US3835817A - Apparatus for outside cleaning of boiler tubes - Google Patents
Apparatus for outside cleaning of boiler tubes Download PDFInfo
- 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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- United States
- Prior art keywords
- tubes
- impulse
- boiler
- striking
- hammer
- 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.)
- Expired - Lifetime
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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
- F28G7/00—Cleaning 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.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI712316A FI52147C (en) | 1971-08-19 | 1971-08-19 | Method and apparatus for external cleaning of the boiler piping |
Publications (1)
Publication Number | Publication Date |
---|---|
US3835817A true US3835817A (en) | 1974-09-17 |
Family
ID=8506934
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00282053A Expired - Lifetime US3835817A (en) | 1971-08-19 | 1972-08-21 | Apparatus for outside cleaning of boiler tubes |
Country Status (6)
Country | Link |
---|---|
US (1) | US3835817A (en) |
JP (1) | JPS4835205A (en) |
DE (1) | DE2240250C2 (en) |
FI (1) | FI52147C (en) |
SE (1) | SE380893B (en) |
SU (1) | SU556739A3 (en) |
Cited By (46)
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 |
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 |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
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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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-
1971
- 1971-08-19 FI FI712316A patent/FI52147C/en active
-
1972
- 1972-08-16 DE DE2240250A patent/DE2240250C2/en not_active Expired
- 1972-08-17 SE SE7210700A patent/SE380893B/en unknown
- 1972-08-17 SU SU1821030A patent/SU556739A3/en active
- 1972-08-18 JP JP47082229A patent/JPS4835205A/ja active Pending
- 1972-08-21 US US00282053A patent/US3835817A/en not_active Expired - Lifetime
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CA789927A (en) * | 1968-07-16 | Izrailevich Kropp Leonid | Device for vibrational cleaning of tubular heating surfaces in heat exchange plants from external contaminations mainly slag and ash | |
US1124393A (en) * | 1910-03-21 | 1915-01-12 | George H Coates | Mechanical hammer. |
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 |
US2550676A (en) * | 1945-06-20 | 1951-05-01 | Dalin David | Combined waste-heat boiler and chemical recovery unit |
US2655911A (en) * | 1948-12-09 | 1953-10-20 | Pierre Van Russum | Percussion mechanism |
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Cited By (78)
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 |
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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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