EP0023937A1 - Russbläservorrichtung - Google Patents

Russbläservorrichtung Download PDF

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Publication number
EP0023937A1
EP0023937A1 EP79301627A EP79301627A EP0023937A1 EP 0023937 A1 EP0023937 A1 EP 0023937A1 EP 79301627 A EP79301627 A EP 79301627A EP 79301627 A EP79301627 A EP 79301627A EP 0023937 A1 EP0023937 A1 EP 0023937A1
Authority
EP
European Patent Office
Prior art keywords
lance
tubes
housing
apertured
banks
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
Application number
EP79301627A
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English (en)
French (fr)
Other versions
EP0023937B1 (de
Inventor
Herb Michelson
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP79301627A priority Critical patent/EP0023937B1/de
Priority to DE7979301627T priority patent/DE2967085D1/de
Publication of EP0023937A1 publication Critical patent/EP0023937A1/de
Application granted granted Critical
Publication of EP0023937B1 publication Critical patent/EP0023937B1/de
Expired 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
    • F28G15/00—Details
    • F28G15/04—Feeding and driving arrangements, e.g. power operation
    • 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

  • This invention relates to the art involving cleaning devices which are used to remove deposits of soot, dirt and debris from heat exchange tube surfaces and particularly on the surfaces of tubes used in connection with furnaces and boilers.
  • cleaning devices which are used to remove deposits of soot, dirt and debris from heat exchange tube surfaces and particularly on the surfaces of tubes used in connection with furnaces and boilers.
  • air or steam under high pressure to literally blow the deposits off the tubes and thus prevent the deposits from becoming a layer of insulation which would reduce the exchange or transfer of heat by the tubes and adversely affect their function.
  • soot blowers are usually referred to in the trade as soot blowers.
  • the heat exchange tubes are customarily provided in banks or clusters.
  • the hot combustion gases from the boiler or furnace pass over these banks of tubes which absorb the heat therefrom and thus heat the contents of each tube in the usual heat exchange function.
  • the exterior of the tubes collect dust or soot emitting from the furnace or boiler which makes the tubes less effective as heat exchange units unless thorougly cleansed from time to time.
  • a lance which extends across the width of the tube bank.
  • the lance is provided with apertures or nozzles extending thereover at pre-determined spaced distances.
  • High pressure steam is introduced into the lance and this steam emits through'the various nozzles in order to enable jets of steam to pass therethrough and blow away the soot, dust and other debris.
  • This device is usually provided with motor drive means disposed exteriorly of the furnace whereby the lance is continuously rotated through 360° continuing cycles thus attempting to blow the soot and debris away in a complete circle around the lance.
  • This type cannot accommodate a flexible hose feed for the steam supply as it would become overly twisted and block the passage.
  • soot blowers of this type must be mounted in proximity to each other along the length of the bank of tubes which is a relatively costly arrangement.
  • soot blowers have other disadvantages. Among them is the arrangement whereby the lances remain interiorly of the housing carrying the banks of tubes when not in use. Thus the lances are exposed to the condition or atmosphere of the hot corrosive flue gases at all times which causes the lance to deteriorate and necessitates eventual replacement of the lances or use of an expensive corrosion resistant alloy. Furthermore, the lances, as aforesaid, are multi-nozzled or apertured. In fact, customarily, nozzles are provided every 200 to 300 mm along the length of the lance in order to assure its effectiveness. As this system is used in furnaces of varying widths including extremely wide furnaces, many nozzles are required.
  • each jet nozzle requires a flow rate of thousands of pounds an hour to provide a high momentum needed to effectively clean the banks of tubes.
  • it is necessary to install an expensive steam generator because of the high simultaneous capacity required. Since sootblowing is carried out for a small fraction of the time that the boiler or furnace operates, the expensive steam generating capacity is idle most of the time.
  • soot blower in current commercial use is one which also constantly rotates through 360° continuous cycles but is insertable and retractable.
  • Such a soot blower is described in U.S. Patent No. 2,696,016.
  • a "lance" is also utilised but of a slightly different construction.
  • This lance has two opposed nozzles at its terminus and rotates as it is advanced into the tube. The lance continuously rotates a full 3600 in continuing cycles throughout the entire width of the tube bank.
  • a reversing mechanism is provided to retract the lance after it reaches the end of its forward travel and it is brought back to a position outside of the housing containing the tube bank.
  • the aforesaid construction has specific disadvantages.
  • a separate lance is required at predetermined spaced intervals along the length of the tube bank because the effective area which may be cleaned by the soot blower is quite limited extending only to about a 3 or 4 foot radius.
  • costly seals must also be provided in the construction between the rotating lance and its interior supply tube.
  • the soot blower of the present invention overcomes the problems described above with regard to these commercial soot blowers presently provided and presents a unit which is extremely efficient while requiring only a minimum amount of parts and little maintenance while nonetheless effectively cleaning the surfaces of the tube banks in an extremely efficient manner.
  • a soot blowing system for cleaning banks of tubes or the like disposed in an apertured housing
  • the system comprising a soot blowing system for cleaning banks of tubes or the like disposed in an apertured housing, the system being characterised in the combination of a movable carriage located externally of the housing, and an apertured lance carried by the movable carriage for sequential insertion into the apertures in the housing to pass in proximity to the banks of tubes, the lance being connectable to a fluid supply and rotatable to emit fluid under pressure through its apertured portion for cleaning the tubes in the area of the emission of the fluid.
  • a method for cleaning banks of tubes or the like disposed in an apertured housing comprising inserting an apertured soot blowing lance into an apertured housing in proximity to the banks of tubes, supplying fluid to the lance for emission over an area of the banks of tubes to clean the tubes, moving the lance forwardly on a substantially horizontal plane from the aperture toward the other side of the housing, incrementally rotating the lance in one direction when the lance is in proximity to the other side of the housing, and moving the lance rearwardly toward the aperture on a substantially horizontal plane.
  • a method for cleaning banks of tubes or the like disposed in an apertured housing comprising inserting an apertured soot blowing lance into an apertured housing in proximity to the banks of tubes, supplying fluid to the lance for emission over an area of the banks of tubes to clean the tubes, incrementally moving the lance forwardly on a substantially horizontal plane from the aperture toward the other side of the housing., and rotating the lance after each increment of forward movement of the lance.
  • the present invention comtemplates the utilisation of a step by step sequetial cleansing operation in which there is no 360 continuous rotation of the lance around the supply tube and consequently there is no need for seals.
  • the lance of the soot blower of the present invention uses only two nozzles and thus requires only a low steam generating capacity for cleansing purposes with the consequent large saving in steam generation capacity.
  • the present invention specifically provides a lance which is directly attached to a relatively elongate flexible hose.
  • the lance does not rotate or turn in any way while travelling into and through and steam cleaning an area of the aforesaid tube bank.
  • the lance is turned about between 5° to 20° and is then gradually withdrawn from the tube bank housing while continuing to emit steam for cleansing purposes during the withdrawal operation.
  • the flexible tube to which the lance is attached is also twisted between 5° to 20° in the step. At the end of the withdrawal sequence, which stops short of complete withdrawal from the housing, an area covered by an arc between 5° and 20° on the tube banks above and below the lance have been cleansed.
  • the lance is rotated or twisted an additional 5° to 20° in which position it re-enters the tube bank housing and steam continues to be emitted through the nozzles for cleansing in this additional area.
  • the lance makes an additional 5° to 20° rotation or twist and is withdrawn with steam emitting therefrom for cleansing thoroughly this additional arcuate area.
  • the lance is completely removed from the tube bank housing and the steam is shut off.
  • the carriage arrangement utilised in the present invention moves the soot blower lance to the next station. While the lance and attached hose may be returned to its original straightened position before entering the next station, it is preferable that the lance and the hose remain in the "twisted" position upon entering the next port and then be rotated in a reversed direction or untwisted in sequential increments of about 5° to 20° as aforesaid in a direction reverse to the previous direction so that the flexible tube to which it is attached retraces its previous path of twisting cycle and finishes the second cycle in a straightened condition as it was at the starting position of the previous cycle.
  • the lance enters the housing containing the tube banks but does not travel immediately to the other end of the tube bank. Instead, the lance enters the tube bank a relatively short pre-determined distance equivalent to the distance of the arc of 5° to 20° set forth above with its nozzles on a substantially horizontal plane. The travel of the lance is stopped and the lance is turned or twisted over an arc up to 180°. The apertures or nozzles have thus emitted steam over a sector of the banks above and below the lance. The lance is then moved forward another pre-determined increment also equivalent to the distance of the aforesaid arc of from.5° to 20 0 and turned or twisted in a direction reverse to the direction of the previous turn or twist above described.
  • the cleaning system of the present invention utilises sequential stepped operations of slightly different form to accomplish the highly desirable result.
  • the relatively rigid lance utilises a flexible hose attached thereto by a clamp or held by any other attaching means for the supply of steam because the approximate 180° twist required for the cycle in either version of the invention can be accommodated by the flexible hose without the requirement of any seal. This twist in no way blocks the passage in the hose.
  • the invention therefore takes advantage of the flexibility of the elongate feed hose to which the lance is attached and which can without rupturing and blocking, turn or twist through the 180° position of rotation without deleterious effects and can. thereafter be returned sequentially in either version of the invention to its original position to effectively provide a total cleansing operation.
  • the invention eliminates the necessity for multiple lances, continuous rotation, excessive steam generation, or any of the other disadvantages of previous utilised soot blowers.
  • a furnace or boiler area 10 through which hot flue or exhaust gases flow.
  • This area is within the furnace or it can be located in an area adjacent thereto for heat exchange purposes as is well-known in the art.
  • Tubes 11 are disposed within the housing 10 which comprises the furnace or flue area and are distributed in banks or clusters 12. Tubes 11 become covered with soot and other debris as a result of combustion in the furnace when .in use. This soot and debris provide, an undesirable insulating cover over the area and detract from the conventional heat exchange function of the tubes.
  • the system and apparatus of the invention provide a novel, relatively inexpensive and unique means for cleansing the tubes to remove the deposited soot and other debris and permit the tubes to perform their function.
  • a movable cleansing system 13 is disposed adjacent to the housing 10 and is shielded therefrom by wall 14 extending between the compartment 15 carrying the system and the housing 10.
  • the system 13 comprises a track 16 which carries a movable platform 17 on wheels 18 riding on track 16.
  • a lance 19 Secured to the upper part of the platform is a lance 19 which travels with the platform along the track 16 to predetermined desired positions. These stop positions are located in each instance adjacent to one of the entry ports 20, 20a, etc. in the side wall 14 of the furnace or flue housing 10.
  • the ports make accessible the clusters of tubes 11 disposed within the housing.
  • the lance 19 is inserted into the housing through the port in the direction of the arrow shown in Fig. 3.
  • the lance is substantially hollow and, as hereinafter set forth, is at predetermined times filled with steam under pressure from the flexible steam hose 21.
  • the lance 19 is directly connected to the flexible steam hose 21 by means of a clamp 22. While a clamp has been illustrated, it is to be understood that any suitable means for affixing the steam hose to the lance is within the purview of this disclosure. There is no extraneous or separate seal required between the lance 19 and the flexible hose 21 and the hose twists as the lance rotates.
  • the lance 19 is preferably provided near its terminal end with two diagonally opposed apertures 23 and 24.
  • the steam hose 21 is provided with a condensation hose ending in steam trap 25 to prevent condensation from entering the furnace which could cause damage to the walls 10.
  • the lance when the lance approximately reaches the side of the housing 10 opposite the port 20, it is automatically twisted approximately 5° to 20° in the direction of the arrow shown in Fig. 4 while steam is still constantly being emitted from the apertures 23 and 24.
  • the lance is then in position for withdrawal movement and automatically begins the return while cleansing the area of the tube bank 12 adjacent the heretofore services area described with relation to the first pass.
  • This cleansing operation effects an additional area covered by an arc between 5 0 to 20 0 during this second pass of the operation.
  • the withdrawal movement of the lance 19 is automatically terminated prior to the time when the emitting apertures 23 and 24 reach port 20.
  • the lance is again automatically stopped and rotated an additional 5° to 10° in the same direction as that of the first two passes.
  • Forward movement of the lance in the direction of the arrow shown in Fig. 3 is again resumed thereby cleaning an additional area in the tube bank covered by an arc of from 5° to 20° from each aperture 23 and 24 by steam which is continuously emitting through these apertures.
  • the lance is totally withdrawn from the port hole 20 at which time the supply of steam to the lance is automatically discontinued.
  • the platform or carriage 17 is then automatically moved along the track to the next adjacent port hole 20a where an automatic stop terminates movement of the carriage 17.
  • the lance is automatically reinserted into this next adjacent port hole 20a and the cleansing cycle is continued.
  • the operative sequence does not follow the diagramatic arrangement set forth in Fig. 5 but instead provides an oppositely turning sequence.
  • the 5° to 20° increments of turn in rotation of the lance are in a direction opposite to the direction of rotation set forth with regard to the first thrust and thus opposite to the direction of the arrows in Fig. 5.
  • the steam hose 21 attached to the lance for its steam supply is untwisted and returns to its normal straight: position.
  • the hose need never be twisted over an arc comprising more than approximately 180° while nevertheless accomplishing all of the desired cleansing operations over the entire area of the tube bank in sequential passes entering each port hole in turn.
  • the lance need not be removed from port 20 and inserted in port 20a before it is rotated to untwist the steam hose 21.
  • the lance may be automatically rotated in a direction opposite to the incremental rotation shown in Fig. 5 so that the hose is untwisted and straightened before it enters port 20a.
  • the lance can again rotate in the sequential steps shown in Fig. 5 or alternatively rotate sequentially in the opposite direction.
  • the lance may have a single aperture and be rotated over 360 0 in the 5° to 20° increments as such rotation will not twist the elongate steam hose 21 in such fashion as to prevent it from appropriately functioning.
  • the sequential steps described above would be repeated. However, the rotation of the lance would pass through 360 with the steam being emitted when necessary to clean the tube banks in the path of the lance aperture or whenever desired.
  • FIG. 6 shows the lance structure inserted into the port'hole 20 in the wall 14 of the housing 10.
  • the lance is carried by the same type platform 17 riding on tracks and has the same steam hose arrangement as the structure illustrated in Figs. 1 and 2.
  • the lance 19. is inserted into the housing 10 to a lesser extent in the first portion of the thrust than the extent of the insertion of Figs. 3-5.
  • the thrust extends from the "start" position to position 30. Thelance at this point is then rotated approximately a full 180 0 to position 31 shown in Fig.
  • increments of travel of the lance into the furnace area 10 between points 31-32, 33-34, etc. are substantially equivalent of the distance covered by the 5° to 20° incremental rotation of the lance as shown in Figs. 4 and 5. This accomplishes a total cleansing of the tube area in a highly efficient manner. It is also to be understood that steam may be emitted from the lance only at such time when tube banks 11 are in the path of the apertures 23 and 24 in order that energy be conserved.
  • Fig.' 8 is a simplified diagramatic disclosure of the electrical arrangement including the motors and switching structure utilised in connection with the invention herein described in Figs. 1-5. Three motors may be involved as follows:
  • All three motors are essentially standard Direct Current motors so that when the polarity of the current to the motor is reversed, the motor turns in the opposite direction. Also, since the motors have a gear drive, only a fraction or a horsepower each is required for the necessary functions.
  • Each motor is supplied current through a number of switches. These switches are multiple pole, double throw. They are capable of performing one or both of the following two functions, depending on the way they are wired:
  • switch A (interrupt) which is mounted anywhere convenient to the operating personnel.
  • This supplies current to the carriage travel Motor III.
  • the carriage travels until it reaches the first soot blowing station, a position where switch B (interrupt) engages a strikerplate.
  • Switch B interrupts the current Motor III and starts the current to Motor I propelling the lance into the furnace.
  • switch C (interrupt) is actuated which opens the solenoid valve admitting the blowing medium to the lance.
  • switch D (interrupt) is actuated which will start the rotation Motor II.
  • switch E reverse
  • switch F interrupt
  • the lance then is withdrawn from the furnace and properly positioned stops rapidly actuate switches D, E and F so that the lance is travelling inward again after a slight rotation. After completing an in and out cycle covering almost 180 0 the lance travels outward from the furnace. There are no stops located in the path of the outgoing lance to activate any of the switches which had previously been used to reverse and rotate the lance. As the lance is withdrawn, switch C is activated, stopping steam flow.
  • a striker plate on the lance actuates switch G thereby causing motor I, which was operating to move the lance 19 outward from the furnace area 10, to stop and starting motor III.
  • the carriage 17 is thereupon moved until it reaches the next sootblowing position where a striker plate has been positioned to reactuate switch B which stops motor III and starts motor I.
  • the lance continues its outward movement and immediately thereafter engages a striker plate to actuate switch E and reverse the lance travel so that it begins to move through the port 20a and inwardly of the furnace 10. That striker place also actuates switch H which reverses the polarity of the current to motor II.
  • the wiring schematics are merely illustrative of one means for carrying out the basic concepts of the present invention which provide a novel and unique system and method for overcoming problems of great concern in connection with the use of energy saving devices such as heat exchangers without requiring the expenditure of enormous energy for this purpose. Also, the result is accomplished without necessitating the use of expensive and complicated machinery. In effect, a continuous maintenance of the energy saving devices is accomplished efficiently by the incremental and total cleansing described in this specification.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
EP79301627A 1979-08-10 1979-08-10 Russbläservorrichtung Expired EP0023937B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP79301627A EP0023937B1 (de) 1979-08-10 1979-08-10 Russbläservorrichtung
DE7979301627T DE2967085D1 (en) 1979-08-10 1979-08-10 Soot blowing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP79301627A EP0023937B1 (de) 1979-08-10 1979-08-10 Russbläservorrichtung

Publications (2)

Publication Number Publication Date
EP0023937A1 true EP0023937A1 (de) 1981-02-18
EP0023937B1 EP0023937B1 (de) 1984-07-04

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ID=8186415

Family Applications (1)

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EP79301627A Expired EP0023937B1 (de) 1979-08-10 1979-08-10 Russbläservorrichtung

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EP (1) EP0023937B1 (de)
DE (1) DE2967085D1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0094910A1 (de) * 1982-05-17 1983-11-23 Emil Bader Verfahren und Vorrichtung zur Reinigung von Wärmetauschern
EP0617252A2 (de) * 1993-03-22 1994-09-28 THE BABCOCK & WILCOX COMPANY Offener Behälter für Russgebläse
WO2007085491A2 (de) 2006-01-30 2007-08-02 Gks - Gemeinschaftskraftwerk Gmbh Verfahren und vorrichtung zur reinigung von heizflächen in thermischen anlagen

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3068507A (en) * 1959-08-28 1962-12-18 Babcock & Wilcox Ltd Fluid heater cleaners
US3216046A (en) * 1963-06-05 1965-11-09 Diamond Power Speciality Long travel soot blower with telescopic feed tube
FR1421870A (fr) * 1965-01-21 1965-12-17 Diamond Power Speciality Perfectionnements aux souffleurs de suie
US3269659A (en) * 1964-12-18 1966-08-30 Halliburton Co Apparatus for cleaning the inside of bundled tubes
FR1473139A (fr) * 1966-01-17 1967-03-17 Nordon Fruhinsholz Diebold Perfectionnements apportés aux appareils du genre des foreuses pour le nettoyage des tubes d'échangeurs de température ou autres
FR1489867A (fr) * 1966-06-17 1967-07-28 Perfectionnements aux dispositifs de soufflage de suie
GB1100439A (en) * 1965-05-24 1968-01-24 Goodrich Co B F Production of 1,2-dichloroethane
US3794051A (en) * 1970-09-17 1974-02-26 Hydro Vel Services Inc Tube cleaning system
FR2347113A1 (fr) * 1976-04-05 1977-11-04 Nettoyage Ind Chimique Installation de nettoyage automatique d'echangeurs thermiques a faisceaux tubulaires

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184774A (en) * 1963-03-19 1965-05-25 United States Steel Corp Checker-cleaning apparatus
GB1160439A (en) * 1965-09-21 1969-08-06 Jean Eugene Julien Dulait Improvements to Soot Blowing Devices.

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3068507A (en) * 1959-08-28 1962-12-18 Babcock & Wilcox Ltd Fluid heater cleaners
US3216046A (en) * 1963-06-05 1965-11-09 Diamond Power Speciality Long travel soot blower with telescopic feed tube
US3269659A (en) * 1964-12-18 1966-08-30 Halliburton Co Apparatus for cleaning the inside of bundled tubes
FR1421870A (fr) * 1965-01-21 1965-12-17 Diamond Power Speciality Perfectionnements aux souffleurs de suie
GB1100439A (en) * 1965-05-24 1968-01-24 Goodrich Co B F Production of 1,2-dichloroethane
FR1473139A (fr) * 1966-01-17 1967-03-17 Nordon Fruhinsholz Diebold Perfectionnements apportés aux appareils du genre des foreuses pour le nettoyage des tubes d'échangeurs de température ou autres
FR1489867A (fr) * 1966-06-17 1967-07-28 Perfectionnements aux dispositifs de soufflage de suie
US3794051A (en) * 1970-09-17 1974-02-26 Hydro Vel Services Inc Tube cleaning system
FR2347113A1 (fr) * 1976-04-05 1977-11-04 Nettoyage Ind Chimique Installation de nettoyage automatique d'echangeurs thermiques a faisceaux tubulaires

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0094910A1 (de) * 1982-05-17 1983-11-23 Emil Bader Verfahren und Vorrichtung zur Reinigung von Wärmetauschern
EP0617252A2 (de) * 1993-03-22 1994-09-28 THE BABCOCK & WILCOX COMPANY Offener Behälter für Russgebläse
EP0617252A3 (de) * 1993-03-22 1994-11-17 Babcock & Wilcox Co Offener Behälter für Russgebläse.
WO2007085491A2 (de) 2006-01-30 2007-08-02 Gks - Gemeinschaftskraftwerk Gmbh Verfahren und vorrichtung zur reinigung von heizflächen in thermischen anlagen

Also Published As

Publication number Publication date
DE2967085D1 (en) 1984-08-09
EP0023937B1 (de) 1984-07-04

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