Delayed coking system and method capable of producing coal-series and oil-series needle coke in time-sharing manner

Abstract

The invention belongs to the technical field of needle coke, and particularly relates to a delayed coking system and method capable of producing coal-series and oil-series needle coke in a time-sharing manner. According to the invention, the input end of a raw material heating furnace is separately connected with a coal-series raw material feeding branch pipe and an oil-series raw material feedingbranch pipe through raw material feeding pipelines, and a raw material output pipeline is connected with a coking tower A and a coking tower B through a four-way valve A; a cracking gas output branchpipe A of the coking tower A and a cracking gas output branch pipe B of the coking tower B are connected with a coal-series fractionating tower and an oil-series fractionating tower through a four-way valve B; a carrier gas output branch pipe A is connected with the coking tower A and the coking tower B through the four-way valve A; a carrier gas output branch pipe B is connected with the coal-series fractionating tower; and a carrier gas output branch pipe C is connected with the oil-series fractionating tower. A coal-series needle coke delayed coking system and an oil-series needle coke delayed coking system can be integrated in one set of device, so equipment investment is saved, and the occupied area of devices is reduced; and carrier gas outside the delayed coking system is adopted to preheat a new tower, so the operation fluctuation of the fractionating towers is reduced.

Description

technical field [0001] The invention relates to the technical field of needle coke, in particular to a delayed coking system and method capable of time-sharing production of coal-based and oil-based needle coke. Background technique [0002] Needle coke is usually prepared by liquid-phase carbonization technology. During the liquid-phase carbonization process, coke raw materials are gradually pyrolyzed and polycondensed to form small mesophase spheres, which are then fully grown, fused and oriented, and finally solidified into fibers. A carbon product with a carbon-like structure, that is, needle coke. According to the different types of raw materials for producing needle coke, needle coke can be divided into oil-based needle coke and coal-based needle coke. Whether it is oil-based needle coke or coal-based needle coke, the production process is mainly raw materials There are three parts: pretreatment, delayed coking and calcination. Delayed coking is one of the heavy oil ...

AI Technical Summary

Problems solved by technology

In the existing process, on the one hand, the delayed coking systems of coal-based and oil-based needle cokes are operated independently of each other, which requires high equipment investment, large floor space, and poor economic benefits; on the other hand, the preheating of new towers generally uses online The specific preheating process is to open the spherical ring valve at the top of the new tower, and the high-temperature oil and gas in the production tower flow from the top of the new tower to the bottom of the tower for heat exchange and liquefaction. This preheating method will cause the operation of the fractionation tower to fluctuate. And then cause periodic fluctuations in the device system

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