel foam is ensured to cover the whole spontaneous combustion zone of the goaf, therefore, the complete and rapid prevention and control of spontaneous combustion of coal in the goaf are realized, and the technical guarantee is provided for the safe production of mines.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a solid prevention and control device for spontaneous combustion gel foam in a steeply inclined coal seam;
FIG. 2 is a foamer device of a foaming unit;
FIG. 3 is a front view of a rotating blade in the foamer device;
FIG. 4 is a side view of a rotating blade in the foamer device;
FIG. 5 is a side view of the foam web in the foamer device;
FIG. 6 is a concentric circular configuration between the foam legs and the support tubes;
FIG. 7 is a perspective view of a process for filling a self-ignition gel foam return side buried pipe and a middle insertion pipe in a steep coal seam;
FIG. 8 is a plan view of a process for filling a pipe in a spontaneous combustion gel foam bottom roadway of a steeply inclined coal seam;
fig. 9 shows the manner of inserting the tubes in the middle of the goaf.
In fig. 1: 1-an intelligent dragging trolley; 2-a material box; 3-adding a module; 4-a foaming module; 5-A material box body; 6-B material box body; 7-a foaming agent tank body; 8-adding a pump box body; 9-a mixed liquid box body; 10-foam liquid box body; 11-a foamer device; 12-a concentric circle configuration; 13-hosting; 14-a pressurized water pipeline interface; 15-compressed air pipeline interface;
in fig. 2: 11-1-a reducer; 11-2-rotating fan blades; 11-3-foaming mesh surface; 16-a suction hose;
in fig. 6: 12-1-outer circle of concentric circle structure; 12-2-outer layer ring of inner circle of concentric circle structure; 12-3-inner layer ring of inner circle of concentric circle structure; 12-4-rubber stopper;
in fig. 7: 17-burying the pipe at the air return side; 18-a gob spontaneous combustion zone; 19-a middle cannula; 20-steeply inclined coal seam;
in fig. 8: 21-floor lane pipe insertion; 22-adjacent coal seam main roadway.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a solid prevention and control device for spontaneous combustion gel foam in a steeply inclined coal seam according to an embodiment of the present invention, as shown in fig. 1, the device includes five major parts, which are: the intelligent dragging trolley 1 positioned at the bottommost layer of the whole device has the same advancing speed as the advancing speed of the working surface, so that the gel foam is ensured to be accurately filled to a spontaneous combustion zone; the material box body 2 is positioned at the leftmost side of the intelligent dragging trolley 1 and is used for containing materials for generating gel foam; add module 3, be located the right side of material box 2, add two in the module 3 and add pump 8 and link to each other with the box 5 that holds A material and the box 6 of B material respectively through the pipeline to be connected with mixed liquid box 9 through first pipeline and second pipeline, be equipped with first valve and second valve respectively on first pipeline and the second pipeline and control the interpolation of A material and B material respectively. The right side of the mixed liquid box body is provided with an orifice 14 which is connected with an external pressurized water pipeline; the foaming module 4 and the adding module 3 are arranged on the right side of the material box body 2 in parallel and mainly comprise a foaming box body 10 and a foam generator device 11, the rear side of the foaming box body 10 is connected with the mixed liquid box body 9 through a pipeline, the left side of the foaming box body 10 is connected with a box body 7 which is used for storing foaming agents and arranged in the foaming box body through a third pipeline, the lower side of the foaming box body 10 is connected with the foam generator device 11 through a hose, and the front side of the foam generator device 11 is connected with an external compressed air pipeline through an orifice 15; a supporting pipe 13 in the distribution unit is connected with the right side of the foam maker device 11 through a concentric circle structure 12, and the air return side connected with the right side of the supporting pipe 13 is buried to the edge of a spontaneous combustion zone of the goaf, so that gel foam is accumulated, diffused and poured into the whole ignition area.
Optionally, as shown in fig. 1, a track is arranged below the intelligent dragging trolley 1, the track existing on the working surface is adopted for movement, and the advancing speed is consistent with the propelling speed of the working surface.
Alternatively, as shown in fig. 1, in the foam tank 2, the tank body a 5 and the tank body B6 are arranged on the left and right sides and are jointly installed on the rear side of the foaming agent tank 7.
Optionally, the distribution unit is connected with the foam maker device through a foam main pipe, the foam branch pipe is connected with the foam main pipe through a plurality of tee joints, and the right side of the foam branch pipe is connected with the support pipe.
In this embodiment, as shown in fig. 2, the foremost end 11 of the foam maker device is connected to an external compressed air pipe, and the diameter of the front end pipe 11-1 of the interface of the hose 16 is gradually reduced to the minimum at the connection position of the hose 16. The rear end of the joint of the hose 16 is provided with a blade 11-2 for stirring and fully mixing the foaming liquid again, the right end of the blade is provided with a multi-layer foaming net device 11-3, and the liquid generates foam through the foaming net. The foam main pipe is connected with the right end of the foam maker device and is connected with the foam branch pipes through a plurality of tee structures.
Optionally, as shown in fig. 2, the front end of the connection hose 16 is a tapered pipeline 11-1, the hose 16 is added under negative pressure, the length of the tapered pipeline is 3-5 cm, and the contraction angle β is1Is 10 to 15 degrees.
Optionally, as shown in fig. 2, the rear end of the hose of the foam maker device is connected with a rotating blade 11-2 to fully mix the material a, the material B and the foaming agent uniformly again, and the mixed liquid enters the foam maker device by using the pressure difference between the two ends.
Optionally, as shown in fig. 3 and 4, the rotating blade is fixed in the foam maker device through a pipeline, the power of the rotating blade is provided by the wind flow of the external compressed air pipeline, the rotating speed of the rotating blade is 400-1000 r/min, and the included angle r between the blade and the vertical plane is1Is 30-60 degrees, and the twisting inclination r of the blade2Is 30 to 40 degrees. As shown in figure 3, the wind flow enters through the pipeline of the fixed rotating blade and flows out from the middle round hole, the flow rate of the wind flow is increased, and the foaming amount of the foam liquid is increased.
Alternatively, as shown in FIG. 2, the foam maker nozzle is a diverging pipe with a divergence angle β210-30 degrees, the foaming mesh surface adopts a multilayer mesh structure, the diameter of the cavity is gradually enlarged, and the mesh surface fixed on the cavity wall is outwards in a certain radian, and the included angle beta between the mesh surface and the cavity wall3Is 8-15 degrees, as shown in figure 5, along with the increase of the distance from the circle center of the foaming net surface, the diameter of the net holes on the net surface is increased, the density of the net holes is reduced, and the diameter D of the net holes in the same area is increased2/D1＝1.5～2.5，D3/D2＝1.2～2。
This embodiment, as shown in fig. 6, trusteeship and foam branch pipe are connected by the concentric circles structure, the diameter ratio of interior circle and excircle is 0.85 ~ 0.95, the concentric circles structure divide into the three-layer, interior circle is bilayer structure, the excircle links to each other with the foam branch pipe of left device distribution unit, guarantee the horizontal migration of device, the inlayer ring of interior circle adopts rotatable steel ring, it links to each other with the trusteeship on right side, guarantee that the trusteeship can rotate in order to reduce frictional resistance and coal breakage pressure when removing, be equipped with the rubber buffer between the outer ring of interior circle and the excircle, prevent revealing of foam liquid.
The spontaneous combustion gel foam three-dimensional prevention and control method for the steeply inclined coal seam provided by the embodiment two of the invention is based on any spontaneous combustion gel foam three-dimensional prevention and control system for the steeply inclined coal seam described in the embodiment one, and comprises the following steps: an external pressure water pipeline and an external pressure air pipeline are connected into a corresponding mixed liquid box body 9 of an adding module 3 and a foaming device 11 of a foaming module 4, the mixed liquid is injected into the mixed liquid box body 9 through a pressure water pipeline connector 14, an adding pump 8 is sequentially and respectively started to respectively add a material A and a material B into the mixed liquid box body 9 through a first pipeline and a second pipeline, a first valve and a second valve on the first pipeline and the second pipeline are respectively used for controlling the addition of the material A and the material B, clear water, the material A and the material B are uniformly mixed and then enter a foam liquid box body 10 of the foaming module 4 through a pipeline, a foaming agent in a material box body 2 is injected into the foam liquid box body 10 through a third pipeline to be mixed to form foam liquid, air flow enters the foaming device 11 through an external pressure air pipeline connector 15, the pipeline diameter at the front end of a hose 16 connector is gradually reduced, the flow rate is fixed, the flow velocity at the position with the smaller cross section is larger, the flow velocity is increased according to the Bernoulli equation, the pressure is reduced, so the foam liquid connected with the hose 16 enters the foam maker device 11 under the action of gravity and pressure difference, the wind flow provides rotating power for the blades, the rotating blades mix the foam liquid again, the flow of the foam liquid is accelerated due to the pressure difference, and the foam realizes high-multiple foaming through the wind flow increased in the middle of the rotating blades and meshes of the multi-layer mesh surface.
Optionally, the first valve and the second valve cannot be opened at the same time to add the material a and the material B into the mixed liquid tank.
Optionally, a stirring device is installed in the mixed liquid tank of the adding module and the foam liquid tank of the foaming module to realize uniform mixing of the liquid, and power of the stirring device is provided by underground airflow.
Optionally, a check valve is arranged on a pipeline connecting the mixed liquid box body of the adding module and the foam liquid box body of the foaming module, so that backflow of the foam liquid is prevented.
As shown in fig. 2, the angle beta between the net surface and the cavity wall3The angle is 8-15 degrees, the area of the net surface is increased, so that the number of meshes in the net surface is increased, and the speed of the axis foam is reduced along with the increase of the distance between the center of the net surface and a foam outlet, so that the retention time on the net surface is increased, and the foaming number of the foam is increased. As shown in figure 3, the wind flow enters through the pipeline of the fixed rotating blade and flows out from the middle round hole, the flow rate of the wind flow is increased, and the foaming amount of the foam liquid is increased.
The main foam pipe is connected with the foam maker device, the foam branch pipes and the main foam pipe are connected through a plurality of tee joints, and the support pipes are respectively connected with the corresponding foam branch pipes through concentric circle structures. Foam is injected into the spontaneous combustion zone of the gob through the foam generator device through the pipeline, the intelligent dragging trolley moves forwards according to the propelling speed of the working face, and the foam pipeline is dragged to enable the foam to be accurately and continuously injected into the spontaneous combustion zone area of the gob. Alternatively, the pipe may be rotated and moved to reduce frictional resistance and the pressure of the crushed coal by a concentric circular structure.
As shown in FIG. 7, the pouring process method of the spontaneous combustion gel foam of the steeply inclined coal seam comprises three types of coal seam air return side buried pipes 17, goaf insertion pipes 19 and floor roadway insertion pipes 21. Because the spontaneous combustion zone 18 in the goaf of the steeply inclined coal seam 20 is sufficient in oxygen and has a heat storage condition for most easily firing, under normal conditions, the distance between the edge of the spontaneous combustion zone 18 and a mining working surface is 20-40 m, but on one hand, due to the influence of an upward ventilation channel and a crack return air channel, air flow can penetrate through the spontaneous combustion zone from an air inlet channel and converge to an air return channel, on the other hand, due to the fact that the temperature of the spontaneous combustion zone 18 is increased, the air density is reduced and causes a density difference with the outside air, the combined action of the natural pressure difference and the fire air pressure enables a high area in the spontaneous combustion zone 18 to extend outwards, and the distance between the edge of the.
As shown in fig. 7, when the process of burying the pipe 17 at the air return side is adopted, firstly, the foam pipe is buried in the air return main roadway at the upper part of the gob in advance, due to the influence of the fire air pressure, the length of the buried pipe is controlled to enable the end of the pipe to be positioned at the edge of the expanded spontaneous combustion zone, gel foam is injected by the foam generator device through the pipe, accumulated and diffused to the spontaneous combustion zone to cover the whole ignition area, and the device drags the pipe outwards along with the forward propulsion of the coal face, so that the end of the buried pipe is always kept at the edge of the spontaneous combustion zone.
Suppose the fire wind pressure is HfThe gas density in the high-temperature region before the fire is rho0The density of the flue gas in a high-temperature area after ignition is rhosH is the high temperature influence height of the fire area, and the computational formula of the fire wind pressure which can be deduced by the fluid statics is as follows:
Hf＝(ρ0-ρs)gH
assuming that the atmospheric pressure in the tunnel is approximately constant before and after the fire, the gas temperatures before and after the spontaneous combustion fire are respectively expressed as T0，TsThe expression of fire wind pressure with respect to temperature can be obtained in combination with Gay Lussac's law:
Figure BDA0002618062750000091
let t0Ambient atmospheric temperature, tsThe temperature t of gas in the return air crack of the coal mine fired areafFor the temperature of a combustion coal bed, L is the distance from a certain point of a return air crack to a high-temperature coal bed, an A.phi.Bopo pi o B-B formula is referred, and the temperature distribution of the return air crack of a firing area under a coal mine meets the formula:
ts＝t0+(tf-t0)exp-(L/A)
a is a temperature decay index, and in a specific fire zone, A can be considered to be related to the temperature of the fire zone only.
Wherein, the fire wind pressure of some point in the return air crack is:
Figure BDA0002618062750000092
assuming that the inclination angle of the return air crack is theta, substituting the formula of temperature distribution into the above formula to obtain a distribution equation of the fire and air pressure in the return air crack, and performing integral calculation on two sides of the equation to obtain the fire and air pressure value in the fire area as follows:
Figure BDA0002618062750000093
from the above formula, it can be seen that the fire air pressure in the fire area is mainly related to the coal seam temperature, the coal seam fire height and the return air crack inclination angle in the fire area. The ignition height and the return air crack inclination angle of the underground coal seam are related to the inclination angle of the mining working face, so the ignition wind pressure is indirectly related to the inclination angle of the coal seam mining working face, and the boundary range of the spontaneous combustion zone of the goaf also has a certain relation with the inclination angle of the mining working face, so that the length L of the buried pipe and the inclination angle alpha of the coal seam meet the relation L which is k alpha when the foam pipeline is buried in advance, and k is 1.1-1.5.
As shown in fig. 7, when the process mode of the goaf middle insertion pipe 19 is adopted, a foam pipeline is laid along the mining working face, a tee joint position is reserved at a certain distance, the insertion pipe is led out by the tee joint, the distance between the tee joints reserved near the return air side is short due to the influence of fire wind pressure, the insertion pipe is short, the distance between the tee joints near the air inlet side is large, and the insertion pipe is long.
As shown in fig. 9, optionally, the insertion pipes are distributed on the working face of the steeply inclined coal seam in a non-equidistant manner, that is, as the distance from the return airway increases, the distance between two adjacent insertion pipes increases, and the distances between two adjacent insertion pipes are in equal proportion, that is, L2/L11.1 ~ 1.3, the total arc distribution of collecting space area intubate length, the intubate length in the middle part of collecting space area is the longest, and the intubate length more than the middle part satisfies A1/A21.2-1.3, the length of the intubation tube below the middle part satisfies A2/A3＝1.0～1.2。
As shown in fig. 8, when the process of inserting the tube 21 into the floor roadway is adopted, a drill site is formed in the roadway 22 of the adjacent coal seam for drilling, and gel foam is injected into the spontaneous combustion zone of the goaf through the drill hole. Optionally, the arrangement distance of the drill sites is 15-30 m.
As shown in fig. 7 and 8, optionally, when the gel foam is poured by adopting three process modes of the coal bed air return side buried pipe 17, the goaf insertion pipe 19 and the bottom plate lane insertion pipe 21, in order to prevent broken coal from blocking the pipeline, the part of the end of the gel foam poured into the pipeline is in a mesh form.
The spontaneous combustion gel foam three-dimensional prevention and control system for the steeply inclined coal seam integrates the preparation and the filling of gel foam, the advancing speed of the integrated device is kept consistent with the advancing speed of a working face, the end of the buried pipe is guaranteed to be always located at the edge of a spontaneous combustion zone of a goaf, the filled gel foam is accumulated and diffused to the whole spontaneous combustion zone, and the problem that the steeply inclined coal seam is difficult to cover the whole ignition area due to fire extinguishing materials with overlarge inclination angles is effectively solved. Moreover, the preparation units of the gel foam are integrated, the integration of adding and foaming of the gel material is realized, and the movement flexibility of the whole device is increased when the spontaneous combustion fire of the mine is treated. In addition, the power of the preparation unit is derived from underground wind flow, the possibility of generating electric sparks is reduced, and the safety performance of the device is improved. When the gel foam is poured into the spontaneous combustion zone of the goaf, three different process methods of air return roadway pipe burying, goaf pipe inserting and bottom plate roadway pipe inserting can be adopted, the length of the pipe burying and the distance between the pipe inserting are adjusted according to the angle of the steeply inclined coal seam, the gel foam is ensured to cover the whole spontaneous combustion zone of the goaf, therefore, the comprehensive and rapid prevention and control of spontaneous combustion fire of coal in the goaf are realized, and the technical guarantee is provided for the safe production of mines.
It is noted that, herein, relational terms such as first, second, third, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "connected" and "coupled" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The terms "rear," "right," "upper," and the like, indicate an orientation or positional relationship that does not indicate or imply that the device being referred to must be in a particular orientation and, therefore, should not be taken to limit the patent. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (13)

1. Spontaneous combustion gel foam three-dimensional prevention and control system of steeply inclined coal seam, its characterized in that includes:
the intelligent dragging trolley has the advancing speed consistent with the advancing speed of a working surface and is used for placing the foam box body, the adding module, the foaming module and the distributing unit;
the material box body is arranged at the left side position of the intelligent dragging trolley and is used for containing gel foam materials;
the adding module is arranged on the right side of the foam box body and used for adding clean water, the material A and the material B;
the foaming module and the adding module are arranged on the right side of the foam box body in parallel and used for generating and uniformly mixing foam liquid and generating gel foam;
and the distribution unit is arranged at the rightmost side of the intelligent dragging trolley and is used for distributing and conveying the gel foam to the coal bed spontaneous combustion area.
2. The system of claim 1, wherein a track is arranged under the intelligent dragging trolley, the track movement of the working surface is adopted, and the traveling speed is consistent with the propelling speed of the working surface through data calculation.
3. The system of claim 1, wherein the material tank comprises a tank body A, a tank body B and a foaming agent tank body, wherein the tank body A and the tank body B are placed at the left and right and are jointly arranged at the rear side of the foaming agent tank body.
4. The system of claim 1, wherein the adding module comprises an adding pump and a mixed liquid tank, the mixed liquid tank is connected with the adding pump foam tank through a pipeline, and respectively adds the material A and the material B through a first pipeline and a second pipeline, and a first valve and a second valve are respectively arranged on the first pipeline and the second pipeline to respectively control the adding of the material A and the material B.
5. The system of claim 1, wherein the right side of the mixing liquid tank in the adding module is provided with an opening for connecting an external pressure water pipeline to control the adding of clear water, and the mixing liquid tank is provided with a stirring device for uniformly mixing liquid.
6. The system of claim 1, wherein the foaming module comprises a foam liquid tank body and a foaming device, the foam liquid tank body is connected with the mixed liquid tank at the rear side, the left side is connected with the foaming agent tank body through a third pipeline for adding foaming agent and mixing to form foam liquid, and the foaming device is connected with the foaming tank body through a hose for generating gel foam.
7. The system of claim 6, wherein the front end of the foam generator device adopts a rotating blade to fully and uniformly mix the material A, the material B and the foaming agent, the mixed liquid enters the foam generator device by utilizing the pressure difference of the two ends, the foam generator device is connected with an external compressed air pipeline to provide power for the rotating blade, the included angle between the blade and a vertical plane is 30-60 degrees, and the twisting inclination of the blade is 30-40 degrees.
8. The system of claim 7, wherein the rotating blades are fixed on the wall of the foaming device cavity through a pipeline, and the air flow enters through the pipeline and flows out from a round hole in the middle of the rotating blades, so that the flow rate of the air flow is increased, and the foaming amount of the foaming liquid is increased.
9. The system as claimed in claim 6, wherein the foam generator foams through a net surface, the included angle between the foaming net surface and the cavity wall is 8-15 degrees, the mesh density of the middle area of the foaming net surface is large, the mesh diameter is small, and the density of peripheral meshes away from the center of the net surface is gradually reduced.
10. The system of claim 1, wherein the distribution unit is responsible for by the foam with the bubbler device is connected, foam branch pipe through a plurality of tee joints with the foam is responsible for and is linked to each other, and the right side is connected with the trusteeship, foam branch pipe with the connector of trusteeship adopts the concentric circle structure of three-layer, and the diameter ratio of interior circle and excircle is 0.85 ~ 0.95, and the excircle is connected with the rubber buffer for the outer ring of interior circle, the dolly horizontal migration that the excircle is connected can be kept to the concentric circle structure, and the trusteeship that the inlayer ring of interior circle is connected can be along with the removal of device and incessantly rotate to reduce the pressure of the broken coal that drops in the removal process.
11. The system of claim 1, comprising: when the gel foam is poured into the steeply inclined coal seam, the process modes of air return side buried pipes, goaf pipe insertion and bottom plate roadway pipe insertion of the mined coal seam can be adopted.
12. The system of claim 11, wherein when the return-air-side buried pipe is adopted, the foremost end of the pipeline is positioned at the edge of the spontaneous combustion zone of the steeply inclined coal seam, the gel foam can be diffused to the spontaneous combustion zone of the goaf, and the length L of the buried pipe is related to the size of the inclination angle alpha of the working face, namely L is equal to k alpha, and k is in the range of 1.1-1.5;
when the goaf intubation is adopted, a tee joint is arranged on a coal face at a certain interval, intubation tubes are led out from the tee joint to enter the goaf, the distance between every two adjacent intubation tubes is increased along with the increase of the distance between the intubation tubes and a return airway, the overall length of the intubation tubes in the goaf is distributed in an arc shape, the length of the intubation tubes in the middle of the goaf is the longest, and the lengths of the intubation tubes at the two sides of the middle of the goaf are shortened to different.
When the bottom plate lane is adopted for pipe insertion, foam is injected into the goaf by drilling adjacent bottom plate lanes, and the arrangement distance of drilling sites is 15-30 m.
13. The system of claim 11, wherein the spigots are non-equidistantly spaced on the working face of the steeply dipping seam, and the spacing between adjacent spigots is in equal proportion, i.e., L2/L11.1-1.3, the length A of the two adjacent insertion tubes at the position above the middle part1/A21.2-1.3, the lengths of the two adjacent insertion tubes at the position below the middle part meet A2/A3＝1.0～1.2。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114653821A (en) * 2022-05-23 2022-06-24 四川思宇通信工程有限公司 Pipeline splashproof punching device for autogenous pressure suction formula construction

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201271445Y (en) * 2008-10-07 2009-07-15 兴化锁龙消防药剂有限公司 Novel high multiple foam generator
CN102979552A (en) * 2012-12-05 2013-03-20 山东科技大学 Device for preventing coal from burning spontaneously and rapidly extinguishing under coal mine and working method thereof
CN110792469A (en) * 2019-11-22 2020-02-14 安徽理工大学 Inclined coal seam overlength stope face gas and coal spontaneous combustion cooperative treatment method
CN111013055A (en) * 2019-12-26 2020-04-17 安徽理工大学 Mobile gel foam intelligent generation device and use method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201271445Y (en) * 2008-10-07 2009-07-15 兴化锁龙消防药剂有限公司 Novel high multiple foam generator
CN102979552A (en) * 2012-12-05 2013-03-20 山东科技大学 Device for preventing coal from burning spontaneously and rapidly extinguishing under coal mine and working method thereof
CN110792469A (en) * 2019-11-22 2020-02-14 安徽理工大学 Inclined coal seam overlength stope face gas and coal spontaneous combustion cooperative treatment method
CN111013055A (en) * 2019-12-26 2020-04-17 安徽理工大学 Mobile gel foam intelligent generation device and use method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
秦波涛: "《防治煤炭自燃的三相泡沫新技术及应用》", 《中国会议》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114653821A (en) * 2022-05-23 2022-06-24 四川思宇通信工程有限公司 Pipeline splashproof punching device for autogenous pressure suction formula construction

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