Slagging problem in pulverized coal gasifiers!
Thread Content
In top-firing pulverized coal gasifiers such as GSP and HTL reactors, when the coal contains little ash, what is the condition of slag accumulation in the reactor? Is there a thin layer of slag evenly distributed inside the furnace, or is there slag only in the upper part while there is no slag in the lower part? ； Is slag still formed on the lower part, but not on the upper part? Why, what caused it?
Slag accumulation in the furnace is extremely important for furnaces with a water-cooled wall structure. Generally, in controlling the slag layer, it is necessary to maintain as much consistency as possible between the upper and lower layers, so as to avoid slag collapse as much as possible. The specific thickness of the slag layer basically depends on its thermal conductivity; therefore, from the perspective of operational control, it is related to the density of the water in the coil, and this has nothing to do with the amount of ash present. For top-firing furnaces, the slag accumulation in the middle and lower parts of the furnace depends mainly on the jet field determined by the swirl angle of the oxygen nozzles, while the slag accumulation in the upper part depends on the backflow field formed after the slag rebounds through the slag outlet. When the ash content is low and the temperature is kept high, a large amount of ash becomes molten in the jet field and is thrown to the middle and lower parts; with less ash in the backflow field, there is naturally less slag accumulation in the upper part of the furnace.