EFFECT OF HAMMER SPEED AND GRAIN GENUS ON HAMMER MILL PERFORMANCE.

Transcription

1 CRD, kw. h/mg m 2 /kg kg/kw.h kg/kw.h m 2 /kg m 2 /kg ,35 kw.h /Mg m 2 /kg EFFECT OF HAMMER SPEED AND GRAIN GENUS ON HAMMER MILL PERFORMANCE. M.K.AHMED Department of Agricultural Mechanization College of Agriculture / Univ. of Baghdad ABSTRACT An experiment was conducted to know the effects of hammer speeds ;, 73.5, 71.8 m/s when grinding three types of grains ; wheat, barley and maize by useing 9 mm screen. A factorial experiment with C R D of three replications was used. Samples of 100 g were taken to sieving for obtain geometric mean particle diameter and geometric standard deviation and specific surface area of ground grain. Specific energy and specific capacity of hammer mill were also estimated. Increasing hammer speed from 71.8 to m\s increased specific energy from 3.96 to kw.hymg.it also increased geometric standard deviation from 2.42 to 2.55 and increased specific surface area from to m 2 \kg, but speed decreased specific capacity from 253to 232 kg\kw.h and geometric mean particle diameter from 976 to 757 micron. Wheat and maize were superior to barley by increasing specific capacity from 243 to 242 to 230 kg\kw.h, respectively. Wheat was superior to barley by increasing specific surface area from to m 2 \kg. However wheat gave higher geometric standard deviation which was 2.58, barley gave higher geometric mean particle diameter ( micron ) and higher specific energy ( 4.35 kw.h\mg ).Barley at low speed( 71.8 m\s ) gave higher geometric mean particle diameter ( 1289 micron ) and maize and wheat gave at higher speed ( m\s) lower geometric mean particle diameter ( 682 and 687 micron, respectively).maize at higher speed ( m\s) gave lower geometric standard deviation ( 2.51 ).Wheat at higher speed m\s gave higher specific surface area( m 2 \kg ). We have concluded from these results that barley consumes higher specific energy and lower specifc capacity and higher diameter of of the particuls. this was attributed to the nature of barley that contains higher rate of fiber. Increasing hammer speed will decrease geometric mean particle diameter and specifc capacity. We recommend using the speed 71.8 m\s when coarse ground needed, The engineere of the mill should measure energy and geometric mean diameter to know energy consumption ana partical size suitable to the purpose of ground needed.

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6 المصادر:- البنا عشيش رمو وناطق صبزي حسن معداث البذار والشراعت وسارة التعليم العالي والبحث العلمي جامعت الموصل ص ASAE. Engineering Practice : ASAE.EP Use of SI. (Metric) Units. Trans, of the ASAE. 36 (1): ASAE S Test procedure for solids -miting equipment for animal feeds ASAE Standards p Fang, Q., MA. Hanna, E.Haque, and C.K. Spilman Neural network modeling of energy requirements for size reduction of wheat. Trans, of the ASAE. 43 (4): Hall, C.W Processing Equipment for Agricultural Products. AVI, LTD.p:l Henderson. S.M. and R.L Perry Agricultural Process Engineering. John Wiley and Sons, Inc.p:l Herrman T.J. and T.Loughin Processing and shelf -life performance of feed manufactured from high-moisture corn.trans, of the ASAE. 46 (3): Istvan, B Particle size distribution of barley ground by hammer mill.. Trans, of the ASAE. 23 (6): Kasim, A.B., H.M., Edwards Effect of sources of maize and maize particle size on the utilization of phytate phosphorus in broiler chicks.animal Feed Sci. Tech. 86: Mani S. L., G. Tabil, S. Sokhansang Mechanical properties of corn stover grind.trans, of the ASAE. 47 (6): Pfost, H.B. and V. E. Headley Use of logarithmic normal distribution to describe hammer mill performance. Trans, of the ASAE. 14. (3): Rausch, K.D., R.L. Belyea, M.R. Ellersieck, V. Singh Particle size distributions of ground corn and DDGS from dry grind processing. Trans, of the ASAE. 48 (1): Richey,C.B., P.Jacobson, C.W.Hall Agricultural Engineers Handbook McGraw-Hill. USA. P Rudnitski S Handling Agricultural Materials, Size Reduction and Mixing. Research Branch, Agriculture Canada.Canadian Government Publishing Center.Ottawa Canada. P Svihus, B., K.H. Klovstad Physical and nutritional effects of pelleting of broiler chicken diets made from wheat ground to different coarsenesses by the use of roller mill and hammer mill. Animal Feed Sci. Tech. 117:

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