Incineration is an effective way to achieve the reduction and resource utilization of sludge. Oxy-fuel combustion is consideredone of the most promising CO2 capture technologies. The combination of sludge incineration and oxy-fuel combustion can not onlyachieve clean and efficient treatment of sludge but also achieve CO2 capture during combustion. However,only little research has beenconducted on oxy-fuel combustion of sludge in fluidized beds reactor. The unique high O2 concentration and high CO2 atmosphere ofoxy-fuel combustion can have an undeniable impact on the combustion characteristics,pollutant generation and transformation of sludge.In this work,the effects of O2 concentration,bed temperature,fluidization number,particle size of sludge and moisture content of sludgeon the oxy-fuel combustion of sludge and nitrogen oxide (NO,NO2,and N2O) emissions are systematically investigated on a lab - scalebubbling fluidized bed reactor. The experimental results indicated that under the same O2 concentration conditions,the diffusion rate ofO2 in O2/CO2 atmosphere is lower than that in O2/N2 atmosphere,and the combustion rate and burnout characteristics of sludge particlesunder O2/CO2 atmosphere are weaker than those under O2/N2 atmosphere. In the same oxygen concentration,the conversion rate of fuelnitrogen in O2/CO2 atmosphere is lower than that in O2/N2 atmosphere. With the increase of O2 concentration,the oxy-fuel combustioncharacteristics of sludge particles are significantly improved,but it also leads to higher NOx emission and fuel nitrogen conversion rate.High moisture content of sludge can reduce the burnout time and fuel nitrogen conversion rate. An increase in bed temperature and fluidization number can reduce the burning time of sludge particles to varying degrees. High bed temperature and particle size of sludgewill enhance the NOx emissions and fuel nitrogen conversion rate,while high fluidization number will significantly reduce fuel nitrogenconversion.

金则陈(1992—),男,浙江嘉兴人,中级工程师。E-mail:jinzechen@smedi.com

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JIN Zechen,LU Junying,HU Weijie,et al. Oxy-fuel combustion of sludge in fluidized bed reactor and characteristic ofpollutant emission[J].Clean Coal Technology,2025,31(3):156−165.