论文部分内容阅读
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 use of Y-type ventilation can solve the traditional U-shaped ventilation difficult to solve the upper corner and return airway gas concentration over-limit problem. In order to compare and analyze the gas migration and distribution rules of the U-shaped and Y-shaped ventilation gobs, the physical model of the U-shaped ventilation and the Y-shaped ventilation gob area were established. The Fluent software was used to detect the air leakage in the U-shaped and Y- Flow field, the amount of air leakage (along the boundary of the mined-out area wind speed distribution) and gas volume fraction distribution for numerical simulation. The results show that there is a great difference between the air leakage flow field and the U-shaped ventilation distribution in the gob of the Y-type ventilation working face. Y-type ventilation when the head face 0 ~ 30m, air leakage accounts for about 50% of the work surface air leakage, and the total air leakage than the U-type ventilation, to avoid the accumulation of high concentrations of methane in the goaf. Adopting two-in-one Y-type ventilation can fundamentally solve the problem of gas accumulation in upper corner and gas overrun in return airway.