Study On Technology Of Methane Elimination With HPQSJF At Upper Coign Corner

At the present time, it is common to see that methane density at upper coign corner of work face underground exceeds the permissive density limit greatly in our country, which threatens the safe status in coal mine industry. The thesis puts emphasis on the shortage of the present technology used in eliminating methane at upper coign corner, and does research on high-pressure quadric swirling jet fan (HPQSJF). HPQSJF is used to eliminate the methane accumulated at upper coign corner with a wider range and no fire.The main aim of this research is to ensure the optimum size of every part of HPQSJF. It includes the systemic research on the influence that different type of nozzle, different size of throat pipe, different size of diffuse pipe and other key parameters put on flow amount, flow pressure and operation range, the numerical simulation research of flow field of HPQSJF and research in advanced HPQSJF which has larger effective range, larger suction amount, smaller water consumption and perfect effect in eliminating explosive gas. It also does applicable experimental research in practice on the effect of eliminating accumulated explosive gas at upper coign corner of work face underground.The methods used in this thesis include lab experiment, numerical simulation experiment and industrial experiment in practice. Experiment on different types of swirl, different sizes of nozzle, making of pipes with different length, foundation of experimental and testing system, measuration and analysis of experiment data and so on. Research on theoretical analysis of experiment data is to calculate and coordinate experiment data through vertical method in order to ensure the best experiment scheme and ascertain the optimum structural sizes of HPQSJF. It also finds out the widest effective range and the most intense mix capacity of swirling jet by measuration of the flow field at the outlet of fan. The result of numerical simulation indicates that HPQSJF alters the distribution of flow field at coign corner markedly, eliminates the accumulated methane effectively and improves the safety status in mine industry. HPQSJF resolves the problem of methane accumulation at upper coign corner effectively when it is applied in practice. The result of industrial experiment proves HPQSJF to be worthy of economy and society.In a word, the results that come from numerical experiment or industrial experiment indicate that it is safe and efficient to eliminate methane accumulated at upper coign corner by using HPQSJF.