Mechanism of the Suppression of Sulfur Oxides in the Oxidative Thermolysis Products of Coals upon Their Combustion in a Mixture with Dispersed Wood

The thermal decomposition of the mixtures of crushed coal and wood was experimentally studied in a temperature range from 400 to 1000°C. According to the results of the experiments, the possibility of using wood as an additive to mixed fuel based on coal to decrease the yield of sulfur oxides upon combustion in large- and small-scale power boilers was confirmed. With a decrease in the energy characteristics (calorific value) of these mixed fuels by no more than 9%, as compared with widely used homogeneous grade T coal, the environmental parameters were significantly improved on the combustion of a mixture of coal and wood. It was found that a significant synergistic effect on the sequestration of sulfur oxides was achieved during the formation of calcium and aluminum sulfates in the ash of mixed fuel due to the joint thermal decomposition of coal and wood particles at a wood fraction from 10 to 50% in the mixture.