THE YEAR-BOOK OF THE COKE OVEN - Coke Oven Managers ...

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Fig. 8: Percentage of Moisture of Beehive <strong>Coke</strong> received before and after implementation of Improvement Initiatives. Fig. 9: Percentage of undersize in Beehive <strong>Coke</strong> received before and after implementation of Improvement Initiatives. 16
It can be seen from figures 8 & 9 that moisture and fines levels in beehive coke received at Jamshedpur works were in the range of 14-16% and 3-4% respectively before the implementation of improvement initiatives till August 2008. After implementation of various recommendations moisture and fines levels had reduced to below 10% and 1.5% respectively. Time duration in coke pushing to next coal charging had come down from over 150 minutes to 30-40 minutes due to readiness of coal charging arrangement. Quenching time was reduced from over 40-50 to 6 minutes. This was primarily due to implementation of two stage quenching technique and use of two hosepipes simultaneously. This initiative had minimized burning of hot coke, hence, the reduction in ash content and improvement in coke strength. Reduction in overall cycle time had contributed significantly in maintaining a higher empty oven temperature (gone up from 650-950 to 930-1050 o C or even more) prior to charging. All these have contributed towards increasing the coke quality, productivity and consistency. 7. Conclusion Beehive coke oven management system was developed and implemented at various beehive coke ovens batteries at Dhanbad and Ramgarh district of Jharkhand, India which were contracted for coal to coke conversion for Tata Steel. Significant improvements in coke quality in terms of coke CSR, moisture and undersize have been achieved from beehive coke ovens by means of various improvement initiatives discussed in the present paper. The above work helped in fulfilling the blast furnace requirement from beehive coke in terms of quality by giving more focus on process improvement, people development and without any major investment. This has ensured the procurement of good quality of coke through beehive coke conversion route which is also the cheapest source available as compared to other sources like import. 17
Page 1 and 2: Journey of Improvements in Beehive
Page 3 and 4: from top of the charge to two flues
Page 5 and 6: 5% and fines (undersize) by 2% by i
Page 7 and 8: like improper cleaning of platform
Page 9 and 10: charging. Crushing fineness of coal
Page 11 and 12: Coal receipts at beehive ovens (Dha
Page 13 and 14: Quenching system was made ready bef
Page 15: Fig. 7: CSR values (yearly average)

THE YEAR-BOOK OF THE COKE OVEN - Coke Oven Managers ...

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