US3352088A - Method for drawing off converter gases - Google Patents

Method for drawing off converter gases Download PDF

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Publication number
US3352088A
US3352088A US47654565A US3352088A US 3352088 A US3352088 A US 3352088A US 47654565 A US47654565 A US 47654565A US 3352088 A US3352088 A US 3352088A
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United States
Prior art keywords
converter
gases
waste
suction
air
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Expired - Lifetime
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English (en)
Inventor
Hoff Hans Suitbert
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Beteiligungs und Patentverwaltungs GmbH
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Beteiligungs und Patentverwaltungs GmbH
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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 a method for drawing oif, separating dust from, and, if desired, utilizing the converter gase which are formed during a refining process in which oxygen is blown into the iron.
  • the system may be provided with an open and cooled gas collector dome or hood which is arranged above the mouth of the converter and which is provided with means for producing an annular curtain of air, the suction of this hood being adjusted during the oxygen blowing phase by means of a suction blower, so that the suction is correlated with the amount of gas which is developed in the converter.
  • the raw converter gases are then burned off in a waste-heat boiler, i.e., a boiler in which the heat of the waste gases is utilized.
  • the gases are then cleaned or scrubbed in a dust separator, the same being constituted by a differential pressure scrubber. Both the suction blower and the differential pressure scrubber have to be regulated, depending on the amount of converter gases.
  • this constant suction output has to be adapted to the conditions prevailing at the instant at which the maximum carbon has to be burned oif, which occurs at the time the amount of waste gases issuing from the converter is at a maximum. It is not absolutely necessary that the quantity of gas withdrawn by the suction blower be made exactly equal to the amount of gas issuing from the converter, because if, for example, there is an excess of air, the increase in the volume of the gas causes the dust separator to pick up more steam, as a result of which no further air will be taken in, provided the blower continues to produce a constant suction. In this way, the cooled gas collector hood, which provides the annular curtain of air, can be dispensed with.
  • Another advantage of the installations which operate with unregulated combustion of the converter gases is that the complicated and expensive regulating systems which control the suction blowers and the differential pressure scrubbers can be eliminated. Also, the elimination of these regulating systems substantially reduces the power consumption of the installation as a whole.
  • one major drawback of such unregulated installations resides in the large amount of waste gases which are produced and which, if a waste boiler of the same size is to be heated, makes it necessary to provide a relatively very large dust separator. This, in turn, increases the initial costs of the installation as well as it operating expense, and at the same time decreases the amount of steam which can be generated.
  • the primary object of the present invention to provide a method of the above type which overcomes the disadvantages of the known systems and which combines their advantages. That is to say, the major object of the present invention is to provide a method which involves a structurally simple system, free of any regulating means, and which is, therefore, capable of being built at low initial cost.
  • Example 1 Waste gases in the amount of 8 m. NTP per minute per ton of pig iron arise in a converter if a minimum amount of air enters the mouth of the converter and if the carbon content of the pig iron is burnt with a maximum combustion rate of 0.4% per minute.
  • the suction blower operates at this amount of waste-gases which is constant during the whole oxygen blowing period. If an amount of 4% carbon of the pig iron is burnt and the temperature behind the waste-heat boiler is 1,000 C. then the wasteheat boiler produces 0.9 ton of steam per ton of pig iron.
  • the differential pressure-type scrubber operates with a differential pressure of 1,000 mm. of water, whereby an amount of 1 to 2 litres of water per m. NTP of gas is injected. The waste-gases contain then less than 0.1 g. dust per 111. NTP of gas.
  • Example 2 The following data are obtained if 62 tons of pig iron are refined in an oxygen-converter and if the carbon content of the pig iron is burnt with a maximum combustion rate of 0.5% per minute. The data are:
  • Waste-heat boilers used for the process according to the present invention are generally known and described for example in Special Report No. 83, Fume Arrestment, Report of the Proceedings of the Autumn General Meeting of the Iron and Steel Institute, held at Church House Great Smith Street SW 1 on 26 and 27 Nov., 1963.
  • differential pressure-type scrubber applied to the process according to the present invention is well known, too, and is described for example in Krupp Technical Review, 1964, No. 3, 129-131, and in the journal Staub 21 (1961) No.9, 418-425.
  • the same shows a system in which converter gases containing carbon monoxide at the mouth of a converter 1, in which pig iron is being refined by means of blowing oxygen, are drawn out by a suction-type ventilator or exhaust blower 2 via conduit means that incorporate an open, cooled gas collector hood 3 and a waste-heat boiler 4, Le, a boiler in which the heat of waste gases is utilized.
  • the blower 2 is operated to produce a constant suction output.
  • the gas collector hood 3 which is at that end of the conduit means that is arranged above the mouth of the converter, is provided with an annular jacket 3a, or similar means.
  • the jacket 3a is in communication with a source of suction 3b and has inlet means 30 at the bottom so as to form an annular curtain of air 3' between the lower end of the collector hood 3 and the mouth of the converter 1.
  • This collector hood 3 thus enables the blower 2 to draw in as much air as is necessary for burning off the converter gases in the waste-heat boiler 4, so thet the carbon monoxide components of the converter gases can be burned off to the extent desired. If, however, the converter gases are not to be burned off, the air intake can be cut oil completely by means of the gas collector hood 3.
  • the blower 2 operates to produce a constant suction during the oxygen blowing phase, more air will be drawn in through the hood 3 at the start and at the end of the blowing phase than is needed for combusting the carbon monoxide components of the converter gases, while at the time of maximum carbon combustion, the air which flows in will not be enough for burning off the large amounts of converter gases that are produced for a short time.
  • the collector hood 3 prevents the converter gases from surging out. Both the burned off components of the waste gases as well as the non-combusted components are then cleaned in a differential pressure-type scrubber 5 which is set to operate at a constant pressure differential and which serves as a dust separator.
  • the gas mixture After leaving the scrubber 5, the gas mixture is made toflow, under the influence of the blower 2, through a clean-gas stack 6 at whose upper end there is formed a mouth 7.
  • the flame burning at the mouth 7 burns off the remaining non-combusted converter gases, and the mixture then passes into the atmosphere.
  • the distribution of the converter gas quantities throughout the blowing phase will be changed.
  • the time at which the maximum carbon combustion occurs may be advanced so as to occur at the beginning of the blowing phase.
  • the suction output of the blower 2 as Well as the differential pressure of the scrubber 5 will be changed so as to meet the requirements of the particular operating conditions, so as to enable the system to operate at constant suction and at a constant pressure differential even under the changed operating conditions. This may be done, for example, by adjusting the baffles 2a arranged ahead of the blower 2, and by the adjustment shown symbolically at 5a. (These adjustments should not be confused with the regulating means described in the introduction, which are means which change the suction and the dust separation effect during the oxygen-blowing phase.)
  • the dust separator and the gas cooling arrangement can be kept substantially smaller, and the regulating systems can be dispensed with. Consequently, the initial costs are substantially less.
  • a method of drawing ofi the converter gases which are produced during an oxygen blowing iron refining process and of separating the dust from such gases comprising the steps of (a) drawing off said converter gases, under a constant suction, during said refining process including the oxygen blowing phase thereof by means of a suction blower;
  • step (0) comprises providing an annular curtain of air that surrounds the mouth of the converter.
  • suction and the dust separating rate are adjusted to the particular type of oxygen blowing operation being carried out in the converter.

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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)
  • Incineration Of Waste (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
US47654565 1964-08-01 1965-08-02 Method for drawing off converter gases Expired - Lifetime US3352088A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB0077945 1964-08-01

Publications (1)

Publication Number Publication Date
US3352088A true US3352088A (en) 1967-11-14

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US47654565 Expired - Lifetime US3352088A (en) 1964-08-01 1965-08-02 Method for drawing off converter gases

Country Status (8)

Country Link
US (1) US3352088A (enrdf_load_stackoverflow)
AT (1) AT263831B (enrdf_load_stackoverflow)
BE (1) BE667678A (enrdf_load_stackoverflow)
DE (1) DE1433450A1 (enrdf_load_stackoverflow)
GB (1) GB1096795A (enrdf_load_stackoverflow)
LU (1) LU49217A1 (enrdf_load_stackoverflow)
NL (1) NL6509919A (enrdf_load_stackoverflow)
SE (1) SE311668B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS518086B1 (enrdf_load_stackoverflow) * 1967-12-11 1976-03-13
FR2342092A1 (fr) * 1976-02-27 1977-09-23 Mannesmann Ag Procede et appareillage pour le fonctionnement d'une installation de depoussierage
EP0225930A1 (en) * 1985-12-10 1987-06-24 Nippon Steel Corporation Exhaust-gas treatment system of sealed-type converter
EP0227858A1 (en) * 1984-07-06 1987-07-08 Nippon Steel Corporation Method of operation of exhaust-gas treatment system of sealed type converter under abnormal conditions
CN114381569A (zh) * 2022-01-18 2022-04-22 南京罕华流体技术有限公司 一种转炉系统煤气回收优化综合评价方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB891053A (en) * 1960-06-21 1962-03-07 Jean Emile Prat Separation of dust from hot gas
GB938818A (en) * 1960-05-24 1963-10-09 Steinmueller Gmbh L & C Method of and apparatus for treating the waste gases of blown steel converters
US3111400A (en) * 1960-02-25 1963-11-19 Beteiligungs & Patentverw Gmbh Method of and apparatus for removing and burning or chemical uttlization of convertergases, particularly during the fining process of crude-iron with oxygen
US3118759A (en) * 1961-05-19 1964-01-21 Yawata Iron & Steel Co Method for recovering waste gas from oxygen top blowing converter in unburned state
US3173489A (en) * 1962-10-29 1965-03-16 Yawata Iron & Steel Co Method of preventing explosions in waste gas recovery systems for oxygen top-blowing converters
US3215523A (en) * 1963-05-27 1965-11-02 Chemical Construction Corp Recovery of off-gas from a steel converter
US3218158A (en) * 1962-03-14 1965-11-16 Siderurgie Fse Inst Rech Method of controlling the exhaust of gases from a metal refining bath

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3111400A (en) * 1960-02-25 1963-11-19 Beteiligungs & Patentverw Gmbh Method of and apparatus for removing and burning or chemical uttlization of convertergases, particularly during the fining process of crude-iron with oxygen
GB938818A (en) * 1960-05-24 1963-10-09 Steinmueller Gmbh L & C Method of and apparatus for treating the waste gases of blown steel converters
GB891053A (en) * 1960-06-21 1962-03-07 Jean Emile Prat Separation of dust from hot gas
US3118759A (en) * 1961-05-19 1964-01-21 Yawata Iron & Steel Co Method for recovering waste gas from oxygen top blowing converter in unburned state
US3218158A (en) * 1962-03-14 1965-11-16 Siderurgie Fse Inst Rech Method of controlling the exhaust of gases from a metal refining bath
US3173489A (en) * 1962-10-29 1965-03-16 Yawata Iron & Steel Co Method of preventing explosions in waste gas recovery systems for oxygen top-blowing converters
US3215523A (en) * 1963-05-27 1965-11-02 Chemical Construction Corp Recovery of off-gas from a steel converter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS518086B1 (enrdf_load_stackoverflow) * 1967-12-11 1976-03-13
FR2342092A1 (fr) * 1976-02-27 1977-09-23 Mannesmann Ag Procede et appareillage pour le fonctionnement d'une installation de depoussierage
EP0227858A1 (en) * 1984-07-06 1987-07-08 Nippon Steel Corporation Method of operation of exhaust-gas treatment system of sealed type converter under abnormal conditions
EP0225930A1 (en) * 1985-12-10 1987-06-24 Nippon Steel Corporation Exhaust-gas treatment system of sealed-type converter
CN114381569A (zh) * 2022-01-18 2022-04-22 南京罕华流体技术有限公司 一种转炉系统煤气回收优化综合评价方法
CN114381569B (zh) * 2022-01-18 2023-01-17 南京罕华流体技术有限公司 一种转炉系统煤气回收优化综合评价方法

Also Published As

Publication number Publication date
GB1096795A (en) 1967-12-29
DE1433450A1 (enrdf_load_stackoverflow) 1970-11-26
AT263831B (de) 1968-08-12
BE667678A (enrdf_load_stackoverflow) 1965-11-16
NL6509919A (enrdf_load_stackoverflow) 1966-02-02
SE311668B (enrdf_load_stackoverflow) 1969-06-23
LU49217A1 (enrdf_load_stackoverflow) 1965-09-30

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