摘要
运用Y型通风方式可解决传统U型通风难以解决的上隅角和回风巷瓦斯浓度超限问题。为了对比分析U型和Y型通风采空区瓦斯运移及分布规律,建立了U型通风和Y型通风采空区物理模型,运用Fluent软件对U型通风和Y型通风方式采空区漏风流场、漏风量(沿采空区边界风速分布)和瓦斯体积分数分布进行数值模拟。结果表明,Y型通风回采工作面采空区漏风流场与U型通风分布有较大差别。Y型通风时工作面端头0～30 m时漏风约占工作面漏风量的50%,且总漏风量较U型通风时多,可避免采空区高浓度瓦斯积聚。采用两进一回Y型通风可从根本上解决上隅角瓦斯积聚和回风巷瓦斯超限问题。
The article is mainly concerned about the gas distribution in gobs of U-type and Y-type ventilation mining working faces. So far as we know, the application of Y-type ventilation method can solve problems that U-type ventilation method can not do, for example, the disallowed gas concentration in the upper corner and return airway. In order to make a comparative analysis of gas migration and distribution regularity in the gobs by using the both ventilation methods, we have established physical models of the gobs by using both the U-type and Y-type ventilation manners and prepared a numerical simulation model in the air leakage flow field so as to look into the leakage situation （wind speed distribution along the border of the gobs） more profoundly and the gas concentration distribution in the gobs by using both U-type and Y-type ventilation via the fluent. The results of our study show that the air leakage flowing situation at the working face in the gob with Y-type ventilation is quite different from that with U-type. To be exact, with Y-type ventilation, most of gas can be carried out to the gob through the side entry retaining, only a small part of gas, that is, 0.5%, can be carried out to the upper corner of the working face. It can also be found that in case of Y-type ventilation, there is only about 50% of leakage getting out at the end of 0-30 m in the front of the working face, whereas in 30-90 m at the end of working face the leakage parentage can only be about 46%. Moreover, the greater the distance of the deep gob side from the entry retaining, the less amount the air leakage can get out from the gob. But it is obvious that if the total leakage is greater than that which can be done through the U-type ventilation, it would be possible for the high-concentration gas accumulation in the gob to be avoided. Therefore, it can be concluded that by using ＂two intakes and one return,＂ the Y-type ventilation can be expected to solve the problems of gas accumulation in the upper corner and therefore disallow the gas concentration return to the airway basically.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2012年第5期227-230,共4页
Journal of Safety and Environment
基金
国家自然科学基金项目(51174079)
高等学校博士学科点博导类专项科研基金项目(20104116110001)
河南省瓦斯地质与瓦斯治理重点实验室--省部共建国家重点实验室培育基地开放基金项目(2012W06)
关键词
矿山安全
采空区
U型通风
Y型通风
漏风
瓦斯
数值模拟
mine safety
gob
U-type ventilation
Y-type ventila-tion
air leakage
gas
numerical simulation
