US20170051983A1 - Flexible seal for a rotary regenerative preheater - Google Patents

Flexible seal for a rotary regenerative preheater Download PDF

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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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US
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
Application number
US14/829,210
Other languages
English (en)
Inventor
Jeffrey O'Boyle
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.)
Arvos Ljungstroem LLC
Original Assignee
Arvos Inc
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 Arvos Inc filed Critical Arvos Inc
Priority to US14/829,210 priority Critical patent/US20170051983A1/en
Assigned to ARVOS INC. reassignment ARVOS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: O'BOYLE, Jeffrey
Priority to EP16757795.6A priority patent/EP3338044B1/en
Priority to ES16757795T priority patent/ES2746981T3/es
Priority to CN201620896703.1U priority patent/CN205897935U/zh
Priority to CN201680048256.7A priority patent/CN108027219B/zh
Priority to PL16757795T priority patent/PL3338044T3/pl
Priority to PL19173130T priority patent/PL3540353T3/pl
Priority to PCT/US2016/047318 priority patent/WO2017031191A1/en
Priority to KR1020187006244A priority patent/KR20180043795A/ko
Priority to MYPI2018700561A priority patent/MY193682A/en
Priority to CN202010547862.1A priority patent/CN111895443B/zh
Priority to JP2018509818A priority patent/JP6889152B2/ja
Priority to US15/753,018 priority patent/US10295273B2/en
Priority to AU2016308724A priority patent/AU2016308724B2/en
Priority to EP19173130.6A priority patent/EP3540353B1/en
Priority to CN201780050528.1A priority patent/CN109642775B/zh
Priority to ES17705773T priority patent/ES2812262T3/es
Priority to KR1020197006078A priority patent/KR20190039736A/ko
Priority to MYPI2019000718A priority patent/MY195010A/en
Priority to AU2017313655A priority patent/AU2017313655B2/en
Priority to JP2019508230A priority patent/JP6912035B2/ja
Publication of US20170051983A1 publication Critical patent/US20170051983A1/en
Priority to SA518390921A priority patent/SA518390921B1/ar
Priority to US16/395,766 priority patent/US11333446B2/en
Abandoned legal-status Critical Current

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Classifications

    • 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.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Supply (AREA)
  • Sealing Devices (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
US14/829,210 2015-08-18 2015-08-18 Flexible seal for a rotary regenerative preheater Abandoned US20170051983A1 (en)

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
EP19173130.6A EP3540353B1 (en) 2015-08-18 2016-08-17 Flexible seal for a rotary regenerative preheater
CN202010547862.1A CN111895443B (zh) 2015-08-18 2016-08-17 用于旋转再生式预热器的柔性密封件
US15/753,018 US10295273B2 (en) 2015-08-18 2016-08-17 Flexible seal for a rotary regenerative preheater
CN201620896703.1U CN205897935U (zh) 2015-08-18 2016-08-17 用于旋转预热器的密封组件以及相关的预热器组件
CN201680048256.7A CN108027219B (zh) 2015-08-18 2016-08-17 用于旋转再生式预热器的柔性密封件
PL16757795T PL3338044T3 (pl) 2015-08-18 2016-08-17 Elastyczna uszczelka dla obrotowego regeneracyjnego podgrzewacza wstępnego
PL19173130T PL3540353T3 (pl) 2015-08-18 2016-08-17 Elastyczna uszczelka do obrotowego regeneracyjnego podgrzewacza wstępnego
PCT/US2016/047318 WO2017031191A1 (en) 2015-08-18 2016-08-17 Flexible seal for a rotary regenerative preheater
KR1020187006244A KR20180043795A (ko) 2015-08-18 2016-08-17 회전식 재생 예열기를 위한 유연성 밀봉재
MYPI2018700561A MY193682A (en) 2015-08-18 2016-08-17 Flexible seal for a rotary regenerative preheater
EP16757795.6A EP3338044B1 (en) 2015-08-18 2016-08-17 Flexible seal for a rotary regenerative preheater
JP2018509818A JP6889152B2 (ja) 2015-08-18 2016-08-17 回転再生式予熱器のための可撓性シール
ES16757795T ES2746981T3 (es) 2015-08-18 2016-08-17 Junta flexible para un precalentador regenerativo rotativo
AU2016308724A AU2016308724B2 (en) 2015-08-18 2016-08-17 Flexible seal for a rotary regenerative preheater
JP2019508230A JP6912035B2 (ja) 2015-08-18 2017-02-10 回転再生式予熱器のための可撓性シール
CN201780050528.1A CN109642775B (zh) 2015-08-18 2017-02-10 用于旋转再生式预热器的柔性密封件
ES17705773T ES2812262T3 (es) 2015-08-18 2017-02-10 Junta de estanqueidad flexible para un precalentador regenerativo rotativo
KR1020197006078A KR20190039736A (ko) 2015-08-18 2017-02-10 로터리 재생 예열기의 유연성 밀봉
MYPI2019000718A MY195010A (en) 2015-08-18 2017-02-10 Flexible seal for a rotary regenerative preheater
AU2017313655A AU2017313655B2 (en) 2015-08-18 2017-02-10 Flexible seal for a rotary regenerative preheater
SA518390921A SA518390921B1 (ar) 2015-08-18 2018-02-13 مانع تسريب مرن لسخان قبلي متجدد دوار
US16/395,766 US11333446B2 (en) 2015-08-18 2019-04-26 Flexible seal for a rotary regenerative preheater

Applications Claiming Priority (1)

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

Related Child Applications (3)

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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
PCT/US2016/047318 Continuation WO2017031191A1 (en) 2015-08-18 2016-08-17 Flexible seal for a rotary regenerative preheater

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US20170051983A1 true US20170051983A1 (en) 2017-02-23

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US14/829,210 Abandoned US20170051983A1 (en) 2015-08-18 2015-08-18 Flexible seal for a rotary regenerative preheater
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 (es)
EP (2) EP3338044B1 (es)
JP (2) JP6889152B2 (es)
KR (2) KR20180043795A (es)
CN (4) CN111895443B (es)
AU (2) AU2016308724B2 (es)
ES (2) ES2746981T3 (es)
MY (2) MY193682A (es)
PL (2) PL3540353T3 (es)
SA (1) SA518390921B1 (es)
WO (1) WO2017031191A1 (es)

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US11333446B2 (en) * 2015-08-18 2022-05-17 Arvos Ljungstrom Llc Flexible seal for a rotary regenerative preheater
US12007174B2 (en) 2020-05-13 2024-06-11 Howden Group Limited Parabolically deforming sector plate

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US11333446B2 (en) * 2015-08-18 2022-05-17 Arvos Ljungstrom Llc Flexible seal for a rotary regenerative preheater
US12007174B2 (en) 2020-05-13 2024-06-11 Howden Group Limited Parabolically deforming sector plate

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KR20180043795A (ko) 2018-04-30
MY193682A (en) 2022-10-25
JP6912035B2 (ja) 2021-07-28
ES2812262T3 (es) 2021-03-16
CN109642775A (zh) 2019-04-16
CN109642775B (zh) 2020-12-08
US11333446B2 (en) 2022-05-17
AU2016308724A1 (en) 2018-03-29
MY195010A (en) 2022-12-30
JP2018523808A (ja) 2018-08-23
EP3540353A1 (en) 2019-09-18
ES2746981T3 (es) 2020-03-09
SA518390921B1 (ar) 2021-10-06
EP3540353B1 (en) 2020-10-28
WO2017031191A1 (en) 2017-02-23
AU2016308724B2 (en) 2022-06-09
PL3540353T3 (pl) 2021-05-04
CN108027219B (zh) 2020-07-10
KR20190039736A (ko) 2019-04-15
CN111895443A (zh) 2020-11-06
CN108027219A (zh) 2018-05-11
AU2017313655A1 (en) 2019-03-21
CN111895443B (zh) 2023-03-21
JP6889152B2 (ja) 2021-06-18
CN205897935U (zh) 2017-01-18
EP3338044B1 (en) 2019-06-26
US20190249930A1 (en) 2019-08-15
JP2019526772A (ja) 2019-09-19
PL3338044T3 (pl) 2019-12-31
EP3338044A1 (en) 2018-06-27
AU2017313655B2 (en) 2022-04-28

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