EP0236607A1 - Wärmerückgewinnungsapparat und Wärmerückgewinnungsverfahren - Google Patents

Wärmerückgewinnungsapparat und Wärmerückgewinnungsverfahren Download PDF

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Publication number
EP0236607A1
EP0236607A1 EP86301713A EP86301713A EP0236607A1 EP 0236607 A1 EP0236607 A1 EP 0236607A1 EP 86301713 A EP86301713 A EP 86301713A EP 86301713 A EP86301713 A EP 86301713A EP 0236607 A1 EP0236607 A1 EP 0236607A1
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EP
European Patent Office
Prior art keywords
heat recovery
pair
end walls
dampers
exit
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.)
Withdrawn
Application number
EP86301713A
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English (en)
French (fr)
Inventor
Merrill K. Gordon
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.)
Individual
Original Assignee
Individual
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
Priority to US06/703,994 priority Critical patent/US4583494A/en
Application filed by Individual filed Critical Individual
Priority to EP86301713A priority patent/EP0236607A1/de
Publication of EP0236607A1 publication Critical patent/EP0236607A1/de
Withdrawn legal-status Critical Current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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F28D21/0005—Recuperative heat exchangers the heat being recuperated from exhaust gases for domestic or space-heating systems
    • F28D21/0007—Water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers
    • F22B35/007—Control systems for waste heat boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/16—Waste heat
    • F24D2200/18—Flue gas recuperation

Definitions

  • This invention provides an improved heat recovery apparatus and improved method for recovering heat. More specifically, this inven strictlytion contemplates a novel process for recovering heat and a novel heat recovery apparatus which divert the flow of hot combustion gases towards a heat exchanger and allows the drainage of any accumulated condensate trickling off the heat exchanger.
  • U. S. Patent No. 4,053,106 by Karl discloses a heat recovery de­vice including a housing containing water tubes and a diverter valve that is movable in two positions.
  • U. S. Patent No. 4,351,276 by Kremer teaches a heat recovery device for boilers and including a housing having water coils therein and in which the housing conducts gas from the boiler outlet around the tubes to preheat the water therein.
  • U. S. Patent No. 2,236,170 by Fjellman depicts a flue heater for a water pipe passing through the same wherein the heater has a diverter plate which allows the flow of flue gas around the water pipe or directs the same to the outlet from the box to the flue. None of the foregoing prior art teach or suggest the particular method for recovering heat or the particular heat recovery apparatus of this invention.
  • This invention provides a novel heat recovery apparatus for boilers, or the like, comprising a heat recovery housing for example having a pair of side walls, a pair of end walls connected to side walls, a top and a bottom.
  • a combus­tion gas inlet is disposed within for example the bottom, and combustion gas out­let is positioned within for example the top.
  • a plurality of interconnected water conduit tubes is provided with a cold water inlet in communication with one of the end walls and a cold water exit also in communication with one of the end walls.
  • the plurality of interconnected water conduit tubes passes circuitously through the heat recovery housing.
  • a tube roof is interconnected between the pair of end walls about the water conduit tubes, above the cold water inlet and above the hot water exit.
  • a plurality of by-pass dampers is pivotally connected between the pair of end walls such that when the by-pass dampers are in a closed posi­tion, the closed by-pass dampers define a generally flat by-pass struc­ture angularly disposed with respect to a horizontal plane and exten­ding from between the pair of end walls, and also extending from one of pair of side walls up to the tube roof in order to divert or change the direction of flow of combustion gases from the combustion gas in­let toward the water conduit tubes.
  • a condensate drain is positioned in the bottom of the heat recovery housing and underneath the water conduit tubes.
  • a plurality of exit dampers is pivotally connected be­tween the pair of end walls such that when the exit dampers are in a closed position, the closed exit dampers define a generally horizontal flat exit structure extending from between the pair of end walls, and from the opposed other end wall of the pair of side walls from which the by-pass dampers extend from, up to the tube roof in order to be pivotally opened to allow the flow of combustion gases from the water conduit tubes to the combustion gas outlet.
  • This invention also provides a process for recovering heat from hot combustion gases flowing through a combustion gas inlet in a bottom of a heat recovery housing addition­ ally having a pair of side walls, a pair of end walls, a top including a combustion gas outlet, and a plurality of inner connected water con­duit tubes.
  • the water conduit tubes are provided with a roof and a cold water inlet in communication with one of the end walls to receive cold water and hot water exit in communication with one of the end walls to dispense warm or hot water.
  • the water conduit tubes pass circuitous­ly through the heat recovery housing.
  • the process includes the steps of: installing a condensate drain in the bottom of the heat recovery housing; connecting pivotally a plurality of by-pass dampers between the pair of end walls and extending from one of the pair of side walls up to the roof of the water conduit tubes; and attaching pivotally a plurality of exit dampers between the pair of end walls, and extending from the opposed side walls which the by-pass dampers extend from, to the roof of the water conduit tubes.
  • the process additionally comprises closing pivotally the by-pass dampers which essentially simultaneously diverts or changes the direction of flow of hot combustion gases towards the water conduit tubes in order to effect a heat transfer between the hot gases and the water passing circuitously through the conduit tubes and extracting condensate from the hot gases which accumulates in the bottom of the heat recovery housing; opening pivotally the exit dampers to allow the passage of the gases from the water conduit tubes to the combustion gas outlet; and draining accumulated condensate from the bottom of the heat recovery housing through the condensate drain.
  • Still further objects of the invention reside in the provision of an improved heat recovery process.
  • the heat recovery apparatus 10 has a pair of side walls 14-14; a pair of end walls 16-16 connected to the side walls 14-14; a top 18 and a bottom 20, both of which are attached to the side walls 14-14 and the end walls 16-16.
  • Top 18 includes a combustion gas outlet 22 in communication with a stack 24 which is mounted thereto; and bottom 20 has a combustion gas inlet 26 which is in communication with the products of combustion from the boiler 12.
  • One of the side walls 14 has an angularly slanted wall section 28 with a door 30.
  • Another door 32 is included in the side wall 14 opposed to the side wall 14 with the door 30.
  • a conden­sate drain 34 is positioned in the bottom 20 of the heat recovery housing 10 at the foot of the angularly slanted wall section 28.
  • a plurality of interconnected water conduit tubes 38 Passing circuitously throughout the heat recovery housing 10 is a plurality of interconnected water conduit tubes 38 which are provided with a cold water inlet 40 in communication with one of the end walls 16 and a hot water exit 42 in communication with the end wall 16.
  • a plurality of fins 44 is mounted on and around the water conduit tubes 38 in order to obtain optimum heat transfer when hot combustion gases from the boiler 12 pass over and around the water conduit tubes 38. Fins 44 may have a spiral arrangement as illustrated in FIG. 5 or a plate type arrangement as depicted in FIGS. 6 and 7.
  • a tube roof 46 is mounted over and is supported by the water conduit tubes 38 and interconnects the pair of end walls 16 above the water conduit tubes 38, and above the cold water inlet 40 and above the hot water exit where they pierce the end wall 16.
  • a plurality of by-pass dampers 28 are pivotally connected between the pair of end walls 16-16 such that when the by-pass dampers 48 are in a closed position (see FIG. 4), the closed by-pass dampers 48 define generally a flat by-pass structure angularly disposed with respect to a horizontal plane and extending between the pair of end walls 16-16 and from the side wall 14 with the door 32 up to the tube roof 46 in order to divert or change the direction of flow of combustion gases through the combustion gas inlet 26 towards the water conduit tubes 38 and the surrounding fins 44.
  • By-pass dampers 48 may be op­erated automatically through a mechanical means or they may be operated manually.
  • closed by-pass dampers 48 are generally parallel with the angularly slanted wall section 28 of the side wall 14. Each can effect smoothly an essentially 90° change of direction of the flow of combustion gases.
  • a plurality of exit dampers 50 are pivotally connected between the pair of end walls 16-16 such that when the exit dampers 50 are in a closed position, the closed exit dampers define a generally flat horizontal flat structure extending between the pair of end walls 16-16 and from the side wall 14 having the slanted wall 28 to the tube roof 46 in order to be pivotally opened to allow the flow of combustion gases from the water conduit tubes 38 off the slanted wall 28 to the gas outlet 22.
  • Exit dampers 50 may be operated automatically through a mechanical means or they may be operated manually.
  • combustion gas inlet 26 is in the side 14 (instead of the bottom 20) of heat re­covery apparatus 10, and is also in communication with the products of combustion from the boiler 12.
  • Angularly slanted section 28 is parallel to by-pass dampers 48 and is in the bottom 20 as opposed to being in one of the side walls 14-14 of the embodiment of FIGS. 1-7.
  • Tube roof 46 from the embodiment of FIGS. 1-7 defines a tube side 46 in the embodiment of FIG. 9 and interconnects between the pair of end walls 16-16 on the side of the water conduit tubes 38 and on the side of the cold water inlet 40 and on the side of the hot water exit 42.
  • the by-pass dampers 48 pivotally connect between the pair of end walls 16-16 and extend from the top 18 in proximity to the combustion gas inlet 26 to the tube side 46.
  • the exit dampers 50 pivotally connect between the pair of end walls 16-16 such that when the exit dampers 50 are in a closed position, the exit dampers 50 define a generally vertical flat exit structure extending between the pair of end walls 16-16 and from the tube side 46 to the bottom 20 of the heat recovery housing in order to be pivotally opened to allow the flow of combustion gases from the water conduit tubes 38 to the com­bustion gas outlet 22.
  • FIG. 8 is a schematic flow-diagram of another embodiment of the invention, with the exhaust gases of boilers 12-12 in communication with an exhaust conduit 52 that merges with a stack 54.
  • a motorized stack damper generally illustrated as 56, is attached to the stack 54 for pivotally controlling the exhaust gases when no heat recovery apparatus 10 is used.
  • heat recovery apparatus 10 is used and additionally includes an auto soot blower 58 an integrally induced draft fan motor means 60 for suction purposes off the stack 54, and an automatic draft control means 62 which is electrically draft sensorally attached via line 71 to a control panel means 72 that is also electrically draft sensorally at­tached ( or in communication with) to the inside of exhaust conduit 52 via another line 71.
  • the automatic draft control means 62 adjusts the draft through the stack 24.
  • Pump 68 pumps 60° to 140°F water from a hot water storage tank 64, and/or city water 70 from softener, through valve 66 around the circuitous water conduit tubes 38 and back into the hot water storage tank 64.
  • condensate drain 34 is installed in the bottom 20 of the heat recovery housing.
  • a plurality of by-pass dampers 48 are pivotally connected between the pair of end walls 16-16 and extend from one side wall 14 up to the roof 46 of the water conduit tubes 38 for the embodiment of FIGS. 1-7, or extend from top 18 down to the tube side 46 for the embodiment of FIG. 9.
  • a plurality of exit dampers 50 are attached pivotally between the pair of end walls 16-16, and extend from side wall 14 (opposed to the side wall 14 which by-pass dampers 48 extend from) to the roof 46 of the water conduit tubes 38 for the embodiment of FIGS. 1-7 or extend from the tube side 46 down to the bottom 20 for the embodiment of FIG. 9.
  • By-pass dampers 48 and exit dampers 50 may be operated manually, or preferably, automatically from a control means (such as control panel 72) in accordance with the amount of exhaust gas passing through combustion gas inlet 26 in the bottom 20.
  • By-pass dampers 48 are par­rallel to the slanted wall portion 28 for optimum angular reflection off the same after the combustion or exhaust gases leave the water conduit tubes 38.
  • the by-pass dampers 48 are pivotally closed, while essentially simultaneously the exit dampers 50 are pi­votally opened to allow the passage of the gases from the water conduit tubes 38 to the combustion outlet 22.
  • the newly formed condensate flows in the same direction as the dehydrated hot gases continually flowing over and around the conduit tubes 38 and fins 44.
  • the sloping wall portion 28 changes direction of the flow of the gases again.
  • the change in flow direction of the gases off the closed by-pass dampers 48 and the slanted wall portion 28 is about 90°.
  • the by-pass dampers 48 and the exit dampers 50 may be only par­tially opened or closed to allow some of the hot combustion gases from the inlet 26 to exit through outlet 22 without passing over and around the water conduit tubes 38 and fins 44.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
EP86301713A 1985-02-21 1986-03-11 Wärmerückgewinnungsapparat und Wärmerückgewinnungsverfahren Withdrawn EP0236607A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US06/703,994 US4583494A (en) 1985-02-21 1985-02-21 Heat recovery apparatus and heat recovery method
EP86301713A EP0236607A1 (de) 1986-03-11 1986-03-11 Wärmerückgewinnungsapparat und Wärmerückgewinnungsverfahren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86301713A EP0236607A1 (de) 1986-03-11 1986-03-11 Wärmerückgewinnungsapparat und Wärmerückgewinnungsverfahren

Publications (1)

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EP0236607A1 true EP0236607A1 (de) 1987-09-16

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EP86301713A Withdrawn EP0236607A1 (de) 1985-02-21 1986-03-11 Wärmerückgewinnungsapparat und Wärmerückgewinnungsverfahren

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0319392A1 (de) * 1987-12-02 1989-06-07 Chaudieres Seccacier Vorrichtung zur Wärmerückgewinnung
GB2416827A (en) * 2004-07-31 2006-02-08 Boulter Buderus Ltd Condensing unit
WO2010075601A3 (de) * 2008-12-16 2012-11-15 Fröling Heizkessel- Und Behälterbau Gesellschaft M.B.H. Heizkessel für festbrennstoffe, insbesondere aus nachwachsenden rohstoffen
FR3053774A1 (fr) * 2016-07-11 2018-01-12 Fives Solios Installation de refroidissement de gaz ou fumees dans un conduit de circulation a l'aide d'un dispositif de refroidissement

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US681245A (en) * 1901-01-07 1901-08-27 Alexander Muir Heating-stove and attachment.
US1885267A (en) * 1929-10-28 1932-11-01 Kalfus Victor Fluid heating device
GB719423A (en) * 1949-10-29 1954-12-01 Babcock & Wilcox Ltd Improvements in fluid heat exchange apparatus
US3122202A (en) * 1960-06-14 1964-02-25 Harry J Scharres Apparatus for heating and cooling air
FR1566024A (de) * 1968-05-22 1969-05-02
FR2475707A1 (en) * 1980-02-07 1981-08-14 Sevelen Metallbau Heat exchanger housing inserted between two sections of exhaust - recovers waste heat with by=pass regulated via temp. sensors and computing mechanism
EP0042129A2 (de) * 1980-06-12 1981-12-23 Joh. Vaillant GmbH u. Co. Abgaswärmetauscher
US4346674A (en) * 1981-02-18 1982-08-31 Applied Engineering, Inc. Economizer with soot blower
US4373473A (en) * 1981-03-16 1983-02-15 110707 Canada Ltee Heat recuperating water heating system
EP0078207A2 (de) * 1981-10-22 1983-05-04 Chaffoteaux & Maury Vorrichtungen zur Rückgewinnung von Kalorien aus Abgasen von Heizungsanlagen
US4401261A (en) * 1980-10-23 1983-08-30 Brown Leeroy W Flue gas heat recovery apparatus
GB2134233A (en) * 1983-01-25 1984-08-08 Kidd Archibald W Heat exchange apparatus
US4583494A (en) * 1985-02-21 1986-04-22 Gordon Jr Merrill K Heat recovery apparatus and heat recovery method

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US681245A (en) * 1901-01-07 1901-08-27 Alexander Muir Heating-stove and attachment.
US1885267A (en) * 1929-10-28 1932-11-01 Kalfus Victor Fluid heating device
GB719423A (en) * 1949-10-29 1954-12-01 Babcock & Wilcox Ltd Improvements in fluid heat exchange apparatus
US3122202A (en) * 1960-06-14 1964-02-25 Harry J Scharres Apparatus for heating and cooling air
FR1566024A (de) * 1968-05-22 1969-05-02
FR2475707A1 (en) * 1980-02-07 1981-08-14 Sevelen Metallbau Heat exchanger housing inserted between two sections of exhaust - recovers waste heat with by=pass regulated via temp. sensors and computing mechanism
EP0042129A2 (de) * 1980-06-12 1981-12-23 Joh. Vaillant GmbH u. Co. Abgaswärmetauscher
US4401261A (en) * 1980-10-23 1983-08-30 Brown Leeroy W Flue gas heat recovery apparatus
US4346674A (en) * 1981-02-18 1982-08-31 Applied Engineering, Inc. Economizer with soot blower
US4373473A (en) * 1981-03-16 1983-02-15 110707 Canada Ltee Heat recuperating water heating system
EP0078207A2 (de) * 1981-10-22 1983-05-04 Chaffoteaux & Maury Vorrichtungen zur Rückgewinnung von Kalorien aus Abgasen von Heizungsanlagen
GB2134233A (en) * 1983-01-25 1984-08-08 Kidd Archibald W Heat exchange apparatus
US4583494A (en) * 1985-02-21 1986-04-22 Gordon Jr Merrill K Heat recovery apparatus and heat recovery method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0319392A1 (de) * 1987-12-02 1989-06-07 Chaudieres Seccacier Vorrichtung zur Wärmerückgewinnung
FR2624268A1 (fr) * 1987-12-02 1989-06-09 Seccacier Echangeur de chaleur notamment un recuperateur de chaleur sur les produits de combustion tels que fumees d'un foyer d'une chaudiere ou gaz d'echappement de moteurs a combustion interne et en particulier d'une chaudiere a gaz ou d'un moteur a gaz
GB2416827A (en) * 2004-07-31 2006-02-08 Boulter Buderus Ltd Condensing unit
WO2010075601A3 (de) * 2008-12-16 2012-11-15 Fröling Heizkessel- Und Behälterbau Gesellschaft M.B.H. Heizkessel für festbrennstoffe, insbesondere aus nachwachsenden rohstoffen
FR3053774A1 (fr) * 2016-07-11 2018-01-12 Fives Solios Installation de refroidissement de gaz ou fumees dans un conduit de circulation a l'aide d'un dispositif de refroidissement

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