Abb Air Preheater Inc.

Arvos Ljungstrom LLC

Arvos Technology Limited

Alstom Technology Limited

Combustion Engineering, Inc.

Arvos Gmbh

James David Seebald

Kevin James O'Boyle

Wayne S Counterman

Tadek Casimir Brzytwa

Glenn D Mattison

James W Birmingham

Jeffery E Yowell

Michael M Chen

Scott Frederick Harting

Gary Foster Brown

Srivats Srinivasachar

David K Anderson

Mark Palkes

Majed A Toqan

Michael J Rini

Jeffrey M O'Boyle

Carlton L Bledsoe

Kjell E Porle

Jeffrey E Yowell

Friedrich W Pinnekamp

William T Amundson

Francis B Slocum

Nathan T Atkinson

Jefferey E Yowell

Jeffery Edward Yowell

Jeffrey M O'BOYLE

Nathan Atkinson

Kevin James O´Boyle

Disclosed is a heat transfer assembly for a rotary regenerative preheater. The heat transfer assembly includes a plurality of heat transfer elements stacked in spaced relationship to each other in a manner such that each notch from a plurality of notches of one of the heat transfer element rests on respective flat sections from a plurality of flat sections of the adjacent heat transfer elements to configure a plurality of closed channels, each isolated from the other, wherein each of the channels has a configuration in a manner such that each of corrugation sections from a plurality of corrugation sections of one of the heat transfer elements faces respective undulation sections from a plurality of undulation sections of the adjacent heat transfer elements.

Heat transfer assembly for rotary regenerative preheater

A stack of heat transfer sheets includes one or more first sheet which includes a first undulating surface formed by first lobes that are parallel to each other and oriented at a first angle. The first sheets include a second undulating surface formed by second lobes that are parallel to each other and oriented at a second angle, different from the first angle. The first sheets include a third undulating surface formed by third lobes extending from one or more ends of the first sheet and terminating at an intermediate point between the end and an opposing end thereof. The third lobes are parallel to each other and parallel to the direction of flow through the stack. The stack includes one or more second sheets defining a plurality of sheet spacing features which engage a portion of the first sheet.

Heat transfer sheet for rotary regenerative heat exchanger

Disclosed is a heat transfer assembly for a rotary regenerative preheater. The heat transfer assembly, includes, a plurality of heat transfer elements stacked in spaced relationship to each other in a manner such that each notch from a plurality of notches of one of the heat transfer element rests on respective flat sections from a plurality of flat sections of the adjacent heat transfer elements to configure a plurality of closed channels, each isolated from the other, wherein each of the channels has a configuration in a manner such that each of corrugation sections from a plurality of corrugation sections of one of the heat transfer elements faces respective undulation sections from a plurality of undulation sections of the adjacent heat transfer elements.

A closed channel rotary regenerative air preheater includes element supporting baskets that have first heat transfer elements having first arches arranged in an alternating order with second heat transfer elements having second arches. Each of the first arches has a first apex and a concave segment extending therefrom and each of the second arches has a second apex and a convex segment extending therefrom. Each of the convex segments is nested in a respective one of the concave segments thereby defining a contact line therebetween which extends an entire length of the first heat transfer element and the second heat transfer element. Adjacent pairs of the contact lines define a closed passageway therebetween and between the first heat transfer element and the second heat transfer element for heat transfer fluid flow therethrough.

Heat transfer elements for a closed channel rotary regenerative air preheater

A heat transfer sheet for a rotary regenerative heat exchanger includes a plurality of rows of heat transfer surfaces each being aligned with a longitudinal axis extending between first and second ends thereof. The heat transfer surfaces have a height relative to a central plane of the heat transfer sheet. The heat transfer sheet includes one or more notch configurations for spacing the heat transfer sheets apart from one another. Each of the notch configurations are positioned between adjacent rows of heat transfer surfaces. The notch configurations include one or more lobes connected to one another, positioned in a common flow channel and extending away from the central plane and one or more lobes extending away from the central plane in an opposite direction and being coaxial. The lobes have height a relative to the central plane that is greater than the height of the heat transfer surfaces.

Alternating notch configuration for spacing heat transfer sheets

A heat transfer sheet [] for a rotary regenerative heat exchanger is shaped to include sheet spacing features [], which provide spacing between adjacent heat transfer sheets [], and undulation surfaces [] (corrugations) in the sections between the sheet spacing features []. The undulation sections [] are constructed of regularly spaced lobes [] extending at an angle with respect to the spacing features []. The undulating sections [] impart turbulence in the air or flue gas flowing between the heat transfer sheets [] to improve heat transfer. The heat transfer sheets [] may include undulating surfaces that differ in angle of their lobes [

A rotary regenerative heat exchanger () employs heat transfer elements () shaped to include notches (), which provide spacing between adjacent elements (), and undulations (corrugations) () in the sections between the notches. The elements () described herein include undulations () that differ in height and/or width.

Heat transfer element for a rotary regenerative heat exchanger

A rotary regenerative heat exchanger () employing heat transfer elements () is shaped to include notches (), providing spacing between adjacent elements () and undulations (corrugations) () in sections between the notches (). Elements () include undulations () differing in height and/or width. These differing undulations impart turbulence to air or flue gas flowing between the elements () for heat transfer thereto.

The flue gas temperature coming from an air preheater to a particulate collection device such as an electrostatic precipitation or fabric filter is reduced to improve the operation of the particulate collection device. This may be done by reducing the exit flue gas temperature from the air preheater or reducing the temperature after exiting. In one embodiment, air in excess of that needed for combustion is passed through the air preheater with the heated excess air either being dumped or used for a variety of purposes in the plant. A particular embodiment involves segmenting the air outlet side of a rotary regenerative air preheater and withdrawing the excess air from the segment where the dust loading is the lowest. Further, additional cooling of the flue gas can be provided by reducing the quantity of primary air that typically bypasses the air preheater and then providing other ways to control the primary air temperature to the pulverizers. The flue gas temperature may also be cooled after the air preheater by heat exchange or spray cooling with water.

Steam generator system operation

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 cause turbulence and mixing to enhance the heat transfer. Various methods of forming the indentations are disclosed.

Air preheater heat transfer elements and method of manufacture

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 ridges alternate to extend transversely from opposite sides of each heat transfer plate. The ridges of the adjacent plates are oriented obliquely in opposite directions relative to the main flow direction and contact each other solely at points of intersection of the ridges.

Air preheater heat transfer surface

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 face of the rotor for receiving the energy and generating an output signal indicative of the intensity of the energy.

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Wellsville, NY, United States of America

James David Seebald