摘要
污泥焚烧在我国得到越来越多的工程化应用。焚烧前通常热干化预处理,焚烧烟气余热用于预热燃烧空气、产生蒸汽补充干化单元的热能消耗,不足部分采用外源热能。干化、焚烧、余热利用三个单元互相影响、联系紧密,系统分析三大关联单元重要参数间的交互影响规律是最大化降低系统能耗的必要前提。探索采用Aspen Plus软件构建污泥干化焚烧的工艺模型,并通过多要素的关联分析进行热工设计的能量优化配置。模拟过程以“焚烧温度870℃”为模型运行约束条件,以“入炉含水率最高”和“外源蒸汽需求量最低”为模型运行的优化目标,通过系统内置的灵敏性分析揭示了“一次风温”,“干化热损失”和“污泥热值”对优化目标参数的交互影响规律,并考察了过量空气系数的影响。基于模拟分析结果对污泥干化焚烧工艺设计、关键设备设计选型及工艺运行提出建议。
As a major sludge treatment technique,mono-incineration of sewage sludge has been adopted more and more frequently.Sludge is usually thermally dried before incineration,and the heat carried by the flue gas is reused to preheat combustion air and generate steam for sludge drying.When it is insufficient to supplement the heat energy demand of drying,external heat energy is used.Drying,incineration and heat recovery are closely related.Systematic analysis of the interaction between the three related units is necessary to minimize energy consumption.In this paper,Aspen Plus is used to develop the process model of sludge drying and incineration,and the energy optimal allocation of thermal design is carried out through the correlation analysis of multiple factors.The simulation process takes'incineration temperature being 870 C'as the model operation constraint,and‘moisture content of sludge to be sent to furnace being the highest'and°external steam consumption being the lowest'as the optimization objectives to run.Built-in sensitivity analysis reveals the interactive influence of'primary air temperature',‘drying heat loss'and‘sludge calorific value'on the optimization target parameters,and the influence of excess air coefficient is also investigated.Based on the results,suggestions on the process design,key equipment design and selection as well as process operation are put forward.
作者
段妮娜
谭学军
张辰
DUAN Nina;TAN Xuejun;ZHANG Chen(Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China)
出处
《给水排水》
CSCD
北大核心
2023年第7期22-28,共7页
Water & Wastewater Engineering
基金
国家重点研发计划项目(2020YFC1908700,2020YFC1908701)。
关键词
污水处理厂污泥
干化焚烧
热工模拟
Sewage sludge
Drying and incineration
Thermal simulation
