The effect of various oxygen-containing compounds added and/or inherent O-species on coal fluidity and coke strength has been investigated in detail. When several O-containing compounds, which have different O-containing groups, are added independently to caking coal, the MF value almost decreases, and the extent of the decrease being ether < ketone < lactone < hydroxyl < acid anhydride < < ether/hydroxyl/lactone < carboxyl group. The COOH content in four coals used increases with decreasing C%, and the MF values decrease with increasing the content. The evolution of gaseous O-containing species (CO, CO₂, and H₂O) during carbonization at 3 °C/min of four coals up to 400 °C has been studied mainly with a flow-type quartz-made fixed-bed reactor to clarify the effect of the amount of O-containing gases evolved with the Gieseler fluidity of coal particles. A positive correlation is found between the amount of CO, CO₂, or H₂O evolved up to 400 °C and the COOH content in coal. However, a negative correlation between MF and O-containing gases evolved up to 400 °C is observed. It is suggested that the COOH amount and/or O-containing gases evolved have adverse effects on the thermoplasticity of coal. When the indirect tensile strength of coke prepared from pelletized samples is plotted against MF values, a positive correlation is found, whereas an inverse correlation is observed between the indirect tensile strength and COOH in coals used or the O-containing gases evolved up to 400 °C during carbonization. These observations indicate that some of the oxygen-functional groups naturally present in coal have a negative effect on coal fluidity and that this effect is particularly strong in carboxyl, which can readily be decomposed into gaseous oxygen-containing species during heating up to the initial softening temperature.

中文翻译：

---

固有存在的氧官能团对煤流动性和焦炭强度的影响

已经详细研究了添加的各种含氧化合物和/或固有的O形态对煤流动性和焦炭强度的影响。当将几种具有不同含O基团的含O化合物独立地添加到粘结煤中时，MF值几乎降低，降低程度为醚<酮<内酯<羟基<酸酐<<醚/羟基/内酯<羧基。所用四种煤的COOH含量随C％的降低而增加，而MF值随含量的增加而降低。气态含O物质（CO，CO ₂和H ₂O）主要通过流式石英固定床反应器研究了以3°C / min的速度在4°C至400°C的四种煤的碳化过程，以阐明Gieseler释放出的含O气体量的影响煤颗粒的流动性。在CO，CO ₂或H ₂的量之间发现正相关O释放到400°C，煤中的COOH含量增加。但是，观察到高达400°C的MF和O气体之间呈负相关。建议产生的COOH量和/或含O气体对煤的热塑性有不利影响。当将制粒样品制备的焦炭的间接抗张强度与MF值作图时，发现正相关，而所用煤或高达400°C的含O气体中的间接抗张强度与COOH之间却呈负相关。碳化过程中的碳。这些观察结果表明，煤中天然存在的某些氧官能团对煤的流动性具有负面影响，而这种影响在羧基中尤为明显，