Relationship between pore structure and moisture reabsorption of lignite dewatered by high temperature drying process

Yuanmo WU; Shouyu ZHANG; Hua ZHANG; Chen MU; Hao LI; Xiaobing SONG; Junfu LYU

doi:10.11949/j.issn.0438-1157.20180822

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Relationship between pore structure and moisture reabsorption of lignite dewatered by high temperature drying process

Energy and environmental engineering | 更新时间：2020-06-24

- Relationship between pore structure and moisture reabsorption of lignite dewatered by high temperature drying process
- CIESC Journal Vol. 70, Issue 1, Pages: 199-206(2019)
- 作者机构：
  
  1.上海理工大学能源与动力工程学院，上海 200093
  2.清华大学能源与动力工程系，北京 100084
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180822
  CLC： TQ 536.1
- Received：23 July 2018，
  
  Revised：2018-10-18，
  
  Published：05 January 2019
- 稿件说明：
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吴渊默, 张守玉, 张华，慕晨, 李昊, 宋晓冰, 吕俊复. 高温干燥对褐煤孔隙结构及水分复吸的影响[J]. 化工学报, 2019, 70(1): 199-206

WU Yuanmo, ZHANG Shouyu, ZHANG Hua， MU Chen, LI Hao, SONG Xiaobing, LYU Junfu. Relationship between pore structure and moisture reabsorption of lignite dewatered by high temperature drying process[J]. CIESC Journal, 2019, 70(1): 199-206
吴渊默, 张守玉, 张华，慕晨, 李昊, 宋晓冰, 吕俊复. 高温干燥对褐煤孔隙结构及水分复吸的影响[J]. 化工学报, 2019, 70(1): 199-206 DOI： 10.11949/j.issn.0438-1157.20180822.

WU Yuanmo, ZHANG Shouyu, ZHANG Hua， MU Chen, LI Hao, SONG Xiaobing, LYU Junfu. Relationship between pore structure and moisture reabsorption of lignite dewatered by high temperature drying process[J]. CIESC Journal, 2019, 70(1): 199-206 DOI： 10.11949/j.issn.0438-1157.20180822.

摘要

利用卧式固定床实验炉制得不同温度下干燥处理的煤样，采用低温氮吸附法测试煤样的比表面积、孔体积和孔径分布等孔隙特征参数，使用复吸实验装置测定不同干燥程度褐煤煤样的平衡含水量，探索了高温干燥处理后褐煤孔隙结构的演变与其复吸特性之间的关联规律。结果表明：褐煤原煤及不同干燥温度(600~800℃)下半焦的等温吸附曲线均属于第Ⅱ类吸附等温线，褐煤原煤、600℃和700℃干燥半焦的吸附回线均属于L1型，800℃干燥半焦的吸附回线有从L1型转变为L2型的趋势；随着干燥温度的增加，干燥半焦的比表面积先增大后减小，介孔峰值的孔径微分同样先增大后减小，而大孔孔径微分基本保持不变；分形维数

和

呈相反的变化趋势，且

；不同干燥程度半焦的复吸曲线变化趋势相同，且平衡含水量随着干燥温度的升高而减小；半焦复吸特性与孔隙结构有关，平衡含水率与其孔容积之间呈较好的线性关系。

Abstract

The coal samples dried at different temperatures were prepared by horizontal fixed bed experimental furnace. The specific surface area

pore volume and pore diameter distribution of the coal samples were determined using nitrogen adsorption isotherm (-196℃). The relationship between the pore structure and moisture reabsorption behavior of the lignite samples was investigated using a self-designed reabsorption device. The experimental results show that the N

adsorption behavior of the semi-coke dried under different temperatures followed the type II adsorption isotherm

and the adsorption loops of the (raw coal and the semi-coke prepared under 600 and 700℃) belonged to type L1

while the adsorption loop of the semi-coke dried at 800℃ showed a transformation tendency from type L1 to type L2. With the increasing of drying temperature

the specific surface area of the dried semi-coke first increased slowly and then decreased and the pore diameter differential corresponded to the mesopore peak showed the same trend. Meanwhile

the pore diameter differential of the macropores remained unchanged. As the drying temperature increased

the fractal dimensions

and

changed in the opposite trends

and the value of

was higher than

. The moisture reabsorption behaviors of the semi-coke followed the same trend

and the equilibrium moisture content decreased with the increasing drying temperature. The moisture reabsorption characteristics of the semi-coke were closely related to the pore structure

and the equilibrium moisture content had a good linear relationship with the pore volume.

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references

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