Research progress and prospect of dust control theory and technology in China’s coal mines in the past 20 years

In recent years， with the increasing level of mechanization， automation and intelligence in mining， dust pollution in the working environment is becoming more and more serious.In order to further improve the clean production level of coal mines， promote the safety guarantee ability and occupational health level of coal mines， this paper analyzes the research status of dust control in China， summarizes the achievements of dust control theory and technology in the past 20 years， and puts forward the future development direction.In this paper， the existing basic theories of dust control are expounded， including dust dispersion pollution law， dust micro wetting theory， dust condensation and wet dedusting theory， wet shotcrete dedusting theory.Based on the above theory， domestic universities and scientific research institutes have developed dust control and dedusting technology of different dust sources， such as local atomization closure and air curtain isolation of comprehensive mining face， wind fog double curtain synergistic effect of comprehensive mining face， coal seam water injection strong infiltration and moistening， mine wet (tide) spray operation system， high-efficiency environmental protection dust suppressor， etc.At the same time， in view of the shortcomings of the existing research， the next research prospects are given in four aspects:intelligent dust prevention， coal seam water injection dust reduction， mining environment dust reduction， dust suppression materials.Research and practice show that China’s coal mines have initially formed a theoretical and technical system of dust prevention and control.In the future， it is necessary to take intelligent dust prevention as a starting point， realize high-precision dust sensing transmission evaluation and early warning， and develop a combined dust remover integrating atomization， dry-type， dry wet mixed type， miniaturization and large air suction， At the same time， the technology and equipment system of high-efficiency ventilation and dust control of fine dust in wide area complex space such as comprehensive mining face and comprehensive mining face are realized.At the same time， the technology and equipment system of hydraulic strong permeability and moistening technology in low permeability coal seam of mine， intelligent shotcrete dust-proof robot and dust suppression material are also achieved.In this way， the mine dust can be effectively controlled by different sources， and the cleaner production level of the mine can be improved.