Determining the degree of coal oxidation at PAO AKKhZ

Methods of assessing coal oxidation are compared. The method developed by the Soviet Institute of Mining and the Coal Chemistry Institute is most expedient. On that basis, a draft of the Ukrainian DSTU standard on determining the oxidation of coal has been formulated. The method has been successfully used in selecting the flotation agent for coal enrichment at PAO Avdeevskii Koksokhimicheskii Zavod (AKKhZ).     

Sulfolane and dimethyl sulfoxide as extractants

The use of sulfolane and dimethyl sulfoxide in liquid extraction and extractive rectification is considered.     

Improving solid-fuel pyrolysis and gasification for effective cogeneration

The thermal conversion of solid fuel is considered (for the example of biomass), with assessment of the yield of volatiles and coke residue. The optimal temperature range for its pyrolysis (the range corresponding to maximum heat of combustion of the gases per unit mass of the initial product) is identified. The influence of steam and air flow rates on the gasification products is studied. A system for the generation of thermal and electrical energy in the steam-gas cycle is proposed, with a biomass gasification unit. The energy loads of a population center are calculated, with engineering and economic assessment of the steam-gas cycle. Biomass-based cycles are compared, from the perspective of the energy efficiency of a cogeneration system.