The principle of light fluctuation is presented. Based on this method, a novel system for on-line real time measuring pulverized coal was developed by authors. This system may be used in both the direct firing pulverizing system and the indirect firing pulverizing system. The results of over-one-year monitoring in a 300 MW utility boiler and many measurements in utility boilers with the capacities from 300MW to 600 MW show that the system can reliably measure particle size, concentration and velocity of pulverized coal.

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