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Blast Furnace Gas Cleaning System
(RSW – Ring Slit Washer)

The Ring Slit Washer (RSW) wet gas scrubber is used widely with various dust collection devices, including its use for cleaning the gas emitted by blast and converter furnaces.

Solutions

Production Cost Reduction

In addition to a dust collection function, RSW (Ring Slit Washer) has a function to control the top pressure of a blast furnace with a built-in RSE (Ring Slit Element). Therefore, this system does not require septum valves, and can realize facility cost reduction.
Furthermore, combined with a TRT(top pressure recovery turbine ), this system can generate high efficiency power by blast furnace top gas pressure.

Customization

The RSE is raised by a hydraulic cylinder, and a hydraulic oil room is installed near the RSW. 
If a customer requires only the dust collection function, hydraulic oil room becomes unnecessary by adopting an electro-hydraulic hybrid system, and it can be reduced a construction cost. 
The electro-hydraulic hybrid system is a system where a hydraulic cylinder is directly operated by adjusting the forward and reverse flow of an inverter motor type hydraulic pump, and whole hydraulic power unit is stored in the lower part of a RSW main unit.

References

Supplied To Country Applicable equipment Start Up
  • Asia・Oceania
  • Mizushima Ferroalloy Japan Ferroalloy furnace 2012
  • JFE Steel / West Japan Wokrs (Fukuyama Area) Japan 3 blast furnaces 2011
  • JFE Steel / West Japan Wokrs (Kurashiki Area) Japan 3 blast furnaces 2010
  • Kobe Steel / Kakogawa Works Japan 2 blast furnaces 2007
  • JFE Steel / West Japan Wokrs (Fukuyama Area) Japan 4 blast furnaces 2006
  • Nippon Steel & Sumitomo Metal / Kashima Works Japan 1 blast furnace 2004
  • JFE Steel / West Japan Wokrs (Kurashiki Area) Japan 2 blast furnaces 2003
  • Nisshin Steel / Kure Works Japan 1 blast furnace 2001
  • Nippon Steel & Sumitomo Metal / Kashima Works Japan 3 blast furnaces 1990
  • China Steel (CSC) Taiwan 3 blast furnaces 1987
  • Nippon Steel & Sumitomo Metal / Kashima Works Japan 2 blast furnaces 1984
  • Kobe Steel / Kobe Works Japan 3 blast furnaces 1983
  • Kobe Steel / Kakogawa Works Japan 1 blast furnace 1983
  • JFE Steel / East Japan Wokrs (Chiba Area) Japan 5 blast furnace 1980
  • Nippon Steel & Sumitomo Metal / Kokura Works Japan 1 blast furnace 1979
  • JFE Steel / East Japan Wokrs (Chiba Area) Japan 6 blast furnace 1977
  • Nisshin Steel / Kure Works Japan 1 blast furnace 1975
  • Nippon Steel & Sumitomo Metal / Kokura Works Japan 2 blast furnace 1974
  • Nisshin Steel / Kure Works Japan 2 blast furnace 1973
  • South America
  • COSIPA Brazil 1 blast furnace 1987

Technical Information

The features of RSW

The RSW jointly contains an auxiliary spray tower-type scrubber in its upper part and a variable throat-type venturi scrubber called RSE in its lower part. An axis flow mist separator is installed in the downstream to separate air and liquid.
In this way, this system realizes the dust content at the outlet of the system of 5 mg/Nm3 or lower.

(Features)
  1. Compact, space-saving system.
  2. Achieved excellent dust collection performance with its low load differential pressure and liquid-gas ratio.
  3. The load differential pressure is 30 kPa, and the dust content at the outlet of the RSW is 5 mg/Nm3 or lower.
  4. Realized excellent blast furnace top pressure control performance.
  5. Adopted Steel Plantech’s unique large diameter hollow cone spray nozzle.