CA2960508A1 - Air damper for a fire tube - Google Patents

Air damper for a fire tube Download PDF

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Publication number
CA2960508A1
CA2960508A1 CA2960508A CA2960508A CA2960508A1 CA 2960508 A1 CA2960508 A1 CA 2960508A1 CA 2960508 A CA2960508 A CA 2960508A CA 2960508 A CA2960508 A CA 2960508A CA 2960508 A1 CA2960508 A1 CA 2960508A1
Authority
CA
Canada
Prior art keywords
air
air damper
damper
burner
fire tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA2960508A
Other languages
French (fr)
Inventor
Greg Nuk
Rob Lundstrom
Willie Fisher
Frank Fan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Millstream Energy Products Ltd
Original Assignee
Millstream Energy Products Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Millstream Energy Products Ltd filed Critical Millstream Energy Products Ltd
Priority to CA2960508A priority Critical patent/CA2960508A1/en
Publication of CA2960508A1 publication Critical patent/CA2960508A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N3/00Regulating air supply or draught
    • F23N3/005Regulating air supply or draught using electrical or electromechanical means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/20Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L13/00Construction of valves or dampers for controlling air supply or draught
    • F23L13/02Construction of valves or dampers for controlling air supply or draught pivoted about a single axis but having not other movement
    • F23L13/04Construction of valves or dampers for controlling air supply or draught pivoted about a single axis but having not other movement with axis perpendicular to face

Abstract

An air damper for a fire tube includes an air damper body with a fixed plate having a plurality of air flow openings and a rotatable plate having a plurality of air flow openings. The air damper body has an air inlet face, an air outlet face, and an outer circumference. A central burner passage is provided through the air damper body. This central burner passage is adapted to receive a burner body. A deformable circumferential seal is provided around the outer circumference of the air damper body. This circumferential seal is adapted to engage an inner circumference of a fire tube solely by friction.

Description

TITLE
[0001] Air Damper For A Fire Tube FIELD
[0002] There is described an air damper which controls combustion air to a burner positioned in a fire tube.
BACKGROUND
[0003] United States Patent 4,702,692 (Burns et al) entitled "Air Reduction Controls for Oil-Treating Vessels", describes an air damper that has become a standard in the oil industry.
This air damper consists of a fixed plate having a plurality of air flow openings and a rotatable plate having a plurality of air flow openings. By rotating the rotatable plate, the air flow openings in the rotatable plate can either be brought into register with the air flow openings in the fixed plate or the air flow openings in the fixed plate can be at least partially blocked by the rotatable plate. The air damper of Burns et al was welded in a duct that extended radially from a fire tube.
SUMMARY
[0004] There is provided an air damper for a fire tube which includes an air damper body with a fixed plate having a plurality of air flow openings and a rotatable plate having a plurality of air flow openings. The air damper body has an air inlet face, an air outlet face, and an outer circumference. A central burner passage is provided through the air damper body. This central burner passage is adapted to receive a burner body. A
deformable circumferential seal is provided around the outer circumference of the air damper body. This circumferential seal is adapted to engage an inner circumference of a fire tube solely by friction.
[0005] As will hereinafter be further described, the use of circumferential seal has a dramatic beneficial effect on performance, when compared to the same assembly without a circumferential seal.
[0006] It is preferred that the rotatable plate is positioned at the inlet face of the air damper body and the fixed plate is positioned at the outlet face of the air damper body. With this configuration, the rotatable plate is more readily accessed for the purpose of making adjustments.
[0007] It is preferred that the outlet face of the air damper body has outwardly projecting air deflectors overlying the air flow openings of the fixed plate. This configuration imparts a helical flow to air flowing through the air damper body.
[0008] It is preferred that a handle is provided on the rotatable plate.
This enables a manual force to be exerted via the handle to rotate the rotatable plate thereby adjusting the position of the air flow openings of the rotatable plate relative to the air flow openings of the fixed plate.
[0009] It is preferred that an ignitor passage extend through the air damper body in parallel spaced relation to the central burner passage. This configuration enables an ignitor to be positioned to ignite combustion gas flowing through the burner body.
BRIEF DESCRIPTION OF 'THE DRAWINGS
[0010] These and other features will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to be in any way limiting, wherein:
[0011] FIG. 1 is a front elevation view of an air damper for a fire tube.
[0012] FIG. 2 is a front perspective view of the air damper illustrated in FIG. 1.
[0013] FIG. 3 is a rear elevation view of the air damper illustrated in FIG. 1.
[0014] FIG. 4 is a rear perspective view of the air damper illustrated in FIG. 1.
[0015] FIG. 5 is a top plan view of the air damper illustrated in FIG. 1.
[0016] FIG 6 is a rear perspective view of the air damper illustrated in FIG. 1, positioned in a fire tube.
[0017] FIG. 7 is a front perspective view of the air damper illustrated in FIG. 1, positioned in a fire tube.
[0018] FIG. 8 is a side elevation view, in section, of the air damper illustrated in FIG. 1, positioned in a fire tube.
[0019] FIG. 9 is a detailed side elevation view, in section, of the air damper illustrated in FIG. 1 positioned in a fire tube.
DETAILED DESCRIPTION
[0020] An air damper, generally identified by reference numeral 10, will now be described with reference to FIG. 1 through FIG. 9.
Structure and Relationship of Parts:
[0021] Referring to FIG. 5, air damper 10 includes an air damper body 12 with a fixed plate 14 and a rotatable plate 16. Referring to FIG. 1 and FIG. 2 fixed plate 14 has a plurality of air flow openings 18. Referring to FIG. 3 and FIG. 4, rotatable plate 16 also has a plurality of air flow openings 20. Referring to FIG. 5, air damper body 12 has an air inlet face 22, an air outlet face 24, and an outer circumference 26. Air, indicated by arrows 28, enters air damper body 12 through air inlet face 22 and exits air damper body 12 through air outlet face 24. Referring to FIG. 2, FIG. 4 and FIG. 5, a central burner passage 30 is provided through air damper body 12. Referring to FIG. 8, central burner passage 30 is adapted to receive a burner body 100, as will hereinafter be further described. Referring to FIG. 1 through FIG. 4, a circumferential seal 32 is provided around outer circumference 26 of air damper body 12.
Referring to FIG. 8, circumferential seal 32 is adapted to engage an inner circumference 102 of a fire tube 104 solely by friction.
[0022] Referring to FIG. 2, FIG. 4 and FIG. 5, it is preferred that rotatable plate 16 is positioned at inlet face 22 of air damper body 12 and that fixed plate 14 is positioned at outlet face 24 of air damper body 12. With this configuration, the rotatable plate is more readily accessed for the purpose of making adjustments.
[0023] Referring to FIG. 2 and FIG. 5, it is preferred that outlet face
24 of air damper body 12 has outwardly projecting air deflectors 34 overlying air flow openings 18 of fixed plate 14. This configuration imparts a helical flow to air flowing through air damper body 12.
[0024] Referring to FIG. 4 and FIG. 5, it is preferred that a handle 36 is provided on rotatable plate 16. This enables a manual force to be exerted via handle 36 to rotate rotatable plate 16 thereby adjusting the position of air flow openings 20 of rotatable plate 16 relative to air flow openings 18 of fixed plate 14.
[0025] Referring to FIG. 4 and FIG. 5, in order to prevent air flow from circumventing air damper body 12, fixed plate 14 and rotatable plate 16 are loosely clamped together. The term "loosely is used, as the mode of clamping must not impede rotation of rotatable plate 16. The mode of clamping illustrated are nuts 40 and bolts 42. Bolts 42 extend through fixed plate 14.
However, to facilitate rotation of rotatable plate 16, bolts 42 extend through slots 44 in rotatable plate 16.
[0026] Referring to FIG. 2, FIG. 4 and FIG. 5, It is preferred that an ignitor passage 46 extend through air damper body 12 in parallel spaced relation to central burner passage 30.
This configuration enables an ignitor 106 to be positioned to ignite combustion gas flowing through burner body 100.
Operation:
[0027] Referring to FIG. 6 through FIG. 8, burner body 100 has a nozzle end 108 and a fuel gas source attachment end 110. In preparation for installation, burner body 100 is inserted into central burner passage 30 of air damper body 12 With nozzle end 108 protruding passed air outlet face 24 of air damper body 12 and fuel gas source attachment end 110 protruding passed air inlet face 22 of air damper body 12. Air damper 12 is then inserted into fire tube 104. When air damper 12 is inserted into fire tube 104, circumferential seal 32 engages inner circumference 102 of fire tube 104 solely by friction. Referring to FIG. 9, it can be seen that circumferential seal 32 deforms to create an air seal.
Beneficial results have been obtained when circumferential seal 32 is made of a flexible, high temperature rated material, such as silicone. Referring to FIG. 8, either before or after insertion of air damper body 12 into fire tube 104 ignitor 106 extended through ignitor passage 46 and positioned relative to nozzle end 108 to ignite combustion gas flowing through burner body 100 to nozzle end 108.
[0028] Tests were conducted to determine the relative efficiency of air damper 10, with and without circumferential seal 32. It was determined that air damper 10 with circumferential seal 32 outperformed air damper 10 without circumferential seal 32. The increase in efficiency depended upon the turn down rate of the combustion system. For 5 example, when the combustion system firing rate was reduced to 40% of the maximum possible firing rate and rotatable plate 14 was rotated relative to fixed plate 14 to reduce the air flow through air damper body 12 to 40% of capacity (60% turn down), air damper 10 with circumferential seal 32 transferred up to 43% more heat into the process for the same quantity of gas consumed, as compared to combustion assemblies having air dampers without circumferential seal 32.
[0029] The gap about the periphery of the damper had never previously been considered a problem, because the air damper was never used to completely shut off the flow of air anyway. A peripheral seal was added, forcing all the air flow to pass through the damper.
The effect on efficiency was then measured. Marginal increases in efficiency were measured at lower turn down rates. However, as the turn down rates became higher, unexpected increases in efficiency were measured. As set forth above, with a 60% turn down rate, up to 43% more heat is transferred.
[0030] In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
[0031] The scope of the claims should not be limited by the illustrated embodiments set forth as examples, but should be given the broadest interpretation consistent with a purposive construction of the claims in view of the description as a whole.

Claims (8)

What is Claimed is:
1. An air damper for a fire tube, comprising:
an air damper body comprising a fixed plate having a plurality of air flow openings and a rotatable plate having a plurality of air flow openings, the air damper body having an air inlet face, an air outlet face, and an outer circumference;
a central burner passage through the air damper body, the central burner passage being adapted to receive a burner body; and a deformable circumferential seal around the outer circumference of the air damper body, the circumferential seal being adapted to engage an inner circumference of a fire tube solely by friction.
2. The air damper of Claim 1, wherein the rotatable plate is positioned at the inlet face of the air damper body and the fixed plate is positioned at the outlet face of the air damper body.
3. The air damper of Claim 2, wherein the outlet face of the air damper body has outwardly projecting air deflectors overlying the air flow openings of the fixed plate.
4. The air damper of Claim 2, wherein a handle is provided on the rotatable plate, whereby a manual force is exerted via the handle to rotate the rotatable plate thereby adjusting the position of the air flow openings of the rotatable plate relative to the air flow openings of the fixed plate.
5. The air damper of Claim 1, wherein an ignitor passage extends through the air damper body in parallel spaced relation to the central burner passage.
6. The air damper of Claim 1, in combination with a burner body, the burner body being positioned within the central burner passage of the air damper body, the burner body having a nozzle end protruding passed the air outlet face of the air damper body and a fuel gas source attachment end protruding passed the air inlet face of the air damper body.
7. The air damper of Claim 6, in combination with a fire tube.
8. An air damper for a fire tube having an inner circumference and a burner body disposed therein, the air damper comprising:
an air damper body comprising:
a central burner passage adapted to receive the burner body;
a peripheral seal adapted to engage the inner circumference of the fire tube;
and a plurality of air flow openings disposed about the central burner passage with the size of the air flow openings adjustable;
wherein, in use, air flow between the central burner passage and the burner body is impeded, air flow between the peripheral seal and the inner circumference of the fire tube is impeded, and air flow through the air flow openings is user adjustable.
CA2960508A 2017-03-08 2017-03-08 Air damper for a fire tube Abandoned CA2960508A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2960508A CA2960508A1 (en) 2017-03-08 2017-03-08 Air damper for a fire tube

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CA2960508A CA2960508A1 (en) 2017-03-08 2017-03-08 Air damper for a fire tube
CA2997493A CA2997493A1 (en) 2017-03-08 2018-03-06 Method of improving fire tube burner efficiency by controlling combustion air flow and an air damper for a fire tube
US15/914,217 US20180259184A1 (en) 2017-03-08 2018-03-07 Method of improving fire tube burner efficiency by controlling combustion air flow and an air damper for a fire tube

Publications (1)

Publication Number Publication Date
CA2960508A1 true CA2960508A1 (en) 2018-09-08

Family

ID=63444496

Family Applications (2)

Application Number Title Priority Date Filing Date
CA2960508A Abandoned CA2960508A1 (en) 2017-03-08 2017-03-08 Air damper for a fire tube
CA2997493A Pending CA2997493A1 (en) 2017-03-08 2018-03-06 Method of improving fire tube burner efficiency by controlling combustion air flow and an air damper for a fire tube

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA2997493A Pending CA2997493A1 (en) 2017-03-08 2018-03-06 Method of improving fire tube burner efficiency by controlling combustion air flow and an air damper for a fire tube

Country Status (2)

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US (1) US20180259184A1 (en)
CA (2) CA2960508A1 (en)

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Also Published As

Publication number Publication date
US20180259184A1 (en) 2018-09-13
CA2997493A1 (en) 2018-09-08

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