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Experimental study on drying of typical MSW under incinerator-like conditions

science china(Technological sciences) 2007年第5期50卷 636-643页

作者： zhang yanguo1, chen meiqian2, meng aihong1, li qinghai1 & chen yunxuan2 1 key laboratory for thermal science and power engineering of ministry of education, tsinghua university, beijing 100084, china 2 School of Mechanical, Electronical and Control engineering, beijing Jiaotong university, beijing 100044, china key laboratory for thermal science and power engineering of ministry of education Tsinghua University Beijing China School of Mechanical Electronical and Control Engineering Beijing Jiaotong University Beijing China

In this paper, a series of experiments were conducted to investigate the drying of typical municipal solid wastes (MSW) in a muffle incinerator. From the experimental drying characteristic curves, the effects of temperature on drying process were observed to be more obvious in the low temperature region than in the high tem- perature region in muffle incinerator. At a specified drying temperature, drying time was highly dependent upon the packed waste thickness, having an exponent rela- tion with the thickness. When the drying temperature increased or the thickness of potato bulks was diminished, the maximum drying rate reduced. Based on the first-order reaction, activation energy (Ea), and factor A of potato and cabbage were determined.

关键词： drying, MSW, potato blocks, cabbage stems, temperature, dying rate

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Study on drying and combustion process in grate-CFB incinerator

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science china(Technological sciences) 2009年第5期52卷 1153-1160页

作者： qinghai li yanguo zhang meiqian chen aihong meng ChangHe chen key laboratory for thermal science and power engineering of ministry of education Tsinghua University Beijing 100084 China School of Mechanical Electronical and Control Engineering Beijing Jiaotong University Beijing 100044 China

The drying and combustion process in the combined grate and circulating fluidized bed (grate-CFB) municipal solid waste (MSW) incinerator was investigated experimentally and mathematically. The drying grate bed was simulated by a muffle furnace, which could be controlled at a constant temperature level. The kind of wastes, thickness of waste layer fed and temperature were chosen as the adjustable parameters to study their effect on the drying process. The experimental results indicated that the hydrophilic wastes were more difficult to be dried than the hydrophobic wastes. The higher the temperature is the easier the waste is to be dried. The thinner waste layer is favorable to drying the waste. The pyrolysis experiment in the furnace showed that the higher temperature level could reduce the conversion rate of carbon to carbon monoxide. The semi-empirical mathematical model that included the bed material distribution submodel, volatile matter release submodel, carbon particle combustion submodel and so on was proposed. A 260 t/d grate-CFB incinerator was modeled and the model predicted bulk density agreed with the measured value from industrial field test. The predicted flue gas (e.g. CO2, CO) concentration deviated slightly from the industrial test data. The parameters and variables used in the model were determined by the experiments or practical field test. This model can be used to design the grate-CFB incinerator and guide its operation.

关键词： drying waste incineration grate-CFB combustion model

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