Coal and oil coprocessing method and device

Abstract

The invention relates to a coal and oil coprocessing method and device. The coprocessing method comprises steps as follows: step one, oil slurry pretreatment: heavy oil, a non-hydrogenated cycling solvent and a first catalyst are mixed, oil slurry is prepared and subjected to first hydrocracking reaction, a first product is obtained and separated, and first light distillate oil and first heavy distillate oil are obtained; step two, coal and oil coprocessing, solvent oil circulation and finished product separation. The coprocessing device comprises an oil slurry pretreatment device, a coal and oil coprocessing device body, a solvent oil circulating device and an oil product quality improving device. According to the coal and oil coprocessing method and device, selectivity for the heavy oil during coal and oil coprocessing is reduced, the percentage amount of pulverized coal in a coal and oil coprocessing process is increased, and the coal and oil coprocessing method and device are more suitable for practical application.

Description

technical field [0001] The present invention relates to a co-processing method of coal and heavy oil, specifically, the present invention combines the direct liquefaction process of coal with the hydrocracking process of heavy oil, so as to realize the production of coal and heavy oil in the same set of equipment Clean 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 China , the United States, Germany, Japan, etc. have developed their own direct coal liquefaction technology. However, the dir...

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Problems solved by technology

[0004] Although the above-mentioned kerosene co-refining technology realizes the co-processing of coal and heavy oil, the properties of heavy oil have a great influence on the co-processing results of kerosene: First, the properties of heavy oil directly affect the properties of the oil-coal slurry

In the direct liquefaction of coal alone, the viscosity of the oil-coal slurry is generally required to be 50-500mPa.s (80°C), while the viscosity of the residual oil itself is already very high (refer to the typical data in Table 1). When preparing oil-coal slurry, on the one hand, the proportion of coal powder in the oil-coal slurry will be greatly reduced. Usually, the content of coal powder in the oil-coal slurry can only be controlled at 30%-40%, thereby reducing the coal liquefaction equipment. The ability to process coal reduces the utilization rate of equipment; on the other hand, it will greatly increase the viscosity of oil-coal slurry. This high-viscosity oil-coal slurry is not conducive to pump transportation, and the heat and mass transfer effects are poor.

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

In the prior art, the viscosity of heavy oil is mainly reduced by thermal cracking, but the thermal cracking temperature is relatively high, generally at 450-480°C, heavy oil is prone to coking, which reduces the overall oil yield, and does not involve How to Improve the Hydrogen Supply Capacity of Heavy Oil

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