Process for calcining petroleum coke

Abstract

The invention discloses a process for calcining petroleum coke. The calcination of the petroleum coke is carried out in a tank type calcining furnace, and the tank body of the tank type calcining furnace is provided with a preheating zone and 6-8 calcining zones sequentially from top to bottom, wherein the calcining temperature of the first calcining zone at the uppermost part is controlled in the maximum calcining temperature interval allowed by the petroleum coke; the calcining temperature of the second calcining zone in the downstream position of the first calcining zone is kept in the maximum calcining temperature interval and is not higher than the calcining temperature of the first calcining zone; starting from the third calcining zone, the calcining temperature of each calcining zone gradually reduces relative to the calcining temperature of the adjacent calcining zone in the upstream position; and in the undermost calcining zone, the calcining temperature is reduced to the discharging temperature. In the invention, when the petroleum coke is calcined, the high temperature zone is positioned at the top end of the calcining furnace, thereby relieving the high temperature deformation phenomenon of the furnace body, being more favorable for overflow of combustible gas in the petroleum coke, reducing the corrosion of the combustible gas on wall bricks, and being favorable for prolonging the service life of the tank type furnace.

Description

technical field [0001] The invention relates to the technical field of coking, in particular to a petroleum coke calcination process. Background technique [0002] Petroleum coke is a petroleum product obtained by distilling crude oil to separate light and heavy oils. The appearance is black or dark gray hard solid with metallic luster. It is a granular, columnar or needle-shaped carbon body formed by tiny graphite crystals. The main purpose of petroleum coke is to produce carbon products, such as graphite electrodes and anode arcs, to provide steelmaking, non-ferrous metals, aluminum smelting, and to produce silicon carbide products, or as fuel. Petroleum coke produced from petroleum coke factories is also called green coke, which contains some combustible gases of uncarbonized hydrocarbons. Green coke can be used as fuel-grade petroleum coke. If it is used as a carbon product, it must be treated The coke is calcined at high temperature to remove the combustible gas contai...

AI Technical Summary

Problems solved by technology

Through theoretical analysis and experimental practice, it is obtained that: because the third and fourth calcination areas are high-temperature areas in the traditional process method, the temperature of the furnace body is the highest at this time, it is easy to deform, and it also bears the pressure of petroleum coke from the upper first and second layers, so it is easy to occur deformation fission phenomenon

At the same time, the trace elements (combustible gas) contained in petroleum coke are most likely to volatilize in the third and fourth calcination zones. At this time, due to the depth of petroleum coke, the upper material surface is too thick, resulting in the obstruction of combustible gas overflow. , as a result, not only cannot the combustible gas completely overflow and participate in the combustion to provide heat, but also because the organic matter in the combustible gas is not discharged in time, it will also burn together with petroleum coke, resulting in gas expansion, and sticking into blocks, or sticking On the furnace wall, the furnace is blocked; and the gas moves down with the raw materials and forms an explosion due to contact with air during the discharge process, which poses a threat to equipment and personal safety, and directly affects the service life of the tank furnace.

Images