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2005年03月08日

【期刊论文】Axial transport and residence time of MSW in rotary kilns Part I. Experimental

严建华, S.-Q. Li a, b, *, J.-H. Yan a, R.-D. Li a, Y. Chi a, K.-F. Cen a

Powder Technology 126(2002)217-227,-0001,():

-1年11月30日

摘要

Experiments on the influences of operational variables on the axial transport of both heterogeneous municipal solid waste (MSW) and homogenous sand are conducted in a continuous lab-scale rotary kiln cold simulator. Compared with sand, the residence time of MSW has a relatively large discrepancy with the ideal normal distribution due to the trajectory segregation of MSW components. The residence time at different axial zone is quite different due to the varied bed depth profile along the kiln length. MSW has a longer mean residence time (MRT) and a lower material volumetric flow (MVF) than sand because of the higher hd than sand. The increment of both rotating speed and kiln slope reduces MRT, and increases MVF. Exit dam has a significant impact on the MRT and the influence of internal structure group consisting of various axial ribs and circular ribs is mainly determined by the height of circular ribs. Inside wall roughness also has effect on MRT through changing the bed regimes. For a case with the certain inlet and exit bed depths, the product of MRT and MVF holds at a constant within the limits of experimental errors in spite of the changing experimental variables.

Rotary kiln, MSW, Axial transport, Mean residence time, Material volumetric flow

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2005年03月08日

【期刊论文】The fragmentation of coal particles during the coal combustion in a fluidized bedq

严建华, Hongtao Zhanga, *, Kefa Cen b, Jianhua Yan b, Mingjiang Ni b

Fuel 81(2002)1835-1840,-0001,():

-1年11月30日

摘要

This paper presents an experimental method for studying the fragmentation of coal particles during coal combustion in a fluidized bed and the quantitative fragmentation indexes of 10 typical Chinese coal ranks. The influences of a variety of factors such as the bed temperature, the size of coal particles, the coal rank and the fluidizing medium on the fragmentation index of coal particles are also studied. The research results show that the main reason for the fragmentation of coal particles is the primary fragmentation, and that the volatile matter can drastically influence the degree of fragmentation of coal particles.

Fragmentation, Coal combustion, Fluidized bed

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2005年03月08日

【期刊论文】Study on mixing performance of municipal solid waste (MSW) in differential density fluidized beds (FBs)

严建华, Li Xiaodong*, Yan Jianhua, Ni Mingjiang, Cen Kef a

Chemical Engineering Journal 84(2001)161-166,-0001,():

-1年11月30日

摘要

Mixing performances of municipal solid waste (MSW) in differential density fluidized beds (FBs) have been investigated simulating five kinds of materials (plastic, wood, candle, coal and coal-stone). The results show that the differential density FB technology can realize good mixing performances for different MSW components. The density of MSW components has a conspicuous effect on the mixing characteristics of FB. Also, the size of the components has effects. The mixing index is adopted via a regression analysis to the experimental data, and a mixing expression formula is obtained, that will be beneficial for MSW incinerator design and operation.

Municipal solid waste, Fluidized bed, Mixing performance, Incineration

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2005年03月08日

【期刊论文】Numerical simulation of the effects of turbulence intensity and boundary layer on separation efficiency in a cyclone separator

严建华, Li Xiaodong*, Yan Jianhua, Cao Yuchun, Ni Mingjiang, Cen Kef a

Chemical Engineering Journal 95(2003)235-240,-0001,():

-1年11月30日

摘要

From the point of view of the influence of turbulence structure, this paper presents an elementary numerical analysis of the interaction between a particle and a gas phase. The effects of turbulence structure and the thickness of boundary layer on the separation efficiency in a cyclone separator have been investigated. The effects of the Saffman force on the particle trajectory are also analyzed. The results indicate that the separation efficiency decreases with an increase in turbulence intensity and increases with a decrease in the thickness of the boundary layer. The Saffman force can enhance the separation of small particles and also can shorten their residence time in the cyclone.

Two-phase flow, Separation, Turbulence intensity, Boundary layer

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2005年03月08日

【期刊论文】煤中氯对多环芳烃生成的影响研究

严建华, 尤孝方, 李晓东, 祁明峰, 倪明江, 岑可法

工程热物理学报,2003,24(2):335~338,-0001,():

-1年11月30日

摘要

本文在管式炉上研究了煤中氯对多环芳烃生成的影响,测定了煤中氯台量不同时多环芳烃生成量的变化,并分析了在不同气氛下不同含氯量的煤燃烧时多环芳烃与二噁英生成的相互关系。实验结果表明,在空气中燃烧及氮气气氛热解条件下,随着氯含量的增加,多环芳烃呈减少趋势;氯代反应是导致多环芳烃生成量减少的一个主要原因。

多环芳烃, 氯, 二噁英, 煤

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    浙江大学,浙江

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