【作者】 王娜；

【导师】 朱书全；

【作者基本信息】 中国矿业大学（北京） ， 矿物加工工程， 2010， 博士

【摘要】 本文阐述了低阶煤热加工提质的重要性,探讨了低阶煤无粘结剂热压成型机理,研究了低阶原煤和型煤的热解规律。结果表明在相同热解条件下,型煤的半焦产率和质量均高于褐煤热解；焦油析出量和煤气热值与褐煤热解相近,但废水量大幅降低；型煤热解煤气量在温度大于550℃时明显高于褐煤。采用Matlab仿真确定了低阶型煤热解煤气量在升温阶段与热解温度呈3-5阶幂函数关系；在保温阶段与时间呈反正切函数关系。采用Coats-Redfern法计算了低阶型煤热解动力学参数,分析了低阶型煤热解机理。得到了型半焦挥发分、机械强度、气化反应性、发热量等性能指标随热解条件的变化规律,确定了型半焦生产的最佳热解温度为750℃。通过在50kg级间歇立式炉上进行的型煤与相似粒度原煤热解实验表明,在相同热解温度下,型煤的热解反应较快,粉焦率大幅降低。更多还原

【Abstract】 The significance of low-rank coal thermal upgrading was explained in this paper. The binderless briquetting mechanism of low-rank coal was illustrated and the pyrolysis rules of low-rank coal and briquette were studied comparatively. The results indicated that the semicoke yield from the briquette was larger than that from the raw coal, and semicoke characteristics of the former were better than the latter. Tar yield and gas calorific value of briquette pyrolysis were equivalent to that of raw lignite pyrolysis, however, waste water output reduced dramatically. More amount of gas were obtained from briquette pyrolysis especially during heating stage above 550℃. Matlab simulation method was used to establish relational expressions of gases volume and pyrolysis conditions. It was found that pyrolysis gas volume and temperature present a power function relation in heating stage, while an arctangent function relation exists in holding period. The pyrolysis kinetics parameters of low-rank coal and briquette were calculated through Costs-Redfern method, and the pyrolysis mechanism of briquette was discussed. Bri-semicoke indexes such as volatile, strength, gasification reactivity, calorific value were comprehensively measured along with the changes of pyrolysis condition, and the results showed that the optimum pyrolysis temperature of briquette was 750℃.50kg-scale briquette and similar size block raw coal pyrolysis were carried out in a vertical batch furnace. The comparison result showed that briquette pyrolysis rate was faster than raw lignite at the same pyrolysis temperature, and, the yield of semicoke breeze was reduced obviously.更多还原