污泥桨叶干燥实验+文献综述
关键词 污泥 污泥干燥 干燥特性 桨叶式干燥机 Title Sludge Drying In The Paddle Dryer
Abstract
Sewage sludge has the characteristics of high moisture content and high
volume. It contains large quantities of toxic substances. If we can not
deal with the sewage sludge properly, it will result in secondary
pollution, and it will affect the normal operation of the wastewater
treatment plant. How to dispose of it economically and efficiently has
become a newly world wide problem, and is being sought after both in China
and abroad. The characteristic of the sewage sludge in the static thermal
drying process has been studied experimentally. The experimental includes:
the influences of two factors, such as the diameter of the sludge particles
and the temperature in the drying process. In this subject, study the
movement of the sewage sludge in the paddle dryer. Analysis the impact of
the speed of the shaft and the temperature of the conducting oil in the
drying process. Make a best choice of the technology. Bring out two
suggestions for improvement of the paddle dryer, such as the collection
of the exhaust gas.
Keywords sludge sludge drying drying characteristics paddle dryer
目 次
1 绪论1
1.1 研究的背景与意义..1
1.2 污泥的基本特性....1
1.3 国内外污泥处理处置现状.4
1.4 污泥的干燥机理和装置..12
1.5 本文的研究目的...17
2 污泥的理化性质分析.18
2.1 污泥的工业分析...18
2.2 污泥的干燥特性研究....20
3 桨叶式干燥机实验研究....25
3.1 污泥桨叶干燥实验.25
3.2 干燥实验结果及分析....29
3.3 工艺改进....29
结 论.31
致 谢.32
参考文献....33
1 绪论
1.1 研究的背景与意义
污泥是污水处理过程中产生的固体沉淀物质。根据其来源可以划分为：市政
污泥、管网污泥、河湖淤泥、工业污泥。污泥所含的污染物一般均有很高的热值，
但由于大量水分的存在，使得这部分热值无法利用。如果焚烧高含水率的污泥，
不但得不到热值，还需要补充大量燃料才能完成燃烧；经过机械脱水后的污泥，
含水率80%左右，其处置难度和成本也较高，因此有必要将污泥干化。将污泥的
含水率降到40%左右，然后再将其焚烧，焚烧产生的热量可以满足干燥部分甚至
全部污泥的需要。无论焚烧后是制造建材还是他用，减少含水率是关键，因此，