Catalytic co-combustion of soot and hydrogen in fluidized bed
The relevance of the research is caused by the need to neutralize the emissions of soot and hydrogen from furnaces for sorbents carbon coating, which are mainly burned in the fire mode. This leads to formation of thermal nitrogen oxides and does not provide complete combustion of soot. The aim of the research is to determine the optimum conditions of co-combustion of the butadiene pyrolysis products in the fluidized bed of deep oxidation catalyst of real emissions of soot and hydrogen mixture from the furnace for sorbents carbon coating. Objects: real emissions of a mixture of soot and hydrogen from the furnace for sorbents carbon coating. Methods: chromatographic analysis of flue gases from the reactor with a fluidized layer of the catalyst after combustion of the mixture of soot and hydrogen, photocolorimetric gas analysis on the content of nitrogen oxides using Griess-Ilosvay reagent, gravimetric method for determining soot emissions. The specific surface area of soot was determined on the basis of low-temperature nitrogen adsorption isotherm data. Result. The authors have determined the optimum conditions of co-combustion of butadiene pyrolysis products in the fluidized bed of deep oxidation catalyst of real emissions of the mixture of soot and hydrogen from the furnace for sorbents carbon coating. It is shown that during the catalytic co-combustion of soot and hydrogen in the fluidized bed of the industrial catalyst IC-12-70 almost complete combustion of hydrogen occurs at a 550 °C, and the degree of carbon burn-off in the form of soot reaches a value of not less than 99,9 %. Emissions of harmful substances are insignificant: NOx is not more than 4,5 mg/m3, CO is not more than 0,037 vol. %.