EP0290813B1 - Heat exchanger, especially for cooling cracked gases - Google Patents

Heat exchanger, especially for cooling cracked gases Download PDF

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Publication number
EP0290813B1
EP0290813B1 EP88106024A EP88106024A EP0290813B1 EP 0290813 B1 EP0290813 B1 EP 0290813B1 EP 88106024 A EP88106024 A EP 88106024A EP 88106024 A EP88106024 A EP 88106024A EP 0290813 B1 EP0290813 B1 EP 0290813B1
Authority
EP
European Patent Office
Prior art keywords
tube
cooling
heat exchanger
gas
sleeve
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.)
Expired - Lifetime
Application number
EP88106024A
Other languages
German (de)
French (fr)
Other versions
EP0290813A1 (en
Inventor
Peter Brücher
Helmut Lachmann
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.)
Deutsche Babcock Borsig AG
Original Assignee
Deutsche Babcock Borsig AG
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
Priority to DE3715713A priority Critical patent/DE3715713C1/en
Priority to DE3715713 priority
Application filed by Deutsche Babcock Borsig AG filed Critical Deutsche Babcock Borsig AG
Publication of EP0290813A1 publication Critical patent/EP0290813A1/en
Application granted granted Critical
Publication of EP0290813B1 publication Critical patent/EP0290813B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/22Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02Header boxes; End plates
    • F28F9/0229Double end plates; Single end plates with hollow spaces
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0075Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for syngas or cracked gas cooling systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/22Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
    • F28F2009/222Particular guide plates, baffles or deflectors, e.g. having particular orientation relative to an elongated casing or conduit
    • F28F2009/226Transversal partitions

Description

  • The invention relates to a heat exchanger, in particular for cooling cracked gases according to the preamble of claims 1 and 2.
  • The fission gases formed by thermal cracking of hydrocarbons are cooled very quickly to stabilize their molecular composition. This is done by indirect heat transfer from the cracked gas to the heat-absorbing medium in cracked gas coolers. The cracked gas is passed through pipes which are surrounded by evaporating water as a cooling medium. The evaporating water provides intensive cooling of the pipes, which means that the wall temperature is relatively low and is only slightly above the temperature of the evaporating water. The cracked gas is a mixture of hydrocarbons of different molecular weights and partial pressures. During cooling in the cracked gas cooler, the condensation temperature can be fallen below for some of the components. As a result, these components are precipitated on the pipe wall in the area of low temperatures and a so-called coke layer is built up. This coke layer increases the flow resistance, which increases the gas pressure in the upstream cracking furnace. This results in poorer fission gas yield, a further increase in the coke layer, rising gas outlet temperature and lower steam generation. After a certain operating time, the cracked gas cooler must be taken out of operation to remove the coke layer.
  • In a heat exchanger known from US-A-38 02 497 for cooling cracked gas and other gases, the outlet-side end of the gas-carrying pipes is surrounded by an outer pipe which is open to the atmosphere in order to reduce the formation of the coke layer. In this way, a layer of still air forms between the gas-carrying pipe and the outer pipe. The arrangement of such a double tube prevents the heat emission so much that the cooling of the cracked gases is insufficient.
  • A heat exchanger is known from US Pat. No. 3,547,188, the tubes of which are surrounded by a cladding tube over almost the entire length. The entire flow of the heat exchange medium is conducted through the annular spaces thus formed. It is ensured that a turbulent flow occurs in the annular spaces in order to achieve good heat transfer on the pipe surface.
  • The invention has for its object to design the generic heat exchanger such that the cooling effect at the outlet end of the gas-carrying pipes is reduced to the extent that the risk of the formation of a coke layer is largely avoided.
  • This object is achieved in a generic heat exchanger by the characterizing features of claims 1 or 2. An advantageous embodiment of the invention is specified in claim 3.
  • In the heat exchanger according to the invention, the wetting of the rear pipe end with cooling medium is reduced. This makes the cooling effect less intense, so that the temperature on the inner wall of the gas-carrying pipe is above the condensation temperature of the cracked gas components. By changing the gap width between the gas-carrying pipe and the surrounding sleeve pipe and by changing the thickness or density of the wire mesh, the degree of cooling can be changed and the heat exchanger can thus be adapted to the operating requirements.
  • Several embodiments of the invention are shown in the drawing and are explained in more detail below. Show it:
    • 1 shows a longitudinal section through a heat exchanger according to the invention,
    • Fig. 2 shows the detail Z of FIG. 1 and
    • Fig. 3 shows the detail Z according to another embodiment.
  • The heat exchanger shown is of a standing type and is used in particular for cooling cracked gas with the help of evaporating water under excess pressure. It consists of a tube bundle composed of individual tubes 1, through which the gas to be cooled flows and which are surrounded by a jacket 2. The tubes 1 are held in two tube plates 3, 4, to which a gas inlet chamber 5 and a gas outlet chamber 6 are connected.
  • The thin tube plate 3 on the gas inlet side is on the Supported gas inlet chamber 5 side supported by a support plate 7 which is arranged to form a space 8 at a distance from the thin tube plate 3. Between the thin tube plate 3 and the support plate 7, support fingers 9 are provided distributed over the cross section and are molded onto the support plate 7. The tubes 1 each penetrate loosely through the support plate 7, forming an annular gap. The thin tube plate 3 is connected to an outer ring jacket 10 and the support plate 7 is connected to an inner ring jacket 11. The ring jackets 10, 11 are connected to one another and delimit an annular chamber 12 into which an inlet connection 13 for the supply of the water serving as a cooling medium. The upper part of the jacket 2 is provided with an outlet connection 14 for the removal of the cooling medium.
  • The end of the tubes 1 facing the gas outlet chamber 6 is enclosed by a sleeve. 1 and 2, the sleeve consists of a sleeve tube 15 which is open on both sides and which surrounds the tube 1 at a distance, forming an annular gap. To maintain the gap width, the sleeve tube 15 is supported on the tube 1 via cams 16. The sleeve tubes 15 are held in locking washers 17, which are arranged within the jacket 2 perpendicular to the axis thereof and which are intended to prevent the tubes 1 from vibrating. The length of the sleeve tube 15 is adapted to the operating requirements and ends shortly before the tube plate 4 lying on the gas outlet side.
  • The width of the annular gap between the tube 1 and the sleeve tube 15 is dimensioned so large that the boiling water present in the interior of the jacket 1 is prevented from flowing into the annular gap in an amount sufficient for complete wetting. The resulting reduced or prevented wetting of the tube 1 with boiling water causes a reduced heat transfer from the heat-emitting to the heat-absorbing medium and thereby the desired less intensive cooling. This less intensive cooling causes a higher pipe wall temperature, which means that no or fewer hydrocarbons condense. The result is that coke formation is prevented or at least reduced.
  • The reduction in the cooling effect can be influenced by changing the gap width. Furthermore, openings 18 can be provided in the wall of the sleeve tube 15, through which boiling water can penetrate into the annular gap and thus increase the cooling effect again.
  • The invention can be used both in shell-and-tube heat exchangers (FIGS. 1 and 2) and in double-tube heat exchangers. A section of such a double tube heat exchanger is shown in FIG. 3. In this heat exchanger, each gas-carrying pipe 1 is surrounded by an outer pipe 19 to form an annular space. The annular space is connected to an inlet and an outlet chamber 20, which is common to a number of double pipes.
  • The end of a gas-carrying pipe 1 facing the outlet chamber 20 can, as described, be enclosed by a sleeve tube 15 which ends shortly before the outlet chamber 20 or protrudes a little into it. 3 shows a different type of sheathing of the gas-carrying pipe 1, which can optionally also be used in the shell-and-tube heat exchanger according to FIGS. 1 and 2. This sheath consists of a wire mesh 21, which is drawn like a sock over the tube 1. The wire mesh 21 reduces wetting of the gas-carrying pipe 1 on the endangered pipe length in the same way as the sleeve pipe 15.

Claims (3)

1. Heat exchanger, for the cooling of cracking gases with the aid of boiling water as cooling medium, consisting of tubes (1), which are flowed through by the gas to be cooled and surrounded by a cooling jacket (2) flowed through by the cooling medium, wherein each tube (1) is enclosed by a sleeve flowed through by the cooling medium, characterised thereby, that the sleeve surrounds the tube (1) only at the end facing the gas exit and consists of a sleeve tube (15), which is open at both ends and arranged at a spacing from the tube (1) while forming an annular gap, and that the annular gap is so dimensioned that the boiling water is prevented from flowing into the annular gap in a quantity sufficient for the complete wetting of the tube (1).
2. Heat exchanger, for the cooling of cracking gases with the aid of boiling water as cooling medium, consisting of tubes (1), which are flowed through by the gas to be cooled and surrounded by a cooling jacket (2) flowed through by the cooling medium, wherein each tube (1) is enclosed by a sleeve flowed through by the cooling medium, characterised thereby, that the sleeve surrounds the tube (1) only at the end facing the gas exit and consists of a wire gauze (21), which rests on the tube (1) and is so dimensioned that the boiling water is prevented from flowing through the wire gauze (21) in a quantity sufficient for the complete wetting of the tube (1).
3. Heat exchanger according to claim 1, characterised thereby, that the wall of the sleeve tube (15) is provided with passages (18).
EP88106024A 1987-05-12 1988-04-15 Heat exchanger, especially for cooling cracked gases Expired - Lifetime EP0290813B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3715713A DE3715713C1 (en) 1987-05-12 1987-05-12 Heat exchanger in particular for cooling cracked gases
DE3715713 1987-05-12

Publications (2)

Publication Number Publication Date
EP0290813A1 EP0290813A1 (en) 1988-11-17
EP0290813B1 true EP0290813B1 (en) 1991-03-06

Family

ID=6327298

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106024A Expired - Lifetime EP0290813B1 (en) 1987-05-12 1988-04-15 Heat exchanger, especially for cooling cracked gases

Country Status (4)

Country Link
US (1) US4858684A (en)
EP (1) EP0290813B1 (en)
JP (1) JPS63297995A (en)
DE (1) DE3715713C1 (en)

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DE3822808C2 (en) * 1988-07-06 1993-12-23 Balcke Duerr Ag Heat exchanger with heat exchanger tubes arranged between two tube plates
DE3913731A1 (en) * 1989-04-26 1990-10-31 Borsig Gmbh Heat exchanger for cooling fuse gas
DE3930205A1 (en) * 1989-09-09 1991-03-14 Borsig Babcock Ag Tube bunch heat exchanger
DE4404068C1 (en) * 1994-02-09 1995-08-17 Wolfgang Engelhardt Heat exchanger
DE4407594A1 (en) * 1994-03-08 1995-09-14 Borsig Babcock Ag Heat exchanger for cooling hot reaction gas
MY114772A (en) * 1994-07-05 2003-01-31 Shell Int Research Apparatus for cooling hot gas
DE4445687A1 (en) * 1994-12-21 1996-06-27 Borsig Babcock Ag Heat exchanger for cooling cracked gas
CA2191379A1 (en) * 1995-11-28 1997-05-29 Cuddalore Padmanaban Natarajan Heat exchanger for use in high temperature applications
GB2319333B (en) * 1996-11-11 2000-08-09 Usui Kokusai Sangyo Kk EGR Gas cooling apparatus
CA2424767C (en) * 2002-04-23 2010-12-21 Exxonmobil Research And Engineering Company Improved heat exchanger with floating head
US20050135978A1 (en) * 2003-10-14 2005-06-23 Mourad Hamedi Method and apparatus for optimizing throughput in a trickle bed reactor
KR20080091233A (en) * 2006-01-19 2008-10-09 도요 세이칸 가부시키가이샤 Coupler and fuel cartridge for fuel cell
DE102006003317B4 (en) 2006-01-23 2008-10-02 Alstom Technology Ltd. Tube bundle heat exchanger
US9557119B2 (en) 2009-05-08 2017-01-31 Arvos Inc. Heat transfer sheet for rotary regenerative heat exchanger
US8672021B2 (en) 2010-02-12 2014-03-18 Alfred N. Montestruc, III Simplified flow shell and tube type heat exchanger for transfer line exchangers and like applications
RU2451888C2 (en) * 2010-05-26 2012-05-27 Российская Федерация, от имени которой выступает Министерство промышленности и торговли Российской Федерации (Минпромторг России) Vertical shell-and-tube evaporator with overheater
US8813688B2 (en) * 2010-12-01 2014-08-26 Aic S.A. Heat exchanger
PL216290B1 (en) * 2010-10-01 2014-03-31 Aic Społka Akcyjna Heat exchanger
US9200853B2 (en) 2012-08-23 2015-12-01 Arvos Technology Limited Heat transfer assembly for rotary regenerative preheater
US20140352931A1 (en) * 2013-05-31 2014-12-04 Steve Turner Corrosion Resistant Air Preheater with Lined Tubes
JP5941878B2 (en) * 2013-07-25 2016-06-29 株式会社ユタカ技研 Heat exchanger and heat exchange device
US10175006B2 (en) 2013-11-25 2019-01-08 Arvos Ljungstrom Llc Heat transfer elements for a closed channel rotary regenerative air preheater
US10094626B2 (en) 2015-10-07 2018-10-09 Arvos Ljungstrom Llc Alternating notch configuration for spacing heat transfer sheets
EP3614053A1 (en) 2018-06-08 2020-02-26 BSH Hausgeräte GmbH Vapour extraction device and combination device with vapour extraction device and hob

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US1782435A (en) * 1926-11-09 1930-11-25 Gen Chemical Corp Apparatus for cooling fluids
US3071540A (en) * 1959-10-27 1963-01-01 Kellogg M W Co Oil feed system for fluid catalytic cracking unit
FR1275014A (en) * 1960-09-21 1961-11-03 Fives Penhoet A method of construction of elements of heat exchange between two fluids and heat exchanger device for applying said method
CH449678A (en) * 1967-06-20 1968-01-15 Bertrams Ag Hch Tube heat exchanger with liquid heat transfer
DE2008311C3 (en) * 1970-02-23 1974-03-07 Arbeitsgemeinschaft Lentjes-Rekuperator, 4000 Duesseldorf-Oberkassel
DE2218489A1 (en) * 1972-04-17 1973-10-31 Wmf Wuerttemberg Metallwaren Evaporator pipe mfr - with an outer, metal coating of fibres bonded to pipe surface
JPS5514802B2 (en) * 1976-03-09 1980-04-18
DE2913748C2 (en) * 1979-04-03 1983-09-29 Borsig Gmbh, 1000 Berlin, De
GB2053444A (en) * 1979-06-11 1981-02-04 Westinghouse Electric Corp Heat transfer tubes with heat flux limiters
US4294312A (en) * 1979-11-09 1981-10-13 Borsig Gmbh Tube-bundle heat exchanger for cooling a medium having a high inlet temperature
US4537249A (en) * 1981-02-02 1985-08-27 The United States Of America As Represented By The United States Department Of Energy Heat flux limiting sleeves
DE3411795A1 (en) * 1984-03-30 1985-10-03 Borsig Gmbh Method for operating tube bundle heat exchangers for cooling gases
DE3429522C1 (en) * 1984-08-10 1985-11-14 Uhde Gmbh Reaction pipe system of a tubular cracking furnace
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DE3533219C1 (en) * 1985-09-18 1986-11-13 Borsig Gmbh Tube bundle heat exchanger

Also Published As

Publication number Publication date
EP0290813A1 (en) 1988-11-17
DE3715713C1 (en) 1988-07-21
US4858684A (en) 1989-08-22
JPS63297995A (en) 1988-12-05

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