Thermodynamic system analysis of calcium carbide based on incomplete combustion oxygen-thermal method

Research of calcium carbide production is of great importance to the utilization of coal. In order to improve productivity and reduce energy consumption. The thermal system in an oxygen thermal process (OTM) calcium carbide furnace was analyzed. This work established a thermodynamic model to analyze the effects of material temperature, ash yield, fixed carbon content and heat loss on calcium carbide purity and total coke consumption. The results showed that the total coke consumption for the synthesis of 1 kg of calcium carbide decreased, the purity of calcium carbide increased, and the effect of heat loss decreased as the temperature of the material entering the reaction area increased. And the effect of coke temperature was much more important than the CaO temperature. Ash yield in the coke should not exceed 20%, otherwise, the purity of calcium carbide produced can’t satisfy the industrial requirement (acetylene productivity is 260 L/kg). In addition, the temperature of the material must be between 1151 ~ 1862°C to meet the requirements of high energy utilization.