Study On Theory And Technology Of Safety Prevention And Control Dust In Coal Bunker Of Coal Preparation Plant

Shenhua Coal Zhunge’er large annual production capacity of 24Mt. Due to the fragile nature of coal and non-hydrophilic, production technology and equipment process complexity and dust control equipment systems irrationality and other reasons, resulting in coal preparation plant and coal dust coal warehouse systems achieve high concentration 550 mg/m3, coal dust pollution is very serious. Therefore Coal Dust Prevention security theory and technology research is not only the average coal warehouse system has important practical significance to eliminate safety hazards, protect their health and to improve the production and management personnel to manage water preparation plant.Using experimental tests, theoretical analysis and numerical simulation methods to study the calculation method Zhunger Coal Dust dust links with the basic laws of motion; to determine the coal warehouse system for dust prevention research object, analyzes the coal preparation plant characteristics and coal dust coal warehouse distribution system; respectively based on coal warehouse roof loading point, warehouse roof off the coal process, under the feeding system in coal dust bin dust mechanism, research escaping the law, put forward the corresponding control technologies; reprint point to the warehouse roof chute, coal warehouse as an enclosed space to study dust explosion hazard and the risk of spontaneous combustion of coal.Dust concentration measurement and characterization results indicate that coal warehouse system:Front full control dust, respirable dust were exceeded 27.5,1.82-1.5 to 8.43 times the cumulative percentage of respirable dust is about 54 to 67 percent, the dust is oily dust.Use induction Merry, Merry and air blast Merry traction theory, studied the Jungar Coal dust coal warehouse system migration basic law. Phase were sparse and dense phase simulation method to establish the equations of motion of a typical gas-solid point spread of dust, dust production of basic equations and dust particles. The use of gas-solid flow theory and the air shock wave theory, chute length and installation position precipitators were calculated to determine and optimize the proposed use of coal warehouse top set between the nose compartment closed+dust cover+dust dry dust control technology combined with lower gross bunker feeder workshop tail no cover set chute+dry joint control dust precipitator technology.The establishment of a coal warehouse dust monitoring and automatic spray systems. First use of gas-solid flow, porous flow field and temperature field coupling theory medium for coal preparation plant coal warehouse chute, coal warehouse within an enclosed space dust explosion hazard and risk of spontaneous combustion were analyzed, the results show:within the chute, gross coal dust concentrations within the range of warehouse were about 993-1016 mg/m3,2000～4500 mg/m3, the lower the concentration of coal dust explosion can not reach 30000～50000 mg/m3, no explosion hazard. Risk analysis results show that spontaneous combustion of coal:coal bunker memory when height 18.56 m, while less memory bunker coal, wind speed appear spontaneous combustion of coal in the surface of the inner compartment, the possibility of spontaneous combustion of coal exist in the warehouse. Coal storage height of 25 m, while 45 m, there is no danger of spontaneous combustion. Proposed coal spontaneous combustion in the warehouse comprehensive preventive measures.