Study On The Explosion Resistance Of Dust Collector Based On Kunshan Accident

With the development of powder industry,the risk of dust explosion accident is increasing.8.2 Kunshan large dust explosion accident once again that prevent the severity of dust explosion.The starting point of the accident in Kunshan is the explosion of the dust collector,but our country does not have a non pressure container explosion related standard at present.This paper to Kunshan accident destroy dust collector for the breakthrough point of antiknock study on anti explosion duster evaluation and design has a certain reference value.First the explosion from the scene of the accident in Kunshan sampling of aluminum powder brisance test parameters,using the standard 20 1 spherical explosion vessel measured specimen of the maximum explosion pressure Pmax for 1.07 MPa,maximum pressure rise rate dp/dt for 91 MPa·s-1,the exponential explosion Kst for 25 MPa·m·s-1,polishing powder Biao Mingkun Hill accident St2 grade explosive strength of dust,that reveals the serious consequences of the cause of the accident.In this paper,the failure process of the dust remover in Kunshan is analyzed by numerical simulation.First established the FEM model of the accident precipitator,obtained by taking the maximum explosion pressure 1.07MPa for the load of calculate,found under the action of loading,precipitator location of most of the stress exceeds the fracture limit 380MPa,and maximum displacement is 26440mm.These showed that in addition to the tearing failure of dust collector,and the actual situation is consistent.Were studied further using the numerical simulation method of precipitator antiknock strength.The antiknock performance of the conventional 2-8mm thick dust collector were studied,the results showed that only 0.106MPa can resist the impact load.By increasing deduster wall thickness,take edges and corners circular arc transition,wall increased stiffeners and venting and other technical means of a dust remover of antiknock performance is optimized.Through the study found that simply increasing the wall thickness to 41mm to Kunshan aluminum dust explosion load impact resistance,increase the edges and corners circular arc transition thickness becomes 40mm,and increased stiffener only 20mm.Although increased significantly strengthen the tendons antiknock effect,but 20mm thick wall of dust collector is still the economy,this is the dust collector usually use venting technology,the study of Pred(venting chamber by venting the residual pressure)control values in the 0.1-0.5MPa dust collector of anti explosion performance.At the end of the different wall thickness of the dust remover of the antiknock performance,and the experience formula is obtained:(X represents deduster wall thickness,y on behalf of the anti explosion pressure).