US1516108A - Regenerative air preheater - Google Patents
Regenerative air preheater Download PDFInfo
- Publication number
- US1516108A US1516108A US583459A US58345922A US1516108A US 1516108 A US1516108 A US 1516108A US 583459 A US583459 A US 583459A US 58345922 A US58345922 A US 58345922A US 1516108 A US1516108 A US 1516108A
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- Prior art keywords
- rotor
- regenerative
- fans
- air
- preheater
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- Expired - Lifetime
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Classifications
-
- 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
-
- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S165/00—Heat exchange
- Y10S165/009—Heat exchange having a solid heat storage mass for absorbing heat from one fluid and releasing it to another, i.e. regenerator
- Y10S165/013—Movable heat storage mass with enclosure
- Y10S165/015—Movable heat storage mass with enclosure with pump
Definitions
- NrLs FREDRIK FILEMoN ANDERssoN a-
- The. object of the present invention is' to remove these drawbacks byA providing a regenerative air-preheater ⁇ which is of the i continuously rotating type and requires a very small space, the invention consisting therein ⁇ that the fans drive forth the different gases '1n a radialdirection through the rotor, the same being preferably arranged' in the axial extension ofthe rotor.
- A providing a regenerative air-preheater ⁇ which is of the i continuously rotating type and requires a very small space
- the invention consisting therein ⁇ that the fans drive forth the different gases '1n a radialdirection through the rotor, the same being preferably arranged' in the axial extension ofthe rotor.
- FIG. 1 shows to the right an axial section and to of one embodiment of Fig. 2 shows in its upper portion 'a section at right angles to the rotor shaft and in its lower portionl aplan view of this embodiment, whereas Fig. 3 shows an elevation thereof.
- Figs. 4, l5 and 6 represent views of a second embodiment corresponding' to Figs. 1, 2 and 3 respectively.
- This regenerative' material forms -in the embodiment shown what .might be termed a poly-faced ring body the imaginary inner 'surface ofl which may be considered. as a wall with multitudinous passageways in it designated byj reference character 2.
- the imaginary. outer wall of this ring body isdesignated by the reference character 3.
- These walls 2 and 3 are formed by the ends of the members n of theY regenerative mass which preferably consists/)of metal plates so arranged as to afford apluralityV of passageways allowing passage of thefluid substantially as indicated by the arrows.
- Fig. 2 of the drawings. 4 The walls 2 and 3 will have the appearance of a honey comb structure, -looking at the same in a radial direction.
- the air-preheater is connected in such' a manner to the furnace in which it is. to be used that the hot gases enter throng the radial extension of the rotor 1, and pass in the direction of the arrows 10 and 11 through the regenerative rotor.
- the air to be preheated is suckedv in by the fan 5 and is forced, as shown by in a radial direction through the rotor 3, after which it-escapes in a heated condition from ythe preheater through the outlet 14 to the place where it is to be used.v
- the preheatng of the air takes place accordin to the counter-flow printhe arrows 12 and 13,-
- the fans are situated outsidel the rotor inthe axial ldirection thereof, but they may also be conceived as'being located in the inletor outlet passages on the outside of'the rotor in the radial direction thereof, the latter arrangement' bein less suitable, however, because the fans will then be situated where the air and the gases are the hottest.
- 4 u l rlhe rotor is covered on its upper and lower sides by cover plates y15 and 16 respectively, in which holes 17 and 18 respectively are provided for letting outl the gases. to the center of the rotor,
- the said openings inthe rotor plates correspond to the surfaces in Fig. 2 indicated with dot-anddash lines.
- the gases may also pass in a radical direction through the rotor which is opposed to the directions'shown in the figure by the arrows, it is true, but the directions indicated are the most suitable, in that'the areas of the passages through the regenerative mass are increased thereby, -or decreased in the same degree as the gases are heated or cooled in passing through the tothe increase or ⁇ rotor, which corresponds the decrease of the gas volume.
- rlhe airpreheater shown is provided in known manner with packing means and with means for mounting fans andthe like with loose rings, and arrangements previously known from such air-preheaters, in which the gasesilow through the rotor 'in an axial direction, such as sweeping] devices 31, may also be provided in the present air-preheater, so far as the constructionsy allows it, 23 denotes a device preventing the' iiuey gases from passing into the fresh-air channel, and
- Figs. 4, 5 and V6 illustrate a second em- ⁇ bodimen'tot 'an' air-preheater according to the same way as above described, the regenerative mass is arranged in a ring between the imaginary walls 2 and 3, whereby the rotor will be cylindrically hollow.
- the hollow in question which conlstitutes a passage ⁇ for the due gases 'andthe air to be preheated, is divided in two parts by means of an oblique non-rotating wall 20, the diderent gases passing respectively on either side of this wall.
- the rotor is mounted on its shaft y 2L ln this embodiment, the walls 22 shown in the preceding embodiment, together with the apertured cover plates 15 and 16, are replaced only byl the oblique wall 20.
- the packings, bearings land adjusting means for the fans, etc. F ig. l
- amorce ranged as to permit the uid giving H heat and the fluid to be heated to pass through the regenerative material in a radial direction of the rotor.
- A. regenerative reheater for air and the like in furnace pliante or the like com prising a' regenerative material, a rotatably mounted rotor carrying said regenerative material, means for rotating the rotor partly in the fluid giving' of heatand partly in the duid to he heated, acasing surroundin the rotor, inlet and outlet openings in sai( csing and fans for moving the fluids through the rotor mounted in said casingon a'common shaft which coincides with the axis of planes parallel Vto the plane of rotation of the rotor, said inlet and outlet openings and said fans being so arranged as to permit the fluid giving odeheat and the fluid to be heated to pass through the regenerative ma terial in a radial direction of the rotor.
- a lregenerative preheater for air and the like in furnace plants or the like comprising a regenerative material, a rotatably mounted rotor carrying lsaid regenerative material, .means for rotatingthe rotor parl;-v ly in the duid giving od heat and parti in ⁇ ythe fluid to be heated, a casing surroun ing the rotor, inletand outlet openings in said casing and fans for, moving the'4 fluids through the rotor mounted fon a common shaft, which passes through the shaft oi the rotor, and operating in planes parallel to the plane of rotation of the rotor, said inlet' and outlet openings and said fans being so arranged as to permit the iiuid iving ed heat and the duid to loe heated to pase throu h the regenerative material in a radial direction of the rotor.
- a regenerative reheater for air and the like in yfurnace p ants or 'the like comprising a regenerative material, a frame carryin ysaid regenerative mass, inlet and outlet lcannels for the duid giving ojl heat and for the duid to be heated respectively, means for e'ecting a. relative movement between said frame and said inlet and outlet channels, a casing surrounding the ⁇ frame,an inlet opening in said casmgor the one tluid arranged 1n a radial direction of the rotor,
- said fans bein'so arranged as to'permit the:A
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
Nov, 18,1924. n, 1,5l 8,108v
' F. LJUNGSTROM ET AL f REGENERATIVE AIR PREHEATER Filed Aug.' 21, 1922y s sheets-'sheet 2 Nav, 18, 24.
LJUNGSTR REGENERATIVE AIR PREHEATER OM ET AL 3 sheets-sheet 5 Filed Aug.- 2l 1922 i i fans rand the Y sub'ect of the Kin `Regenerative Air-Preheaters,
Patented Nov. 18, 1924. i I
UNITED STATES PATENT OFFICE.
Fammi: LJuNes'rnM, 'or LIDINeo-Bnrzvlx, ANnmLs rarmrux rrnmlroiv AN'-, n assIeNoas To Ax'rmBoLAeE'r LJUNesTBMs ANGTURBIN, or STOCKHOLM. SWEDEN,
DRSSON, OF STOCKHOLM, SWEDEN,
A CORPORATION,-
' REGENERATIVE am raamt;'rim y Application ledugust 21, 1922. Serial No. 583,459.
` To all whom it concern:
Be it known that we, (1) FREDRIK LJUNG- sTRM, a subject of the King of Sweden, residing 'at Lidingo-Brevik, Sweden, and
2 NrLs FREDRIK FILEMoN ANDERssoN, a-
Vof Sweden, residing at tockholm, Sweden, vhave useful Improvements in of' which the iddaregatan, invented new and following is a specification. In' generative air-preheaters it has been previously proposed to make these of a regenerative mass carried by a continuously rotating rotor which is surrounded by a casing having fans arranged therein, which fans drive forth'fthe air andthe flue gases. In these constructions, the gases and the air are driven by the fans through the rotor in the axial direction', the fans being preferably mounted on a .common shaft disposed axially outside the'rotor and atA right angles to the axis of the rotor. v
On account of the arrangemen ofjthe shape of the casing, these con structions are very large and, therefore, un-
necessarily spacious. If such a preheater is intended to be used as \a preheater for y-the combustion air ina power house for steam operation, and is mounted in a branch pipe to the smoke stack, d iiiiculties have always been encountered in providing the required space f or the same.
The. object of the present invention is' to remove these drawbacks byA providing a regenerative air-preheater` which is of the i continuously rotating type and requires a very small space, the invention consisting therein `that the fans drive forth the different gases '1n a radialdirection through the rotor, the same being preferably arranged' in the axial extension ofthe rotor. In the accompanying drawings, two embodiments of the invention are diagrammaticallyv shown by way o f example. Fig.
1 shows to the right an axial section and to of one embodiment of Fig. 2 shows in its upper portion 'a section at right angles to the rotor shaft and in its lower portionl aplan view of this embodiment, whereas Fig. 3 shows an elevation thereof.' Figs. 4, l5 and 6 represent views of a second embodiment corresponding' to Figs. 1, 2 and 3 respectively. u
Vbe used as 4da -inlet opening 30 situated in ciple, in that t In the embodiment Shown in Figs. 1, 2 and.3, 1 designates the regenerative rotor.
This regenerative' material forms -in the embodiment shown what .might be termed a poly-faced ring body the imaginary inner 'surface ofl which may be considered. as a wall with multitudinous passageways in it designated byj reference character 2. The imaginary. outer wall of this ring body isdesignated by the reference character 3. These walls 2 and 3 are formed by the ends of the members n of theY regenerative mass which preferably consists/)of metal plates so arranged as to afford apluralityV of passageways allowing passage of thefluid substantially as indicated by the arrows. As an example of oneform of material horizontally disposed corrugated plates placed with' the corrugations oblique to each other may grammatically indicated in Fig. 2 of the drawings. 4 The walls 2 and 3 will have the appearance of a honey comb structure, -looking at the same in a radial direction.
It is obvious that many forms of regenerative material may be used and the so-called poly-faced ring body may be'of other and varied constructions. he
rotor. is attached to the shaft 4 throughN which extends the common shaft 6 of the, fansg and 7. The fan-shaft v4`is connected by means of a coupling 8 directly, or
through thel medium of a pulley, with a.
drivingmotor, not shown in the drawlng.
From theA shaft of the fans, the motion 1s ear 9 to vgeared down through a4 planet the rotor shaft 4 which is thus driven fromthe same motor as the fans.
sol
The air-preheater is connected in such' a manner to the furnace in which it is. to be used that the hot gases enter throng the radial extension of the rotor 1, and pass in the direction of the arrows 10 and 11 through the regenerative rotor. The air to be preheated is suckedv in by the fan 5 and is forced, as shown by in a radial direction through the rotor 3, after which it-escapes in a heated condition from ythe preheater through the outlet 14 to the place where it is to be used.v Preferably, as shown in Fig. 2, by the arrows 10, 11, 12 and 13 the preheatng of the air takes place accordin to the counter-flow printhe arrows 12 and 13,-
i the outside and inwardly through the rotor,
i the invention. ln'
. et by means of spokes 60,
lout through y packing while the air to be preheated passes from the inside and outwardly through the same rotor. ln the embodiment shown, the fans are situated outsidel the rotor inthe axial ldirection thereof, but they may also be conceived as'being located in the inletor outlet passages on the outside of'the rotor in the radial direction thereof, the latter arrangement' bein less suitable, however, because the fans will then be situated where the air and the gases are the hottest. 4 u l rlhe rotor is covered on its upper and lower sides by cover plates y15 and 16 respectively, in which holes 17 and 18 respectively are provided for letting outl the gases. to the center of the rotor,
the regenerative mass. The said openings inthe rotor plates correspond to the surfaces in Fig. 2 indicated with dot-anddash lines.
The gases may also pass in a radical direction through the rotor which is opposed to the directions'shown in the figure by the arrows, it is true, but the directions indicated are the most suitable, in that'the areas of the passages through the regenerative mass are increased thereby, -or decreased in the same degree as the gases are heated or cooled in passing through the tothe increase or` rotor, which corresponds the decrease of the gas volume. rlhe airpreheater shown is provided in known manner with packing means and with means for mounting fans andthe like with loose rings, and arrangements previously known from such air-preheaters, in which the gasesilow through the rotor 'in an axial direction, such as sweeping] devices 31, may also be provided in the present air-preheater, so far as the constructionsy allows it, 23 denotes a device preventing the' iiuey gases from passing into the fresh-air channel, and
vice versa.' lPartitions 22 divide the gases in a number of currents.
.Figs. 4, 5 and V6 illustrate a second em-` bodimen'tot 'an' air-preheater according to the same way as above described, the regenerative mass is arranged in a ring between the imaginary walls 2 and 3, whereby the rotor will be cylindrically hollow. The hollow in question, which conlstitutes a passage `for the due gases 'andthe air to be preheated, is divided in two parts by means of an oblique non-rotating wall 20, the diderent gases passing respectively on either side of this wall. ln 'thisembodiment, the rotor is mounted on its shaft y 2L ln this embodiment, the walls 22 shown in the preceding embodiment, together with the apertured cover plates 15 and 16, are replaced only byl the oblique wall 20. Arranged in the manner above, described are .the packings, bearings land adjusting means for the fans, etc. F ig. l
whence they pass in andy lerares ing often near the roof above the remans place. An air-preheaterlo the older type occupies' a much` larger space andis more dicult to'dispose of adjacent the roof than a preheater in accorda-nce with the invention. axial extension of the air-preheater to `nearly the double extent will evidently interfere with the space availablenunderneath the ,same and, therefore, a preheater accordlngtofl the inventionis better adapted for being installed in boiler plants theI beginning, constructions. n
llhat we claim as new anddesire to seure by Letters Patent of the United States 1s:- f
1a A regenerative the li e in furnace -prising a regenerative material, a trame carrying said regenerative were not'intended for such and for the fluid to be'heated respectively,
means for edecting a relativev movement between said frame and said inlet and outlet channels, a casing surrounding the trame, inlet and outlet'openings in said casing and fans arranged in said casing, said inlet and outlet openings and said fans being so ar-l ranged as to permit the fluid giving oli' heat and the duid to be heated to pass through therege'nerative material in a radial direction ot the frame., i
3. A ,regenerative 'preheater for air and the like in furnace plants or the like com'- prising a regenerative material, a rotatably ymounted lrotor carrying said regenerative material, means for rotating the rotor part= lv in the duid giving ed heat and partly in the duid to be heated, a casing surrounding the rotor, inlet and ontlet openings casing vand fans for moving the duide through the rotor arranged in said cas ng, said fans operating in planes parallel to the plane of rotation of the rotor, said inlet and outlet openings and said fans being so ar 4massinlet. and outlet channels for the Huid giving on' heat' giving od heat l g t heated respectively, l means for enectmg a relative movement bewhich, nem ,Y
preheater for air and i plants or. the like, vcorn-- A rotation of the motor, and operating in.
amorce ranged as to permit the uid giving H heat and the fluid to be heated to pass through the regenerative material in a radial direction of the rotor.
4. A. regenerative reheater for air and the like in furnace pliante or the like ,com prising a' regenerative material, a rotatably mounted rotor carrying said regenerative material, means for rotating the rotor partly in the fluid giving' of heatand partly in the duid to he heated, acasing surroundin the rotor, inlet and outlet openings in sai( csing and fans for moving the fluids through the rotor mounted in said casingon a'common shaft which coincides with the axis of planes parallel Vto the plane of rotation of the rotor, said inlet and outlet openings and said fans being so arranged as to permit the fluid giving odeheat and the fluid to be heated to pass through the regenerative ma terial in a radial direction of the rotor. i
5. A lregenerative preheater for air and the like in furnace plants or the like comprising a regenerative material, a rotatably mounted rotor carrying lsaid regenerative material, .means for rotatingthe rotor parl;-v ly in the duid giving od heat and parti in` ythe fluid to be heated, a casing surroun ing the rotor, inletand outlet openings in said casing and fans for, moving the'4 fluids through the rotor mounted fon a common shaft, which passes through the shaft oi the rotor, and operating in planes parallel to the plane of rotation of the rotor, said inlet' and outlet openings and said fans being so arranged as to permit the iiuid iving ed heat and the duid to loe heated to pase throu h the regenerative material in a radial direction of the rotor. e
6. A regenerative reheater for air and the like in furnace p ants or the like, comn .prising a regenerative material, a 'frame carryin said regenerative mass, inlet and outlet c annel's for the duid giving o heat I and 'for the Huid to be heated respectively, i ,means for electing a relative movement he-y 'e tween saidfframe and said inlet and outlet Vchannele, a casing surrounding the frame, an
direction of the rotor and fans for movingthe two/fluidsy through the rotor, said fans being so arranged yas tol permit the iluid giving od heat and theuidto loe heated to pass through the reenerative material in a radial direction of :"l: frame.
A 7. A regenerative reheater for air and the like in yfurnace p ants or 'the like, comprising a regenerative material, a frame carryin ysaid regenerative mass, inlet and outlet lcannels for the duid giving ojl heat and for the duid to be heated respectively, means for e'ecting a. relative movement between said frame and said inlet and outlet channels, a casing surrounding the `frame,an inlet opening in said casmgor the one tluid arranged 1n a radial direction of the rotor,
an outlet openin `for tllevsaxne iluid air ranged in an axis. direction ofthe rotor,'an inlet openm orthe other duid arranged in an axial infection of the rotor, an outlet openingl for the latter duid.V arranged in a radial direction of the rotor, and fans 'or f moving the two duide through the. rotor,
said fans bein'so arranged as to'permit the:A
iirst-ineritione rotor ,from without and inwards andthe last-mentioned fluid to pass' through the rotor fromwithin and outwards.
ln witness whereof we have hereunto set iluid to pass through' the'A our hands in the presence of two witnesses'.
maarssen i.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US583459A US1516108A (en) | 1922-08-21 | 1922-08-21 | Regenerative air preheater |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US583459A US1516108A (en) | 1922-08-21 | 1922-08-21 | Regenerative air preheater |
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US1516108A true US1516108A (en) | 1924-11-18 |
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US583459A Expired - Lifetime US1516108A (en) | 1922-08-21 | 1922-08-21 | Regenerative air preheater |
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2579173A (en) * | 1947-09-09 | 1951-12-18 | Power Jets Res & Dev Ltd | Regenerative heat exchanger |
US2598182A (en) * | 1947-12-12 | 1952-05-27 | Power Jets Res & Dev Ltd | Heat exchanger bearing arrangement |
US2615685A (en) * | 1947-12-12 | 1952-10-28 | Parsons C A & Co Ltd | Regenerative heat exchanger |
US2643097A (en) * | 1947-12-12 | 1953-06-23 | Parsons C A & Co Ltd | Regenerative heat exchanger |
US2667034A (en) * | 1946-04-01 | 1954-01-26 | Power Jets Res & Dev Ltd | Air turbine power plant having rotary regenerator to transfer heat from an afterburner to the motive fluid |
US2795109A (en) * | 1952-06-23 | 1957-06-11 | Parsons C A & Co Ltd | Combined combustion chamber, heat exchanger and flame trap for combustion turbine plants |
US2846195A (en) * | 1946-02-04 | 1958-08-05 | Power Jets Res & Dev Ltd | Heat exchangers |
US2915297A (en) * | 1956-04-24 | 1959-12-01 | Bmw Triebwerkbau Ges Mit Besch | Regenerative heat exchanger with moveable matrix |
US3023577A (en) * | 1955-10-24 | 1962-03-06 | Williams Res Corp | Gas turbine with heat exchanger |
DE2910423A1 (en) * | 1979-03-16 | 1980-09-25 | Maico Elektroapparate | Rotary air storage heat exchanger - has both end faces open to inner chambers for fresh and stale air |
-
1922
- 1922-08-21 US US583459A patent/US1516108A/en not_active Expired - Lifetime
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2846195A (en) * | 1946-02-04 | 1958-08-05 | Power Jets Res & Dev Ltd | Heat exchangers |
US2667034A (en) * | 1946-04-01 | 1954-01-26 | Power Jets Res & Dev Ltd | Air turbine power plant having rotary regenerator to transfer heat from an afterburner to the motive fluid |
US2579173A (en) * | 1947-09-09 | 1951-12-18 | Power Jets Res & Dev Ltd | Regenerative heat exchanger |
US2598182A (en) * | 1947-12-12 | 1952-05-27 | Power Jets Res & Dev Ltd | Heat exchanger bearing arrangement |
US2615685A (en) * | 1947-12-12 | 1952-10-28 | Parsons C A & Co Ltd | Regenerative heat exchanger |
US2643097A (en) * | 1947-12-12 | 1953-06-23 | Parsons C A & Co Ltd | Regenerative heat exchanger |
US2795109A (en) * | 1952-06-23 | 1957-06-11 | Parsons C A & Co Ltd | Combined combustion chamber, heat exchanger and flame trap for combustion turbine plants |
US3023577A (en) * | 1955-10-24 | 1962-03-06 | Williams Res Corp | Gas turbine with heat exchanger |
US2915297A (en) * | 1956-04-24 | 1959-12-01 | Bmw Triebwerkbau Ges Mit Besch | Regenerative heat exchanger with moveable matrix |
DE2910423A1 (en) * | 1979-03-16 | 1980-09-25 | Maico Elektroapparate | Rotary air storage heat exchanger - has both end faces open to inner chambers for fresh and stale air |
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