EP1469269A1 - Verfahren zur Leistungssteigerung eines Fallstromröhrenwärmetauschers - Google Patents

Verfahren zur Leistungssteigerung eines Fallstromröhrenwärmetauschers Download PDF

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Publication number
EP1469269A1
EP1469269A1 EP03009071A EP03009071A EP1469269A1 EP 1469269 A1 EP1469269 A1 EP 1469269A1 EP 03009071 A EP03009071 A EP 03009071A EP 03009071 A EP03009071 A EP 03009071A EP 1469269 A1 EP1469269 A1 EP 1469269A1
Authority
EP
European Patent Office
Prior art keywords
tube bundle
heat exchanger
tube
chamber
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Withdrawn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
EP03009071A
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English (en)
French (fr)
Inventor
Federico Zardi
Paolo Sticchi
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.)
Casale SA
Original Assignee
Urea Casale SA
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 Urea Casale SA filed Critical Urea Casale SA
Priority to EP03009071A priority Critical patent/EP1469269A1/de
Priority to CNA2004100335730A priority patent/CN1540274A/zh
Publication of EP1469269A1 publication Critical patent/EP1469269A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F28D3/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium flows in a continuous film, or trickles freely, over the conduits
    • F28D3/04—Distributing arrangements
    • 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
    • F28D3/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium flows in a continuous film, or trickles freely, over the conduits
    • F28D3/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium flows in a continuous film, or trickles freely, over the conduits with tubular conduits

Definitions

  • the present invention relates to a tube bundle heat exchanger, with vertical tubes, useful for carrying out heat exchange between two fluids, with the so-called descending film technique.
  • one of said fluids falls down along the inner wall of the tubes, without filling them, forming a thin film which leaves a rather large empty space at the centre of the tubes themselves and for their entire length; the other fluid circulates in the exchanger coming in contact with the outer wall of each single tube of the tube bundle being considered.
  • this invention relates to a method for increasing the heat exchange surface and, thus, the potentiality of a tube bundle heat exchanger of the above mentioned type.
  • devices are used, variously named after their main function, such as, for example: concentrators, evaporators, condensers, etc.; anyway, all of them are essentially consisting of or comprise a descending film tube bundle heat exchanger with vertical tubes.
  • An exchanger of the aforesaid type comprises a mantle having a vertical axis, closed at its opposite ends by respective walls or base plates, a tube bundle longitudinally supported in said mantle through tube plates, respectively upper and lower, circumferentially fixed to said mantle in a gas-tight manner. Due to the presence of said tube plates, in the heat exchanger three chambers are defined, axially arranged the one after the other; a first chamber, between the closed upper end of the mantle and the upper tube plate; a second chamber, between the tube plates and a third chamber, between the lower tube plate and the lower closed end of the mantle.
  • the liquid solution to be concentrated is fed into the first chamber and from there in the single tubes of the tube bundle, externally impinged on by the second heat exchange fluid, whereas in the third chamber, the concentrated solution is discharged.
  • the installation of particular liquid distributors also called ferules, is provided, one for each tube in the tube bundle, which have the task of forming a liquid head in said first chamber and of feeding such liquid in the individual tubes, tangentially to their inner wall.
  • the upper chamber of the heat exchangers taken here into consideration, will be named as “distribution chamber" in the following description and attached claims.
  • the prior art teaches either to use other film heat exchangers of the type considered, preferably associating them in parallel with the existing one, or to completely replace the heat exchanger with a new one of suitably increased size in order to have an increased heat exchange area; in the first case it is at least necessary to proceed with a substantial higher complexity of the configuration of the chemical plant into which the exchangers need to be installed; in the second case, remarkably increased costs need to be borne both as investment and operating costs.
  • the problem underlying the present invention is that of providing a method for increasing the production capacity (potentiality) of a tube bundle heat exchanger of the so-called descending film type, suitable for overcoming, in a simple and cost-effective manner, all the drawbacks mentioned with reference to the prior art.
  • a heat exchanger 1 of the so-called descending film type comprises, according to the prior art, a mantle 2, with a vertical axis A-A, closed at the opposite ends by respective upper 3 and lower 4 walls or bottoms, fixed thereto through respective flanges 3a, 4a; a tube bundle 5, with vertical tubes 5a, is longitudinally mounted in said mantle 2, with respective upper and lower tube plates 6, 7 circumferentially fixed in a gas-tight manner to the mantle itself.
  • three chambers 8, 9 and 10 are defined, axially arranged the one after the other; the first chamber 8, lays between the upper bottom 3 and the upper tube plate 6; the second chamber 9 between the tube plates 6, 7 of said bundle 5, whereas the third chamber 10 lays between the lower tube plate 7 and the lower bottom 4 of said mantle 2.
  • the first chamber 8 (distribution chamber) is in fluid communication with the outside through a duct 11, provided for the feeding of a solution to be concentrated;
  • the second chamber 9, or intermediate chamber is in communication with the outside of the mantle 2 through an upper duct 13, for feeding into said chamber a second heat exchange fluid, for example steam at a predetermined temperature, useful for carrying out the desired concentration of the aforesaid solution;
  • a second heat exchange fluid for example steam at a predetermined temperature, useful for carrying out the desired concentration of the aforesaid solution;
  • a lower duct 12 provides for discharging from said second chamber 9 the second heat exchange fluid;
  • the third chamber 10 which is a kind of collection reservoir for the concentrated solution, in communication with the outside through a duct 14 for discharging said solution.
  • the upper bottom 3 is equipped with a duct 39 for discharging the possible vapors produced by the tube bundle 5.
  • tubes 5a of the tube bundle 5 have flared and/or welded end portions into the respective tube plates 6, 7 and open into the distribution chamber 8 and in the third chamber 10, respectively, which, thus, are in fluid communication with each other.
  • each distributor 15, also called ferule essentially consists of a crop end of tube 16, of a predetermined length, having one end 16a gas tightly engaged in the mouth of a respective tube 5a, and the other end 16b, free and open into said chamber 8.
  • said crop end of tube 16 is equipped with one or more radial through holes 17, whose distance from the tube plate 6 is predetermined according to the liquid head (solution to be concentrated) which one wishes to maintain inside the distribution chamber 8.
  • the method according to the present invention provides for the use of a heat exchange module 21 (fig. 2).
  • such module 21 comprises a cylindrical tubular casing 22, open at is opposite ends and having an outer diameter equal to the diameter of the mantle 2 of the heat exchanger 1.
  • a tube bundle 25, with parallel tubes 25a is longitudinally supported in said tubular casing 22, by the tube plates 26 and 27 themselves, circumferentially fixed, in a fluid-tight arrangement, in said casing 22, in a predetermined distanced relationship from the open ends thereof.
  • a chamber 29 is defined, in fluid communication with the outside through two ducts 32, 33.
  • the heat exchange module 21 thus arranged is connected in an axial alignment with the heat exchanger 1, in a head-tail arrangement, so as to form a single body with it (figure 3) in which the tube bundles 5 and 25 are in a mutual predetermined distanced relationship.
  • a chamber 10-28 is defined, which is, at the same time, chamber for receiving partially concentrated solution coming out of the tubes 5a and distribution chamber of said solution for the tube bundle 25, as will be clearer from the following description.
  • the lower bottom 4 of the exchanger 1 is then installed onto the lower free end of the tubular casing 22 (flange 22b), forming with the tube plate 27 thereof, a lower chamber, intended to receive the solution concentrated to the desired value.
  • a single new heat exchanger 1-21 is obtained (fig. 3) with a double tube bundle 5-25, with vertical tubes 5a-25a and in its whole of the falling flow type. Therefore, an exchanger 1-21 is obtained having a heat exchange surface doubled with respect to the exchanger 1 or, at least, a heat exchange surface increased by the heat exchange surface assigned, at the design stage, to the tube bundle 25 of the tubular casing 22. And the increase of potentiality (or productivity) is directly linked to this increase of heat exchange surface.
  • a plurality of ferules is active, one for each tube 25a of the tube bundle 25.
  • the radial through holes 37 of such ferules 36 are at a distance from said tube plate 26, predetermined according to a pre-calculated liquid head, which is wished to be maintained inside the distribution chamber 28.
  • This liquid head is maintained substantially constant by the solution (already partially concentrated) which, according to a further feature of the present invention, is freely fed into said distribution chamber 28, by the force of gravity ("it rains"), from the tubes 5a of the tube bundle 5 laying above it.
  • said ferules 36 are closed on the top (fig. 5), whereas they are provided with radial apertures 40, in positions suitable for allowing the gaseous flow possibly freed from the tube bundle 25 to exit.
  • the main advantage achieved by the method of the present invention lays in the fact that it manages to increase the productive capacity (potentiality) of a tube bundle heat exchanger of the so-called descending film type in a simple and cost-effective way, without carrying out substantial changes onto the existing structure and arrangement of the chemical plant into which such exchanger is installed.

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  • 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)
EP03009071A 2003-04-18 2003-04-18 Verfahren zur Leistungssteigerung eines Fallstromröhrenwärmetauschers Withdrawn EP1469269A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP03009071A EP1469269A1 (de) 2003-04-18 2003-04-18 Verfahren zur Leistungssteigerung eines Fallstromröhrenwärmetauschers
CNA2004100335730A CN1540274A (zh) 2003-04-18 2004-04-06 增加下降薄膜管束式热交换器的潜力的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03009071A EP1469269A1 (de) 2003-04-18 2003-04-18 Verfahren zur Leistungssteigerung eines Fallstromröhrenwärmetauschers

Publications (1)

Publication Number Publication Date
EP1469269A1 true EP1469269A1 (de) 2004-10-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP03009071A Withdrawn EP1469269A1 (de) 2003-04-18 2003-04-18 Verfahren zur Leistungssteigerung eines Fallstromröhrenwärmetauschers

Country Status (2)

Country Link
EP (1) EP1469269A1 (de)
CN (1) CN1540274A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120007067A (ko) * 2009-05-06 2012-01-19 사이펨 에스.피.에이. 액체 흐름 조절기 요소들을 포함하는 튜브 번들 설비
EP4261204A1 (de) 2022-04-13 2023-10-18 Yara International ASA Fallfilmwärmetauscher

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12228349B2 (en) * 2018-02-20 2025-02-18 K&N Engineering, Inc. Modular intercooler block
CN109764569B (zh) * 2018-12-28 2021-05-18 哈电集团（秦皇岛）重型装备有限公司 结构可扩展的制冷器及其制造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2498752A (en) * 1944-12-30 1950-02-28 Du Pont Tubular falling-film exchanger
DE899795C (de) * 1949-06-08 1953-12-17 Hoechst Ag Vorrichtung zum Waermeaustausch
US4305455A (en) * 1979-02-28 1981-12-15 Lipets Adolf U Multipass corrosion proof air heater
JPS5717403A (en) * 1980-07-07 1982-01-29 Tokai Carbon Co Ltd Manufacturing apparatus for synthetic hydrochloric acid
DE3639303A1 (de) * 1986-05-20 1987-11-26 Leipzig Chemieanlagen Rohrbuendelapparate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2498752A (en) * 1944-12-30 1950-02-28 Du Pont Tubular falling-film exchanger
DE899795C (de) * 1949-06-08 1953-12-17 Hoechst Ag Vorrichtung zum Waermeaustausch
US4305455A (en) * 1979-02-28 1981-12-15 Lipets Adolf U Multipass corrosion proof air heater
JPS5717403A (en) * 1980-07-07 1982-01-29 Tokai Carbon Co Ltd Manufacturing apparatus for synthetic hydrochloric acid
DE3639303A1 (de) * 1986-05-20 1987-11-26 Leipzig Chemieanlagen Rohrbuendelapparate

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 085 (C - 103) 22 May 1982 (1982-05-22) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120007067A (ko) * 2009-05-06 2012-01-19 사이펨 에스.피.에이. 액체 흐름 조절기 요소들을 포함하는 튜브 번들 설비
JP2012526259A (ja) * 2009-05-06 2012-10-25 サイペム・ソシエタ・ペル・アチオニ 液体流れの調節要素を備えた管束設備
EP4261204A1 (de) 2022-04-13 2023-10-18 Yara International ASA Fallfilmwärmetauscher
WO2023198802A1 (en) 2022-04-13 2023-10-19 Yara International Asa A falling film heat exchanger

Also Published As

Publication number Publication date
CN1540274A (zh) 2004-10-27

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