Low-temperature calcining process for pot furnace

Abstract

The invention relates to a low-temperature calcining process for petroleum coke, particularly a low-temperature calcining process for a pot furnace for producing anodes, cathodes and electrodes for aluminum in a carbon industry and petroleum coke in a special carbon industry. By controlling the flame path temperature and the discharge speed of the pot furnace, the calcining temperature range of petroleum coke in a material pot is ensured at 1150-1220 DEG C, the discharge speed which is 10-20% higher than a normal discharge speed reaches 110-120 kg / h, and the sulfur removal amount in the calcining process of petroleum coke is reduced, so that the true density of calcined coke is ranged from 2.05 g / cm3 to 2.07 g / cm3, and an over-calcined phenomenon that the calcined coke for producing prebaked anodes in the pot furnace is avoided. As a result of a relatively low calcining temperature and shorter standing time, the sulfur removal amount in the petroleum calcining process is reduced, and the content of sulfur dioxide in flue gas and the flue gas purifying pressure are reduced; as the furnace body temperature is reduced and the sulfur removed is reduced, corrosion of sulfur in the petroleum coke on silica bricks is alleviated, so that the service life of the furnace body is greatly prolonged under the condition that the pot furnace calcines high-sulfur coke; and acceleration of the discharge speed further improves the capacity of the pot furnace and improves the flue gas amount of a system, thereby favorably increasing the capacity of waste heat steam.

Description

technical field [0001] The invention relates to a low-temperature calcination process for petroleum coke, in particular to a low-temperature calcination process for producing aluminum anodes, cathodes, and electrodes in the carbon industry and a petroleum coke tank furnace for the special carbon industry. Background technique [0002] With the improvement of the quality requirements of prebaked anodes in large-scale electrolytic cells and the control of anode production costs, most enterprises use tank furnaces for petroleum coke calcination, and the advantages of tank furnaces in terms of calcined coke quality and yield are reflected This is more obvious, mainly due to the indirect heating of petroleum coke with high-temperature gas during the calcination process of the tank furnace, the calcination temperature is high, and the calcination time is long, the calcination temperature can reach 1250 ℃ ~ 1350 ℃, and the discharge speed is generally 100kg / h or so, the true densi...

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Problems solved by technology

[0004] 1) The sulfur in petroleum coke erodes the silica bricks of the tank furnace body during the high-temperature calcination process, resulting in a reduction in the service life of the silica bricks, which directly reduces the service life of the tank furnace. In the past, the service life of the tank furnace could It has reached more than 10 years, but after using high-sulfur coke, the service life is directly reduced to 3-4 years

[0005] 2) The sulfur precipitated during high-temperature calcination enters the flue gas to generate SO 2 , resulting in SO in the flue gas 2 The concentration rises sharply, and some even reach 4000~6000mg / Nm 3 , not only affects the service life of the smoke exhaust system equipment, but also greatly increases the difficulty and cost of desulfurization

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