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Optimization of a downdraft furnace for rice straw-based heat generation

机译:优化稻草稻草热发电的下落炉

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Open-field burning, a widely used treatment and disposal method for rice straw, poses severe health and environmental problems due to the release of toxic gases and loss of significant soil nutrients. Hence, alternative techniques must be explored. In this study, the use of rice straw as feedstock for a downdraft small-scale furnace to produce heated air for paddy drying was investigated. A two-level factorial experiment was initially implemented using differently conditioned rice straw types, rice straw feed rates, and drying airflow rates. Optimization results using Response Surface Methodology (RSM) showed there is no significant difference in the drying air efficiency using either loose or baled straw. The optimum conditions found were at a rice straw feed rate of 20.67 kgh(-1) and drying airflow rate of 3.03 m 3 s(-)(1), resulting in a drying air efficiency of 86.1%, and an increase in drying air temperature of 18.41 degrees C which was sufficient for paddy drying applications. At the optimum conditions, the average CO and NOx concentrations measured inside the dryer simulator were 76.57 and 2.93 ppm, respectively. The results of this research can be used for pilot studies in actual agricultural cooperatives, as well as provide inputs to life cycle analysis. (C) 2019 The Author(s). Published by Elsevier Ltd.
机译:开放式燃烧​​,广泛使用的稻草处理和处理方法,由于释放有毒气体和显着土壤营养素的丧失,造成严重的健康和环境问题。因此,必须探索替代技术。在这项研究中,研究了使用稻草作为下降的小尺寸炉的原料,以产生用于稻谷干燥的加热空气。最初使用不同调节的稻草类型,稻草饲料速率和干燥气流速率进行两级派分实验。使用响应表面方法(RSM)的优化结果表明,使用松散或母背的秸秆无效率差异。发现的最佳条件是稻草进料速率为20.67 kgh(-1),干燥气流速率为3.03m 3 s( - )(1)(1),导致干燥空气效率为86.1%,干燥空气增加温度为18.41摄氏度,足以用于稻谷干燥应用。在最佳条件下,在干燥器模拟器内测量的平均CO和NOx浓度分别为76.57和2.93ppm。该研究的结果可用于实际农业合作社中的试验研究,并为生命周期分析提供投入。 (c)2019年作者。 elsevier有限公司出版

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