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1st International Meeting on Ironmaking — vol. 1, num.1 (2001)
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Measures to prolong battery life include ensuring adequate coque cake contraction to avoid hard pushes and "stickers". Pushing forces and coque contraction in the oven have been investigated by a number of workers using different techniques. In this work, charges in a 300 kg capacity Carbolite pilot-scale oven were cooled in situ, and filler gauges were used to measure the minimum space between the convex coque lumps and the oven wall. An average of about one hundred such measurements is obtained for each charge and are as low as 2 mm for low-volatile coals or blends and as high as 18 mm for high-volatile coals. For a typical Canadian steelmaker's blend, increasing coal bulk density from 750 to 940 kg/m³ decreased contraction from 14 to 4 mm, while changing the coking rate from 22 to 13 hours produced a decrease from 12 to 7 mm. Wall clearance during coking has been examined and is improved by 40% through a three-hour soak. Contraction was unchanged for this strongly coking blend after two years of storage, and presently a weaker blend is being tested. Measurements show that contraction is not uniform, so even a high contracting charge has some coque lumps left close to the wall. Results are examined in light of other coking parameters and industrial pushing forces obtained in a Canadian steel plant.
Measures to prolong battery life include ensuring adequate coque cake contraction to avoid hard pushes and "stickers". Pushing forces and coque contraction in the oven have been investigated by a number of workers using different techniques. In this work, charges in a 300 kg capacity Carbolite pilot-scale oven were cooled in situ, and filler gauges were used to measure the minimum space between the convex coque lumps and the oven wall. An average of about one hundred such measurements is obtained for each charge and are as low as 2 mm for low-volatile coals or blends and as high as 18 mm for high-volatile coals. For a typical Canadian steelmaker's blend, increasing coal bulk density from 750 to 940 kg/m³ decreased contraction from 14 to 4 mm, while changing the coking rate from 22 to 13 hours produced a decrease from 12 to 7 mm. Wall clearance during coking has been examined and is improved by 40% through a three-hour soak. Contraction was unchanged for this strongly coking blend after two years of storage, and presently a weaker blend is being tested. Measurements show that contraction is not uniform, so even a high contracting charge has some coque lumps left close to the wall. Results are examined in light of other coking parameters and industrial pushing forces obtained in a Canadian steel plant.
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Khan, Mohammed A.;
Gransden, John F.;
Price, John T..
Extending battery life by improving coke contraction
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p. 141-162.
In: 1st International Meeting on Ironmaking,
Belo Horizonte - MG, Brasil,
2001.
ISSN: -
, DOI 10.5151/ABM-IRONMAKING-2001-2001205
