High Temperature Excess Enthalpy Combustion for Efficiency Improvement and NOx Abatement

New development utilizing an excess-enthalpy combustion technology has been carried out in order to increase thermal efficiency in industrial furnaces while reducing NOx emissions. High Temperature Excess-enthalpy Combustion, a technology using high calorific fuel and high temperature ai r preheated by its own flue gas, consists of two distinguished characteristics; effective waste-heat recovery using a regenerative heat exchanger and combustion using ai r preheated to higher than 1000 degree Centigrade. Utilization of High Temperature Excess-enthalpy Combustion combined with high flow rate gas recirculation lowers the maximum combustion temperature and provides a uniform temperature profile in furnace. This improves thermal efficiency and helps to control NOx emissions by reducing the maximum flame temperature without causing unstable combustion. The basic characteristics of the heat transfer resulted from this advanced combustion and heating method, has been investigated by using a simple heat balance calculation.