2024 年 110 巻 5 号 p. 395-403
In our previous paper, a new measurement method for the coal adhesion property called “surface tension of semi-coke” was devised. The surface tension of a semi-coke sample obtained by heat treatment of a coal sample at 500°C was measured as a unique adhesion property. Conventionally, it has been thought that adhesion is dominant under a low MF (Gieseler maximum fluidity) condition. Moreover, it is important for effective coal utilization to develop a technique that enables production of high strength coke under low MF conditions, which has been thought to deteriorate coke strength. However, in the previous paper, the effect of surface tension on coke strength was investigated only under a single MF condition without changing the level of MF.
In this paper, the effects of surface tension on coke strength under adhesion dominant conditions (low MF and high TI (total inert content)) were investigated. As a result, it was found that the effect of surface tension on coke strength was significant when MF was low or TI was high. Therefore, it is considered that high strength coke can be produced even under low-grade conditions (low MF or high TI) by controlling surface tension. Finally, based on the results, the concept of the conventional MOF diagram was extended. This technique enables effective selection and utilization of coal resources.
