MOVEMENT LAWS OF HYDROGEN SULFIDE AND ITS PREVENTION AND CONTROL TECHNOLOGY IN FULLY MECHANIZED HEADING FACE FROM THE PERSPECTIVE OF ENVIRONMENT PROTECTION

摘要

The movement laws of hydrogen sulfide in fully mechanized face are of great importance of ecological environment protection in high-sulfur coal mines. In order to understand the movement laws of hydrogen sulfide in fully mechanized face, a mathematical model of movement laws was built based on the turbulent k-eequation and the dynamic dispersion equation. The process of hydrogen sulfide migration and diffusion was simulated, and a comprehensive control method combining foam absorption technology with water curtain purification technology was put forward. The results showed that the migration process of hydrogen sulfide under the influence of flow field and gravity can be roughly divided into three stages, which were gravity diffusion, passive diffusion and uniform expansion. Under the similar "U" ventilation system in the working face, hydrogen sulfide is most likely to accumulate in the lower corner of the return air side. After the application of comprehensive control measures, the volume fraction of hydrogen sulfide emitted by road header cutting coal decreased from 47.7X10"6 to 6.0x10-6, and the effective removal rate of hydrogen sulfide was as high as 83.8%.