PL151963B3 - Coal mix for production of high-quality blast furnace coke,especially dry-quenched - Google Patents

Description

REPUBLIC ΛΑΙ Al / I PATENT DESCRIPTION 151 963 POLAND Additional patent UTUtLU to Patent No. 150,422 Q UP L H A Reported: 87 04 10 / P. 265131 / Priority ---- Int. Cl. ⁵ C10B 57/04 OFFICE PATENT Application announced: 88 12 22 RP Patent description published: 1991 03 29

Creators of the invention: Piotr Wasilewski, Piotr Dybała, Andrzej Mianowski, Andrzej Przybyła, Stanisław Miearańński

The holder of the patent: Silesian University of Technology named after W. Pstrowski »

Gliwice / Poland /

Kombinat Metallurgiczny - Huta Katowice Zakład Koksowniczy PRZYJAŹŃ, Dąbrowa Górnicza / Poland /

COAL BLEND FOR THE PRODUCTION OF HIGH-QUALITY BLAST FURNACE COKE, ESPECIALLY DRY SLIMMED

The subject of patent No. 150 422 is a coal blend for the production of high-quality blast furnace coke in a charging system, especially dry-slaked, containing orthocoking coal or a mixture thereof and at least 5% by weight of coals with a content of volatiles V above 31% and with a modified cokeability number above 0 , where the share of individual carbons determined by the volatile matter content is closed with the amount of 26% <V

30%, preferably 27-29%, it is furthermore preferred that this component is ground to a grain size of 90 * 5% of grains below 3 mm. In a particular case, the coal mixture contains daf

50-80% by weight of orthocoking coal with V> 26% and the proportion of inertinite I <30%, 10-40% by weight of orthocoking coal with a volatile content of 20% ^ ν ^ ^β ^ 26% and the proportion of inertinite I> 30-50% and coals with volatile matter content ν θ ^> 31%, modified cokeability number G _K > 0 in the amount of 5-15% by weight.

The composition of the carbon blend has been selected so that there is no need to use additives / coals, coke / slimming, as well as to eliminate in the blend the most noble orthocox carbons with a volatile content of 20% ^. V ^ ^a ^^ 26% and the proportion of intertinite I < 30%, while the role of slimming ingredients in the mixture is played by orthocox carbons with an increased content of inertinites.

It turned out that it is advantageous to use additionally finely divided coke breeze from coke dedusting installations in the mixture, starting from its ejection from the coking chamber to the sorting plant, in an amount of up to 5% by weight.

In this case, such a coke breeze prevents the formation of a crack pattern by reducing thermal and mechanical stresses, which increases the strength and slightly reduces the abrasiveness of coke.In addition, the density increases in this area of use.

151 953

151,963 bulk charge by the value of approximately (%): 100 X / (100-X.) ₉ where X is the mass fraction of coke breeze in% by weight, and therefore the yield of coarse grades increases proportionally.

'The quality of coke breeze depends on where it is taken from the dedusting installations. The graining range varies from about 100% below 0.2 mm to about 100% below 2 mm. The ash content is a derivative of the coals used and is in the order of 10-15%, while the content of volatile parts is 1.0-1.5%. The use of coke breeze from dedusting installations not only stabilizes the coke quality, but above all enables the coking process to be carried out in a closed cycle by using waste coke breeze in the coke oven battery in combination with the coal mixture according to patent No. 150 422.

Claims (2)

Patent claims 1. Coal blend for the production of high-quality blast furnace coke, especially dry-slaked, containing orthocoking coal or a mixture of orthocoking coals and at least 5% by weight of coals with a volatile content of V ^ ^a ^> 31% and a modified cokeability number G ^ ^ O, preferably with fragmentation of 90 ± 5% of grains below 3 mm, and the share of individual knots, indirectly determined by the volatile matter content, is closed in the coal mixture by the amount of 26% ^ ν ^ ^β ^ 30%, preferably 27-29% according to patent No. 150 422, characterized by that it contains up to 5% by weight of coke breeze from coke dedusting installations, starting from its ejection from the coking chamber to the sorting plant. 2. Coal blend for the production of high-quality blast furnace coke, especially dry-slaked, consisting of 50-80% by weight of orthocoking coal ov ^ ^a ^> 26% and the content of inertinite I <30%, 10-40% by weight of orthocoking coals with volatile content 20% 4, V ^ ^a ^ 26% and the proportion of inertinite I> 30-50% and coals with a volatile content of 31% and a modified cokeability number G _K ) 0 in an amount of 5-15% by weight, preferably with a fineness of 90 + 5% grain size smaller than 3 mm, according to patent No. 150,422, characterized in that it contains up to 5% by weight of coke breeze from coke dedusting installations, starting from its ejection from the coking chamber to the sorting plant, inclusive. Department of Publishing of the UP RP. Circulation 100 copies Price: PLN 3,000