Development of pulverized coal burner with intense turbulent mixing induced by the hot blast in the blast furnace tuyere
Improvement in the combustion efficiency of pulverized coal (PC) is required to secure good permeability and stable operation in blast furnaces at high PC injection rates. Model simulations and combustion tests in a packed bed were carried out to develop a high-turbulence burner with intense mixing of the pulverized coal flow and hot blast. Simulations of the PC flow in the tuyere indicated that enlargement of the outer diameter would enhance the dispersion and heating of the pulverized coal downstream of the burner. Combustion tests in a furnace with a coke bed then showed that combustion efficiency improved by approximately 10% with the high-turbulence burner. Temperature measurements and gas sampling were carried out at a tuyere of a blast furnace to examine the effect of the high-turbulence burner under practical conditions. The temperature drop in the main coal stream decreased to 100 K with the high-turbulence burner due to more effective mixing of the coal and hot blast. A carbon dioxide concentration of 0.06% was also detected as a sign of fast ignition. Measurements confirmed that better dispersion and faster ignition were obtained with the high-turbulence burner. The newly developed burner was installed at all tuyeres of No. 5 and No. 6 blast furnaces at Chiba Works to enable increased PC injection rates.
- OSTI ID:
- 460610
- Report Number(s):
- CONF-960317-; ISBN 1-886362-12-2; TRN: IM9718%%192
- Resource Relation:
- Conference: 79. steelmaking and 55th ironmaking conference, Pittsburgh, PA (United States), 24-27 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of Ironmaking conference proceedings: Volume 55; PB: 807 p.
- Country of Publication:
- United States
- Language:
- English
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