印染污泥焚烧过程氯元素代谢及调控  

Chlorine element metabolism and regulation during the incineration process of textile dyeing sludge

作　　者：俞彩孟 张东明 李梦圆 严坤 杨晨 吕洪炳 田金平[2] 陈亚林[2] 陈吕军[2] YU Caimeng;ZHANG Dongming;LI Mengyuan;YAN Kun;YANG Chen;LÜHongbing;TIAN Jinping;CHEN Yalin;CHEN Lujun(Zhejiang Zheneng Xingyuan Energy Saving Technology Co.,Ltd.,Hangzhou 311121,China;School of Environment,Tsinghua University,Beijing 100084,China)

机构地区：[1]浙江浙能兴源节能科技有限公司,杭州311121 [2]清华大学环境学院,北京100084

出　　处：《环境工程学报》2024年第8期2311-2318,共8页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(72274103);浙江省“尖兵”“领雁”研发攻关技术资助项目(2023C03008)。

摘　　要：印染污泥热值高,焚烧热电联产具有积极的减碳效应。但因行业特点,印染污泥含氯高,对锅炉安全运行和烟气超低排放带来新的技术难题。定量揭示印染污泥焚烧过程氯元素的组成及迁移代谢特征,并开展精细化氯物质流管理,具有重要应用价值。依托2500 t·d^(-1)印染污泥干化焚烧热电联产典型工程案例,建立基于最小工艺单元的氯元素物质流分析模型,通过实测和在线监测,重点分析干化、焚烧、除尘、脱酸等主要工艺环节,刻画全流程氯元素迁移代谢图景,识别氯物质流管理关键节点。研究发现:1)案例工程入炉印染污泥单位热值氯含量为1.4~2.4 mg·kcal^(-1)(低位热值,以氯计),为燃煤电厂入炉煤单位热值氯含量平均值的14.6倍;2)原烟气氯化氢浓度为170~250 mg·Nm^(-3),是燃煤电厂的2~5倍;3)采用双塔双循环湿法脱酸烟气净化工艺,可将原烟气氯化氢浓度降至5 mg·Nm^(-3)以下,实现烟气超低排放。研究建议:一是加强入炉污泥氯含量监测,当印染污泥氯含量大于3700 mg·kg^(-1)时,可通过掺加市政污泥,调控入炉端氯含量,保证锅炉安全运行;二是加强烟气脱硫脱酸系统氯离子含量检测,宜控制浆液氯离子浓度在20000 mg·L^(-1)以下。可对相关污泥焚烧资源化工程应用提供借鉴参考。The high calorific value of textile dyeing sludge makes it suitable for incineration cogeneration,which has a positive carbon reduction effect.However,due to industry-specific characteristics,high chlorine content in textile dyeing sludge poses new technical challenges for safe boiler operation and achieving ultra-low emission of flue gas.Quantitatively revealing the composition and migration characteristics of chlorine elements during the incineration process of printing and dyeing sludge,and conducting refined management of chlorine substance flow,holds significant practical value.Based on a typical engineering case of 2500 t·d^(-1) textile dyeing sludge drying-incineration cogeneration,this study established a chlorine element mass flow analysis model based on minimal process units and focused on analyzing key process stages such as drying,incineration,dedusting,and desulfurization through measurements and online monitoring.This study illustrated the comprehensive chlorine element migration and metabolism patterns throughout the entire process,identifying critical nodes for chlorine substance flow management.The study results showed that:1)The chlorine content of the sludge fed into the incinerator ranged from 1.4 to 2.4 mg·kcal^(-1)(on a lower heating value basis,chlorinespecific),which surpassed the average chlorine content in coal for coal-fired power plants by a factor of 14.6;2)The initial hydrogen chloride concentrations in the flue gas were found to be between 170 to 250 mg·Nm^(-3),markedly exceeding the levels typically recorded in coal-fired power plants by two to five fold;3)The implementation of an innovative dual-tower,dual-loop wet flue gas desulfurization technique had been shown to substantially decrease the hydrogen chloride concentration in the flue gas to below 5 mg·Nm^(-3),thus enabling the attainment of ultra-low emission standards.Building on its findings,the study posited two primary strategies to enhance chlorine material flow management in sludge-to-energy processes.The first strate

关 键 词：印染污泥 污泥焚烧 氯元素代谢 物质流管理 超低排放 

分 类 号：X705[环境科学与工程—环境工程]