Techno-economic evaluation of solar biomass shredder
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Date
2018
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CCSHAU
Abstract
The present study was carried out to evaluate the techo-economic performance of shredder. Four crops residues viz. wheat straw, paddy straw, pearl millet stalk, and cotton stalks were selected for shredding purpose. Shredding of crop residues was done at speeds (1500, 2500 and 3500) and at five moisture content (6, 8, 10, 12, and 14 %) expect for wheat which was also shredded at 16% and18% moisture content. Both the moisture content and rotational speed significantly affected the performance of shredder. The output results showed that the initial length, diameter and bulk density was recorded as ( 45.7 cm, 3.32 mm), (98.7cm, 3.28mm), (182.7cm,14.3mm) and (145cm,17.1mm) and bulk density was (23.20-28.70 kg/m3), (13.76-14.16 kg/m3), (27.00-31.27 kg/m3) and (14.37-18.20 kg/m3). and for of wheat straw, paddy straw, pearl millet stalk and cotton stalk, respectively. Both the moisture content and rotational speed significantly affected the performance of shredder. Capacity, shredding efficiency and power consumption for shredder were evaluated for all the crop residues. It was found that maximum capacity of 60.39kg/h, 55.61kg/h, 46.77 kg/h and 41.68 kg/h were obtained at 6% moisture content and 3500 rpm for all the crop residues. The optimum shredding efficiency of 97.6%, 96.8%, 98.5% and 99.1% were obtained for wheat straw, paddy straw, pearl millet stalk and cotton stalk, respectively. The maximum power consumption and of shredder was observed to be 2.03 kWh, 2.02 kWh, 2.14 kWh and 1.93 kWh at 16% moisture content and 3500 rpm for wheat straw and 12% moisture content and 3500 rpm for paddy straw, pearl millet stalk and for cotton stalk, respectively. The maximum bulk density was observed as 47.27 kg/m3, 52.23 kg/m3, 58.54 kg/m3 and 69.49 kg/m3 at 18% moisture content and 2500 rpm for wheat straw and at12% moisture content and 3500 rpm for paddy straw, pearl millet stalk and for cotton stalk, respectively. Particle size distribution was also studied for shredded crop residues through sieve analysis. The maximum average length with its weight percentage were recorded as 76.73 mm and 60.73% at 18% moisture content and 1500 rpm, 71.78mm and 60.11%, 60.20 mm and 51.96%, 62.01 mm and 70.12% at 14% moisture content and 1500 rpm for wheat straw, paddy straw, pearl millet stalk, cotton stalk, respectively.
The study of environmental parameters during the entire study showed that the solar radiation varied between 770 to 1289 W/m2 while, temperature varied from 33.1°C to 38.4 °C and humidity varied from 24.6 % to 40.3 % during the entire study period. The payback period and benefit cost ratio of machine were calculated as 4.0 years and 5.0.
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