US3216486A

US3216486A - Rotary heat exchanger

Info

Publication number: US3216486A
Application number: US309925A
Authority: US
Inventors: Irvin G Hall; Casagrande Norman
Original assignee: Air Preheater Co Inc
Current assignee: Alstom Power Inc
Priority date: 1963-09-19
Filing date: 1963-09-19
Publication date: 1965-11-09
Anticipated expiration: 1982-11-09
Also published as: GB1075057A

Description

Nov. 9, 1965 l. G. HALL ETAL ROTARY HEAT EXCHANGER Filed Sept. 19, 1963 2 Sheets-Sheet 1 a l j 'uw 30 um Il 64I/Af y2 n ,f1/,4? 007 w as 6a 3s mr t 2! I VH I i I MII. i f2 2% my' 1% /HIM Zai .I *26 4 Nov.. 9, 1965 l. G. HALL ETAL 3,216,486

ROTARY HEAT EXCHANGER Filed Sept. 19, 1963 2 Sheets-Sheet 2 United States Patent O M' 3,216,486 ROTARY HEAT EXCHANGER Irvin G. Hall, Friendship, and Norman Casagrande, Wellsville, NX., assignors, by mesne assignments, to The Air Preheater Company, Inc., a corporation of Delaware Filed Sept. 19, 1963, Ser. No. 309,925 6 Claims. (Cl. 165-8) The present invention relates generally to heat exchange apparatus and particularly to an improved arrangement that permits the use of large capacity equipment not generally considered feasible because of various size limitations.

In rotary regenerative heat exchange apparatus of the type herein defined, a cylindrical rotor having a number of compartments containing a mass of heat absorbent material is first exposed to a Stream of heating gas, and then as the rotor is rotated about its axis, the compartments of heat absorbent material are exposed to a stream of cool air or other iiuid to be heated whereby heat from the hot gas may be transferred to the cooler air through the intermediary of the heat absorbent material. The rotor is usually surrounded by a housing having openings at either end for ducts that provide for the flow of the heating uid and the fluid to be heated.

The rotor is usually supported for rotation by a central support bearing that is carried by beams at the top or bottom of the rotor, and it is driven about its axis by a driving means acting at its periphery or at its axis of rotation so that all portions of the rotor may be traversed alternately by the heating fiuid,l and the fluid to be heated.

Arrangements as this have been generally satisfactory for heat exchangers of the size and type used heretofore; however, applications for heat exchangers having an over-all size and mass far exceeding anything in current use have been designed and proposed for future installation. Inasmuch as the size of heat exchangers being proposed is approaching a size limit as determined by the availability of components such as bearing means suitable for supporting for rotation a massive rotor that exceeds the limits of size and mass of anything heretofore considered, new arrangements for rotor support must be devised before the development of such apparatus may keep pace with the development of related equipment.

As a further consideration, heat exchange equipment of this type is usually shipped from manufacturing plant to erection site in an assembled or semi-assembled state and as such is limited in size by generally available shipping facilities. It is therefore an object of this invention to produce a rotor design which permits the rotor to be divided into relatively small basic units for shipping, and then readily reconstructed at its final destination for ultimate use.

The invention will be more clearly understood upon consideration of the following detailed description of an illustrative embodiment thereof when read in conjunction with the accompanying drawings in which:

FIGURE l is a sectional elevation of a rotary regenerative heat exchanger constructed and arranged according to the invention.

FIGURE 2 is a perspective view of a basic element compartment.

FIGURE 3 is a partial side View of the rotor showing the linkage relationship between adjacent compartments.

FIGURE 4 is a sectional view of the rotor as seen from line 4-4 of FIGURE 1.

In the drawings the numeral designates a trapezoidal or sector shaped housing of a compartment module that comprises the basic structural component of the apparatus herein defined. A series of such compartments 10 arranged in lateral juxtaposition together provide a composite substantially annular rotor having an inner 3,216,486 Patented Nov. 9, 1965 ICC wall 12 and an outer wall 14 joined together by radial walls 16. The walls of each compartment module 10 are comprised of relatively heavy, strong material capable of supporting thereon a similar series of upper compartments 18 having the same outside dimensions but being formed of comparatively light gauge material as a weight conservation measure. The upper compartments 18 are secured to the foundation compartments 10 after assembly by means such as welding whereby they serve together as a composite compartment. The composite compartments are adapted to receive sheets or blocks of heat absorbent material 20 to which hot gases may transmit heat and Which in turn may transmit the absorbed heat to cooler air or other fluid flowing in contact therewith.

Each composite element compartment is provided with a plurality of trucks 22 mounted on outer wall 14, and at least one truck 22 mounted on inner Wall 12 capable of independently supporting the compartment on annular track means 26 and 28 aligned therewith. The trucks may be simple Wheels or rollers but they must be sufiiciently strong to support the mass of the compartment and its load of heat absorbent element. Supporting means for the trucks 22 preferably include anti-friction bearings of a suitable type that substantially reduce the force required of drive means 30 to move the assembly about its axis.

Both outer and inner

annular tracks

26 and 28 may be positioned at the lower part of the rotor on the inner surface of end plate 34 which is carried by the support structure 36. A number of vertical risers or supports 35 spaced about the outer periphery of the rotor support the outer rim of an upper end plate 38 while a tubular sup` port 68 centrally positioned within the annular rotor provides a fixed support for the central portion of the upper end plate. Both

end plates

34 and 38 are apertured at 42 and 44 and connected to inlet and

outlet ducts

46 and 48 for the hot gas and inlet and outlet ducts 52 and 54- for the air in order that the hot gas and cooler air mayl be simultaneously directed through the flow passageways of the heat absorbent material carried by the rotor.

Each sectorial compartment 10 is pivotally linked to:

each adjacent compartment by a linkage arrangement 56- which is adapted to permit limited axial movement of each compartment independent of other compartments adjacent thereto. This arrangement holds the compartments at a fixed lateral spacing while permitting each compartment to at all times rest directly upon the subjacent portion of the

annular tracks

26 and 28.

An annular driving rack extending completely around the rotor is adapted to intermesh with a pinion gear on driving means 30 to move the rotor about its axis. The driving rack is comprised of a plurality of arcuate sections 32 each of which is firmly secured to the outer wall of each compartment 10.

While the rotor support means have been disclosed as being positioned adjacent the lower edge of the rotor, it should be clearly understood that such support means could be readily installed at other axially displaced positions around the periphery of the rotor. Moreover, the particular type of anti-friction trucks carried by the rotor are not necessarily limited to the type disclosed in the drawing. It is thus intended that all matter included in the foregoing description or shown in the accompanying drawings shall be interpreted as illustrative only and not in a limiting sense.

We claim:

1. A regenerative heat exchanger having a rotor comprising a plurality of independent open ended compartments arranged side-by-side in an endless assembly around a vertical axis, a mass of heat absorbent material carried by each compartment of the rotor, fixed support means independent from the rotor assembly subjacent the base thereof, anti-friction support means carried by each compartment of the Yrotor adapted to engage the xed support lmeans to provide a support for the rotor, linkage means pivotal about an axis normal to that of the rotor connecting each compartment of the rotor to the compartments adjacent thereto, inlet and outlet ducts for a heating Vfluid and a fluid to be heated arranged to confront opposite ends of the rotor, and means for rotating the compartments of the rotor over their xed support means whereby each part of the `rotor is alternately aligned with the ducts for the heating fluid and the fluid to `be heated.

2. A regenerative heat exchange apparatus having a rotor comprising a plurality of independent open ended compartments arranged .similarly side-by-side in an endless assembly around a vertical axis, linkage means pivotal about a horizontal axis pivotally linking each compartment -to other compartments adjacent thereto, a mass of heat absorbent material carried by each compartment of the rotor, support tracks Vindependently mounted subjacent laterally spaced edges of the compartment assembly, support means mounted on each compartment of said assembly to engage the support tracks and be supported thereby, inlet and outlet ducts fora heating fluid and a fluid to be heated arranged to confront opposite ends of the rotor, an arcuate drive rack similarly a'ixed to each compartment of the rotor so as to collectively provide a drive rack extending around the rotor, and driving means cooperating with said drive rack adapted to advance the rotor over said support tracks whereby each part of the rotor is alternately aligned with the ducts for the heating fluid and the fluid to be heated.

3. Rotary apparatus having a plurality of independent open-ended compartments of substantially trapezoidal conguration arranged in series around a vertical axis with their oblique walls in juxtaposition and their parallel Walls arranged end to end to form a substantially annular rotor with composite inner and outer walls, linkage means pivotal about a horizontal axis linking each compartment to other compartments adjacent thereto, inlet and outlet ducts at oppositeends of therotor arranged to direct a heating fluid and a iluid to be heated through spaced parts ofthe rotor, plate means confronting ends of the rotor intermediate said spaced ducts to limit fluid flow thereto, a mass of heat absorbent material carried by the compartments of saidrotor, independent support means positioned radially outside Said annular rotor, antifriction support means carried by the inner and outer walls engaging said independent support means, and means for rotating the rotor about its axis to alternately align each part of the rotor with the ducts for the heating fluid and the fluid to be heated.

4. Rotary apparatus of a type having a plurality of open ended compartments arranged in a mutually adjacent relationship about a vertical axis to provide a substantially annular rotor with inner and outer composite walls formed by the spaced walls of the compartments, linkage means pivotally connecting each compartment to other compartments adjacent thereto, inlet and outlet ducts at opposite ends of the rotor adapted and arranged to direct a heating fluid and a fluid to be heated through spaced parts of the rotor, a mass of heat absorbent material carried by each compartment of the rotor, fixed annular support means positioned subjacent the outer and the inner composite walls, anti-friction support means axially aligned with the xed annular support means and carried by radially spaced inner and outer walls of each compartment adapted to engage the annular support means to support `the rotor, sealing means bridging the space between adjacent compartment walls to preclude the ow of fluid therethrough, and means for rotating the rotor about its axis to alternately align each part of the rotor with the ducts for the heating uid and the fluid to be heated.

5. Rotary apparatus as defined in claim 4 wherein each compartment of the rotor is provided with a plurality of anti-friction support means on its radially outer wall and a single similar support on its radially inner wall to engage the xed annular support and provide stability of support to each compartment.

6. Rotary apparatus as defined in claim 4 wherein said linkage means is pivotally secured to the radially outer Wall of each compartment.

References Cited by the Examiner UNITED STATES PATENTS 1,166,142 12/15 Meyer 266-21 2,744,731 5/56 Brandt 165-9 FOREIGN PATENTS 789,970 1/5 8 Great Britain.

CHARLES SUKALO, Primary Examiner.

Claims

1. A REGENERATIVE HEAT EXCHANGER HAVING A ROTOR COMPRISING A PLURALITY OF INDEPENDENT OPEN ENDED COMPARTMENTS ARRANGED SIDE-BY-SIDE IN AN ENDLESS ASSEMBLY AROUND A VERTICAL AXIS, A MASS OF HEAT ABSORBENT MATERIAL CARRIED BY EACH COMPARTMENT OF THE ROTOR, FIXED SUPPORT MEANS INDEPENDENT FROM THE ROTOR ASSEMBLY SUBJACENT THE BASE THEREOF, ANTI-FRICTION SUPPORT MEANS CARRIED BY EACH COMPARTMENT OF THE ROTOR ADAPTED TO ENGAGE THE FIXED SUPPORT MEANS TO PROVIDE A SUPPORT FOR THE ROTOR, LINKAGE MEANS PIVOTAL ABOUT AN AXIS NORMAL TO THAT OF THE ROTOR CONNECTING EACH COMPARTMENT OF THE ROTOR TO THE COMPARTMENTS ADJACENT THERETO, INLET AND OUTLET DUCTS FOR A HEATING FLUID AND A FLUID TO BE HEATED ARRANGED TO CONFRONT OPPOSITE ENDS OF THE ROTOR, AND MEANS FOR ROTATING THE COMPARTMENTS OF THE ROTOR OVER THEIR FIXED SUPPORT MEANS WHEREBY EACH PART OF THE ROTOR IS ALTERNATELY ALIGNED WITH THE DUCTS FOR THE HEATING FLUID AND THE FLUID TO BE HEATED.