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A study on Thermoplastic Property of Strongly Caking Coals and Its Influence on Coke Structures
Coke and Chemistry Pub Date : 2022-07-20 , DOI: 10.3103/s1068364x2204007x
Weizhou Sun, Ping Cui, Mingdong Zheng, Xiaoyong Zhang

Abstract

According to the coking mechanism, the physical extension of the metaplast during the thermoplastic phase will directly affect the pore and pore wall structures of the coke, however, there was no corresponding thermoplastic characteristic expressing this property. In this paper, several strongly caking coals were selected as samples. It was found that the morphologies of the resulting coking products with a similar rank can be divided into expansion and spreading morphology through a crucible carbonization test for vitrinite particles, which verified the difference of metaplast physical extension during thermoplastic phase. This study proposed a new thermoplastic property, i.e., surface tension of metaplast, and considered it was the internal factor affecting the degree of physical extension. The surface tensions of metaplast for different strongly caking coals were characterized through mobility and ductility experiments, the results showed that metaplast with a lower surface tension would perform a higher mobility and a ductility. To studied the effects of metaplast surface tension on the structure of coke, a carbonized test was carried out. The result suggested that strongly caking coals with a low surface tension was likely to form a coke structure with a higher porosity, larger average pore diameter, and higher proportion of thinner pore walls, indicating that the ratio of strongly caking coal with a low surface tension to coal blending should be minimized. Moreover, through the study of the conventional thermoplastic index for different strongly caking coals, it could simply judge the difference of metaplast surface tension by its logMF/TD.



中文翻译:

强粘结性煤的热塑性及其对焦炭结构影响的研究

摘要

根据焦化机理,变质体在热塑性阶段的物理延伸将直接影响焦炭的孔和孔壁结构,但没有相应的热塑性特性表现出这种性质。本文选取了几种强粘结性煤作为样品。通过对镜质体颗粒进行坩埚碳化试验发现,所得焦化产物具有相近等级的形貌可分为膨胀形貌和铺展形貌,验证了热塑性相变质体物理伸长的差异。本研究提出了一种新的热塑性塑料特性,即变体的表面张力,并认为它是影响物理延伸程度的内在因素。通过流动性和延展性实验表征了不同强粘结煤的变质体的表面张力,结果表明表面张力较低的变质体具有较高的流动性和延性。为研究变质体表面张力对焦炭结构的影响,进行了炭化试验。结果表明,低表面张力强粘结性煤容易形成孔隙率较高、平均孔径较大、孔壁较薄的比例较高的焦炭结构,说明低表面张力强粘结性煤的比例较高。应尽量减少配煤。此外,通过研究不同强粘结煤的常规热塑性指数,

更新日期:2022-07-21
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