ABSTRACT

In this study, three high-ash Indian sub-bituminous coals of different thermal maturities from three different open cast mines of Raniganj basin, eastern India, were studied to understand their combustion and pyrolysis behavior. The combustion analyses were performed under three different heating rates (5°C, 10°C, and 15°C/min). From the thermograms of TG-DTG pyrolysis curves, it was observed that the overall pyrolysis reaction can be deduced into four different temperature regions with each region showing unique properties, and those regions are inherent moisture loss, prior to primary pyrolysis, primary pyrolysis, and secondary pyrolysis regions. The main pyrolysis reaction occurs in the primary pyrolysis region for all the samples but a significant devolatilization has also been seen for the early oil window mature noncoking coal in the secondary pyrolysis region. The kinetic parameters were also evaluated for both combustion and pyrolysis analysis. X-ray diffraction revealed that this sample consists of a significant amount of siderite and pyrite, and consequently showed distinct behavior. It was observed that the pyrolysis properties and kinetics were closely related to their complex mechanisms and reactions. Rock-Eval pyrolysis also confirmed the presence of siderite in the sample, which decomposed simultaneously with the organic-matter during pyrolysis.

摘要

在这项研究中，研究了来自印度东部拉尼甘杰盆地三个不同露天矿的三种不同热成熟度的高灰分印度次烟煤，以了解它们的燃烧和热解行为。在三种不同的加热速率（5°C、10°C 和 15°C/min）下进行燃烧分析。从 TG-DTG 热解曲线的热谱图可以看出，整个热解反应可以推导出为四个不同的温度区域，每个区域都表现出独特的性质，这些区域是固有水分损失，在初级热解、初级热解和二次热解区。所有样品的主要热解反应都发生在一次热解区，但在二次热解区的早期油窗成熟非焦煤也出现了显着的脱挥发分。还对燃烧和热解分析的动力学参数进行了评估。X 射线衍射显示该样品由大量菱铁矿和黄铁矿组成，因此表现出不同的行为。据观察，热解性质和动力学与其复杂的机理和反应密切相关。Rock-Eval 热解还证实样品中存在菱铁矿，它在热解过程中与有机物同时分解。X 射线衍射显示该样品由大量菱铁矿和黄铁矿组成，因此表现出不同的行为。据观察，热解性质和动力学与其复杂的机理和反应密切相关。Rock-Eval 热解还证实样品中存在菱铁矿，它在热解过程中与有机物同时分解。X 射线衍射显示该样品由大量菱铁矿和黄铁矿组成，因此表现出不同的行为。据观察，热解性质和动力学与其复杂的机理和反应密切相关。Rock-Eval 热解还证实样品中存在菱铁矿，它在热解过程中与有机物同时分解。