EP0219986A1 - Apparatus for preventing the formation of deposits on vertical heat exchanger walls - Google Patents

Apparatus for preventing the formation of deposits on vertical heat exchanger walls Download PDF

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Publication number
EP0219986A1
EP0219986A1 EP86307355A EP86307355A EP0219986A1 EP 0219986 A1 EP0219986 A1 EP 0219986A1 EP 86307355 A EP86307355 A EP 86307355A EP 86307355 A EP86307355 A EP 86307355A EP 0219986 A1 EP0219986 A1 EP 0219986A1
Authority
EP
European Patent Office
Prior art keywords
duct
wall
chain
cleaner member
elongate
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Withdrawn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
EP86307355A
Other languages
German (de)
English (en)
French (fr)
Inventor
Vagn Kollerup
Michel Albert Jadouin
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.)
Burmeister and Wain Energy AS
Original Assignee
Burmeister and Wain Energy AS
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 Burmeister and Wain Energy AS filed Critical Burmeister and Wain Energy AS
Publication of EP0219986A1 publication Critical patent/EP0219986A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G3/00—Rotary appliances
    • F28G3/06—Rotary appliances having articulated tools, e.g. assembled in chain manner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G1/00—Non-rotary, e.g. reciprocated, appliances
    • F28G1/04—Non-rotary, e.g. reciprocated, appliances having articulated tools, e.g. assembled in chain manner

Definitions

  • the present invention relates to an apparatus or appliance for preventing particulate matter entrained in a gas flowing through vertical ducts of a boiler or other heat exchanger, from accumulating in the form of unwanted deposits on the5duct walls.
  • Danish patent specification No. l29,875 discloses an apparatus for cleaning vertical fire or smoke tubes of a boiler or other heat exchanger, which apparatus comprises a sheet metal screw extending through the height of each tube with a small clearance between the inner tube wall and the peripheral edge of the screw flight.
  • Each screw is suspended from a carrier located above the associated tube and coupled to a drive mecha­nism adapted to impart a vertically reciprocating move­ment to the screw at suitable intervals. Due to the clearance within the tube the vertical movement of the screw will be accompanied by small lateral movements whereby the edge of the screw collides with the tube wall and exerts a combined impact and scraper effect on deposits present on the wall.
  • an apparatus for preventing the accumulation, on the wall of a vertical duct in a multi-duct heat exchanger, of particulate matter entrained in a gas flowing through the duct comprising an elongate cleaner member freely suspended with its axis in parallel with the wall and with a lower end protruding below the wall, said elongate cleaner member being composed of an articulated series of operative elements intercon­nected with a high degree of flexural and torsional freedom, each of said elements being formed with an operative surface extending transversely from the axis of the elongate cleaner member without physical contact with the wall, and a deflector element formed with two opposed major surfaces, the height and width of which are large in comparison with the thickness of the element, said deflector element being secured to the lower end of the elongate member adjacent its upper end at a location laterally offset from its centre of mass.
  • the apparatus according to the present invention is con­tinuously operative and it functions by influencing the gas flow along the wall in such a way that particulate matter entrained therein is kept in constant movement and thus prevented from settling down on the wall.
  • the operative elements of the elongate memter are shaped as chain links.
  • this embodi­ment is very cheap because it can be made from standard components available on the market in a large number of different sizes and at low prices, and its efficiency has been demonstrated by the above mentioned tests.
  • the dimensions of the chain links may vary along the length of the chain. It is conceivable that the varying size of the chain links results in different amplitudes of the chain's wave motion in different levels and that the gas flow pattern may be favourably influenced thereby.
  • the portion of the chain, which protrudes below the duct wall is advantageous to form the portion of the chain, which protrudes below the duct wall, from chain links which are more slender than a major part or frac­tion of the links located between the ends of the duct.
  • the amplitudes of the transverse movement of the protruding chain portion, including the deflector will be correspondingly larger than the amplitudes occurring within the duct. They may even become so large that neighbouring deflector elements collide from time to time, which may assist in keeping all chains in constant motion as long as there is a gas flow through the ducts.
  • the maximum transverse dimension of a chain link should preferably be between 25% and 40% of the diameter of the duct, e.g. about one third of the duct diameter.
  • the deflector element may be shaped as an inverted U comprising an upper, horizontal limb secured to the elongate member and two parallel vertical limbs.
  • An element of this design can be manufactured from bar stock, of round or other cross-section, by simple bending operations and it is both efficient and inexpen­sive.
  • the lengths of the vertical limbs may be unequal, which enhances the twisting effect exerted on the ele­ment by a lateral velocity component of the gas flow in the plenum chamber below the ducts.
  • An asymmetric mass distribution in the deflector may be obtained, in a simple manner, by interconnecting the vertical limts of the U-shaped deflector element by a crossbar secured to one of the major surfaces of the element.
  • the heat exchanger illustrated in the drawings includes a central furnace chamber l defined by a shell, which comprises an upper, cylindric part 2, a conical bottom part 3 and a top cover 4.
  • a fuel burner (not shown) is mounted in a central tubular member 5 of reduced diameter, extending upwardly from top cover 4.
  • a plurality of outlet tubes 6 for combustion gases pro­duced in furnace chamber l extend outwardly from the conical bottom part 3, and each tube 6 opens into a ple­num or turning chamber 7 from which a plurality of smoke tubes 8 extend vertically upward.
  • the smoke tubes are distributed along a pitch circle concentric with the shell of furnace chamber l, and at their upper ends they open into one or more plenum chambers 9, from which another plurality of smoke tubes l0 extend downwardly along a circle concentric with the pitch circle of smoke tubes 8.
  • Each smoke tube l0 opens into a lower plenum chamber ll concentric with plenum chamber 7 and separated therefrom by a vertical partition wall. As illustrated in Fig.
  • the heat exchanger comprises two further, circular rows of smoke tubes l2 and l3, respec­tively, which conduct the combustion gases from each plenum chamber ll via an upper plenum chamber l4 con­centric with chamber 9 to a lower plenum chamber l5 from which the combustion gases are discharged through an outlet (not shown).
  • a plurality of series-connected air flow passages l6, l7, l8, and l9, each of which surrounds a respective group of smoke tubes, is defined between a succession of vertical walls 20, 2l, 22, 23, and 24, all coaxial with the shell 2 of furnace chamber l.
  • the air passages are interconnected through alternate upper and lower plenum or turning chambers 25, 26, and 27. Air to be heated flows through an inlet (not shown) to a distributor chamber 28 into which the lower ends of air passages l6 open, and the heated air is discharged from the heat exchanger through a collector chamber 29 into which the lower ends of air passages l9 open.
  • Fig. 2 is a vertical section through one of the smoke tubes l2 which at its ends is sealingly secured in the top wall 30 of plenum chamber ll and the bottom wall 3l of plenum chamber l4, respectively.
  • heat from the upwardly flowing combustion gases is to be transferred to the air flowing downwardly through the surrounding air passage l7.
  • a chain generally designated by 32, is suspended centrally within each of the total number of smoke tubes in the heat exchanger.
  • Each chain 32 extends throughout the height of the associated tube from a supporting pin 33 welded to the tube adjacent its upper end down to a level below the top wall 30 of the lower plenum chamber ll.
  • chain 32 is composed of successive groups of relatively larger and smaller chain links designated by 34 and 35, respectively.
  • transverse dimen­sion or width of chain links 34 may be approximately one third of the inner tube diameter, and the width of links 35 may be correspondingly smaller, as shown. It is pre­ferred that the portion of chain 32, which protrudes below wall 30 into chamber ll, is composed of the smaller links 35.
  • a deflector or twister element 36 which is shown on a considerably larger scale in Figs. 3 and 4.
  • Deflector element 36 is U-shaped with a horizon­tal upper limb 37 and two parallel vertical limbs 38 and 39 of which limb 38 is substantially longer than limb 39.
  • a crossbar 40 is welded to the vertical limbs 38 and 39 on one side of the deflector element so as to create an "unbalanced" mass distribution of the element in the sense that its centre of mass will be offset, both in the general plane of the element and at right angles thereto, relative to the longitudinal axis of chain 32 when deflector element 36 is welded thereto at the center of its upper limb 37, as shown in Fig. 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP86307355A 1985-10-07 1986-09-25 Apparatus for preventing the formation of deposits on vertical heat exchanger walls Withdrawn EP0219986A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK4563/85 1985-10-07
DK456385A DK456385A (da) 1985-10-07 1985-10-07 Udstyr til at forebygge aflejringer paa vertikale varmevekslervaegge

Publications (1)

Publication Number Publication Date
EP0219986A1 true EP0219986A1 (en) 1987-04-29

Family

ID=8134691

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86307355A Withdrawn EP0219986A1 (en) 1985-10-07 1986-09-25 Apparatus for preventing the formation of deposits on vertical heat exchanger walls

Country Status (2)

Country Link
EP (1) EP0219986A1 (da)
DK (1) DK456385A (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113819483A (zh) * 2021-09-18 2021-12-21 华能曲阜热电有限公司 一种减缓积灰耐腐蚀的空预器

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE457572C (de) * 1928-03-20 Paul Cimbolek Selbsttaetiger Rohrreiniger fuer Kondensatorrohre
FR1027888A (fr) * 1949-11-24 1953-05-18 Rekuperator K G Dispositif permettant d'augmenter la transmission de chaleur dans les échangeurs de température, ainsi que les échangeurs munis de ce dispositif
DE1003905B (de) * 1953-08-25 1957-03-07 Rudolf Hingst Dipl Ing Vorrichtung zur rauchgasseitigen Reinigung der Rohre von Waermeaustauschern mittels Ketten
CH505360A (de) * 1969-03-27 1971-03-31 Ygnis Sa Turbulenzerhöhender Einsatz für Wärmeaustauscher und dessen Verwendung in Rauchgaskanälen
GB2124322A (en) * 1982-07-20 1984-02-15 Holden William J Heat exchanger cleaner
DE3327321A1 (de) * 1983-07-29 1985-02-07 Motoren-Werke Mannheim AG vorm. Benz Abt. stationärer Motorenbau, 6800 Mannheim Vorrichtung zum reinigen des mindestens einen rohres von waermeuebertragern

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE457572C (de) * 1928-03-20 Paul Cimbolek Selbsttaetiger Rohrreiniger fuer Kondensatorrohre
FR1027888A (fr) * 1949-11-24 1953-05-18 Rekuperator K G Dispositif permettant d'augmenter la transmission de chaleur dans les échangeurs de température, ainsi que les échangeurs munis de ce dispositif
DE1003905B (de) * 1953-08-25 1957-03-07 Rudolf Hingst Dipl Ing Vorrichtung zur rauchgasseitigen Reinigung der Rohre von Waermeaustauschern mittels Ketten
CH505360A (de) * 1969-03-27 1971-03-31 Ygnis Sa Turbulenzerhöhender Einsatz für Wärmeaustauscher und dessen Verwendung in Rauchgaskanälen
GB2124322A (en) * 1982-07-20 1984-02-15 Holden William J Heat exchanger cleaner
DE3327321A1 (de) * 1983-07-29 1985-02-07 Motoren-Werke Mannheim AG vorm. Benz Abt. stationärer Motorenbau, 6800 Mannheim Vorrichtung zum reinigen des mindestens einen rohres von waermeuebertragern

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113819483A (zh) * 2021-09-18 2021-12-21 华能曲阜热电有限公司 一种减缓积灰耐腐蚀的空预器

Also Published As

Publication number Publication date
DK456385D0 (da) 1985-10-07
DK456385A (da) 1987-04-08

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Inventor name: KOLLERUP, VAGN

Inventor name: JADOUIN, MICHEL ALBERT