Study on the process of the flue gas fluidized lignite drying and unsteady heat and mass transfer

YANG Xiujuan; YAN Weiping

doi:10.19666/j.rlfd.201706044

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Study on the process of the flue gas fluidized lignite drying and unsteady heat and mass transfer

Thermal Power Generation Vol. 47, Issue 4, Pages: 1-8(2018)

更新时间：2025-09-28

- Study on the process of the flue gas fluidized lignite drying and unsteady heat and mass transfer
- 作者机构：
  
  华北电力大学(保定)能源动力与机械工程学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201706044
  CLC： TK229.66
- Published Online：09 April 2018，
  
  Published：2018
- 稿件说明：
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YANG Xiujuan, YAN Weiping. Study on the process of the flue gas fluidized lignite drying and unsteady heat and mass transfer[J]. Thermal Power Generation, 2018, 47(4): 1-8.
DOI：

YANG Xiujuan, YAN Weiping. Study on the process of the flue gas fluidized lignite drying and unsteady heat and mass transfer[J]. Thermal Power Generation, 2018, 47(4): 1-8. DOI： 10.19666/j.rlfd.201706044.

摘要

为反映褐煤颗粒的实际干燥过程

为流化床烟气干燥褐煤的设计参数提供一定的参考

本文在非稳定边界条件下

建立了流化状态下褐煤颗粒非稳态干燥升温模型

采用龙格库塔法

对描述物料干燥过程的微分方程式进行计算模拟

得出褐煤干燥过程中褐煤颗粒含水量、温度以及烟气温度等随时间的变化规律。结果表明:烟气初温为260、200、140℃

干燥速率分别为0.076、0.068、0.054 kg/min;粒径为1、3、5、7 mm

干燥速率分别为0.074、0.068、0.065、0.062 kg/min;烟气流速为2.8、2.5、2.0 m/s

干燥速率分别为0.068、0.074、0.076 kg/min;床层厚度为120、200、300 mm时

干燥速率分别为0.076、0.073、0.068 kg/min

推荐褐煤干燥时间分别为3~4、4~5、5~6 min。褐煤较佳目标含水量为10%左右

干燥温度140~260℃较为适宜。

Abstract

In order to reflect the actual drying process of lignite particles and provide reference for design parameters of fluidized bed gas drying lignite system

this study establishes an unsteady drying and temperature rising model of lignite particles under fluidization state based on the unsteady boundary conditions.Using the Runge-Kutta

the differential equations describing the drying process of lignite particle are simulated and calculated.And then the change rules of moisture content

temperature and flue gas temperature with time during the lignite drying process are obtained.The results show that when the gas initial temperature is 260

200 or 140 ℃

the drying rate is 0.076

0.068 or 0.054 kg/min

respectively.When the particle size is 1

5 or 7 mm

the drying rate is respectively 0.074

0.068

0.065 or 0.062 kg/min.When the gas flow rate is 2.8

2.5 or 2.0 m/s

the drying rate is respectively 0.068

0.074 or 0.076 kg/min.When the bed thickness is 120

200 or 300 mm

the drying rate is respectively 0.076

0.073 or 0.068 kg/min

and the recommended drying time is 3~4 min

4~5 min or 5~6 min

respectively.The optimal target moisture content of lignite is about 10% and the suitable drying temperature is 140~260 ℃.

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