Application of fan frequency conversion technology for energy saving in cement plants

In order to solve the problem of high energy consumption of fan in cement industry, the frequency conversion technology was used to recast the traditional working model of fluid coupling driving and entrance wind-door adjustment. The power difference of air valve adjustment and wind speed adjustment was analyzed to find that the change of frequency can cause the large diversification of axis power. For illustration, a low-voltage coal mill example is utilized to show the feasibility of frequency conversion technology in solving problem of energy saving. Empirical results show that by changing the frequency, the electricity saving ratio of five kinds of fans (High voltage high temperature fan, High voltage raw material mill fan, High voltage cement mill fan I, High voltage cement mill fan II and Low voltage pulverized coal exhauster) reached to 10.7%, 16.0%, 77.5%, 77.4% and 37%. The confidence-measure-based frequency conversion technology can effectively solve the problem of high energy consumption by deducing the wastage of axis power.