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A steam dried municipal solid waste gasification and melting process

Frontiers of Environmental Science & Engineering 2011年第2期5卷 193-204页

作者： Gang XIAO Baosheng JIN Mingjiang NI Kefa CEN Yong CHI Zhongxin TAN State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China Thermo-Energy Engineering Research Institute School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Division of Waste Science and Technology Lulea University of TechnologyLulea SE-97187Sweden

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 *** experiments were conducted using a fixed-bed drying apparatus,a 200 kg per day fluidized-bed gasifier,and a swirl melting *** percentage was reduced from 50%to 20%roughly when MSW was dried by slightly superheated steam of 150℃-350℃ within 40 *** the temperature was less than 250℃,no incondensable gas was produced during the drying *** gasifier ran at 550℃-700℃with an air equivalence ratio(ER)of *** temperature of the swirl melting furnace reached about 1240℃ when the gasification ER was 0.3 and the total ER was *** 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 *** 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

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Research on low emission MSW gasification and melting system

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Frontiers of Environmental Science & Engineering 2007年第4期1卷 498-503页

作者： XIAO Gang NI Mingjiang CHI Yong JIN Yuqi ZHANG Jiaquan MIAO Qi CEN Kefa State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory on Clean Coal Power Generation and Combustion Technology of MOE Southeast UniversityNanjing 210096China

In order to eliminate secondary pollution caused by municipal solid waste(MSW)incineration,a MSW gasification and melting process is *** process is expected to reduce the emission of pollutants,especially heavy-metals and *** this paper,the combustible components of MSW and simulated MSW were gasified in a lab-scale fluidized bed at 400°C-700°C when the excess air ratio(ER)was between 0.2 and *** experimental results indicated that the MSW could be gasified effectively in a fluidized bed at approximately 600°C-700°C when excess air ratio was *** melting characteristics of two typical fly ash samples from MSW incinerators were *** results indicated that fly ash of pure MSW incineration could be melted at approximately 1,300°C and that of MSW and coal co-combustion could be melted at approximately 1,400°*** temperature was over 1,100°C,more than 99.9%of the dioxins could be decomposed and most of the heavy-metals could be solidified in the *** on the above experiments,two feasible MSW gasification and mel-ting processes were proposed for low calorific value MSW:(1)sieved MSW gasification and melting system,which was based on an idea of multi-recycle;(2)gasification and melting scheme of MSW adding coal as assistant fuel.

关键词： municipal solid waste(MSW) low emission gasification and melting dioxins heavy-metal

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