污泥预干燥与流化床焚烧特性研究

发布时间：2018-05-07 16:48

  本文选题：城市污泥 + 预干燥　； 参考：《华北理工大学》2017年硕士论文

【摘要】：污泥处理处置是固体废弃物处理中的技术难题,而预干燥污泥焚烧是当今研究的热点。论文以污泥预干燥与焚烧特性研究为题,具有重要的工程实践价值。以国内某污泥处理处置工程为研究对象,采用理论分析与数值模拟相结合的方法,对预干燥污泥焚烧特性进行分析。首先,在系统主机选型的基础上,进行热平衡计算,结果表明:入炉污泥含水率为64%时,系统可稳定运行,且外供蒸汽量较少;其次,根据(火用)分析方法,把系统划分为流化床焚烧炉、余热锅炉、干燥混合装置3个单元,通过对不同工况下的理论计算及对比分析,探讨系统(火用)利用指标的变化规律;最后,对污泥流化床焚烧特性进行数值模拟,模拟表明:随入炉污泥含水率的增加,焚烧炉排烟温度降低、相对压力降低、速度分布趋于均匀,烟气成分含量中,CO含量变化不大,CO2、SO2与NO含量略有降低。通过对预干燥污泥焚烧系统的理论分析和模拟研究,表明污泥最佳入炉含水率为64%,且控制燃烧温度在850℃时,外供能量消耗最少,其研究结果可对城市污泥预干燥焚烧系统的设计与运行优化提供理论参考。
[Abstract]:Sludge treatment and disposal is a technical problem in solid waste treatment, and pre-drying sludge incineration is a hot research topic. The research on the characteristics of sludge pre-drying and incineration is of great practical value. The characteristics of pre-drying sludge incineration were analyzed by combining theoretical analysis and numerical simulation with a sludge treatment and disposal project in China. First of all, based on the selection of the main engine of the system, the heat balance calculation is carried out. The results show that the system can operate stably and supply less steam when the moisture content of sludge into the furnace is 64. Secondly, according to the exergy analysis method, The system is divided into three units: fluidized bed incinerator, waste heat boiler and drying mixing unit. Through theoretical calculation and comparative analysis under different working conditions, the variation law of exergy utilization index of the system is discussed. The numerical simulation of sludge fluidized bed incineration characteristics shows that with the increase of sludge moisture content, the flue gas exhaust temperature of incinerator decreases, the relative pressure decreases, and the velocity distribution tends to be uniform. The contents of CO and so _ 2 in flue gas were not changed a little, and the contents of so _ 2 and no in flue gas decreased a little. Through theoretical analysis and simulation study of pre-drying sludge incineration system, it is shown that the optimum moisture content of sludge into furnace is 64 and the energy consumption of external supply is the least when the combustion temperature is controlled at 850 鈩，

本文编号：1857690