A steam dried municipal solid waste gasification and melting process  

作　　者：Gang XIAO Baosheng JIN Mingjiang NI Kefa CEN Yong CHI Zhongxin TAN 

机构地区：[1]State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China [2]Thermo-Energy Engineering Research Institute,School of Energy and Environment,Southeast University,Nanjing 210096,China [3]Division of Waste Science and Technology,Lulea University of Technology,Lulea SE-97187,Sweden

出　　处：《Frontiers of Environmental Science & Engineering》2011年第2期193-204,共12页环境科学与工程前沿（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.50806013);the National Basic Research Program of China(No.2010CB732206);Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20070286074).

摘　　要：Considering high-moisture municipal solid waste(MSW)of China,a steam dried MSW gasification and melting process was proposed,the feasibility was tested,and the mass and energy balance was analyzed.Preliminary experiments were conducted using a fixed-bed drying apparatus,a 200 kg per day fluidized-bed gasifier,and a swirl melting furnace.Moisture percentage was reduced from 50%to 20%roughly when MSW was dried by slightly superheated steam of 150℃-350℃ within 40 min.When the temperature was less than 250℃,no incondensable gas was produced during the drying process.The gasifier ran at 550℃-700℃with an air equivalence ratio(ER)of 0.2-0.4.The temperature of the swirl melting furnace reached about 1240℃ when the gasification ER was 0.3 and the total ER was 1.1.At these conditions,the fly ash concentration in the flue gas was 1.7 g·(Nm^(3))^(-1),which meant over 95%fly ash was trapped in the furnace and discharged as slag.85%of Ni and Cr were bound in the slag,as well as 60%of Cu.The mass and energy balance analysis indicates that the boiler heat efficiency of an industrial MSW incineration plant reaches 86.97%when MSWis dried by steam of 200℃.The boiler heat efficiency is sensitive to three important parameters,including the temperature of preheated MSW,the moisture percentage of dried MSWand the fly ash percentage in the total ash.

关 键 词：municipal solid waste(MSW) steam drying gasification and melting 

分 类 号：X70[环境科学与工程—环境工程]