EP1519134A2 - Echangeur de chaleur - Google Patents

Echangeur de chaleur Download PDF

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Publication number
EP1519134A2
EP1519134A2 EP04022410A EP04022410A EP1519134A2 EP 1519134 A2 EP1519134 A2 EP 1519134A2 EP 04022410 A EP04022410 A EP 04022410A EP 04022410 A EP04022410 A EP 04022410A EP 1519134 A2 EP1519134 A2 EP 1519134A2
Authority
EP
European Patent Office
Prior art keywords
tube
nest
exchanger
bypass
tubes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04022410A
Other languages
German (de)
English (en)
Other versions
EP1519134A3 (fr
Inventor
Luca Zanardi
Pierluigi Ricci
Gaetano Galatello Adamo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alfa Laval Olmi SpA
Original Assignee
Olmi SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Olmi SpA filed Critical Olmi SpA
Publication of EP1519134A2 publication Critical patent/EP1519134A2/fr
Publication of EP1519134A3 publication Critical patent/EP1519134A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/087—Heat exchange elements made from metals or metal alloys from nickel or nickel alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/06—Derivation channels, e.g. bypass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2270/00—Thermal insulation; Thermal decoupling

Definitions

  • the present invention relates to a heat exchanger with improved structural characteristics.
  • an exchanger of the type with tube plates and with tube nest arranged between the plates and with process fluid output temperature control is described.
  • This structure realizes known exchangers for example with the name 'Waste Heat Boiler' or 'Process Gas Cooler'.
  • Use is generally for the realization of steam generators for various plants (ammonium, methanol, hydrogen etc) for which process gas output temperature control is required.
  • Said control is obtained by means of a bypass tube carrying the gas in variable proportion from the exchanger input directly to its output.
  • a controlled valve adjusts the quantity of process gas passing through the bypass so as to regulate the desired exchanger output fluid temperature.
  • bypass tube must be insulated thermally inside for metallurgical reasons and hence its external shell in contact with the water constituting the exchange fluid circulating in the exchanger takes on a temperature very close to that of the fluid on the jacket side.
  • bypass duct is realized with the same material as the other tubes of the nest. But being cold in normal operation as compared with the exchange tubes of the tube nest, it lengthens less as compared with the tubes of the nest. Thus tensions are created on the weld between the tube and the tube-nest in the zone contiguous to the bypass. The stress is the higher the longer tubes. This involves among other things a limit to the length of the tubes usable and hence to the efficiency and economic character of the exchanger.
  • the general purpose of the present invention is to remedy the above-mentioned shortcomings by making available an exchanger with improved structure in a simple and economical manner allowing greatly reducing the stresses produced by the bypass duct and the incidence of the length of the tubes on the stresses produced by the bypass duct so as to be able also to realize exchangers with longer and therefore more economical tubes.
  • a tube-nest heat exchanger with bypass for process fluid output temperature control comprising a chamber traversed by an exchange fluid and closed at opposite ends by a pair of tube plates with a tube nest between them and the tube-nest tubes being traversed by the process fluid and being in contact externally with the exchange fluid in the chamber with there being between the tube plates in addition at least one bypass tube made up of an external shell in contact with the exchange fluid and a thermally insulating layer on the inner wall to surround an internal passage traversed by the process fluid so that under operating conditions when the tube-nest tubes are at a first average temperature T et the external shell of the bypass tube is at a second average temperature T eb lower than the first, characterized in that the material of the external shell of the bypass tube and the material of the tube-nest tubes are mutually different and chosen with different thermal expansion coefficients such that the functions ⁇ L t (T) and ⁇ L b (T) of the lengthening starting from the
  • FIG 1 shows a heat exchanger indicated as a whole by reference number 10 and having a tube nest 11 between tube plates 12 and 13.
  • the pair of plates closes a chamber 14 traversed by an exchange fluid 15 while the tubes of the tube nest 11 are traversed by the process fluid 16 and are in contact externally with the exchange fluid in the chamber.
  • the exchanger also comprises a bypass 17 for control of process fluid output temperature.
  • Said bypass 17 comprises in turn an external shell 18 in contact with the exchange fluid and a thermally insulating layer 19 on the internal wall to surround an internal passage 20 traversed by the process fluid.
  • T et first average temperature
  • T eb second average temperature
  • the internal passage 20 of the bypass traversed by the process fluid can be advantageously separated from the thermally insulating layer by means of an internal duct 21. This allows protecting the insulating material from the aggressive action of the process fluid. If the internal duct 21 is used, it can be realized with a known telescopic union 22 so as to allow appropriate lengthenings caused by its linear expansion.
  • the bypass tube has advantageously a mouth at its process fluid output end equipped with a known adjustable valve 23 for flow choking.
  • the material of the external shell 18 of the bypass tube and the material of the tube-nest tubes 11 are mutually different and are chosen with different thermal expansion coefficients.
  • two functions ⁇ L t (T) and ⁇ L b (T) of the lengthening can be defined as a function of temperature respectively of the tube-nest tubes and of the bypass tube shell starting from the length which they have under rest condition, i.e. under assembly conditions. Under these conditions the stress can be considered minimal.
  • the curves of the two functions (ideally two straight lines) intersect mutually at assembly temperature T M (for example at surrounding temperature of 25°C).
  • the inclination of the two straight lines is a function of the linear expansion coefficients of the two materials chosen and of the length of the tubes at rest.
  • the materials of the tubes must be chosen with expansion coefficients such that the above-mentioned functions ⁇ L t (T) and ⁇ L b (T) identify at said mean operating temperatures T et and T eb of tubes and bypass values ⁇ L t (T et ) and ⁇ L b (T eb ) such that
  • ⁇ x with at most equal to 0.15.
  • x be at most 0.07 and expediently not over 0.05.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP04022410A 2003-09-24 2004-09-21 Echangeur de chaleur Withdrawn EP1519134A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20031826 2003-09-24
IT001826A ITMI20031826A1 (it) 2003-09-24 2003-09-24 Scambiatore di calore e struttura perfezionata.

Publications (2)

Publication Number Publication Date
EP1519134A2 true EP1519134A2 (fr) 2005-03-30
EP1519134A3 EP1519134A3 (fr) 2008-02-20

Family

ID=34179332

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04022410A Withdrawn EP1519134A3 (fr) 2003-09-24 2004-09-21 Echangeur de chaleur

Country Status (2)

Country Link
EP (1) EP1519134A3 (fr)
IT (1) ITMI20031826A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009048592A1 (de) * 2009-10-07 2011-04-14 Lurgi Gmbh Abhitzekessel und Verfahren zur Abkühlung von Synthesegas
CN102338572A (zh) * 2010-07-26 2012-02-01 济南西斯普换热系统有限公司 无菌双管板管壳式换热器
CN103471431A (zh) * 2013-09-26 2013-12-25 上海锅炉厂有限公司 一种具有控温功能固定管板式换热器
CN103471432A (zh) * 2013-09-26 2013-12-25 上海锅炉厂有限公司 一种具有控温功能双螺旋板式固定管板换热器
CN103486881A (zh) * 2013-09-26 2014-01-01 上海锅炉厂有限公司 一种具有控温功能双螺旋折流板式浮头换热器
CN105202949A (zh) * 2015-10-15 2015-12-30 上海锅炉厂有限公司 可控温自冷却保护高温u型管蒸发器
DE102014222158A1 (de) * 2014-10-30 2016-05-04 Mahle International Gmbh Abgaswärmeübertrager
CN110332829A (zh) * 2019-04-03 2019-10-15 新乡北新建材有限公司 一种石膏板新型换热器结构
US11073347B2 (en) 2017-05-26 2021-07-27 Alfa Laval Olmi S.P.A. Shell-and-tube equipment with bypass

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2091003A (en) * 1936-03-14 1937-08-24 J P Devine Mfg Co Inc Heat exchange apparatus
GB758030A (en) * 1953-02-20 1956-09-26 Exxon Research Engineering Co Improvements in or relating to tubular heat exchangers
US3570545A (en) * 1967-09-29 1971-03-16 Benteler Werke Ag Insulated tube and method of making the same
DE2846455B1 (de) * 1978-10-23 1979-10-31 Borsig Gmbh Rohrbuendel-Waermetauscher mit gleichbleibender Austrittstemperatur eines der beiden Medien
WO2002052142A1 (fr) * 2000-12-19 2002-07-04 Valeo Termico Sa Module echangeur de chaleur, specialement concu pour un systeme de recyclage des gaz d'echappement
EP1288603A2 (fr) * 2001-08-30 2003-03-05 Behr GmbH & Co. Echangeur de chaleur pour gaz d'échappement
WO2003062625A1 (fr) * 2002-01-26 2003-07-31 Behr Gmbh & Co. Kg Echangeur thermique de gaz d'echappement

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2091003A (en) * 1936-03-14 1937-08-24 J P Devine Mfg Co Inc Heat exchange apparatus
GB758030A (en) * 1953-02-20 1956-09-26 Exxon Research Engineering Co Improvements in or relating to tubular heat exchangers
US3570545A (en) * 1967-09-29 1971-03-16 Benteler Werke Ag Insulated tube and method of making the same
DE2846455B1 (de) * 1978-10-23 1979-10-31 Borsig Gmbh Rohrbuendel-Waermetauscher mit gleichbleibender Austrittstemperatur eines der beiden Medien
WO2002052142A1 (fr) * 2000-12-19 2002-07-04 Valeo Termico Sa Module echangeur de chaleur, specialement concu pour un systeme de recyclage des gaz d'echappement
EP1288603A2 (fr) * 2001-08-30 2003-03-05 Behr GmbH & Co. Echangeur de chaleur pour gaz d'échappement
WO2003062625A1 (fr) * 2002-01-26 2003-07-31 Behr Gmbh & Co. Kg Echangeur thermique de gaz d'echappement

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009048592A1 (de) * 2009-10-07 2011-04-14 Lurgi Gmbh Abhitzekessel und Verfahren zur Abkühlung von Synthesegas
CN102338572A (zh) * 2010-07-26 2012-02-01 济南西斯普换热系统有限公司 无菌双管板管壳式换热器
CN103471431A (zh) * 2013-09-26 2013-12-25 上海锅炉厂有限公司 一种具有控温功能固定管板式换热器
CN103471432A (zh) * 2013-09-26 2013-12-25 上海锅炉厂有限公司 一种具有控温功能双螺旋板式固定管板换热器
CN103486881A (zh) * 2013-09-26 2014-01-01 上海锅炉厂有限公司 一种具有控温功能双螺旋折流板式浮头换热器
DE102014222158A1 (de) * 2014-10-30 2016-05-04 Mahle International Gmbh Abgaswärmeübertrager
CN105202949A (zh) * 2015-10-15 2015-12-30 上海锅炉厂有限公司 可控温自冷却保护高温u型管蒸发器
US11073347B2 (en) 2017-05-26 2021-07-27 Alfa Laval Olmi S.P.A. Shell-and-tube equipment with bypass
CN110332829A (zh) * 2019-04-03 2019-10-15 新乡北新建材有限公司 一种石膏板新型换热器结构
CN110332829B (zh) * 2019-04-03 2020-07-31 新乡北新建材有限公司 一种石膏板新型换热器结构

Also Published As

Publication number Publication date
ITMI20031826A1 (it) 2005-03-25
EP1519134A3 (fr) 2008-02-20

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