Start-up method of direct coal liquefaction unit

Abstract

The invention provides a work starting method for a coal direct liquefaction device, which comprises the following steps of: a) performing gas seal on a coal slurry preparation system, a reaction system and a fractionating system comprising an atmospheric tower and a vacuum distillation tower, and performing an emergency depressurization test on the reaction system; b) introducing solid-containing dirty oil from a tank field so as to perform circulating oil delivery heating on the coal slurry preparation system, the reaction system and the fractionating system; c) recovering solvent oil of the tank field; and d) feeding coal into the systems. The work starting method for the coal direct liquefaction device has the advantages that: materials which are in a state between molding and non-molding at the bottom of the vacuum distillation tower in a coal feeding initial stage or materials at the bottom of the vacuum distillation tower in an emergency state are discharged to the tank field, and the dirty oil is processed and a solvent is recovered before the next coal feeding process, so that the solvent oil for work starting can be saved, and the dirty oil in the tank field is recovered; moreover, the forming time after the coal is fed can be shortened, the delivery of the dirty oil is reduced and the benefit is increased.

Description

technical field [0001] The invention relates to a method for starting a coal direct liquefaction device, in particular to a method for starting a coal liquefaction device of an industrial demonstration device. Background technique [0002] Coal direct liquefaction was industrialized in Germany during World War II by the Germans. At that time, the liquefaction reaction conditions were relatively harsh, with a reaction temperature of 470°C and a reaction pressure of 70MPa. After World War II, with the development of a large amount of cheap oil in the Middle East, direct coal liquefaction plants were closed due to loss of competitiveness. [0003] In the early 1970s, due to the worldwide oil crisis, coal liquefaction technology became active again. Industrially developed countries such as Japan, Germany, and the United States have successively researched and developed a number of new processes for direct coal liquefaction on the basis of the original ones. Most of the research...

AI Technical Summary

Problems solved by technology

Every time the machine is driven, it takes a certain amount of time from coal feeding to residue formation, and the reaction product during this period cannot be formed, so it is stored as waste coal slurry in the waste coal slurry tank in the tank area, and when the device fails to deal with it, it will generate The waste coal slurry in the waste coal slurry tank is also stored in the waste coal slurry tank. The waste coal slurry in the waste coal slurry tank is not only large and difficult to handle, but also affects the production cost and the operating flexibility of the direct coal liquefaction device. It is urgent to solve

Images