外文翻译综采放顶煤瓦斯涌出的特点及防治.docx

1、外文翻译综采放顶煤瓦斯涌出的特点及防治外文翻译一综采放顶煤瓦斯涌 出的特点及防治中文2180字英文原文The Features and Prevention of the Gas Pouring from theBreaking Coal-bed of the Comprehensively MechanizedMining FaceZhao JunhuAbstract: Through analyzing the features of the gas-pouring from the comprehensively mechanized mining face, this paper ad

2、vances some methods for making comprehensive treatment of the gas to ensure the safety in the production.Key words:gas-pouring； comprehensively mechanized coal mining； coal mine safety.Caving in thick coal seam mining widely used in the mining method .After several years practice and the exploration

3、, applied this mining coal method to bring the remarkable economic efficiency.SImultaneously mines the technology also gradually to consummate, puts the coal thickness to reach 15 m.The peculiar circumstance has surpassed 20 in.Some syntheses set free a captured animal produce ability to achieve abo

4、ve 2,000,000 t/a. But along with the mining technology development and the application scope unceasing expansion, the synthesis picked puts goes against the coal also to bring a series of technical question under the specific conditionJf mines in the easy ignition high methane coal bed the fire prot

5、ection, dustproof, to guard against questions and so on gas.1synthesis lets loose picks the gas to gush out the characteristicsynthesis to let loose picks is different with other lamination mining, its working surface and the coal bed relative position has had the change, is along ledger wall mining

6、.The common around two conveyer transportation one time picks big, productivity is big, upside the broken pulverized coal body is mobile to the support window, is braved the roof to fall the function to put the coal to be non-uniform, facilitates the gas to gush out also non-uniform. Added the fire

7、protection note nitrogen influence, the cause synthesis lets loose picks the gas to gush out the question to appear the new characteristic became affects the working surface per unit area yield the important attribute, simultaneously gave the safety in production to bring the new question.Because th

8、e synthesis puts is along ledger wall mining, its gas originates is different with general lamination inining.General lamination mining is goes against mining along the roof or the vacation, the gas originates mainly is the coal body which the working surface coal wall and shears falls. The next lam

9、ination gas gushes out a quantity lamination to compare reduces 2-4 time.But the synthesis lets loose picks the gas to originate a minute two major part: A part comes from the working surface coal wall and picks falls the coal body, moreover the majority comes from the working surface support place

10、above.Indlcated according to the gas material.The coal wall and picks falls the coal body the gas to gush out the quantity only to account for 25 % .Other are above the support the coal body produces. When coal mining machine coal cutting the coal wall exposes unceasingly front, puts down work in ad

11、vance in the stress function is 10-15m stress Gao Zhiqu in the scope coal body crevasse to increase.The gas state of equilibrium receives the destruction, the coal body permeability increases, the gas inrushes along the release of pressure belt crevasse to the working surface.Moreover scatters the c

12、oal body Increased the gas to emit the speed to cause the gas quantity to increase, when the gas gushed out the quantity exposed along with the coal wall to ask the growth reduces. Above the support the coal body the coal cutting, moves, puts technological process and so on in coal pressure variatio

13、n influences, causes it to be destructed the massive adsorption gas transforms the dissociation gas, because its proportion is light.Creates picks the depletion region massive gas to accumulate (discharges working surface besides few parts from window).Moreover, braves in the horizontal included ang

14、le 60 scope to fall in the belt, because the roof braves to fall, the distortion causes the neighbouring area gas to gush out causes to pick the gas increase which the depletion region accumulates.2gas gush out in the time and the spatial particularity2.1let loose in the timeparticular synthesis pic

15、k the gas to gush out in the time are different with other method of exploitation, has its unique performance: First, when working surface coal cutting the gas releases a part.Second, the window puts when the coal the massive gas gush out.When third, the window puts at the same time the coal and the

16、 coal cutting the work, the gas gushes out massively.This is the gas agglomerates the most dangerous time.2.2gas spatial distribution characteristics see the chartlow gas area (I Area).This area ventilates good, the gas easy to discharge, the cross section is big, (support shield type support), the

17、amount of wind accounts for the total amount of wind 241%, the gas density is the low gas area.Gas increase area (HArea).This area is located entire chute and machine between.Because the cross section changes small, the amount of wind accounts for the total amount of wind 136%, the loose resistance

18、is big, was Inferior well ventilated I area is good, gas quantity increase.High gas area（mArea）.This area for behind chute space, because the chute kept off the coal board to occupy certain space, put when the coal put down the coal has occupied certain space, created the cross section to be small,

19、the resistance was big.The amount of wind accounts for the total quantity 8%10%, also this area is apart from the hard gang to be far, creates ventilates the difficulty, like this puts when the coal the gas gushes out massively forms the high gas area, namely gas warning area.Gas agglomeration area.

20、Thls area is located puts above the coal window, the massive gas cannot discharge, forms the gas agglomeration area, also is the warning area.3syntheses let loose pick the gas explosion factor3.1gas distributionfollowing chart to show, the entire working surface besides puts the coal mouth, the gas

21、discharges basically under the normal loose dilution, its gas quantity does not surpass l%.But on puts the coal mouth, puts above the coal mouth to pick lower part on the depletion region, the air return way the solid angle goes against high, these place gas volume score is 3% 15%, basically in deto

22、nation boundary （5%一16%）, And has ventilates for the oxygen condition, has exterior fire hazard possibly to cause explodes.Distributes in picks on the depletion region the massive gas agglomeration not to be able to discharge, the volume score surpasses 20%.In order to prevent the coal bed spontaneo

23、us combustion ignition, the synthesis lets loose picks to picks the depletion region note nitrogen to reduce the oxygen content is one kind of effective fire precautions, but because the note nitrogen causes the gas to assume the barotropic state, the force picks the depletion region a part of gas o

24、utflow, also creates the gas to gush out the quantity to Increase.3.2caused the gas explosion detachment conditionto have the gas accumulation, its density achieved the detonation boundary, had under the external factor fire hazard condition then to have the gas explosion again.From actual situation

25、 analysis. Causes the gas explosion condition to include: The electricity does not guard against explosions produces the spark to cause the gas explosion - Picks the depletion region ignition associated gas explosion； The bulk rock braves to fall produces the spark with the support collision to caus

26、e the detonation； Puts the coal window to fire a gun processes the big lump coal body to be possible to cause the detonation； The coal body high-temperature oxidation causes the detonation； Moves a time support to rub easily to cause the gas explosion.4syntheses let loose the gas which picks to prev

27、ent and control4J to pull out put primarily effect a permanent cure the measureregarding the gas content big coal bed, adopts the method which extracts the gas to enable the gas density to achieve the mining request, extracts the means to have in advance pulls out ahead of time with picks while pull

28、s out two kinds.4.21s after first upscale and the synthesis picks the synthesis to let loose picksAfter pulls out puts could not achieve the mining request the coal bed, must first pick or the upscale method along the roof with the synthesis mines 23, carries on the synthesis after the mining libera

29、tion level release gas to put again.4.3delivers the roof gas lane or the special gas tail lanein picks behind the depletion region to dig the special gas tail lane. Behind working surface advance mining coal pulls out a row of gas, like this picks the depletion region gas to discharge by the behind

30、tail lane, or digs along the roof delivers the gas lane, each 50m digs delivers the rill and the air return way is interlinked the release gas.4.4high-pressure waterflood conditioning coal bed emissions gascarries on the high-pressure waterflood in the coal bed, not only can soften the coal body, re

31、duce the dust, moreover can discharge the coal bed Jointing crevasse in partial gas, reduces the coal dust gas content, simultaneously plays the temperature decrease, increases the humidity the role, not easy to cause the ignition, may prevent the gas accident.4.5adjusts the gas from the operation c

32、raft to gush out the quantitycontrol to put the coal mouth to put the coal, does not cause to put the coal amount oversized, one time puts the coal time not to want to grow, divides puts many times, has the limit control gas to gush out the quantity.The coal cutting puts the coal not to have simulta

33、neously the work, prevented the gas superimposition gushes out.Cleans up behind between the chute rack to float the coal, increases the cross section, reduces the resistance, guarantees loosely unimpeded.Special place (for example on solid angle) available bureau fan emissions gas. May adopt lamination mining regarding