US3295503A - Devices for exploiting the flue gas heat in the flue of a hot water boiler - Google Patents

Devices for exploiting the flue gas heat in the flue of a hot water boiler Download PDF

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US3295503A
US3295503A US424249A US42424965A US3295503A US 3295503 A US3295503 A US 3295503A US 424249 A US424249 A US 424249A US 42424965 A US42424965 A US 42424965A US 3295503 A US3295503 A US 3295503A
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flue
hot water
water
boiler
exploiting
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US424249A
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Ranebo Per Herman
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    • 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
    • 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
    • F22D1/16—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways
    • 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
    • F22D1/24—Feed-water heaters, i.e. economisers or like preheaters with fire tubes or flue ways traversing feed-water vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G3/00—Steam superheaters characterised by constructional features; Details of component parts thereof
    • F22G3/009—Connecting or sealing of superheater or reheater tubes with collectors or distributors

Definitions

  • the device outlined in the foregoing constitutes both an eflicient heat exchanger for exploiting the heat contents of the flue gases and a device protecting the material in the flue, chimney and adjoining parts against overheating.
  • the flue 2 extends from the hot water 'boiler 1 horizontally into a brick base 3 with smoke box and smoke box door 4 and from said base 3 vertically upwardly through the chimney 5.
  • the flue 2 is of a relatively small diameter as compared with the space of the chimney, which in the example shown is of a normal size for a small apartment house or detached house whereby an amply dimensioned free space is obtained between the inner side of the chimney and the flue 2 to accommodate an outer water tube 6 which is mounted in the chimney and surrounds the flue 2 in the manner of a water jacket throughout the greater part of the vertical length of the flue 2.
  • the diameter of the outer water tube 6 is so much larger than that of the inner flue 2 that a sufliciently wide gap remains between the twotubes for leading the return water back to the boiler.
  • the inner tube 2 has a diameter of about 15 cm. and the outer tube 6 a diameter of about 20 cm.
  • the width of the gap between the tubes then is about 2.5 cm., which has proved suflicient in normal cases.
  • the water passage between the two tubes which is of annular section, is closed at the upper and lower ends and has these ends connected to the water return conduit 7 from the hot water system and to the water return tube 8 leading to the boiler, respectively.
  • the lower end of the water conduit terminates at a level with the water return tube 8 and the upper end thereof at a level with or above the water return conduit 7 from the uppermost storey.
  • the outer water tube 6 can be supported at the lower end in a manner shown in the drawing on a shelf 9 which is built of bricks in the chimney or consists of holders secured therein.
  • the seal between the upper and lower ends of the water tube 6 and the flue 2 is realized in that an annular end wall plate 10 is welded in position about the flue 2 and to the end of the water tube 6.
  • the water tube 6 can be divided into sections, each section being connected and sealed in the manner described, with the diiference, however, that an upper section 6' is connected at its lower end to the snbjacent section 6 by means of a tube instead of to the boiler.
  • Such a connection is shown at 11 in the top half of the drawing where the shelf 9 for supporting the adjoining ends of the two water tube sections 6, 6' is disposed.
  • the lower end of the water tube can be connected to a separate emptying conduit equipped with a valve (not shown).
  • means for exploiting the flue gas heat comprising a hot water boiler
  • a jacket surrounding at least a part of said flue and defining together with said flue a water conduit to permit the return to the boiler of water in the hot water system

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Housings, Intake/Discharge, And Installation Of Fluid Heaters (AREA)
  • Incineration Of Waste (AREA)

Description

Jan.-3, 1967 P. H. RANEBO 3,295,503
' DEVICES FOR EXPLOITING THE FLUE GAS HEAT IN THE FLUE OF A HOT WATER BOILER Filed Jan. 8, 1965 United States Patent Ofiice Patented Jan. 3, 1957 3,295,503 DEVICES FOR EXPLOITING TIE FLUE GAS IEAT IN THE BLUE OF A HOT WATER BOILER Per Herman Ranebo, Rainge, Hassleholrn, Sweden Filed Jan. 8, 1965, Ser. No. 424,249
Claims priority, application Sweden, Mar. 7, 1964,
2,884/ 64 3 Claims. (Cl. 122-20) This invention has for its object to make it possible economically to exploit the flue gas heat in the flnes of hot water boilers for distributing hot water for instance to heating installations. The invention is characterized in that at least part of the flue is surrounded by a jacket which together with the flue defines a space which has its ends connected to a hot water return conduit and to the hot water boiler, respectively, so that it will form part of the water return conduit.
According to the invention, the device outlined in the foregoing constitutes both an eflicient heat exchanger for exploiting the heat contents of the flue gases and a device protecting the material in the flue, chimney and adjoining parts against overheating.
For better elucidation the invention will be described more in detail in the following, reference being bad to the accompanying drawing which diagrammatically shows a vertical sectional view of a chimney extending from a hot water boiler, and a conduit system mounted in the chimney for heat exchange between the flue gases and the return water to the boiler.
The flue 2 extends from the hot water 'boiler 1 horizontally into a brick base 3 with smoke box and smoke box door 4 and from said base 3 vertically upwardly through the chimney 5. The flue 2 is of a relatively small diameter as compared with the space of the chimney, which in the example shown is of a normal size for a small apartment house or detached house whereby an amply dimensioned free space is obtained between the inner side of the chimney and the flue 2 to accommodate an outer water tube 6 which is mounted in the chimney and surrounds the flue 2 in the manner of a water jacket throughout the greater part of the vertical length of the flue 2. The diameter of the outer water tube 6 is so much larger than that of the inner flue 2 that a sufliciently wide gap remains between the twotubes for leading the return water back to the boiler. In the example shown the inner tube 2 has a diameter of about 15 cm. and the outer tube 6 a diameter of about 20 cm. The width of the gap between the tubes then is about 2.5 cm., which has proved suflicient in normal cases.
The water passage between the two tubes, which is of annular section, is closed at the upper and lower ends and has these ends connected to the water return conduit 7 from the hot water system and to the water return tube 8 leading to the boiler, respectively. The lower end of the water conduit terminates at a level with the water return tube 8 and the upper end thereof at a level with or above the water return conduit 7 from the uppermost storey.
The outer water tube 6 can be supported at the lower end in a manner shown in the drawing on a shelf 9 which is built of bricks in the chimney or consists of holders secured therein. The seal between the upper and lower ends of the water tube 6 and the flue 2 is realized in that an annular end wall plate 10 is welded in position about the flue 2 and to the end of the water tube 6. According to the need, for instance in multi-storeyed buildings, the water tube 6 can be divided into sections, each section being connected and sealed in the manner described, with the diiference, however, that an upper section 6' is connected at its lower end to the snbjacent section 6 by means of a tube instead of to the boiler. Such a connection is shown at 11 in the top half of the drawing where the shelf 9 for supporting the adjoining ends of the two water tube sections 6, 6' is disposed.
To permit emptying of the outer water tube 6 independently of the water return tube 8 to the boiler, the lower end of the water tube can be connected to a separate emptying conduit equipped with a valve (not shown).
In practical use the device described in the foregoing has proved very eflicient in point of good fuel economy but it has also proved so effective as a heat protecting means around the flue that it is even possible to dispense with a brick chimney.
What I claim and desire to secure by Letters Patent is:
1. In combination with a hot water distribution system, means for exploiting the flue gas heat comprising a hot water boiler,
a flue passing through a chimney structureand connected to said hot water boiler to receive heat therefrom,
a jacket surrounding at least a part of said flue and defining together with said flue a water conduit to permit the return to the boiler of water in the hot water system,
a hot water return conduit connected from the hot water distribution system to the upper part of said water conduit,
and a water return pipe connected from said hot water boiler to the lower end of said water conduit whereby the return water from the hot water system is preheated by the flue gas heat before arrival in the boiler.
2. The combination as claimed in claim 1, wherein said jacket is the outer covering for said flue, being the chimney structure over the part of said flue surrounded by said jacket.
3. The combination as claimed in claim 1, wherein said chimney structure is formed of brick-like material around the outside surface of said jacket.
References Cited by the Examiner UNITED STATES PATENTS 121,973 12/1871 Till 122-20 357,992 2/ 1887 Hewitt 122-20 X 704,009 7/1902 Ebersole 122-20 866,842 9/ 1907 Comstock.
895,669 8/1908 Ogden 122-439 X 1,458,876 6/1923 Confer 122-20 CHARLES I. MYHRE, Primary Examiner.

Claims (1)

1. IN COMBINATION WITH A HOT WATER DISTRIBUTION SYSTEM, MEANS FOR EXPLOITING THE FLUE GAS HEAT COMPRISING A HOT WATER BOILER, A FLUE PASSING THROUGH A CHIMNEY STRUCTURE AND CONNECTED TO SAID HOT WATER BOILER TO RECEIVE HEAT THEREFROM, A JACKET SURROUNDING AT LEAST A PART OF SAID FLUE AND DEFINING TOGETHER WITH SAID FLUE A WATER CONDUIT TO PERMIT THE RETURN TO THE BOILER OF WATER IN THE HOT WATER SYSTEM, A HOT WATER RETURN CONDUIT CONNECTED FROM THE HOT WATER DISTRIBUTION SYSTEM TO THE UPPER PART OF SAID WATER CONDUIT, AND A WATER RETURN PIPE CONNECTED FROM SAID HOT WATER BOILER TO THE LOWER END OF SAID WATER CONDUIT
US424249A 1964-03-07 1965-01-08 Devices for exploiting the flue gas heat in the flue of a hot water boiler Expired - Lifetime US3295503A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2884/64A SE309837B (en) 1964-03-07 1964-03-07

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US3295503A true US3295503A (en) 1967-01-03

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DE (1) DE1579999A1 (en)
FI (1) FI42873B (en)
SE (1) SE309837B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4335850A (en) * 1980-06-16 1982-06-22 Kreps Ralph L Hot water heating system
US4502529A (en) * 1981-09-30 1985-03-05 Varney Paul R Heat recovery system
US20120090561A1 (en) * 2010-10-15 2012-04-19 Wen-Lo Chen Gas water heater with waste gas purification and filtration functions
US20130139492A1 (en) * 2010-05-26 2013-06-06 Heat Recovery Solutions Ltd. Heat exchange unit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US121973A (en) * 1871-12-19 Improvement in boilers for domestic purposes
US357992A (en) * 1887-02-15 Half to g
US704009A (en) * 1902-03-27 1902-07-08 John Ebersole Hot-water heating system.
US866842A (en) * 1903-06-01 1907-09-24 George S Comstock Hot-water heating system.
US895669A (en) * 1907-04-17 1908-08-11 William B Ogden Evaporating-pan.
US1458876A (en) * 1923-01-15 1923-06-12 Confer Joe Boiler and water heater

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US121973A (en) * 1871-12-19 Improvement in boilers for domestic purposes
US357992A (en) * 1887-02-15 Half to g
US704009A (en) * 1902-03-27 1902-07-08 John Ebersole Hot-water heating system.
US866842A (en) * 1903-06-01 1907-09-24 George S Comstock Hot-water heating system.
US895669A (en) * 1907-04-17 1908-08-11 William B Ogden Evaporating-pan.
US1458876A (en) * 1923-01-15 1923-06-12 Confer Joe Boiler and water heater

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4335850A (en) * 1980-06-16 1982-06-22 Kreps Ralph L Hot water heating system
US4502529A (en) * 1981-09-30 1985-03-05 Varney Paul R Heat recovery system
US20130139492A1 (en) * 2010-05-26 2013-06-06 Heat Recovery Solutions Ltd. Heat exchange unit
US9127580B2 (en) * 2010-05-26 2015-09-08 Heat Recovery Solutions Limited Heat exchange unit
US20150361856A1 (en) * 2010-05-26 2015-12-17 Heat Recovery Solutions Limited Heat exchange unit
US9551256B2 (en) * 2010-05-26 2017-01-24 Heat Recovery Solutions Limited Heat exchange unit
US20170122675A1 (en) * 2010-05-26 2017-05-04 Heat Recovery Solutions Limited Heat exchange unit
US10247487B2 (en) * 2010-05-26 2019-04-02 Heat Recovery Solutions Limited Heat exchange unit
US20120090561A1 (en) * 2010-10-15 2012-04-19 Wen-Lo Chen Gas water heater with waste gas purification and filtration functions

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Publication number Publication date
FI42873B (en) 1970-08-03
DE1579999A1 (en) 1970-04-30
SE309837B (en) 1969-04-08

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