Abstract
The graphite furnaces, which are extensively used for high-purity graphite production, inevitably discharges a large amount of waste heat that requires significant recovery for purpose of the improved energy efficiency. The paper numerically analyzed the heat transfer performance of a graphitization furnace under the electrical-heating and natural-cooling period. The temperature-dependent properties and heat transfer coefficients were used to predict the waste heat recovery potential along with on-site measurements. The results show that during the graphitization production, the core furnace temperature can reach 3000°C while the petroleum coke surface reaches 368°C without the combustion of the volatile in the coke. The heat dissipation on the top coke surface accounts for 48.5% of the total electricity input and 66.9% of the total heat dissipation from the furnace, respectively. The equivalent emission reduction of CO2 , SO2 and NO x are 47.5 t, 7.4 t and 3.6 t respectively per annum. The investigation of the waste heat recovery potential for graphite furnaces can provide a reference for the optimization of heat recovery equipment and operation for graphite furnaces.
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