粉煤成型机理研究进展

阐述了无黏结剂成型机理和粉煤有黏结剂冷压成型机理,说明无黏结剂成型机理主要包括沥青质假说、腐植酸假说、毛细管假说、胶体假说以及分子黏合假说;粉煤有黏结剂冷压成型时,黏结剂与粉煤的作用力主要有固体桥联联结力、静电吸引力、液体桥联联结力;两种机理均无法全面解释型煤成型机理和指导型煤生产实践。在此基础上,提出粉煤成型机理研究新方法,可从了解型煤微观结构入手,研究型煤硬度、弹性、塑性和表面物理化学性质等原煤自身性质以及粒度、水分、烘干温度和成型压力等工艺参数与不同黏结剂作用时型煤微观结构形态及变化规律,建立型煤制备过程/工艺-微观结构-宏观性质之间的关系来探寻粉煤成型机理。

Research progress on briquetting mechanism

Discuss the processes of non-binder briquetting mechanism and cold-press briquetting mechanism with binder.Bituminous hypothesis,humic acid hypothesis,capillary hypothesis,colloid hypothesis and adhesion molecules hypothesis are the main theories of non- binder briquetting mechanisms,but those hypotheses can not fully explain the briquetting issues about lignite.Discuss the main forms and common used binders of solid bridge connecting, electrostatic attraction and liquid bridge connecting from the view of interaction of binders and the pulverized coal.Those theories are explanations of briquetting performance and there is not a uniform instructive theory for briquette production yet.Finally propose a new approach for research of briquetting mechanism.Starting from the understanding of microstructure of briquette, investigate the hardness, elasticity, plasticity and physical and chemical properties of raw coal, analyze the structure and change law of briquette when particle, moisture, drying temperature and briquetting pressure change.The relationships of briquetting process-microstructures-macropraperties would be figured out to explore the briquetting mechanism from the micro-structural viewpoint.