Experimental study on the effect of secondary combustion technology on energy efficiency and pollutant emissions in crematoriums

This study aims to deeply explore the impact of secondary combustion technology of crematorium on energy efficiency and pollutant emissions, and conducts research by combining experiments with numerical simulation. A special crematorium system was built in the experiment, and different working conditions such as secondary combustion temperature (800-1200 °C) and air flow rate (1.5-3.0 m 3 /h) were accurately set. K-type thermocouples, online flue gas analyzers, and other equipment were used to measure furnace temperature, energy consumption, CO, NOx, particulate matter, and other components in exhaust gas. Experimental and simulation results show that when the secondary combustion temperature increases from 800 °C to 1000 °C, the energy utilization rate increases from 68.2% to 85.7%; CO emissions decrease from 1250 mg/m 3 to 280 mg/m 3 , a decrease of 77.6%; NOx decreases from 450 mg/m 3 to 180 mg/m 3 , a decrease of 60.0%; and particulate matter concentration decreases by 82.3%. When the temperature of the secondary combustion zone is 1100 °C and the air excess coefficient is 1.2, the overall performance of the system reaches its best. Studies have shown that the secondary combustion technology effectively improves the energy utilization efficiency of the crematorium and reduces pollutant emissions by extending the burnout time and enhancing the mixing effect.