US3835817A - Apparatus for outside cleaning of boiler tubes - Google Patents

Apparatus for outside cleaning of boiler tubes Download PDF

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Publication number
US3835817A
US3835817A US00282053A US28205372A US3835817A US 3835817 A US3835817 A US 3835817A US 00282053 A US00282053 A US 00282053A US 28205372 A US28205372 A US 28205372A US 3835817 A US3835817 A US 3835817A
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tubes
impulse
boiler
striking
hammer
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US00282053A
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J Tuomaala
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Ahlstrom Corp
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Ahlstrom Corp
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28GCLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G7/00Cleaning by vibration or pressure waves

Definitions

  • the mechanical impulse is directed at the [58] Fieid /8g4 tubes or a part thereof immediately connected to the 173/99 1 18 tubes.
  • Such mechanical vibration may be created with the help of a striking hammer provided with a suitable [56] References Cited spring system to give the desired frequency or with the help of, e.g., a periodically working thyristor- UNITED STATES PATENTS gulded magnetiavlbrator. 1,124,393 1/1915 Coates... 173/99 2,183,496 12/1939 Peters 122/379 x 5 Clalms, 2 Drawing gu s 2,550,676 5/1951 Dalin /84 X 2,655,911 10/1953 Van Russum et al..
  • the present invention relates to boilers and more particularly to the outside cleaning of boiler tubes or similar.
  • the invention provides a device for cleaning such tubes by imparting them to mechanical impulses or vibration.
  • Boiler tubes have usually been cleaned by striking the tube loops against each other.
  • the limited back-andforth movement of tube elements required for this has been obtained with the help of a working cylinder, a wabbler, or the like.
  • One such device has been introduced in Finnish Pat. No. 44,027.
  • the disadvantage of such device is the excessive length of the stroke, which is also harmful when the apparatus has not been in operation and ashes have accumulated between the shock plates. In such a case the ashes cushion the shock and may even prevent the entire movement and stop the apparatus.
  • the method of cleaning the tubes by striking them against each other has been known for a long time.
  • Another known method is to conduct a shock to the tubes with striking bars extending through the boiler wall.
  • the shock creates the greatest acceleration at comparatively high frequencies, about 400 Hz.
  • the acceleration obtained at high frequencies falls sharply. This is most probably due to the fact that material yields close to the static yield point even with a shorttime load effect.
  • the objective is the highest possible acceleration on the tube surface.
  • a low-frequency vibration of a few tens of Hz can be easily obtained even in hot tubes. If an attempt is made to create sufficient acceleration with the help of this, the amplitude grows too much and the deformation load of the tubes surpasses the mechanical tolerance of the tubes.
  • the frequency of some 1,000 Hz is very practical. Sufficient acceleration values can be obtained with it without overloading the tubes, and it will not be reduced too much even in hot tubes. However, it is difficult to create this frequency, for the frequency is too high for an ordinary vibrator and cannot be obtained in hot tubes by striking them with an ordinary hammer.
  • the purpose of the present invention is to eliminate the above disadvantage and provide a device with which vibration of the desired frequency can be obtained.
  • a device of the character once described which comprises means for directing a mechanical impulse, the frequency of which is 200 2,000 Hz, most suitably about 1,000 Hz, at the tubes or a part immediately con nected with them outside the furnace of the boiler.
  • Such mechanical impulses may be created, e.g., with the help of a hammer provided with a spring such as a spring disk with such a stiffness that the mass of the hammer supported by it forms a vibration system with a frequency of about 1,000 Hz, an apparatus is obtained the stroke of which creates an effective impulse producing a frequency of 1,000 Hz.
  • the created impulse is really effective, for its shape is correct (sineshaped), and the hammer bounces back.
  • the impulse is similar to that created when struck with a lead hammer.
  • the invention consists of a impulse-giving device producing a frequency of about 1,000 Hz (200 2,000 Hz). It can comprise a springed hammer, but also a periodically working thyristor-guided magnetic vibrator. It is characterized by the shortness of the impulse; this prevents the formation of resonance vibrations in the tubes and thereby prevents resonance damage. It can be applied to the block connecting the tube loops, the division block, and thereby through the ceiling to the tubes, vibration of the tube cover and also vibration of the walls.
  • FIG. 1 shows schematically an apparatus according to the invention in which the stroke is directed at the end of the division block situated outside the boiler, and
  • FIG. 2 shows that end of the block connecting the tube group at which the stroke is directed.
  • 1 refers to the ceiling of the furnace of the boiler through which tubes 2 run.
  • the division block from which tubes 2 start is indicated by 3.
  • the division block 3 is surrounded by an insulation 4, and the end 5 of the division block extends outside the insulation.
  • Driving force is transmitted from a driving shaft 6, which runs through the boiler wall, by a coupler transmission 7 to a wheel 8.
  • a plate 9 rotates with the wheel 8 in the direction shown by the arrow.
  • a hammer 10 has been attached to the plate 9 with bearings at point 11. In the plate 9 there is also a lifting pin 12 for the hammer.
  • the pin When the plate rotates, the pin lifts the hammer 10, a disk spring pair 13 having been attached to its end, to the striking position from which it swings down by its own weight and strikes the end of the division block, at which time high vibrations are created the acceleration of which is sufficient to shake the scoria from the tubes in the furnace.
  • the high-frequency vibration is absorbed very quickly, but on the other hand it proceeds along the tube very effectively, even through the ceiling.
  • the block connecting the tubes is indicated by 14, and the stroke is directed at point 15 of the block.
  • the strokes of the hammer 10 can be most suitably arranged so that they occur at about 2 l0 times/minute.
  • a device for outside cleaning of boiler tubes by means of tube vibration obtained with an impulse comprising: a rotating plate indirectly driven by a throughgoing driving shaft, hammer means attached with bearings to said rotating plate, said hammer means having a pair of disk springs resiliently attached to the striking end thereof, and mounted in relationship to the tubes to exert a mechanical impulse thereon by striking the desired point of impulse exertion always with the of the boiler? 4.
  • said part upon which the impulse is exerted is a connecting block constructed at the bends of the tube loops.
  • a device wherein the rotating plate is provided with a lifting pin for lifting the hammer means to striking position from which it falls by its own weight and strikes said desired point.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cleaning In General (AREA)
  • Incineration Of Waste (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

There is provided a device for outside cleaning of boiler tubes and similar, wherein the tubes are imparted to mechanical impulses or vibration within the frequency range of 200 - 2,000 Hz, suitable at about 1,000 Hz. The mechanical impulse is directed at the tubes or a part thereof immediately connected to the tubes. Such mechanical vibration may be created with the help of a striking hammer provided with a suitable spring system to give the desired frequency or with the help of, e.g., a periodically working thyristor-guided magnetic vibrator.

Description

United States Patent 1191 Tuomaala Sept. 17, 1974 [54] gg fig ggigg OUTSIDE CLEANING OF FOREIGN PATENTS OR APPLICATIONS 789,927 7/1968 Canada 165/84 [75] Inventor: Jorma Aarne Kullervo Tuomaala, 592,612 /1925 France..... Karhula, Finland 1,045,678 7/1953 France 165/84 73 A 1 A. l k ht' l sslgnee gg g gg gf g Primary ExaminerAlbert W. Davis, Jr.
Attorney, Agent, or Firm-Cushman, Darby and 122] Filed: Aug. 21, 1972 Cushman [21] Appl. No.: 282,053 V 57 ABSTRACT Foreign Application Priority Data 1 Aug. 19,1971 Finland 2316/71 There Pmvlded device for outslde Cleamng T boiler tubes and similar, wherein the tubes are imparted to meghanical impulses 0 yi bra tion within the [52] US. Cl ll7232/g39791,7l36/5l/1884,#1719256 frequency range of 200 2,000 Hz, Suitable at about [51] lm Cl 1 7/00 1,000 Hz. The mechanical impulse is directed at the [58] Fieid /8g4 tubes or a part thereof immediately connected to the 173/99 1 18 tubes. Such mechanical vibration may be created with the help of a striking hammer provided with a suitable [56] References Cited spring system to give the desired frequency or with the help of, e.g., a periodically working thyristor- UNITED STATES PATENTS gulded magnetiavlbrator. 1,124,393 1/1915 Coates... 173/99 2,183,496 12/1939 Peters 122/379 x 5 Clalms, 2 Drawing gu s 2,550,676 5/1951 Dalin /84 X 2,655,911 10/1953 Van Russum et al.. 173/99 7 3,225,596 1 /1967 Ostrofsky et 1 6 5 8 4 APPARATUS FOR OUTSIDE CLEANING OF BOILER TUBES BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to boilers and more particularly to the outside cleaning of boiler tubes or similar. The invention provides a device for cleaning such tubes by imparting them to mechanical impulses or vibration.
2. Description of the Prior Art Boiler tubes have usually been cleaned by striking the tube loops against each other. The limited back-andforth movement of tube elements required for this has been obtained with the help of a working cylinder, a wabbler, or the like. One such device has been introduced in Finnish Pat. No. 44,027.
The disadvantage of such device is the excessive length of the stroke, which is also harmful when the apparatus has not been in operation and ashes have accumulated between the shock plates. In such a case the ashes cushion the shock and may even prevent the entire movement and stop the apparatus.
The method of cleaning the tubes by striking them against each other has been known for a long time. Another known method is to conduct a shock to the tubes with striking bars extending through the boiler wall. The shock creates the greatest acceleration at comparatively high frequencies, about 400 Hz. However, if the temperature of the tubes is raised, as in a boiler, the acceleration obtained at high frequencies falls sharply. This is most probably due to the fact that material yields close to the static yield point even with a shorttime load effect.
The objective is the highest possible acceleration on the tube surface. A low-frequency vibration of a few tens of Hz can be easily obtained even in hot tubes. If an attempt is made to create sufficient acceleration with the help of this, the amplitude grows too much and the deformation load of the tubes surpasses the mechanical tolerance of the tubes.
The frequency of some 1,000 Hz is very practical. Sufficient acceleration values can be obtained with it without overloading the tubes, and it will not be reduced too much even in hot tubes. However, it is difficult to create this frequency, for the frequency is too high for an ordinary vibrator and cannot be obtained in hot tubes by striking them with an ordinary hammer.
The purpose of the present invention is to eliminate the above disadvantage and provide a device with which vibration of the desired frequency can be obtained.
SUMMARY OF THE INVENTION According to the present invention there is provided a device of the character once described, which comprises means for directing a mechanical impulse, the frequency of which is 200 2,000 Hz, most suitably about 1,000 Hz, at the tubes or a part immediately con nected with them outside the furnace of the boiler.
Such mechanical impulses may be created, e.g., with the help of a hammer provided with a spring such as a spring disk with such a stiffness that the mass of the hammer supported by it forms a vibration system with a frequency of about 1,000 Hz, an apparatus is obtained the stroke of which creates an effective impulse producing a frequency of 1,000 Hz. The created impulse is really effective, for its shape is correct (sineshaped), and the hammer bounces back. When a hot tube is struck with a stiff hammer, the impulse is similar to that created when struck with a lead hammer.
Thus, the invention consists of a impulse-giving device producing a frequency of about 1,000 Hz (200 2,000 Hz). It can comprise a springed hammer, but also a periodically working thyristor-guided magnetic vibrator. It is characterized by the shortness of the impulse; this prevents the formation of resonance vibrations in the tubes and thereby prevents resonance damage. It can be applied to the block connecting the tube loops, the division block, and thereby through the ceiling to the tubes, vibration of the tube cover and also vibration of the walls.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows schematically an apparatus according to the invention in which the stroke is directed at the end of the division block situated outside the boiler, and
FIG. 2 shows that end of the block connecting the tube group at which the stroke is directed.
DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, 1 refers to the ceiling of the furnace of the boiler through which tubes 2 run. The division block from which tubes 2 start is indicated by 3. The division block 3 is surrounded by an insulation 4, and the end 5 of the division block extends outside the insulation. Driving force is transmitted from a driving shaft 6, which runs through the boiler wall, by a coupler transmission 7 to a wheel 8. A plate 9 rotates with the wheel 8 in the direction shown by the arrow. A hammer 10 has been attached to the plate 9 with bearings at point 11. In the plate 9 there is also a lifting pin 12 for the hammer. When the plate rotates, the pin lifts the hammer 10, a disk spring pair 13 having been attached to its end, to the striking position from which it swings down by its own weight and strikes the end of the division block, at which time high vibrations are created the acceleration of which is sufficient to shake the scoria from the tubes in the furnace.
The high-frequency vibration is absorbed very quickly, but on the other hand it proceeds along the tube very effectively, even through the ceiling.
In FIG. 2, the block connecting the tubes is indicated by 14, and the stroke is directed at point 15 of the block.
The strokes of the hammer 10 can be most suitably arranged so that they occur at about 2 l0 times/minute.
The invention is not limited to the solution described above and illustrated in the figures; it can be varied in many ways within the following claims.
I claim:
1. A device for outside cleaning of boiler tubes by means of tube vibration obtained with an impulse, said device comprising: a rotating plate indirectly driven by a throughgoing driving shaft, hammer means attached with bearings to said rotating plate, said hammer means having a pair of disk springs resiliently attached to the striking end thereof, and mounted in relationship to the tubes to exert a mechanical impulse thereon by striking the desired point of impulse exertion always with the of the boiler? 4. A device according to claim 2, wherein said part upon which the impulse is exerted is a connecting block constructed at the bends of the tube loops.
5. A device according to claim 1, wherein the rotating plate is provided with a lifting pin for lifting the hammer means to striking position from which it falls by its own weight and strikes said desired point.

Claims (5)

1. A device for outside cleaning of boiler tubes by means of tube vibration obtained with an impulse, said device comprising: a rotating plate indirectly driven by a throughgoing driving shaft, hammer means attached with bearings to said rotating plate, said hammer means having a pair of disk springs resiliently attached to the striking end thereof, and mounted in relationship to the tubes to exert a mechanical impulse thereon by striking the desired point of impulse exertion always with the same force and at the same rate, the frequency of said impulse being in the range of 200-2,000 Hz, preferably about 1,000 Hz.
2. A device according to claim 1, wherein said hammer means is arranged to exert the mechanical impulse on a part immediately connected with the tubes outside the furnace of the boiler.
3. A device according to claim 2, wherein said part upon which the impulse is exerted is the division block of the boiler.
4. A device according to claim 2, wherein said part upon which the impulse is exerted is a connecting block constructed at the bends of the tube loops.
5. A device according to claim 1, wherein the rotating plate is provided with a lifting pin for lifting the hammer means to striking position from which it falls by its own weight and strikes said desired point.
US00282053A 1971-08-19 1972-08-21 Apparatus for outside cleaning of boiler tubes Expired - Lifetime US3835817A (en)

Applications Claiming Priority (1)

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FI712316A FI52147C (en) 1971-08-19 1971-08-19 Method and apparatus for external cleaning of the boiler piping

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US3835817A true US3835817A (en) 1974-09-17

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DE (1) DE2240250C2 (en)
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SE (1) SE380893B (en)
SU (1) SU556739A3 (en)

Cited By (46)

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US3920085A (en) * 1974-11-11 1975-11-18 Universal Oil Prod Co Swing hammer rapping system for electrostatic precipitator
US3997000A (en) * 1975-09-25 1976-12-14 Dominion Bridge Company, Limited Mechanical cleaning device for boilers with gas flow containing sticky dust
US4018267A (en) * 1975-01-10 1977-04-19 Dorr-Oliver Incorporated Cleaning heat exchanger tubes
US4077465A (en) * 1975-08-15 1978-03-07 The Electricity Council Boilers
US4167209A (en) * 1975-08-15 1979-09-11 The Electricity Council Boilers
US4396434A (en) * 1980-11-26 1983-08-02 Somalor-Ferrari "Somafer" Sa Process for cleaning surfaces fouled by deposits resulting from combustion of carbon-bearing substances
EP0093570A2 (en) * 1982-05-03 1983-11-09 The Babcock & Wilcox Company Boiler systems
US4421067A (en) * 1982-09-07 1983-12-20 Deltak Corporation Apparatus and method for soot cleaning in high-pressure heat exchangers
US4430948A (en) * 1981-10-07 1984-02-14 Western Heating, Inc. Fuel stoker and furnace
US4454860A (en) * 1981-10-07 1984-06-19 Stephen A. Schafer Fuel stoker and furnace
US4497282A (en) * 1983-11-23 1985-02-05 Neundorfer, Inc. Apparatus for deslagging steam generator tubes
US4741292A (en) * 1986-12-22 1988-05-03 The Babcock & Wilcox Company Electro-impulse rapper system for boilers
USRE32723E (en) * 1983-11-23 1988-08-02 Neundorfer, Inc. Apparatus for deslagging steam generator tubes
US4836146A (en) * 1988-05-19 1989-06-06 Shell Oil Company Controlling rapping cycle
US4841917A (en) * 1987-07-31 1989-06-27 L. & C. Steinmuller Gmbh Radiation cooling unit for cooling dust-laden gases
US4893588A (en) * 1987-10-29 1990-01-16 Schmidt'sche Heissdampf Gmbh Adaptive control technique for steam generator cleaning
US5056587A (en) * 1990-09-07 1991-10-15 Halliburton Company Method for deslagging a boiler
US5079459A (en) * 1991-01-23 1992-01-07 The Babcock & Wilcox Company Electro-hammer rapper
US5238055A (en) * 1992-05-13 1993-08-24 The Babcock & Wilcox Company Field adjustable rapper tie bar
US5315966A (en) * 1993-01-18 1994-05-31 Serge Gamache Hammering device for tube boilers
US5540275A (en) * 1995-03-17 1996-07-30 Foster Wheeler Energy Corporation Single impact rapping hammer system and method for cleaning tube units
US5765510A (en) * 1996-04-26 1998-06-16 Dltk, Inc. Retractable, sealed sootblower for high pressure, high temperature applications
US5873408A (en) * 1996-04-24 1999-02-23 Naphtachimie Method and apparatus for heat treating substances flowing along a duct
WO2002016053A1 (en) * 2000-08-22 2002-02-28 Moiseichev, Alexandr Viktorovich Method for protecting surfaces of ferromagnetic materials from sediments and for removing said sediments from the surfaces
WO2003052318A1 (en) * 2001-12-19 2003-06-26 Gemeente Amsterdam Steam super heater comprising unround pipes
US20060278368A1 (en) * 2004-02-10 2006-12-14 Peter Dawson Apparatus for cleaning heat exchanger plates and a bulk material heat exchanger using the same
US20070068654A1 (en) * 2005-09-23 2007-03-29 Hon Hai Precision Industry Co., Ltd. Heat dissipation system and method for making same
US20070144631A1 (en) * 2005-12-21 2007-06-28 Exxonmobil Research And Engineering Company Method for reducing fouling in a refinery
US20070158054A1 (en) * 2005-12-21 2007-07-12 Greaney Mark A Corrosion resistant material for reduced fouling, a heat transfer component having reduced fouling and a method for reducing fouling in a refinery
US20070178322A1 (en) * 2005-12-21 2007-08-02 Exxonmobil Research And Engineering Company Silicon-containing steel composition with improved heat exchanger corrosion and fouling resistance
US20070267176A1 (en) * 2006-05-19 2007-11-22 Exxonmobil Research And Engineering Company Mitigation of in-tube fouling in heat exchangers using controlled mechanical vibration
US20070267175A1 (en) * 2006-05-19 2007-11-22 Exxon Mobil Research And Engineering Company Device for generating acoustic and/or vibration energy for heat exchanger tubes
US20080073063A1 (en) * 2006-06-23 2008-03-27 Exxonmobil Research And Engineering Company Reduction of fouling in heat exchangers
US20080121373A1 (en) * 2006-11-23 2008-05-29 Inventec Corporation Heat-dissipation device with dust-disposal function
US20080149308A1 (en) * 2006-12-20 2008-06-26 Limin Song Vibration actuation system with independent control of frequency and amplitude
US20090090613A1 (en) * 2007-10-05 2009-04-09 Exxonmobil Research And Engineering Company Crude oil pre-heat train with improved heat transfer and method of improving heat transfer
US20100108340A1 (en) * 2006-12-14 2010-05-06 Foster Wheeler Energia Oy Impact Rapping Device
WO2011003890A1 (en) * 2009-07-09 2011-01-13 Shell Internationale Research Maatschappij B.V. Heat exchanger
DE102007024286B4 (en) * 2006-06-06 2012-07-19 Alstom Technology Ltd. Boiler pipe wall and device for its cleaning
US20160116158A1 (en) * 2014-10-24 2016-04-28 Hrst, Inc. Tube spreading device and boiler cleaning system
CN105798022A (en) * 2016-05-10 2016-07-27 钱伟 Tube row beating device for energy gathering device
DE102015010307A1 (en) 2015-08-07 2017-02-09 Steinmüller Babcock Environment Gmbh Device for introducing impact forces into a heating surface
JP2019211156A (en) * 2018-06-05 2019-12-12 Jfeエンジニアリング株式会社 Dust removing device of heat transfer tube
WO2021037372A1 (en) 2019-08-29 2021-03-04 Sumitomo SHI FW Energia Oy Spring hammer for rapping a surface
CN112696948A (en) * 2020-12-25 2021-04-23 常州英索兰换热器有限公司 Corrosion-resistant flue gas plate heat exchanger
IT202100012674A1 (en) * 2021-05-17 2022-11-17 Francesco Folli BUMPER FOR PERCUSSION CLEANING OF STEAM BOILERS

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DE2710153C2 (en) * 1977-03-09 1985-06-20 Alexander Bock Device for intermittent cleaning of soiled surfaces
DE3334456C2 (en) * 1983-09-23 1986-06-12 L. & C. Steinmüller GmbH, 5270 Gummersbach Device for power transmission
IT1167248B (en) * 1983-10-05 1987-05-13 Redecam Srl HEAT EXCHANGE SYSTEM FOR FLUIDS WITH SUSPENSION PARTICLES
DE3503605C2 (en) * 1985-02-02 1995-03-09 Erk Eckrohrkessel Knock cleaning device built into the boiler
DE3524264A1 (en) * 1985-07-06 1987-01-08 Erk Eckrohrkessel Scalable pipe grid
DE3741378A1 (en) * 1987-12-07 1989-06-15 Oschatz Gmbh DEVICE FOR CLEANING A HEATING AREA, IN PARTICULAR A BOILER SYSTEM
DE3819941A1 (en) * 1988-06-11 1989-12-21 Heinz Hilke Method for cleaning the tubes in a steam generator, and device for carrying out the method
DE3942759C1 (en) * 1989-12-23 1991-06-06 Oschatz Gmbh, 4300 Essen, De Cleaner for boiler ducts - has anvil impacted by hammer to transfer impact force onto wall
DK173090B1 (en) * 1997-11-11 2000-01-10 Fls Miljoe As Waste incineration boiler
DE19810732B4 (en) * 1998-03-12 2006-09-28 Oschatz Gmbh Device for cleaning in particular waste heat boiler components
DE102005045633B3 (en) * 2005-09-23 2007-05-16 Alstom Technology Ltd Monkey tapping device
CN102371258A (en) * 2011-11-17 2012-03-14 河南龙工机械制造有限公司 Knocking-type slag cleaning device

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FR592612A (en) * 1925-02-04 1925-08-06 Automatic hammer drill
US2183496A (en) * 1937-11-15 1939-12-12 La Mont Corp Cleaning tubular heat exchanging surfaces
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Cited By (78)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920085A (en) * 1974-11-11 1975-11-18 Universal Oil Prod Co Swing hammer rapping system for electrostatic precipitator
US4018267A (en) * 1975-01-10 1977-04-19 Dorr-Oliver Incorporated Cleaning heat exchanger tubes
US4077465A (en) * 1975-08-15 1978-03-07 The Electricity Council Boilers
US4167209A (en) * 1975-08-15 1979-09-11 The Electricity Council Boilers
US3997000A (en) * 1975-09-25 1976-12-14 Dominion Bridge Company, Limited Mechanical cleaning device for boilers with gas flow containing sticky dust
US4396434A (en) * 1980-11-26 1983-08-02 Somalor-Ferrari "Somafer" Sa Process for cleaning surfaces fouled by deposits resulting from combustion of carbon-bearing substances
US4430948A (en) * 1981-10-07 1984-02-14 Western Heating, Inc. Fuel stoker and furnace
US4454860A (en) * 1981-10-07 1984-06-19 Stephen A. Schafer Fuel stoker and furnace
US4442800A (en) * 1982-05-03 1984-04-17 The Babcock & Wilcox Company Single drum all-welded boiler
EP0093570A3 (en) * 1982-05-03 1985-10-09 The Babcock & Wilcox Company Boiler systems
EP0254379A1 (en) * 1982-05-03 1988-01-27 The Babcock & Wilcox Company Boilers systems
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Also Published As

Publication number Publication date
FI52147C (en) 1977-06-10
DE2240250C2 (en) 1982-07-22
DE2240250A1 (en) 1973-02-22
JPS4835205A (en) 1973-05-24
SU556739A3 (en) 1977-04-30
FI52147B (en) 1977-02-28
SE380893B (en) 1975-11-17

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