Method for producing clean diesel oil through coal tar hydrogenation, and system for method

Abstract

The present invention relates to the field of coal tar processing, and discloses a method for producing clean diesel oil through coal tar hydrogenation, and a system for the method. The method comprises: introducing a coal tar raw material into a pretreatment unit; introducing the obtained material into a slurry bed hydrogenation reactor; sequentially carrying out separation and fractionation on the obtained material to obtain a light distillate, a middle distillate and a heavy distillate; throwing out part of the heavy distillate; introducing an anthracene oil raw material, the middle distillate and the light distillate into a refining reactor; recycling the remaining heavy distillate back to the slurry bed hydrogenation reactor; sequentially carrying out separation and fractionation on the effluent from the refining reactor; recycling part of a first diesel oil distillate back to the slurry bed hydrogenation reactor; and introducing the remaining first diesel oil distillate into a hydrogenation modification reactor. With the method of the invention, the yield of the liquid can be maximized, the utilization ratio and the utilization value of coal tar resources are improved, and the operation cycle of the equipment is prolonged.

Description

technical field [0001] The invention relates to the field of coal tar processing, in particular to a method for producing clean diesel oil through hydrogenation of coal tar and a system for producing clean diesel oil through hydrogenation of coal tar. Background technique [0002] With the sustained and rapid development of social economy, my country's demand for petroleum products is also increasing. [0003] However, petroleum is a non-renewable energy source and is facing a crisis of depletion. In contrast, China has relatively abundant coal reserves, so producing liquid fuel from coal has become a basic direction of coal processing and utilization. [0004] With the rapid development of the domestic coal chemical industry, especially the modern coal chemical industry, the output of coal tar is increasing, and the clean processing and effective utilization of coal tar are becoming more and more important. At present, the conventional coal processing method is to cut var...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the defects in the existing method of processing coal tar that are easy to coke to generate coke or deposit down to block the internal components of the reactor, resulting in the slurry bed hydrogenation unit not being able to run stably for a long period of time, and to provide a Novel method for hydrogenation of coal tar to produce clean diesel and system for the method

The inventors conducted in-depth research and found that the colloids and asphaltenes with smaller molecular weight and fewer aromatic rings will be more unstable and more likely to coke to form coke or deposit down to block the internal components of the reactor, which has become the current coal tar slurry One of the main reasons why the state-bed hydrogenation unit cannot operate stably for a long period of time

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