Method for co-processing coal high in inertinite content and heavy oil

Abstract

The invention relates to a method for co-processing coal high in inertinite content and heavy oil. The method includes the steps that heavy oil, a first hydrogenation-free recycling solvent and a catalyst are mixed to prepare oil slurry, hydrocracking is conducted to obtain a first product, and separation is conducted to obtain first light distillate oil and first heavy distillate oil; the first heavy distillate oil, a second hydrogenation-free recycling solvent and pulverized coal are mixed to prepare coal-oil slurry, hydrocracking is conducted to obtain a second product, and separation is conducted to obtain second light distillate oil and second heavy distillate oil; one part of the second heavy distillate oil is separated to obtain residue and third heavy distillate oil, wherein the third heavy distillate oil serves as the first hydrogenation-free recycling solvent for preparing the oil slurry; the other part of the second heavy distillate oil serves as the second hydrogenation-free recycling solvent for preparing the coal-oil slurry; hydrogenation upgrading is conducted on the first light distillate oil and the second light distillate oil to obtain a third product, and separation is conducted to obtain naphtha, aviation kerosene and diesel oil. The method improves the conversion rate of the coal high in inertinite content, and the yield of the liquid product is increased.

Description

technical field [0001] The invention relates to a method for co-processing coal with high inertinite content and heavy oil. Specifically, the present invention reduces its viscosity through pretreatment of heavy oil, improves its hydrogen supply, and then combines it with high inertinite content Co-processing of coal, so as to achieve the purpose of maximizing the production of clean oil products from coal with high inertinite content and heavy oil. Background technique [0002] In 2015, China's crude oil processing volume reached 522 million tons, and the net import volume was 334 million tons. The dependence on foreign crude oil was as high as 64%. . China has abundant low-metamorphic coal resources, these low-metamorphic coals have high reactivity, and coal can be converted into clean vehicle fuel through direct coal liquefaction technology, which is an important way to effectively alleviate the contradiction between my country's oil supply and demand. At present, except...

AI Technical Summary

Problems solved by technology

In the direct liquefaction of coal alone, the viscosity of oil-coal slurry is generally required to be 50-500mPa.s (80°C), and the viscosity of residual oil itself is high. It will greatly reduce the proportion of coal powder in the oil-coal slurry. Usually, the content of coal powder in the oil-coal slurry can only be controlled at 30%-40%, thus reducing the ability of the coal liquefaction device to process coal and reducing equipment utilization. rate; on the other hand, the viscosity of the oil-coal slurry will be greatly increased. This high-viscosity oil-coal slurry is not conducive to the transportation of the pump, and the heat and mass transfer effects are poor

Third, the hydrogen supply capacity of heavy oil will directly affect the liquefaction effect of coal

In the prior art, thermal cracking is mainly used for pretreatment to reduce the viscosity of heavy oil, but the thermal cracking temperature is relatively high, generally at 450-480°C, and heavy oil is prone to coking, which reduces the overall oil yield. And it does not involve how to improve the hydrogen supply capacity of heavy oil

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