预处理对鲁霍褐煤的成浆及气化特性的影响

Effect of pretreatment on its slurryability and gasification reactivity of Luhuo lignite

针对褐煤原煤成浆特性较差,难以直接应用于水煤浆气化的问题,通过对水洗或酸洗后的鲁霍褐煤煤样进行热处理以达到改善其成浆特性的目的,并利用BET、工业分析、元素分析对预处理前后的褐煤性质进行表征。用预处理后的褐煤湿磨制浆,考查其成浆性,结果表明:预处理使得煤样的孔隙结构遭到破坏,比表面积减小,平均孔径增大,其成浆浓度和流动性均得以改善,酸洗后进行热处理的鲁霍褐煤成浆浓度可达到60%。用TherMax500热重分析仪对预处理后的鲁霍褐煤进行常压气化热重分析,研究了不同预处理方法对气化的影响,结果表明:水洗后热处理对煤样的气化反应活性影响不大,而酸洗后热处理会大大降低煤样的气化反应活性。

The slurry ability of lignite is too poor to be applied directly to coal-water slurry gasification technology. Lu- huo lignite sample was pretreated differently by acid/water washing and pyrolysis in order to improve its slurryability. The treated samples were characterized by BET test, proximate analysis, ultimate analysis experiments, etc. The results show that the pore structure of the coal samples is destroyed by pretreatment, specific surface area decreases and aver- age pore size increases, and the slurry concentration and mobility are improved. The concentration of coal water slurry can rise to 60% in the study of the slunyability of pretreated lignite washed with acid. The TherMax500 thermogravim- etric apparatus was introduced to study the gasification characteristics of differently pretreated lignite. The results re- veal that pretreatment with water washed has little effect on coal gasification reactivity, but acid washing pretreatmenl greatly reduces gasification reactivity of luhuo lignite.