褐煤脉冲式气流干燥传递过程研究

发布时间：2018-02-02 09:36

本文关键词： 脉冲式气流干燥气-固两相流数学模拟　出处：《化工进展》2017年07期 　论文类型：期刊论文

【摘要】：褐煤干燥是褐煤固体热载体新法干馏工艺的重要组成部分。本文对脉冲式气流干燥器内基于气-固两相流的褐煤干燥动量、热量、质量传递过程进行了研究。依托高效成熟的气流干燥技术,以颗粒在气流中的受力情况为基础,建立了气流干燥过程中颗粒加速运动的热量传递模型和颗粒减速运动的动量及热量传递模型,并提出了新的脉冲式气流干燥器高度的设计及优化方法。通过将脉冲式气流干燥器的干燥模拟数据与相同高度的等径式气流干燥器的数据进行对比,验证了脉冲式气流干燥的高效性,并根据烟气温度、颗粒湿含量、体积传热系数等模拟参数沿干燥器高度的分布情况对其高效性的原因进行了详细分析,为脉冲式气流干燥装置工艺设计提供准确的数据依据和理论参考。
[Abstract]:Lignite drying is an important part of the new distillation process of lignite solid heat carrier. This paper deals with the drying momentum and heat of lignite based on gas-solid two-phase flow in the pulse airflow dryer. The mass transfer process was studied. Based on the high efficient and mature airflow drying technology, based on the force of particles in the airflow. The heat transfer model of particle acceleration and the momentum and heat transfer model of particle deceleration in the process of airflow drying are established. A new design and optimization method for the height of pulse air dryer is proposed. The drying simulation data of pulse air dryer are compared with those of the same height equal diameter air flow dryer. The efficiency of pulse airflow drying was verified, and the reasons for the efficiency were analyzed in detail according to the distribution of simulated parameters such as flue gas temperature, particle moisture content and volumetric heat transfer coefficient along the height of the dryer. It provides accurate data basis and theoretical reference for the process design of pulse airflow drying device.
【作者单位】：中国核电工程有限公司河北分公司;大连市计量检测研究院;大连理工大学化工学院;
【分类号】：TD849.2
【正文快照】： 煤炭资源作为世界上储量最多、分布最广的常规能源,一直以来被世界各国重点开发和利用。国际能源署2011年报告指出[1],世界煤炭可采储量为9972亿吨,其中,褐煤为2687.6亿吨。根据2013年《BP世界能源统计年鉴》[2],中国煤炭生产和消费占全球比重分别为47.5%和50.2%。我国作为煤

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