Foris S. The gas-dynamic and thermal conditions which are providing natural gas economy in lime production with shaft counterflow kilns

This dissertation is devoted to the issue of natural gas rate cutting in lime production with shaft counterflow kiln on the basis of increase and introduction of effective calcining working conditions and partial replacement of natural gas by blast-furnace gas. The mathematical model of shaft counterflow lime-stone kiln with central and peripheral natural gas supply is elaborated and realized on the computer. This model takes into account gas dynamics in packed bed of lime-stone material, convective and diffusion substance transfer, fuel combustion, external and internal heat exchange. On the basis of experimental and calculation researches is showed that with shaft counter-flow lime-stone kiln modeling is necessary to take into account turbulent diffusion. It is ensuring substantial improvement of quantitative and qualitative reliability of lime-stone calcining physical process simulation. For the purpose of natural gas rate cutting in lime production The optimization problem of kiln working conditions is solved. As working conditions were examined fuel, air and recycling gas distribution between central and peripheral burners.