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US20080216277A1 - Varying helical sootblower - Google Patents

Varying helical sootblower Download PDF

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Publication number
US20080216277A1
US20080216277A1 US11/773,358 US77335807A US2008216277A1 US 20080216277 A1 US20080216277 A1 US 20080216277A1 US 77335807 A US77335807 A US 77335807A US 2008216277 A1 US2008216277 A1 US 2008216277A1
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United States
Prior art keywords
sootblower
drive shaft
lance
hub
rotational
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.)
Abandoned
Application number
US11/773,358
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English (en)
Inventor
W. Wayne Holden
Michael C. Holden
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.)
HOLDEN INDUSTRIES LLC
HOLDEN Ind LLC
Original Assignee
HOLDEN Ind LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HOLDEN Ind LLC filed Critical HOLDEN Ind LLC
Priority to US11/773,358 priority Critical patent/US20080216277A1/en
Assigned to HOLDEN INDUSTRIES, LLC reassignment HOLDEN INDUSTRIES, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HOLDEN, MICHAEL C., HOLDEN, W. WAYNE
Priority to PCT/US2008/056412 priority patent/WO2008109885A1/fr
Publication of US20080216277A1 publication Critical patent/US20080216277A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
    • F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
    • F23J3/023—Cleaning furnace tubes; Cleaning flues or chimneys cleaning the fireside of watertubes in boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices or arrangements for removing water, minerals or sludge from boilers ; Arrangement of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/52—Washing-out devices

Definitions

  • Embodiments disclosed herein generally relate to sootblowers. More specifically, embodiments disclosed herein relate to an improved sootblower used to project a stream of a sootblower medium within a combustion device.
  • sootblowers may be used to provide a substantially continuous cleaning of the interior surfaces of the boilers.
  • sootblowers are permanently installed between adjacent rows of heat exchanger tubes within a boiler so that the sootblowers may provide regular, if not substantially continuous, cleaning without the need for the boiler to be taken out of service during the cleaning.
  • each sootblower may be operated on a regular cycle, such as about once an hour, depending on the size of the boiler and severity of the accumulation of particulate matter.
  • sootblower is a long retracting sootblower. Examples of such sootblowers are shown and described in U.S. Pat. Nos. 5,675,863 and 5,745,950, which is incorporated by reference in its entirety. These sootblowers generally include a long pipe or lance having a nozzle at the end for directing a blowing medium, such as steam or another vapor, onto the surfaces of the heat exchanger tubes.
  • An example of a lance 102 cleaning a boiler 190 is shown in FIG. 1 .
  • Lance 102 having nozzles 104 at an end for directing a blowing medium 106 , is inserted through a hole 194 of a wall 192 of boiler 190 .
  • Lance 102 should be sufficient in length such that the entire length of heat exchanger tubes 196 of boiler 190 may be accessed by lance 102 .
  • Lance 102 is then usually attached to a moveable carriage or housing with a motor (not shown) to reciprocate and rotate (as indicated by arrows) lance 102 within boiler 190 for effective cleaning.
  • lance 102 upon actuation, will reciprocate into boiler 190 and rotate at a generally continuous speed.
  • Blowing medium 106 is exerted through nozzles 104 as lance 102 is in motion, thereby blowing off accumulated particle matter 198 and cleaning heat exchanger tubes 196 .
  • the lance When actuated and reciprocated into and out-of the boiler, the lance generally will follow a standard helical path, as shown in FIG. 2A .
  • the nozzle of the lance may follow path 280 when extended into and retracted from the boiler.
  • path 280 substantial portions of the boiler and the heat exchanger tubes may fail to be reached by blowing medium from the nozzle of the lance.
  • particulate matter may still accumulate on the boiler's internal surfaces and heat exchanger tubes that do not fall within path 280 of the nozzle of the lance.
  • the nozzle of the lance may incorporate a phase-shift into the standard helical path.
  • phase-shift may include temporarily stopping the rotation of the lance, thereby providing more coverage when cleaning the sootblowers.
  • the nozzle may follow a first extension path 282 .
  • the lance and nozzle may shift phase, for example, by about 30 degrees, so that as the lance is retracted, the nozzle on the lance may follow a first retraction path 284 , distinct from first extension path 282 .
  • the lance and nozzle may shift phase again, by about 15 degrees, so that the lance is extended into the boiler along a second extension path 286 , distinct from first extension and retraction paths 282 and 284 . Then, upon retraction from the boiler, the nozzle and lance may shift phase again, by about another 30 degrees, so that the lance may follow a second retraction path 288 , distinct from previous paths 282 , 284 , and 286 .
  • the path of the nozzle may be improved to cover more area than that of the standard helical path, as shown in FIG. 2A .
  • inventions disclosed herein relate to a sootblower to project a blowing medium into a boiler.
  • the sootblower includes a drive shaft configured to axially insert a lance into a boiler when rotated in a first direction and axially remove the lance from the boiler when rotated in a second direction.
  • the drive shaft is configured to engage a first rotational mechanism when rotated in the first direction, in which the first rotational mechanism is configured to rotate the lance with respect to the boiler in a rotational direction at a first ratio relative to the drive shaft.
  • the drive shaft is configured to engage a second rotational mechanism when rotated in the second direction, in which the second rotational mechanism is configured to rotate the lance with respect to the boiler in the rotational direction at a second ratio relative to the drive shaft.
  • inventions disclosed herein relate to a sootblower to project a blowing medium.
  • the sootblower includes a hub disposed within a housing, in which a first end of the hub is configured to receive a lance and a second end of the hub is configured to receive the blowing medium.
  • the sootblower further includes a drive assembly configured to convert bidirectional rotational motion from a drive shaft into unidirectional rotational motion for a hub, in which a ratio of a first direction of the bidirectional rotational motion to the unidirectional rotational motion varies from a ratio of a second direction of the bidirectional rotational motion to the unidirectional rotational motion.
  • FIG. 1 shows a view of a prior art lance attached to a sootblower.
  • FIGS. 2A and 2B show a view of helical paths of a prior art sootblower.
  • FIG. 3 shows a top-down view of a sootblower in accordance with embodiments disclosed herein.
  • FIG. 4 shows a cross-sectional view taken along line A-A of the sootblower shown in FIG. 3 in accordance with embodiments disclosed herein.
  • FIG. 5 shows a cross-sectional view of a motor and a sootblower in accordance with embodiments disclosed herein.
  • FIG. 6 shows a cross-sectional view taken along line B-B of the sootblower shown in FIG. 4 in accordance with embodiments disclosed herein.
  • FIG. 7 shows a cross-sectional view taken along line B-B of the sootblower shown in FIG. 4 in accordance with embodiments disclosed herein.
  • FIG. 8 shows a view of helical paths of a sootblower in accordance with embodiments disclosed herein.
  • embodiments disclosed herein relate to an improved sootblower with a drive assembly configured to supply different ratios of translational motion to rotational motion as a lance of the sootblower is extended into and retracted from a boiler.
  • embodiments disclosed herein relate to a sootblower having a hub and a lance positioned substantially on a vertical centerline of the sootblower.
  • embodiments disclosed herein relate to a drive shaft having two one-way rotational mechanisms attached thereto in opposing directions such that as the drive shaft is rotated, one of the one-way rotational mechanisms is activated and imparts motion to the hub while the other of the one-way rotational mechanisms is deactivated.
  • Sootblower 300 in accordance with embodiments disclosed herein is shown.
  • Sootblower 300 includes a housing 301 configured to receive a lance 302 .
  • Lance 302 may have a long, tubular construction and include one or more nozzles 304 .
  • nozzle 304 preferably a venturi nozzle, is disposed at the end of lance 302 .
  • the nozzle may be disposed at any location on or about the lance.
  • lance 302 is configured to connect with a hub 310 , such as connecting a flange 308 of lance 302 with a flange 312 of hub 310 .
  • Hub 310 may be rotationally disposed within housing 301 such that hub 310 is able to rotate with respect to housing 301 . As such, when hub 310 rotates, lance 302 will accordingly rotate therewith. Further, hub 310 is configured to receive a blowing medium, such as through a feed tube 317 . As shown, a valve 316 may supply the blowing medium to feed tube 317 , in which the blowing medium may then be transported through hub 310 to lance 302 to exert the blowing medium through nozzle 304 .
  • the blowing medium used is steam, such as superheated steam of about 750° F. (400° C.); however, any high-pressure and/or high-temperature vapor or gas known in the art may be used.
  • Sootblower 300 further includes a motor 318 configured to supply power and provide rotational movement to hub 310 and translational movement to housing 301 .
  • motor 318 rotates hub 310 and lance 302 , in addition to moving housing 301 along tracks 322 .
  • rollers 320 may be rotatably attached to housing 301 through, for example, legs 324 attached to housing 301 . Rollers 320 may then travel along tracks 322 to support the weight and enable translational movement for sootblower 300 .
  • the lance of the sootblower may be reciprocated into and out-of the boiler while rotating.
  • sootblower 300 may include intermediate supports (not shown) disposed underneath lance 302 and/or feed tube 317 to prevent excessive bending or deflection thereof. As such, the intermediate supports may attach to one of tracks 322 to support lance 302 and feed tube 317 . This arrangement of the intermediate supports attached to only one of tracks 322 may allow necessary electrical cords and power to be distributed to motor 318 and housing 301 outside and along the other of tracks 322 .
  • An example of motor 318 that may be used within sootblower 300 is a 1,750 revolutions per minute, 2 horsepower electric motor. Those having ordinary skill in the art will appreciate that any suitable motor may be used.
  • Sootblower 300 includes a drive assembly 330 disposed within housing 301 .
  • drive assembly 300 is configured to receive bidirectional rotation from the motor (e.g., 318 shown in FIG. 3 ) of the sootblower. This bidirectional rotation is then converted by drive assembly 330 into unidirectional rotation for hub 310 .
  • the housing of the sootblower travels back-and-forth along the tracks to extend and retract the lance within the boiler, the lance remains rotating in the same direction.
  • the motor and the hub/lance may rotate in the clockwise direction.
  • the motor may reverse directions to rotate in the counter-clockwise direction, while the hub/lance remains to rotate in the clockwise direction.
  • bidirectional rotation from the motor is converted into unidirectional rotation for the hub and the lance attached thereto. This conversion of bidirectional rotation to unidirectional rotation is described further below.
  • motor 318 provides bidirectional rotational movement to a drive shaft 340 of drive assembly 330 .
  • motor 318 may provide bidirectional rotation to a worm 326 .
  • Worm 326 disposed within housing 301 , is also configured to bidirectionally rotate, corresponding to the bidirectional rotation of motor 318 .
  • Worm 326 is then configured to engage a worm gear 342 attached to drive shaft 340 .
  • worm gear 342 is configured to bidirectionally rotate drive shaft 340 from engagement with worm 326 .
  • the arrangement of worm 326 and worm gear 342 may take advantage of ratios of revolutions therebetween, in which the ratio of revolutions of the worm to the worm gear may be of the magnitude of about 1:36.
  • the invention is not so limited, and any arrangement and ratio between the worm and the worm gear may be used.
  • Drive shaft 340 powered by motor 318 using, for example, worm 326 and worm gear 342 , is used to provide translational motion for housing 301 , and also provide rotational motion to hub 310 .
  • pinion gears 346 may be attached to the ends of drive shaft 340 .
  • Pinion gears 346 may be configured to engage a rack (not shown) attached or formed to tracks 322 (shown in FIG. 3 ).
  • teeth of pinion gears 346 may be configured to engage teeth of the rack to transfer the rotational motion of pinion gears 346 and drive shaft 340 into translational motion for housing 301 of sootblower 300 .
  • the translational direction of housing 301 may be controlled through drive shaft 340 within pinion gears 346 and the rack.
  • rotational mechanisms 350 A and 350 B are attached to drive shaft 340 .
  • One-way rotational mechanisms 350 A and 350 B are configured to transmit rotation from drive shaft 340 to a first gear train 360 A and a second gear train 360 B, respectively.
  • the other of one-way rotational mechanisms 350 A and 350 B is not engaged, thereby not transmitting rotation from drive shaft 340 to gear trains 360 A and 360 B.
  • one-way rotational mechanisms 350 A and 350 B are configured to engage and transmit rotation from drive shaft 340 to gear trains 360 A and 360 B only when drive shaft 340 is rotating in one direction. When drive shaft 340 is rotating in the opposite direction, one-way rotational mechanisms are then configured to not engage such that no rotation is transmitted from drive shaft 340 to gear trains 360 A and 360 B. More discussion of one-way rotational mechanisms is provided below.
  • One-way rotational mechanism 350 A is disposed about drive shaft 340 and includes a pin 352 A and a biasing mechanism 354 A.
  • drive shaft 340 may include a plurality of teeth 344 A formed therein, in which each tooth 343 A is formed with a stop face 344 A.
  • biasing mechanism 354 A such as a spring (as shown)
  • pin 352 A may be biased towards drive shaft 340 to contact teeth 343 A formed on drive shaft 340 .
  • one-way rotational mechanism 350 A engages and rotates with drive shaft 340 .
  • pin 352 A is biased into contact and engagement with stop face 344 A of teeth 343 A, thereby engaging one-way rotational mechanism 350 A to prevent relative rotation between drive shaft 340 and one-way rotational mechanism 350 A when drive shaft is rotated in direction D 1 .
  • one-way rotational mechanism 350 A does not engage with drive shaft 340 .
  • pin 352 A will preferably slide over teeth 344 A to not rotate with drive shaft 340 , thereby having one-way rotational mechanism 350 A freewheeling about drive shaft 340 .
  • the one-way rotational mechanism is configured to engage when the drive shaft is rotated in one direction, but is configured to not engage when drive shaft is rotated in the other direction.
  • One-way rotational mechanism 350 B may be of similar construction or arrangement as one-way rotational mechanism 350 A; however, those having ordinary skill in the art will appreciate that the invention is not so limited. Further, those having ordinary will appreciate that other one-way rotational mechanisms known in the art may be used with the present invention, such as a one-way clutch or one-way bearings, without departing from the scope of the present invention.
  • one-way rotational mechanisms 350 A and 350 B are attached to drive shaft 340 and oriented in different directions from one another. As such and described above, when drive shaft 340 is rotated in one direction, one of one-way rotational mechanisms 350 A and 350 B is engaged while the other of one-way rotational mechanisms 350 A and 350 B does not engage. Further, when drive shaft 340 is rotated in the other direction, one-way rotational mechanisms 350 A and 350 B reverse roles of engaging and not engaging. These one-way mechanisms 350 A and 350 B may then be attached or configured to engage gear trains 360 A and 360 B. As shown, in this embodiment, one-way mechanisms 350 A and 350 B are attached to spur gears 362 A and 362 B of gear trains 360 A and 360 B, respectively.
  • one-way rotational mechanisms 350 A and 350 B engage drive shaft 340 and rotate, this rotation is transferred from one-way rotating mechanisms 350 A and 350 B to spur gears 362 A and 362 B.
  • spur gears 362 A and 362 B may then be rotatably disposed about drive shaft 340 , but not attached to drive shaft 340 .
  • one-way rotating mechanisms 350 A and 350 B and spur gears 362 A and 362 B may include bearings 344 , such as ball bearings (as shown), roller bearings, or any other similar devices known in the art. Bearings 344 may be used to facilitate the rotation of one-way rotating mechanisms 350 A and 350 B and spur gears 362 A and 362 B when not engaged with drive shaft 340 .
  • gear trains 360 A and 360 B further include additional spur gears 364 A and 364 B and bevel gears 366 A and 366 B.
  • Spur gears 362 A and 362 B are configured to engage additional spur gears 364 A and 364 B through, for example, the engagement of teeth (not shown) formed thereon.
  • additional spur gears 364 A and 364 B include bevel gears 366 A and 366 B attached thereto.
  • spur gears 362 A and 362 B rotate, this rotational motion is translated through additional spur gears 364 A and 364 B to rotate bevel gears 366 A and 366 B.
  • corresponding gear train 360 A and 360 B will also rotate with drive shaft 340 .
  • bevel gears 366 A and 366 B of gear train 360 A and 360 B are configured to engage and rotate hub 310 .
  • bevel gears 366 A and 366 B may engage a bevel gear 311 attached to and/or formed upon hub 310 .
  • bevel gears 366 A and 366 B may rotate bevel gear 311 of hub 310 .
  • Bevel gear 366 B and gear train 360 B may still be engaged with bevel gear 311 of hub 310 during this rotating motion provided by gear train 360 A, but because one-way rotational mechanism 350 A is engaged and providing rotational motion to hub 310 , one-way rotational mechanism 350 B is not engaged, thus not providing any rotational motion to hub 310 .
  • one-way rotational mechanisms 350 A and 350 B are oriented in opposing directions when attached to drive shaft 340 , only one of one-way rotational mechanisms 350 A and 350 B may be engaged to translate the rotational motion from drive shaft 340 along to hub 310 , while the other of one-way rotational mechanisms 350 A and 350 B may then be not engaged, and thereby freewheeling about the drive shaft 340 .
  • hub 310 may always be rotated in the same direction, regardless of the direction of rotation of drive shaft 340 , worm 326 , or motor 318 .
  • the bidirectional rotational motion of drive shaft 340 , worm 326 , and/or motor 318 may be converted to unidirectional rotational motion of hub 310 .
  • the arrangement of drive shaft 340 with one-way rotational mechanisms 350 A and 350 B and gear trains 360 A and 360 B may be such that hub 310 will still always be rotated in only the clockwise direction (i.e., unidirectional rotation).
  • the hub may always continue to rotate in the same direction, independent of the rotational direction of the motor.
  • hub 310 is configured to receive lance 302 and a blowing medium, such as through feed tube 317 .
  • feed tube 317 may pass through hub 310 and into lance 302 , lance 302 threadedly connected to hub 310 , thereby depositing the blowing medium into lance 302 .
  • the blowing medium from feed tube 317 may then flow out nozzles 304 (shown in FIG. 3 ) disposed at the other end of lance 302 .
  • sootblower 300 may include a packing set 367 disposed about feed tube 317 .
  • packing set 367 may include bushings 368 with packing seals 369 disposed therebetween, in which bushings 368 may be pushed together to provide scaling engagement of packing seals 369 about feed tube 317 .
  • hub 310 may further include an inner wall 370 A and an outer wall 370 B with a gap 371 disposed therebetween. Gap 371 , coupled with vents 372 disposed about hub 310 , may be used to provide air cooling of hub 310 . Alternatively, gap 371 may include any other medium known in the art for cooling of hub 310 . Regardless, this arrangement for hub 310 may then be used to more efficiently dissipate heat from hub 310 and/or permit air flow through hub 310 , thereby minimizing heat transfer from feed tube 317 to hub 310 and limiting expansion of any parts. Further, as described above, hub 310 is rotatably disposed within housing 301 .
  • sootblower 300 may include a plurality of roller bearings 373 with protective seals 374 disposed between hub 310 and housing 301 . These roller bearings 373 may then enable hub 310 to rotate with respect to housing 301 while still securing hub 310 within housing 301 .
  • the gear trains that provide the rotational motion from the drive shaft to the hub are provided with varying or different ratios. If the gear trains are provided with ratios to vary or differ from one another, the helical path of the lance being extended into a boiler may then differ from the helical path of the lance being retracted from the boiler. For example, by using multiple gear trains as described above, one gear train may be used to rotate the hub as the lance is being extended into the boiler, and the other gear train may be used to rotate the hub as the lance is being retracted from the boiler.
  • the gear trains may be configured such that the lance may rotate at one rotational speed or ratio (e.g., 20 revolutions per minute or 20 revolutions per foot) when extended into the boiler, and may then rotate at a different rotational speed or ratio when retracted from the boiler (e.g., 15 revolutions per minute or 15 revolutions per foot).
  • one rotational speed or ratio e.g., 20 revolutions per minute or 20 revolutions per foot
  • a different rotational speed or ratio when retracted from the boiler
  • the sootblower includes gear trains that provide rotational motion of different ratios to the hub to produce helical path 880 .
  • the ratio of the rotational motion of the hub when extended into the boiler varies from the ratio of the rotational motion of the hub when retracted from the boiler.
  • the ratio of a first direction of the bidirectional rotational motion of the drive shaft to the unidirectional rotational motion of the hub varies from the ratio of a second direction of the bidirectional rotational motion of the drive shaft to the unidirectional rotational motion of the hub.
  • first extension path 882 when first extended into the boiler, the nozzle of a lance attached to the hub may follow a first extension path 882 . Upon full extension into the boiler then, the nozzle on the lance may then follow a first retraction path 884 . Because taking advantage of the conversion of the bidirectional rotation of the drive shaft to unidirectional rotation of the hub, the orientation of first extension path 882 will oppose the orientation of first retraction path 884 . Specifically, as shown, the orientation of first extension path 882 may be positive with respect to horizontal axis 881 , while the orientation of first retraction path 884 may be negative with respect to horizontal axis 881 .
  • first extension path 882 may differ from the slope of first retraction path 884 .
  • the slope of first extension path 882 may be about sixty degrees with respect to horizontal axis 881
  • the slope of first retraction path 884 may be about forty-five degrees with respect to horizontal axis 881 .
  • the ratio of the gear train rotating the hub as the lance is extended into the boiler is higher than the ratio of the gear train rotating the hub as the lance is retracted from the boiler.
  • the slope of extension paths 882 and 886 is higher than that of retraction paths 884 and 888 .
  • sootblower may incorporate phase-shifts so that upon the next cleaning or trip into the boiler, the nozzle of the sootblower may follow a second extension path 886 and a second retraction path 888 differing from that of first extension path 882 and first retraction path 884 .
  • the present disclosure is not limited to the specific ratios used for the gear trains of the sootblower.
  • the ratio of gear train 360 A may be higher or lower than the ratio of gear train 360 B.
  • the present disclosure is not limited to a specific arrangement of gears within the gear trains of the sootblower.
  • the gear trains may incorporate more gears or fewer gears into the gear assembly, or different sizes of gears, and the numbers and sizes of gears between the gear trains may vary and differ.
  • the hub may be positioned substantially on the vertical centerline of the housing of the sootblower, as hub 310 is positioned substantially on vertical centerline 331 of housing 301 .
  • this enables the majority of the weight from the hub, with the lance and feed tube attached thereto, to be evenly distributed along the drive shaft and amongst the rollers of the sootblower to give the sootblower a balanced design.
  • the hub, the drive shaft, the one-way rotational mechanisms, and the gear trains may be disposed within the housing of the sootblower and submerged in a lubricant.
  • a lubricant of synthetic oil, or any other lubricant known in the art may be disposed and sealed within the housing of the sootblower. This may be used to preserve and maintain the moving parts disposed within the housing of the sootblower.
  • Embodiments of the present disclosure may provide for one or more of the following advantages.
  • First, embodiments disclosed herein may provide a more efficient cleaning of boilers because of the different and varying paths used by the nozzles. Specifically, the nozzle may have an increased amount of paths to follow when cleaning boilers, thereby improving coverage when cleaning.
  • embodiments disclosed herein may provide a more economical sootblower for cleaning of boilers. For example, as shown, the sootblower described herein may only include one motor, thereby preventing cost of an additional motor. Further, embodiments disclosed herein may provide for a sootblower with an increased working life. For example, because the sootblower described herein may incorporate a balanced design, in addition to lubricant disposed therein, the working life of the sootblower may be extended by preventing unnecessary wear of parts.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Incineration Of Waste (AREA)
US11/773,358 2007-03-08 2007-07-03 Varying helical sootblower Abandoned US20080216277A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US11/773,358 US20080216277A1 (en) 2007-03-08 2007-07-03 Varying helical sootblower
PCT/US2008/056412 WO2008109885A1 (fr) 2007-03-08 2008-03-10 Souffleur de suie hélicoïdal variable

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Application Number Priority Date Filing Date Title
US89373807P 2007-03-08 2007-03-08
US11/773,358 US20080216277A1 (en) 2007-03-08 2007-07-03 Varying helical sootblower

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113639275A (zh) * 2021-08-18 2021-11-12 德清旺能环保能源有限公司 一种锅炉蒸汽吹灰装置及使用方法
CN116379415A (zh) * 2023-04-28 2023-07-04 连云港市新港电力辅机有限公司 一种连续排污扩容器

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113639275A (zh) * 2021-08-18 2021-11-12 德清旺能环保能源有限公司 一种锅炉蒸汽吹灰装置及使用方法
CN116379415A (zh) * 2023-04-28 2023-07-04 连云港市新港电力辅机有限公司 一种连续排污扩容器

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