A reaction feed temperature control device in coal tar hydrogenation

Abstract

The invention discloses a device for controlling the feeding temperature of reaction in hydrogenation of coal tar. The device comprises a tar tank, an atmospheric tower, a heating furnace and a reactor; hydrogen mixed oil in the heating furnace is heated to the temperature of 335 DEG C and then enters the reactor for reaction; a circulating pump P9621 at the bottom of the reactor circulates oil inthe reactor; an outlet pipeline which directly extends to an outlet of the heating furnace is added at a discharging end of a reaction feeding pump; a pipeline is added on a tower returning circulating line of a heat exchanger E9627 and directly enters an inlet of a heavy-oil pump; and raw materials directly enter a reaction system by the heavy-oil pump. According to the device for controlling feeding temperature of reaction in hydrogenation of coal tar, the outlet pipeline which directly extends to the outlet of the heating furnace is added at the discharging end of the reaction feeding pump, the pipeline is added on the tower returning circulating line of the heat exchanger E9627 and directly enters an inlet of the heavy-oil pump, the raw materials directly enter the reaction system bythe heavy-oil pump, the inlet of the reactor can be cooled by the cold raw materials so as to control the feeding temperature of the reactor, and thus, the inlet of the reactor is cooled favorably.

Description

technical field [0001] The invention relates to a feed temperature control device, in particular to a reaction feed temperature control device in coal tar hydrogenation, belonging to the technical field of coal tar hydrogenation. Background technique [0002] Coal tar is a black or brown viscous liquid, also known as coal tar. The odor is similar to naphthalene or aromatic hydrocarbons. It is a by-product of dry distillation of coal to produce coke and gas. The composition is complex, mainly a mixture of phenols, aromatic hydrocarbons and heterocyclic compounds. It is carcinogenic and belongs to the first category of carcinogens in IARC. It is mainly used for fractional distillation of various phenols, aromatic hydrocarbons, alkanes, etc., and can be used for the manufacture of other dyes or medicines, etc. At present, the industries involved in coal tar also include direct combustion as fuel. [0003] In recent years, although domestic coal tar production capacity has c...

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Problems solved by technology

[0006] The present invention proposes a reaction feed temperature control device for coal tar hydrogenation, which solves the problem that the reaction feed temperature of the coal tar hydrogenation device in the prior art can only be controlled by the outlet of the heating furnace, once the reactor bed temperature rises too fast , and then use the heating furnace to control the inlet temperature of the reactor, the cooling is not very ideal, which is not conducive to the processing of coal tar, and will damage the reactor in severe cases

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