过滤器阻力损失.doc

过滤器阻力损失Filter resistance lossP阻力损失，PaPResistance loss，Pa摩擦系数，无因次Friction coefficient, DimensionlessRe雷诺数，Re=(dn)/u，无因次ReReynolds number，Re=(dn)/u，Dimensionless流体速度，m/sFluid velocity，m/s流体密度，kg/mFluid density，kg/m动力粘度，kg/msDynamic viscosity，kg/msu运动粘度u=/，m/s umovement viscosity u=/，m/sL当量直管段长度，m，类管件过滤器查阅下表“类管件过滤器公称直径与当量直管段长度关系”LEquivalent ascending pipe segment size，m， Kind of fitting filter consult next table “Kind of fitting filter nominal diameter and equivalent ascending pipe segment size relations”D类管件过滤器内径，m Dtype filter tube diameter，mdn当量直径m，类管件过滤器取管件内径D，筒壳式过滤器取4s/c dnEquivalent diameter m ,The kind of fitting filter take the fitting inside diameter D，The tube shell type filter take4s/cS液体流通面积，mSLiquid flow area，mC液体湿周（湿润周长），C2X（筒体内径筒体高度）m C2X（筒体内径筒体高度）m CLiquid wetted perimeter(Moist perimeter) ，C2X（cylinder diameter + cylinder height）m -入口阻力系数，取1.1 - Entrance friction coefficient, Taking1.1 -出口阻力系数，取0.5 -Export friction coefficient, Taking0.5类管件过滤器公称直径与当量直管段长度关系Category filter tube nominal diameter and length of straight pipe equivalent relations公称直径DN Nominal diameter DN5080100150200当量直管段长度L(10mm) Equivalent ascending pipe segment size L(10mm)25301823152022383240公称直径DNNominal diameter DN250300350400450当量直管段长度L(10mm) Equivalent ascending pipe segment size L(10mm)27435865488560956298a. 对于Y 型等管件类过滤器，按下式计算for the Y-type, such as tube-type filter, determined using the following equation: b. 对于筒壳类过滤器，按下式计算or the drum shell type filters, determined using the following equation: 过滤面积及孔目数Filtration area and Hole item of number过滤面积通常指丝网的有效流通面积，可以查阅下表“滤网规格”得知有效面积，滤网总面积与有效面积率的乘积即为过滤面积（有效流通面积）。通常，考虑过滤面积按过滤器公称通径的20 倍设计，已足够满足使用场合。除非在非常见的特殊环境使用，才予以特殊考虑。The filtration area usually refers to silk screens effective flow area, May the consult next table “the mesh specification” knowing effective area, Mesh total area and active surface rate product namely for filtration area (effective flow area). Usually, The consideration filtration area according to the filter nominal sizes 20 time of designs, enough has satisfied use situation. Only if in non- the common special environment use, only then gives the special consideration.孔目数（目数/英寸）的选择，主要考虑需拦截的杂质粒径，依据介质流程工艺要求而定。各种规格丝网可拦截的粒径尺寸查下表“滤网规格”。Hole Mesh (mesh / inch) of choice, consider the need to intercept the main impurities in diameter, according to media flow Process requirements. Various specifications of wire to intercept the particle size can search under the table filter specifications.Mesh specification不锈钢丝网的技术特性Stainless steel wool technical characteristic一般金属丝网的技术特性Generally gauzes technical characteristic孔目数目英寸Hole item of number Inch丝径mmSilk diametermm可拦截的粒径umMay intercept有效面积%Particle sizeum孔目数目英寸Hole item of number Inch丝径mmSilk diametermm可拦截的粒径umMay intercept有效面积%Particle sizeum100.508203264100.559198161120.475160061120.457166061140.376143863140.367143863160.315127365160.315127365180.315109661180.315109661200.27395557200.27499662220.23488259220.27488159240.23478556240.25480458260.23474359260.23474359280.23467356280.23467356300.23461453300.23461453320.23456050320.21358154360.23447246360.21353452380.23445546380.21349350400.193442494001523565050012230151600.12230151800.10221647800.102216471000.081173461000.08174501200.081131381200.0714250(1) 金属材料温度适用范围Temperature scope of application of metallic materials铸铁Cast iron10200 碳钢Carbon steel20400低合金钢Low-alloy structural steel40400 不锈钢Stainless steel190400(2) 辅助密封材料温度适用范围Auxiliary seal material temperature applicable scope丁晴橡胶NBR30100 氟橡胶fluoroelastomers30150石棉板graphite 300 石墨金属缠绕垫Metal wound pad650公称压力：按照过滤管路可能出现的最高压力确定过滤器的压力等级，也可通过技术协议要求，考虑进出口管路的统一性，选择与出口管路中最高压力相匹配的压力等级过滤器.实际适用最高压力与介质湿度关系如下：Nominal pressure: Inaccordance with the filter pipe maximum pressure that may arise to determine the pressure of grading filters can also pass Have the technical requirements in the agreement, to consider the unity of the import and export pipelines, select and export pipeline to match the highest pressure The pressure of grading filters. The practical application of the maximum pressure and humidity of the relationship between media are as follows: P - filters can bear the maximum working pressure MpaP 过滤器所能承受的最高工作压力The filter can withstand highest working pressure MpaP过滤器的公称压力Filters nominal pressureMpaT过滤器使用工作温度（应考虑裕度）The filter use operating temperature (should consider allowance)T温度偏差Temperature deviation TT200K强度减弱系数Intensity rejection ratioMpa/K 值按如下原则选取K value according to the following principle selection:工作温度Operating temperature200K0；铸铁过滤器Cast iron filter（200300），K00.004；碳钢过滤器Carbon steel filter（200400），K0.001