Abstract:

TThe phenomenon of shedshaped coal caking in raw coal bunker of Huadian Energy Mudanjiang Second Power Plant aggravates gradually for past few years. Aiming at this problem, the measures to solve the shedshaped coal caking in raw coal bunker in north cold area at winter were put forward. The material level sensors were redesigned and arranged to make them can monitor the material level in the coal bunker more accurately and to realize automatic alarm of high material level. The hydraulic control system and the coal loosening device were designed to make them can eliminate the shedshaped coal caking in the coal bunker dynamically at summer and suppress the frozen coal on the raw coal bunker wall at winter. The hightemperature and highpressure steam was used to cut the frozen coal, which can avoid the frozen coal to form large agglomerate. The PLC automatic control system was designed, by which the system can find and solve the problems itself automatically. So the safe and economic operation of the boiler was ensured.

Key words: raw coal bunker, unclog, shed-shaped coal caking, material level sensing, intelligent control