What is the phenomenon of clogging of fine powder separator in pulverized coal boiler and how to deal with it?

When the fine powder separator is clogged, in addition to the abnormal parameters of the pulverizing system itself, the increase in the amount of pulverized coal in the outlet exhaust gas will also affect the boiler operating parameters, so the following phenomena occur.: (1) The negative pressure at the inlet of the fine powder separator decreases and the negative pressure at the outlet increases. ； (2) The negative pressure at the inlet of the powder discharge machine increases, the current increases and swings ； (3) Boiler evaporation increases, steam pressure and steam temperature rise ； (4) The air lock at the lower part of the fine powder separator does not operate or may not operate properly. If it is an electric rotary air lock, its current swing will be large. deal with: (1) If it is a hot air powder feeding and milling system, you can stop the powder discharger immediately, which means stopping the operation of the milling system. ； (2) If it is a exhaust gas pulverizing system, the coal feeder and coal mill should be stopped, the air path should be switched, and the primary air pressure should be maintained. ； (3) Pull out the pulverized coal screen under the fine powder separator and clean the debris and accumulated powder on the screen. ； (4) Movable air lock to clear the powder pipe ； (5) If the blockage is caused by the full pulverized coal bin, the screw powder conveyor should be started to deliver powder to the adjacent furnace.

The phenomenon of clogging of the fine powder separator: 1. The negative pressure of each part in front of the inlet of the fine powder separator decreases, and the negative pressure of the outlet increases. 2. As the current of the powder discharge machine increases, the evaporation volume of the boiler increases, and the steam temperature and steam pressure increase. 3. The air lock operates abnormally or does not operate. 4. The powder level in the powder bin drops, the boiler combustion is unstable, and the safety valve operates when the blockage is serious. Treatment of clogged fine powder separator: 1. According to the rising steam pressure, the boiler will immediately notify some burners, and if necessary, can open the exhaust to the air, and strengthen the monitoring and adjustment of water level and steam temperature. 2. The first deputy stoker should immediately stop the side coal feeder, coal grinder and pulverizer. 3. Knock the lower powder pipe, move the air lock, clear the debris and accumulated powder on the small brush, clear the lower powder pipe, and check whether the lower powder baffle of the fine powder separator is correct.