颗粒分布对吸附热变换器内传热传质的影响

发布时间：2018-11-18 19:37

【摘要】：采用直接接触法提高吸附热变换器内的传热传质速率,回收热水直接生成过热蒸汽。对蒸汽生成过程进行数值建模,耦合质量、能量和动量方程。气液固的三相计算被合理简化成两个由一个移动水-气界面连接的两相区域计算。模拟研究填充床内的沸石颗粒分布如松散-密集型和密集-松散型对蒸汽生成的影响。两种填充床生成蒸汽的总质量相同。密集-松散型生成蒸汽的时间短,但生成速率快。密集-松散型生成蒸汽与入水的时间比值为58.8%,生成的蒸汽均保持在峰值,最高温度达249℃,系统整体温升达139℃,而松散-密集型生成的蒸汽仅有1/3保持在峰值。密集-松散型出口处与水-气液面产生蒸汽的质量比值大,表明该床层的颗粒分布更有利于蒸汽的快速通过。
[Abstract]:The direct contact method is used to improve the heat and mass transfer rate in the adsorption heat converter, and the hot water is recovered to generate superheated steam directly. The steam generation process is modeled numerically, coupling mass, energy and momentum equations. The gas-liquid-solid three-phase calculation is reasonably simplified to two two-phase regions connected by a moving water-gas interface. The influence of zeolite particle distribution in packed bed such as loose-intensive and dense-loose on steam generation was studied by simulation. The two packed beds produce the same total mass of steam. Dense-loose type of steam formation time is short, but the rate of formation is fast. The ratio of the time between dense and loose steam generation and water entry is 58.8, the maximum temperature of the steam is 249 鈩，

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