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Characteristics of high temperature C-CO2 gasification reactivity of Victorian brown coal char and its blends with high ash fusion temperature bituminous coal

机译：维多利亚褐煤炭及其与高灰熔融温度烟煤的混合物的高温C-CO2气化反应特性。

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This research paper explores the high temperature gasification reactivity of brown coal char and its potential for promoting the gasification of high-ash-fusion temperature bituminous coal under entrained-flow gasification conditions. Using thermogravimetric analysis (TGA), the C-CO2 gasification reactivity for a brown coal char and two bituminous coals with low/high ash contents and high ash fusion temperatures, as well as their blends were investigated over a temperature range of 900-1300 degrees C and atmospheric pressure. The nth order reaction rate equations were fitted based on a random pore model of the gasification reaction. The results show that the brown coal char has a high reactivity compared to the two bituminous coals, which mainly due to its more porous physical structure, whereas the catalytic effect of its ash-forming elements is insignificant above 1100 degrees C. The intrinsic activation energy was determined to be 154.5 kJ/mol for the brown coal char, which is lower than the higher activation energy of the two bituminous coals of 189.61 kJ/mol and 196.02 kJ/mol. Upon increasing the bituminous coal fraction, the activation energy increases stably due to the increased ash amount and increased molten ash that inhibit the gas diffusion. For the low-ash bituminous coal blended with 20-40% brown coal char, its C-CO2 reactivity is maximised at 1200 degrees C when the ash turns soft. Upon further increase of the temperature, its reactivity decreases due to the enhanced melting of the ash. Instead, for the high-ash bituminous coal, its addition of 20% to brown coal char is beneficial in decreasing the overall ash melting temperature. The C-CO2 gasification reactivity of 20% high-ash bituminous coal blended with brown coal char is maximised at 1100 degrees C when the ash turns soft and is minimised at 1200 degrees C when the ash is fully molten. (C) 2017 Elsevier Ltd. All rights reserved.
机译：本研究探讨了褐煤焦的高温气化反应性及其在气流床气化条件下促进高烟灰温度烟煤气化的潜力。使用热重分析（TGA），研究了在900-1300度的温度范围内对褐煤焦和两种灰分低/高，熔灰温度高的烟煤及其混合物的C-CO2气化反应性C和大气压。基于气化反应的随机孔模型拟合n阶反应速率方程。结果表明，与两种烟煤相比，褐煤焦具有较高的反应活性，这主要是由于其多孔的物理结构，而其成灰元素的催化作用在1100℃以上时微不足道。本征活化能对于褐煤炭，确定为154.5 kJ / mol，低于两种烟煤的较高活化能189.61 kJ / mol和196.02 kJ / mol。随着烟煤含量的增加，活化能稳定地增加，这归因于灰分量的增加和熔融灰分的增加，从而抑制了气体的扩散。对于掺有20-40％褐煤焦的低灰分烟煤，当灰分变软时，其C-CO2反应性在1200摄氏度时达到最大。随着温度的进一步升高，由于灰分的熔融增强，其反应性降低。相反，对于高灰分的烟煤，向褐煤焦中添加20％的煤有利于降低整体灰分熔化温度。当灰分变软时，将20％高灰分烟煤与褐煤焦混合的C-CO2气化反应性在1100℃时达到最大值，而在灰分完全熔融时在1200℃时达到最小。 （C）2017 Elsevier Ltd.保留所有权利。

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