Combined with the Mecontrol Coal online wind powder measuring system developed by German PROMECON company

the principle of using electrostatic cross-correlation method and microwave method to measuring speed and mass flow of pulverized coal was presented.Moreover

the effect of such factors as particle size and measuring point position on the measurement precision was analyzed through experiment.Taking direct blowing system of the medium speed coal pulverizer of a 2×350MW unit W-flame boiler as the research object

the parameters of air and coal mixture were measured.By adjusting the opening degree of shrinkage hole on each primary air tube

the uniformity of air and coal mixture was balanced and the combustion was improved.After the opening degree regulation

if the mass flow deviation of pulverized coal is still large under uniform air volume condition

it suggests that the separator and distributor in coal mill should be checked

to improve the uniformity of coal before it enters each tube.