Shanghai Municipal Engineering Design Institute (Group) Co.,Ltd.
Key Laboratory of Energy Thermal Conversion andControl of Ministry of Education,School of Energy and Environment,Southeast University

污泥焚烧处置是实现其减量化和资源化利用的有效手段,富氧燃烧被认为是最有应用前景的CO2捕集技术之一,将污泥焚烧技术和富氧燃烧技术相结合的污泥富氧燃烧技术不仅可以实现污泥的清洁高效处理,还可以实现燃烧中的CO2富集。但针对污泥流化床富氧燃烧技术的研究尚不充分,富氧燃烧独特的高O2浓度、高浓度CO2气氛会对污泥燃烧及污染物生成转化特性产生不可忽略的影响。在实验室规模的鼓泡流化床反应器上系统考察了O2浓度、床层温度、流化数、污泥粒径和污泥含水率等因素对污泥富氧燃烧特性和氮氧化物排放特性(NO、NO2和N2O)的影响。研究结果表明,相同O2浓度条件下,O2在O2/CO2气氛中扩散速率低于其在O2/N2气氛,污泥颗粒在O2/CO2气氛下的燃烧速率和燃尽特性均弱于其在O2/N2气氛下燃烧;而O2/CO2气氛中燃料氮的转化率低于相同氧浓度的O2/N2燃烧气氛下;随着O2浓度的增加,污泥颗粒的富氧燃烧特性显著改善,但是也导致了更高的NOx排放和燃料氮转化率;污泥含水率的增加可以降低燃尽时间和燃料氮的转化率,床层温度和流化数的增加均可不同程度地降低污泥颗粒的燃尽时间,床层温度和污泥粒径的增加会提高NOx的排放和燃料氮的转化率,但是流化数的增加会明显降低燃料氮的转化。

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.

国家重点研发计划资助项目(2019YFE0124400);上海市科委基金资助项目(21230731100)

金则陈,卢骏营,胡维杰,等.污泥流化床富氧燃烧及污染物排放特性研究[J].洁净煤技术,2025,31(3):156−165.

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.