阿法拉伐(换热)资料.ppt

? Alfa Laval ? Alfa Laval Alfa Laval Heat Exchangers for Ultra-Hygienic Pharmaceutical Duties阿法拉伐制药系统卫生型换热器 Sanitary Plate Heat Exchangers Working principle of a PHE 板式换热器的工作原理 PHE - main components主要组成 PHE - dismantling Plate Heat Exchanger Plate pack - example single pass Only 2 plates that do not transfer heat - the end plates Plate - distribution area Chocolate pattern Distributes flow evenly over the plate Plate - corrugation and channels Plate - corrugation and channels Plate Pattern Herring bone Contact points Mechanical Strength Flow pattern Cork screw High turbulence NUMBER OF PLATES DEPENDS ON:板片数取决于 Flow rates 流量 Permitted pressure drops 允许的压力降 Temperature program 温差 Size design of plates 板型 Heat recovery 热回收 Material thickness of plates 材质和板厚 Physical properties 物料性质 Plate - parallel vs diagonal flow Parallel flow advantages One plate one gasket Identical plates in the plate pack Rotated 180o to achieve both sides Less spares required Fully supported diagonal Higher design pressure or thinner plate material No crossing of nozzles Plate - materials Standard materials and thicknesses AISI 304 (stainless steel) Usually 0.4 or 0.5 mm thickness Cheapest possible solution AISI 316 (stainless steel) Always 0.5 and 0.6 mm Some with thicker plates (high-pressure applications) 254 SMO (high-alloy stainless steel) Usually in 0.6 mm to allow stock-keeping Titanium Always 0.5 and 0.6 mm Some with thicker plates (high-pressure applications) Some PHEs with 0.4 mm (low-pressure applications) Alloy C-276 (Nickel alloy) Usually in 0.6 mm to allow stock-keeping GasketsPurpose The purpose of the gaskets is to seal between the channel plates and between plates and the frame parts (connecting plate). Are the only wear part (the ageing of rubber). Gasket - double sealing system Special venting ports are an integral part of the gasket design to prevent cross contamination GasketsStandard Nitrile: NBRP = (performance) up to 130°C, Food grade NBRB = (base) inexpen