Yasynetskyi A. Development and improvement of the method of semi-dry desulfurization of flue gases

The thesis is devoted to the development and improvement of the processes of waste gas cleaning from sulfur dioxide, using a semi-dry method of desulphurization. The specifics of semi-dry FDG technologies of sulfur dioxide absorption with droplets containing ammonia sorbents, absorption of sulfur dioxide by ammonia in gas phase, and combined absorption of sulfur dioxide by ammonia dissolved in the drops are studied. The results of numerical studies of the sulfur desulfurization process on the mathematical model of a chemical droplet reactor operating under a semi-dry desulfurization method are given. On the basis of the experimental and numerical studies carried out, a method for semi-dry ammonia dust-desulfurization of flue gases and method for gas phase ammonia desulphurization of flue gases has been developed. The pilot-scale tests at industrial installation were conducted, to determine the efficiency of the combined desulfurization and dust-cleaning waste gas treatment plant at the sintering machine No. 3 of PJSC "Zaporizhstal". The analysis of the results of industrial pilot tests of the combined cleaning of the exhaust gases of sintering machine No. 3 defined highlighting a number of shortcomings in the technological scheme that required improvement and modernization. Based on the analysis, recommendations have been developed and implemented, for the improvement of the main systems of the combined exhaust gas dust-cleaning installation at sintering production.