Coke Oven Productivity Improvements Oiling Evaluation · packing densities on charging to the coke...

Also, the positive effects of oiling on coal handleabilityand bulk density control of a coal blend have beendemonstrated. It was shown that bulk flow of a coalblend, as determined by the Handleability Monitor,improved on adding oil at just 0.1% by weight to theblend. This gave a simultaneous increase in bulk andpacking densities on charging to the coke oven,leading to improved coke yield. Two different oilsources were identified as giving beneficialimprovements of around 2% in coke yield over the un-oiled blend. This work led to the adoption of oiling ofthe blend at the coke plant, where improvements incoal flow gave better filling of the ovens with higherbulk density. The overall result was a 500-tonneimprovement in weekly coke yield.

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As part of a European Research Fund for Coal and Steelproject, a series of evaluations of coal blend crushing levelsachieved on coke plants in the UK and the Netherlands werecarried out in comparison to blend crushes prepared on pilotplant at the Materials Processing Institute. The aim was todetermine the effect that the level of crush has on cokequality for particular blends and to see if there was room forimprovement by better control of crushing. It wasdemonstrated that the level of crush at one UK plant was lessthan that achieved at two other UK plants in the study andthat the excessive level of larger size fractions adverselyaffected the packing density of coal in the ovens, leading tolower coke quality. Measures were put in place to improvecontrol and consistency and increase the level of crush toreduce the quantity of larger size fractions, but maintain theoptimum range for a Normal size distribution. The result wasa sustained improvement in coke quality, which with othermeasures allowed a £12 per tonne reduction in blend costs.

Crushing optimisation & yieldimprovement by blend oiling

Coke OvenProductivityImprovements

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Coal HandleabilityMonitor for BlendOiling Evaluation

CASE STUDY