What are the possible solutions for slagging?
Based on the different methods involved in ash deposit over the heating surface, two types of ash deposition are observed, i.e. slagging and the fouling. Boiler slagging and fouling are two main factors that adversely affect the efficiency of boilers.
The process of slagging cannot be prevented completely. It can, however, be reduced using several ways such as ensuring even distribution of heat to avoid localized temperatures. It can also be minimized by adding a conditioner to the molten ash particles carried by the flue gas which is taken up by those molten particles and produces a nucleating effect when those particles cool, causing them to solidify more rapidly, thereby preventing deposit formation or resulting in considerably more amounts of friable deposits. Formation of deposits on the convention surface can be reduced by keeping appropriate temperature at the exit of the furnace and also by removing sufficient amount of heat. Apart from the above stated solutions, height, width and depth ratio of the furnace should be proportional so that potential of ash particles impacting on the furnace surface is limited.
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