| Patent Number |
Title Of Patent |
Date Issued |
| 6279647 |
Method and device for sensing a clearance |
August 28, 2001 |
| A method and an arrangement for sensing the clearance between an object and an object-adjacent surface, which is particularly for use in difficult ambient conditions, such as in dirty, corrosive environments and under varying temperature and pressure conditions, e.g. to measure and hold |
| 6260607 |
Air preheater sector plate drive |
July 17, 2001 |
| Drive means are provided to move the sector plates of rotary regenerative air preheaters into sealing position with the radial seals on the rotor during rotor turndown. A pair of fluid drive cylinders are connected to a pair of drive chains which rotate a drive shaft. One of the pair of |
| 6260606 |
Rotor construction for air preheater |
July 17, 2001 |
| The rotor of an existing rotary regenerative air preheater is retrofitted with deeper cold end baskets for general performance enhancement and/or for the tolerance of ammonium bisulfate deposits. the normal cold end support gratings are removed and the support of the cold end baskets of |
| 6227150 |
Load based control system for active leakage control in air preheater |
May 8, 2001 |
| A rotary air preheater has a rotor, at least one seal disposed proximate to the rotor, a drive for reciprocally driving a portion of the seal between a first position adjacent the rotor and a second position spaced from the first position, and a control system for activating the drive. T |
| 6179276 |
Heat and mass transfer element assembly |
January 30, 2001 |
| A heat transfer assembly for a rotary regenerative air preheater has heat transfer plates which include means for spacing the plates apart to form flow passages and a plurality of rows of V-shaped ribs extending across the flow passages. Alternate rows of V-shaped ribs on each plate prot |
| 6170117 |
Multiple rake sootblower with internal valving manifold |
January 9, 2001 |
| A multiple rake sootblower reciprocates over an area to clean an entire surface using a minimum of space for the sootblower stroke. An internal valving manifold and a plurality of bushings inside of a plenum isolate the rakes from each other and operate one rake at a time. This maintains |
| 6155209 |
Air preheater sector plate design with centered sealing arrangements |
December 5, 2000 |
| A sector plate static sealing arrangement for a rotary regenerative air preheater employs a single rib attached to and extending along the center line of the sector plate toward the air preheater casing. The rib cooperates with a static seal attached to the casing to provide both the |
| 6119764 |
Device of a rotary regenerative heat exchanger |
September 19, 2000 |
| A regenerative, rotary heat exchanger includes a stationary housing; a rotatable rotor in the housing; radially extending partition walls in the rotor separating the rotor into sectors; and a regeneratable mass in the sectors. Axially adjustable sector plates are located in sealing relat |
| 6068045 |
Rotor construction for air preheater |
May 30, 2000 |
| The support grating system for the heat exchange baskets of a rotary regenerative air preheater is arranged to be able to make full use of the rotor volume for the heat absorbent material. Support gratings can be located inside of the volume of the rotor enclosed by the pin rack asse |
| 6065528 |
Air preheater cleaner |
May 23, 2000 |
| A swing-arm sootblower for a rotary regenerative air preheater is mounted to sweep across the air preheater rotor at an adjustable constant speed or angular velocity. The sootblower has means for sootblowing with a relatively low pressure medium such as air or steam or with high pressure |
| 6035926 |
Rotary, regenerative heat exchanger having hydraulic motor motion |
March 14, 2000 |
| A rotary, regenerative heat exchanger includes an inner cylindrical hub (2) provided in a vertical position, a rotor (1) containing a heat exchange medium, first attachment members (30) for attaching the rotor to the hub, and a stationary casing (6) surrounding the rotor. A bearing (3) i |
| 6019160 |
Heat transfer element assembly |
February 1, 2000 |
| The thermal performance of the heat transfer element assemblies for rotary regenerative air preheaters is optimized to provide a desired level of heat transfer and pressure drop with a reduced volume and weight. The heat transfer plates in the assemblies have notches for maintaining plat |
| 5983985 |
Air preheater heat transfer elements and method of manufacture |
November 16, 1999 |
| Heat transfer elements for rotary regenerative heat exchangers are formed with spacing ridges or notches having flow-disrupting indentations in the peaks of the notches formed at selected intervals to project into the flow channels. These projections interrupt the boundary layer and caus |
| 5979050 |
Air preheater heat transfer elements and method of manufacture |
November 9, 1999 |
| Heat transfer elements for rotary regenerative heat exchangers are formed with spacing ridges or notches having flow-disrupting indentations in the peaks of the notches formed at selected intervals to project into the flow channels. These projections interrupt the boundary layer and caus |
| 5915340 |
Variable sector plate quad sector air preheater |
June 29, 1999 |
| A sealing arrangement for a quad sector rotary regenerative air preheater has a rotor rotatably mounted in a housing. The rotor has radially extending diaphragms forming compartments and radial seals extending along the edges of the diaphragms. Sector plates are positioned at the axial |
| 5915339 |
Sector plate and seal arrangement for trisector air preheater |
June 29, 1999 |
| A trisector air preheater includes sector plates between the primary air sector and the flue gas sector and between the secondary air sector and the flue gas sector which are of a large size so as to provide double radial seals. However, the sector plate between the primary and secondary |
| 5913359 |
Bypass seals for rotary regenerative heat exchangers |
June 22, 1999 |
| A heating element basket assembly for a rotary regenerative air preheater has a picture-frame structure with the open areas on each side being covered by a flat plate attached to the inside of the frame. A sealing plate member is attached to the outside of each of the flat plates within |
| 5911271 |
Floating bypass seal for rotary regenerative heat exchangers |
June 15, 1999 |
| The gas flow bypass around the heating elements in a regenerative air preheater is reduced by the use of floating bypass seals which are placed in the rotor compartments between stacked heating elements. The seals comprise a frame with an open center with the peripheral frame portion |
| 5909767 |
Recuperative cross flow plate-type heat exchanger |
June 8, 1999 |
| Adjoining heat exchange modules of a recuperative cross flow plate-type heat exchanger are joined into a single unit by means of common plate spacer bars. Each common spacer bar extends between and into the adjacent modules. The prior art mid-module gaps are eliminated. |
| 5899261 |
Air preheater heat transfer surface |
May 4, 1999 |
| A heat exchange element for an air preheater has first and second heat transfer elements arranged to form channels for the passage of a heat exchange media having a main flow direction. Each of the heat exchange plates has parallel straight ridges and flats between the ridges. The ri |
| 5893406 |
Regenerative heat exchanger |
April 13, 1999 |
| Modular heat exchange baskets for rotary regenerative air preheaters have radially extending tie bars which are positioned at each of the top and bottom side edges of the basket and which tie together the inboard and outboard end frames. These tie bars are located inside of the side edge |
| 5836379 |
Air preheater heat transfer surface |
November 17, 1998 |
| A heat transfer element for a rotary regenerative preheater has first and second heat transfer plates. The first heat transfer plate defines a plurality of generally equidistantly laterally spaced apart parallel straight notches. Each notch has adjacent double ridges extending transv |
| 5836378 |
Air preheater adjustable basket sealing system |
November 17, 1998 |
| The rotor for a rotary regenerative air preheater is fabricated from upper and lower rotor shell segments and hot-end and cold-end heat exchange baskets having closed outboard ends, the rotor shell segments and heat exchange baskets defining a first gap between the upper rotor shell |
| 5826642 |
Rotary regenerative heat exchanger |
October 27, 1998 |
| The heat exchange baskets for a rotary regenerative air preheater are loaded radially into the rotor rather than axially from the duct end. The rotor is divided into sectors by diaphragms, and support gratings are provided in each rotor sector with the baskets being positioned and su |
| 5820328 |
Integrated system for removal and replacement of basketed material within duct work or air prehe |
October 13, 1998 |
| A system for removing and replacing heat exchange baskets for radially loaded air preheaters. The system includes a platform having a horizontal upper surface for supporting the heat exchange baskets. The upper surface is substantially alignable with each basket support level such that a |
| 5803158 |
Air preheater heat transfer surface |
September 8, 1998 |
| An air preheater has heat transfer elements with a first series of corrugated elements having longitudinally oriented, mutually parallel corrugations formed generally continuously across the lateral direction. Positioned on either side of each of the corrugated elements of the first |
| 5803157 |
Semi-modular pinrack seal |
September 8, 1998 |
| A rotary regenerative air preheater has pinrack seals including a U-seal located between the upper and lower pinrack rails and a trough-shaped filler-seal located between the upper and lower pinrack supports of adjacent pinrack assemblies. The inboard edges of the wing portions of the |
| 5791400 |
Linear scan hot spot detection system |
August 11, 1998 |
| A hot spot detection system for a rotary regenerative preheater has a linear rail system positionable between the central portion and the casing of the air preheater. The rail assembly has a pair of rails with a carriage movably mounted to each rail. The drive assembly has a motor and |
| 5775405 |
Air preheater basket assembly |
July 7, 1998 |
| A rotary regenerative air preheater has a heat exchange basket assembly comprising one keystone heat exchange basket disposed between two lateral heat exchange baskets in each outboard sector compartment. The baskets have a trapezoidal shape such that the parallel sides of the keystone h |
| 5762128 |
On-line regenerative air preheater fouling sensing system |
June 9, 1998 |
| A fouling sensing system monitors fouling of a rotary regenerative preheater having a housing and a rotor rotatably mounted therein. An emitter for emitting energy is positioned at one of the faces of the rotor and emits energy through the rotor. A sensor is positioned at the other f |
| 5740856 |
Rotary regenerative heat exchanger with multiple layer baskets |
April 21, 1998 |
| The modular heat exchange baskets for a rotary regenerative air preheater which normally have a single stacked array of heat exchange plates, are constructed with heat exchange plate support bars intermediate the top and bottom surface. The basket then has two separate stacked arrays of |
| 5738711 |
Deflector and screen arrangement for ash separation from flue gas and method thereof |
April 14, 1998 |
| An apparatus for the separation of ash from a flue gas stream has a hopper defining a flow chamber for the flue gas stream. The hopper has an upper portion and a lower portion. The upper portion defines a horizontal flue gas inlet opening and a vertical flue gas outlet opening. The lower |
| 5727617 |
Plate stabilizer assembly for rotary regenerative air preheaters |
March 17, 1998 |
| An arrangement is provided in an air preheater for mounting and adjusting the sector plates and the axial seal plates in relation to the rotor using one adjustable mounting means and a stabilizer assembly. The stabilizer assembly includes a stabilizer beam which is fixedly mounted to the |
| 5713411 |
Means for lifting heat transfer element baskets |
February 3, 1998 |
| A lifting device for engaging lifting openings in a splitter plate of a heat transfer element basket assembly has first and second opposed hook bodies. Each hook body has an upper engagement portion and a lower portion offset from the upper portion. The hook bodies further define hook |
| 5697619 |
Radial seal for air preheaters |
December 16, 1997 |
| A rotary regenerative air preheater having a rotor mounted to a central rotor post for rotation within a surrounding housing whereby heat absorbent material carried in the rotor is alternately exposed to a flow of heating gas and a gas to be heated. A radial seal assembly including a |
| 5664942 |
Regenerative thermal oxidizer |
September 9, 1997 |
| A single bed thermal oxidizer for oxidizing a contaminate in a gas (air) stream has a plenum above the bed containing burners for gaseous fuel and means for injecting excess air. The burners are activated to initially heat the adjacent top bed portion. The burners are then turned off and |
| 5664621 |
Pre-stressed membrane basket cover assembly |
September 9, 1997 |
| A rotary regenerative air preheater has heat exchange baskets which contain the mass of heat absorbent material commonly comprised of stacked plate-like elements. The heat exchange basket comprises a frame which is open on each end and which is closed on the sides by basket cover ass |
| 5664620 |
Rotary regenerative heat exchanger |
September 9, 1997 |
| The rotor of a rotary regenerative air preheater is constructed for the loading of the heat exchange basket modules into the sectors of the rotor in a radial direction through the periphery of the rotor. The heat exchange basket modules are arranged in a plurality of axially spaced l |
| 5660226 |
Rotor post with floating tensile header |
August 26, 1997 |
| A rotary regenerative air preheater having a rotor mounted to a central rotor post for rotation within a surrounding housing whereby heat absorbent material carried in the rotor is alternately exposed to a flow of heating gas and a gas to be heated. Upper and lower rotor post headers |
| 5655594 |
Rotary regenerative heat exchanger |
August 12, 1997 |
| The connecting plate duct assemblies which form the inlet and outlet ducts for a rotary regenerative air preheater have a horizontal flange plate around the periphery. The vertical panels which house the rotor sit on the lower horizontal flange plate and are attached to lower vertical |
| 5649781 |
Linkage mechanism between structural members |
July 22, 1997 |
| A connecting linkage is provided between two structural members which includes a pinned connection to allow rotation of one structural member with respect to the other and which permits adjustment and alignment before locking the device in position without the need for drilling a pre |
| 5628360 |
Adjustable axial seal plates for rotary regenerative air preheaters |
May 13, 1997 |
| An arrangement is provided in an air preheater for mounting and adjusting the axial seal plates in relation to the rotor using a reduced number of adjustable mountings and replacing the remaining adjustable mountings with adjustable compression stops. These adjustable compression stops e |
| 5626184 |
Sootblower |
May 6, 1997 |
| A swing-arm sootblower for a rotary regenerative air preheater is mounted to sweep across the air preheater rotor at a constant speed or angular velocity. A constant speed motor is attached through a speed reducer to a drive sprocket. A chain drive turns driven sprocket which is connecte |
| 5540274 |
Rotary regenerative heat exchanger |
July 30, 1996 |
| A rotary regenerative air preheater has bypass seals located at the top and bottom of one side of each sector of heat exchange baskets located at the top and bottom of the adjacent diaphragm and sealing the gap between that one side of the baskets and the diaphragm. The bypass seals are |
| 5535813 |
Offset support-pedestal housing panel |
July 16, 1996 |
| In an air preheater with a large lower cold end center section and a smaller, upper hot end center section, the connecting plate duct assemblies on both the hot and cold end are made the same height rather than to have cold end connecting plate duct assemblies which are larger and eq |
| 5513695 |
Support of incompressible heat transfer surface in rotary regenerative air preheaters |
May 7, 1996 |
| Incompressible ceramic heat exchange blocks which may be catalyst coated having gas flow channels therethrough or other incompressible heat exchange surface are supported in a metal framework to form a removable basket for a rotary regenerative air heater. Between selected rows of the |
| 5485877 |
Rotary regenerative heat exchanger |
January 23, 1996 |
| The heat exchange baskets for a rotary regenerative air preheater are loaded radially into the rotor rather than axially from the duct end. The rotor is divided into sectors by diaphragms, and support gratings are provided in each rotor sector with the baskets being positioned and su |
| 5456310 |
Rotary regenerative heat exchanger |
October 10, 1995 |
| A rotary regenerative air preheater has a rotor which is divided into sectors by diaphragm plates. Mounted between these diaphragms are support gratings which support the heat exchange baskets with there being at least two circumferentially adjacent full-wrapper baskets on each support |
| 5454418 |
Means for lifting heat transfer element baskets |
October 3, 1995 |
| A heat transfer element basket assembly for a rotary regenerative heat exchanger having a splitter plate or stiffening member mounted between the heat transfer plates at a position intermediate between the inner and outer ends of the basket. The stiffening member includes elongated slots |
| 5376340 |
Regenerative thermal oxidizer |
December 27, 1994 |
| A regenerative thermal oxidizer for oxidizing a contaminant in an air or other gas stream includes a heat transfer material which heats the incoming air and collects heat from the exiting air. The direction of flow of the air through the oxidizer is periodically reverse for the regen |
