US3477701A - Hot-blast stoves - Google Patents

Hot-blast stoves Download PDF

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Publication number
US3477701A
US3477701A US630683A US3477701DA US3477701A US 3477701 A US3477701 A US 3477701A US 630683 A US630683 A US 630683A US 3477701D A US3477701D A US 3477701DA US 3477701 A US3477701 A US 3477701A
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US
United States
Prior art keywords
gas
chamber
heat accumulating
hot
blast
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
US630683A
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English (en)
Inventor
Ryo Ando
Teruo Shimotsuma
Kanichiro Chihara
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.)
JFE Engineering Corp
Original Assignee
Nippon Kokan Ltd
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
Application filed by Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
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Publication of US3477701A publication Critical patent/US3477701A/en
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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
    • 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
    • F28D17/00—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles
    • 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
    • F28D17/00—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles
    • F28D17/005—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles using granular particles

Definitions

  • a hot-blast stove including a gas c-ombustion chamber and a heat accumulating chamber interconnected by a dome at the top.
  • a flow-resistance means is situated in the dome to provide uniform ow of combustion gases or hot air. Further a concave air baille is provided at the bottom of the heat accumulating chamber to prevent biased flow of ⁇ cold air therein.
  • the flow-resistance means may take a number of forms such as a pile of spherical. members.
  • This invention relates to hot-blast stoves.
  • Cowper type hotblast stove a vertical furnace is divided into a combustion Mice chamber and a checkerwork heat accumulating chamber which communicate with each other at the top or dome of the stove.
  • hot blast-furnace gas ows upwardly through the combustion chamber, reverses its direction of flow in the dome, and then flows downwardly in the heat accumulating chamber containing the checker bricks.
  • cold air introduced into the bottom of the heat accumulating chamber blows upwardly therethrough, reverses its direction of ow in the dome, and then. flows downwardly through the combustion chamber.
  • Such reversal of the direction of ow of the gas causes the gas to ow along one side of the combustion chamber or heat accumulating chamber and hence results in non-uniform temperature distribution as well as in a decrease in the eciency of heat exchange.
  • One of the objects of the invention is to provide in a hot-blast stove associated with a blast furnace a uniform ow of combustion gas and air owin-g into the heat accumulating chamber, to improve the heat exchange eiciency thereof by increasing the eiective heat receiving area.
  • Another object of this invention is to provide for blast furnaces hot-blast stoves wherein the efficiency of heat exchange in the heat accumulating chamber is increased by increasing the effective heat receiving area.
  • Conventional hot-blast stoves for use with blast furnaces comprise a combustion chamber, a heat accumulating chamber, a partition wall between the chambers, a dome at the top to interconnect the combustion and heat accumulating chambers, means to supply combustion gas to the combustion chamber, means to exhaust hot air from the combustion chamber, and a bottom plenum chamber at the ⁇ bottom of the heat accumulating chamber to admit cold air into and to exhaust combustion gas from the heat accumulating chamber, the heat accumulating chamber acting to store heat from combustion of the blast-furnace gas during on-gas operation and to heat cold air by giving up its stored heat thereto during onwind operation, so as to supply hot air to the blast furnace through the combustion chamber.
  • a flowresistance means is non-uniformly distributed in the dome to increase the uniformity in the distribution of the flow of gas for preventing one-sided flow thereof.
  • the resistance means may take a number of forms such as a pile of spherical members of a refractory material.
  • Another feature of this invention resides in the provision of a concave air baffle in the bottom plenum chamber of the heat accumulating chamber to assure uniform ow of cold air therethrough.
  • Yet another feature is to provide at least one perforation through the wall of the dome on the side opposite to the heat accumulating chamber to form a layer of cold air for enhancing deflection of the gas flow in the dome.
  • FIG. 1 is a longitudinal cross-sectional view of an embodiment of a hot-blast stove constructed in accordance with the invention.
  • FIG. 2 is a cross-sectional view of two forms of brick supporting posts.
  • each installation includes three hot-blast stoves, one of which is on-wind, supplying hot air to the blast furnace, while the other two are on-gas for combustion and heat accumulation.
  • the temperature of the hot air supplied from a particular stove is controlled by controlling the quantity of cold air supplied thereto, but when the temperature of hot air decreases to a predetermined value, the supply of hot air is interrupted and the operation of the furnace is switched to on-gas while at the same time one of the remaining stoves is switched to on-wind. The remaining stove continues its on-gas operation and will be switched to on-wind at the next switching. In this manner the switching cycle is repeated for the three hot-blast stoves.
  • a valve 1 at the bottom of the combustion chamber 2 is opened to admit a mixture of fuel gas and combustion air into the combustion chamber 2 to cause the mixture to burn therein.
  • the combustion gas passes to a heat accumulating chamber 4 through the top of the stove where a dome 3 is situated, whereby the heat of the combustion gas is given to and accumulated by heat accumulating checkerbricks (not shown) in the chamber 4.
  • the combustion gas is exhausted by way of open valve -6 to a flue 7 through bottom plenum chamber in which are installed a plurality of posts 12a, 12b (FIG.
  • both cold air valve 8 and hot blast valve 9 are in their closed positions at this time.
  • the Valve 1 is closed to stop the flow of fuel gas and combustion air, and the cold air valve 8 is opened to admit cold air to the bottom of heat accumulating chamber 4 through the bottom plenum chamber S. The air is heated by the heat stored in the checkerwork and the hot blast is delivered to a hot-blast valve 9 which has been opened.
  • a pile of spherical members 10 of a refractory material having large heat capacity is contained in the upper portion of the heat accumulating chamber 4 to enhance the change of Vthe direction of ow of gas inside the dome 3 and to increase the uniformity in the distribution of the gas ilow.
  • the members 10 form a pile of ow resistance bodies forming haphazard passages in the pile.
  • the pile is positioned on top of the heat accumulating chamber and within the dome.
  • the dome has a downwardly concave inner surface.
  • the pile gradually increases in depth from the partition Wall away from the combustion chamber up to the inner surface of the dome, as is apparent from the upper portion of FIG. 1.
  • At least one perforation l1 is provided through the Wall of the dome to form a layer of gas such as cold air.
  • This arrangement prevents biased or one-sided flow of combustion gas ilowing from the combustion chamber 2 into the heat accumulating chamber, and in addition the flow of gas is nonuniformly resisted to produce uniform ow.
  • a concave air baille 12 is provided in the bottom plenum chamber 5 in which are installed posts 12a, 12b (FIG. 2) for supporting ⁇ bricks in the heat accumulating chamber, to further prevent biased flow of cold air flow into the heat accumulating chamber.
  • a plurality of spaced posts 12a of triangular cross-section and posts 12b of circular cross-section are provided in the bottom plenum chamber 5 to resist the ow of combustion gas and cold air flowin-g into and out of the heat accumulating chamber.
  • the present invention provides a hot-blast stove for blast furnaces wherein the flow of combustion gas and cold air is changed near the dome at the top of the stove and in the bottom plenum chamber at the bottom of the heat accumulating chamber, in which posts for supporting bricks are provided, to greatly improve the thermal eciency of the heat accumulating chamber which is one of the essential elements of the hot-blast stove. Consequently, it is possible to increase the temperature of the hot-blast, save fuel consumption and prevent burning of bricks at the dome as well as leakage of gas between the combustion and heat accumulating chambers. Moreover, the distribution achieved with the hot-blast stove of the present invention is simple and cheap. Existing hot-blast stoves can be readily modified in accordance with the invention to improve their efficiency.
  • a hot-blast stove a combustion chamber, a heat accumulating chamber, a partition wall between said chambers, a dome at the top of and interconnecting said combustion chamber and said heat accumulating chamber, and a plurality of flow-resistance bodies non-uniformly distributed in said dome and delining between themselves spaces for increasing the uniformity in the distribution of the flow of gas to prevent one-sided ow thereof, said flow-resistance bodies comprising a pile of members of a refractory material forming haphazard passages therein, saidpile being positioned on top of said heat accumulating chamber and within said dome, said dome having a downwardly conc-ave inner surface and said pile gradually increasing in depth from said partition wall away from said combustion chamber up to the inner surface of said dome.
  • a bottom plenum chamber beneath said heat accumulating chamber and an air baille in said bottom plenum chamber extending across the latter and having an upwardly directed concave surface situated from said heat accumulating chamber by a distance which gradually increases from one side to an opposite side of said plenum chamber for preventingI biased flow of cold air into said heat accumulating chamber.
US630683A 1966-04-16 1967-04-13 Hot-blast stoves Expired - Lifetime US3477701A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2380266 1966-04-16
JP1901267 1967-03-28

Publications (1)

Publication Number Publication Date
US3477701A true US3477701A (en) 1969-11-11

Family

ID=26355802

Family Applications (1)

Application Number Title Priority Date Filing Date
US630683A Expired - Lifetime US3477701A (en) 1966-04-16 1967-04-13 Hot-blast stoves

Country Status (4)

Country Link
US (1) US3477701A (xx)
BE (1) BE696997A (xx)
DE (1) DE1533861B1 (xx)
GB (1) GB1176526A (xx)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4311456A (en) * 1980-07-18 1982-01-19 Bricmont & Associates, Inc. Blast furnace stove
EP0527306A1 (de) * 1991-08-13 1993-02-17 Didier-Werke Ag Regenerator
US20090056705A1 (en) * 2007-08-30 2009-03-05 Suncue Company Ltd Combustion system
US20090211539A1 (en) * 2008-02-26 2009-08-27 Ex-Tar Technologies, Inc. Reaction chamber for a direct contact rotating steam generator
CN107955852A (zh) * 2017-12-27 2018-04-24 中冶京诚工程技术有限公司 四段式顶燃热风炉
CN111795499A (zh) * 2020-07-14 2020-10-20 郑州釜鼎热能技术有限公司 一种高速对冲旋流可调预混蓄热体回流高温燃烧的热风炉
USD973854S1 (en) * 2016-02-12 2022-12-27 Zakrytoye Akcionernoye Obschestvo “Kalugin” Hot stove for blast furnace

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1461357A (en) * 1922-06-27 1923-07-10 Fred E Kling Hot-blast stove
US1799856A (en) * 1928-06-14 1931-04-07 Frank R Mcgee Furnace regenerator
US2768822A (en) * 1951-10-08 1956-10-30 Frey Kurt Paul Hermann Regenerative air heater
US3033544A (en) * 1958-03-12 1962-05-08 Didier Werke Ag Hot-blast stoves
US3241823A (en) * 1963-12-11 1966-03-22 Licencia Talalmanyokat Air-heater cupola constructions

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE679578C (de) * 1936-05-20 1939-08-09 Ernst Diepschlag Einrichtung zur selbsttaetigen Regelung der Verteilung des Heizgasstromes ueber Gitterwerke von Waermespeichern
DE927094C (de) * 1951-10-12 1955-04-28 Kurt Dr-Ing Frey Regenerativer Winderhitzer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1461357A (en) * 1922-06-27 1923-07-10 Fred E Kling Hot-blast stove
US1799856A (en) * 1928-06-14 1931-04-07 Frank R Mcgee Furnace regenerator
US2768822A (en) * 1951-10-08 1956-10-30 Frey Kurt Paul Hermann Regenerative air heater
US3033544A (en) * 1958-03-12 1962-05-08 Didier Werke Ag Hot-blast stoves
US3241823A (en) * 1963-12-11 1966-03-22 Licencia Talalmanyokat Air-heater cupola constructions

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4311456A (en) * 1980-07-18 1982-01-19 Bricmont & Associates, Inc. Blast furnace stove
EP0527306A1 (de) * 1991-08-13 1993-02-17 Didier-Werke Ag Regenerator
US20090056705A1 (en) * 2007-08-30 2009-03-05 Suncue Company Ltd Combustion system
US20090211539A1 (en) * 2008-02-26 2009-08-27 Ex-Tar Technologies, Inc. Reaction chamber for a direct contact rotating steam generator
US7814867B2 (en) * 2008-02-26 2010-10-19 Ex-Tar Technologies, Inc. Reaction chamber for a direct contact rotating steam generator
USD973854S1 (en) * 2016-02-12 2022-12-27 Zakrytoye Akcionernoye Obschestvo “Kalugin” Hot stove for blast furnace
CN107955852A (zh) * 2017-12-27 2018-04-24 中冶京诚工程技术有限公司 四段式顶燃热风炉
CN111795499A (zh) * 2020-07-14 2020-10-20 郑州釜鼎热能技术有限公司 一种高速对冲旋流可调预混蓄热体回流高温燃烧的热风炉

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Publication number Publication date
DE1533861B1 (de) 1972-03-09
BE696997A (xx) 1967-09-18
GB1176526A (en) 1970-01-07

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