| 摘要 |
PURPOSE:To prevent dust sticking trouble in a flue, a heat exchanger and the other additional equipments, by a method wherein powdered aluminum hydroxide or aluminum oxide having rising effect of the melting point is sprayed on the high temperature part of the inside of a combustion furnace and a gaseous low-melting substrate is discharged outside of a furnace system as solid dust having the high-melting point. CONSTITUTION:Sludge containing a low-melting point substance is supplied within a combustion furnace 2 by a supply device 4 for combustion. Although burnt ashes are sent outside a furnace system along with exhaust gas and separated from the gas for removal by a succeeding cyclone 8, the low-melting point substance is turned into a gaseous state and a temperature of the gaseous substance is becoming low during a course of discharge along with exhaust gas. In this instance, the gaseous substance is condensed and sticked to a flue or additional equipments whose temperature is lower than the melting point of the same, which causes troubles such as clogging and corrosion. Thus, rise of the melting point is contrived by spraying Al(OH)3 or Al2O3 having rising effect of the melting point into a high temperature sphere in the combustion chamber as an additive, and deterioration of thermal recovery and corrosion of a tube through adherence of the gaseous substance to tube of a heat exchanger is prevented by discharging a low-melting point gaseous substance outside of the furnace system as solid dust. |
