Development and performance evaluation of hammer mill for sizing rice straw to be used as biomass
2012
Imam, A.I. | Hassan, M.A. | Kishta, A.M. | Yousef, I.S.
In many countries, massive amounts of post-harvest rice residues are eliminated through open air field burning, which presents a threat to public health and poses an environmental pollution problem. So, the overall goal of the present study is to develop knife shape and, to investigate the effect of a set of parameters during grinding rice straw on machine efficiency and bio-product quality using a hammer mill machine to produce a high quality ground rice straw and high machine efficiency with optimum cost. The hammer mill machine was evaluated under three levels of different drum speeds of 2600, 3300 and 4000 rpm, four different sieve hole diameters of 3, 6, 12 and 18 mm, three different number of knives (16, 24 and 32), with two knives shape (rectangle -pyramidal). The evaluation included machine production rate, machine efficiency, specific energy consumption, fineness degree of rice straw and economical costs of rice straw grinding. The obtained data showed that the highest value of machine productivity (158.6 kg/h), the lowest specific energy consumption (43.72 kW.h/Mg) and the lowest cost per mass unit (71.29 L.E/Mg) were recorded in the case of sieve hole diameter of 18 mm, number of knives 24 and drum speed of 4000 rpm with pyramidal knives, the highest value of fineness degree of rice straw 83.74% was recorded in the case of sieve hole diameter of 3 mm, number of knives 24 and drum speed of 4000 rpm with rectangle knives. Hammer mill machine efficiency of 92.7 % was recorded in the case of sieve holes diameter 6 mm, number of knives 24 and drum speed of 3300 rpm with pyramidal knives.
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