【作者】 陈训刚；

【导师】 程军； 刘建忠；

【作者基本信息】 浙江大学 ， 工程热物理， 2008， 硕士

【摘要】 水煤浆是一种适合我国国情的节能、环保和代油燃料,它既可直接用于锅炉代油燃烧,又可进行气化用于煤化工多联产和IGCC发电,所以是保证我国能源长期稳定发展的战略和现实选择。在工业应用中,如何利用劣质煤制取高品位的水煤浆,如何改善水煤浆的成浆性和流动性,如何提高水煤浆的气化效率,是目前水煤浆研究的热点和难点问题,具有重要的研究意义和应用前景。首先利用氮吸附仪等实验方法分析了10个典型煤种的微观孔隙结构,采用非线性的分形理论描述了其孔隙分形特征,并探讨了水煤浆的颗粒分形维数与成浆特性的相关规律,发现随着分形维数增大,水煤浆粘度增大并且最大成浆浓度变小。其次创造性地提出利用微波和光波辐照改善劣质煤的成浆特性,并深入探讨了其反应机理。针对水分高、氧量高、成浆性差的菲律宾煤,利用微波和光波辐照改性使成浆性明显提高。通过不同的微波辐照改性时间10s、20s、30s、60s和120s,使菲律宾水煤浆的最大成浆浓度提高了0.4%、1.1%、2.42%、1.3%和0.1%;通过不同的光波辐照改性时间10s、30s、60s和120s,水煤浆的最大成浆浓度提高了1.0%、2.4%、1.35%和1.0%。利用XRD衍射仪、扫描电镜、氮吸附仪和红外光谱仪分析了菲律宾煤改性前后的微观形貌和成分组成变化,探讨了微光波辐照改善水煤浆成浆性的作用机理。最后研究了微波改性对水煤浆气化特性的影响规律,试验发现微波辐照改性后的水煤浆焦的气化反应起始温度明显降低,气化反应的完成时间减少,从而使气化特性明显改善。而微波辐照改性对不同煤种水煤浆的气化特性改善效果有所差别,这主要与各煤种所含水分和矿物质成分不同有关。更多还原

【Abstract】 As clean energy, coal water slurry can be used in combustion of replacing oil and gasification for coal chemical industry、IGCC. CWS technology suits national conditions. The research focus is that, how to make excellent slurry by the poor coal, how to improve the slurrying property, how to improve the efficiency of gasification.In this article firstly, the particle pore structure of ten different coals have been researched by N2 absorption apparatus. When discuss the rule of fractal dimension and slurrying property, find that the slurry’s apparent viscosity increase when the fractal dimension increase.The innovative idea is using microwave and lingtwave to improve the slurrying property and researching the mechanism. The Philippines coal with high moisture and high oxygen content, can improve the slurrying property after the microwave pretreatment. The cws’s viscosity reduce and the slurry’s concentration improve after the microwave and lightwave pretreatment of 10s、20s、30s、60s、120s. Researched the mechanism of microwave and lightwave pretreatment through SEM、XRD、N2 absorption apparatus and infrared spectrum.Then research the gasification property after microwave pretreatment. The microwave pretreatment has influence on the gasification efficiency of cws char, the beginning temperature minish and the reaction time reduce. The different coals have different result because of the moisture and mineral content.更多还原