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Research on a Novel Shredder for Municipal Solid Waste (MSW)

Author: XiaoLei
Tutor: XiaoBoï¼›HuZhiQuan
School: Huazhong University of Science and Technology
Course: Environmental Engineering
Keywords: Municipal solid waste (MSW) Shredder Biomass Coarse broken
CLC: X705
Type: Master's thesis
Year: 2011
Downloads: 123
Quote: 0
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Abstract


The breakage pretreatment of municipal solid waste (MSW) is necessary to increase the uniformity and ratio of surface area and of MSW to improve the efficiency of the subsequent processing step, while the breakage of MSW mainly concentrates on the hard and brittle materials of MSW in china. The ductile solid waste which makes the hammer crusher difficult to meet the requirements of the breakage of MSW, however, accounts for a large proportion of MSW. It is powerless for the hammer crusher to crush the moisture and ductile material. Based on the composition and volume-mass properties of MSW (i.e., unit weight, void ratio, and water content), a novel shear shredder for organic MSW was presented. The reliability of the shredder was investigated and the influencing factors were studied.Some certain composition MSW was chosen as testing materials, and the product size distribution and specific energy were taken as measurement index. The breakage tests were carried out in the lab-scale shear shredder to evaluate the effects of working parameters: hydraulic pressure, rotor speed, distances between rotating blades, and feeding mode. The results show that the shredder is suitable for the pulverization of MSW With increasing hydraulic pressure the specific energy is reduced, and size distribution of product is finer. When hydraulic pressure is constant, the specific energy decreases with increasing rotor velocity, while the products size distribution is coarser; the fines proportion shows increasing trend with decreased distances between rotating blades, however, the specific shows opposite trend. For the breakage of plastic, the distance should be smaller than the desired particle size. Compared with single-course shredder, the two-inlet operation mode improves shredding efficiency and reduces energy consumption to a great extent. The effects of raw materials characteristics such as feed composition, feed moisture and raw materials size are investigate in the paper. The shredder is much more effective for the pulverization of soft, ductile and fibrous materials, but it is not good at the brittle material There is a tendency for the fine production in products to decrease with the increasing amounts of water content in the feed; with the increasing feed moisture, specific energy shows an increasing trend; under lower hydraulic pressure, the specific energy and product size distribution are more sensitive to the feed moisture than under higher hydraulic pressure. The effect of raw materials size on product size distribution is not evident, while smaller size would result in lower specific energy. In the process of crushing biomass , compared with the traditional shredder , the advantage of the novel shredder is that it has more efficient in crushing soft straw. results shows:novel shredder overcome shortcoming of the traditional shredder in crushing soft straw, and it can meet the requirements of coarse broken.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Solid waste disposal and utilization
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