Abstract:

For the purpose of directional dust collection, improving sampling rate and reducing air pollution caused by dust during the hole drilling, computational fluid dynamics (CFD) technique is employed to investigate how the structure types of traditional orifice sealer, clapboard orifice sealer and streamline orifice sealer and their geometry parameters(clapboard location(L), outlet diameter(d) and outlet angle(θ) )influence the orifice seal effect. And optimal parameters are selected to carry out structure design of the sealer. According to the results, the seal effect of three types of sealer is obviously affected by their types and the outlet diameter(d). When d=40-160 mm, clapboard orifice sealer and streamline orifice sealer perform much better than the traditional sealer, and when d>160 mm, the performance of clapboard sealer becomes lower than the traditional sealer. However, the streamline orifice sealer always performs the best among the three of them. On-the-spot experiment shows that when using the orifice sealer, the effect of dedusting turns out to be satisfied and the average of sampling rate which can reach 97% is also acceptable.

Key words: orifice sealer, dedusting, CFD, sampling