Approach to moisture content in pulverized coal and pulverizer style selection for lignite utility boilers

Based on the impingement abrasion index and the external moisture content of lignite,the medium-speed pulverizer or fan mill pulverizing systems were usually selected in the lignite utility boilers in China.By researching on the selection method of lignite utility boilers pulverizing systems overseas,coal particle size,drying time,drying temperature and drying humidity was suggested to be concerned when determining the external moisture content of lignite.Also the total moisture content Mt could be references for selection of pulverized preparation system in lignite utility boilers.And the selection for the moisture content of coal will affect the operation of the pulverizing system greatly.Comparing the results calculated by these different methods with the actually measured data,the way to select moisture content in pulverized coal was proposed.