Coke Oven Techniques, 1st Edition by C. Polfer (auth.)

By C. Polfer (auth.)

The expanding scale and depth of contemporary blast-furnace operation, mixed with a simultaneous relief in coke price, have resulted in extra stringent coke caliber requisites with a better emphasis at the coke's (1 2) position as a burden spacer ' • as a result, coke caliber facts restricted to chemical composition, preliminary dimension grading and ambient dimension balance are inadequate to foretell the coke's behaviour in use. a pragmatic verify­ ment of the most probably functionality of coke must also think about its resistance to degradation within the chemical and thermal atmosphere of the blast furnace. A try is, for that reason, wanted which simulates so far as attainable the mechanical, chemical and thermal stipulations of the smelting approach and measures the consequent alterations in measurement distribution of the coke, and as a result in its bulk permeability to fuel movement, utilizing consultant samples of the feed coke as charged to the furnace. furthermore, new advancements in coke construction make it essential to re-examine coke checking out with a purpose to advisor the coke manufacturer in making the easiest use of obtainable coals. The mode of mechanical coke breakage at ambient temperature has been broadly characterized and with regards to adjustments within the coke's bulk permeability(3). against this, the explanations of degradation within the sizzling energy and dimension of bulk coke bobbing up from its partial gasification with carbon dioxide and reheating to extreme temperature are really much less explored. the current paper describes the v.

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Aderibidge - Abstracts 40th Ironmaking Conference, March 29-April 1, 1981, Toronto (Canada) IIS of AlME. 43) R. Limpach - Rapport final Convention CCE no. 62l0-AA/5/ 502, 1979. 44) M. Hatano, o. Kohji, H. Yamaoka, C. Yamagata - Trans. ISIJ, Vol. 20, no. 7, 1980, p. 256. 45) Rapp. Tecn. Convenzione CEE no. 72l0-AA/405 Italsider, Sept. 1980. J. Schultz, (BISI 13043). 47) o. o. Obel - Gllickauf, 110, Vol. 13, p. J. Schultz - Hl, January 1972, p. 1-11. 48) W. Peters, J. Lehman - "Erd6l und Kohle Erdgas Petrochemie" February 1965, no.

Referring in particular to the teats done with ANCIT, FMC and HNBC, we can identify not only the probl... formed coke may bring, but also the prospects it offers for improvements in blast furnace operations: CA) Because of the shape of the briquettes, a stack of formed - 40 - coke may have a lower voids index than sized coke, resulting also in low permeability in the zone of contact with the sinter burden. Thus even if only part of the traditional coke is replaced by formed coke, there may be a certain drop in the permeability of the bosh, leading to some difficulty in keeping up productivity levels when operating with coke alone (43).

29 - The fact that hydrocarbons (fuel oil and natural gas) are now more costly than coal, combined with predictions that this price differential will be maintained in the future in spite of increased coal demand for energy production, means that hydrocarbons are rapidly being eliminated from blast furnace operations. Fuel oil injection in blast furnaces used to have a number of economic advantages, and it facilitated certain significant improvements in the running of blast furnaces. 3 kg of coke.

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