褐煤密相输运床气化过程流动反应特性及放大规律

项目名称： 褐煤密相输运床气化过程流动反应特性及放大规律

项目编号： No.51476058

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 能源与动力工程

项目作者： 常剑

作者单位： 华北电力大学

项目金额： 80万元

中文摘要： 密相输运床是适合褐煤的气化型式，且在单组分颗粒体系气固流动特性方面己取得较大进展，但气化炉内多组分颗粒的流动混合特性、反应耦合特性和放大规律等关键科学问题有待进一步深入研究。本项目针对褐煤密相输运床气化这种新型物质转化过程，采用理论分析、实验研究和数值模拟相结合的方法，从多相流角度认识高通量、高密度循环流化床内多组分颗粒体系的流动和混合特性；从气化反应角度探索褐煤、褐煤焦等的热化学转化特性和热解/气化耦合规律；进而建立无因次放大参数和放大准则，并结合小试和中试实验研究结果，确定褐煤密相输运床气化过程的放大规律。通过本项目的研究，不仅可以掌握复杂多相流动体系的流动与混合特性，提升目前对褐煤热解/气化化学机理和反应耦合规律的认识水平，而且能够揭示多相传递反应耦合体系的放大规律，从而为新型输运床褐煤气化技术的开发提供基础数据和理论支撑。

中文关键词： 褐煤；密相输运床；气化；流动特性；反应机理

英文摘要： Dense transport-bed gasifier is a novel gasification technology that is suitable for lignite. The flow behavior of the gas and solid phases inside the gasifier with single particle class have been investigated systematically in the past twenty years. However, some key scientific problems, such as the flow/mixing behavior, the reaction coupling mechanism and the scale-up rule, needs to be further explored in the gasifier with multi-particle classes. This program aims at investigating these key scientific item by using theory analysis, experiment investigation and CFD method. The flow and mixing behavior are first explored in a dense transport bed at the operating conditions of high flux and high density. Then, the pyrolysis and the gasification process of lignite(char) as well as their coupling mechanism are experimentally investigated. Further, the dimensionless scale-up number and the scale-up rule are established, and validated by the laboratory experiment and the pilot scale test. The scale-up of dense transport-bed gasifier is subsequently obtained. The implementation of this program could reveal the flow/mixing behavior in the complex multi-phase flow system, push our understanding on the gasification mechanism of lignite(char) and obtained the scale-up principle of the dense transport-bed gasifier. These results provide necessary design information and theoretical foundation for the development and the scale-up of the novel transport-bed coal gasification process.

英文关键词： Lignite;Dense transport bed;Gasification;Flow behavior;Reaction mechanism