Numerical Simulation And Experimental Study On Coal Gas Explosion Venting Device

Combustible gas explosion in dust remover has occurred frequently in thepurification process. As the conventional protection measure, explosion venting deviceinstalled on the dust remover can relieve the increased pressure caused by explosionthrough the fixed openings in time. This measure can guarantee relatively low pressure inthe dust remover, protecting the dust remover shell from the significant deformation andthe workers from being injured.The explosion venting device that is designed empirically with the considerable errorcannot meet the industrial demand. In view of this practical situation, a method regardingthe design of the explosion venting device was provided with the application of thenumerical simulation and experimental study.According to the mechanism of combustible gas explosion, the related parameterswith respect to the explosion degree were obtained when blast furnace gas explodedlocally. Based on these parameters, the explosion venting area is figured out, providing thetheoretical support for the design of explosion venting device.Taking explosion venting device with three-level spring for example, this paperdesigned the performance parameters of the spring at each level. Through building3-dmode, the finite element software ANSYS was employed to conduct the static andtransient analysis of each level and explosion venting device. The result of the finiteelement analysis is very close to the theoretical value, with the average error of3%.According to the graph of the explosion venting time and load, explosion venting valvecan be opened fully in500ms, which meet the requirement of explosion venting time.The experimental study of the static rigidity was performed for the spring at eachlevel. The accuracy of spring rigidity via numerical simulation is then confirmed. Theoperation time and the height are measured in the process of the venting. This willadminister to the evaluation of the operative performance of the explosion venting device.The venting flow rates for such two venting paths as DN500and DN800in variousflammable pressures are obtained.On the basis of the aforementioned investigation, the explosion venting device system with the wide application, the convenient operation and high precision isestablished. Furthermore, the production with no drawing is achieved in the whole processand the efficiency and the design accuracy are then improved.