瓦斯抽采管路变径长度优化研究

Research on optimization of variable diameter length of gas drainage pipeline

为解决在瓦斯抽采过程中流体流经突变截面时,流速的大小和方向均发生剧烈变化引起能量损失的问题,应用ANSYS中的Fluent模块,模拟研究了管道变径长度对管道内流体流速的影响,并提出一种确定最优变径长度的方法;进一步利用现场数据对模拟结果进行了检验.结果表明:管道变径时在突扩界面内流动发生明显的分离现象,出现回流区域;确定了426~630 mm、426~720 mm管道变径的最优变径长度分别为2.053 m和2.137 m.漳村煤矿2601工作面瓦斯抽采管路敷设应用结果表明,改进后426 mm^630 mm变径管道的负压损失率由26%降低至21.75%,426~720 mm变径管道的负压损失率由31.25%降低至24.50%.变径长度的合理选择有效解决了包括漳村矿在内的瓦斯抽采管路变径时局部能量损失过大和变径处耗损严重的问题.

In order to solve the problem of energy loss caused by the dramatic change of the flow velocity in the direction of the fluid flow through the abrupt section during the gas drainage process,the Fluent module in ANSYS was used to simulate the length of the pipe to the fluid velocity in the pipe.The method for determining the optimal variable diameter length is proposed and conducted on-site inspection.The results show that there is a clear separation phenomenon in the expansion interface of the pipeline when the diameter of the pipeline is variable,and the reflux area appears.The optimal diameter change length of the 426~630 mm and 426~720 mm pipes is 2.053 m and 2.137 m respectively.The application results of gas extraction pipeline laying on 2601 working face in Zhangcun coal mine show that the negative pressure loss rate of 426~630 mm diameter-changing pipeline is reduced from 26%to 21.75%,and that of 426~720 mm diameter-changing pipeline is reduced from 31.25%to 24.5%.The reasonable selection of variable diameter length effectively solved the problem of excessive energy loss and serious wear at the variable diameter of the gas drainage pipeline in Zhangcun Mine.