Y型网式过滤器堵塞过程对有机肥浓度的响应研究  

Response of Process of Y-net Filter Clogging to Organic Fertilizer Concentration

作　　者：朱德兰[1,2] 王蓉 阮汉铖 ZHU Delan;WANG Rong;RUAN Hancheng(College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling,Shaanxi 712100,China;Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas,Ministry of Education,Northeast A&F University,Yangling,Shaanxi 712100,China)

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [2]西北农林科技大学旱区农业水土工程教育部重点实验室,陕西杨凌712100

出　　处：《农业机械学报》2020年第7期332-337,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：杨凌示范区产学研用协同创新重大项目(2017XCY-09);“十二五”国家科技支撑计划项目(2015BAD22b01-02);国家外国专家局“111”计划项目(B12007)。

摘　　要：为研究水肥一体化设备中用于过滤有机肥的Y型网式过滤器的堵塞规律,对Y型网式过滤器在初始流量500 L/h、水源压力117.6 kPa下,设置25、30、40、50 g/L共4种黄腐酸钾有机肥肥液质量浓度,进行了过滤器堵塞试验,分析了Y型网式过滤器的局部水头损失与单个滤孔滤网清洁度(单个滤孔有效过水断面面积与孔隙总面积比值)S/S0的关系,并利用XRD分析了过滤器内堵塞物质的成分。结果表明:肥液质量浓度对过滤器滤网清洁度影响显著,建议肥液质量浓度不超过40 g/L;过滤器局部水头损失在S/S0减小到10%后才逐渐开始增大,过滤器局部水头损失与滤网清洁度、肥液质量浓度有关,利用多项式拟合给出了过滤器滤网清洁度与肥液质量浓度、施肥持续时间的关系式及局部水头损失与肥液质量浓度、滤网清洁度的关系式;滤网堵塞物质主要成分为硫酸钙、草酸钙。本研究结果可为水肥一体化设备中过滤器的选择提供理论参考。In order to study the blockage law of Y mesh filter used to filter organic fertilizer in water and fertilizer integrated equipment,the clogging test of Y type mesh filter was carried out at the initial flow rate of 500 L/h and the water source pressure of 117.6 kPa,and the concentration levels of four kinds of potassium fulvic acid organic fertilizer solution,25 g/L,30 g/L,40 g/L and 50 g/L were set up.The relationship between the local head loss coefficient of Y type mesh filter and the effective cross section area of single filter,the proportion of single filter effective cross section area and total area S/S0 was analyzed,and the composition of blockage material in the filter was analyzed by XRD.The results showed that the concentration of fertilizer solution had a significant effect on the screen cleanness of the filter.It was suggested that when the concentration of fertilizer solution was not more than 40 g/L;the flow rate of 4 m head loss in the filter was decreased by 17%~20%.The local head loss of filter was increased gradually when the screen cleanness was reduced to 10%.Correlation analyses displayed the local head loss coefficient of filter was only related to S/S0 and independent of fertilizer concentration.Furthermore,the formula for calculating the local head loss coefficient of filter under potassium fulvic acid organic fertilizer was put forward by using multinomial fitting;filter-element blocking substances mainly included calcium sulfate and calcium oxalate.The research results can provide some theoretical reference for the selection of filter in water and fertilizer integrated machine.

关 键 词：水肥一体化 过滤器 有机肥 局部水头损失 滤网清洁度 堵塞物成分 

分 类 号：S224.21[农业科学—农业机械化工程]