Optimal thermal conditions for the production of coke of a specific quality
Blast furnace operations with high productivity and high coal injection, need coke with increasing size and high mechanical properties. This result can be obtained with a given coking blend and a constant production, only by modifying heating conditions in coke ovens. To obtain the best possible mechanical resistance, a fast heating rate before solidification is necessary for good grain agglutination, and subsequently a slow carbonisation rate is required to reduce the development of fissuration. In a classical coking plant it is only possible to optimise the global heating conditions, but the use of an autonomous coke oven could give more flexibility. Tests were performed in different thermal conditions with the same coal blend for a constant coking time (16 h). Coke abrasion strength was good and did not vary significantly in the studied range, and coke mean size and breakage index were increased. The least fissurised cokes were produced by a slow carbonisation rate (between 150 and 350 C) and low final temperature (900 C). This last parameter seems to have the greater influence.
Bibliographic Reference: EUR 13440 FR (1991) 76 pp., MF, ECU 4, blow-up copy ECU 10
Record Number: 199110727 / Last updated on: 1994-12-02
Original language: fr
Available languages: fr