低品位炭由来粘結材の化学構造とコークス強度との関連

摘要

Coke strength can be enhanced by adding HyperCoals(HPC). HPC can be produced from different rank of coals including low rank coals. The aim of this study is to investigate and evaluate the usability of HPC from low rank coals as caking additive. In this paper, ~1H-NMR, solid state ~(l3)C-NMR analysis, and elemental analysis were carried out to investigate the molecular structure of HPC prepared from low rank coals. The results showed that the number of aromatic rings in a unit structure increased from 1-2 in original coals to 2-3 in HPC extracted at 360℃. Effect of extraction temperature was also investigated and it was found that fraction of 3 aromatic rings increased in HPC extracted at 400℃ in comparison to HPC extracted at 360℃. The strength of cokes produced by adding HPC was directly a function of number of aromatic rings in the HPC and increased with increasing number or rings.%一般に高品質のコークスを製造するためには，強粘結炭の使用が不可欠である。しかし，強粘結炭は価格が高く，資源量も少ない。そのため，品質を低下させずに，可能な限り非微粘結炭の配合率を上げる技術が望まれている。通常，非微粘結炭の配合率の増加に伴いコークス強度も低下するが，溶剤抽出から得られるHyperCoal(HPC)を添加することで，強度を回復または向上させることができる。