孔隙结构对褐煤干燥动力学的影响

TQ531; 研究了胜利和昭通褐煤在低温(60 ～140℃)干燥过程中孔隙结构的演变,计算了2种不同结构褐煤脱水过程的有效水分扩散系数(Deff),讨论了褐煤孔隙结构参数和水分扩散特性参数的关系.结果 表明,胜利褐煤的孔隙结构以开放的圆柱形孔隙、平行壁状狭缝孔和尖劈型毛细孔为主;而昭通褐煤以一端封闭的不透气性孔为主.随着干燥时间增加,2种褐煤比表面积均减小,平均孔径变化趋势与孔容变化相反.随着干燥温度升高,2种褐煤比表面积、孔容、平均孔径均增大,平均孔径变化趋势与孔容变化相同.关联动力学参数表明,煤样的孔容比及比表面积都与Deff有较好关联度,2种褐煤的孔容比与比表面积呈正相关;水分扩散系数更...

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Published in煤炭学报 Vol. 44; no. 3; pp. 949 - 956
Main Authors 曲啸洋, 李鹏, 周国莉, 张磊, 刘盼, 张婕
Format Journal Article
LanguageChinese
Published 郑州大学化工与能源学院,河南郑州,450001 01.03.2019
Subjects
有效水分扩散系数
褐煤
活化能
干燥动力学
孔隙结构
Online AccessGet full text
ISSN0253-9993
DOI10.13225/j.cnki.jccs.2018.0137

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Abstract TQ531; 研究了胜利和昭通褐煤在低温(60 ～140℃)干燥过程中孔隙结构的演变,计算了2种不同结构褐煤脱水过程的有效水分扩散系数(Deff),讨论了褐煤孔隙结构参数和水分扩散特性参数的关系.结果 表明,胜利褐煤的孔隙结构以开放的圆柱形孔隙、平行壁状狭缝孔和尖劈型毛细孔为主;而昭通褐煤以一端封闭的不透气性孔为主.随着干燥时间增加,2种褐煤比表面积均减小,平均孔径变化趋势与孔容变化相反.随着干燥温度升高,2种褐煤比表面积、孔容、平均孔径均增大,平均孔径变化趋势与孔容变化相同.关联动力学参数表明,煤样的孔容比及比表面积都与Deff有较好关联度,2种褐煤的孔容比与比表面积呈正相关;水分扩散系数更是与比表面积呈线性关系.胜利褐煤在孔径小于7 nm时孔容比随温度的升高而增大;而孔径区间介于7～10 nm的孔容比随温度的升高而减小.昭通褐煤在孔径小于10 nm的孔容比随温度的升高而增大;而孔径区间介于10 ～20 nm的孔容比随温度的升高而减小.2种褐煤的Deff均受微孔及较小孔径的中孔控制.同时,计算得出低温干燥过程胜利褐煤的活化能(16.95 kJ/mol)低于昭通褐煤(21.84 kJ/mol),这说明相同条件下胜利褐煤脱水所克服的能垒更低.
AbstractList TQ531; 研究了胜利和昭通褐煤在低温(60 ～140℃)干燥过程中孔隙结构的演变,计算了2种不同结构褐煤脱水过程的有效水分扩散系数(Deff),讨论了褐煤孔隙结构参数和水分扩散特性参数的关系.结果 表明,胜利褐煤的孔隙结构以开放的圆柱形孔隙、平行壁状狭缝孔和尖劈型毛细孔为主;而昭通褐煤以一端封闭的不透气性孔为主.随着干燥时间增加,2种褐煤比表面积均减小,平均孔径变化趋势与孔容变化相反.随着干燥温度升高,2种褐煤比表面积、孔容、平均孔径均增大,平均孔径变化趋势与孔容变化相同.关联动力学参数表明,煤样的孔容比及比表面积都与Deff有较好关联度,2种褐煤的孔容比与比表面积呈正相关;水分扩散系数更是与比表面积呈线性关系.胜利褐煤在孔径小于7 nm时孔容比随温度的升高而增大;而孔径区间介于7～10 nm的孔容比随温度的升高而减小.昭通褐煤在孔径小于10 nm的孔容比随温度的升高而增大;而孔径区间介于10 ～20 nm的孔容比随温度的升高而减小.2种褐煤的Deff均受微孔及较小孔径的中孔控制.同时,计算得出低温干燥过程胜利褐煤的活化能(16.95 kJ/mol)低于昭通褐煤(21.84 kJ/mol),这说明相同条件下胜利褐煤脱水所克服的能垒更低.
Author 曲啸洋
张磊
周国莉
李鹏
刘盼
张婕
AuthorAffiliation 郑州大学化工与能源学院,河南郑州,450001
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QU Xiaoyang
ZHOU Guoli
LI Peng
LIU Pan
ZHANG Lei
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Keywords 有效水分扩散系数
褐煤
活化能
干燥动力学
孔隙结构
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Snippet TQ531; 研究了胜利和昭通褐煤在低温(60 ～140℃)干燥过程中孔隙结构的演变,计算了2种不同结构褐煤脱水过程的有效水分扩散系数(Deff),讨论了褐煤孔隙结构参数和水分扩散特性...
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Title 孔隙结构对褐煤干燥动力学的影响
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