国际煤地质学杂志(International Journal of Coal Geology)在2005年发表了褐煤腐植体显微组分的分类方案。由于我国没有低阶煤中腐植体的显微组分分类方案,因此“ICCP System 1994”中关于腐植体的显微组分的定义和分类方案对我国学者...国际煤地质学杂志(International Journal of Coal Geology)在2005年发表了褐煤腐植体显微组分的分类方案。由于我国没有低阶煤中腐植体的显微组分分类方案,因此“ICCP System 1994”中关于腐植体的显微组分的定义和分类方案对我国学者更具有特殊的意义。该显微组分分类方案(ICCP system 1994)在原分类方案的基础上,对腐植体显微组分的分类进行了修订,以便能够使其与其他显微组分,特别是镜质体分类中的相关术语更相匹配。该分类方案将腐植体显微组分为3个亚组,分别是结构腐植体亚组、碎屑腐植体亚组、凝胶腐植体亚组;每个显微组分亚组又分为2个显微组分,显微组分可以进一步分为显微亚组分以至显微组分种。虽然本分类方案主要针对的褐煤(指腐植体平均随机反射率低于0.4%的低阶煤,或称之木质褐煤),但适合于褐煤和亚烟煤,主要是因为镜质体和腐植体,以及次级的显微组分亚组之间具有对应的关系,因此,“ICCP system 1994”分类方案的腐植体和镜质体2种分类体系可以并行使用。目前,在显微组分以及细化的分类方面,研究者可根据低阶煤的性质和分析目的,选择腐植体和镜质体2个分类体系中的其中一种使用。这与新的ISO煤的分类方法一致。在ISO分类中,也涵盖了低阶煤,并且提出,对于低阶煤可联合使用腐植体和镜质体2种分类方法。展开更多
Four types of coals, KL, XB, ZS and GD with different coal ranks, were dissolved with the organic solvent N-methyl-2- pyrrolidone at 350 ℃ and around 3.0 MPa pressure to obtain thermal soluble constituents （TSCs）. ...Four types of coals, KL, XB, ZS and GD with different coal ranks, were dissolved with the organic solvent N-methyl-2- pyrrolidone at 350 ℃ and around 3.0 MPa pressure to obtain thermal soluble constituents （TSCs）. The yield, component and maceral group were investigated as well as their coking properties, including caking index and thermoplasticity. The results indicated that the yields of the four coals were of the following order： KL 〉 XB 〉 ZS 〉 GD. Based on the yield and the vitrinite content, coals were ranked from high to low. The ash contents of TSCs were significantly less than that of raw coals, and the TSCs contain more light components, leading to an increase in volatile matter. The patterns of Fourier transform infrared spectroscopy indicated that carbonyl was enriched in TSCs. Regarding the maceral group, TSCs were mainly composed of vitrinite which is the main reactive material and converts into binder phase in cokemaking process. Higher caking index values and fluidity were obtained in TSCs compared with the raw coals. The coking experiments with different amounts of TSCs addition were carried out. The results demonstrated that the proper TSCs addition could enhance the coke strength due to its high caking index and good fluidity.展开更多
文摘国际煤地质学杂志(International Journal of Coal Geology)在2005年发表了褐煤腐植体显微组分的分类方案。由于我国没有低阶煤中腐植体的显微组分分类方案,因此“ICCP System 1994”中关于腐植体的显微组分的定义和分类方案对我国学者更具有特殊的意义。该显微组分分类方案(ICCP system 1994)在原分类方案的基础上,对腐植体显微组分的分类进行了修订,以便能够使其与其他显微组分,特别是镜质体分类中的相关术语更相匹配。该分类方案将腐植体显微组分为3个亚组,分别是结构腐植体亚组、碎屑腐植体亚组、凝胶腐植体亚组;每个显微组分亚组又分为2个显微组分,显微组分可以进一步分为显微亚组分以至显微组分种。虽然本分类方案主要针对的褐煤(指腐植体平均随机反射率低于0.4%的低阶煤,或称之木质褐煤),但适合于褐煤和亚烟煤,主要是因为镜质体和腐植体,以及次级的显微组分亚组之间具有对应的关系,因此,“ICCP system 1994”分类方案的腐植体和镜质体2种分类体系可以并行使用。目前,在显微组分以及细化的分类方面,研究者可根据低阶煤的性质和分析目的,选择腐植体和镜质体2个分类体系中的其中一种使用。这与新的ISO煤的分类方法一致。在ISO分类中,也涵盖了低阶煤,并且提出,对于低阶煤可联合使用腐植体和镜质体2种分类方法。
基金This work was financially supported by the National Natural Science Foundation of China （Grant No. 51574023） and National Key Research and Development Program of China （2016YFB0600701）.
文摘Four types of coals, KL, XB, ZS and GD with different coal ranks, were dissolved with the organic solvent N-methyl-2- pyrrolidone at 350 ℃ and around 3.0 MPa pressure to obtain thermal soluble constituents （TSCs）. The yield, component and maceral group were investigated as well as their coking properties, including caking index and thermoplasticity. The results indicated that the yields of the four coals were of the following order： KL 〉 XB 〉 ZS 〉 GD. Based on the yield and the vitrinite content, coals were ranked from high to low. The ash contents of TSCs were significantly less than that of raw coals, and the TSCs contain more light components, leading to an increase in volatile matter. The patterns of Fourier transform infrared spectroscopy indicated that carbonyl was enriched in TSCs. Regarding the maceral group, TSCs were mainly composed of vitrinite which is the main reactive material and converts into binder phase in cokemaking process. Higher caking index values and fluidity were obtained in TSCs compared with the raw coals. The coking experiments with different amounts of TSCs addition were carried out. The results demonstrated that the proper TSCs addition could enhance the coke strength due to its high caking index and good fluidity.
