1、中文 2180 字 英文原文 The Features and Prevention of the Gas Pouring from the BreakingCoal-bed of the Comprehensively Mechanized Mining Face Zhao Junhu Abstract:Through analyzing the features of the gas-pouring from the comprehensively mechanized mining face， thispaper advances some methods for making comp
2、rehensive 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, applied this mining coal method
3、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 m.Some syntheses set free a captured animal produce ability to achieve above 2,000,000 t/a. But along with th
4、e 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 condition.If mines in the easy ignition high methane coal bed the fire protection, dustproof, to guard agains
5、t questions and so on gas. 1 synthesis lets loose picks the gas to gush out the characteristic synthesis 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.The common around two conveyer
6、 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 protection note nitrogen influ
7、ence, 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 the synthesis puts is along led
8、ger wall mining, its gas originates is different with general lamination mining.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 lamination gas gushes out a quant
9、ity 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 above.Indicated according to t
10、he 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 advance in the stress function is
11、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 coal body increased the gas to em
12、it 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 variation influences, causes it to be de
13、structed, 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 angle 60 scope to fall in the belt
14、, 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. 2 gas gush out in the time and the spatial particularity 2.1 let loose in the time particular synthesis pick the gas to gush out in t
15、he 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 coal cutting the work, th
16、e gas gushes out massively.This is the gas agglomerates the most dangerous time. 2.2 gas spatial distribution characteristics see the chart low gas area (I Area).This area ventilates good, the gas easy to discharge, the cross section is big, (support shield type support), the amount of wind accounts
17、 for the total amount of wind 241%, the gas density is the low gas area. Gas increase area ( Area).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 is big, was inferior w
18、ell ventilated I area is good, gas quantity increase. High gas area ( Area).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, the resistance was b
19、ig.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.This area is locat
20、ed puts above the coal window, the massive gas cannot discharge, forms the gas agglomeration area, also is the warning area. 3 syntheses let loose pick the gas explosion factor 3.1 gas distribution following chart to show, the entire working surface besides puts the coal mouth, the gas discharges ba
21、sically under the normal loose dilution, its gas quantity does not surpass 1%.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 一 15 , basically in detonation bound
22、ary (5 一 l6 ), 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 spontaneous combusti
23、on 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 outflow, als
24、o creates the gas to gush out the quantity to increase. 3.2 caused the gas explosion detachment condition to 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 analysi
25、s. 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 cause the det
26、onation； 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. 4 syntheses let loose the gas which picks to prevent and
27、 control 4.1 to pull out put primarily effect a permanent cure the measure regarding 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 pulls ou
28、t two kinds. 4.2Is after first upscale and the synthesis picks the synthesis to let loose picks After 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 2-3, carries on the synthesis after the mining liberation level release gas to put again.
