Patent US2757105A successfully refreshed from Google Patents.
US4256511A
Expired / Lapsed
US
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High energy wash of ljungstrom air preheater
Assignee: Hydrochem LLC
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Filing: 1979-09-17
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Granted: 1981-03-17
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Expires: 1999-09-17
Abstract
Abstract The apparatus disclosed herein is designed for removing solid deposits, which interfere with heat transfer, from the surface of the basket section in an air preheater. In one type of regenerative air preheater, the basket sections rotate around a hub inside a chamber. An I-beam and threaded rod are installed in the chamber parallel to the basket section, at a distance sufficient to allow clearance of the carriage assembly and jet nozzle, or nozzles. The carriage assembly is attached to the rod by a threaded drive block and the carriage straddles the I-beam. A motor drive, which is controlled by an electronic programmer, rotates the threaded rod, to drive the carriage incrementally along the rod and beam. The carriage also includs roller type bearings which aid movement of the carriage along the beam. As the basket section rotates parallel to the moving carriage, a high pressure water jet, or jets, is directed through the nozzle to wash the solid deposits off of the basket section. The high energy jet stream achieves complete removal from the basket section of all deposits which can impede gas flow and limit heat transfer.
Inventors
- 👤 Hugh C. Atchison
- 👤 Bobby G. Simmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:37
CPC Classifications
F; F28; F28G; F28G9/00; F28G9/005
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
473 words
An apparatus for cleaning the basket section of an air preheater, the basket section being enclosed within a chamber and rotatable around a hub positioned in the chamber, the apparatus comprising; an elongate beam spaced from and parallel to the basket section, the beam having an inner end secured to the hub and an outer end secured to the inside wall surface of the chamber; an elongate threaded rod spaced from and parallel to the beam, the rod having an inner end mounted in a rotatable bearing member secured to the hub, the rod having an outer end which extends beyond the chamber wall, and the rod being carried near the outer end in a rotatable bearing member secured to the inside wall surface of the chamber; a drive unit mounted outside of the chamber, and the drive unit engaging the outer end of the threaded rod, such that the rod can be rotated by the drive unit; a carriage assembly which straddles the threaded rod and the beam, the carriage assembly including at least one carriage drive block, the drive block being secured to the carriage assembly and having a central threaded opening therein which engages the threaded rod, to thereby enable the carriage assembly to move along the threaded rod as the rod rotates; the carriage assembly further including top roller means mounted on the carriage assembly and engaging the top face of the beam, and bottom roller means mounted on the carriage assembly and engaging the bottom face of the beam, said roller means enabling the carriage assembly to be moved along the beam; a nozzle assembly which includes a head block fastened onto the carriage assembly between the bottom roller means and the basket section, a fluid passage inside the head block, a jet nozzle installed in the head block and in communication with the fluid passage and at least one inlet line which connects the fluid passage with a source of washing fluid; an automatic programmer unit which includes a means for actuating the drive unit, a first counter means associated with the basket section, and a second counter means associated with the drive unit actuating means and with the threaded rod; wherein the washing fluid is directed through the inlet line and jet nozzle and onto the basket section, to thereby remove solid deposits from the basket section; the first counter means is adapted to register one complete revolution of the rotating basket secton and to actuate the second counter means after registering each complete revolution of the basket section; and the second counter means is adapted to actuate the drive unit actuating means, to cause the threaded rod to rotate a set number of revolutions, as registered by the second counter means, and to thereby advance the carriage assembly a predetermined distance along the threaded rod.
Claim 2
Independent Claim
473 words
An apparatus for cleaning the basket section of an air preheater, the basket section being enclosed within a chamber and rotatable around a hub positioned in the chamber, the apparatus comprising; an elongate beam spaced from and parallel to the basket section, the beam having an inner end secured to the hub and an outer end secured to the inside wall surface of the chamber; an elongate threaded rod spaced from and parallel to the beam, the rod having an inner end mounted in a rotatable bearing member secured to the hub, the rod having an outer end which extends beyond the chamber wall, and the rod being carried near the outer end in a rotatable bearing member secured to the inside wall surface of the chamber; a drive unit mounted outside of the chamber, and the drive unit engaging the outer end of the threaded rod, such that the rod can be rotated by the drive unit; a carriage assembly which straddles the threaded rod and the beam, the carriage assembly including at least one carriage drive block, the drive block being secured to the carriage assembly and having a central threaded opening therein which engages the threaded rod, to thereby enable the carriage assembly to move along the threaded rod as the rod rotates; the carriage assembly further including top roller means mounted on the carriage assembly and engaging the top face of the beam, and bottom roller means mounted on the carriage assembly and engaging the bottom face of the beam, said roller means enabling the carriage assembly to be moved along the beam; a nozzle assembly which includes a head block fastened onto the carriage assembly between the bottom roller means and the basket section, a fluid passage inside the head block, a jet nozzle installed in the head block and in communication with the fluid passage and at least one inlet line which connects the fluid passage with a source of washing fluid; an automatic programmer unit which includes a means for actuating the drive unit, a first counter means associated with the basket section, and a second counter means associated with the drive unit actuating means and with the threaded rod; wherein the washing fluid is directed through the inlet line and jet nozzle and onto the basket section, to thereby remove solid deposits from the basket section; the first counter means is adapted to register one complete revolution of the rotating basket secton and to actuate the second counter means after registering each complete revolution of the basket section; and the second counter means is adapted to actuate the drive unit actuating means, to cause the threaded rod to rotate a set number of revolutions, as registered by the second counter means, and to thereby advance the carriage assembly a predetermined distance along the threaded rod.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1 in which the basket section is horizontally positioned.
Claim 4
Dependent Claim
13 words
The apparatus of claim 1 in which the basket section is vertically positioned.
Claim 5
Dependent Claim
57 words
The apparatus of claim 1 in which the automatic programmer further includes a third counter means associated with the second counter means and the threaded rod, and which is adapted to register each complete revolution of the threaded rod, to enable the programmer unit to determine the exact position of the carriage assembly on the threaded rod.
Claim 6
Dependent Claim
45 words
The apparatus of claim 1 in which the carriage assembly further includes a carriage support block, the block being secured to the carriage assembly adjacent to the carriage drive block, the support block having a lengthwise central opening therein which fits around the threaded rod.
Claim 7
Dependent Claim
34 words
The apparatus of claim 5 in which the carriage support block is split lengthwise, to define a block which has an upper section and lower section, each section being secured to the carriage assembly.
Claim 8
Dependent Claim
34 words
The apparatus of claim 1 in which the carriage drive block is split lengthwise, to define a block having an upper section and a lower section, each section being secured to the carriage assembly.
Claim 9
Dependent Claim
35 words
The apparatus of claim 1 in which the drive unit is defined by an air motor and a gear means mounted on the outer end of the threaded rod and engageable with the air motor.
Claim 10
Dependent Claim
45 words
The apparatus of claim 8 in which the drive unit actuating means is defined by an air supply header and a solenoid operated valve, the header being connected into the air motor, and the valve being connected into the automatic programmer unit and the header.
Claim 11
Dependent Claim
15 words
The apparatus of claim 1 in which the hub is positioned centrally in the chamber.
Claim 12
Dependent Claim
12 words
The apparatus of claim 1 in which the beam is an I-beam.
Claim 13
Dependent Claim
26 words
The apparatus of claim 1 which further includes at least two inlet lines, each line connecting the fluid passage into a source of a washing fluid.
Claim 14
Dependent Claim
15 words
The apparatus of claim 1 in which the washing fluid is an aqueous washing fluid.
Claim 15
Dependent Claim
36 words
The apparatus of claim 1 in which the top and bottom roller means are each defined by a pair of roller pins, the pins in each pair being mounted on the carriage assembly in adjacent relation.
Claim 16
Dependent Claim
29 words
The apparatus of claim 1 which is adapted for directing a washing fluid through the jet nozzle at high pressure to clean the basket section of the air preheater.
Claim 17
Dependent Claim
20 words
The apparatus of claim 15 in which the washing fluid pressure is from about 2000 psig to about 10,000 psig.
Claim 18
Dependent Claim
20 words
The apparatus of claim 16 in which the washing fluid pressure is from about 4000 psig to about 10,000 psig.
Claim 19
Independent Claim
438 words
An apparatus for cleaning the basket section of an air preheater, the basket section being enclosed within a chamber and positioned around a hub positioned in the chamber, the apparatus comprising: an elongate beam spaced from and parallel to the basket section, the inner end of said beam being secured to a rotatable collar around the hub; an elongate threaded rod spaced from and parallel to the beam, the rod having an inner end mounted in a rotatable bearing member secured to said rotatable collar, and the rod having an outer end which extends beyond the chamber wall; a drive unit mounted outside of the chamber, which engages the outer end of the threaded rod, such that the rod can be rotated by the drive unit; a carriage assembly which straddles the threaded rod and the beam, the carriage assembly including at least one carriage drive block, the drive block being secured to the carriage assembly and having a central threaded opening therein which engages the threaded rod, to thereby enable the carriage assembly to move along the threaded rod as the rod rotates; the carriage assembly further including top roller means mounted on the carriage assembly and engaging the top face of the beam, and bottom roller means mounted on the carriage assembly and engaging the bottom face of the beam, said roller means enabling the carriage assembly to be moved along the beam; a nozzle assembly which includes a head block fastened onto the carriage assembly between the bottom roller means and the basket section, a fluid passage inside the head block, a jet nozzle installed in the head block and in communication with the fluid passage and at least one inlet line which connects the fluid passage with a source of washing fluid; an automatic programmer unit which includes a means for actuating the drive unit, a first counter means associated with the rotatable collar, and a second counter means associated with the drive unit actuating means and with the threaded rod; wherein the washing fluid is directed through the inlet line and jet nozzle and onto the basket section, to thereby remove solid deposits from the basket section; the first counter means is adapted to register one complete revolution of the rotatable collar around the hub, and to actuate the second counter means after registering each complete revolution; and the second counter means is adapted to actuate the drive unit actuating means, to cause the threaded rod to rotate a set number of revolutions, as registered by the second counter means, and thereby advance the carriage assembly a predetermined distance along the threaded end.
Claim 20
Independent Claim
438 words
An apparatus for cleaning the basket section of an air preheater, the basket section being enclosed within a chamber and positioned around a hub positioned in the chamber, the apparatus comprising: an elongate beam spaced from and parallel to the basket section, the inner end of said beam being secured to a rotatable collar around the hub; an elongate threaded rod spaced from and parallel to the beam, the rod having an inner end mounted in a rotatable bearing member secured to said rotatable collar, and the rod having an outer end which extends beyond the chamber wall; a drive unit mounted outside of the chamber, which engages the outer end of the threaded rod, such that the rod can be rotated by the drive unit; a carriage assembly which straddles the threaded rod and the beam, the carriage assembly including at least one carriage drive block, the drive block being secured to the carriage assembly and having a central threaded opening therein which engages the threaded rod, to thereby enable the carriage assembly to move along the threaded rod as the rod rotates; the carriage assembly further including top roller means mounted on the carriage assembly and engaging the top face of the beam, and bottom roller means mounted on the carriage assembly and engaging the bottom face of the beam, said roller means enabling the carriage assembly to be moved along the beam; a nozzle assembly which includes a head block fastened onto the carriage assembly between the bottom roller means and the basket section, a fluid passage inside the head block, a jet nozzle installed in the head block and in communication with the fluid passage and at least one inlet line which connects the fluid passage with a source of washing fluid; an automatic programmer unit which includes a means for actuating the drive unit, a first counter means associated with the rotatable collar, and a second counter means associated with the drive unit actuating means and with the threaded rod; wherein the washing fluid is directed through the inlet line and jet nozzle and onto the basket section, to thereby remove solid deposits from the basket section; the first counter means is adapted to register one complete revolution of the rotatable collar around the hub, and to actuate the second counter means after registering each complete revolution; and the second counter means is adapted to actuate the drive unit actuating means, to cause the threaded rod to rotate a set number of revolutions, as registered by the second counter means, and thereby advance the carriage assembly a predetermined distance along the threaded end.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |