US3824070A - Air heater with internal combustion chamber - Google Patents

Air heater with internal combustion chamber Download PDF

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Publication number
US3824070A
US3824070A US00345211A US34521173A US3824070A US 3824070 A US3824070 A US 3824070A US 00345211 A US00345211 A US 00345211A US 34521173 A US34521173 A US 34521173A US 3824070 A US3824070 A US 3824070A
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US
United States
Prior art keywords
combustion chamber
opening
air heater
hot gas
burner
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.)
Expired - Lifetime
Application number
US00345211A
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English (en)
Inventor
F Drebes
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.)
Dr C Otto and Co GmbH
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Dr C Otto and Co GmbH
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Filing date
Publication date
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B9/00—Stoves for heating the blast in blast furnaces

Definitions

  • This invention relates to an air heater incorporating an internal combustion chamber which is supplied with gas by a burner arranged ahead of the combustion chamber in the manner such that slide valves are used to terminate the flow of hot gas to the combustion chamber.
  • Air heaters with an internal combustion chamber have, operationally, been proven superior to air heaters with an externally arranged combustion chamber. With respect to an external combustion chamber, high stresses occur in the elongated cupola when cold air is injected into the chamber. Moreover, the brick lining of the cupola and the tight connection between the combustion chamber and the cupola present considerable technical problems.
  • an air heater comprising the combination including a burner for supplying combustion gases for the air heater, valve means for controlling the delivery of hot gas from the burner, an elbow having a refractory lining receiving gas from the burner, a combustion chamber for receiving gas discharged from the .elbow. the combustion chamber including a hot air discharge opening, and valve means for controlling the passage of air through said discharge opening.
  • the preferred embodiment of the present invention further includes a transition conduit member for conducting gas into the combustion chamber from the aforementioned elbow, and a water-cooled support ring at the interconnection between the elbow and the transition conduit member.
  • the invention further provides that the opening of the transition pipe at its upper end is matched to the crosssectional opening of the combustion chamber.
  • FIG. 1 is a sectional view taken vertically through a hot air heater arrangement according to the present invention
  • FIG. 2 is a sectional view taken FIG. 1;
  • FIG. 3 is a sectional view takenalong line III- -III of FIG. 1;
  • FIG. 4 is a sectional view taken along line IVIV of FIG. 1;
  • FIG. 5 is an enlarged sectional view taken along line V--V of FIG. 1;
  • FIG. 6 is an enlarged sectional view taken along lin VI-VI of FIG. 4.
  • FIG. 1 of the drawings there isillustrated an air heater provided with checkerwork 10 forming a refractory lining for the storage of heat within the walls 11 of the air heater.
  • the walls 11 are further defined by an outer metallic wall casing 12.
  • FIGS. 1 and 3 illustrate a collecting distributing chamber 13 located at the bottom of the heater.
  • This chamber is provided with connection pipes 14 for the exhaust of combustion gases into a conventional stack, not shown, and the provision of a connecting pipe 15 for the entry of air to be heated by the heater and then drawn off through a combustion chamber 16 by way of pipe 15A.
  • the hot air leaves the combustion chamber 16 by passing through an opening 17 forming a stream or blast of hot air.
  • a water-cooled slide valve 18 may be controlled to block the flow of hot air through the pipe 15A.
  • the floor of the combustion chamber has a hot gas discharge opening 19 underlying the hot air exhaust opening 17 whereby hot gases entering the combustion along line II-II (3f chamber through the opening 19 are thoroughly mixed with the hot air for enhancing combustion within the chamber.
  • a transition piece in the form of a coupling member 20 is lined with refractory material for the discharge of hot gases into the opening 17.
  • the coupling member is attached at one end to the combustion chamber and has at the other end a thermal barrier provided by a water-cooled support ring 21 which is illustrated in greater detail in FIGS. 5 and 6.
  • the water-cooled support ring has an internal chamber supplied with water by pipes 21A spaced about the periphery of the ring where there is also provided drain lines 21B for the circulation of water through the chamber and the ring.
  • an elbow 22 Arranged below the coupling member for engagement with the lower surface of the coolant ring 21 there is an elbow 22 which is also lined with refractory material.
  • the elbow has a horizontal leg 22a extending toward a burner 24 which engages a support 25.
  • a water-cooled, hot gas slide valve 23 forms the interconnection between the burner 24 and the elbow 22.
  • An inlet pipe 26 supplies hot gas to the burner 24 and a pipe 27 supplies air to the burner.
  • the horizontal axis of the burner extends in a direction such that it forms an acute angle with the overlying horizontal axis of the pipe 15A.
  • This air heater arrangement brings about many useful advantages which include preventing excess thermal stressing of the various parts in the combustion chamber.
  • the length of the combustion chamber in a series arrangement of the burner is sufficient for complete combustion of the gases used for heating. A more uniform burning of the gaseous mixture is accomplished for the air heaters in the case of a cupola.
  • the burner is made readily accessible from the outside whereby it can be easily exchanged and replaced without undue delays.
  • the burners may be built from metal parts even when very high combustion temperatures inside the combustion chamber are to be obtained.
  • An air heater apparatus comprising, a combustion chamber having an exhaust opening for discharging heated air from said chamber, first valve means for blocking the flow of hot air exhausted through said opening from said combustion chamber, a burner disposed remote to said combustion chamber for discharging hot gases through an opening in said combustion chamber located below said exhaust opening, second valve means for blocking the flow of hot gas between said burner to said combustion chamber, and
  • elbow means having a refractory lining for the delivery 2.
  • said first and second valve means are each further defined to include a hot air slide valve and a hot gas slide valve, respectively.
  • said combustion chamber includes a hot gas discharge opening in a wall defining said combustion chamber at a point located above said inlet opening, said apparatus further comprising a coupling member for conducting hot gas to said opening in the combustion chamber located below said exhaust opening, and a fluid-cooled support ring for providing a thermal barrier at the interconnection between said coupling member and said elbow means.
  • the air heater apparatus further comprising a coupling member having an internal opening for conducting hot gas to said combustion chamber, said thermal insulation extending between said elbow and said coupling member.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)
US00345211A 1972-05-13 1973-03-26 Air heater with internal combustion chamber Expired - Lifetime US3824070A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2223442A DE2223442C3 (de) 1972-05-13 1972-05-13 Winderhitzer mit innen liegendem Brennschacht

Publications (1)

Publication Number Publication Date
US3824070A true US3824070A (en) 1974-07-16

Family

ID=5844824

Family Applications (1)

Application Number Title Priority Date Filing Date
US00345211A Expired - Lifetime US3824070A (en) 1972-05-13 1973-03-26 Air heater with internal combustion chamber

Country Status (5)

Country Link
US (1) US3824070A (en(2012))
JP (1) JPS5441007B2 (en(2012))
BE (1) BE799287A (en(2012))
DE (1) DE2223442C3 (en(2012))
FR (1) FR2184666B1 (en(2012))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947245A (en) * 1974-07-15 1976-03-30 Koppers Company, Inc. Hot blast stove
US4078776A (en) * 1975-09-29 1978-03-14 Hoogovens Ijmuiden, B.V. Support construction for a horizontal conduit, which is connected to a vessel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1656542A (en) * 1926-05-31 1928-01-17 Askania Werke Ag Burner for air heaters
US1689042A (en) * 1926-08-09 1928-10-23 Frank R Mcgee Hot-blast stove
US1825259A (en) * 1926-11-26 1931-09-29 Herman A Brassert Apparatus for heating air and other gases for industrial uses
US3642262A (en) * 1969-01-16 1972-02-15 Koninklijke Hoogovens En Staal Method for operating a regenerative gas heater, and a gas heater for use in this method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE389745C (de) * 1921-02-06 1924-02-13 Wilhelm Vedder Feuerungsanlage fuer Winderhitzer
US3024014A (en) * 1958-11-25 1962-03-06 Koppers Co Inc Hot blast stoves

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1656542A (en) * 1926-05-31 1928-01-17 Askania Werke Ag Burner for air heaters
US1689042A (en) * 1926-08-09 1928-10-23 Frank R Mcgee Hot-blast stove
US1825259A (en) * 1926-11-26 1931-09-29 Herman A Brassert Apparatus for heating air and other gases for industrial uses
US3642262A (en) * 1969-01-16 1972-02-15 Koninklijke Hoogovens En Staal Method for operating a regenerative gas heater, and a gas heater for use in this method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947245A (en) * 1974-07-15 1976-03-30 Koppers Company, Inc. Hot blast stove
US4078776A (en) * 1975-09-29 1978-03-14 Hoogovens Ijmuiden, B.V. Support construction for a horizontal conduit, which is connected to a vessel

Also Published As

Publication number Publication date
DE2223442B2 (de) 1977-08-11
BE799287A (fr) 1973-08-31
DE2223442C3 (de) 1978-04-06
JPS5441007B2 (en(2012)) 1979-12-06
FR2184666A1 (en(2012)) 1973-12-28
DE2223442A1 (de) 1973-11-22
FR2184666B1 (en(2012)) 1976-11-12
JPS4924809A (en(2012)) 1974-03-05

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