板翅式换热器标准Alpema Standards.pdf

i THE STANDARDS OF THE BRAZED ALUMINIUM PLATE FIN HEAT EXCHANGER MANUFACTURERS ASSOCIATION Second Edition 2000 Copyright 2000 by the Brazed Aluminium Plate Fin Heat Exchanger Manufacturers Association All rights reserved No part of this publication may be included in another publication including publications in electronic media without prior permission from ALPEMA Companies and other organisations are however welcome to make copies for use within that company or organisation Copies can be downloaded from the ALPEMA web site www alpema org When using your own copies it is in your own interest to ensure that you have the latest edition of the Standards Published by The Brazed Aluminium Plate Fin Heat Exchanger Manufacturers Association ALPEMA www alpema org ii MEMBERSHIP LIST BRAZED ALUMINIUM PLATE FIN HEAT EXCHANGER MANUFACTURERS ASSOCIATION Chart Heat Exchangers Limited Wobaston Road Fordhouses Wolverhampton WV10 6QJ England Tel 44 1902 397777 Fax 44 1902 397792 Chart Heat Exchangers Limited Partnership 2191 Ward Avenue La Crosse Wisconsin 54601 USA Tel 1 608 787 3333 Fax 1 608 787 2141 Kobe Steel Ltd Development Natural Gas Processing NGP and Liquefaction LNG the production of petrochemicals and treatment of offgases large refrigeration systems Table 1 1 gives some typical applications where brazed aluminium plate fin heat exchangers are used extensively and have proven reliable over many years of service 1 1 3 Limits of Use Maximum Working Temperature and Pressure The maximum working pressure for brazed aluminium plate fin heat exchangers varies from zero to over 100 bar g It is possible to have over ten process streams at various pressures in a single heat exchanger The maximum temperature rating is typically specified at 65 C An upper limit of 65 C is suitable for most applications and it allows manufacturers to use 5083 aluminium alloy piping which is more economical However designs are available for up to 204 C at lower pressures and design temperatures in excess of 65 C are common The minimum design temperature is 269 C See Chapter 6 for a full material listing 1 1 4 Acceptable Fluids Brazed aluminium plate fin heat exchangers are capable of handling a wide variety of fluids in many different types of applications In general fluids should be clean dry and non corrosive to aluminium Trace impurities of H2S NH3 CO2 SO2 NO2 CO Cl and other acid forming gases do not create corrosion problem in streams with water dewpoint temperatures lower than the cold end temperature of the brazed aluminium plate fin heat exchanger CHAPTER 1 General Description and Nomenclature STANDARDS OF THE BRAZED ALUMINIUM PLATE FIN HEAT EXCHANGER MANUFACTURER S ASSOCIATION 3 Under specific conditions mercury can corrode aluminium and therefore caution must be used when handling mercury containing fluids However there are many instances where brazed aluminium plate fin heat exchangers have been successfully used with fluids containing mercury provided that the proper equipment design and operating procedures are implemented In all cases it is recommended that the heat exchanger manufacturer is consulted about specific conditions Further information on corrosion guidelines is given in Section 8 3 Proper filters should be installed upstream of the exchangers to prevent plugging from particulates such as pipe scale or molecular sieve dust If a brazed aluminium plate fin heat exchanger is accidentally plugged proven cleaning procedures are available Further information on this subject is given in Section 8 2 Fluids containing compressor lube oils and other heavy hydrocarbons are acceptable provided these contaminants do not precipitate out on the fin surface In the event of heavy fouling chemical solvent cleaning of the exchanger is a proven method of cleaning Table 1 1 Plant Types and Applications Plant Types Products Length 2 Heat transfer fins 6 Headers W Width 3 Distributor fins 7 Nozzles H Height 4 Side bars 8 Block core Figure 1 2 Components of a Brazed Aluminium Plate Fin Heat Exchanger CHAPTER 1 General Description and Nomenclature STANDARDS OF THE BRAZED ALUMINIUM PLATE FIN HEAT EXCHANGER MANUFACTURER S ASSOCIATION 5 1 2 2 Components of Manifolded Exchangers Multiple brazed aluminium plate fin exchangers may be connected in parallel in series or in parallel series combination to form one assembly Figure 1 3 illustrates an assembly of three brazed aluminium plate fin heat exchangers connected in parallel For this case each individual stream enters the assembly through a manifold is distributed to the inlet nozzles on each of the three heat exchangers flows through the heat exchanger and leaves the assembly through the outlet manifold Figure 1 3 Typical Assembly of Three Brazed Aluminium Plate Fin Heat Exchangers in Parallel CHAPTER 1 General Description and Nomenclature 6 STANDARDS OF THE BRAZED ALUMINIUM PLATE FIN HEAT EXCHANGER MANUFACTURER S ASSOCIATION 1 2 3 Module Construction Two or more individually brazed aluminium p。