EP1291598A1 - Apparatus for cleaning the open draft boiler surfaces in a combustion or incineration plant - Google Patents
Apparatus for cleaning the open draft boiler surfaces in a combustion or incineration plant Download PDFInfo
- Publication number
- EP1291598A1 EP1291598A1 EP01121249A EP01121249A EP1291598A1 EP 1291598 A1 EP1291598 A1 EP 1291598A1 EP 01121249 A EP01121249 A EP 01121249A EP 01121249 A EP01121249 A EP 01121249A EP 1291598 A1 EP1291598 A1 EP 1291598A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle head
- accordance
- cleaning fluid
- cleaning
- nozzles
- 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.)
- Granted
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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
- F28G3/16—Rotary appliances using jets of fluid for removing debris
- F28G3/166—Rotary appliances using jets of fluid for removing debris from external surfaces of heat exchange conduits
Definitions
- the present invention relates to an apparatus for cleaning the open draft boiler surfaces in a combustion or incineration plant of the kind set forth in the introductory portion of claim 1.
- the nozzle head on the end of the flexible hose can simply be lowered through the opening provided in the top of the open draft to be cleaned and moved downward while supplying cleaning fluid to the nozzles for delivery to the surfaces to be cleaned in an efficient way.
- the construction can be relatively simple as the cleaning fluid will keep the construction cool during the cleaning operation and the construction, thus, will not have to suffer the high temperatures inside the open draft of the combustion or incineration plant in service. Furthermore, the flexible hose construction reduces the amount of space required for introducing the cleaning apparatus into the open draft, thereby enabling the use of the apparatus in connection with existing plants substantially without any modifications thereof.
- the combustion or incineration plant shown in fig. 1 comprises three successive open drafts 17, 18, 19 in which heat is transferred from the flue gasses to boiler tubes covering the walls of the open drafts 17, 18, 19. After the open drafts 17, 18, 19 a superheater 20 or several such superheaters and other boiler constructions are positioned.
- the cleaning apparatus implemented in the combustion or incineration plant shown in fig. 1 comprises a cleaning head 1 mounted on the end of a flexible hose 7 for insertion and lowing inside the open draft 17 through an opening 16 centrally positioned in the top of the open draft 17.
- the linear movement of the cleaning head 1 inside the open draft 17 is provided by rotating the hose reel 6 upon which the hose 7 is mounted.
- the rotation of the nozzle head 4 is provided by means of a turbine 2 driven by the cleaning fluid entering the cleaning head 1 from the flexible hose 7.
- a gear train 3 is provided between the turbine 2 and the nozzle head 4.
- Several nozzles 5 are mounted on the nozzle head 4 in order to distribute the cleaning fluid in different directions during rotation of the nozzle head 4.
- the hose reel 6 is mounted for rotation on an axle driven by a drive unit 8 for the hose reel 6, said drive unit 8 comprising an electric motor 9 and a reduction gear mechanism 10.
- the electric motor 9 is controlled from a control unit 15 controlling the motor speed and rotational direction of the motor 9.
- the cleaning fluid is supplied to the hose 7 by means of a pump unit 11 comprising an electric motor 12 driving a pump 13.
- the electric motor 12 is controlled by the control unit 15 in order to be able to control the pressure of the cleaning fluid delivered to the flexible hose 7.
- the connection between the pump 13 and the hose reel 6 comprises a rotational coupling 14 in order to allow the hose reel 6 to rotate relative to the fixedly positioned pump 13.
- each of the open drafts 17, 18, 19 have a centrally positioned opening 16 for insertion of the cleaning head 1 and the flexible hose 7 and for lowering and raising the cleaning head 1 downward and upward through the open drafts 17, 18, 19.
- cleaning fluid is supplied through the flexible hose 7 whereby the nozzle head 4 is rotated and cleaning fluid is supplied to the internal surfaces of the open drafts 17, 18, 19 through the nozzles 5.
- These nozzles 5 are dimensioned to supply a concentrated jet of cleaning fluid to the internal surfaces of the open drafts 17, 18, 19, substantially without any dissolving into droplets of the concentrated jets.
- the cleaning fluid is water which, when hitting the inner surfaces in the open drafts 17, 18, 19, evaporates whereby the water expands to a volume of approximately 1,500 times its original volume, said expansion providing the forces necessary for removing dirt from the surfaces hit.
- the cleaning is performed in service, i.e. the combustion or incineration plant is burning off fuel and producing heat and the surfaces to be cleaned are at a high temperature, necessary for providing the evaporation of the cleaning fluid.
- the cleaning can be performed whenever this is considered necessary, e.g. as detected by rising temperature of the flue gasses entering the superheater 20, because of dirt on the boiler surfaces reducing the heat transfer from the flue gasses in the open drafts 17, 18, 19.
- a desired maximum temperature e.g. 600 - 650 °C.
- the cleaning fluid used was water and supplied to the flexible hose 7 at a pressure of approximately 4 - 5 bar on the top of the open drafts 17, 18, 19 and the nozzle head was provided with 6 nozzles.
- the time involved in cleaning a single open draft 17 was approximately 5 - 10 minutes and approximately 1,000 I of water were used for the cleaning.
- a single cleaning system may service several open drafts 17, 18, 19 by providing suitable means for introducing the cleaning head 1 and the flexible hose 7 through the corresponding openings 16.
Abstract
Description
- The present invention relates to an apparatus for cleaning the open draft boiler surfaces in a combustion or incineration plant of the kind set forth in the introductory portion of
claim 1. - In apparatuses for cleaning boiler surfaces in a combustion or incineration plant of this kind, it is known to use a nozzle head with several nozzles for supplying a cleaning fluid to the boiler surfaces to be cleaned, said nozzle head being rotated and moved linearly in a direction in and out of the combustion chamber. An apparatus of this kind is known from US 5,579,726, which describes such a device for cleaning a boiler in service, said device comprising a lance and a rotating cleaning head mounted on the end of the lance and means for providing a linear movement in and out of the combustion chamber and means for rotating the cleaning head. The lance in this device is a stiff construction and the rotational and linear movements are provided by means of motors mounted externally of the combustion chamber to be cleaned. In all constructions shown and described in said document, the linear movement is in a horizontal direction, thus requiring that the lance is of a stiff construction.
- It is the object of the present invention to provide an apparatus for cleaning the open draft boiler surfaces in a combustion or incineration plant of the kind referred to above, which is of a simplified but yet effective construction compared to the prior art apparatuses, and this object is achieved with an apparatus of said kind which, according to the present invention, also comprises the features set forth in the characterizing clause of
claim 1. With this arrangement the nozzle head on the end of the flexible hose can simply be lowered through the opening provided in the top of the open draft to be cleaned and moved downward while supplying cleaning fluid to the nozzles for delivery to the surfaces to be cleaned in an efficient way. Since the apparatus is positioned inside the open draft only during cleaning operations, the construction can be relatively simple as the cleaning fluid will keep the construction cool during the cleaning operation and the construction, thus, will not have to suffer the high temperatures inside the open draft of the combustion or incineration plant in service. Furthermore, the flexible hose construction reduces the amount of space required for introducing the cleaning apparatus into the open draft, thereby enabling the use of the apparatus in connection with existing plants substantially without any modifications thereof. - Preferred embodiments of the cleaning apparatus in accordance with the present invention, the advantages of which will be disclosed in the following detailed part of the present description, are revealed in the subordinate claims.
- In the following detailed part of the present description, the invention will be explained more in detail with reference to the exemplary embodiment of an apparatus for cleaning the open draft boiler surfaces in a combustion or incineration plant according to the invention shown in the drawings, in which:
- Fig. 1 schematically shows a combustion plant, in which the present invention is implemented,
- fig. 2 schematically shows a cleaning head in cross-section, and
- fig. 3 schematically shows a hose reel with a drive unit for controlled lowering and raising of the cleaning head and a pump unit for delivering the cleaning fluid to the flexible hose.
-
- The combustion or incineration plant shown in fig. 1 comprises three successive
open drafts open drafts open drafts superheater 20 or several such superheaters and other boiler constructions are positioned. - In such a plant it is desired to keep clean the heat exchange surfaces in the
open drafts - The cleaning apparatus implemented in the combustion or incineration plant shown in fig. 1 comprises a
cleaning head 1 mounted on the end of aflexible hose 7 for insertion and lowing inside theopen draft 17 through an opening 16 centrally positioned in the top of theopen draft 17. The linear movement of thecleaning head 1 inside theopen draft 17 is provided by rotating the hose reel 6 upon which thehose 7 is mounted. - The rotation of the nozzle head 4, as shown in fig. 2, is provided by means of a
turbine 2 driven by the cleaning fluid entering thecleaning head 1 from theflexible hose 7. In order to reduce the speed of the rotation of the nozzle head 4, agear train 3 is provided between theturbine 2 and the nozzle head 4.Several nozzles 5 are mounted on the nozzle head 4 in order to distribute the cleaning fluid in different directions during rotation of the nozzle head 4. - As shown in fig. 3, the hose reel 6 is mounted for rotation on an axle driven by a drive unit 8 for the hose reel 6, said drive unit 8 comprising an
electric motor 9 and a reduction gear mechanism 10. As likewise shown in fig. 3, theelectric motor 9 is controlled from acontrol unit 15 controlling the motor speed and rotational direction of themotor 9. - As also shown in fig. 3, the cleaning fluid is supplied to the
hose 7 by means of apump unit 11 comprising anelectric motor 12 driving apump 13. Theelectric motor 12 is controlled by thecontrol unit 15 in order to be able to control the pressure of the cleaning fluid delivered to theflexible hose 7. The connection between thepump 13 and the hose reel 6 comprises arotational coupling 14 in order to allow the hose reel 6 to rotate relative to the fixedly positionedpump 13. - As can be seen in fig. 1, each of the
open drafts opening 16 for insertion of thecleaning head 1 and theflexible hose 7 and for lowering and raising thecleaning head 1 downward and upward through theopen drafts cleaning head 1, cleaning fluid is supplied through theflexible hose 7 whereby the nozzle head 4 is rotated and cleaning fluid is supplied to the internal surfaces of theopen drafts nozzles 5. Thesenozzles 5 are dimensioned to supply a concentrated jet of cleaning fluid to the internal surfaces of theopen drafts open drafts - Due to the fact that cleaning is performed during function of the plant, the cleaning can be performed whenever this is considered necessary, e.g. as detected by rising temperature of the flue gasses entering the
superheater 20, because of dirt on the boiler surfaces reducing the heat transfer from the flue gasses in theopen drafts superheater 20 below a desired maximum temperature of e.g. 600 - 650 °C. - In this way corrosion on the superheater tubes is reduced and, furthermore, a reduction in temperature of the flue gasses in the
superheater 20 results in less sticky deposits on the superheater surfaces. In a typical incineration plant the cleaning of eachopen draft open drafts superheater 20 by approximately 100 °C. - In a test setup, the cleaning fluid used was water and supplied to the
flexible hose 7 at a pressure of approximately 4 - 5 bar on the top of theopen drafts open draft 17 was approximately 5 - 10 minutes and approximately 1,000 I of water were used for the cleaning. - Due to the fact that the cleaning system is only to be used approximately once a week, a single cleaning system may service several
open drafts cleaning head 1 and theflexible hose 7 through thecorresponding openings 16. - Although the invention has been described above in connection with a preferred embodiment of the invention, as shown in the figures, it will be evident for a person skilled in the art that several deviations may be envisaged within the scope of the following claims, such deviations comprising among others the provision of
several openings 16 for each of theopen drafts cleaning head 1 moved up and down closer to the surfaces, saidopenings 16 being positioned at a distance from the central part of eachopen draft openings 16, the provision of several cleaning systems, e.g. one cleaning system for eachopen draft respective cleaning head 1,flexible hose 7 and hose reel 6, etc.
Claims (11)
- Apparatus for cleaning the open draft boiler (17, 18, 19) surfaces in a combustion or incineration plant in service, said apparatus comprisinga nozzle head (4) with several nozzles (5),means for rotating the nozzle head (4),means for providing a mainly linear movement of the nozzle head (4) inside the open draft (17, 18, 19), andmeans for supplying a cleaning fluid to the rotating and linearly moving nozzle head (4), whereby the cleaning fluid exiting the nozzles (5) hits the surfaces to be cleaned,
the nozzle head (4) being mounted on the end of a flexible hose (7), delivering the cleaning fluid to the nozzles (5), at least one opening (16) being provided in the top of each open draft (17, 18, 19) to be cleaned, said opening (16) allowing the insertion, lowering and raising of the nozzle head (4) inside the open draft (17, 18, 19). - Apparatus in accordance with claim 1, characterized by the cleaning fluid being water
- Apparatus in accordance with claim 1 or 2, characterized by the means for rotating the nozzle head (4) being provided as a drive unit (2, 3) mounted on the end of the flexible hose (7), said drive unit (2, 3) being driven by the cleaning fluid delivered to the nozzles (5) through the flexible hose (7).
- Apparatus in accordance with claim any of the preceding claims, characterized by the means for providing a mainly linear movement of the nozzle head (4) inside the open draft (17, 18, 19) comprising a hose reel (6) with a drive unit (8) for lowering and raising the nozzle head (4) on the end of the flexible hose (7) downward and upward inside the open draft (17, 18, 19).
- Apparatus in accordance with claim 4, characterized by the drive unit (8) for the hose reel (6) being a speed controlled (15) gear motor (9, 10).
- Apparatus in accordance with any of the preceding claims, characterized by the means for supplying the cleaning fluid to the nozzle head (4) comprising a feed water pump (11) delivering the cleaning fluid at a pre-determined pressure level through the flexible hose (7).
- Apparatus in accordance with claim 6, characterized by the feed water pump (11) being pressure controlled (15).
- Apparatus in accordance with any of the preceding claims, characterized by the pressure level of the cleaning fluid delivered to the nozzles (5) being less than 10 bar.
- Apparatus in accordance with any of the preceding claims, characterized by the nozzles (5) of the nozzle head (4) being of a type which keeps the outflowing jet from the nozzles concentrated with only minor dissolving into droplets.
- Apparatus in accordance with any of the preceding claims, characterized by the rotational speed of the rotating nozzle head (4) being between 1 and 50, preferably between 5 and 10, revolutions per minute.
- Apparatus in accordance with any of the preceding claims, characterized by the flexible hose (7) being a flexible bellows-type metal hose (7), preferably of stainless steel material.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01121249A EP1291598B1 (en) | 2001-09-05 | 2001-09-05 | Apparatus for cleaning the open draft boiler surfaces in a combustion or incineration plant |
DK01121249T DK1291598T3 (en) | 2001-09-05 | 2001-09-05 | Apparatus for cleaning boiler surfaces in an incinerator |
AT01121249T ATE318400T1 (en) | 2001-09-05 | 2001-09-05 | DEVICE FOR CLEANING BOILER SURFACES OF A COMBUSTION PLANT |
DE20122403U DE20122403U1 (en) | 2001-09-05 | 2001-09-05 | Apparatus for cleaning open draft boiler surfaces in combustion or incineration plant in service, has nozzle head mounted on end of hose, and openings in top of each draft to be cleaned permitting insertion, raising and lowering of hose |
DE60117328T DE60117328T2 (en) | 2001-09-05 | 2001-09-05 | Device for cleaning boiler surfaces of an incinerator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01121249A EP1291598B1 (en) | 2001-09-05 | 2001-09-05 | Apparatus for cleaning the open draft boiler surfaces in a combustion or incineration plant |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1291598A1 true EP1291598A1 (en) | 2003-03-12 |
EP1291598B1 EP1291598B1 (en) | 2006-02-22 |
Family
ID=8178554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01121249A Expired - Lifetime EP1291598B1 (en) | 2001-09-05 | 2001-09-05 | Apparatus for cleaning the open draft boiler surfaces in a combustion or incineration plant |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1291598B1 (en) |
AT (1) | ATE318400T1 (en) |
DE (1) | DE60117328T2 (en) |
DK (1) | DK1291598T3 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005024333A1 (en) * | 2003-09-02 | 2005-03-17 | Bruendermann Georg | Cleaning of a furnace |
JP2014500943A (en) * | 2010-11-17 | 2014-01-16 | クライデ ベルゲマン ゲーエムベーハー マシーネン ウント アパラテバウ | Cleaning device for combustion boiler |
WO2021063465A1 (en) | 2019-10-04 | 2021-04-08 | Degn Design Aps | Method and apparatus for cleaning boiler surfaces in an incineration plant |
EP4184057A1 (en) | 2021-11-23 | 2023-05-24 | Gentals nv | Method and system for cleaning boilers, specifically lignite boilers |
WO2023105070A1 (en) * | 2021-12-10 | 2023-06-15 | Derc Waterjetting B.V. | Combustion oven heat exchanger cleaner |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2735794A (en) * | 1956-02-21 | fletcher | ||
DE1262496B (en) * | 1960-09-07 | 1968-03-07 | Ind Companie Kleinewefers Kons | Blowing device for removing the soot from the inside of standing recuperators |
US3541999A (en) * | 1968-09-11 | 1970-11-24 | Foster Wheeler Corp | Apparatus and process for slag deposit removal |
US5579726A (en) * | 1994-08-04 | 1996-12-03 | Finucane; Louis | Apparatus for cleaning boilers |
EP0921268A2 (en) * | 1997-12-08 | 1999-06-09 | Sofitech N.V. | Apparatus for cleaning well tubular members |
-
2001
- 2001-09-05 AT AT01121249T patent/ATE318400T1/en not_active IP Right Cessation
- 2001-09-05 DK DK01121249T patent/DK1291598T3/en active
- 2001-09-05 EP EP01121249A patent/EP1291598B1/en not_active Expired - Lifetime
- 2001-09-05 DE DE60117328T patent/DE60117328T2/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2735794A (en) * | 1956-02-21 | fletcher | ||
DE1262496B (en) * | 1960-09-07 | 1968-03-07 | Ind Companie Kleinewefers Kons | Blowing device for removing the soot from the inside of standing recuperators |
US3541999A (en) * | 1968-09-11 | 1970-11-24 | Foster Wheeler Corp | Apparatus and process for slag deposit removal |
US5579726A (en) * | 1994-08-04 | 1996-12-03 | Finucane; Louis | Apparatus for cleaning boilers |
EP0921268A2 (en) * | 1997-12-08 | 1999-06-09 | Sofitech N.V. | Apparatus for cleaning well tubular members |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005024333A1 (en) * | 2003-09-02 | 2005-03-17 | Bruendermann Georg | Cleaning of a furnace |
DE10340790B3 (en) * | 2003-09-02 | 2005-04-28 | Georg Bruendermann | boiler cleaning |
JP2014500943A (en) * | 2010-11-17 | 2014-01-16 | クライデ ベルゲマン ゲーエムベーハー マシーネン ウント アパラテバウ | Cleaning device for combustion boiler |
US9651322B2 (en) | 2010-11-17 | 2017-05-16 | Clyde Bergermann GmbH Maschinen-Und Apparatebau | Cleaning device for a combustion boiler |
WO2021063465A1 (en) | 2019-10-04 | 2021-04-08 | Degn Design Aps | Method and apparatus for cleaning boiler surfaces in an incineration plant |
EP4184057A1 (en) | 2021-11-23 | 2023-05-24 | Gentals nv | Method and system for cleaning boilers, specifically lignite boilers |
BE1029946B1 (en) * | 2021-11-23 | 2023-06-19 | Gentals Nv | Method and system for cleaning boilers, in particular lignite boilers |
WO2023105070A1 (en) * | 2021-12-10 | 2023-06-15 | Derc Waterjetting B.V. | Combustion oven heat exchanger cleaner |
NL2030105B1 (en) * | 2021-12-10 | 2023-06-27 | Derc Waterjetting B V | Combustion oven heat exchanger cleaner |
Also Published As
Publication number | Publication date |
---|---|
EP1291598B1 (en) | 2006-02-22 |
DK1291598T3 (en) | 2006-06-26 |
DE60117328D1 (en) | 2006-04-27 |
DE60117328T2 (en) | 2006-11-30 |
ATE318400T1 (en) | 2006-03-15 |
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