Cause analysis of exploision in coalpulverizing system with intermediate storage bunker of Minhang Power Plant has been carried out. It is considered that the main causes leading to said exploision are as follows: (1)selfignition of deposited coal dust of wornthrough place on inlet pipe of fine pulverized coal separator; (2)suddenly deacrease of air pressure at exit of the pulverized coal exhauster; (3)unsuitable regulation making air flow in the coalpulverizing system stagnated

and even to flow backwards. In this connection

after adopting corresponding measures of antiwear and exploisionproof

operation of the coalpulverizing system is good

and similar faults haven't occured again.