US20170051983A1 - Flexible seal for a rotary regenerative preheater - Google Patents
Flexible seal for a rotary regenerative preheater Download PDFInfo
- Publication number
- US20170051983A1 US20170051983A1 US14/829,210 US201514829210A US2017051983A1 US 20170051983 A1 US20170051983 A1 US 20170051983A1 US 201514829210 A US201514829210 A US 201514829210A US 2017051983 A1 US2017051983 A1 US 2017051983A1
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- United States
- Prior art keywords
- leaf
- assembly
- base section
- distal end
- spacer
- 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
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
- F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
- F28D19/047—Sealing means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3268—Mounting of sealing rings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
- F16J15/3292—Lamellar structures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING 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
- F23L15/00—Heating of air supplied for combustion
- F23L15/02—Arrangements of regenerators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F11/00—Arrangements for sealing leaky tubes and conduits
- F28F11/02—Arrangements for sealing leaky tubes and conduits using obturating elements, e.g. washers, inserted and operated independently of each other
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
- F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
- F28D19/041—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier with axial flow through the intermediate heat-transfer medium
- F28D19/042—Rotors; Assemblies of heat absorbing masses
- F28D19/044—Rotors; Assemblies of heat absorbing masses shaped in sector form, e.g. with baskets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2230/00—Sealing means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Definitions
- This invention relates to a flexible seal for a rotary regenerative preheater, and more particularly to a flexible seal having multiple leafs.
- a rotary regenerative air preheater (hereinafter referred to as the “preheater”) is generally designated by the numeral 10 .
- the preheater 10 includes a rotor assembly 12 rotatably mounted on a rotor post 16 .
- the rotor assembly 12 is positioned in and rotates relative to a housing 14 .
- the rotor assembly 12 is rotatable about an axis A of the rotor post 16 in the direction indicated by the arrow R.
- the rotor assembly 12 includes partitions 18 (e.g., diaphragms) extending radially from the rotor post 16 to an outer periphery of the rotor assembly 12 . Adjacent pairs of the partitions 18 define respective compartments 20 for receiving a heat transfer assembly 1000 .
- Each of the heat transfer assemblies 1000 include a plurality of heat transfer sheets 100 and/or 200 stacked upon one another.
- preheater 10 is a bisector configuration in which the housing 14 includes a flue gas inlet duct 22 and a flue gas outlet duct 24 for channeling the flow of heated flue gases through the preheater 10 .
- the housing 14 further includes an air inlet duct 26 and an air outlet duct 28 for channeling the flow of combustion air through the preheater 10 .
- the preheater 10 includes an upper sector plate 30 A extending across the housing 14 adjacent to an upper face of the rotor assembly 12 .
- the preheater 10 includes a lower sector plate 30 B extending across the housing 14 adjacent to lower face of the rotor assembly 12 .
- the upper sector plate 30 A extends between and is joined to the flue gas inlet duct 22 and the air outlet duct 28 .
- the lower sector plate 30 B extends between and is joined to the flue gas outlet duct 24 and the air inlet duct 26 .
- the upper and lower sector plates 30 A, 30 B, respectively, are joined to one another by a circumferential plate 30 C.
- the upper sector plate 30 A and the lower sector plate 30 B divide the preheater 10 into an air sector 32 and a gas sector 34 .
- the arrows marked ‘A’ indicate the direction of a flue gas stream 36 through the gas sector 34 of the rotor assembly 12 .
- the arrows marked ‘B’ indicate the direction of a combustion air stream 38 through the air sector 32 of the rotor assembly 12 .
- the flue gas stream 36 enters through the flue gas inlet duct 22 and transfers heat to the heat transfer assembly 1000 mounted in the compartments 20 .
- the heated heat transfer assembly 1000 is rotated into the air sector 32 of the preheater 10 . Heat stored in the heat transfer assembly 1000 is then transferred to the combustion air stream 38 entering through the air inlet duct 26 .
- the heat absorbed from the hot flue gas stream 36 entering into the preheater 10 is utilized for heating the heat transfer assemblies 1000 , which in turn heats the combustion air stream 38 entering the preheater 10 .
- a prior art seal 40 extends axially from (i.e., parallel to the axis A) and radially along an edge of each of the diaphragms 18 towards the sector plate 30 A.
- Another seal 40 extends axially from and radially along an opposite side of each of the diaphragms 18 towards the sector plate 30 B (only one seal 40 shown in FIG. 1 ).
- the seal 40 typically includes a flexible seal leaf 42 having a base portion 42 B that is positioned between an L-shaped backing bar 43 and an elongate holding bar 41 .
- a base portion 41 B of the holding bar 41 , the base portion 42 B of the flexible seal 42 and a base portion 43 B of the backing bar 43 are secured by a plurality of bolts 45 and nuts 46 between a spacer bar 44 and the diaphragm 18 , radially along a length of the diaphragm 18 .
- a surface 31 ′ of the sector plates 30 A and 30 B is spaced apart from a distal end of the seal 40 .
- the surface 31 of the sector plates 30 A and 30 B slidingly engage the respective seal 40 .
- Such sliding engagement causes the flexible seal leaf 42 to wear and results in bypass leakage between the air sector 32 and the gas sector 34 .
- the inventors have surprisingly found that such sliding engagement of the seal 40 with the respective sector plate 30 A and 30 B results in oscillatory vibration of the seal 40 , as indicated by the arrow V, causing fatigue failure thereof.
- the inventors have discovered that because the seal 40 is mounted on a leading edge of the diaphragm 18 , the edge of the diaphragm 18 acts as an abrupt fulcrum 47 upon which the seal 40 is bent over and causes stress concentrations at the mating portion of the seal 40 . Such stress concentrations cause premature failure of the seal 40 .
- the seal assembly includes a leaf assembly and a supplemental leaf assembly.
- the leaf assembly includes a first leaf having a first base section.
- the first base section defines a first fastening area for securing the first leaf to a diaphragm of the preheater.
- the first leaf has a first elongate section extending away from the first base section and terminating at a first distal end thereof.
- the leaf assembly further includes a second leaf that engages a portion of the first leaf.
- the second leaf has a second base section.
- the second base section defines a second fastening area for securing the second leaf to the diaphragm.
- the second leaf has a second elongate section extending away from the second base section and terminating at a second distal end thereof.
- the supplemental leaf assembly is secured to the first leaf and slidingly engaging the second leaf.
- the second distal end of the second leaf terminates between the first distal end and the first base section of the first leaf.
- the supplemental leaf assembly includes a spacer secured to the first leaf and a third leaf secured to the spacer, for example by one or more rivets or spot welds.
- the third leaf slidingly engages the second leaf.
- the second distal end of the second leaf terminates between the first distal end and the first base section;
- the supplemental leaf assembly includes a spacer secured to the first leaf and a third leaf secured to the spacer, the third leaf slidingly engages the second leaf; and the spacer is positioned between the first leaf and the third leaf, the spacer is spaced apart from the second distal end thereby defining a gap between the spacer and the second distal end to accommodate movement of the spacer relative to the second distal end.
- the seal assembly includes a one or more displacement members.
- Each of the displacement members has a first engagement portion configured to displace a portion of the leaf assembly a predetermined distance.
- the each of displacement members has an L-shaped configuration defining a first leg and a second leg. The first leg defines a third base portion that is secured to the diaphragm and the second leg has the engagement portion thereon.
- the displacement members are arranged to establish a predefined contour of the leaf assembly. The predetermined contour is configured to compensate for movement of the preheater during operation.
- the seal assembly includes a strip (e.g., guard and/or limiter) having fourth base section engaging the second base section such that the second base section is positioned between the first base section and the fourth base section.
- the strip defines a deflector section extending away from the fourth base section and away from the second leaf.
- the preheater assembly includes a rotor assembly rotatably mounted on a rotor post and disposed in a housing.
- the rotor assembly defines diaphragms extending radially from the rotor post to an outer periphery of the rotor assembly. Adjacent pairs of the diaphragms define respective compartments for receiving a heat transfer assembly.
- Each of the heat transfer assemblies include a plurality of heat transfer sheets stacked upon one another.
- the housing including a flue gas inlet duct and a flue gas outlet duct for channeling the flow of heated flue gases through the preheater
- the housing also includes an air inlet duct and an air outlet duct for channeling the flow of combustion air through the preheater.
- the preheater includes an upper sector plate extending across the housing adjacent to an upper face of the rotor assembly and a lower sector plate extending across the housing adjacent to lower face of the rotor assembly.
- the upper sector plate extends between and is joined to the flue gas inlet duct and the air outlet duct; and the lower sector plate extends between and is joined to the flue gas outlet duct and the air inlet duct.
- the upper and lower sector plates, respectively, are joined to one another by a circumferential plate.
- the upper sector plate and/or the lower sector plate define a leading edge and a trailing edge. One or more of the leading edge and the trailing edge defines a ramped configuration.
- a seal assembly is positioned on an axial edge of each diaphragm.
- the seal assembly includes a leaf assembly and a supplemental leaf assembly.
- the leaf assembly includes a first leaf having a first base section.
- the first base section defines a first fastening area for securing the first leaf to a diaphragm of the preheater.
- the first leaf has a first elongate section extending away from the first base section and terminating at a first distal end thereof.
- the leaf assembly further includes a second leaf that engages a portion of the first leaf.
- the second leaf has a second base section.
- the second base section defines a second fastening area for securing the second leaf to the diaphragm.
- the second leaf has a second elongate section extending away from the second base section and terminating at a second distal end thereof.
- the supplemental leaf assembly is secured to the first leaf and slidingly engages the second leaf. A portion of the first leaf slidingly engages the leading edge and disengages the trailing edge.
- the second distal end terminates between the first distal end and the first base section.
- the supplemental leaf assembly includes a spacer secured to the first leaf and a third leaf secured to the spacer. The third leaf slidingly engages the second leaf.
- FIG. 1 is a perspective view of a preheater shown in a partial cut away view
- FIG. 2 is a cross sectional view of a prior art seal secured to a diaphragm of a preheater
- FIG. 3 is a plan view of the seal assembly of the present invention viewed from a trailing side of the diaphragm;
- FIG. 4 is a plan view of the seal assembly of the present invention viewed from a leading side of the diaphragm;
- FIG. 5 is a top view of the seal assembly of FIG. 4 taken across line 5 - 5 of FIG. 4 ;
- FIG. 6 is a cross sectional view of the seal assembly of FIG. 3 taken across line 6 - 6 of FIG. 4 ;
- FIG. 7 is another embodiment of the seal assembly of FIG. 6 shown with a sector plate having a ramped configuration
- FIG. 8 is another embodiment of the seal assembly of FIG. 7 wherein the ramped configuration includes a ramp attachment secured to each of the leading and trailing edges of the sector plates;
- FIG. 9 is a cross sectional view of a portion of another embodiment of the seal assembly of FIG. 6 and having one leaf extending outwardly from the other leaves;
- FIG. 10 is a cross sectional view of a portion of another embodiment of the seal assembly of FIG. 6 wherein the spacer is formed by a bend in a first leaf;
- FIG. 11 is a cross sectional view of a portion of another embodiment of the seal assembly of FIG. 6 wherein the spacer is formed by a rivets and spacer rings;
- FIG. 12 is a cross sectional view of a portion of another embodiment of the seal assembly of FIG. 6 wherein the spacer is formed by a bend in a second leaf.
- a seal assembly of the present invention is generally designated by the numeral 140 .
- One of the seal assemblies 140 is secured to opposing axially edges of each of the diaphragms 18 of the bisector type preheater of FIG. 1 by a suitable fastener system such as a plurality of bolts 145 and nuts 146 .
- a suitable fastener system such as a plurality of bolts 145 and nuts 146 .
- Other methods of fastening the seal assemblies 140 to the diaphragms 18 may be employed such as but not limited to welding and brazing.
- Each of the seal assemblies 140 are a generally elongate member that extends between the rotor post 16 and a radially outward peripheral edge of the diaphragm 18 , as shown in FIGS. 3 and 4 .
- seal assembly 140 is described as being employed in a bisector type preheater, the present invention is not limited in this regard as the seal assembly may be employed in a tri-sector or quad sector preheater, without departing from the broader aspects disclosed herein.
- each of the seal assemblies 140 includes a leaf assembly 50 having a first leaf 52 having a first base section 52 B.
- the first base section 52 B defines a first fastening area, for example, a flat section and a bore extending therethrough for receiving one of the bolts 145 for securing the first leaf 52 to the diaphragm 18 of the preheater 10 of FIG. 1 .
- the first leaf 52 has a first elongate section 52 L extending away from the first base section 52 B and terminating at a first distal end 52 D thereof.
- each of the seal assemblies 140 includes a second leaf 54 engaging a portion of the first leaf 52 and having a second base section 54 B.
- the second base section 54 B defines a second fastening area, for example, a flat section and a bore extending therethrough for receiving one of the bolts 145 for securing the second leaf 54 to the diaphragm 18 of the preheater 10 of FIG. 1 .
- the second leaf 54 has a second elongate section 54 L extending away from the second base section 54 B and terminating at a second distal end 54 D thereof.
- the second distal end 54 D terminates along a length of the first leaf 52 between the first distal end 52 D and the first base section 52 B of the first leaf 52 .
- each of the seal assemblies 140 includes a supplemental leaf assembly 60 secured to (e.g., via suitable fastening structures 61 such as rivets or spot welds) the first leaf 52 and slidingly engages the second leaf 54 .
- the supplemental leaf assembly 60 includes a spacer 62 (e.g., a spacer leaf) secured to (e.g., via the fastening structures 61 ) the first leaf 52 .
- the spacer 62 defines a distal end 62 D.
- the supplemental leaf assembly 60 includes a third leaf 64 secured to (e.g., via the fastening structures 61 ) the spacer 62 .
- the third leaf 64 slidingly engages a portion of the second leaf 54 .
- the third leaf 64 defines a third distal end 64 D.
- the spacer 62 is positioned between the first leaf 52 and the third leaf 64 .
- the spacer 62 is spaced apart from the second distal end 54 D thereby defining a gap G between the spacer 62 and the second distal end 54 D to accommodate movement of the spacer 62 relative to the second distal end 54 D. While the spacer 62 is described and shown in FIG. 6 as being a leaf, the present invention is not limited in this regard as other spacer configurations may be employed including but not limited to: 1) a spacer 162 L formed as a leg as a result of a bend 152 D in the first leaf 152 as shown in FIG.
- the distal ends 52 D, 62 D and 64 D are aligned with one another.
- the distal end 52 D of the first leaf 52 is shown slidingly engaging the surface 31 of the sector plate 30 A during reduced (e.g., 30 percent load or less) or zero load operation.
- Another of the spacers 62 of a seal assembly 140 positioned on an opposite side of the diaphragm 18 , slidingly engages the surface 31 of the sector plate 30 B.
- the distal end 54 D is spaced apart from the surface 31 ′ of the sector plate 30 A by a gap G 1 that reduces hot end radial seal gap by fifty percent at full load compared to the prior art seal assemblies 40 .
- distal ends 52 D, 62 D and 64 D are aligned with one another
- the present invention is not limited in this regard as one or more of the distal ends 52 D, 62 D and 64 D may extend outwardly from one another, as shown in FIG. 9 wherein the distal end 62 D extends outwardly from the distal ends 52 D and 64 D.
- portions of the spacer 62 on and adjacent to the distal end 62 D are formed of a wear resistant configuration such as but not limited to a surface hardfacing weld overlay (e.g., a cobalt based weld material), a case hardened layer (e.g., nitriding, carburizing or other diffusion type hardening) and a precipitation hardened material.
- a surface hardfacing weld overlay e.g., a cobalt based weld material
- a case hardened layer e.g., nitriding, carburizing or other diffusion type hardening
- first leaf 52 , the second leaf 54 , the third leaf 62 and/or the fourth leaf 64 are manufactured from an austenitic stainless steel, for example a 301 stainless steel. In one embodiment the first leaf 52 , the second leaf 54 , the third leaf 62 and/or the fourth leaf 64 are about 0.02 to 0.025 inches thick.
- the seal assembly 140 includes three displacement members 70 having side edges 70 E that abut one another. While three displacement members 70 are shown the present invention is not limited in this regard as the displacement members 70 may be formed in one integral piece or any number of segments to facilitate installation.
- each of the plurality of displacement members 70 has an L-shaped configuration defining a first leg 71 and a second leg 72 .
- the first leg defines a third base section 71 B.
- the third base section 71 B defines a third fastening area, for example, a flat section and a bore extending therethrough for receiving one of the bolts 145 for securing the displacement member 70 to the diaphragm 18 of the preheater 10 of FIG. 1 .
- each of second legs 72 defines an engagement portion 72 T configured to engage a surface 52 F of the first leaf 52 and to displace a portion of the leaf assembly 50 a predetermined distance, as described further herein.
- Each of the engagement portions 72 T have a contoured edge configuration.
- the engagement portion 72 T of the two radially outwardly positioned displacement members 70 have a linear tapered edge; and the engagement portion 72 T′ of the radially inner most positioned displacement member 70 has an arcuate edge that is complementary in shape to the surface 52 F of the first leaf 52 .
- any of the displacement members 70 may employ an arcuate edge and/or a linear tapered edge.
- the second leg 72 has a length LN (e.g., L 7 shown in FIG. 6 , L 1 -L 10 shown in FIG. 5 ) extending between the first leg 71 and the engagement portion 72 T.
- LN e.g., L 7 shown in FIG. 6 , L 1 -L 10 shown in FIG. 5
- each of L 1 -L 10 are of a different magnitude and displace the leaf assembly 50 a different magnitude.
- the lengths L 1 -L 10 progressively increase (i.e., L 10 is greater than L 9 , L 9 is greater than L 8 , L 8 is greater than L 7 , L 7 is greater than L 6 , L 6 is greater than L 5 , L 5 is greater than L 4 , L 4 is greater than L 3 , L 3 is greater than L 2 , L 2 is greater than L 1 ).
- the displacement members 70 are arranged to establish a predefined contour of the leaf assembly 50 .
- the predetermined contour is configured to compensate for movement of the preheater 10 during operation.
- the first leaf 52 and the second leaf 54 have a trapezoidal shape.
- a pressure P 1 (shown on a left hand side of the leaf assembly 50 in FIG. 6 ) is present in the air outlet duct 28 of the air sector 32 of FIG. 1 ; and a pressure P 2 (shown on a right hand side of the leaf assembly in FIG. 6 ) is present in the flue gas inlet duct 22 of the gas sector 34 of FIG. 1 .
- the pressure P 1 is greater than the pressure P 2 , thereby creating a pressure differential ⁇ P across the seal assembly 140 .
- the differential pressure ⁇ P causes the leaf assembly 50 to deflect in the direction indicated by the arrow XX tending to open up a leakage gap between the distal end 52 D of the seal assembly 140 and the surface 31 of the sector plate 30 A′.
- the displacement members 70 apply a preload or predetermined deflection to the leaf assembly 50 so that the leaf assembly remains in a generally upright position with the distal end 52 D of the seal assembly 140 engaging the surface 31 of the sector plate 30 A′ and thereby overcoming the differential pressure ⁇ P induced deflection.
- a pressure P 1 ′ (shown on a right hand side of the leaf assembly 50 in FIG. 6 ) is present in the air outlet duct 28 of the air sector 32 of FIG. 1 ; and a pressure P 2 ′ (shown on a left hand side of the leaf assembly in FIG. 6 ) is present in the flue gas inlet duct 22 of the gas sector 34 of FIG. 1 .
- the pressure P 1 ′ is greater than the pressure P 2 ′ thereby creating a differential pressure ⁇ P′ across the leaf assembly 50 .
- the differential pressure ⁇ P′ tends to cause the leaf assembly 50 to deflect in the direction indicated by the arrow YY.
- the displacement members 70 hold the leaf assembly 50 in a predetermined position in which the distal end 52 D of the seal assembly 140 engages the surface 31 of the sector plate 30 A to minimize leakage between the air sector 32 and the gas sector 34 .
- the seal assembly 140 includes a strip 80 having fourth base section 80 B that engages the second base section 54 B of the second leaf 54 .
- the fourth base section 80 B defines a fourth fastening area, for example, a flat section and a bore extending therethrough for receiving one of the bolts 145 for securing the strip 80 to the diaphragm 18 of the preheater 10 of FIG. 1 .
- the second base section 54 B is positioned between the first base section 52 B and the fourth base section 80 B.
- the strip 80 defines a deflector section 80 L extending away from the fourth base section 80 B and away from the second leaf 54 .
- the deflector section 80 L terminates at a distal end 80 D.
- the strip 80 has a bend 80 Y so that the deflector section 80 L is set at an angle Q away from the second leaf 54 .
- the strip 80 has utility in protecting the leaf assembly 50 from potential obstructions such as soot blowing equipment projecting into the preheater 10 .
- the strip 80 is a limit stop for limiting the amount of deflection of the leaf assembly 50 .
- a bar 90 (e.g., a spacer bar, or elongate washer) is aligned with a portion of the first base section 52 B and the second base section 54 B.
- the bar 90 extends along a length of the leaf assembly 50 and is positioned between the nuts 146 and the diaphragm 18 .
- the bar 90 provides structural stability and helps uniformly secure the first leaf 52 , second leaf 54 and the strip 80 to the diaphragm 18 .
- the sector plate 31 defines a sharp leading edge 31 L and a sharp trailing edge 31 T.
- the leading edge 31 L is defined by an angle ⁇ 1 ; and the trailing edge 31 T is defined by an angle ⁇ 2 .
- the angle ⁇ 1 and/or the angle ⁇ 2 is about 90 degrees.
- the inventors have surprisingly discovered that as the seal assembly 50 rotates with the rotor assembly 12 , the first distal end 52 D of the first leaf 52 abruptly and scrapingly engages the leading edge 31 L in a scissor-like operation; and abruptly and scrapingly disengages the trailing edge 31 T in the scissor-like operation, which causes premature wear of the seal. Contrary to engineering intuition, the inventors have found that the wear is more prominent radially inward towards the rotor post 16 .
- the ramped configuration includes a ramped leading edge 31 L′ and a ramped trailing edge 31 T′.
- the ramped leading edge 31 L′ defines a ramp angle ⁇ 1
- the ramped trailing edge defines a ramp angle ⁇ 2 .
- the ramp angles ⁇ 1 and/or ⁇ 2 are between about 15 and 25 degrees relative to the surface 31 of the sector plate 30 A or 30 B.
- the ramp angles ⁇ 1 and/or 02 are between about 25 and 45 degrees relative to the surface 31 of the sector plate 30 A or 30 B.
- ramped leading edge 31 L′ and the ramped trailing edge 31 T′ is shown as a chamfer in the sector plate 30 A the present invention is not limited in this regard as similar configurations may be employed in the sector plate 30 B (or other sector plates in tri-sector and quad sector preheaters) and/or other ramp configurations may be employed such as but not limited to ramp attachments 131 L and 131 T secured to the sector plate 30 A and/or 30 B as shown in FIG. 8 .
- the ramp attachment 131 L has a leading surface 131 LA and a trailing surface 131 LB each oriented at a ramp angle ⁇ 1 relative to the surface 31 of the sector plate 30 A.
- the ramp attachment 131 T has a leading surface 131 TA and a trailing surface 131 TB each oriented at a ramp angle ⁇ 2 relative to the surface 31 of the sector plate 30 A.
- the ramp attachments 131 L and 131 T are secured to the sector plates 30 A and/or 30 B by a suitable fastening configuration such as but not limited to bolting and welding.
- the ramp attachments 131 L and 131 T are configured to be installed as original equipment as part of a new preheater installation or retrofitting of an existing preheater.
- the inventors have found that the ramped configuration having a 20 degree ramp angle results in a total wear rate of the seal assembly 50 of less than 0.0016 inches per hour at less than 30 percent load operation at locations along the seal assembly between 50 and 150 inches from the axis A; and less than 4 ⁇ 10 ⁇ 4 inches per hour at less than 30 percent load operation at locations along the seal assembly between radially outward of 150 inches from the axis A. While the wear rates are based upon laboratory testing, the inventors expect that they are a reasonable prediction of wear during operation.
Abstract
A seal assembly includes a leaf assembly and a supplemental leaf assembly. The leaf assembly includes a first leaf having a first base section. The first base section defines a first fastening area for securing the first leaf to a diaphragm of the preheater. The first leaf has a first elongate section extending away from the first base section and terminating at a first distal end thereof. The leaf assembly further includes a second leaf that engages a portion of the first leaf. The second leaf has a second base section. The second base section defines a second fastening area for securing the second leaf to the diaphragm. The second leaf has a second elongate section extending away from the second base section and terminating at a second distal end thereof. The supplemental leaf assembly is secured to the first leaf and slidingly engaging the second leaf.
Description
- This invention relates to a flexible seal for a rotary regenerative preheater, and more particularly to a flexible seal having multiple leafs.
- As shown in
FIG. 1 , a rotary regenerative air preheater (hereinafter referred to as the “preheater”) is generally designated by thenumeral 10. Thepreheater 10 includes arotor assembly 12 rotatably mounted on arotor post 16. Therotor assembly 12 is positioned in and rotates relative to ahousing 14. For example, therotor assembly 12 is rotatable about an axis A of therotor post 16 in the direction indicated by the arrow R. Therotor assembly 12 includes partitions 18 (e.g., diaphragms) extending radially from therotor post 16 to an outer periphery of therotor assembly 12. Adjacent pairs of thepartitions 18 definerespective compartments 20 for receiving aheat transfer assembly 1000. Each of theheat transfer assemblies 1000 include a plurality ofheat transfer sheets 100 and/or 200 stacked upon one another. - As shown in
FIG. 1 ,preheater 10 is a bisector configuration in which thehousing 14 includes a fluegas inlet duct 22 and a fluegas outlet duct 24 for channeling the flow of heated flue gases through thepreheater 10. Thehousing 14 further includes anair inlet duct 26 and anair outlet duct 28 for channeling the flow of combustion air through thepreheater 10. Thepreheater 10 includes anupper sector plate 30A extending across thehousing 14 adjacent to an upper face of therotor assembly 12. Thepreheater 10 includes alower sector plate 30B extending across thehousing 14 adjacent to lower face of therotor assembly 12. Theupper sector plate 30A extends between and is joined to the fluegas inlet duct 22 and theair outlet duct 28. Thelower sector plate 30B extends between and is joined to the fluegas outlet duct 24 and theair inlet duct 26. The upper andlower sector plates circumferential plate 30C. Theupper sector plate 30A and thelower sector plate 30B divide thepreheater 10 into anair sector 32 and agas sector 34. - As illustrated in
FIG. 1 , the arrows marked ‘A’ indicate the direction of aflue gas stream 36 through thegas sector 34 of therotor assembly 12. The arrows marked ‘B’ indicate the direction of acombustion air stream 38 through theair sector 32 of therotor assembly 12. Theflue gas stream 36 enters through the fluegas inlet duct 22 and transfers heat to theheat transfer assembly 1000 mounted in thecompartments 20. The heatedheat transfer assembly 1000 is rotated into theair sector 32 of thepreheater 10. Heat stored in theheat transfer assembly 1000 is then transferred to thecombustion air stream 38 entering through theair inlet duct 26. Thus, the heat absorbed from the hotflue gas stream 36 entering into thepreheater 10 is utilized for heating theheat transfer assemblies 1000, which in turn heats thecombustion air stream 38 entering thepreheater 10. - As shown in
FIG. 2 , aprior art seal 40 extends axially from (i.e., parallel to the axis A) and radially along an edge of each of thediaphragms 18 towards thesector plate 30A. Anotherseal 40 extends axially from and radially along an opposite side of each of thediaphragms 18 towards thesector plate 30B (only oneseal 40 shown inFIG. 1 ). Theseal 40 typically includes aflexible seal leaf 42 having abase portion 42B that is positioned between an L-shaped backing bar 43 and anelongate holding bar 41. Abase portion 41B of theholding bar 41, thebase portion 42B of theflexible seal 42 and abase portion 43B of thebacking bar 43 are secured by a plurality ofbolts 45 andnuts 46 between aspacer bar 44 and thediaphragm 18, radially along a length of thediaphragm 18. - During operation of the
preheater 10, asurface 31′ of thesector plates seal 40. However, during start-up conditions when thepreheater 10 andducts surface 31 of thesector plates respective seal 40. Such sliding engagement causes theflexible seal leaf 42 to wear and results in bypass leakage between theair sector 32 and thegas sector 34. In addition, through laboratory testing, the inventors have surprisingly found that such sliding engagement of theseal 40 with therespective sector plate seal 40, as indicated by the arrow V, causing fatigue failure thereof. In addition, the inventors have discovered that because theseal 40 is mounted on a leading edge of thediaphragm 18, the edge of thediaphragm 18 acts as anabrupt fulcrum 47 upon which theseal 40 is bent over and causes stress concentrations at the mating portion of theseal 40. Such stress concentrations cause premature failure of theseal 40. - There is disclosed herein a seal assembly for a rotary preheater. The seal assembly includes a leaf assembly and a supplemental leaf assembly. The leaf assembly includes a first leaf having a first base section. The first base section defines a first fastening area for securing the first leaf to a diaphragm of the preheater. The first leaf has a first elongate section extending away from the first base section and terminating at a first distal end thereof. The leaf assembly further includes a second leaf that engages a portion of the first leaf. The second leaf has a second base section. The second base section defines a second fastening area for securing the second leaf to the diaphragm. The second leaf has a second elongate section extending away from the second base section and terminating at a second distal end thereof. The supplemental leaf assembly is secured to the first leaf and slidingly engaging the second leaf.
- In one embodiment, the second distal end of the second leaf terminates between the first distal end and the first base section of the first leaf.
- In one embodiment, the supplemental leaf assembly includes a spacer secured to the first leaf and a third leaf secured to the spacer, for example by one or more rivets or spot welds. The third leaf slidingly engages the second leaf.
- In one embodiment, the second distal end of the second leaf terminates between the first distal end and the first base section; the supplemental leaf assembly includes a spacer secured to the first leaf and a third leaf secured to the spacer, the third leaf slidingly engages the second leaf; and the spacer is positioned between the first leaf and the third leaf, the spacer is spaced apart from the second distal end thereby defining a gap between the spacer and the second distal end to accommodate movement of the spacer relative to the second distal end.
- In one embodiment, the seal assembly includes a one or more displacement members. Each of the displacement members has a first engagement portion configured to displace a portion of the leaf assembly a predetermined distance. In one embodiment, the each of displacement members has an L-shaped configuration defining a first leg and a second leg. The first leg defines a third base portion that is secured to the diaphragm and the second leg has the engagement portion thereon. The displacement members are arranged to establish a predefined contour of the leaf assembly. The predetermined contour is configured to compensate for movement of the preheater during operation.
- In one embodiment, the seal assembly includes a strip (e.g., guard and/or limiter) having fourth base section engaging the second base section such that the second base section is positioned between the first base section and the fourth base section. The strip defines a deflector section extending away from the fourth base section and away from the second leaf.
- There is also disclosed herein a preheater assembly. The preheater assembly includes a rotor assembly rotatably mounted on a rotor post and disposed in a housing. The rotor assembly defines diaphragms extending radially from the rotor post to an outer periphery of the rotor assembly. Adjacent pairs of the diaphragms define respective compartments for receiving a heat transfer assembly. Each of the heat transfer assemblies include a plurality of heat transfer sheets stacked upon one another. The housing including a flue gas inlet duct and a flue gas outlet duct for channeling the flow of heated flue gases through the preheater The housing also includes an air inlet duct and an air outlet duct for channeling the flow of combustion air through the preheater. The preheater includes an upper sector plate extending across the housing adjacent to an upper face of the rotor assembly and a lower sector plate extending across the housing adjacent to lower face of the rotor assembly. The upper sector plate extends between and is joined to the flue gas inlet duct and the air outlet duct; and the lower sector plate extends between and is joined to the flue gas outlet duct and the air inlet duct. The upper and lower sector plates, respectively, are joined to one another by a circumferential plate. The upper sector plate and/or the lower sector plate define a leading edge and a trailing edge. One or more of the leading edge and the trailing edge defines a ramped configuration. A seal assembly is positioned on an axial edge of each diaphragm. The seal assembly includes a leaf assembly and a supplemental leaf assembly. The leaf assembly includes a first leaf having a first base section. The first base section defines a first fastening area for securing the first leaf to a diaphragm of the preheater. The first leaf has a first elongate section extending away from the first base section and terminating at a first distal end thereof. The leaf assembly further includes a second leaf that engages a portion of the first leaf. The second leaf has a second base section. The second base section defines a second fastening area for securing the second leaf to the diaphragm. The second leaf has a second elongate section extending away from the second base section and terminating at a second distal end thereof. The supplemental leaf assembly is secured to the first leaf and slidingly engages the second leaf. A portion of the first leaf slidingly engages the leading edge and disengages the trailing edge.
- In one embodiment, the second distal end terminates between the first distal end and the first base section.
- In one embodiment, the supplemental leaf assembly includes a spacer secured to the first leaf and a third leaf secured to the spacer. The third leaf slidingly engages the second leaf.
-
FIG. 1 is a perspective view of a preheater shown in a partial cut away view; -
FIG. 2 is a cross sectional view of a prior art seal secured to a diaphragm of a preheater; -
FIG. 3 is a plan view of the seal assembly of the present invention viewed from a trailing side of the diaphragm; -
FIG. 4 is a plan view of the seal assembly of the present invention viewed from a leading side of the diaphragm; -
FIG. 5 is a top view of the seal assembly ofFIG. 4 taken across line 5-5 ofFIG. 4 ; -
FIG. 6 is a cross sectional view of the seal assembly ofFIG. 3 taken across line 6-6 ofFIG. 4 ; -
FIG. 7 is another embodiment of the seal assembly ofFIG. 6 shown with a sector plate having a ramped configuration; -
FIG. 8 is another embodiment of the seal assembly ofFIG. 7 wherein the ramped configuration includes a ramp attachment secured to each of the leading and trailing edges of the sector plates; -
FIG. 9 is a cross sectional view of a portion of another embodiment of the seal assembly ofFIG. 6 and having one leaf extending outwardly from the other leaves; -
FIG. 10 is a cross sectional view of a portion of another embodiment of the seal assembly ofFIG. 6 wherein the spacer is formed by a bend in a first leaf; -
FIG. 11 is a cross sectional view of a portion of another embodiment of the seal assembly ofFIG. 6 wherein the spacer is formed by a rivets and spacer rings; and -
FIG. 12 is a cross sectional view of a portion of another embodiment of the seal assembly ofFIG. 6 wherein the spacer is formed by a bend in a second leaf. - As shown in
FIG. 6 , a seal assembly of the present invention is generally designated by the numeral 140. One of theseal assemblies 140 is secured to opposing axially edges of each of thediaphragms 18 of the bisector type preheater ofFIG. 1 by a suitable fastener system such as a plurality ofbolts 145 and nuts 146. However, other methods of fastening theseal assemblies 140 to thediaphragms 18 may be employed such as but not limited to welding and brazing. Each of theseal assemblies 140 are a generally elongate member that extends between therotor post 16 and a radially outward peripheral edge of thediaphragm 18, as shown inFIGS. 3 and 4 . While theseal assembly 140 is described as being employed in a bisector type preheater, the present invention is not limited in this regard as the seal assembly may be employed in a tri-sector or quad sector preheater, without departing from the broader aspects disclosed herein. - Referring to
FIG. 6 , each of theseal assemblies 140 includes aleaf assembly 50 having afirst leaf 52 having afirst base section 52B. Thefirst base section 52B defines a first fastening area, for example, a flat section and a bore extending therethrough for receiving one of thebolts 145 for securing thefirst leaf 52 to thediaphragm 18 of thepreheater 10 ofFIG. 1 . Thefirst leaf 52 has a firstelongate section 52L extending away from thefirst base section 52B and terminating at a firstdistal end 52D thereof. - Referring to
FIG. 6 , each of theseal assemblies 140 includes asecond leaf 54 engaging a portion of thefirst leaf 52 and having asecond base section 54B. Thesecond base section 54B defines a second fastening area, for example, a flat section and a bore extending therethrough for receiving one of thebolts 145 for securing thesecond leaf 54 to thediaphragm 18 of thepreheater 10 ofFIG. 1 . Thesecond leaf 54 has a secondelongate section 54L extending away from thesecond base section 54B and terminating at a seconddistal end 54D thereof. The seconddistal end 54D terminates along a length of thefirst leaf 52 between the firstdistal end 52D and thefirst base section 52B of thefirst leaf 52. - As shown in
FIG. 6 , each of theseal assemblies 140 includes asupplemental leaf assembly 60 secured to (e.g., viasuitable fastening structures 61 such as rivets or spot welds) thefirst leaf 52 and slidingly engages thesecond leaf 54. Thesupplemental leaf assembly 60 includes a spacer 62 (e.g., a spacer leaf) secured to (e.g., via the fastening structures 61) thefirst leaf 52. Thespacer 62 defines adistal end 62D. Thesupplemental leaf assembly 60 includes athird leaf 64 secured to (e.g., via the fastening structures 61) thespacer 62. Thethird leaf 64 slidingly engages a portion of thesecond leaf 54. Thethird leaf 64 defines a thirddistal end 64D. Thespacer 62 is positioned between thefirst leaf 52 and thethird leaf 64. Thespacer 62 is spaced apart from the seconddistal end 54D thereby defining a gap G between thespacer 62 and the seconddistal end 54D to accommodate movement of thespacer 62 relative to the seconddistal end 54D. While thespacer 62 is described and shown inFIG. 6 as being a leaf, the present invention is not limited in this regard as other spacer configurations may be employed including but not limited to: 1) aspacer 162L formed as a leg as a result of a bend 152D in thefirst leaf 152 as shown inFIG. 10 ; 2) a spacer ring 262B disposed around arivet 261 and positioned between thefirst leaf 252 and a third leaf 264 as shown inFIG. 11 ; and 3) aspacer 362L formed as a leg as a result of a bend 364D in thethird leaf 364 as shown inFIG. 12 . The inventors have surprisingly discovered that the sliding engagement of the sliding engagement of thethird leaf 64 with the portion of thesecond leaf 54 increases the performance and life of theseal assembly 140 by reducing vibrations compared to prior art single leaf seals or improvements with only two leaves. - As shown in
FIG. 6 , in one embodiment the distal ends 52D, 62D and 64D are aligned with one another. In the configuration shown inFIG. 6 , thedistal end 52D of thefirst leaf 52 is shown slidingly engaging thesurface 31 of thesector plate 30A during reduced (e.g., 30 percent load or less) or zero load operation. Another of thespacers 62 of aseal assembly 140, positioned on an opposite side of thediaphragm 18, slidingly engages thesurface 31 of thesector plate 30B. For loads greater than 30 percent thedistal end 54D is spaced apart from thesurface 31′ of thesector plate 30A by a gap G1 that reduces hot end radial seal gap by fifty percent at full load compared to the priorart seal assemblies 40. - While in
FIG. 6 the distal ends 52D, 62D and 64D are aligned with one another, the present invention is not limited in this regard as one or more of the distal ends 52D, 62D and 64D may extend outwardly from one another, as shown inFIG. 9 wherein thedistal end 62D extends outwardly from the distal ends 52D and 64D. In one embodiment portions of thespacer 62 on and adjacent to thedistal end 62 D are formed of a wear resistant configuration such as but not limited to a surface hardfacing weld overlay (e.g., a cobalt based weld material), a case hardened layer (e.g., nitriding, carburizing or other diffusion type hardening) and a precipitation hardened material. Thespacer 62 of slidingly engages thesurface 31 of thesector plate 30A. - In one embodiment, the
first leaf 52, thesecond leaf 54, thethird leaf 62 and/or thefourth leaf 64 are manufactured from an austenitic stainless steel, for example a 301 stainless steel. In one embodiment thefirst leaf 52, thesecond leaf 54, thethird leaf 62 and/or thefourth leaf 64 are about 0.02 to 0.025 inches thick. - As shown in
FIG. 4 , theseal assembly 140 includes threedisplacement members 70 havingside edges 70E that abut one another. While threedisplacement members 70 are shown the present invention is not limited in this regard as thedisplacement members 70 may be formed in one integral piece or any number of segments to facilitate installation. In one embodiment illustrated inFIG. 6 , each of the plurality ofdisplacement members 70 has an L-shaped configuration defining afirst leg 71 and asecond leg 72. The first leg defines athird base section 71B. Thethird base section 71B defines a third fastening area, for example, a flat section and a bore extending therethrough for receiving one of thebolts 145 for securing thedisplacement member 70 to thediaphragm 18 of thepreheater 10 ofFIG. 1 . - As shown in
FIG. 5 , each ofsecond legs 72 defines anengagement portion 72T configured to engage asurface 52F of thefirst leaf 52 and to displace a portion of the leaf assembly 50 a predetermined distance, as described further herein. Each of theengagement portions 72T have a contoured edge configuration. For example, theengagement portion 72T of the two radially outwardly positioneddisplacement members 70 have a linear tapered edge; and theengagement portion 72T′ of the radially inner mostpositioned displacement member 70 has an arcuate edge that is complementary in shape to thesurface 52F of thefirst leaf 52. However, any of thedisplacement members 70 may employ an arcuate edge and/or a linear tapered edge. - As shown in
FIG. 6 thesecond leg 72 has a length LN (e.g., L7 shown inFIG. 6 , L1-L10 shown inFIG. 5 ) extending between thefirst leg 71 and theengagement portion 72T. As shown inFIG. 5 each of L1-L10 are of a different magnitude and displace the leaf assembly 50 a different magnitude. For example, the lengths L1-L10 progressively increase (i.e., L10 is greater than L9, L9 is greater than L8, L8 is greater than L7, L7 is greater than L6, L6 is greater than L5, L5 is greater than L4, L4 is greater than L3, L3 is greater than L2, L2 is greater than L1). Thedisplacement members 70 are arranged to establish a predefined contour of theleaf assembly 50. The predetermined contour is configured to compensate for movement of thepreheater 10 during operation. As shown inFIG. 3 , thefirst leaf 52 and thesecond leaf 54 have a trapezoidal shape. - Referring to
FIG. 6 , when thedistal end 52D of theseal assembly 140 engages thesurface 31 of thesector plate 30A′ a pressure P1 (shown on a left hand side of theleaf assembly 50 inFIG. 6 ) is present in theair outlet duct 28 of theair sector 32 ofFIG. 1 ; and a pressure P2 (shown on a right hand side of the leaf assembly inFIG. 6 ) is present in the fluegas inlet duct 22 of thegas sector 34 ofFIG. 1 . The pressure P1 is greater than the pressure P2, thereby creating a pressure differential ΔP across theseal assembly 140. When theseal assembly 140 is in the area of thesector plate 30A′, without thedisplacement members 70 properly set, the differential pressure ΔP causes theleaf assembly 50 to deflect in the direction indicated by the arrow XX tending to open up a leakage gap between thedistal end 52D of theseal assembly 140 and thesurface 31 of thesector plate 30A′. However, thedisplacement members 70 apply a preload or predetermined deflection to theleaf assembly 50 so that the leaf assembly remains in a generally upright position with thedistal end 52D of theseal assembly 140 engaging thesurface 31 of thesector plate 30A′ and thereby overcoming the differential pressure ΔP induced deflection. - When the seal assembly rotates about 180 degrees into the area of the
sector plate 30A a pressure P1′ (shown on a right hand side of theleaf assembly 50 inFIG. 6 ) is present in theair outlet duct 28 of theair sector 32 ofFIG. 1 ; and a pressure P2′ (shown on a left hand side of the leaf assembly inFIG. 6 ) is present in the fluegas inlet duct 22 of thegas sector 34 ofFIG. 1 . The pressure P1′ is greater than the pressure P2′ thereby creating a differential pressure ΔP′ across theleaf assembly 50. When theseal assembly 140 is in the area of thesector plate 30A the differential pressure ΔP′ tends to cause theleaf assembly 50 to deflect in the direction indicated by the arrow YY. When theseal assembly 140 is in the area of thesector plate 30A thedisplacement members 70 hold theleaf assembly 50 in a predetermined position in which thedistal end 52D of theseal assembly 140 engages thesurface 31 of thesector plate 30A to minimize leakage between theair sector 32 and thegas sector 34. - As shown in
FIGS. 3 and 6 , theseal assembly 140 includes astrip 80 havingfourth base section 80B that engages thesecond base section 54B of thesecond leaf 54. Thefourth base section 80B defines a fourth fastening area, for example, a flat section and a bore extending therethrough for receiving one of thebolts 145 for securing thestrip 80 to thediaphragm 18 of thepreheater 10 ofFIG. 1 . Thesecond base section 54B is positioned between thefirst base section 52B and thefourth base section 80B. Thestrip 80 defines a deflector section 80L extending away from thefourth base section 80B and away from thesecond leaf 54. The deflector section 80L terminates at adistal end 80D. For example, thestrip 80 has abend 80Y so that the deflector section 80L is set at an angle Q away from thesecond leaf 54. Thestrip 80 has utility in protecting theleaf assembly 50 from potential obstructions such as soot blowing equipment projecting into thepreheater 10. In addition, thestrip 80 is a limit stop for limiting the amount of deflection of theleaf assembly 50. - As shown in
FIGS. 4 and 6 a bar 90 (e.g., a spacer bar, or elongate washer) is aligned with a portion of thefirst base section 52B and thesecond base section 54B. Thebar 90 extends along a length of theleaf assembly 50 and is positioned between the nuts 146 and thediaphragm 18. Thebar 90 provides structural stability and helps uniformly secure thefirst leaf 52,second leaf 54 and thestrip 80 to thediaphragm 18. - As shown in
FIG. 6 , thesector plate 31 defines a sharpleading edge 31L and a sharp trailing edge 31T. Theleading edge 31L is defined by an angle Ø1; and the trailing edge 31T is defined by an angle Ø2. In one embodiment, the angle Ø1 and/or the angle Ø2 is about 90 degrees. - Through analysis and experimentation, the inventors have surprisingly discovered that as the
seal assembly 50 rotates with therotor assembly 12, the firstdistal end 52D of thefirst leaf 52 abruptly and scrapingly engages theleading edge 31L in a scissor-like operation; and abruptly and scrapingly disengages the trailing edge 31T in the scissor-like operation, which causes premature wear of the seal. Contrary to engineering intuition, the inventors have found that the wear is more prominent radially inward towards therotor post 16. - As prompted by the results of the experimentation and testing, the inventors have modified the sharp
leading edge 31L and trailing edge 31T to a ramped configuration as shown inFIG. 7 . The ramped configuration includes a ramped leadingedge 31L′ and a ramped trailing edge 31T′. The rampedleading edge 31L′ defines a ramp angle θ1, and the ramped trailing edge defines a ramp angle θ2. In one embodiment the ramp angles θ1 and/or θ2 are between about 15 and 25 degrees relative to thesurface 31 of thesector plate surface 31 of thesector plate edge 31L′ and the ramped trailing edge 31T′ is shown as a chamfer in thesector plate 30A the present invention is not limited in this regard as similar configurations may be employed in thesector plate 30B (or other sector plates in tri-sector and quad sector preheaters) and/or other ramp configurations may be employed such as but not limited to rampattachments sector plate 30A and/or 30B as shown inFIG. 8 . As shown inFIG. 8 , theramp attachment 131L has a leading surface 131LA and a trailing surface 131LB each oriented at a ramp angle θ1 relative to thesurface 31 of thesector plate 30A. Likewise, theramp attachment 131T has a leading surface 131TA and a trailing surface 131TB each oriented at a ramp angle θ2 relative to thesurface 31 of thesector plate 30A. Theramp attachments sector plates 30A and/or 30B by a suitable fastening configuration such as but not limited to bolting and welding. Theramp attachments - As a resulted of laboratory test simulations of preheater operation, the inventors have found that the ramped configuration having a 20 degree ramp angle results in a total wear rate of the
seal assembly 50 of less than 0.0016 inches per hour at less than 30 percent load operation at locations along the seal assembly between 50 and 150 inches from the axis A; and less than 4×10−4 inches per hour at less than 30 percent load operation at locations along the seal assembly between radially outward of 150 inches from the axis A. While the wear rates are based upon laboratory testing, the inventors expect that they are a reasonable prediction of wear during operation. - Although this invention has been shown and described with respect to the detailed embodiments thereof, it will be understood by those of skill in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed in the above detailed description, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (15)
1. A seal assembly for a rotary preheater, the seal assembly comprising:
a leaf assembly comprising:
a first leaf having a first base section, the first base section defining a first fastening area for securing the first leaf to a diaphragm of the preheater, the first leaf having a first elongate section extending away from the first base section and terminating at a first distal end thereof;
a second leaf engaging a portion of the first leaf and having a second base section, the second base section defining a second fastening area for securing the second leaf to the diaphragm, the second leaf having a second elongate section extending away from the second base section and terminating at a second distal end thereof; and
a supplemental leaf assembly secured to the first leaf and slidingly engaging the second leaf.
2. The seal assembly of claim 1 , wherein the second distal end terminates between the first distal end and the first base section.
3. The seal assembly of claim 1 , wherein the supplemental leaf assembly comprises a spacer secured to the first leaf and a third leaf secured to the spacer, the third leaf slidingly engaging the second leaf.
4. The seal assembly of claim 1 , wherein:
the second distal end terminates between the first distal end and the first base section;
the supplemental leaf assembly comprises a spacer secured to the first leaf and a third leaf secured to the spacer, the third leaf slidingly engaging the second leaf; and
wherein the spacer is positioned between the first leaf and the third leaf, the spacer being spaced apart from the second distal end thereby defining a gap between the spacer and the second distal end to accommodate movement of the spacer relative to the second distal end.
5. The seal assembly of claim 1 , further comprising at least one displacement member, the at least one displacement member having a first engagement portion configured to displace a first portion of the leaf assembly a first distance and the at least one displacement member having a second engagement portion configured to displace a second portion of the leaf assembly a second distance, wherein the first distance and the second distance are different.
6. The seal assembly of claim 5 , wherein each of the at least one displacement member has an L-shaped configuration defining a first leg and a second leg, the first leg defining a third base portion that is configured to be secured to the diaphragm and the second leg comprising one of the first engagement portion and the second engagement portion.
7. The seal assembly of claim 5 , wherein the at least one displacement member is arranged to establish a predefined contour of the leaf assembly.
8. The seal assembly of claim 7 , wherein the predetermined contour is configured to compensate for movement of the preheater during operation.
9. The seal assembly of claim 3 , wherein the spacer protrudes outwardly from at least one of the first leaf and the second leaf.
10. The seal assembly of claim 1 , further comprising a strip having fourth base section engaging the second base section, the second base section being positioned between the first base section and the fourth base section and the strip defining a deflector section extending away from the fourth base section and away from the second leaf.
11. The seal assembly of claim 1 , further comprising a bar aligned with a portion of the first base section and the second base section.
12. The seal assembly of claim 3 , wherein the spacer comprises at least one of a hardened material, a weld, a rivet, a leaf and a bend in one of the first leaf and the third leaf.
13. A preheater assembly comprising:
a rotor assembly rotatably mounted on a rotor post and disposed in a housing, the rotor assembly defining diaphragms extending radially from the rotor post to an outer periphery of the rotor assembly, adjacent pairs of the diaphragms defining respective compartments for receiving a heat transfer assembly, each of the heat transfer assemblies including a plurality of heat transfer sheets stacked upon one another, the housing including a flue gas inlet duct and a flue gas outlet duct for channeling the flow of heated flue gases through the preheater, the housing including an air inlet duct and an air outlet duct for channeling the flow of combustion air through the preheater, the preheater including an upper sector plate extending across the housing adjacent to an upper face of the rotor assembly and a lower sector plate extending across the housing adjacent to lower face of the rotor assembly, the upper sector plate extends between and is joined to the flue gas inlet duct and the air outlet duct, the lower sector plate extends between and is joined to the flue gas outlet duct and the air inlet duct, the upper and lower sector plates, respectively, are joined to one another by a circumferential plate;
at least one of the upper sector plate and the lower sector plate defining a leading edge and a trailing edge, and wherein at least one of the leading edge and the trailing edge defines a ramped configuration; and
a seal assembly positioned on an axial edge of each diaphragm, the seal assembly comprising:
a leaf assembly comprising:
a first leaf having a first base section, the first base section defining a first fastening area for securing the first leaf to a diaphragm of the preheater, the first leaf having a first elongate section extending away from the first base section and terminating at a first distal end thereof;
a second leaf engaging a portion of the first leaf and having a second base section, the second base section defining a second fastening area for securing the second leaf to the diaphragm, the second leaf having a second elongate section extending away from the second base section and terminating at a second distal end thereof; and
a supplemental leaf assembly secured to the first leaf and slidingly engaging the second leaf; and
wherein a portion of the seal assembly engages the leading edge and disengages the trailing edge.
14. The preheater of claim 13 , wherein the second distal end terminates between the first distal end and the first base section.
15. The preheater of claim 13 , wherein the supplemental leaf assembly comprises a spacer secured to the first leaf and a third leaf secured to the spacer, the third leaf slidingly engaging the second leaf.
Priority Applications (23)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/829,210 US20170051983A1 (en) | 2015-08-18 | 2015-08-18 | Flexible seal for a rotary regenerative preheater |
CN202010547862.1A CN111895443B (en) | 2015-08-18 | 2016-08-17 | Flexible seal for rotary regenerative preheater |
AU2016308724A AU2016308724B2 (en) | 2015-08-18 | 2016-08-17 | Flexible seal for a rotary regenerative preheater |
PL19173130T PL3540353T3 (en) | 2015-08-18 | 2016-08-17 | Flexible seal for a rotary regenerative preheater |
ES16757795T ES2746981T3 (en) | 2015-08-18 | 2016-08-17 | Flexible gasket for a rotary regenerative preheater |
EP19173130.6A EP3540353B1 (en) | 2015-08-18 | 2016-08-17 | Flexible seal for a rotary regenerative preheater |
CN201680048256.7A CN108027219B (en) | 2015-08-18 | 2016-08-17 | Flexible seal for rotary regenerative preheater |
KR1020187006244A KR20180043795A (en) | 2015-08-18 | 2016-08-17 | Flexible sealant for rotary regeneration preheater |
EP16757795.6A EP3338044B1 (en) | 2015-08-18 | 2016-08-17 | Flexible seal for a rotary regenerative preheater |
JP2018509818A JP6889152B2 (en) | 2015-08-18 | 2016-08-17 | Flexible seal for rotary regenerative preheater |
US15/753,018 US10295273B2 (en) | 2015-08-18 | 2016-08-17 | Flexible seal for a rotary regenerative preheater |
PL16757795T PL3338044T3 (en) | 2015-08-18 | 2016-08-17 | Flexible seal for a rotary regenerative preheater |
CN201620896703.1U CN205897935U (en) | 2015-08-18 | 2016-08-17 | A pre -heater subassembly for rotating seal assembly of pre -heater and relevant |
MYPI2018700561A MY193682A (en) | 2015-08-18 | 2016-08-17 | Flexible seal for a rotary regenerative preheater |
PCT/US2016/047318 WO2017031191A1 (en) | 2015-08-18 | 2016-08-17 | Flexible seal for a rotary regenerative preheater |
KR1020197006078A KR20190039736A (en) | 2015-08-18 | 2017-02-10 | Flexible sealing of rotary regeneration preheater |
AU2017313655A AU2017313655B2 (en) | 2015-08-18 | 2017-02-10 | Flexible seal for a rotary regenerative preheater |
CN201780050528.1A CN109642775B (en) | 2015-08-18 | 2017-02-10 | Flexible seal for rotary regenerative preheater |
JP2019508230A JP6912035B2 (en) | 2015-08-18 | 2017-02-10 | Flexible seal for rotary regenerative preheater |
MYPI2019000718A MY195010A (en) | 2015-08-18 | 2017-02-10 | Flexible seal for a rotary regenerative preheater |
ES17705773T ES2812262T3 (en) | 2015-08-18 | 2017-02-10 | Flexible gasket for a rotary regenerative preheater |
SA518390921A SA518390921B1 (en) | 2015-08-18 | 2018-02-13 | Flexible seal for a rotary regenerative preheater |
US16/395,766 US11333446B2 (en) | 2015-08-18 | 2019-04-26 | Flexible seal for a rotary regenerative preheater |
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US14/829,210 US20170051983A1 (en) | 2015-08-18 | 2015-08-18 | Flexible seal for a rotary regenerative preheater |
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Application Number | Title | Priority Date | Filing Date |
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PCT/US2016/047318 Continuation WO2017031191A1 (en) | 2015-08-18 | 2016-08-17 | Flexible seal for a rotary regenerative preheater |
US15/753,018 Continuation US10295273B2 (en) | 2015-08-18 | 2016-08-17 | Flexible seal for a rotary regenerative preheater |
US15/753,018 Continuation-In-Part US10295273B2 (en) | 2015-08-18 | 2016-08-17 | Flexible seal for a rotary regenerative preheater |
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US16/395,766 Active US11333446B2 (en) | 2015-08-18 | 2019-04-26 | Flexible seal for a rotary regenerative preheater |
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US16/395,766 Active US11333446B2 (en) | 2015-08-18 | 2019-04-26 | Flexible seal for a rotary regenerative preheater |
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US (2) | US20170051983A1 (en) |
EP (2) | EP3338044B1 (en) |
JP (2) | JP6889152B2 (en) |
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CN (4) | CN205897935U (en) |
AU (2) | AU2016308724B2 (en) |
ES (2) | ES2746981T3 (en) |
MY (2) | MY193682A (en) |
PL (2) | PL3338044T3 (en) |
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Cited By (2)
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US10295273B2 (en) * | 2015-08-18 | 2019-05-21 | Arvos Ljungstrom Llc | Flexible seal for a rotary regenerative preheater |
US11333446B2 (en) * | 2015-08-18 | 2022-05-17 | Arvos Ljungstrom Llc | Flexible seal for a rotary regenerative preheater |
Families Citing this family (1)
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CN115836187A (en) * | 2020-05-13 | 2023-03-21 | 豪顿集团有限公司 | Parabolic deformed sector plate |
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2016
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- 2016-08-17 CN CN201620896703.1U patent/CN205897935U/en not_active Expired - Fee Related
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- 2016-08-17 KR KR1020187006244A patent/KR20180043795A/en unknown
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- 2018-02-13 SA SA518390921A patent/SA518390921B1/en unknown
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US10295273B2 (en) * | 2015-08-18 | 2019-05-21 | Arvos Ljungstrom Llc | Flexible seal for a rotary regenerative preheater |
US11333446B2 (en) * | 2015-08-18 | 2022-05-17 | Arvos Ljungstrom Llc | Flexible seal for a rotary regenerative preheater |
Also Published As
Publication number | Publication date |
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AU2016308724B2 (en) | 2022-06-09 |
EP3540353B1 (en) | 2020-10-28 |
KR20190039736A (en) | 2019-04-15 |
EP3338044B1 (en) | 2019-06-26 |
PL3338044T3 (en) | 2019-12-31 |
JP2019526772A (en) | 2019-09-19 |
JP2018523808A (en) | 2018-08-23 |
KR20180043795A (en) | 2018-04-30 |
PL3540353T3 (en) | 2021-05-04 |
CN108027219B (en) | 2020-07-10 |
US20190249930A1 (en) | 2019-08-15 |
US11333446B2 (en) | 2022-05-17 |
EP3540353A1 (en) | 2019-09-18 |
MY195010A (en) | 2022-12-30 |
WO2017031191A1 (en) | 2017-02-23 |
CN108027219A (en) | 2018-05-11 |
EP3338044A1 (en) | 2018-06-27 |
AU2016308724A1 (en) | 2018-03-29 |
CN111895443B (en) | 2023-03-21 |
CN111895443A (en) | 2020-11-06 |
MY193682A (en) | 2022-10-25 |
ES2812262T3 (en) | 2021-03-16 |
JP6912035B2 (en) | 2021-07-28 |
CN109642775B (en) | 2020-12-08 |
JP6889152B2 (en) | 2021-06-18 |
ES2746981T3 (en) | 2020-03-09 |
CN109642775A (en) | 2019-04-16 |
AU2017313655A1 (en) | 2019-03-21 |
AU2017313655B2 (en) | 2022-04-28 |
CN205897935U (en) | 2017-01-18 |
SA518390921B1 (en) | 2021-10-06 |
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Owner name: ARVOS INC., NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:O'BOYLE, JEFFREY;REEL/FRAME:036567/0709 Effective date: 20150821 |
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