Patent ID: 6074620
Filing Date: 2000-06-13
Classification: B01D,B01J

Abstract:
In a method of cleaning industrial combustion exhaust gas utilizing activated coke, the activated coke being capable of exploding upon the industrial combustion exhaust gas and the activated coke being mixed together; the activated coke having a grain size distribution including a portion of coarse grains and a portion of fine grains; the grains of the activated coke being entrainable in the flow of industrial exhaust gas; the method including: selecting at least one explosion suppressive material having a grain size distribution including a portion of coarse grains and a portion of fine grains; the grains of the at least one explosion suppressive material being entrainable in the flow of industrial combustion exhaust gas; mixing the activated coke and the at least one explosion suppressive material and thus forming a mixed powder; providing a sufficient amount of the activated coke in the mixed powder to remove a majority of the impurities in the industrial combustion exhaust gas; dispersing the mixed powder into a moving stream of industrial combustion exhaust gas and entraining the mixed powder in the moving stream of industrial combustion exhaust gas, the improvement comprising:selecting the grain size distribution of said at least one explosion suppressive material to match the grain size distribution of the activated coke such that upon the activated coke and the at least one explosion suppressive material being dispersed in a gas medium, the coarse grains of the at least one explosion suppressive material have a speed of vertical descent which matches the speed of vertical descent of the coarse grains of the activated coke;the mixed powder having a concentration of carbon up to about 40% and also being able to suppress explosions of the mixture of the industrial combustion gas and the activated coke; andcleaning the industrial combustion gas by adsorption of portions of the industrial combustion gas with the mixed powder while suppressing explosions of the mixture of the industrial combustion exhaust gas and the activated coke with the at least one explosion suppressive material.