低阶煤直接液化油品中酚—芳烃—烷烃的分离研究
发布时间：2018-10-16 15:33
【摘要】：煤炭直接液化技术是煤转化获取燃料和化学品的有效途径之一,该技术面临两种选择——以产品为导向的石油替代燃料和以原料为导向的煤基化学品及燃料。前者需加氢精制提高液化产物氢碳比、加氢裂解开环,增加烷烃比例以提高辛烷值/十六烷值,同时降低杂原子含量,能耗和氢耗大,产品价格容易受石油价格冲击;后者需经多步分离/精制,提高产品的纯度和产率,虽然产品的价值很高,但同样需要大量的能耗和物耗。因此,建立并比较煤直接液化系统两种不同选择下的工艺单元对煤直接液化技术的选择有重要的参考价值。本文以煤炭科学研究总院日本NEDOL模式0.1 t/d煤直接液化连续试验数据为基础,首先从物料衡算及能量衡算角度分析建立煤直接液化流程模拟的可行性,其次以Aspen Plus为平台分别对以胜利褐煤和神华煤为原料的煤直接液化工艺中的煤干燥单元、加氢液化反应单元以及反应产物气固液分离单元进行模拟计算,在流程建立的过程中,分别用模型化合物及虚拟组分表示液化油,并以液化油为中心物质,对流程中的物性参数进行补充以完善流程的模拟,同时以三甘醇萃取精馏提酚、环丁砜液液萃取芳香烃,对液化油180-200℃馏分段进行酚-芳烃-烷烃族组分分离研究,得到的主要结果和结论如下:1.温和工艺与传统工艺相比,由于温度、压力均下降,导致煤转化率降低,蒸馏油中重质组分增加,虽然在液化单元能耗降低,但分离过程中重质油分离难度增加,从而导致分离单元能耗增加。2.神华煤直接液化油品以虚拟组分为模型,以高低温及减压蒸馏进行分离,在能耗分布上,分离可充分利用液化产物对于温度压力表现的不同,从而利用前期投入的能量,避免冷态分离下的能耗损失。3.神华煤加氢液化反应热效应与文献值接近,而胜利煤加氢液化热效应放热较大,这与胜利褐煤的煤阶低,反应活性高有关。4.以模型化合物代替液化油,所选模型化合物保留煤液化油的基本共沸,可以用于液化油分离的模拟,热力学模型选择UNIF-LBY。5.三甘醇-环丁砜组合溶剂可以实现煤液化油窄馏分中酚-芳烃-烷烃的分离,溶剂易于分离回收,以180-200℃窄馏分液化油模拟,酚的提取率达99.23 wt%,纯度为95.75 wt%,得到含芳烃18.85 wt%的航空燃料,以及纯度为79.94 wt%的芳烃,并且两种溶剂的回收率均在98%以上。
[Abstract]:Direct coal liquefaction technology is one of the effective ways for coal conversion to obtain fuel and chemicals. This technology faces two kinds of choices: product-oriented petroleum alternative fuel and feedstock oriented coal-based chemicals and fuels. The former needs to improve hydrogen-carbon ratio of liquefaction product, open ring by hydrocracking, increase alkane ratio to increase octane number / cetane number, decrease hetero-atom content, energy consumption and hydrogen consumption are large, product price is vulnerable to oil price shock. The latter needs to be separated / refined by many steps to improve the purity and yield of the product. Although the value of the product is very high, it also needs a lot of energy consumption and material consumption. Therefore, the establishment and comparison of the process units under two different choices of direct coal liquefaction system has important reference value for the selection of direct coal liquefaction technology. Based on the continuous test data of direct coal liquefaction of NEDOL model 0.1 t / d in Japan, this paper first analyzes the feasibility of establishing direct liquefaction flow simulation of coal from the angles of material balance and energy balance. Secondly, the coal drying unit, hydrogenation liquefaction reaction unit and gas-solid-liquid separation unit of reaction products are simulated and calculated by using Aspen Plus as the platform, respectively, in the process of establishing the process, using Shengli lignite and Shenhua coal as raw materials, respectively, in the process of direct coal liquefaction, the hydroliquefaction reaction unit and the gas-solid-liquid separation unit of reaction products are simulated and calculated. The model compound and virtual component were used to represent the liquefied oil, and the liquefaction oil was taken as the central substance to supplement the physical parameters of the process to improve the simulation of the process. Meanwhile, triethylene glycol was used to extract distilled phenol and sulfolane solution to extract aromatics. The separation of phenol-aromatics and alkanes in the 180-200 鈩，
本文编号：2274810
[Abstract]:Direct coal liquefaction technology is one of the effective ways for coal conversion to obtain fuel and chemicals. This technology faces two kinds of choices: product-oriented petroleum alternative fuel and feedstock oriented coal-based chemicals and fuels. The former needs to improve hydrogen-carbon ratio of liquefaction product, open ring by hydrocracking, increase alkane ratio to increase octane number / cetane number, decrease hetero-atom content, energy consumption and hydrogen consumption are large, product price is vulnerable to oil price shock. The latter needs to be separated / refined by many steps to improve the purity and yield of the product. Although the value of the product is very high, it also needs a lot of energy consumption and material consumption. Therefore, the establishment and comparison of the process units under two different choices of direct coal liquefaction system has important reference value for the selection of direct coal liquefaction technology. Based on the continuous test data of direct coal liquefaction of NEDOL model 0.1 t / d in Japan, this paper first analyzes the feasibility of establishing direct liquefaction flow simulation of coal from the angles of material balance and energy balance. Secondly, the coal drying unit, hydrogenation liquefaction reaction unit and gas-solid-liquid separation unit of reaction products are simulated and calculated by using Aspen Plus as the platform, respectively, in the process of establishing the process, using Shengli lignite and Shenhua coal as raw materials, respectively, in the process of direct coal liquefaction, the hydroliquefaction reaction unit and the gas-solid-liquid separation unit of reaction products are simulated and calculated. The model compound and virtual component were used to represent the liquefied oil, and the liquefaction oil was taken as the central substance to supplement the physical parameters of the process to improve the simulation of the process. Meanwhile, triethylene glycol was used to extract distilled phenol and sulfolane solution to extract aromatics. The separation of phenol-aromatics and alkanes in the 180-200 鈩，
本文编号：2274810
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