Effect on collection efficiency of three-dimensional concentration distribution in ESP

Abstract

The widely applied ESP efficiency formula of Deutsch had only taken the changing of dust concentration which following the direction of gas-flow into account, ignoring the other factors, resulting the calculated result of the Deutsch formula bigger than the actual one. In fact, the movements of dust particles in the ESP are very complex. there were three concentration grads in the dust removal area. Because of the mix and diffusion effect of the turbulence flow, the dust particles would transfer from high concentration place to the low one, and this turbulent confusion was obvious contrary to the dust collection process. In order to simplify the mathematical model, several assumptions were given regarded as the particle was collected. According to the assumptions, the three dimensional removal eciency formula can be obtained as η = 1-Kh exp(A/Q ω). Validated by experimental data in ESP test-bed, when Kh was in the range of 2-3, the calculated classification dust removal efficiencies were very closely consistent with the reality.