Coking with 7m coke ovens using blended coal
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Compared to 6m coke ovens, what are the operational issues with 7m coke ovens? Is it necessary to adjust the coal blending ratio? I would appreciate some guidance from experts
Yes, the most obvious issue to address is uniform heating in the vertical direction, which requires changes to the flame channel. The flame needs to be made longer. There are many more as well
It depends on the width of the carbonization chamber in your 7M coke oven. For coke ovens with a wide carbonization chamber – greater than 500 mm – in order to produce high-quality metallurgical coke, it is necessary to ensure that the proportion of strongly cohesive coals (coking coal and fat coal) in the coal blend is over 70%, with the volatile matter content of the coal blend controlled between 22% and 25%.
Now, 7-meter coke ovens are also designed with segmented heating, which is really great.
I heard that 7m coke ovens tend to form graphite; is this a common occurrence?
It definitely needs to be changed; I think it’s the length of the flame. It’s necessary to control both the temperature and the time
The length has been increased from 6 meters to 7 meters; not only has the height of the carbonization chamber increased, but its width has also increased. As a result, the packing density of the coal loaded will increase to some extent. The quality of the coke should improve under the same composition. Therefore, from the perspective of coal blending, there won’t be any major changes – only minor adjustments will be necessary. At the time of commissioning, to ensure the quality of the coke, I believe it would be appropriate to increase the proportion of strongly cohesive coal, thereby preventing the coke pieces from becoming smaller due to an extended coking time. I look forward to expert advice
The bulk density of the coal charge will increase to some extent, but the quality of the coke may not necessarily improve under the same composition. Coke ovens with wide carbonization chambers have a slower coking rate, and they require very high standards regarding coal quality; therefore, in the preparation of coal for coking, more than 50% should be main coking coal, while the proportion of strongly sticky coal should reach 70%