Theoretical framework and key technologies of underground ecological protection based on coal mine occupational health prevention

Occupational health is the focus of the development of human society.The dust,exhaust gas and noise resulted from coal mining activities have worsen the underground ecological environment.Due to the confined underground space,it is difficult to dilute the polluted air to meet the standards of clean air only by mine ventilation,inevitably causing various degrees of impact to worker health and even leading to pneumoconiosis.Considering the difficulty in the prevention and control of pneumoconiosis in coal mine production process and the large number of employees,the current situation of pneumoconiosis control was analyzed in China.Based on the pathogenesis of pneumoconiosis in coal mine,the dust generation mechanism,diffusion law,the environment of underground personnel work and equipment operation were studied systematically.The concept and implication of underground ecology were explained.The systemic protection concept of dust reduction at the source of excavation,dust control in the process of transmission and effective protection of personnel were proposed.The technical system of coal mine occupational health protection was established,which combines the underground ecological protection with coal mine planning layout and mining technology optimization of dust reduction at the source and uses highly reliability,lightweight and intelligent personal protective equipment (PPE).A key technology system for ecological protection in underground coal mines is proposed.And the key technology system includes coal mining layout technology based on source dust reduction and dust reduction,coal seam high efficiency water injection and moisturization technology,high efficiency environmental protection dust suppressant technology,dry highefficiency filter and dust removal technology,hydraulic support Partially airtight dust isolation technology between racks,coal shearer dust source automatic tracking spray dust reduction technology,efficient collection technology for difficult to sealed dust sources,gas liquid linkage suction spray dust reduction technology for comprehensive road headers.The research work provides a new method to reduce coal dust exposure and improves the working environment in coal mines.