WO2002075003A2 - Procede et systeme de regulation d'un convertisseur aod - Google Patents

Procede et systeme de regulation d'un convertisseur aod Download PDF

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Publication number
WO2002075003A2
WO2002075003A2 PCT/IT2002/000180 IT0200180W WO02075003A2 WO 2002075003 A2 WO2002075003 A2 WO 2002075003A2 IT 0200180 W IT0200180 W IT 0200180W WO 02075003 A2 WO02075003 A2 WO 02075003A2
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WO
WIPO (PCT)
Prior art keywords
model
oxygen
converter
gases
flow rate
Prior art date
Application number
PCT/IT2002/000180
Other languages
English (en)
Other versions
WO2002075003A3 (fr
Inventor
Marco Rinaldi
Marco Mignanti
Vinicio De Angelis
Original Assignee
Thyssenkrupp Acciai Speciali Terni S.P.A.
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 Thyssenkrupp Acciai Speciali Terni S.P.A. filed Critical Thyssenkrupp Acciai Speciali Terni S.P.A.
Priority to AU2002253520A priority Critical patent/AU2002253520A1/en
Publication of WO2002075003A2 publication Critical patent/WO2002075003A2/fr
Publication of WO2002075003A3 publication Critical patent/WO2002075003A3/fr

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Classifications

    • 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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4673—Measuring and sampling devices

Definitions

  • the present invention refers to a control method and to a related system for converters employed in stainless steelmaking, converters called AOD from Argon Oxygen
  • the main goal in the AOD-type processes is to reach the end-point desirable in terms of Carbon as quickly as possible, fostering the oxidation of the Carbon in lieu of that of the Chromium without lowering the bath temperature below the optimum thermal level.
  • the process times and the heat losses are decreased, but there is an increase in costs because of the need to add a reducing element (Silicon, Aluminium) in order to recover the Chromium oxide.
  • the oxides resulting from the reduction of the Chromium oxide via the addition of said reducing agents increase the aggressiveness of the slag in relation to the refractory. In order to neutralise this effect, in a traditional process great quantities of lime are additioned, thereby increasing the thermal losses and the production costs.
  • the best way to attain this aim is known to be an adequate lowering of the partial pressure of the Carbon monoxide (CO) in the liquid bath, lowering carried out by a controlled decrease of the Oxygen/inert gases ratio. In fact, this lowering fosters the oxidation of the Carbon, preventing an excessive oxidation of the Chromium.
  • This lowering is usually carried out statically, i.e. the ratio is varied, at predetermined time intervals, of a discrete quantity.
  • This system proved partly unsatisfactory since, though optimizing the process on the average, it fails to optimize the single casting.
  • the technical problem underlying the present invention is to provide an AOD converter control method and system allowing to overcome the drawback mentioned with reference to the known art . This problem is solved by a method as abovespecified, comprising the following steps:
  • a system as abovespecified comprises:
  • a static control providing: the composition of the inletted ferrous metal; the desired steel type; the quantities of the additives to be additioned to the bath, and the initial values of the injected Oxygen and Nitrogen flow rates.
  • the main advantage of the abovedefined method and system lies in ensuring the utmost effectiveness of the Oxygen blown into the converter and in letting the stainless steel refining process proceed at top speed.
  • the present invention will hereinafter be described according to a preferred embodiment thereof, given by way of a non-limiting example with reference to the attached drawing, in which the sole figure schematically depicts an AOD converter.
  • a base element of the system is an analyzer of the gases outletted from the converter 1, schematically indicated with 2 and located in the outlet duct 3 of the mouth 4 of the vessel 5.
  • the probe of the waste gas analyzer (not shown) is positioned in the descending section of the outlet duct, upstream of the scrubber, in order to minimize the lag between the measuring of the gas composition and the actual gas composition at the outlet of the converter 1. Although thereat, the outletted gas has already mixed with the air inletted at the mouth 4, the measuring is sufficiently accurate.
  • the model and the analyzer 2 interact therebetween by virtue of a control system implemented in a computer 6.
  • the analyzer 2 is coupled to a flow rate meter, schematically indicated with 7 and it is positioned at a spot (not shown) downstream of the scrubber and upstream of the fans. This position prevents the probe 7 from being impinged onto by high-temperature and powder-rich gases .
  • An adequate type of measuring system is an ultrasonic system consisting of a whirler (e.g. of the Vortex ® type) and a transducer. The temperature is measured in this same spot .
  • the control system according to the present embodiment relies on the use of a mathematical model which simulates the performance of an AOD converter 1 (see figure) , thereby enabling the control system to select the optimum strategy .
  • the model is designed to simulate: i) the converter startup; ii) the mass balance, to compute the bath composition due to the chemical reactions under way; iii) the energy balance, to compute the bath temperature due to the energy interactions; and iv) the variation of the operative conditions .
  • hypotheses underlying the model can be summarized as follows : (a) the state variables of the converter assume the same value anywhere inside the vessel (perfect mixing hypothesis) ;
  • the heat balance is performed by taking account of any loss (radiant energy, endothermal reduction reactions; blowing in of cold gases; addition of cold materials) .
  • the chemical species reacting in the molten bath are: Iron (Fe) , Carbon (C) , Chromium (Cr) , Silicon (Si) , Nickel (Ni) and
  • Manganese (Mn) Manganese
  • composition of the gas blown in for the decarburization comprises Oxygen (0 2 ) , Argon (Ar) and
  • Nitrogen (N 2 ) whereas the composition of the outletted gas additionally comprises Carbon monoxide (CO) .
  • This model is employed to simulate the evolution of the decarburization process according to the base parameters (bath temperature, chemical composition) which vary according to the regulation variables (blowing parameters, additives) as well as to analyze the potential process evolution deriving from the different running strategies .
  • the model is fed with other static data, like: the composition of the inletted ferrous metal, the temperature of the inletted material, the other features of the charged ferrous metal, the desired steel type.
  • a static-type model provides several initial parameters: the quantities of the additives to be additioned to the bath and the initial values of the flow rates of Oxygen and Nitrogen injected via the nozzle 10 and the lance 11.
  • the control system uses a proportional -type operation logic, simpler and more reliable than the systems which rely on a fuzzy control .
  • the control method of the AOD converter 1 comprises a step of measuring the flow rate, the temperature and the composition of the gases outletted from the mouth 4 of the converter 1.
  • the Oxygen/Inert gas ratio is varied (increased or decreased) , thereby keeping at all times the CRE (Carbon Removal Efficiency) above a critical threshold value depending on the steel type.
  • the value of the critical CRE is computed in the light of the off-line simulations carried out with the mathematic model, whereas the CRE is computed with the measurings inputted by the field instruments: the %CO in the gases is multiplied by the flow rate of the waste gases (expressed in Nm 3 /min) and divided by the Oxygen flow rate .
  • This system is calibrated so as to avoid eventual instabilities due to the lag between the instrument response and the adjusting actions.
  • the application of the abovedescribed method and system yields a reduction in the consumption of Silicon in the order of 10%, with peaks of up to the 25%, and a reduction of the process times in the order of the 4%, with peaks of up to 16%.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Control Of Non-Electrical Variables (AREA)

Abstract

L'invention concerne un système de régulation d'un convertisseur AOD fondé sur l'analyse des gaz de combustion et sur le traitement desdits gaz par le biais d'un modèle mathématique qui agit sur les débits des gaz de combustion de façon à optimiser le taux de décarburation. Le système comprend un analyseur des gaz de combustion (1), un débitmètre (2), un système de régulation fondé sur un modèle mathématique qui s'exécute dans un ordinateur (3) et traite en ligne les informations produites par ces capteurs; et un système pour actionner les soupapes de gaz utilisé (4).
PCT/IT2002/000180 2001-03-21 2002-03-21 Procede et systeme de regulation d'un convertisseur aod WO2002075003A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002253520A AU2002253520A1 (en) 2001-03-21 2002-03-21 Argon oxygen decarburisation converter control method and system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM2001A000146 2001-03-21
IT2001RM000146A ITRM20010146A1 (it) 2001-03-21 2001-03-21 Metodo e sistema di controllo per convertitori aod.

Publications (2)

Publication Number Publication Date
WO2002075003A2 true WO2002075003A2 (fr) 2002-09-26
WO2002075003A3 WO2002075003A3 (fr) 2003-02-13

Family

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Family Applications (1)

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PCT/IT2002/000180 WO2002075003A2 (fr) 2001-03-21 2002-03-21 Procede et systeme de regulation d'un convertisseur aod

Country Status (3)

Country Link
AU (1) AU2002253520A1 (fr)
IT (1) ITRM20010146A1 (fr)
WO (1) WO2002075003A2 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008049673A1 (fr) * 2006-10-27 2008-05-02 Siemens Aktiengesellschaft Procédé de régulation de l'émission de monoxyde de carbone dans un procédé de fusion métallurgique
US8048196B2 (en) 2006-11-30 2011-11-01 Sms Siemag Aktiengesellschaft Method and device for producing stainless steel without using a supply of electrical energy, based on pig-iron that has been pre-treated in a DDD installation
US8430945B2 (en) 2006-11-30 2013-04-30 Sms Siemag Aktiengesellschaft Method and device for producing pig-iron based stainless steel without using a supply of electrical energy
JP2013181194A (ja) * 2012-03-01 2013-09-12 Jfe Steel Corp 吹錬プロセス操業支援方法及び吹錬プロセス操業支援装置
CN103805733A (zh) * 2002-11-16 2014-05-21 Sms西马格股份公司 用于一个金属冶炼炉的气体输入管道系统以及对此的工作方法
CN105750292A (zh) * 2016-04-28 2016-07-13 无锡三达环保科技有限公司 Aod炉拆包捕集罩
CN109811136A (zh) * 2019-01-11 2019-05-28 东北大学 一种渣浴碳热还原渣池热补偿方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3594155A (en) * 1968-10-30 1971-07-20 Allegheny Ludlum Steel Method for dynamically controlling decarburization of steel
US3816720A (en) * 1971-11-01 1974-06-11 Union Carbide Corp Process for the decarburization of molten metal
US3920447A (en) * 1972-02-28 1975-11-18 Pennsylvania Engineering Corp Steel production method
US4512802A (en) * 1983-03-21 1985-04-23 Nippon Yakin Kogyo Kabushiki Kaisha Process for the decarburization of molten metal

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
JPS5131001B2 (fr) * 1972-09-07 1976-09-04
JPS5938316A (ja) * 1982-08-25 1984-03-02 Kawasaki Steel Corp 高クロム鋼の溶製方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3594155A (en) * 1968-10-30 1971-07-20 Allegheny Ludlum Steel Method for dynamically controlling decarburization of steel
US3816720A (en) * 1971-11-01 1974-06-11 Union Carbide Corp Process for the decarburization of molten metal
US3920447A (en) * 1972-02-28 1975-11-18 Pennsylvania Engineering Corp Steel production method
US4512802A (en) * 1983-03-21 1985-04-23 Nippon Yakin Kogyo Kabushiki Kaisha Process for the decarburization of molten metal

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
KOEHLE S ET AL: "BEOBACHTUNG DES ENTKOHLUNGSPROZESSES ANHAND VON ABGASMESSUNGEN" STAHL UND EISEN, VERLAG STAHLEISEN GMBH. DUSSELDORF, DE, vol. 113, no. 6, 14 June 1993 (1993-06-14), pages 55-60, XP000369701 ISSN: 0340-4803 cited in the application *
PATENT ABSTRACTS OF JAPAN vol. 008, no. 126 (C-228), 13 June 1984 (1984-06-13) -& JP 59 038316 A (KAWASAKI SEITETSU KK), 2 March 1984 (1984-03-02) -& DATABASE WPI Week 198424 Derwent Publications Ltd., London, GB; AN 1984-148573 XP002220175 "Decarburisation smelting high chromium content steel" & JP 59 038316 A (KAWASAKI STEEL CORP) *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103805733A (zh) * 2002-11-16 2014-05-21 Sms西马格股份公司 用于一个金属冶炼炉的气体输入管道系统以及对此的工作方法
WO2008049673A1 (fr) * 2006-10-27 2008-05-02 Siemens Aktiengesellschaft Procédé de régulation de l'émission de monoxyde de carbone dans un procédé de fusion métallurgique
US8092572B2 (en) 2006-10-27 2012-01-10 Siemens Aktiengesellschaft Method of regulating the output of carbon monoxide in a metallurgical melting process
RU2454465C2 (ru) * 2006-10-27 2012-06-27 Сименс Акциенгезелльшафт Способ регулирования выпуска окиси углерода в металлургическом процессе плавления
US8048196B2 (en) 2006-11-30 2011-11-01 Sms Siemag Aktiengesellschaft Method and device for producing stainless steel without using a supply of electrical energy, based on pig-iron that has been pre-treated in a DDD installation
US8425831B2 (en) 2006-11-30 2013-04-23 Sms Siemag Aktiengesellschaft Method and device for producing stainless steel without using a supply of electrical energy, based on pig-iron that has been pre-treated in a DDD installation
US8430945B2 (en) 2006-11-30 2013-04-30 Sms Siemag Aktiengesellschaft Method and device for producing pig-iron based stainless steel without using a supply of electrical energy
US8765051B2 (en) 2006-11-30 2014-07-01 Sms Siemag Aktiengesellschaft Method and device for producing pig-iron based stainless steel without using a supply of electrical energy
JP2013181194A (ja) * 2012-03-01 2013-09-12 Jfe Steel Corp 吹錬プロセス操業支援方法及び吹錬プロセス操業支援装置
CN105750292A (zh) * 2016-04-28 2016-07-13 无锡三达环保科技有限公司 Aod炉拆包捕集罩
CN109811136A (zh) * 2019-01-11 2019-05-28 东北大学 一种渣浴碳热还原渣池热补偿方法
CN109811136B (zh) * 2019-01-11 2020-06-02 东北大学 一种渣浴碳热还原渣池热补偿方法

Also Published As

Publication number Publication date
ITRM20010146A0 (it) 2001-03-21
ITRM20010146A1 (it) 2002-09-21
WO2002075003A3 (fr) 2003-02-13
AU2002253520A1 (en) 2002-10-03

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