Characteristic of cohesiveness-temperature of coal molten ash and its adaptability to entrained flow gasifier

doi:10.3969/j.issn.0438-1157.2012.10.034

CIESC Journal ›› 2012, Vol. 63 ›› Issue (10): 3243-3254.DOI: 10.3969/j.issn.0438-1157.2012.10.034

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Characteristic of cohesiveness-temperature of coal molten ash and its adaptability to entrained flow gasifier

ZHOU Zhijie, LI Dexia, LIU Xia, YU Guangsuo

Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

Received:2012-01-09 Revised:2012-05-17 Online:2012-10-05 Published:2012-10-05
Supported by:
supported by the National Basic Research Program of China(2010CB227004),the National Natural Science Foundation of China(21006026,20876048)and the High-tech Research and Development Program of China(2011AA050106).

煤灰熔融黏温特性及对气流床气化的适应性

周志杰, 李德侠, 刘霞, 于广锁

华东理工大学煤气化及能源化工教育部重点实验室, 上海 200237

通讯作者: 周志杰
作者简介:周志杰(1974- ),男,副教授。
基金资助:
国家重点基础研究发展计划项目(2010CB227004);国家自然科学基金项目(21006026,20876048);国家高技术研究发展专项经费资助项目(2011AA050106)。

Abstract

Abstract: Based on CaO and Fe₂O₃ content in coal ash,21 typical Chinese coal samples are categorized into low-calcium-low-ferric,medium-calcium-medium-ferric,medium-calcium-high-ferric,high-calcium-low-ferric,and high-calcium-high-ferric.The characteristic of cohesiveness-temperature of coal molten ash was measured by a high-temperature rotary viscometer,Factsage.The thermodynamic equilibrium of their molten states was calculated and the relationship between liquid molten slag,solid mineral crystal and viscosity of the slag was studied.Influences of initial SiO₂/Al₂O₃ mass ratio,solid crystals and composition of liquid-slag on the behavior of coal ash melting and characteristic of cohesiveness-temperature of the molten slag were analyzed and discussed in detail.A simple and practical method based on ash composition data of coal is provided to predict coal ash melting behavior and evaluate adaptability to entrained flow gasifier.The order of coal adapting to liquid-state slagging of entrained flow gasifier could be,from high to low,as follows:medium-calcium-high-ferric,high-calcium-low-ferric,medium-calcium-medium-ferric,low-calcium-low-ferric,and high-calcium-high-ferric.

Key words: coal, CaO, Fe₂O₃, viscosity dependency on temperature, FactSage

摘要： 以21个中国典型煤样为研究对象,根据煤灰中CaO和Fe₂O₃含量,将之分为低钙低铁类、中钙中铁类、中钙高铁类、高钙低铁类、高钙高铁类等类别。利用高温黏度计测量煤灰熔渣黏温特性,并利用计算软件FactSage对煤灰熔融状态进行热力学平衡计算,研究了液相熔渣及固体矿物质结晶与熔渣黏度的关系,分析整理了煤灰最初硅铝比(SiO₂/Al₂O₃)、固体结晶物以及液相熔渣组成3个因素对煤灰熔融特性和熔渣黏温特性的影响,为根据煤灰组分分析来预测不同煤的熔渣黏温特性及对气流床气化的适应性提供了一个简单而实用的判断方法。对气流床气化液态排渣的适应性从高到低依次为:中钙高铁类、高钙低铁类、中钙中铁类、低钙低铁类和高钙高铁类。

关键词: 煤灰, CaO, Fe₂O₃, 黏温特性, FactSage

CLC Number:

TQ534

ZHOU Zhijie, LI Dexia, LIU Xia, YU Guangsuo. Characteristic of cohesiveness-temperature of coal molten ash and its adaptability to entrained flow gasifier[J]. CIESC Journal, 2012, 63(10): 3243-3254.

周志杰, 李德侠, 刘霞, 于广锁. 煤灰熔融黏温特性及对气流床气化的适应性[J]. 化工学报, 2012, 63(10): 3243-3254.

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Characteristic of cohesiveness-temperature of coal molten ash and its adaptability to entrained flow gasifier

煤灰熔融黏温特性及对气流床气化的适应性

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