Reaction kettle for direct coal liquefaction and application thereof

Abstract

The invention discloses a reaction kettle used for direct coal liquefaction and applications thereof. The reaction kettle comprises a reaction kettle body, an agitating shaft and an agitating blade arranged in the reaction kettle body and an air suction pipe which is arranged in the reaction kettle body and communicated with exterior; wherein the agitating blade is arranged at the free end of the agitating shaft, the agitating shaft is additionally provided with a self priming agitating blade which is arranged above the agitating blade; air suction holes communicated with the reaction kettle are arranged at the upper part of the agitating shaft; the self priming agitating blade is provided with air outlet holes communicated with the air suction holes at the self priming agitating blade. The invention further discloses a method for direct coal liquefaction in the reaction kettle; when the direct coal liquefaction is carried out in the reaction kettle of the invention, compared with the direct coal liquefaction by the ordinary reaction kettle, the coal conversion rate and yield of components soluble in normal hexane can be improved by 7% and sometimes by as high as 15%, as a result, conversion rate of coal is greatly improved.

Description

technical field [0001] The present invention relates to a reaction kettle for direct liquefaction of coal, and also relates to a method for direct coal liquefaction by using the reaction kettle, specifically, various coal types including low-quality lignite and high-quality bituminous coal can be directly The method of hydrogenation liquefaction. Background technique [0002] Coal is the cornerstone of my country's energy security. For a long time, people have generally used solid raw coal for boiler combustion, unlike oil and natural gas, which are processed and refined before use to produce oil and fuel gas suitable for various purposes, so as to increase their added value. value. The added value of coal utilization is very low, so my country's coal utilization efficiency is far behind Japan, the United States and other developed countries. At the same time, raw coal contains a large amount of impurity elements such as sulfur and nitrogen. When burning raw coal as fuel, a...

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Problems solved by technology

However, the traditional inner loop reactor cannot completely solve the problem of coke accumulation at the bottom of the suspended bed reactor during the hydrocracking process

In addition, the traditional inner loop reactor has the following disadvantages: (1) The high linear velocity of the liquid will inevitably cause back-mixing of the materials, so that part of the fresh raw materials entering the reactor will be discharged from the top outlet without complete reaction, and the coal The conversion rate of the powder is low; (2) The high liquid linear velocity causes the hydrogen gas to rise rapidly, the gas holdup of hydrogen in the liquid phase is low, and the hydrogenation effect is poor; (3) The high liquid linear velocity causes the material to rise under the same conditions. The residence time is shortened, and the conversion rate of pulverized coal is low; (4) the hydrogen in the liquid raw material between the outer wall of the circulation cylinder and the inner wall of the reactor is less, and the phenomenon of coking is serious; (5) the upper part of the traditional circulation reactor has gas-liquid separation (6) The upper part of the traditional loop reactor is a gas-liquid separation zone, and the effective volume of the reactor is only 70-80% of the reactor volume

But its disadvantage is that when the coal slurry enters the reactor many times, it is inevitable to use the external circulation pump

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