多孔介质类型和喷嘴设计对加压多孔介质过滤器反冲洗机制的影响

IF 4.4 1区 农林科学 Q1 AGRICULTURAL ENGINEERING
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引用次数: 0

摘要

滴灌中使用的加压砂滤器需要定期反冲洗,以便将杂质颗粒从多孔介质中冲出。这一过程需要消耗大量的能源和水。要选择更有效的反冲洗操作条件,就必须准确了解压降和床层膨胀的信息,而后者在商用过滤器中是无法测量的。一项实验研究使用了一个比例过滤器,利用窗口观察床层膨胀情况,该过滤器有三种多孔介质类型(玻璃微球和两种硅砂)、两种填料介质床层高度(200 毫米和 300 毫米)和四个喷嘴(一个商用喷嘴和三个原型喷嘴)。针对不同的表面速度,对过滤器实验配置的 24 种组合进行了研究。对所有 705 次测试的数据和视频记录进行了仔细分析,以获得膨胀床高度的平均值和标准偏差。对流化床的动力学特性进行了分析。结果表明,喷嘴设计对压降有很大影响,因此也影响反冲洗所需的功率。喷嘴设计对流化床动力学也有明显的影响,但其对决定膨胀床总高度的影响有限,这主要取决于多孔介质的类型。就能量效率和膨胀床的孔隙率而言,微球是最有效的组合,尽管从文献综述来看,微球的保留效率可能值得怀疑,而且微球喷嘴的几何形状是圆锥形的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of porous media type and nozzle design on the backwashing regime of pressurised porous media filters

Pressurised sand filters used in drip irrigation need periodic backwashing to flush the contaminant particles out of the porous media. This process consumes high amounts of energy and water. The selection of more efficient backwashing operational conditions requires accurate information of the pressure drop and the bed expansion, the latter being not measured in commercial filters. An experimental study with a scaled filter that used a window to observe the bed expansion was conducted with three porous media types (glass microspheres and two silica sands), two packed media bed heights (200 mm and 300 mm) and four nozzles (one commercial and three prototypes). The 24 combinations of the filter experimental configuration were investigated for different superficial velocities. Both data and video recordings for all the 705 tests conducted were carefully analysed to obtain mean values and standard deviations of the height of the expanded bed. The behaviour of the fluidised bed dynamics was characterised. Results indicated that the nozzle design had a strong influence on the pressure drop, and, in consequence, on the power required for backwashing. It also had an observable impact on the fluidised bed dynamics although its effect on determining the overall height of the expanded bed was limited, this being more dependent on the type of the porous media. The most effective combination in terms of energy efficiency and porosity of the expanded bed was obtained with microspheres, though its retention efficiency might be questionable from the literature review, and the frustoconical nozzle geometry.

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来源期刊
Biosystems Engineering
Biosystems Engineering 农林科学-农业工程
CiteScore
10.60
自引率
7.80%
发文量
239
审稿时长
53 days
期刊介绍: Biosystems Engineering publishes research in engineering and the physical sciences that represent advances in understanding or modelling of the performance of biological systems for sustainable developments in land use and the environment, agriculture and amenity, bioproduction processes and the food chain. The subject matter of the journal reflects the wide range and interdisciplinary nature of research in engineering for biological systems.
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