本文選題：下分層　切入點(diǎn)：綜放工作面　出處：《西安科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：煤炭自燃是我國煤礦重要災(zāi)害,不僅造成大量的資源損失,還嚴(yán)重威脅煤礦的安全生產(chǎn)。而煤礦開采方式是影響煤炭自燃的主要因素之一,其中在特厚煤層分層開采時,下分層重新揭露煤體受漏風(fēng)影響會造成上分層遺煤再次氧化升溫,使下分層開采時煤自燃危險性增大。當(dāng)采用綜放開采時,兩巷頂煤放出率較低,采空區(qū)兩道留有較大遺煤量,是煤自燃的多發(fā)地。王洼二礦5#特厚煤層03區(qū)段采用分層開采,上分層綜采,下分層綜放開采。下分層綜放回采時,采空區(qū)與上分層采空區(qū)呈現(xiàn)相互連通,巷道頂板出現(xiàn)多處破碎帶與上分層采空區(qū)貫通,致使預(yù)氧化的上分層浮煤發(fā)生再次氧化,煤自然發(fā)火概率增大。下分層采用綜放工藝時,兩道數(shù)米范圍內(nèi)頂煤放出率較低,留有大量遺煤,易發(fā)生煤自燃。因此,研究王洼二礦下分層綜放開采時煤自燃特性及防治技術(shù)尤為重要。本文以王洼二礦下分層115032綜放面為研究對象。首先,結(jié)合理論分析了下分層115032綜放開采時煤自燃特點(diǎn)。其次,應(yīng)用工業(yè)分析、表面結(jié)構(gòu)分析、程序升溫實(shí)驗(yàn)與大型煤自然發(fā)火實(shí)驗(yàn)對下分層115032綜放面的混合煤樣進(jìn)行實(shí)驗(yàn),得出煤樣的揮發(fā)分、比表面積及微孔和中孔比例都較大,臨界溫度為50～60℃,干裂溫度為110～120℃,C2H4出現(xiàn)煤溫為70～90℃,C2H6出現(xiàn)溫度為80～90℃,自然發(fā)火期為22天。再次,通過現(xiàn)場實(shí)測下分層115032綜放面和215021綜放面采空區(qū)浮煤厚度、氧氣濃度和漏風(fēng)強(qiáng)度的分布情況,結(jié)合實(shí)驗(yàn)所得煤自燃極限參數(shù),得出下分層115032綜放面采空區(qū)氧化升溫帶大于215021綜放面采空區(qū)氧化升溫帶,且更接近工作面,窒息帶深度相差不大。最后,根據(jù)實(shí)驗(yàn)和下分層115032綜放面采空區(qū)煤自燃危險區(qū)域,應(yīng)用注氮、注漿和高分子膠體的綜合防滅火技術(shù)對巷道破碎頂板處與開切眼處煤自燃隱患進(jìn)行治理,對回采、臨時停采和回收期間煤自燃進(jìn)行預(yù)防,實(shí)踐證明綜合防滅火技術(shù)對下分層115032綜放面煤自燃防治起到了良好效果。文中的研究結(jié)果對相似本工作面的煤自燃防治提供了理論、實(shí)驗(yàn)和技術(shù)借鑒。
[Abstract]:Coal spontaneous combustion is an important disaster of coal mine in China, which not only causes a lot of loss of resources, but also seriously threatens the safety of coal production. Coal mining mode is one of the main factors affecting coal spontaneous combustion. The reexposure of coal body under the influence of air leakage in the lower stratification will result in the reoxidation and heating of the upper stratified coal, which will increase the danger of spontaneous combustion of coal in the next stratified mining. When fully mechanized caving mining is adopted, the caving rate of the top coal in the two roadways is lower, and the coal left in the two goaf is larger than that in the goaf. Wwangwa No.2 Coal Mine adopts stratified mining, upper stratified fully mechanized mining, lower stratified fully mechanized caving mining. When fully mechanized caving mining in lower stratification, goaf and upper stratified goaf are connected with each other. There are many broken zones in the roof of the roadway and the goaf of the upper layer, which leads to the re-oxidation of the upper stratified floating coal, which increases the spontaneous combustion probability of the coal. When the fully mechanized caving process is adopted in the lower layer, the caving rate of the top coal in the range of two meters is low. A large amount of residual coal is left, which is prone to spontaneous combustion of coal. Therefore, it is particularly important to study the characteristics of coal spontaneous combustion and the prevention and control technology in fully mechanized coal caving mining. This paper takes 115032 fully mechanized top-coal caving face under Wangwa No. 2 Mine as the research object. Combined with the theory, the characteristics of coal spontaneous combustion in 115032 fully mechanized caving mining are analyzed. Secondly, the mixed coal samples of 115032 fully mechanized caving face are tested by industrial analysis, surface structure analysis, temperature-programmed test and large coal spontaneous combustion test. The results show that the volatile matter, specific surface area and the ratio of micropore to mesopore of coal sample are large, the critical temperature is 50 ~ 60 鈩，

本文編號：1635008