US3863906A - Recovery of combustible gases from furnaces in general and more particularly from converters - Google Patents

Recovery of combustible gases from furnaces in general and more particularly from converters Download PDF

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Publication number
US3863906A
US3863906A US336815A US33681573A US3863906A US 3863906 A US3863906 A US 3863906A US 336815 A US336815 A US 336815A US 33681573 A US33681573 A US 33681573A US 3863906 A US3863906 A US 3863906A
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United States
Prior art keywords
combustion chamber
mouth
air
exhaust conduit
gases
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Expired - Lifetime
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US336815A
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English (en)
Inventor
Pierre Georges Vicard
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Societe'lab'fr197203037208901
SOC LAB SARL
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SOC LAB SARL
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust

Definitions

  • the present invention relates to the recovery of combustible gases from furnaces in general and more particularly from converters such as those used in the steel industry and in which the metal in treated by air or preferably by substantially pure oxygen.
  • the air induced into the auxiliary duct or ducts is only mixed with the combustible gases within a combustion chamber located at the end of the exhaust conduit remote from the furnace mouth.
  • FIG. 1 is a diagrammatical view with parts in section, illustrating a plant according to the invention.
  • FIG. 2 is a fragmental longitudinal section of the exhaust conduit in the plant of FIG. 1.
  • FIG. 3 is an enlarged cross-section taken along line Ill-Ill of FIG. 2.
  • FIGS. 4 and 5 are fragmental views similar to FIG. 1, but illustrating modifications.
  • reference numeral 1 designates a converter rockable about an axis in the conventional manner, between three different positions, namely a vertical operating position illustrated in full lines, a loading position la and a pouring position lb both indicated in dash lines.
  • a vertical operating position illustrated in full lines
  • a loading position la a loading position la
  • a pouring position lb both indicated in dash lines.
  • the upper mouth of the converter receives a lance 2 through which oxygen is injected into the molten metal.
  • a considerable quantity of combustible dust-laden carbon monoxide then exhausts at a quite high temperature from the converter mouth and should be recovered.
  • the conventional protective hood 3 provided above the converter mouth at the oxygen injecting position comprises the inlet end of an appropriately water-cooled exhaust conduit 4 the other end of which opens into a combustion chamber Slocated at a distance from the converter.
  • This chamber is preferably formed of a gas furnace associated with a steam boiler of any description.
  • the relatively cooled burnt gases from chamber 5 reach a dust collecting filter 6 and they are discharged outwardly through a chimney 7 by a blower 8.
  • exhaust conduit 4 The inlet end of exhaust conduit 4 is surrounded by an annular wall 9 which defines an annular duct I0 opening above the converter mouth. This duct is connected with the outlet of blower 8 by means of a conduit 11 provided with an appropriate valve device 12.
  • annular wall 9 is in turn surrounded by another annular wall 13 which defines with wall 9 another annular duct 14 connected through valves such as 15 with an upper air collecting chamber 16.
  • the latter is itself connected with the low pressure side of an air blower 18 the high pressure side of which is connected with the combustion chamber 5 by a conduit 19.
  • duct 14, chamber 16, conduits l7 and 19 form an auxiliary air conduit through which ambient air may be forced into the combustion chamber for burning the combustible gases supplied by the exhaust conduit 4.
  • a first lateral auxiliary hood 20 is disposed above the loading position la of the converter mouth, this hood being connected with the air collecting chamber 16 through valves such as 21.
  • Another auxiliary lateral hood 22 is disposed above the pouring position lb of the converter mouth and it is also connected with air chamber 16 through valves such as 23.
  • blower 18 should supply the quantity of comburent air required for completaly burning the gases issuing from the converter and blower 8 should be so adjusted to collect all the gases generated by the converter.
  • the burnt gases issuing from the combustion chamber 5 are preferably further cooled as for instance by water jets within the dust filter 6.
  • a portion of the cooled and filtered gases is derived through conduit 11 and valve 12 and it is thus caused to flow through duct 10 at the outlet of which it forms around the mouth of the converter and the inlet end of exhaust conduit 4 an inert gaseous screen which prevents any ingress of comburent air into the exhaust conduit and any ingress of combustible gas into the auxiliary air duct.
  • the gases which form this screen are collected in part by conduit 4, in part by duct 14.
  • the lance 2 is withdrawn and the converter is rocked to position lb (pouring step). Valves 15 are closed and valves 23 are open. The residual dust-laden gases issuing from the furnace mouth are then collected by the second auxiliary hood 22 together with ambient air and are forced into the combustion chamber which preferably comprises a pilot burner.
  • the converter is thereafter brought to the loading position la in order to receive a fresh load of molten metal.
  • valves 23 are closed and valves 21 are open, the gases and fumes from the converter being therefore recovered by the first lateral hood 20.
  • FIGS. 2 and 3 illustrate a particular arrangement of the exhaust conduit 4.
  • the latter is cooled in the conventional manner by means of a water jacket in an intermediate annular space 25 defined by two spaced walls 4a and 4b, the cooling water being injected tangentially into this intermediate space, as for instance by a number of nozzles such as 24.
  • the rotational movement of the water layer is of advantage for an efficient cooling but that in actual practice this movement disappears rapidly along the conduit. This is due to the fact that in the bends the velocity of the water mass is irregular, which generates whirls.
  • This is avoided in FIGS. 2 and 3 by increasing the radial width of the annular space 25 in a manner more or less inversely proportional to the radius of curvature of the bend.
  • the rotational velocity may thus be maintained substantially constant and therefore the rotating movement extends up to the combustion chamber along the whole length of the conduit.
  • FIG. 4 illustrates a modification wherein the cooled and filtered gases recycled through conduit 11 and duct are no more used for forming an inert screen, but are introduced into the inlet end of the exhaust conduit 4 through holes 10a in order to form a relatively cool protective layer against the wall of the latter, the lower end of duct 10 being closed.
  • FIG. 5 shows another modification wherein the recycled gases are introduced into the inlet air duct 14 through holes 10b, the lower end of duct 10 being here again closed.
  • This admission of inert gases into the auxiliary air conduit and into the combustion chamber 5 permits of reducing the quantity of comburent air in the said chamber, when required, by merely acting on valve 12.
  • FIGS. 1, 4 and 5 could be combined, if desired.
  • a plant for the recovery of combustible gases issuing from the mouth of furnaces in general and more particularly of converters comprising:
  • auxiliary air conduit having an annular inlet located around the inlet of said exhaust conduit above the furnace mouth to withdraw ambient air from the perimeter of said mouth, and an outlet end opening into said combustion chamber to sup ply same with comburent air to cause combustion of said combustible gases within said combustion chamber, thus producing burnt gases therein;
  • said gas propelling means comprising a first blower having its low pressure side connected with said combustion chamber;
  • said air propelling means being formed of a second blower disposed in said auxiliary air conduit.
  • a plant for the recovery of combustible gases issuing from the mouth of furnaces in general and more 5 particularly of converters comprising:
  • an exhaust conduit having an inlet end and an outlet end, with said inlet end being disposed above the furnace mouth to collect combustible gases issuing therefrom;
  • auxiliary air conduit having an annular inlet located around the inlet of said exhaust conduit above the furnace mouth to withdraw. ambient air from the perimeter of said mouth,- and an outlet end opening into said combustion chamber to supply same with comburent air to cause combustion of said combustible gases with said combustion chamber, thus producing burnt gases therein;
  • annular gas recycling duct disposed between the inlet end of said exhaust conduit and the annular inlet of said auxiliary air conduit, said duct also opening above the furnace mouth;
  • valve means to selectively connect said auxiliary air conduit respectively with the annular inlet of same, with said first auxiliary hood or with said second auxiliary hood.
  • a plant for the recovery of combustible gases issuing from the mouth of furnaces in general and more particularly of converters comprising:
  • an exhaust conduit having an inlet end and an outlet end, with said inlet end being disposed above the furnace mouth to collect combustible gases issuing therefrom;
  • a combustion chamber separate from said exhaust conduit with the outlet end of said exhaust conduit opening into said chamber
  • an auxiliary air conduit having an annular inlet located around the inlet of said exhaust conduit above the furnace mouth to withdraw ambient air from the perimeter of said mouth, and an outlet end opening into said combustion chamber to supply same with comburent air to cause combustion of said combustible gases within said combustion chamber, thus producing burnt gases therein; means to discharge outwardly said burnt gases from said combustion chamber;
  • said exhaust conduit being formed with at least one bent portion having a radius of curvature and being double walled to define a cooling water jacket, with the width of said water jacket being substantially inversely proportional to the radius of curvature of said bent portion, and said plant further comprising means to inject water tangentially into said water jacket.
  • a plant for the recovery of combustible gases issuing from the mouth of furnaces in general and more particularly of converters, comprising:

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
US336815A 1972-03-09 1973-02-28 Recovery of combustible gases from furnaces in general and more particularly from converters Expired - Lifetime US3863906A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7208901A FR2177484B1 (ja) 1972-03-09 1972-03-09

Publications (1)

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US3863906A true US3863906A (en) 1975-02-04

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US336815A Expired - Lifetime US3863906A (en) 1972-03-09 1973-02-28 Recovery of combustible gases from furnaces in general and more particularly from converters

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US (1) US3863906A (ja)
JP (1) JPS5248572B2 (ja)
AT (1) AT336054B (ja)
BE (1) BE796482A (ja)
ES (1) ES412454A1 (ja)
FR (1) FR2177484B1 (ja)
GB (1) GB1403125A (ja)
IT (1) IT982497B (ja)
NL (1) NL7303102A (ja)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3976454A (en) * 1974-02-20 1976-08-24 Gottfried Bischoff Bau Kompl. Gasreinigungsund Wasserruckkuhlanlagen Kommandigesellschaft Exhaust system for steel-making plant
US4031819A (en) * 1976-01-07 1977-06-28 American Air Filter Company, Inc. Apparatus for collecting and conveying of fumes from a furnace
US4040608A (en) * 1974-10-29 1977-08-09 Vicard Jean Francois Method for the recovery of gases coming from refining furnaces
US4050682A (en) * 1975-03-31 1977-09-27 Pennsylvania Engineering Corporation Method and apparatus for handling off-gases from metal refining vessel
US4072299A (en) * 1976-04-27 1978-02-07 Albert Calderon Method and apparatus for basic oxygen steel making employing the off-gas principle of pre-heating purposes
US4099709A (en) * 1977-01-12 1978-07-11 Albert Calderon Method and apparatus for controlling emissions from oxygen steelmaking furnaces
US4234170A (en) * 1979-06-06 1980-11-18 National Steel Corporation Movable charging emissions control hood for BOF
US4253644A (en) * 1978-12-04 1981-03-03 Inland Steel Company Fluid closure for and method of preventing flow through an opening in a fluid and particulate confining and conveying structure
US20070221199A1 (en) * 2006-03-24 2007-09-27 Duke Manufacturing Co. Vent system for cooking appliance

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5636910Y2 (ja) * 1976-09-10 1981-08-31
FR2365381A1 (fr) * 1976-09-22 1978-04-21 Gatx Fuller Hotte perfectionnee pour le captage de gaz ou fumees
FI60610C (fi) * 1980-06-19 1982-02-10 Outokumpu Oy Saett att blanda en het ugnsgas med en annan gas foere avlaegsning av ugnsgasen fraon ugnen samt huv doerfoer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3154406A (en) * 1959-01-28 1964-10-27 Siderurgie Fse Inst Rech Exhaust for steel converter
US3357820A (en) * 1964-02-11 1967-12-12 Waagner Biro Ag Method of and installation for the utilization of hot waste gases from furnaces of metallurgical works
US3372917A (en) * 1965-08-16 1968-03-12 Chemical Construction Corp Apparatus for recovery of converter off-gases
US3727587A (en) * 1971-11-17 1973-04-17 Treadwell Corp System for recovering waste heat from copper converters

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3154406A (en) * 1959-01-28 1964-10-27 Siderurgie Fse Inst Rech Exhaust for steel converter
US3357820A (en) * 1964-02-11 1967-12-12 Waagner Biro Ag Method of and installation for the utilization of hot waste gases from furnaces of metallurgical works
US3372917A (en) * 1965-08-16 1968-03-12 Chemical Construction Corp Apparatus for recovery of converter off-gases
US3727587A (en) * 1971-11-17 1973-04-17 Treadwell Corp System for recovering waste heat from copper converters

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3976454A (en) * 1974-02-20 1976-08-24 Gottfried Bischoff Bau Kompl. Gasreinigungsund Wasserruckkuhlanlagen Kommandigesellschaft Exhaust system for steel-making plant
US4040608A (en) * 1974-10-29 1977-08-09 Vicard Jean Francois Method for the recovery of gases coming from refining furnaces
US4050682A (en) * 1975-03-31 1977-09-27 Pennsylvania Engineering Corporation Method and apparatus for handling off-gases from metal refining vessel
US4031819A (en) * 1976-01-07 1977-06-28 American Air Filter Company, Inc. Apparatus for collecting and conveying of fumes from a furnace
US4072299A (en) * 1976-04-27 1978-02-07 Albert Calderon Method and apparatus for basic oxygen steel making employing the off-gas principle of pre-heating purposes
US4099709A (en) * 1977-01-12 1978-07-11 Albert Calderon Method and apparatus for controlling emissions from oxygen steelmaking furnaces
US4103879A (en) * 1977-01-12 1978-08-01 Albert Calderon Apparatus for controlling emissions from oxygen steelmaking furnaces
US4253644A (en) * 1978-12-04 1981-03-03 Inland Steel Company Fluid closure for and method of preventing flow through an opening in a fluid and particulate confining and conveying structure
US4234170A (en) * 1979-06-06 1980-11-18 National Steel Corporation Movable charging emissions control hood for BOF
US20070221199A1 (en) * 2006-03-24 2007-09-27 Duke Manufacturing Co. Vent system for cooking appliance

Also Published As

Publication number Publication date
GB1403125A (en) 1975-08-13
FR2177484B1 (ja) 1974-08-30
DE2311527A1 (de) 1973-09-13
IT982497B (it) 1974-10-21
FR2177484A1 (ja) 1973-11-09
AT336054B (de) 1977-04-12
JPS5248572B2 (ja) 1977-12-10
NL7303102A (ja) 1973-09-11
JPS48102705A (ja) 1973-12-24
ES412454A1 (es) 1976-01-01
BE796482A (fr) 1973-07-02
DE2311527B2 (de) 1976-12-09
ATA179473A (de) 1976-08-15

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