EP0168463A1 - Dispositif de recuperation thermique a partir de gaz de fumee - Google Patents

Dispositif de recuperation thermique a partir de gaz de fumee

Info

Publication number
EP0168463A1
EP0168463A1 EP85900788A EP85900788A EP0168463A1 EP 0168463 A1 EP0168463 A1 EP 0168463A1 EP 85900788 A EP85900788 A EP 85900788A EP 85900788 A EP85900788 A EP 85900788A EP 0168463 A1 EP0168463 A1 EP 0168463A1
Authority
EP
European Patent Office
Prior art keywords
section
flue
heat
collecting groove
cross
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Withdrawn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
EP85900788A
Other languages
German (de)
English (en)
Inventor
Kjell Edbom
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.)
Celleco AB
Original Assignee
Celleco AB
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 Celleco AB filed Critical Celleco AB
Publication of EP0168463A1 publication Critical patent/EP0168463A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F28D21/0005—Recuperative heat exchangers the heat being recuperated from exhaust gases for domestic or space-heating systems
    • F28D21/0007—Water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
    • F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
    • F23J3/023—Cleaning furnace tubes; Cleaning flues or chimneys cleaning the fireside of watertubes in boilers
    • 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
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents

Definitions

  • the present invention relates to a device in combustion plants for heat recovering from flue gases, flowing through an essentially vertical flue, by heat exchange with a heat absorbing fluid, which is brought to flow within heat exchanger elements provided in the flue.
  • Flue gases from combustion plants generally contains dust particles, which have a tendency to deposit on heat exchanger elements installed for heat recovering from the flue gases, even if special dust separators are installed, such as electric filters.
  • the possibility of periodical cleaning of the heat exchanger elements therefore, must generally be provided to maintain a high efficiency of the heat recovering device.
  • One way of solving the cleaning problem is to design the heat exchanger section such that the heat exchanger elements can be reached easily from outside and be cleaned by means of suitable means.
  • Another common way is to install pressurized air or liquid rinsing means in the heat exchanger device for automatic cleaning after a certain period of operation.
  • the object of the present invention is to provide a heat exchanger arrangement in a vertical flue with equipment for intermittent rinsing of heat exchanger elements installed in the flue, and a simple and reliable collecting means for the rinsing liquid.
  • a device comprising a number of heat exchanger elements and means for external liquid rinsing of the heat exchanger elements provided in a heat exchanging zone of a vertical flue, to which also a by-pass channel is connected with an inlet below the heat exchanging zone and an outlet above the heat exchanging zone, said by-pass channel being connectable via necessary damper members to intermittently conduct the flue gases away from the heat exchanging zone, the device being characterized mainly by a collecting means for said washing liquid comprising a collecting groove arranged below the heat exchanging zone along the inside periphery of the flue, said collecting groove communicating with an outlet for the washing liquid, and by a flap element, which is turnable around a pivot situated peripherally in the flue in order to be turned after a period of cleaning into substantially a vertical position, so that substantially the entire flue cross-section defined by the collecning groove is uncovered, and to be turned before a period of cleaning into a position such that it entirely covers said cross-section and conduct
  • simplicity as to design of the collecting means, and a completely undisturbed gas inlet to the heat exchanging zone are achieved by forming the collecting groove on the outside of a lower channel section, which is surrounded by an upper channel section, the walls of which are connected to said lower channel section below the edge of its end portion.
  • a rectangular cross-section offers a maximum utilization of the available cross-section for free gas flowing into the heat exchanging zone, and a minimum need of space for the flap element in a vertical position along a straight wall in the heat exchanging zone.
  • a rectangular cross-section may be advantageously utilized with respect to the choice of heat exchanger elements suited for the purpose.
  • the heat exchanger elements are constituted by a number of similar flat laminas, formed by joined rectangular plate elements, said laminas being arranged in parallel side by side with vertically oriented heat transferring surfaces across a rectangular channel cross-section. Further, since these rectangular laminas are fixed only along their vertical edges to two opposite walls of the channel section, straight and open gas flow channels may be obtained between the laminas along relatively even and smooth heat transferring surfaces over almost the entire channel cross-section.
  • the flap element As mentioned above, no sealing function between the flap element and the inlet of the heat exchanging zone is required according to the invention; only that the flap element when it is turned in its lower position covers the gas inlet and conducts falling liquid away to the collecting groove surrounding the gas inlet.
  • the flap element according to a preferred embodiment of the invention is arranged to abut against the edge of the gas inlet section, when it is turned in its lower position, the flap element furter being fitted with edge elements, which in said position extends below and surrounds the upwardly projecting edge of the gas inlet.
  • Fig. 1 shows a vertical section through a flue with a heat recovering device according to the invention
  • Fig. 2 shows a sectional, partial view of the liquid collecting device shown in Fig. 1
  • Fig. 3 shows a horizontal section through the heat exchanging zone of the flue
  • Fig. 4 shows a horizontal section of the flue between the heat exchanging zone and the liquid collecting groove.
  • Fig. 1 shows a portion of a vertical flue provided with a heat recovering device according to the invention.
  • a lower flue section of rectangular cross-section forms a gas inlet to a heat exchanging zone 2 also of rectangular cross-section, which is larger than the cross-section of the inlet section 1.
  • a by-pass channel 3 is provided with an inlet below the heat exchanging zone 2 and an outlet above the same and is equipped with a damper member 4 having a control means 5 for opening and closing of the channel.
  • the walls of the heat exchanging zone 2 are attached to the walls of the inlet section 1 below the end edge of the inlet section such that a liquid collecting groove 6 is formed on the outside of the inlet section 1 and around the same.
  • a rectangular flap 7 is fixed to a shaft 8 journalled in bearing members 9, 10, which are fixed to two opposite walls of the heat exchanging zone 2, so that it extends through the groove 6 outside the inlet section 1.
  • the flap 7 is turnable from the shown position, in which it abuts the end edge of the inlet section 1, into substantially a vertical position 7', in which the inlet section is completely uncovered for gas flow into the heat exchanging zone 2.
  • the flap further is provided with edge elements 12, which surround the inlet section 1 when the flap is turned down to its closing position. Since two opposite edges of the inlet section 1, as well as two corresponding wall connections between the heat exchanging zone 2 and the inlet section 1, are somewhat inclined with respect to a horizontal plane, the groove 6 surrounding the inlet section 1 is correspondingly inclined and has a lowest portion along one side wall of the heat exchanging zone, through which sidewall there is provided an outlet 13 for washing liquid.
  • the heat exchanging zone 2 there is a number of similar flat laminas 14, formed by joined rectangular plate elements , said laminas 14 being arranged in parallel side by side, with vertically oriented heat transferring surfaces, across the rectangular cross-section of the heat exchanging zone, such that open vertical gas flow channels 15 are formed between two successive laminas 14. Since spacing members 16 are provided only along two opposite walls of the heat exchanging zone 2 to fix the laminas 14 along their two vertical side edges, almost the entire wall surface defining each gas flow channel 15 will be formed by two relatively smooth rectangular heat transferring surfaces of two successive laminas.
  • the rectangular cross-section of the heat exchanging zone which is advantageous with respect to the liquid collecting device, can be advantageously utilized also with respect to the heat exchanger unit itself, which unit may be made compact with the described rectangular laminas, and yet offer gas flow channels with a minimum tendency of dust deposition, said gas flow channels also being easily accessible for rinsing by means of washing liquid from liquid distributors provided above the laminas.
  • the heat exchanger elements or the laminas 14 at the upper end of their two vertical side edges are fixed to a carrying beam member 17 extending along two opposite sides of the rectangular heat exchanging zone 2.
  • the other spacing members 16 provided further down along the end edges of the laminas are preferably not firmly connected to the laminas but are provided with recesses 18 in which the ends of the laminas are movably fixed.
  • inlet and outlet boxes 19 and 20 with inlet and outlet ports 21 and 22 are provided at the respective upper and lower ends of the laminas 14, the boxes preferably being connected with the laminas such that the upper and lower portions of the side edges of the laminas open into the inlet box 19 and the outlet box 20, respectively.
  • a distribution member 23 for the distribution of washing liquid from an inlet 24 to spray nozzles 25 distributed over the cross-section of the heat exchanging zone 2.
  • pressurized air nozzles may be installed above, between or below the laminas 14.
  • an initial air blowing of the heat exchanger elements may facilitate or improve a subsequent cleaning by liquid rinsing.
  • the cleaning of the laminas can be completely performed by means of compressed air.
  • the collecting device according to the invention is well adapted for liquid rinsing, subsequent to the compressed air treatment, to flush away dust having already been removed from the heat exchanger surfaces.
  • the flap 7 As mentioned above, for the function of the device according to the invention, there is required no real sealing between the flap 7 and the inlet section 1. Considering a situation when the main flue is blocked before a period of cleaning, for example by means of a butterfly valve between the inlet of the by-pass flow channel 13 and the flap element 7, it is nevertheless realized that the flap element 7 must be arranged such that a gas pressure possibly remaining below the flap can not lift the flap. Therefore, during the period of cleaning there should be applied a moment in the closing direction on the flap 7 through the shaft 8 and. the control device 11. If a sufficient moment in the closing direction is applied on the flap 7, the latter may possibly also serve as a closing member for the gas flow in the main flue, so that the need of further damper members therein is eliminated.
  • the flap 7 or the end edge of the inlet section 1 may also be provided with sealing elements of a material resistant to the temperature of the flue gas, as for example Teflon.

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)
  • Devices For Use In Laboratory Experiments (AREA)
  • Chimneys And Flues (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

Dans un dispositif de récupération thermique à partir de gaz de fumée s'écoulant à travers une conduite de fumée essentiellement verticale, un certain nombre d'éléments d'échange thermique (14) sont suspendus verticalement dans la conduite, où sont également prévus des mécanismes de rinçage liquide (23, 25) au-dessus des éléments d'échange thermique (14) pour rincer ces derniers de manière intermittente. Afin de recueillir le liquide de lavage tombant de manière intermittente, un dispositif collecteur est prévu en dessous des éléments d'échange thermique (14), comportant une gorge collectrice s'étendant le long de la circonférence intérieure de la conduite de fumée, et un élément de volet (7), pouvant tourner autour d'un pivot (8) situé périphériquement dans la conduite afin d'être tourné en une position essentiellement verticale (7') après une période de nettoyage, si bien que pratiquement toute la section transversale de la conduite déterminée par la gorge collectrice (6) est découverte et d'être tourné avant une période de nettoyage dans une position telle qu'il recouvre entièrement ladite section transversale et conduit le liquide de lavage tombant dans ladite section transversale pour l'évacuer vers ladite gorge collectrice.
EP85900788A 1984-01-20 1985-01-11 Dispositif de recuperation thermique a partir de gaz de fumee Withdrawn EP0168463A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8400275A SE8400275L (sv) 1984-01-20 1984-01-20 Anordning for vermeatervinning ur rokgaser
SE8400275 1984-08-13

Publications (1)

Publication Number Publication Date
EP0168463A1 true EP0168463A1 (fr) 1986-01-22

Family

ID=20354377

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85900788A Withdrawn EP0168463A1 (fr) 1984-01-20 1985-01-11 Dispositif de recuperation thermique a partir de gaz de fumee

Country Status (5)

Country Link
EP (1) EP0168463A1 (fr)
FI (1) FI853603L (fr)
NO (1) NO853675L (fr)
SE (1) SE8400275L (fr)
WO (1) WO1985003339A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10258066A1 (de) 2002-12-11 2004-06-24 Thyssenkrupp Encoke Gmbh Koksofengaskühler
DE102011102811A1 (de) * 2011-05-30 2012-12-06 Robert Bosch Gmbh Verfahren zur Reduzierung von Brennstoffablagerungen an einem Wärmetauscher
CN111271727B (zh) * 2020-03-03 2025-05-13 东方电气集团东方锅炉股份有限公司 防止空预器及尾部余热利用设备硫酸氢铵沉积的系统及其控制方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB430050A (en) * 1934-03-16 1935-06-12 George Edward Tansley Improvements in or connected with tubular feed water heaters and the like
GB664927A (en) * 1949-03-11 1952-01-16 Thompson John Water Tube Boilers Ltd Improvements relating to heat exchange apparatus
GB1068193A (en) * 1963-08-09 1967-05-10 Kawasaki Heavy Ind Ltd Means for washing heating surfaces of a heat-exchanger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8503339A1 *

Also Published As

Publication number Publication date
FI853603A0 (fi) 1985-09-19
SE8400275D0 (sv) 1984-01-20
SE8400275L (sv) 1985-07-21
WO1985003339A1 (fr) 1985-08-01
FI853603A7 (fi) 1985-09-19
NO853675L (no) 1985-09-19
FI853603L (fi) 1985-09-19

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT CH DE FR GB LI

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19851222

RIN1 Information on inventor provided before grant (corrected)

Inventor name: EDBOM, KJELL