CA1242186A - Air recuperator cleaner - Google Patents
Air recuperator cleanerInfo
- Publication number
- CA1242186A CA1242186A CA000482479A CA482479A CA1242186A CA 1242186 A CA1242186 A CA 1242186A CA 000482479 A CA000482479 A CA 000482479A CA 482479 A CA482479 A CA 482479A CA 1242186 A CA1242186 A CA 1242186A
- Authority
- CA
- Canada
- Prior art keywords
- transport gas
- tube
- tubes
- particle
- flow
- 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
Links
Abstract
ABSTRACT OF THE DISCLOSURE
A method and apparatus for interrupting the flow of carbon black particle-carrying transport gas passing through recuperator tubes for a short period of time to cause the carbon black material accumulating and adhering to the inner walls of the tube to be removed therefrom and swept from the tube by the resumption of transporter gas flow.
A method and apparatus for interrupting the flow of carbon black particle-carrying transport gas passing through recuperator tubes for a short period of time to cause the carbon black material accumulating and adhering to the inner walls of the tube to be removed therefrom and swept from the tube by the resumption of transporter gas flow.
Description
***********************
AIR RECUPERATOR C~EANE~
***********************
BACKGROUND OF THE INVENTION
This invention relates in general to a method and apparatus for cleaning air recuperators and, in particular, to an on-line method and apparatus for air recuperator cleaning.
More specifically, but ~"ithout restriction to the particular use which is shown and described, this invention relates to a method and apparatus for on-line cleaning of finely-divided carbon black p`owder deposits from gas-to-gas tube and shell recuperators.
In the production of carbon black or other highly dispersed, high-surface activity solids formed by pyrogellic processes, the solids are transported by a gas stream for ultimate deposition in flexible tube filters or similar dcvices.
Before depositing the solids material on or in such filters, it is desirable -to remove the heat from the transporting was for reuse in the system. Therefore, the heat from such trans-port gas is generally removed by heat exchangers which include bundles of tubes through which -the transport gas and carton black solids material is passing. As the carbon black is carried through the tubes by the transport gas, deposits of carbon black particles form on the internal walls of the tubes. Thesc dcposits reduce both the flow of the transport gas through the tubs, and the efficient transfer of heat from the gas. In particularly aggravated situations, a complete blockage of an individual tube can occur which may lead to damage of the heat exchanger.
Since -the ends of the tube are secured in a tube sheet, a tube in which the carbon build-up has caused a blockage becomes cooler than the adjacent tubes through which the hot transport gas is being passed. As a result, the cooler tube produces contraction stresses on the tube sheet which can tear the blocked tube free from its moun-ting in the tube sheet.
In an attempt to resolve this problem, some heat exchangers are designed such that the decrease in heat transfer efficiency is attempted Jo be compensated for by increasing the heat exchange surface area thereby oversizing the apparatus for the needs of the process. However, such oversizing is a temporary solution to the problem. As the unit is in service, deposits and subsequent fouling will eventually occur, decreasing the system efficiency and resulting in a decrease below process requirements.
Various methods and apparatus have been utilized to clean carbon black deposits :from the tube interiors such as chemical treatment with or without mechanical scrubbing. How-ever, chemical me-thods require that -the unit be taken o~f-line and out of production, as well as requiring expert handling of the chemicals to prevent damage to the metal parts of the heat exchanger. The varlous mechanical cleaning methods wh:ich llave been utilized require a large amount of manual labor, sigh as by forcing a long worm or wire brush through each tubc, or sandblasting.
Accordingl~V, different attempts have been made to prevent such excessive build-up by utilizing cleaning jut nozzles such as disclosed in U.S. Pa-tents Nos. 2,069,57~;
3,364,~83; 4,141,754; and 4,366,003. Each of the systems disclosed in these patents utilizes a discharge of high pressure air from jet nozzles positioned over an inlet opening to the tube in order to provide a short burst oE
a cleaning gas into the processing tubes. While such systems may be somewhat satisfactory, they increase the mechanical complexity of the overall system, and necessitate added controls and maintenance costs.
SUMMARY OF THE INVENTION
It is, therefore, an object of this invention to improve the method and apparatus for cleaning air recuperators by removing built-up carbon deposits from the inner surfaces of a transporter tube through which the carbon black particles are transpor-ted when extracting heat from the transport was.
Another object of thls invention is to prevent excessive build-up or blockage of the transport tube due to the accumulation of finely--dispersed, high surface activity solids transported in -the gas s-tream through the transport tubes.
A further object of this invention is to prevcnt excessive build-up of carbon black. particles on the intcrior walls of a heat exchange transpor-ter tube through an on-line system which does not require that the heat exchanger ye taken off-line in order to prevent such excessive build-up.
Still another object of this invention is to clean finely-divided inorganic powder deposits from gas-to-gas tube and shell recuperators without interrupting the operation of the heat exchanger or utilizing chemical cleaning processes or expensive, maintenance-requiring mechanical cleaning systems.
These and other objects are attained in accordance with the present invention wherein there is provided a method and apparatus for interrupting the flow of carbon black particle-carrying transport gas passing through recuperator tubes for a short period of -time to cause the carbon hlack material accumulating and adhering to the inner walls of the tube to be removed therefrorn and swept from the tube by the resumption of transporter gas flow.
ESCRIPTION OF THE DRAWINGS
Further objects of the inven-tion together with additional features contributing thereto and advantages accruing therefrom will be apparent from the following description of a preferred embodiment of the invention which is shown in the accompanying drawings with like reference numera].s indicating corresponding parts -throu~]h-out, wherein;
FIG. 1 is a fron-tal perspective view of a gas to-gas shell and tube recuperator apparatus utilizing the invention;
FIG. 2 is a horizontal planar view of the top of recuperator apparatus such as illustrated in FIG. 1 with portions broken away to illustrate components of the invention;
` FIG. 3 is a partial sectional view of the apparatus shown in FIG. 2 taken along lines 3--3;
FIG. is a par-tial sec-tional view of the apparatus shown in FIG. 2 taken along lines 4-~;
FIG. 5 is a horizon-tal p]anar view of a portion of the apparatus of the invention;
FIG. 6 is a horizontal planar view of a por-tion of the invention to better illustrate the components thereof;
FIG. 7 is a cross-sectional view of -the structure shown in FIG. 6 -taken along lines 7-7; and FIG. 8 is an enlarged illustration of a portion of the invention to bet-ter illustrate the details thereof.
DESCRIPTION OF A PREFERRED EMBODIMENT
Referring now to FIG. 1, there is illustrated a gas-to-gas shell and tube recuperator 100 having a plurality of individual recuperator tubes 10 secured in a tube sheet 12 and through which a carbon black particle carrying transport gas is passed. The tubes 10 are enclosed by a shell 20 into which a heat exchanging medium or transfer gas is introduced through an inlet 21 to remove and transfer the heat from the trc~l~sport gas for further use. The heat transfer gas passes within the shell 20 and out through a discharge outlet, not shown, to remove heat from the transfer gas passing through the tubes 10.
As previously discussed, during the transport of the carbon black particles through the tubes 10, the interior surface of the tubes accumulates carbon black particles.
This ac`cumulation interferes with the efficient transfer of heat from the transport gas to the heat transfer medium being circulated through the recuperator shell 20, and may even-tually clog the tube interior which can result in a tube 10 pulling loose from the tube sheet 12 in which it is secured. There-fore, a shutter or flow interrupter assembly 50 is positioned adjacent to a discharge end 11 of the tubes 10, to provide a system for removing the carbon black build-up within the tube interior.
The shutter assembly 50 includes a shutter or slide plate 51 formed in three sections 51A, 51B, and 51C, all three of which function in the same manner and, except for the diff-erences in shape, are structurally the same. Therefore, for c'onvenience of illus-tration, these shutter plates will be referred to by the general reference numeral 51.
s shown in FIG. 2, the shutter plates 51 are supported adjacent the discharge end 11 of -the recuperator tubes 10 and are formed with a series of holes or apertures 52 corres-pending in number and size to the adjacent discharge opening 11 of the tubes 10. In this manner the carbon black particle-carrying transport gas will pass through the holes 52 wormed in the shutter pla-te 51 for further processing. The skitter or slide plate 51, shown in planar view in FIG. 5, also has a plurality of guide slots 53 formed longitudinally in the shutter plate 51 between adjacent rows of apertures 52 to assist in guiding the sliding movement of the shutter plate.
Each of the shutter or slide plates 51 is secured at one end to a push rod 60 which is appropriately journaled 61 in a flange portion 22 of the recuperator shell 20 to permit sliding movement of the shutter plate 51 in a direc-tion transverse to the longitudinal axis of the recuperator tubes 10.
The length of travel of the push rod 60 and the length of the guide slots 53 can function to limit the sliding plate move-Kent. The push rod 60 may be spring-loaded to return to an initial, unbiased position wherein the apertures 52 formed in the slide or shutter plate 51 are coaxially aligned with the discharge opening 11 of the recuperator tubes 10 and out of interference with the flow of carbon black particle-carrying transport gas. In addition,~the pins 60 may be connected to a suitable apparatus, not shown, which will impart a quick sliding movement to the shutter plates 51 to move the plate into and out from interference with the flow of the transport gas through the recuperator tubes 10 as desired.
As best shown in FIGS. 3-8, the shutter plate 51 is supported adjacent to, or in sliding contact with, the discharge end 11 of the recuperator tubes 10 such that the pl.ate ma slide into a position to block the dissha.rge end 11 of the recuperator tubes 10. Support plates 55 are cut to conform to the outer peripheral surface of the recuperator tubes 10, and are welded near the discharge end 11 khereof Oll-t of interEerence with the flow of the transport gas therethrough. plurcllity of vertically extendiny guide pins 56 are welded to the face of the - lZ~2186 support plates 55. The guide pins 56 extend outwardly a distance sufficient to pass through the guide slots 53 of the shutter plate 51. Upon positioning of the shutter plate with the guide pins 56 extending through the guide slots formed therein, a corresponding plurality of washers 57 are tack--welded to the protruding end of the guide pins 56 to hold the slide or shutter plates 51 in proper alignment when moved transversely into and out from blocking the flow of the transport gas through the recuperator tubes 10. In this manner, the transverse sliding movement of the shutter plates 51 into and out from blocking the discharge from the recuperator tubes 10 will be guided and controlled.
The movement of the slide or shutter plates 51 across the discharge ends 11 of the recuperator tubes 10 is preferably done very quickly, and suddenly, for a short time period such as on the order of one-second duration. The more sudden and complete the blockage of the discharge end 11 of the tubes, the Gore beneficial the effect in dislodging the carbon particle build-up from the tube interior. The frequency of blocking the transport gas flow in order to maintain acceptable recup-erator performance varies with the type of finely-divided powder being produced, but is believed to generally range from one to sixty cycles per hour. While it is not known with certainty as to what causes this dislodgement, it is believed that the coating dislodgement occurs through three basic mechanisms:
1. A water hammer effect and concomitant pressure wave which travels down the tube causing rapid compression and expansion of the transport gas in the recuperator tube, thus mechanically breaking or dislodging some of the carbon deposits By from the tube interior.
AIR RECUPERATOR C~EANE~
***********************
BACKGROUND OF THE INVENTION
This invention relates in general to a method and apparatus for cleaning air recuperators and, in particular, to an on-line method and apparatus for air recuperator cleaning.
More specifically, but ~"ithout restriction to the particular use which is shown and described, this invention relates to a method and apparatus for on-line cleaning of finely-divided carbon black p`owder deposits from gas-to-gas tube and shell recuperators.
In the production of carbon black or other highly dispersed, high-surface activity solids formed by pyrogellic processes, the solids are transported by a gas stream for ultimate deposition in flexible tube filters or similar dcvices.
Before depositing the solids material on or in such filters, it is desirable -to remove the heat from the transporting was for reuse in the system. Therefore, the heat from such trans-port gas is generally removed by heat exchangers which include bundles of tubes through which -the transport gas and carton black solids material is passing. As the carbon black is carried through the tubes by the transport gas, deposits of carbon black particles form on the internal walls of the tubes. Thesc dcposits reduce both the flow of the transport gas through the tubs, and the efficient transfer of heat from the gas. In particularly aggravated situations, a complete blockage of an individual tube can occur which may lead to damage of the heat exchanger.
Since -the ends of the tube are secured in a tube sheet, a tube in which the carbon build-up has caused a blockage becomes cooler than the adjacent tubes through which the hot transport gas is being passed. As a result, the cooler tube produces contraction stresses on the tube sheet which can tear the blocked tube free from its moun-ting in the tube sheet.
In an attempt to resolve this problem, some heat exchangers are designed such that the decrease in heat transfer efficiency is attempted Jo be compensated for by increasing the heat exchange surface area thereby oversizing the apparatus for the needs of the process. However, such oversizing is a temporary solution to the problem. As the unit is in service, deposits and subsequent fouling will eventually occur, decreasing the system efficiency and resulting in a decrease below process requirements.
Various methods and apparatus have been utilized to clean carbon black deposits :from the tube interiors such as chemical treatment with or without mechanical scrubbing. How-ever, chemical me-thods require that -the unit be taken o~f-line and out of production, as well as requiring expert handling of the chemicals to prevent damage to the metal parts of the heat exchanger. The varlous mechanical cleaning methods wh:ich llave been utilized require a large amount of manual labor, sigh as by forcing a long worm or wire brush through each tubc, or sandblasting.
Accordingl~V, different attempts have been made to prevent such excessive build-up by utilizing cleaning jut nozzles such as disclosed in U.S. Pa-tents Nos. 2,069,57~;
3,364,~83; 4,141,754; and 4,366,003. Each of the systems disclosed in these patents utilizes a discharge of high pressure air from jet nozzles positioned over an inlet opening to the tube in order to provide a short burst oE
a cleaning gas into the processing tubes. While such systems may be somewhat satisfactory, they increase the mechanical complexity of the overall system, and necessitate added controls and maintenance costs.
SUMMARY OF THE INVENTION
It is, therefore, an object of this invention to improve the method and apparatus for cleaning air recuperators by removing built-up carbon deposits from the inner surfaces of a transporter tube through which the carbon black particles are transpor-ted when extracting heat from the transport was.
Another object of thls invention is to prevent excessive build-up or blockage of the transport tube due to the accumulation of finely--dispersed, high surface activity solids transported in -the gas s-tream through the transport tubes.
A further object of this invention is to prevcnt excessive build-up of carbon black. particles on the intcrior walls of a heat exchange transpor-ter tube through an on-line system which does not require that the heat exchanger ye taken off-line in order to prevent such excessive build-up.
Still another object of this invention is to clean finely-divided inorganic powder deposits from gas-to-gas tube and shell recuperators without interrupting the operation of the heat exchanger or utilizing chemical cleaning processes or expensive, maintenance-requiring mechanical cleaning systems.
These and other objects are attained in accordance with the present invention wherein there is provided a method and apparatus for interrupting the flow of carbon black particle-carrying transport gas passing through recuperator tubes for a short period of -time to cause the carbon hlack material accumulating and adhering to the inner walls of the tube to be removed therefrorn and swept from the tube by the resumption of transporter gas flow.
ESCRIPTION OF THE DRAWINGS
Further objects of the inven-tion together with additional features contributing thereto and advantages accruing therefrom will be apparent from the following description of a preferred embodiment of the invention which is shown in the accompanying drawings with like reference numera].s indicating corresponding parts -throu~]h-out, wherein;
FIG. 1 is a fron-tal perspective view of a gas to-gas shell and tube recuperator apparatus utilizing the invention;
FIG. 2 is a horizontal planar view of the top of recuperator apparatus such as illustrated in FIG. 1 with portions broken away to illustrate components of the invention;
` FIG. 3 is a partial sectional view of the apparatus shown in FIG. 2 taken along lines 3--3;
FIG. is a par-tial sec-tional view of the apparatus shown in FIG. 2 taken along lines 4-~;
FIG. 5 is a horizon-tal p]anar view of a portion of the apparatus of the invention;
FIG. 6 is a horizontal planar view of a por-tion of the invention to better illustrate the components thereof;
FIG. 7 is a cross-sectional view of -the structure shown in FIG. 6 -taken along lines 7-7; and FIG. 8 is an enlarged illustration of a portion of the invention to bet-ter illustrate the details thereof.
DESCRIPTION OF A PREFERRED EMBODIMENT
Referring now to FIG. 1, there is illustrated a gas-to-gas shell and tube recuperator 100 having a plurality of individual recuperator tubes 10 secured in a tube sheet 12 and through which a carbon black particle carrying transport gas is passed. The tubes 10 are enclosed by a shell 20 into which a heat exchanging medium or transfer gas is introduced through an inlet 21 to remove and transfer the heat from the trc~l~sport gas for further use. The heat transfer gas passes within the shell 20 and out through a discharge outlet, not shown, to remove heat from the transfer gas passing through the tubes 10.
As previously discussed, during the transport of the carbon black particles through the tubes 10, the interior surface of the tubes accumulates carbon black particles.
This ac`cumulation interferes with the efficient transfer of heat from the transport gas to the heat transfer medium being circulated through the recuperator shell 20, and may even-tually clog the tube interior which can result in a tube 10 pulling loose from the tube sheet 12 in which it is secured. There-fore, a shutter or flow interrupter assembly 50 is positioned adjacent to a discharge end 11 of the tubes 10, to provide a system for removing the carbon black build-up within the tube interior.
The shutter assembly 50 includes a shutter or slide plate 51 formed in three sections 51A, 51B, and 51C, all three of which function in the same manner and, except for the diff-erences in shape, are structurally the same. Therefore, for c'onvenience of illus-tration, these shutter plates will be referred to by the general reference numeral 51.
s shown in FIG. 2, the shutter plates 51 are supported adjacent the discharge end 11 of -the recuperator tubes 10 and are formed with a series of holes or apertures 52 corres-pending in number and size to the adjacent discharge opening 11 of the tubes 10. In this manner the carbon black particle-carrying transport gas will pass through the holes 52 wormed in the shutter pla-te 51 for further processing. The skitter or slide plate 51, shown in planar view in FIG. 5, also has a plurality of guide slots 53 formed longitudinally in the shutter plate 51 between adjacent rows of apertures 52 to assist in guiding the sliding movement of the shutter plate.
Each of the shutter or slide plates 51 is secured at one end to a push rod 60 which is appropriately journaled 61 in a flange portion 22 of the recuperator shell 20 to permit sliding movement of the shutter plate 51 in a direc-tion transverse to the longitudinal axis of the recuperator tubes 10.
The length of travel of the push rod 60 and the length of the guide slots 53 can function to limit the sliding plate move-Kent. The push rod 60 may be spring-loaded to return to an initial, unbiased position wherein the apertures 52 formed in the slide or shutter plate 51 are coaxially aligned with the discharge opening 11 of the recuperator tubes 10 and out of interference with the flow of carbon black particle-carrying transport gas. In addition,~the pins 60 may be connected to a suitable apparatus, not shown, which will impart a quick sliding movement to the shutter plates 51 to move the plate into and out from interference with the flow of the transport gas through the recuperator tubes 10 as desired.
As best shown in FIGS. 3-8, the shutter plate 51 is supported adjacent to, or in sliding contact with, the discharge end 11 of the recuperator tubes 10 such that the pl.ate ma slide into a position to block the dissha.rge end 11 of the recuperator tubes 10. Support plates 55 are cut to conform to the outer peripheral surface of the recuperator tubes 10, and are welded near the discharge end 11 khereof Oll-t of interEerence with the flow of the transport gas therethrough. plurcllity of vertically extendiny guide pins 56 are welded to the face of the - lZ~2186 support plates 55. The guide pins 56 extend outwardly a distance sufficient to pass through the guide slots 53 of the shutter plate 51. Upon positioning of the shutter plate with the guide pins 56 extending through the guide slots formed therein, a corresponding plurality of washers 57 are tack--welded to the protruding end of the guide pins 56 to hold the slide or shutter plates 51 in proper alignment when moved transversely into and out from blocking the flow of the transport gas through the recuperator tubes 10. In this manner, the transverse sliding movement of the shutter plates 51 into and out from blocking the discharge from the recuperator tubes 10 will be guided and controlled.
The movement of the slide or shutter plates 51 across the discharge ends 11 of the recuperator tubes 10 is preferably done very quickly, and suddenly, for a short time period such as on the order of one-second duration. The more sudden and complete the blockage of the discharge end 11 of the tubes, the Gore beneficial the effect in dislodging the carbon particle build-up from the tube interior. The frequency of blocking the transport gas flow in order to maintain acceptable recup-erator performance varies with the type of finely-divided powder being produced, but is believed to generally range from one to sixty cycles per hour. While it is not known with certainty as to what causes this dislodgement, it is believed that the coating dislodgement occurs through three basic mechanisms:
1. A water hammer effect and concomitant pressure wave which travels down the tube causing rapid compression and expansion of the transport gas in the recuperator tube, thus mechanically breaking or dislodging some of the carbon deposits By from the tube interior.
2. The sudden blockage of the tube results in the recuperator tube cooling for a fraction of a second, such that the resultant differential expansion of the processing tube and the internal carbon black particle coatinc3 weakcns the binding of the carbon black particles to the tube intcrior.
3. The sudden stoppage of the -transport gas flow results in the cessation of an electric curren-t being generated by movement of the finely-divided particles carried in the -transport gas stream. This electrostatic charge which is generated by this movement is imparted -to the individual carbon black particles eausing them -to adhere to the interior wall ox the tubes. Interruption of the flow of the transport gas permits this electrostatic charge to be dissipated througil the metal walls of the tubes at a rate faster than the eharc3e is being accumulated, thus reducing or eliminating some of the electrostatie attraetive forces which are believed to create, in part, the accumulation of the carbon black particles.
While the invention has been described in the speci-fication and illustrated in the drawings with reference to apreferred embodiment, it will be understood by those skillcd in the art that various changes may be made and equivalen-ts may be substitued for elements thereof without departing from thc scope of the invention. In addition, many modifications may be made to adapt a particular situa-tion or material to the tcac}linc~s of the invention without departing from the essential scope thereof.
Therefore, it is intended -that the invention not be limitL~d to the particular embodiment illustrated by -the drawings alld clescriL~cd ~2~
in the specification as the best mode presently contemplated for carrying out this invention, bu-t that the invention will include any embodiments falling within the scope of the appended claims.
While the invention has been described in the speci-fication and illustrated in the drawings with reference to apreferred embodiment, it will be understood by those skillcd in the art that various changes may be made and equivalen-ts may be substitued for elements thereof without departing from thc scope of the invention. In addition, many modifications may be made to adapt a particular situa-tion or material to the tcac}linc~s of the invention without departing from the essential scope thereof.
Therefore, it is intended -that the invention not be limitL~d to the particular embodiment illustrated by -the drawings alld clescriL~cd ~2~
in the specification as the best mode presently contemplated for carrying out this invention, bu-t that the invention will include any embodiments falling within the scope of the appended claims.
Claims (11)
1. In an air recuperator having a plurality of individual recuperator tubes supported at a discharge outlet by a tube sheet and carried within a shell through which a heat transfer medium is passed in thermal contact with the exterior surface of the recuperator tubes to transfer heat from a finely-divided particle-bearing transport gas passing through the recuperator tubes to the heat transfer medium, and wherein the finely-divided particles adhere to the interior surface of the recuperator tubes, the improvement comprising a shutter plate having a plurality of apertures formed therein and positioned adjacent to the discharge out-let end of the plurality of individual recuperator tubes, with each such discharge outlet end aligned with one of said plurality of apertures permitting the uninterrupted flow of the particle-bearing transport gas therethrough, and means for abruptly sliding said shutter plate across the discharge outlet end of said plurality of individual re-cuperator tubes to block each such discharge outlet end for loosening the finely-divided particles adhering to the interior surface of the recuperator tubes.
2. The apparatus of Claim 1 wherein said shutter plate includes a plurality of guide slots formed therein for controlling the sliding movement thereof.
3. The apparatus of Claim 2 further including a plurality of guide pins supported from the recuperator tubes and positioned to engage said slots formed in said support plate.
4. The apparatus of Claim 3 wherein said shutter plate is in contact with the discharge outlet of the recup-erator tubes.
5. An apparatus for removing accumulations of finely-divided particles deposited on the interior surface of heat exchanger tubes through which a transport gas bearing such particles is passed, comprising a shutter plate having a plurality of apertures formed therein corresponding to the number of heat exchanger tubes through which a finely-divided particle-bearing transport gas is passed to enable the transport gas and particles to pass through said apertures, said shutter plate being positionable adjacent a downstream end of the heat exchanger tubes with said plurality of apertures aligned with the downstream end of the heat exchanger tubes to pass the particle-bearing transport gas therethrough, cut-off means for guiding the movement of said shutter plate into and out from a position blocking the flow of the particle-bearing transport gas through the tubes.
6. The apparatus of Claim 5 wherein said shutter plate is positioned in contact with the discharge end of a plurality of heat exchanger tubes.
7. The apparatus of Claim 6 further including a plurality of support plates to be supported adjacent the discharge end of the plurality of heat exchanger tubes, said support plates including a plurality of vertically-extending guide pins for engaging said shutter plate to guide the movement thereof into and out from blocking the flow of the particle-bearing transport gas.
8. The apparatus of Claim 7 further including retaining means secured to an end of said guide pins for maintaining said shutter plate position adjacent to the plurality of heat exchanger tubes.
9. A method of removing accumulated deposits of finely-divided solids particles adhering to the interior surface of a tube-through which the particles are carried in a transport gas, comprising the steps of passing a finely-divided particle-bearing transport gas through a tube in which the particles adhere to the interior surface thereof, and periodically blocking and then resuming the flow of the particle-bearing transport gas at a downstream discharge end of the tube creating a pressure wave therein to loosen the solids particle accumulation upon interrupting the flow of transport gas from the discharge end of the tube and removing the loosened solids particle accumulation upon resuming the flow of transport gas through the tube.
10. A method of removing accumulated deposits of finely-divided solids particles adhering to the interior surface of a tube through which the particles are carried in a transport gas, comprising the steps of passing a finely-divided particle-bearing transport gas through a tube in which the particles adhere to the interior surface thereof, and periodically blocking and then resuming the flow of the particle-bearing transport gas at a downstream discharge end of the tube cooling the tube momentarily to loosen the solids particle accumulation upon interrupting the flow of transport gas from the discharge end of the tube and removing the loosened solids particle accumulation upon resuming the flow of transport gas through the tube.
11. A method of removing accumulated deposits of finely-divided solids particles adhering to the interior surface of a tube through which the particles are carried in a transport gas, comprising the steps of passing a finely-divided particle-bearing transport gas through a tube in which the particles adhere to the interior surface thereof, and periodically blocking and then resuming the flow of the particle-bearing transport gas at a downstream discharge end of the tube dissipating the electrostatic charge imparted on the particles to loosen the solids particle accumulation upon inter-rupting the flow of transport gas from the discharge end of the tube and removing the loosened solids particle accumulation upon resuming the flow of transport gas through the tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000482479A CA1242186A (en) | 1985-05-27 | 1985-05-27 | Air recuperator cleaner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000482479A CA1242186A (en) | 1985-05-27 | 1985-05-27 | Air recuperator cleaner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1242186A true CA1242186A (en) | 1988-09-20 |
Family
ID=4130564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000482479A Expired CA1242186A (en) | 1985-05-27 | 1985-05-27 | Air recuperator cleaner |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1242186A (en) |
-
1985
- 1985-05-27 CA CA000482479A patent/CA1242186A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry | ||
| MKEX | Expiry |
Effective date: 20050920 |