Study On Ventilation Dusting System Of Car Dumper

Car dumper system, a very specialized complete set of equipments, is used to handle bulk materials from trains. With the development of enterprise scale and modernizes degree, more and more industrial fields are concerning the use of car dumper. However, in the process of car dumper unloading bulk materials, due to large gap, the huge volume and source of dust more are causing dust explosion. The result leads to the dumper chamber badly polluted air and affects the health of workers.Ventilation dusting system is one of the basic measures to do prevent and control dust. Setting the local gas-collecting hood in dust space, through the reasonable airflow organization with pest control is important means of industrial fly. Studying on the gas-collecting hood face airflow distribution rules for effective dust trapping is very important. Understanding the motion law of air-flow in the suction and the puff port is the fundamental basis for the reasonable design of the gas-collecting hood and the ventilation dusting.In this paper, the physical model were established with logical suppose and simplification based on the unloading process of C type car dumper. The simulation study of dust raising characteristics was implemented and analyzed according to two different hoppers. Optimization of airflow distribution was studied by combining the method ANSYS 14.5. RNG k-e model and Lagrange discrete phase model were used in the turbulence model and the two-phase model, of which the reliability was validated by the experiment. Here the flow field characteristics were analyzed and summarize. Ultimately, the symmetrical hopper structure is better, and the dust velocity from the bottom of hopper is about 1.5m/s ~ 4.5m/s.For the intermittent characteristic of the unload material, the modeling process of the simulation was divided into two stages. According to the characters of induces airflow wary from the two stages, the dust-collecting strategy of both sides suction airflow and the control strategy of push-pull airflow are simulated. Because the characters of induced airflow vary from the spot of gas-collecting hood and velocity, we determined the optimal position and velocity. Compared of two strategies for air volume required and the effect of dust control, the push-pull structure was optimal, and the hoods were set on the hopper. We got the results: the best blowing air flowing velocity is 4m/s, the aspiration air flowing velocity is 5m/s. In this case, the expected effects were achieved, which provides basis for airflow distribution design of dust source system is simpler and smaller initial investment.Based on the similarity principle, the coal pit was narrowed by 1:16. The dust concentration of three dust-removal schemes, which were unilateral suction, both sides suction and push-pull, was determinate in the same air volume. Experimental results show that the dust removal efficiency is better when the blowing air flowing velocity is lower than the aspiration air flowing velocity blowing. The blowing air flow can dilute dust and expand the scope of trapping dust. When the required air volume is same, dust removal effect of both sides suction and push-pull dust removal scheme are significantly better than unilateral suction. The dust concentration of both sides suction is closed to push-pull dust removal scheme. Experimental results coincide with the simulation results.