CA1050412A - Apparatus for adding combustion catalyst to a burner furnace - Google Patents
Apparatus for adding combustion catalyst to a burner furnaceInfo
- Publication number
- CA1050412A CA1050412A CA290,013A CA290013A CA1050412A CA 1050412 A CA1050412 A CA 1050412A CA 290013 A CA290013 A CA 290013A CA 1050412 A CA1050412 A CA 1050412A
- Authority
- CA
- Canada
- Prior art keywords
- furnace
- suction
- catalyst
- air
- conduit
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J7/00—Arrangement of devices for supplying chemicals to fire
Abstract
ABSTRACT OF THE DISCLOSURE
Apparatus for adding powdery combustion catalyst to a burner furnace combines mechanical feeder with an air injector to provide a simple device wherein the required volume of the addition of catalyst can be controlled solely by adjusting the speed of the mechanical feeder. The device is relatively easily installed as an auxiliary equipment of an existing burner furnace to increase the efficiency of same.
Apparatus for adding powdery combustion catalyst to a burner furnace combines mechanical feeder with an air injector to provide a simple device wherein the required volume of the addition of catalyst can be controlled solely by adjusting the speed of the mechanical feeder. The device is relatively easily installed as an auxiliary equipment of an existing burner furnace to increase the efficiency of same.
Description
10~041~
The present invention relates to an apparatus for feeding to a burner equipped furnace a powdery catalyst mixture. In particular the present invention is directed to an apparatus for use in existing liquid or solid fuel burner furnaces, normally comprising one or more burners.
With the increasing cost of li~uid fuels, attempts are being made to utilize solid fuels, such as coal, with chemical c~talyst mixtures. It is known from prior art to utilize solid fuel hurners. Reference may be had for instance to U.S. Patent 3,894,834 issued July 15, 1975 to James W. Estes, or to U.S. Patent 3,463,599 issued August 26, 1969 to A.B. Welty, Jr. The latter reference shows that it is also known from prior art to combine solid fuel combustion means with liquid fuel burners, in this particular reference for the purpose of burning excess oxygen in fluid gas produced by solid fuel burners. Further relevant prior art is represented by U.S. 3,291,182 issued December 30, 1966 to I.A. Dow, Jr. et al and U.S. Patent -~
1,164,139 issued December 14, 1915 to C~V. Stuart.
~he present invention relates to the art wherein powdery catalyst mixture i added to the flame cone of a furnace in ordex to achieve a more perfect combustion reaction to thus reduce fly ash handling, tube blowing time and stack temperature.
The use of powdery combustion catalysts (e.g. CO-M~TE-trade namP of Atlantic Combustion Products Limited) in burner furnaces is known. Normally, the catalyst i~ added, in relatively small volumes (less than lkg per 10 m2 of heating surface per 24 hours) by adding the catalyst into the coal hopper, by spreading same into the combustion chamber at shut-down times. On boilers working to capacity at all tlmes, , lOS041~
the application is normally split into two or three applications per 24 hours. The known methods are inconvenient and give rise to difficulties in achieving a uniform feed of the small volume of the catalyst over a relatively long period.
It is an object of the present in~ention to provide a relatively inexpensive apparatus for controlled adding of a powdery catalyst to a burner furnace. Another object of the present invention is to provide an inexpensive device of the above type which is particularly suitable as an addition to already existing furnaces. A still further object of the present invention is to provide a device wherein the appropriate, relatively small volume of the catalyst is continuously and selectively adjustable solely by adjusting the speed of mechanical portions of the catalyst feeding device.
According to one aspect of the present invention, an apparatus is provided for feeding to a burner equipped furnace a mixture of a powdery catalyst and air, said - -apparatus comprising, in combination:
a mechanical feeding device including hopper means for the catalyst, and mechanical conveyor means for conveying said catalyst from said hopper means to aischarge means of said mechanical feeding device; said discharge means being -coincident with an open ended upstream end of suction conduit means, the downstream end of said suction conduit means communicating with suction inducing means disposed in an air in~ection conduit; said air injection conduit being arranged to become secured to and to pass through a wall of said furnace such that an o~tlet orifice of the air injection conduit can be located within 6aid furnace at an injection : ~`
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point closely axially spaced from a ~urner of said furnace and generally coincident with the flame cone of said burner: !
and means for inducing air flow through said air injection conduit.
According to another aspect of the present invention apparatus is provided for adding to a burner equipped furnace a powdery mixture of comminuted combustion catalyst and air additional to the air-fuel mixture supplied to the burner or burners of said furnace, said apparatus comprising, in com-bination, a mechanical feeding device including hopper means for said catalyst and mechanical conveyor means for conveying said catalyst from said hopper means to a discharge end of said mechanical feeding device; said discharge end being coincident with an open ended upstream end of suction conduit means, the downstream end of said suction conduit means communicating : with suction inducing means disposed in an air injection conduit;
said air injection conduit being secured to and passing through a front wall of said furnace at a location spaced radially from an associated burner supported by said front wall, to define a generally straight injection pipe section extending ~20 interiorly of said furnace at an acute angle relative to the axis of said associated burner; the free end of said pipe section forming an outlet orifice closely spaced from said burner and being generally coincident-with the surface of the flane cone normally generated by said burner.
According to a still further aspect of the present invention, a liquid burner furnace is provided of the type comprising at least one liquid fuel burner secured to a wall of said furnace for projecting a fuel-air flame in a divergent generally conical pattern into said furnace; and an auxiliary feeding device for adding to said furnace a powdery mixture of a combustion catalyst, said feeding device comprising:
lOS04~
an air injection con~uit secured to and passing through said ~all, the discharge end of said conduit being spaced axially inwardly of said furnace relative to said burner and being generally coincident with the surface of said generally conical pattern at a point closely spaced from said burner;
said conduit being of the type of a generally straight pipe having an inlet end disposed exteriorly of said furnace and provided with air injecting means; said air injecting means being operatively connected to an outlet of a suction conduit the inlet of said suction conduit being disposed at a discharge end of mechanical feeding conveyor means, said conveyor means forming a part of a mechanical feeding device including hopper means within which a feeding end of said conveyor means .
is disposed; and air passage means disposed at the inlet of said suction conduit means and communicating said suction conduit means with atmospheric air; whereby said powdery catalyst i8 fed into said air injection conduit solely by the suction induced by said air injecting means.
The device according to the present invention further includes control means for selectively adjusting the rate of volume of the catalyst discharged at the upstream or inlet end ¦
of the suction conduit. The control means is preferably of the type of speed control means for governing the speed of the ~ -conveyor. In a preferred embodiment the conveyor is a screw conveyor and the speed control means is a variable speed gear box disposed between the screw conveyor and a drive motor.
Preferably, the mechanical feeding device comprises agitator means disposed within the hopper means and operative to prevent the bridging of the catal~st.
The suction inducing means is preferably an air injector.
The invention will now be described in a greater -~OS04:1~
detail with reference to the accompanying drawings in which;
Figure 1 is a simplified diagrammatic plan view, partly in section, showing a part of a liquid fuel bu~ner furnace equipped with the apparatus of the present invention;
Figure 2 is a schematic side view showing the general arrangement of one example of a mechanical feeding device for use in the present invention;
Figure 3 is a detail, in section, of part 17 as viewed in Figure 1 Figure 4 is a perspective view showing the arrangement of the suction conduit for use in the present invention;
Figure 5 is section V-V of Fiyure 4;
Figure 6 is a detail VI of Figure 1, showing the geometry of the discharge outlet of the apparatus of the present invention relative to the associated burner of the furnace.
Turning now to the drawings and ln particular to Figure 2, a base 1 supports a drive motor 2 whose output end is connected to the input end of a variable speed gear box 3 having an output shaft 4 connected, by a coupling 5, to a conveyor screw 6 located at the bottom of a hopper 7. An intermediate shaft 8 disposed between the coupling 5 and the conveyor screw 6 is provided with a sprocket gear 9 engaging . a chain 10 which is further engaged with a large diameter - sprocket 11 fixedly secured to one end of a shaft 12 provided with a plurality of stirring arms 13 disposed within the hopper 7, to prevent the bridging of the powdery catalyst material in the hopper.
Fixedly secured to the end of hopper 7 opposite to that of the sprocket gear 9 is a bearing housing 14 which .receives one end of the shaft of the conveyor screw 6, as best seen from Figure 5. The fixing of the bearing housing 14 to the .
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.
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the end wall of hopper 7 is effectea by fixedly securing the housing 14 to a trough-shaped container 15 whose top is open at 36 in proximity to the adjacent end of the conveyor screw 6 as best shown in Figure 4.
- Figure 5 shows that the trough-shaped container 15 is in a permanent communication with one end of a suction conduit 16. The opposite, downstream end of the conduit 16 communicates with suction side of an air injection 17 whose disposition is best seen in Figure 3.
The injector is of a well known structure including a generally T-shaped housing composed of a combining tube 27 and a delivery tube 28 disposed perpendicularly to the combining tube 27. A pressurized air conduit 29 passes through an inlet end 30 of the delivery tube 28, to terminate at an air nozzle 31 at a point axially :~
spaced from a discharge end 32 of the delivery tube 28 the discharge end 32 communicating with the inlet of an air injection conduit 19. The pressurized air conduit 29 is connected to a source of pressurized air of any suitable type, in the emhodiment shown, with a pressure air tank 35 (Figure 2) in which is stored compressed air at a suitable pressure. The -system may be provided with known air pressure control means such as a pressure control valve 34 shown in Figure 2.
Normally, the pressure within the air pipe 18 is maintained at about 80 psi to about 120 psi, depending upon the pressure within the furnace 21, to secure the generation of an appropriate suction effect at the combining tube 27 of the air ihjector 17.
As mentioned above, the outlet or discharge end of the air injector 17 communicates with the air injection conduit 19 passing through a wall 20 of a furnace 21. The air injection conduit lg is preferably straight and terminates at an outlet point 22 which is spaced from the associated burner 23 such .
, - . . .
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that the point 22 is spaced slightly axially inwardly relative to the orifice of burner 23 and is generally coincident with the surface of a flame cone 24 generated by burner 23. The term "generally coincident with flame cone 24" in this context, of course, means that the orifice or nozzle 22 is located slightly radially outwardly off the surface of the cone such as to utilize the suction generated by the cone 24 for inducing a suction assisting in removal of the catalyst mixture coming from the nozzle 22.
The burner 23 is a regular bunker oil firing burner whose structure and configuration is well known in the art.
Therefore, the ~urner and its associated parts suffice to be shown in schematic way as in Figure 1 or in Figure 6.
An exam~le of the arrangement of a burner 23 relative to the air injection unit is shown in Figure 6. In this arrangement, the buxner 23 is secured in a known way to a front wall 20 together with the outlet end section of the air injecting conduit 19. The burner 23 is of the type having flame apex angle a of about 45 as shown. The end section of the conduit 19 is convergent relative to the axis A of ; the flame cone, at about 12 with the orifice or outlet 33 (which is coincident with the aforesaid outlet point 22) being very closely spaced outwardly of the flame cone, in proximity ; to the burner 23. Such arrangement is of advantage as it - utilizes the effect of the flame and air vacuum at the outlet 33 to thoroughly disperse the catalyst powdèr delivered by pipe 19, to thus achieve a virtually complete reaction of the combus-tion. The pipe 19 in the embodiment shown is a heat resistant pipe made of standard stainless steel schedule 40, the pipe having 1-1/2" I.D. Its length ~from injector 17 to orifice 33) :
is about 3 feet. ~ :
'~ ' ' 105V41;~ ~
In operation, the burner 23 is first started. Pressure air valve 34 is adjusted to maintain a predetermined pressure in the pipe 29, as referred to above. The vacuum genera~ed in the injector produces air draw through the opening 36 in the trough-shaped container 15 and through the suction condui~
16. The motor 2 is then actuated to drive the conveyor screw such as to discharge th2 powdery catalyst into the trough-shaped container 15, through the opening 36. The induced air suction conveys the catalyst ~rom the container 15 to the combining tube 28 of the air injector 17, wherefrom the catalyst is forced by the air flow to enter the air iniection ~onduit 19 to eventually become discharged at the orifice or outlet 33O If it is desired to change the volume of the catalyst at the outlet 33, the gear box 3 is operated to change the speed of the screw 6 with the resulting change in volume of the catalyst discharged into the trough-shaped container 15.
The advantage of the present invention over prior art resides particularly in that the invention provides relatively inexpensive means for an appropriate, fine adjustment of the ratio of the catalyst mixture solely by mechanical means, i.e. by appropriate control of the speed of the conveyor screw 6. The device is easily applicable for use in existing burner furnaces.
It will be appreciated that many modifications of the embodiment described above are possible. For instance, the size or type of the mechanical feeding device will, of course, depend on actual operational conditions, of the thickness of furnace walls, etc. The exact location, disposition and size of the pipe 19 will obviously differ 3~ depending on the type of the furnace. These and many other modifications of the described embodiment, however, do not depart from the scope of th~ present invention as defined b in the accompanying claims.
, : , ' '' " ' ' '' `
The present invention relates to an apparatus for feeding to a burner equipped furnace a powdery catalyst mixture. In particular the present invention is directed to an apparatus for use in existing liquid or solid fuel burner furnaces, normally comprising one or more burners.
With the increasing cost of li~uid fuels, attempts are being made to utilize solid fuels, such as coal, with chemical c~talyst mixtures. It is known from prior art to utilize solid fuel hurners. Reference may be had for instance to U.S. Patent 3,894,834 issued July 15, 1975 to James W. Estes, or to U.S. Patent 3,463,599 issued August 26, 1969 to A.B. Welty, Jr. The latter reference shows that it is also known from prior art to combine solid fuel combustion means with liquid fuel burners, in this particular reference for the purpose of burning excess oxygen in fluid gas produced by solid fuel burners. Further relevant prior art is represented by U.S. 3,291,182 issued December 30, 1966 to I.A. Dow, Jr. et al and U.S. Patent -~
1,164,139 issued December 14, 1915 to C~V. Stuart.
~he present invention relates to the art wherein powdery catalyst mixture i added to the flame cone of a furnace in ordex to achieve a more perfect combustion reaction to thus reduce fly ash handling, tube blowing time and stack temperature.
The use of powdery combustion catalysts (e.g. CO-M~TE-trade namP of Atlantic Combustion Products Limited) in burner furnaces is known. Normally, the catalyst i~ added, in relatively small volumes (less than lkg per 10 m2 of heating surface per 24 hours) by adding the catalyst into the coal hopper, by spreading same into the combustion chamber at shut-down times. On boilers working to capacity at all tlmes, , lOS041~
the application is normally split into two or three applications per 24 hours. The known methods are inconvenient and give rise to difficulties in achieving a uniform feed of the small volume of the catalyst over a relatively long period.
It is an object of the present in~ention to provide a relatively inexpensive apparatus for controlled adding of a powdery catalyst to a burner furnace. Another object of the present invention is to provide an inexpensive device of the above type which is particularly suitable as an addition to already existing furnaces. A still further object of the present invention is to provide a device wherein the appropriate, relatively small volume of the catalyst is continuously and selectively adjustable solely by adjusting the speed of mechanical portions of the catalyst feeding device.
According to one aspect of the present invention, an apparatus is provided for feeding to a burner equipped furnace a mixture of a powdery catalyst and air, said - -apparatus comprising, in combination:
a mechanical feeding device including hopper means for the catalyst, and mechanical conveyor means for conveying said catalyst from said hopper means to aischarge means of said mechanical feeding device; said discharge means being -coincident with an open ended upstream end of suction conduit means, the downstream end of said suction conduit means communicating with suction inducing means disposed in an air in~ection conduit; said air injection conduit being arranged to become secured to and to pass through a wall of said furnace such that an o~tlet orifice of the air injection conduit can be located within 6aid furnace at an injection : ~`
~0S()4~L~
point closely axially spaced from a ~urner of said furnace and generally coincident with the flame cone of said burner: !
and means for inducing air flow through said air injection conduit.
According to another aspect of the present invention apparatus is provided for adding to a burner equipped furnace a powdery mixture of comminuted combustion catalyst and air additional to the air-fuel mixture supplied to the burner or burners of said furnace, said apparatus comprising, in com-bination, a mechanical feeding device including hopper means for said catalyst and mechanical conveyor means for conveying said catalyst from said hopper means to a discharge end of said mechanical feeding device; said discharge end being coincident with an open ended upstream end of suction conduit means, the downstream end of said suction conduit means communicating : with suction inducing means disposed in an air injection conduit;
said air injection conduit being secured to and passing through a front wall of said furnace at a location spaced radially from an associated burner supported by said front wall, to define a generally straight injection pipe section extending ~20 interiorly of said furnace at an acute angle relative to the axis of said associated burner; the free end of said pipe section forming an outlet orifice closely spaced from said burner and being generally coincident-with the surface of the flane cone normally generated by said burner.
According to a still further aspect of the present invention, a liquid burner furnace is provided of the type comprising at least one liquid fuel burner secured to a wall of said furnace for projecting a fuel-air flame in a divergent generally conical pattern into said furnace; and an auxiliary feeding device for adding to said furnace a powdery mixture of a combustion catalyst, said feeding device comprising:
lOS04~
an air injection con~uit secured to and passing through said ~all, the discharge end of said conduit being spaced axially inwardly of said furnace relative to said burner and being generally coincident with the surface of said generally conical pattern at a point closely spaced from said burner;
said conduit being of the type of a generally straight pipe having an inlet end disposed exteriorly of said furnace and provided with air injecting means; said air injecting means being operatively connected to an outlet of a suction conduit the inlet of said suction conduit being disposed at a discharge end of mechanical feeding conveyor means, said conveyor means forming a part of a mechanical feeding device including hopper means within which a feeding end of said conveyor means .
is disposed; and air passage means disposed at the inlet of said suction conduit means and communicating said suction conduit means with atmospheric air; whereby said powdery catalyst i8 fed into said air injection conduit solely by the suction induced by said air injecting means.
The device according to the present invention further includes control means for selectively adjusting the rate of volume of the catalyst discharged at the upstream or inlet end ¦
of the suction conduit. The control means is preferably of the type of speed control means for governing the speed of the ~ -conveyor. In a preferred embodiment the conveyor is a screw conveyor and the speed control means is a variable speed gear box disposed between the screw conveyor and a drive motor.
Preferably, the mechanical feeding device comprises agitator means disposed within the hopper means and operative to prevent the bridging of the catal~st.
The suction inducing means is preferably an air injector.
The invention will now be described in a greater -~OS04:1~
detail with reference to the accompanying drawings in which;
Figure 1 is a simplified diagrammatic plan view, partly in section, showing a part of a liquid fuel bu~ner furnace equipped with the apparatus of the present invention;
Figure 2 is a schematic side view showing the general arrangement of one example of a mechanical feeding device for use in the present invention;
Figure 3 is a detail, in section, of part 17 as viewed in Figure 1 Figure 4 is a perspective view showing the arrangement of the suction conduit for use in the present invention;
Figure 5 is section V-V of Fiyure 4;
Figure 6 is a detail VI of Figure 1, showing the geometry of the discharge outlet of the apparatus of the present invention relative to the associated burner of the furnace.
Turning now to the drawings and ln particular to Figure 2, a base 1 supports a drive motor 2 whose output end is connected to the input end of a variable speed gear box 3 having an output shaft 4 connected, by a coupling 5, to a conveyor screw 6 located at the bottom of a hopper 7. An intermediate shaft 8 disposed between the coupling 5 and the conveyor screw 6 is provided with a sprocket gear 9 engaging . a chain 10 which is further engaged with a large diameter - sprocket 11 fixedly secured to one end of a shaft 12 provided with a plurality of stirring arms 13 disposed within the hopper 7, to prevent the bridging of the powdery catalyst material in the hopper.
Fixedly secured to the end of hopper 7 opposite to that of the sprocket gear 9 is a bearing housing 14 which .receives one end of the shaft of the conveyor screw 6, as best seen from Figure 5. The fixing of the bearing housing 14 to the .
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.
10~04~
the end wall of hopper 7 is effectea by fixedly securing the housing 14 to a trough-shaped container 15 whose top is open at 36 in proximity to the adjacent end of the conveyor screw 6 as best shown in Figure 4.
- Figure 5 shows that the trough-shaped container 15 is in a permanent communication with one end of a suction conduit 16. The opposite, downstream end of the conduit 16 communicates with suction side of an air injection 17 whose disposition is best seen in Figure 3.
The injector is of a well known structure including a generally T-shaped housing composed of a combining tube 27 and a delivery tube 28 disposed perpendicularly to the combining tube 27. A pressurized air conduit 29 passes through an inlet end 30 of the delivery tube 28, to terminate at an air nozzle 31 at a point axially :~
spaced from a discharge end 32 of the delivery tube 28 the discharge end 32 communicating with the inlet of an air injection conduit 19. The pressurized air conduit 29 is connected to a source of pressurized air of any suitable type, in the emhodiment shown, with a pressure air tank 35 (Figure 2) in which is stored compressed air at a suitable pressure. The -system may be provided with known air pressure control means such as a pressure control valve 34 shown in Figure 2.
Normally, the pressure within the air pipe 18 is maintained at about 80 psi to about 120 psi, depending upon the pressure within the furnace 21, to secure the generation of an appropriate suction effect at the combining tube 27 of the air ihjector 17.
As mentioned above, the outlet or discharge end of the air injector 17 communicates with the air injection conduit 19 passing through a wall 20 of a furnace 21. The air injection conduit lg is preferably straight and terminates at an outlet point 22 which is spaced from the associated burner 23 such .
, - . . .
losa4~
that the point 22 is spaced slightly axially inwardly relative to the orifice of burner 23 and is generally coincident with the surface of a flame cone 24 generated by burner 23. The term "generally coincident with flame cone 24" in this context, of course, means that the orifice or nozzle 22 is located slightly radially outwardly off the surface of the cone such as to utilize the suction generated by the cone 24 for inducing a suction assisting in removal of the catalyst mixture coming from the nozzle 22.
The burner 23 is a regular bunker oil firing burner whose structure and configuration is well known in the art.
Therefore, the ~urner and its associated parts suffice to be shown in schematic way as in Figure 1 or in Figure 6.
An exam~le of the arrangement of a burner 23 relative to the air injection unit is shown in Figure 6. In this arrangement, the buxner 23 is secured in a known way to a front wall 20 together with the outlet end section of the air injecting conduit 19. The burner 23 is of the type having flame apex angle a of about 45 as shown. The end section of the conduit 19 is convergent relative to the axis A of ; the flame cone, at about 12 with the orifice or outlet 33 (which is coincident with the aforesaid outlet point 22) being very closely spaced outwardly of the flame cone, in proximity ; to the burner 23. Such arrangement is of advantage as it - utilizes the effect of the flame and air vacuum at the outlet 33 to thoroughly disperse the catalyst powdèr delivered by pipe 19, to thus achieve a virtually complete reaction of the combus-tion. The pipe 19 in the embodiment shown is a heat resistant pipe made of standard stainless steel schedule 40, the pipe having 1-1/2" I.D. Its length ~from injector 17 to orifice 33) :
is about 3 feet. ~ :
'~ ' ' 105V41;~ ~
In operation, the burner 23 is first started. Pressure air valve 34 is adjusted to maintain a predetermined pressure in the pipe 29, as referred to above. The vacuum genera~ed in the injector produces air draw through the opening 36 in the trough-shaped container 15 and through the suction condui~
16. The motor 2 is then actuated to drive the conveyor screw such as to discharge th2 powdery catalyst into the trough-shaped container 15, through the opening 36. The induced air suction conveys the catalyst ~rom the container 15 to the combining tube 28 of the air injector 17, wherefrom the catalyst is forced by the air flow to enter the air iniection ~onduit 19 to eventually become discharged at the orifice or outlet 33O If it is desired to change the volume of the catalyst at the outlet 33, the gear box 3 is operated to change the speed of the screw 6 with the resulting change in volume of the catalyst discharged into the trough-shaped container 15.
The advantage of the present invention over prior art resides particularly in that the invention provides relatively inexpensive means for an appropriate, fine adjustment of the ratio of the catalyst mixture solely by mechanical means, i.e. by appropriate control of the speed of the conveyor screw 6. The device is easily applicable for use in existing burner furnaces.
It will be appreciated that many modifications of the embodiment described above are possible. For instance, the size or type of the mechanical feeding device will, of course, depend on actual operational conditions, of the thickness of furnace walls, etc. The exact location, disposition and size of the pipe 19 will obviously differ 3~ depending on the type of the furnace. These and many other modifications of the described embodiment, however, do not depart from the scope of th~ present invention as defined b in the accompanying claims.
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Claims (20)
1. Apparatus for feeding to a burner furnace a powdery mixture of a combustion catalyst, said apparatus comprising, in combination:
a) a mechanical feeding device including hopper means for the catalyst, and mechanical conveyor means for conveying said catalyst from said hopper means to discharge means of said mechanical feeding device;
b) suction means having an upstream end and a downstream end, said upstream end being generally coincident with the discharge means and being open to communicate with ambient atmosphere;
c) an air injection conduit including suction inducing means, said suction inducing means communicating with said downstream end of said suction means, said air injection conduit being arranged to become secured to and to pass through a wall of said furnace such that an outlet orifice of the air injection conduit can be located within said furnace at an injection point closely axially spaced from a burner of a furnace and generally coincident with a flame cone thereof; and d) means for inducing air flow through said air injection conduit.
a) a mechanical feeding device including hopper means for the catalyst, and mechanical conveyor means for conveying said catalyst from said hopper means to discharge means of said mechanical feeding device;
b) suction means having an upstream end and a downstream end, said upstream end being generally coincident with the discharge means and being open to communicate with ambient atmosphere;
c) an air injection conduit including suction inducing means, said suction inducing means communicating with said downstream end of said suction means, said air injection conduit being arranged to become secured to and to pass through a wall of said furnace such that an outlet orifice of the air injection conduit can be located within said furnace at an injection point closely axially spaced from a burner of a furnace and generally coincident with a flame cone thereof; and d) means for inducing air flow through said air injection conduit.
2. Apparatus as claimed in claim 1, wherein said mechanical feeding device further includes control means for selectively adjusting the rate of volume of said catalyst discharged at said upstream end of the suction conduit.
3. Apparatus as claimed in claim 2, wherein said control means is a speed control means for governing the speed of said conveyor means.
4. Apparatus as claimed in Claim 3, wherein said conveyor means is a screw conveyor located in said hopper means near the bottom thereof, said speed control means being a variable speed gear box disposed between said screw conveyor and a drive motor.
5. Apparatus as claimed in Claim 4, wherein said mechanical feeding device further comprises agitator means disposed within said hopper means and operative to prevent the bridging of said powdery catalyst.
6. Apparatus as claimed in Claim 5, wherein said suction inducing means is an air injector.
7. Apparatus as claimed in Claim 6, wherein said upstream end of said suction conduit means comprises a horizontally elongated container of a generally trough-shaped configuration, said container being located below and closely spaced from said discharge means of the mechanical feeding device.
8. Apparatus for adding to a burner equipped furnace a powdery mixture of a combustion catalyst and air additional to air/fuel mixture supplied to the burner or burners of said furnace, said apparatus comprising, in combination:
a) a mechanical feeding device including hopper means for the catalyst and mechanical conveyor means for conveying said catalyst from said hopper means to a discharge end of said mechanical feeding device;
b) suction means having an upstream end and a downstream end, said upstream end being generally coincident with the discharge means and being open to communicate with ambient atmosphere;
c) an air injection conduit including suction inducing means, said suction inducing means communicating with said downstream end of said suction means, said air injection conduit being arranged to become secured to and to pass through a wall of said furnace such that an outlet orifice of the air injection conduit can be located within said furnace at an injection point closely axially spaced from a burner of a furnace and generally coincident with a flame cone thereof;
d) the free end of said pipe section forming an outlet orifice closely spaced from said burner and being generally coincident with the surface of the flame cone normally generated by said burner.
a) a mechanical feeding device including hopper means for the catalyst and mechanical conveyor means for conveying said catalyst from said hopper means to a discharge end of said mechanical feeding device;
b) suction means having an upstream end and a downstream end, said upstream end being generally coincident with the discharge means and being open to communicate with ambient atmosphere;
c) an air injection conduit including suction inducing means, said suction inducing means communicating with said downstream end of said suction means, said air injection conduit being arranged to become secured to and to pass through a wall of said furnace such that an outlet orifice of the air injection conduit can be located within said furnace at an injection point closely axially spaced from a burner of a furnace and generally coincident with a flame cone thereof;
d) the free end of said pipe section forming an outlet orifice closely spaced from said burner and being generally coincident with the surface of the flame cone normally generated by said burner.
9. Apparatus as claimed in claim 8, wherein said mechanical feeding device further includes control means for selectively adjusting the rate of volume of said catalyst-discharged at said upstream end of the suction conduit.
10. Apparatus as claimed in claim 9, wherein said control means is speed control means for governing the speed of said conveyor means.
11. Apparatus as claimed in claim 10 wherein said conveyor means is a screw conveyor located in said hopper means near the bottom thereof, said speed control means being a variable speed gear box disposed between said screw conveyor and a drive motor.
12. Apparatus as claimed in claim 11, wherein said mechanical feeding device further comprises agitator means disposed within said hopper means and operative to prevent the bridging of said catalyst.
13. Apparatus as claimed in Claim 12, wherein said suction inducing means is an air injector.
14. Apparatus as claimed in claim 13, wherein said upstream end of said suction conduit comprises horizontally elongated container of a generally trough-shaped configuration, said container being located below and closely spaced from said discharge end.
15. In combination, a burner furnace of the type comprising at least one burner secured to a wall of said furnace for projecting a fuel-air flame in a divergent, generally conical pattern into said furnace, combustion catalyst feeding device for adding to said furnace a powdery mixture of the catalyst and air, said catalyst feeding device comprising an injection conduit secured to and passing through said wall, the discharge end of said conduit being spaced axially inwardly of said furnace relative to said burner and being generally coincident with the surface of said generally conical pattern at a point closely spaced from said burner; said conduit being of the type of a generally straight pipe having an inlet end disposed exteriorly of said furnace and provided with air injecting means; said air injecting means being operatively connected to an outlet of a suction conduit, the inlet of said suction conduit being disposed at a discharge end of a mechanical feeding conveyor means; said conveyor means forming a part of a mechanical feeding device including hopper means within which a feeding end of said conveyor means is disposed;
air passage means disposed at the inlet of said suction conduit means and communicating said suction conduit means with atmospheric air; whereby said powdery catalyst can be fed into said air injection conduit solely by the suction induced by said air injecting means.
air passage means disposed at the inlet of said suction conduit means and communicating said suction conduit means with atmospheric air; whereby said powdery catalyst can be fed into said air injection conduit solely by the suction induced by said air injecting means.
16. The combination as claimed in claim 15, wherein said mechanical feeding device further includes control means for selectively adjusting the rate of volume of said catalyst discharged at said upstream end of the such conduit.
17. The combination as claimed in claim 16, wherein said control means is a speed control means for covering the speed of said conveyor means.
18. The combination as claimed in claim 17 wherein said conveyor means is a screw conveyor located in said hopper means near the bottom thereof, said speed control means being a variable speed gear box disposed between said screw conveyor and a drive motor.
19. The combination as claimed in claim 18, wherein said mechanical feeding device further comprises agitator means disposed within said hopper means and operative to prevent the bridging of said powdery catalyst.
20. The combination as claimed in claim 19, wherein said inlet end of said suction conduit comprises a horizontally elongated container of a generally trough-shaped configuration, said container being located below and closely spaced from said discharge end of said mechanical feeding conveyor means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA290,013A CA1050412A (en) | 1977-11-01 | 1977-11-01 | Apparatus for adding combustion catalyst to a burner furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA290,013A CA1050412A (en) | 1977-11-01 | 1977-11-01 | Apparatus for adding combustion catalyst to a burner furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1050412A true CA1050412A (en) | 1979-03-13 |
Family
ID=4109917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA290,013A Expired CA1050412A (en) | 1977-11-01 | 1977-11-01 | Apparatus for adding combustion catalyst to a burner furnace |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1050412A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0119086A2 (en) * | 1983-03-10 | 1984-09-19 | Fuel Tech, Inc. | Catalyst system for delivering catalytic material to a selected portion of a combustion chamber |
| US8196533B2 (en) | 2008-10-27 | 2012-06-12 | Kentucky-Tennessee Clay Co. | Methods for operating a fluidized-bed reactor |
| CN116624879A (en) * | 2023-07-25 | 2023-08-22 | 山西鸿泰来科技有限公司 | Gas diffusion ignition torch |
-
1977
- 1977-11-01 CA CA290,013A patent/CA1050412A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0119086A2 (en) * | 1983-03-10 | 1984-09-19 | Fuel Tech, Inc. | Catalyst system for delivering catalytic material to a selected portion of a combustion chamber |
| EP0119086A3 (en) * | 1983-03-10 | 1985-06-19 | Fuel Tech, Inc. | Catalyst system for delivering catalytic material to a selected portion of a combustion chamber |
| US8196533B2 (en) | 2008-10-27 | 2012-06-12 | Kentucky-Tennessee Clay Co. | Methods for operating a fluidized-bed reactor |
| CN116624879A (en) * | 2023-07-25 | 2023-08-22 | 山西鸿泰来科技有限公司 | Gas diffusion ignition torch |
| CN116624879B (en) * | 2023-07-25 | 2023-09-15 | 山西鸿泰来科技有限公司 | Gas diffusion ignition torch |
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