全温度段裂解提质对锡盟褐煤成浆特性的影响

通过对锡盟褐煤进行涵盖高、中、低完整温度段的裂解提质，研究了裂解过程对煤质特性、成浆浓度、浆体流变特性以及稳定性的影响。对锡盟褐煤在隔绝空气条件下裂解，测量不同浓度浆体的黏度，并对剪切速率和表观黏度进行拟合得到不同浆体不同浓度的流变特性曲线，根据国标规定方法测量浆体的实际浓度以及浆体稳定性。并从裂解过程中样品表面官能团和孔隙结构变化角度分析裂解对锡盟原煤及半焦成浆特性的作用机理。实验结果表明，裂解过程可以减少样品中的含氧官能团，降低其亲水性，有利于成浆浓度的提高，成浆浓度随裂解温度的升高呈现先增大后减小的变化趋势，但是裂解对浆体的稳定性有负面影响。随裂解温度的提高，含氧官能团的分解导致半焦的孔隙结构发生显著变化，平均孔径先减小后增大，比表面积和孔容积呈先增大后减小趋势。

Influence of pyrolysis temperature on slurry characteristics of Ximeng lignite char

Ximeng lignite was pyrolyzed at different temperatures and different characteristics including coal property, slurry ability, rheological behavior and stability of coal water slurry made from char were investigated. Pyrolysis was conducted in absence of air. Viscosities of different density slurries were measured and the curves of rheological behavior were fit through shearing rate and apparent viscosity. Actual slurry density and stability was measured according to national standard method. The mechanism of pyrolysis for raw coal and char slurry was analyzed through the alteration of surface functional groups and pore structure. The results show that pyrolysis could reduce oxygen-containing functional groups in samples and bring down their hydrophilicity, which is benefit to the improvement of slurry density. Water slurry density shows first an increase, and then decrease with the rise of temperature. Pyrolysis seems to be unfavorable to the stability of slurry. Pore structure is changed a lot through pyrolysis due to the decomposition of oxygen-containing groups. Specific surface area and pore volume first increase, and then decrease, but average pore diameter shows a totally opposite trend.