添加剂对垃圾焚烧飞灰熔融过程二噁分解的影响  

Influence of Additives on Decomposition of PCDD/Fs During MSWI Fly Ash Melting Process

作　　者：李润东[1] 聂永丰[1] 李爱民[2] 王雷[2] 池涌[3] 岑可法[3] 

机构地区：[1]清华大学环境科学与工程系,北京100084 [2]沈阳航空工业学院清洁能源与环境工程研究所,沈阳110034 [3]浙江大学热能所,杭州310027

出　　处：《环境科学》2004年第1期144-148,共5页Environmental Science

基　　金：国家高技术研究发展计划 ( 863计划 )项目 (No .2 0 0 2AA64 40 10 )

摘　　要：为了研究添加剂对垃圾飞灰熔融处理过程中二分解特性的影响 ,选择碱性氧化物CaO和液体陶瓷 (LC) 2种添加剂 ,改变温度、气氛和熔融时间研究 2种添加剂对二分解率的影响 .研究表明CaO对二分解影响随气氛不同而改变 ,氧化气氛下 ,加入CaO使二的分解率略微降低 ,而在还原气氛下则会使二分解率升高 .液体陶瓷添加剂对熔融过程二分解有显著影响 .14 0 0℃时 ,随着LC添加比例由 0增加到 10 % ,二分解率则从 99 997%升高到 10 0 % .同时加入10 %的LC可以使二的完全分解温度由无添加剂时的 14 6 0℃降低至 110 0℃ .The melting process of municipal solid waste incinerator (MSWI) fly ash was investigated in order to study the influence of additives on decomposition characteristics of dioxins (polychlorinated dibenzo-p-dioxins and polychlorinated dibenzo-p-furans, PCDD/Fs). The melting treatment of MWSI fly ash was performed at a batch-melting furnace with two types of additives, CaO and liquid ceramic (LC), at different melting temperatures, melting atmospheres and treatment times. The results demonstrate that the effect of CaO on PCDD/Fs decomposition changed with the type of atmosphere. The decomposition and removal efficiency (DRE) of dioxins increased slightly with 20% CaO in an oxidative atmosphere, while it decreased obviously in an inert atmosphere. There is an important influence by liquid ceramic on the decomposition of PCDD/Fs. The DRE of PCDD/Fs in MSWI fly ash increased from 99.997% to 100% with the addition of LC increasing from zero to 10% at 1400℃. The temperature, in which the PCDD/Fs were completely decomposed, decreased from 1460℃ to 1100℃ when 10% LC was added into fly ash.

关 键 词：二噁英 熔融 添加剂 液体陶瓷 飞灰 

分 类 号：X705[环境科学与工程—环境工程]