单颗粒褐煤高温烟气干燥过程数值模拟

doi:10.11949/j.issn.0438-1157.20151207

化工学报 ›› 2016, Vol. 67 ›› Issue (4): 1534-1540.DOI: 10.11949/j.issn.0438-1157.20151207

单颗粒褐煤高温烟气干燥过程数值模拟

赵孟浩¹, 张守玉¹, 董建勋², 李尤¹, 丁艳军³, 吕俊复³

1. 上海理工大学能源与动力工程学院热能工程研究所, 上海 200093;
2. 中电投蒙东能源集团有限责任公司, 内蒙古通辽 028000;
3. 清华大学热能工程系, 北京 100084

收稿日期:2015-07-27 修回日期:2015-09-16 出版日期:2016-04-05 发布日期:2016-04-05
通讯作者: 张守玉
基金资助:
国家科技支撑计划项目(2012BAA04B01)。

Numerical simulation of single lignite particle drying process in high temperature flue gas

ZHAO Menghao¹, ZHANG Shouyu¹, DONG Jianxun², LI You¹, DING Yanjun³, LÜ Junfu³

1. Department of Thermal Engineering, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
2. CPI Mengdong Energy Group Co., Ltd., Tongliao 028000, Inner Mongolia, China;
3. Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

Received:2015-07-27 Revised:2015-09-16 Online:2016-04-05 Published:2016-04-05
Supported by:
supported by the National Science & Technology Pillar Program (2012BAA04B01).

摘要/Abstract

摘要：

褐煤干燥对于提高其品质具有重要意义。为了模拟高温烟气干燥这一高温差、变温差非稳态传热传质过程中褐煤内水分蒸发过程,采用有限体积法建立了一维球坐标系下蒸发界面向内迁移的单颗粒褐煤干燥数学模型,并利用该模型分析了初始烟气温度和颗粒粒径对单个褐煤颗粒干燥特性的影响。模型模拟结果与实验结果对比表明二者变化趋势一致,所建模型能较好地反映出高温烟气干燥过程中褐煤内水分蒸发过程。结果表明,初始烟气温度越高,颗粒粒径越小,蒸发界面向内迁移速度越快,水分脱除越快,干燥时间越短;蒸发界面平均迁移速度均与初始烟气温度和颗粒粒径呈线性关系;在初始烟气温度700℃下,较短的停留时间使得颗粒表面温度未达到挥发分析出温度,本研究中不同粒径褐煤颗粒在干燥过程中基本没有挥发分的析出。

关键词: 单颗粒, 褐煤, 高温烟气, 干燥, 传热, 传质, 数值模拟

Abstract:

Lignite drying is very important for improvement of lignite quality. In order to simulate evaporation process of water in lignite particle during drying in high temperature flue gas, a mathematical model was established for the unsteady drying process of single lignite particle at high and variable temperature using finite volume method, and the fundamental assumption made was that the lignite particle was spherical and could be divided into two parts in one-dimensional spherical coordinate system by water evaporation interface that migrates inwards during drying. The model was used to analyze the drying behavior of lignite particle with time and the effect of initial temperature of flue gas and particle size. The variation trend obtained by numerical simulation was similar to that did by experiments for drying process. It was found that the higher initial flue gas temperature and the smaller particle size lead to the faster migration velocity of the water evaporation interface, the lower moisture content of lignite particle and the shorter drying time. There is a linear relationship between the interface migration velocity and the initial flue gas temperature and lignite particle size.

Key words: single particle, lignite, high temperature flue gas, drying, heat transfer, mass transfer, numerical simulation

中图分类号:

TQ536.1

赵孟浩, 张守玉, 董建勋, 李尤, 丁艳军, 吕俊复. 单颗粒褐煤高温烟气干燥过程数值模拟[J]. 化工学报, 2016, 67(4): 1534-1540.

ZHAO Menghao, ZHANG Shouyu, DONG Jianxun, LI You, DING Yanjun, LÜ Junfu. Numerical simulation of single lignite particle drying process in high temperature flue gas[J]. CIESC Journal, 2016, 67(4): 1534-1540.

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单颗粒褐煤高温烟气干燥过程数值模拟

Numerical simulation of single lignite particle drying process in high temperature flue gas

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