This is a dry burning phenomenon.
Usually in feeding mechanism of failure."That looks like a normal job, but actually because of the feeding mechanism
was stuck, or lower part of feeding mechanism is moist powdered coal block, coal have not for a long time, when I saw
the furnace the temperature rising, gas quality gradually decline, is actually a fire layer to elevate, finally caused
the upper coal loss reduction zone, etc.
Due to the center part of the coal seam is relatively thinner than marginal areas, so when there is no coal to join in
furnace, center part quickly finish coal gasification, the next is fire layer is exposed to direct combustion furnace
face, finally the central part of the coal is burned up, so in the state of the ash yellow-white.
This phenomenon often out at the time of blow-in, after a long-term boiler stop, pulverized coal and shimron, foreign
body into the coal in the furnace and without cleaning up again, so cause the upper feeding mechanism can't stuck
with the coal, the second is in the maintenance of stoker with up and down at one end and blind plate, and never to
smoke when blow-in blind plate, remain in place, cause can't coaling, found that firewood and quenching furnace. |