Research on Dust Concentration Changing Regularities in Coal Releasing Operation of Fully Mechanized Caving Faces and Dust Reduction Technology

摘要

Getting the changing law of dust concentration in fully mechanized coal caving face and taking specific measures can ensure the safety and health of workers. The dust migration rule of coal releasing process under different conditions was simulated by the software of FLUENT. The simulated result matches well with the related survey data. Considering the factors of velocity and mass flow quantity, the dust distribution function in the process of coal releasing was studied. According to the characteristics of the spray nozzle and the spray drop test, the nozzle is optimized. Combining the characteristics of dust generation in coal releasing and spray characteristics, based on the theory of negative pressure secondary dust suppression, the dust suppression device is developed and used in 3Top1110 coal mining face of Gao zhuang coal mine. Through the analysis of dust concentration changes after using the dust suppression device, the total dust and respirable dust removal rate was 79%～88%, and 56%～65% respectively. It is seen that the dust concentration of the working face was significantly decreased.