Open AccessPECULIARITIES OF CALCULATION OF HEAT AND POWER BALANCE FOR ROASTING CONVEYOR MACHINE
Author(s) -
В. И. Бобков,
М. И. Дли
Publication year - 2021
Publication title -
izvestiâ sankt-peterburgskogo gosudarstvennogo tehnologičeskogo instituta (tehničeskogo universiteta)
Language(s) - English
Resource type - Journals
ISSN - 1998-9849
DOI - 10.36807/1998-9849-2021-58-84-70-76
Subject(s) - roasting , carbon dioxide , nepheline , raw material , oxide , chemistry , thermal decomposition , coal , materials science , chemical engineering , mineralogy , metallurgy , organic chemistry , engineering
The work examines the chemical and energotechnological processes of pellet production from fine apatite-nepheline raw materials: moisture removal, carbonate dissociation, taking into account the thermal and technological features of the functioning of roasting conveyor machines. It was established that the same physicochemical processes differ in quantitative characteristics in the process zones of heating, roasting and recovery. The need of the charge for the heat carrier gas for the corresponding zones, the content of carbon dioxide, iron oxide and carbon in dry pellets, which depend on the chemical composition, the degree of carbon dioxide release, iron oxide oxidation and carbon combustion are taken into account. According to the results of the experimental data and depending on the composition of the charge the following characteristics are calculated for each of the zones: heat consumption for limestone decomposition, specific volume of carbon dioxide, heat output during the oxidation of iron oxide, oxygen flow for iron oxide oxidation, heat introduced by carbon dioxide, initial and final heat of heat carrier gas. The mathematical description of heat and power peculiarities of functioning of roasting conveyor machines is proposed. It is based on energy-balance mathematical models and takes into account thermally activated chemical-energotechnological processes, which take place in apatite-nepheline technogenic raw materials during heating