Effect of Indian Medium Coking Coal on Coke Quality in Non-recovery Stamp Charged Coke Oven |
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Authors: | H P Tiwari P K Banerjee V K Saxena S K Haldar |
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Affiliation: | 1. Raw Material and Coke Making Research Group, Research and Development Division, Tata Steel Ltd.,Jamshedpur 831001, Jharkhand, India 2. Department of Chemical Engineering, Indian School of Mines,Dhanbad 826004, Jharkhand, India 3. Coke Plants, Tata Steel Ltd., Jamshedpur 831001, Jharkhand, India |
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Abstract: | The maximum possibility of utilizing the Indian coking coals and inferior grade coking coal for producing metallurgical coke through non-recovery stamp charging technology was investigated. Indian indigenous coals contained low percent of vitrinite (<50%) and higher content of ash (>15%) compared to imported coking coal. Therefore, the selection of appropriate proportion of different types of coals was a major challenge for coke makers. Coal blend selection criterion based on a single coefficient, named as composite coking potential (CCP), was developed. The use of increased proportion of semi-soft coal (crucible swelling number of 2.5) and high ash (≥15%) indigenous coal in the range of 20%-35% and 20%-65% respectively in the blends resulted in good quality of coke. Plant data of a non-recovery coke oven were used for developing and validating the model. The results showed that the coke strength after reaction (CSR) varied in the range of 63.7%-67.7% and the M40 value was between 81.8 and 89.3 in both the cases. |
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Keywords: | Indian coking coal imported coking coal CCP CSR M40 non-recovery stamp charged coke making    |
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