CN215170172U - High gas and high hydrogen sulfide advanced treatment system in coal tunnel construction period - Google Patents
High gas and high hydrogen sulfide advanced treatment system in coal tunnel construction period Download PDFInfo
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- CN215170172U CN215170172U CN202022880288.XU CN202022880288U CN215170172U CN 215170172 U CN215170172 U CN 215170172U CN 202022880288 U CN202022880288 U CN 202022880288U CN 215170172 U CN215170172 U CN 215170172U
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Abstract
The utility model relates to a wear high gas high hydrogen sulfide advanced treatment system of coal tunnel construction period belongs to tunnel construction technical field. The utility model discloses a high gas and high hydrogen sulfide advanced treatment system during coal tunnel construction period, which comprises a water tank, a liquid injection pump, a flowmeter, a pressure gauge, a stop valve and a liquid injection pipe which are connected in turn through a high-pressure pipe, and can inject absorption liquid into a coal seam in advance, so that the hydrogen sulfide in the coal seam is neutralized with the absorption liquid on one hand, and the emission amount of the hydrogen sulfide in the coal uncovering process of tunnel excavation is reduced; on the other hand, the liquid injection in the coal seam in advance can increase cracks in the coal seam, so that a gas circulation channel is provided for the advanced gas drainage of the coal seam, the gas drainage efficiency is improved, and the gas drainage time is saved.
Description
Technical Field
The utility model belongs to the technical field of the tunnel construction, concretely relates to wear high gas high hydrogen sulfide advanced treatment system of coal tunnel construction period.
Background
In recent years, the infrastructure construction of China gradually shifts to western mountainous areas, the western mountainous areas build high-grade roads in a large scale, and mountain-crossing tunnels are important components for building roads and railways in the western mountainous areas. Provinces and cities such as Guizhou, Sichuan, Chongqing, Ningxia and the like are important coal and natural gas production bases in China, tunnels are built in the regions and are difficult to pass through coal strata or oil and gas reservoirs, and the tunnels face the threat of gas disasters and hydrogen sulfide disasters during construction period of facilities. The tunnels such as the HuaYingfan mountain road tunnel, the Shanghanhongrong road temple tunnel, the Wulong-Shunjiang road cloudiness tunnel and the Yuqian railway sky terrace tunnel which are built in the western region all have hydrogen sulfide and gas disasters in the construction process, the gas pressure of a coal seam is up to 1.87MPa, and the concentration of the hydrogen sulfide is up to 50.71 ppm. And the tunnel is hung on the road from Qinghai Mandela to Datong road under construction, the phenomenon of water vapor gushing occurs during construction, the actually measured gas concentration is up to 2.5 percent, the concentration of hydrogen sulfide is over 100ppm, and the concentration far exceeds 0.5 percent and 6.6ppm of the standard requirement. The gas pressure of the coal bed is large, the emission amount is high, and disasters such as coal and gas outburst or gas explosion are easily caused; hydrogen sulfide is acute and virulent, a small amount of high-concentration hydrogen sulfide is deadly in a short time after being inhaled, and the low-concentration hydrogen sulfide has influence on eyes, respiratory systems and central nerves of people. Therefore, gas and hydrogen sulfide have become important factors seriously threatening the safety of tunnel construction and the progress of tunnel construction.
The research on the prevention and control of gas and hydrogen sulfide disasters at home and abroad mainly focuses on the coal mining field, and related research in the traffic tunnel field is relatively lacked. The treatment of high gas and high hydrogen sulfide in the construction period of the tunnel penetrating through the coal measure stratum mainly comprises the following three aspects:
(1) the advanced drilling hole is pre-pumped and pre-drained, so that the gas pressure of the coal bed is reduced, and the gas emission amount of the coal bed is reduced;
(2) construction ventilation is enhanced, and the concentration of gas hydrogen sulfide in air in the tunnel is reduced;
(3) spraying alkali liquor or quicklime on the palm surface to neutralize hydrogen sulfide in the air.
However, because the coal seams in China are very low in air permeability and mostly belong to coal seams which are difficult to extract, the pre-drilling and pre-draining time is long, and the expected effect is difficult to achieve, the prevention and the treatment of gas and hydrogen sulfide disasters by penetrating through coal series stratum tunnels are mainly realized by strengthening construction ventilation and spraying alkali liquor or quicklime on tunnel faces, and the method belongs to the passive control of the gas or hydrogen sulfide disasters. Therefore, an active advanced efficient treatment system for gas and hydrogen sulfide in tunnels penetrating through coal measure strata is needed.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the present invention is to provide a high gas and high hydrogen sulfide advanced treatment system during coal tunnel construction.
In order to achieve the above purpose, the utility model provides a following technical scheme:
1. the utility model provides a wear high gas high hydrogen sulfide advanced treatment system of coal tunnel construction period, the system is including water tank 1, liquid filling pump 2, flowmeter 3, manometer 4, stop valve 5 and notes liquid pipe 6 that loop through high-pressure tube 7 and connect.
Preferably, a safety valve 8 is arranged between the water tank and the liquid injection pump.
Preferably, the liquid injection pipe is arranged in the liquid injection hole of the tunnel and is conveyed to the bottom of the hole along the axis of the drill hole.
Preferably, the pressure-bearing capacity of the liquid injection pipe is greater than the liquid injection pressure P in the treatment process0。
Preferably, the pressure-bearing capacity of the liquid injection pipe is 3P0。
Preferably, the top of the liquid injection pipe is positioned on the pipe wall of the coal seam in the tunnel, a plurality of sieve holes with the diameter of about 1cm are prefabricated on the pipe wall, and the top of the liquid injection pipe is closed to ensure that the absorption liquid flows out along the coal seam and is injected into the coal seam.
The beneficial effects of the utility model reside in that: the utility model discloses a high gas and high hydrogen sulfide advanced treatment system during coal tunnel construction period, which comprises a water tank, a liquid injection pump, a flowmeter, a pressure gauge, a stop valve and a liquid injection pipe which are connected in turn through a high-pressure pipe, and can inject absorption liquid into a coal seam in advance, so that the hydrogen sulfide in the coal seam is neutralized with the absorption liquid on one hand, and the emission amount of the hydrogen sulfide in the coal uncovering process of tunnel excavation is reduced; on the other hand, the liquid injection in the coal seam in advance can increase cracks in the coal seam, so that a gas circulation channel is provided for the advanced gas drainage of the coal seam, the gas drainage efficiency is improved, and the gas drainage time is saved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a layout diagram in the process of plugging a liquid injection hole, wherein 9 is a coal seam, 10 is a rock stratum, 11 is a hole sealing material, 6 is a liquid injection pipe, and 12 is a grouting pipe;
FIG. 2 is a high gas and high hydrogen sulfide advanced treatment system in a coal tunnel construction period, wherein 1 is a water tank, 2 is a liquid injection pump, 3 is a flow meter, 4 is a pressure gauge, 5 is a stop valve, 6 is a liquid injection pipe, 7 is a high-pressure pipe, 8 is a safety valve, 13 is an extraction pipe, 14 is an extraction hole, 15 is a liquid injection hole, 16 is a face, and 17 is a coal bed;
FIG. 3 is a diagram showing the arrangement between the system and the coal seam in the advanced treatment process of high gas and high hydrogen sulfide of the present invention;
fig. 4 is a sectional view (a) and a perspective view (b) of the high gas and high hydrogen sulfide advanced treatment process of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the following embodiments, features in the embodiments may be combined with each other without conflict.
Examples
A method for performing advanced treatment on high gas and high hydrogen sulfide in a coal tunnel construction period by adopting a high gas and high hydrogen sulfide advanced treatment system in the coal tunnel construction period comprises the following steps:
1. and when the vertical distance between the tunnel face excavated and the coal bed is 10m, stopping excavating the tunnel face.
2. Calculating the number n of liquid injection holes:
(1) calculating the pressure P of the injected liquid according to the formula0＝5.85MPa，
Wherein, the tunnel buried depth H is 300 m;
(2) calculating to obtain a single-hole liquid injection range r of the liquid injection hole as 10.9m through a formula II,
wherein the density rho of the absorption liquid is 1.02 multiplied by 103kg/m3Permeability k is 6 × 10-11m2The kinematic viscosity μ is 1.005 × 10-3Pa.s, source term q 5.94 kg/(m)3S), filling pressure P0＝5.85MPa；
(3) The number n of the liquid filling holes is 6 through the formula (I),
wherein the coal seam area controls the liquid injection area Sc＝2193m2Single hole filling range S of filling holef＝373m2Tunnel excavation height Hz9.8 m; tunnel excavation width D is 12.5m, coal seam inclination angle alpha is 30 DEG, and safe distance L is beyond tunnel top excavation contour line120m, safe distance L outside tunnel bottom excavation contour line2Safe distance L beyond the excavation contour line of two sides of the tunnel of 12m315m, and the single-hole injection range r of the injection hole is 10.9 m.
3. Designing an arrangement mode of the liquid injection holes and the pre-drainage holes according to the number n of the liquid injection holes being 6 and the arrangement distance of the pre-drainage holes in the coal seam, and then drilling the advanced holes into the coal seam by a palm face to form the liquid injection holes;
4. drilling a liquid injection hole into the coal bed from the palm surface through an explosion-proof drilling machine, drilling a coal sample, and testing to obtain the coal bed with the gas content of 6.8m3T, gas pressure 0.63MPa, hydrogen sulfide content 0.005m3Testing porosity by 26%, and calculating and controlling total gas Q in liquid injection regionc＝31316m3，
Qc＝qcρcScHc＝qcHc(L1+Hz/sinα+L2)(D+2L3) ④，
In the formula, the coal bed gas content qc＝0.68m3T, coal bed volume weight rhoc＝1.4t/m3Coal seam thickness HcControlling the coal seam area S of the liquid injection area as 1.5mc＝2193m2Safe distance L outside tunnel top excavation contour line120m, safe distance L outside tunnel bottom excavation contour line2Safe distance L beyond the excavation contour line of two sides of the tunnel of 12m315m, tunnel excavation height HzThe coal seam inclination angle alpha is equal to 30 degrees, and the tunnel excavation width D is equal to 12.5 m;
5. fig. 1 is a layout diagram in the process of plugging a liquid injection hole (wherein 9 is a coal seam, 10 is a rock stratum, 11 is a hole sealing material, 6 is a liquid injection pipe, and 12 is a grouting pipe), the liquid injection hole is plugged according to fig. 1 (cement mortar is used for plugging in the plugging process, the hole sealing depth is not less than 7m), and the liquid injection hole is kept still for more than 72 hours after plugging is completed.
6. The high gas and high hydrogen sulfide advanced treatment system comprises a water tank 1, a liquid injection pump 2, a flowmeter 3, a pressure gauge 4, a stop valve 5 and a liquid injection pipe 6 which are sequentially connected through a high-pressure pipe 7, wherein a safety valve 8 (shown in figure 2) is arranged between the water tank and the liquid injection pump, the high gas and high hydrogen sulfide advanced treatment system also comprises an extraction pipe 13, an extraction hole 14, a liquid injection hole 15, a tunnel face 16 and a coal seam 17, the other end of the liquid injection pipe is arranged in the liquid injection hole in the coal seam, and absorption liquid (composed of absorbent sodium bicarbonate and water) is sent to the bottom of the liquid injection hole along the axis of a drill hole;
wherein the single-hole injection amount m of the absorbent is 10.9kg through the formula,
m＝3883.9q0Hcπr2 ⑤
in the formula, the hydrogen sulfide content q per ton of coal0＝0.005m3T, coal seam thickness Hc＝1.5m；
Calculating the single-hole injection quantity Q of water by a formulaw＝10.6t，
Qw＝ρcπr2HcK(ω1-ω0) ⑥
In the formula, the volume weight rho of the coal bedc＝1.4t/m3(ii) a The water injection uneven coefficient K is 1.5; water content omega of coal body after water injection11.6% of initial water content omega of coal body0＝0.7％；
And the rated pressure of a liquid injection pump in the system and the range of a pressure gauge are both set to be larger than the liquid injection pressure P0(value 1.5P)0) And the measuring range of the flowmeter is not less than the flow of the liquid injection pump;
the pressure-bearing capacity of the liquid injection pipe is larger than the liquid injection pressure P0(value 3P)0) The top of the liquid injection pipe is positioned at the pipe wall of the coal seam and is prefabricated with a plurality of sieve holes with the diameter of about 1cm, and the top of the liquid injection pipe is closed to ensure that the absorption liquid flows out along the coal seam surface and is injected into the coal seam.
7. The system firstly detects water leakage before being used, prepared absorption liquid is placed in a water tank of the system under the condition of no water leakage, a liquid injection pipe of the system is connected with liquid injection holes, liquid injection is sequentially carried out on the liquid injection holes, the arrangement condition between the system and a coal bed in the high-gas high-hydrogen-sulfide advanced treatment process is formed and is shown in figure 3, a section view and a three-dimensional view in the treatment process are shown in a and b in figure 4, and the high-gas high-hydrogen-sulfide advanced treatment in the coal tunnel construction period can be completed by closing a stop valve after the liquid injection is finished.
To sum up, the utility model discloses a high gas and high hydrogen sulfide advanced treatment system during coal tunnel construction period, which comprises a water tank, a liquid injection pump, a flowmeter, a pressure gauge, a stop valve and a liquid injection pipe which are connected in turn through a high-pressure pipe, and can inject absorption liquid into a coal bed in advance, so that hydrogen sulfide in the coal bed is neutralized with the absorption liquid on one hand, and the emission amount of hydrogen sulfide in the coal uncovering process of tunnel excavation is reduced; on the other hand, the liquid injection in the coal seam in advance can increase cracks in the coal seam, so that a gas circulation channel is provided for the advanced gas drainage of the coal seam, the gas drainage efficiency is improved, and the gas drainage time is saved. In addition the utility model also discloses a wear high gas hydrogen sulfide advanced treatment method of coal tunnel construction period, adopt the above-mentioned high gas hydrogen sulfide advanced treatment system of coal tunnel construction period of wearing, the arrangement mode of arranging interval design notes liquid hole and pre-drainage drilling hole in combining notes liquid hole quantity n and the coal seam that the calculation obtained, flowmeter in the reasonable system that sets up, manometer and the relevant parameter of annotating the liquid pipe, combine reasonable absorption liquid to constitute, can make things convenient for the high gas hydrogen sulfide advanced treatment of coal tunnel construction period of wearing by effectual completion, and easy operation, the effect is showing.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.
Claims (6)
1. The utility model provides a wear high gas high hydrogen sulfide advanced treatment system of coal tunnel construction period, its characterized in that, the system is including water tank (1), liquid filling pump (2), flowmeter (3), manometer (4), stop valve (5) and notes liquid pipe (6) that loop through high-pressure tube (7) and connect.
2. A system according to claim 1, characterized in that a safety valve (8) is arranged between the water tank and the infusion pump.
3. The system of claim 1, wherein the injection tube is mounted in an injection hole of the tunnel and is fed along the axis of the bore hole to the bottom of the hole.
4. The system of claim 1, wherein the pressure-bearing capacity of the injection tube is greater than the injection pressure during treatment.
5. The system of claim 4, wherein the pressure-bearing capacity of the liquid injection pipe is 3 times of the injection pressure.
6. The system as claimed in claim 1, wherein the top of the injection pipe is positioned in the tunnel, the pipe wall of the coal seam is prefabricated with a plurality of sieve holes with the diameter of about 1cm, and the top of the injection pipe is closed to ensure that the absorption liquid flows out along the coal seam and is injected into the coal seam.
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| CN112459829A (en) * | 2020-12-02 | 2021-03-09 | 青海省交通建设管理有限公司 | Advanced treatment system and method for high gas and high hydrogen sulfide in coal tunnel construction period |
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| CN112459829A (en) * | 2020-12-02 | 2021-03-09 | 青海省交通建设管理有限公司 | Advanced treatment system and method for high gas and high hydrogen sulfide in coal tunnel construction period |
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Inventor after: Zhang Xueqiang Inventor after: Wu Xiaoli Inventor after: Cai Shuang Inventor after: Ma Xiaojun Inventor after: Zhang Danfeng Inventor after: Guo Hai Inventor after: Deng Xin Inventor after: Cheng Liang Inventor after: Guo Hongyan Inventor after: Sun Xiaolei Inventor before: Zhang Xueqiang Inventor before: Wu Xiaoli Inventor before: Cai Shuang Inventor before: Ma Xiaojun Inventor before: Cheng Liang Inventor before: Guo Hai Inventor before: Deng Xin Inventor before: Zhang Danfeng Inventor before: Guo Hongyan Inventor before: Sun Xiaolei |