PCI空クリア_切抜

Pulverized Coal Injection (PCI) System for Blast Furnaces

In the past, reactions within the blast furnace were stimulated by injecting heavy oil, as auxiliary fuel, along with the blasts and oxygen. The heavy oil was replaced by pulverized coal after the oil crisis. This made it possible to use cheap coal, such as non-coking coal. Furthermore, the amount of coke used can be reduced if huge amounts of pulverized coal are injected. Therefore, in recent years, Pulverized Coal Injection (PCI) systems are used in order to lower production costs as well as extend the life cycle of coke ovens.

Solutions

  • 200以上 kg/pigiron-t

    PCI Ratio

Production Cost Reduction

This is a facility aiming at the life-prolonging measure against production cost reduction and a coke oven by direct injection of cheap coal into a blast furnace instead of expensive coke, and abundant injection of high PCI operation (200 kg/pigiron-t more) is available. 

Customization

Steel Plantech’s intermediate transfer station can handle long-distances of up to 1.5km between pulverization and drying facilities to injection facility. This allows the pulverization and drying facilities to be set up at a distance from the blast furnace, so this Pulverized Coal Injection (PCI) system can be installed even if there is only limited space around the blast furnace. 

References

Supplied To Country Applicable equipment Start Up
  • Asia・Oceania
  • JFE Steel / East Japan Wokrs (Keihin Area) Japan 2 blast furnaces 2004
  • JFE Steel / West Japan Wokrs (Fukuyama Area) (augmentative construction ) Japan 5 blast furnaces 2000
  • JFE Steel / West Japan Wokrs (Fukuyama Area) Japan 2 blast furnaces 1998
  • JFE Steel / West Japan Wokrs (Fukuyama Area) Japan 3 blast furnaces 1998

Technical Information

The features of facility

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The features of the Pulverized Coal Injection (PCI) System are as follows: 

  1. A Simple system conveying pulverized coal from injection vessels to the distributor through a single pipe and distributing it to the tuyeres at the distributer;
  2. Dense phase conveying  system (Solid-gas ratio 30 kg/kg or more) which reduces conveying gas consumption by 50% compared with a dilute phase conveying system;
  3. Conveying at low gas velocities (5 m/s or lower) which requires no measures to be taken against the  wear of expensive pipes;
  4. Adopted an automatic purging system which provides for the immediate detection of clogging in injection pipes; and
  5. Switching type injection vessels (side-by-side-vessel design) which realize low structure and facility cost reduction.

Waste Plastic Injection System(WPIS)

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As a related technology, Steel Plantech delivered the systems to inject waste plastic, as a reduction agent for blast furnaces, from tuyeres. The features of the facility are as follows:

  1. Capacity 30,000 t/year;
  2. Stable and constant mechanical feeder (table feeder), which enables:
    - An easy adjustment of  the injection amount and
    - High accuracy of the  injection amount;
  3. Adopted a branched system where a single injection pipe can be divided to distribute to two tuyeres, improving the heat balance of a furnace;
  4. Adopted an automatic purging system which immediately detects clogging in injection pipes;
  5. Adopted a large-capacity storage hopper (300 m3) and mechanical discharge system which enables constant discharge; and
  6. Switching type injection vessels (side-by-side-vessel design) which realize low structure and facility cost reduction.