A method for preparing needle coke raw material

Abstract

The invention discloses a method for preparing a raw material for needle-like coke. The method comprises the steps of injecting a raw-material mixture heated by a radiation section of a heating furnace into coking towers for a delayed coking reaction, and carrying out fractionating on oil gas generated from the delayed coking reaction, so as to obtain a wax oil component. The method is characterized in that the raw-material mixture contains catalytic cracking oil slurry and delayed coking stock and are injected into the coking towers from upper parts and bottoms simultaneously, during the delayed coking reaction, cooling oil and / or cooling water are injected into the tops of the coking towers through pipelines, the pipelines for injecting the cooling oil and / or cooling water extend into the coking towers, and the sulfur content of the catalytic cracking oil slurry is lower than 0.7wt%. By the method, the catalytic cracking oil slurry can be effectively utilized, coke formation in a process is reduced, and thus, the yield of the raw material for the needle-like coke is increased.

Description

technical field [0001] The invention relates to a method for preparing needle coke raw materials. Background technique [0002] Needle coke is the main raw material for producing high-power and ultra-high-power graphite electrodes. The price of high-quality needle coke is relatively high. It can be used as ultra-high-power graphite electrodes for electric furnace steelmaking, supercapacitors for electric vehicles, and lithium-ion electrodes for communication batteries. is widely used. The most critical influencing factor in the production of needle coke is the property of the raw material, the better the property of the raw material, the higher the grade of the needle coke product. It is generally required that the content of aromatics in the raw materials for the production of needle coke should reach 30%-50%, the content of colloids and asphaltenes should be less than 1%, the content of ash should be less than 100ug / g, and the content of sulfur should be less than 0.5%. ...

AI Technical Summary

Problems solved by technology

In this method, since the oil slurry does not pass through the radiant section of the heating furnace, the temperature is relatively low and all the oil slurry is fed from the middle and upper parts, and the residence time is short, which makes some colloids and asphaltenes unable to fully react and will be carried by oil and gas to the coking wax. On the other hand, if the sulfur content in the raw oil slurry is high, the sulfur content in the coker wax oil is difficult to meet the requirements, so the application of this method is quite limited

In addition, the main reactor of delayed coking is the coke tower, in which the raw materials are converted into oil gas and coke. In the traditional delayed coking process, a large amount of aromatic components are converted into coke before leaving the coke tower, which will reduce the output of needle coke raw materials

Images