以 K2CO3 为催化剂的超临界水煤气化过程中钾失活规律研究

IF 3.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL Journal of Supercritical Fluids Pub Date : 2024-08-12 DOI:10.1016/j.supflu.2024.106375
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引用次数: 0

摘要

K2CO3 在煤的超临界水气化(SCWG)中具有良好的催化作用。然而,研究人员主要关注煤的气化效果,而对钾的传质过程研究甚少。本文通过实验获得了煤在超临界水气化过程中钾的分布规律以及影响钾失活的因素。通过对煤炭超临界水分解后残留物的检测和分析,发现钾只以液态和固态两种形式存在,残留物中的钾以不溶性硅铝钾的形式存在,不具有催化作用。反应温度越高,反应时间越长,煤中硅铝含量越高,钾的失活率也越高。煤气化残渣中钾和铝的摩尔含量呈线性相关,比例约为 1:1。降低煤中铝的含量可以有效减少钾的失活。在鹤壁煤的 SCWG 中,酸洗后钾的失活率从 80.88% 降至 17.75%。在无灰份煤的SCWG中,每次实验后的碳气化效率(CE)和液体中的钾含量都在95%以上,钾没有失活,残留的钾溶液在无灰份煤的SCWG后仍然有效。
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Study of potassium deactivation rule in supercritical water gasification of coal with K2CO3 as catalyst

K2CO3 has a good catalytic effect in supercritical water gasification (SCWG) of coal. However, researchers have mainly focused on the effects of coal gasification, while the potassium mass transfer process has rarely been studied. Herein, the distribution pattern of potassium during the SCWG of coal and the factors influencing potassium deactivation were experimentally obtained. Through the detection and analysis of the residues after the SCWG of coal, it is found that potassium only exists in the forms of liquid and solid and the potassium in the residue exists in the form of insoluble potassium silica alumina, which does not have a catalytic effect. At a high reaction temperature, the reaction time is longer, and when the silica–aluminum content in coal is higher, the potassium deactivate rate is also higher. The molar contents of potassium and aluminum in the coal gasification residue are linearly correlated, with a ratio of approximately 1:1. Reducing the aluminum content in coal can effectively reduce potassium deactivation. In the SCWG of the Hebi coal, the deactivation rate of potassium reduced from 80.88 % to 17.75 % after acid washing. In the SCWG of the ash-free coal, the carbon gasification efficiency (CE) and potassium content in the liquid were above 95 % after each experiment, there was no deactivation of potassium, and the residual potassium solution remained catalytically effective after the SCWG of the ash-free coal.

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来源期刊
Journal of Supercritical Fluids
Journal of Supercritical Fluids 工程技术-工程:化工
CiteScore
7.60
自引率
10.30%
发文量
236
审稿时长
56 days
期刊介绍: The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.
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