Process method for preparing needle coke through kettle type charring

Abstract

The invention discloses a process method for preparing needle coke through kettle type charring. The method comprises the following steps: (1) at a first stage, conveying raw materials to a kettle type charring reactor, and heating to a temperature of 380-420 DEG C; (2) at a second stage, heating to a temperature of 430-480 DEG C from the end point temperature of the first stage, and controlling the reaction temperature according to a reaction system air exhaust amount of 10-30 h<-1>; (3) completing constant temperature maintaining when the exhausted air amount is 50-90% of the total air exhaust amount, wherein a third stage is a constant temperature stage; (4) at the fourth stage, heating to a temperature of 490-510 DEG C from the end point temperature of the third stage; and (5) at the fifth stage, heating to a charring temperature from the end point temperature of the fourth stage, and carrying out constant temperature maintaining for 1-5 h to complete the charring, wherein the generated needle coke is deposited on the bottom of the tower. With the temperature control method, it can be ensured that small spheres in the system can be subjected to complete growth and fusion at the right time to obtain the needle coke having a high fiber needle structure.

Description

technical field [0001] The invention relates to a process for preparing needle coke, in particular to a process for preparing needle coke by still coking. Background technique [0002] The world produces more than one billion tons of steel every year to meet the needs of social development. The increase in steel scrap resources, the application of direct reduced iron technology, the increase in demand for special steel, and the requirements for energy conservation and emission reduction all make the share of electric furnace steel production maintain a momentum of continuous growth. The operating conditions of electric arc furnaces are very harsh, and high-performance graphite electrodes are required to operate safely and reduce the manufacturing cost of electric furnace steel. Needle coke is not only used for ultra-high power graphite electrodes, but also used as raw materials for thermal structure graphite and special carbon products. American Great Lakes Company first i...

AI Technical Summary

Problems solved by technology

This method requires that the material be heated from room temperature to 480-550°C within 2-30 seconds, which is difficult to realize industrially. In addition, this rapid heating method is also likely to cause internal bumping and solidification of the system during the industrial scale-up process, which is not conducive to Creates smooth, soft coke conditions to produce porous coke

[0005] None of the above methods paid attention to the two key factors of the full growth of the mesophase and the subsequent tensile deformation at the same time, so needle coke with excellent performance and well-developed needle-like streamline texture could not be produced.

Images