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OG System

The OG system (Oxygen Converter Gas Recovery System) is suppressed type LD gas recovery system for the converters of steel makings shops. The OG system was jointly developed and improved by both Nippon Steel Corporation (NSC/ now NSSC) and Kawasaki Heavy Industries Ltd. (KHI), in Japan. In 2004, steel plant division of KHI was transferred to JP Steel Plantech, Co (SPCO).
Therefore, SPCO and NSC have developed the technologies and own the patents of the OG system. Until now, totally 192 OG systems have been installed in all over the world, thus the name of “OG” is widely admitted not only as the safest process for recovering LD gas with high efficiency but also as a synonym of the best solution for energy saving and environmental control.

News List

16. Oct, 2023
Hot Run of OG System in Usiminas Ipatinga Plant after Revamping Work

Solutions

  • 10 % or less

    combustion rate at furnace throa

Reduction of Production Cost

The Hood pressure contol system of OG can ensure to suppress combustion rate of LD gas down to 5 -10%, by automatic control of the Ring Slit Washer (RSW) being also fucntioned as key part(s) of the Dust collecting system of OG.
This system leads to minimize LD-gas flow rate throughout converter’s operations, that surely makes it possible to get much more compact facilities compared with the system of full-combustion type. Therefore, the key components such as IDFan, pumps can also be minimized so that cost-saving can be certainly achieved more in terms not only of their initial investment but also of their electrical power consumption.

Customization

The compact facility of OG system featuring suppressed combustion type ensures you to provide more flexible design, compared with others of full-comnustion type.
The compact facility and its high-flexibility of design of OG surely can correspond to any site-condition fully well enough for your needs especially for revamping projects.

Environmental Friendliness

  • 70~100 ㎥N/t-steel
    (at 2000kcal/㎥N)

    Basic unit of recovered gas

  • 70~100 kg/t-steel

    Basic unit of recovered steam

  • 30~50 mg/㎥N
    (at flare stack outlet)

    Dust-collection performance

  1. 1The venturi scrubber-type Ring Slit Washer (RSW), being as the key part(s) of the 2nd stage dust collecting system of OG, allows superior dust collection efficiency to be maintained even when amount of LD-gas fluctuates during blowing.
  2. 2All the inside surfaces of Gas duct of OG keeps fully-wet as always so that there is no iginition source at all, that surely ensure you to keep positive safety throughout converter’s operations.
  3. 3Not only LD-gas recovery with high density of CO, steam generation by boiler system can be simultaneously achieved by OG. Also our unique technologies of installing convection heat transfer part(s) additionally can give you more amount of steam.

References

since 1962 192 sets

Supplied To Country Quantity Start Up
  • Asia・Oceania
  • Formosa Ha Tinh Steel Vietnam 3 sets Under construction
  • Hyundai Steel South Korea 2 sets 2013
  • Maanshan Iron & Steel China 1 set 2012
  • Nippon Steel & Sumitomo Metal / Ogura Works Japan 1 sets 2010
  • Nippon Steel & Sumitomo Metal / Wakayama Works Japan 7 sets 2010, 1999, 1987, 1965, 1963
  • Hyundai Steel South Korea 3 sets 2010
  • Maanshan Iron & Steel China 2 sets 2007
  • Nippon Steel & Sumitomo Metal Japan 35 sets 2007-1962
  • Shanghai No.1 Iron & Steel (Baosteel Gr) China 2 sets 2004
  • Maanshan Iron & Steel China 3 sets 2004, 2001
  • Steel Authority of India India 2 sets 1997
  • China Steel (CSC) Taiwan 1 set 1996
  • JFE Steel / East Japan Wokrs (Chiba Area) Japan 6 sets 1994, 1977, 1970
  • POSCO South Korea 1 set 1992
  • Nisshin Steel Japan 6 sets 1991, 1980, 1966, 1965
  • POSCO South Korea 2 sets 1990
  • China Steel (CSC) Taiwan 2 sets 1987
  • Baoshan Iron & Steel China 3 sets 1985
  • New Zealand Steel New Zealand 1 set 1985
  • Kobe Steel / Kobe Works Japan 2 sets 1983-1982
  • JFE Steel / West Japan Wokrs (Fukuyama Area) Japan 5 sets 1983, 1982, 1973
  • Australian Iron & Steel Australia 1 set 1983
  • Tata Steel India 2 sets 1983
  • JFE Steel / Mizushima Works Japan 6 sets 1982-1981
  • China Steel (CSC) Taiwan 1 set 1981
  • POSCO South Korea 3 sets 1981, 1978
  • China Steel (CSC) Taiwan 2 sets 1977
  • JFE Steel / East Japan Works (Ohgishima) Japan 3 sets 1979, 1976
  • Nippon Steel & Sumitomo Metal / Kokura Works Japan 3 sets 1976, 1974, 1970
  • POSCO South Korea 1 set 1976
  • Nakayama Steel / Funamachi Plant Japan 2 sets 1975
  • Nippon Steel & Sumitomo Metal / Kashima Works Japan 5 sets 1974, 1973, 1971
  • Kobe Steel / Kakogawa Works Japan 3 sets 1973-1970
  • POSCO South Korea 2 sets 1973
  • Australian Iron & Steel Australia 2 sets 1972
  • Godo Steel / Torishima Works Japan 2 sets 1964
  • North America
  • Steel Company of Canada Canada 2 sets 1980
  • Fundidora Monterrey S.A. Mexico 2 sets 1977
  • Altos Hornos de Mexico Mexico 1 set 1976
  • Inland Steel USA 2 sets 1974
  • U.S.Steel USA 2 sets 1970
  • Armco Steel USA 2 sets 1969
  • Bethlehem Steel USA 2 sets
  • South America
  • Companhia Siderurgica de Tubaro Brazil 1 set 2007
  • Companhia Siderurgica de Tubaro Brazil 2 sets 2003
  • COSIPA Brazil 2 sets 1986
  • Companhia Siderurgica Nacional Brazil 1 set 1982
  • USIMINAS Brazil 3 sets 1981
  • Companhia Siderurgica Nacional Brazil 2 sets 1977
  • USIMINAS Brazil 2 sets 1975
  • Sociedad Mixta Siderurgia Argentina Argentina 2 sets 1973
  • Europe・Middle East
  • KN.Hoogovens The Netherlands 2 sets 1991
  • ENSIDESA Spain 2 sets 1987
  • Italsider S.P.A. Italy 3 sets 1985
  • N.V.Sidemar Belgium 2 sets 1983
  • British Steel U.K. 2 sets 1978
  • British Steel U.K. 1 set 1977
  • KN.Hoogovens The Netherlands 1 set 1976
  • Surahammars Bruks AB Sweden 1 set 1974
  • Italsider S.P.A. Italy 1 set 1974
  • Italsider S.P.A. Italy 2 sets 1973
  • British Steel U.K. 3 sets 1973
  • British Steel U.K. 2 sets 1969
  • Siderurgia Nacional.E.P. Portugal 2 sets
  • Africa
  • Societe Nationale de Siderurgie Algeria 3 sets 1981
  • Societe Nationale de Siderurgie Algeria 3 sets 1979
  • South African Iron & Steel South Africa 2 sets 1975
  • South African Iron & Steel South Africa 4 sets 1974

Technical Information

Functions of the OG System

The exhaust gas discharged from the converter furnace is the gas of high temperature (1,450°C) containing high concentration of CO (95%).
The OG unit is an oxygen converter gas treatment system which is designed for the purpose of cooling this exhaust gas by burning it as little as possible, removing the dust contained in the exhaust gas at high concentration and recovering the gas as CO gas which can be used as fuel.

  1. 1P0 Control
  2. 2Hood Dolly
  3. 3Dust collector
  4. 43-way valve & Water sealed check valve
  5. 5Clean gas emission form flare stack
  • The combustion of the CO gas generated by the converter furnace is lowered to 10% or less by the hood pressure control system.
  • The high temperature (1,450°C) CO gas is cooled down to approximately 600°C to 1,000°C by the cooling system.
  • If the cooling system is changed to the boiler type, the sensible heat of the high temperature gas can be recovered as steam..
  • The steam recovery amount can be further increased by introducing the convection heat transfer area to boiler.
  • The gas cooled by the cooling system is further cooled to approximately 70°C by the wet dust collector and 99.9% of the high concentration dust in the gas is removed.
  • The high concentration (70 to 80%) CO gas which was cooled and treated for the dust removal is stored in the gas holder and used as fuel, etc. The gas recovery rate is 70% to 90%.

OG Boiler System

P0 Control

Hood trolley

Dust collector

3-way valve & Water sealed check valve

Clean gas emission form flare stack