Mathematical Modeling of Processes and Equipment for the Manufacture of Electrode Carbon Graphite Products

Production of electrode carbon-graphite products is one of the most energy-intensive chemical and metallurgical industries. One of the ways to reduce the energy intensity of electrode carbon-graphite products is to improve the energy efficiency of the furnace equipment of its main processes. A mathematical model of the combustion process of synthesis gas and natural gas in the working space of a rotary kiln was formulated. Two numerical models were developed. The first one is to study the heat-hydrodynamic state of a rotary kiln during natural or synthetic gas. The second one is to study the thermal parameters of a rotary kiln during the combustion of synthesis gas together with natural gas. Calculations were carried out to determine the synthesis gas consumption as a substitute for natural gas. It was established that at the expense of partial or complete replacement of natural gas by synthesis gas during operation of a calcining rotary kiln, it is possible to decrease natural gas consumption up to 100%. A complete replacement of natural gas with synthetic gas instead of 192 nm³/h of natural gas, it is necessary to burn 908 nm³/h of synthetic gas, which is significantly less than the synthetic gas capacity of the rotary kiln cooling drum.