煤气化灰渣与黑水对石油焦成浆性及气化活性的影响研究
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摘要
本文采用细渣和黑水作为提高石油焦浆稳定性的原料,研究结果表明,细渣可以大大提高石油焦浆的稳定性,随着细渣含量的增多,水焦浆的稳定性增强,采用添加15%(wt)的细渣制备水焦浆,最终可制备浓度为71%(wt)的水焦浆,而且具备良好的流动性、流变特性和长达超过200h的稳定性。研究发现细渣中的矿物质属于强亲水物质,能够降低石油焦表面的接触角,提高石油焦表面的亲水性,使得石油焦颗粒与水分离受到阻力,细渣高达161m2/g的比表面积以及含有的微量的高分子物质聚丙烯酰胺,都能够有效缓解固液分离。黑水也能够有效提高石油焦浆的稳定性,提高屈服应力。石油焦添加黑水最高可制备出固体颗粒质量分数为73%(wt)的水焦浆,满足工业气化用浆要求。
利用热重分析系统研究了石油焦的气化动力学特性。石油焦由于孔隙结构不发达,石墨化严重,碱金属含量低,气化活性低。研究结果表明,黑水、粗渣和细渣都能不同程度的对石油焦气化起到催化作用,黑水的催化作用远远高于粗渣和细渣。碱金属的催化作用与离子种类、离子结合形式、分散状态有关。碱金属能够增强碳表面对CO2的吸附作用,在高温下对石油焦有扩孔和增大比表面积的作用。
Fine slag and black water used as stabilizers of petroleum coke slurry, the results of the study showed that fine slag could obviously improve the stability of the slurry and the stability time increased upon an increase of the dosage of fine slag dosage. When fine slag is 15%(wt) of the total solid, the maximum solids concentration of the slurry could get to 71 %(wt) with the superior apparent viscosity, fluidity and stability available for practical utilization. And when black water was 100%(wt) of total liquid, the solids concentration of the slurry could get to 73%(wt).
The co-gasification kinetics characteristic of petroleum coke slurry had been investigated by high-pressure thermogravimetric analysis system. Petroleum coke with lower gasification activity due to.the pore structure underdeveloped, graphitization serious and low alkali content. The results show that black water, coarse slag and fine slag could catalyze petroleum coke gasification. Black water catalysis far above coarse slag and fine slag. The catalysis of alkali metal is relevant with ion species, ionic union form and decentralized state. Alkali metal could enhance carbon surface of CO2 absorption functiong and enlarge the specific surface area of petroleum coke at high temperatures.
利用热重分析系统研究了石油焦的气化动力学特性。石油焦由于孔隙结构不发达,石墨化严重,碱金属含量低,气化活性低。研究结果表明,黑水、粗渣和细渣都能不同程度的对石油焦气化起到催化作用,黑水的催化作用远远高于粗渣和细渣。碱金属的催化作用与离子种类、离子结合形式、分散状态有关。碱金属能够增强碳表面对CO2的吸附作用,在高温下对石油焦有扩孔和增大比表面积的作用。
Fine slag and black water used as stabilizers of petroleum coke slurry, the results of the study showed that fine slag could obviously improve the stability of the slurry and the stability time increased upon an increase of the dosage of fine slag dosage. When fine slag is 15%(wt) of the total solid, the maximum solids concentration of the slurry could get to 71 %(wt) with the superior apparent viscosity, fluidity and stability available for practical utilization. And when black water was 100%(wt) of total liquid, the solids concentration of the slurry could get to 73%(wt).
The co-gasification kinetics characteristic of petroleum coke slurry had been investigated by high-pressure thermogravimetric analysis system. Petroleum coke with lower gasification activity due to.the pore structure underdeveloped, graphitization serious and low alkali content. The results show that black water, coarse slag and fine slag could catalyze petroleum coke gasification. Black water catalysis far above coarse slag and fine slag. The catalysis of alkali metal is relevant with ion species, ionic union form and decentralized state. Alkali metal could enhance carbon surface of CO2 absorption functiong and enlarge the specific surface area of petroleum coke at high temperatures.
引文
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