RU2547505C1 - Method of producing oil coke - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: method includes axial delivery of a raw material to a coke chamber at a temperature of 475-485°C, coking during 14-36 hours, unloading of the produced coke by means the coke cutting in the upper part of the coke chamber by a hydrocutter in a drilling mode, drilling of the central borehole and further coke cutting in the lower part of the coke chamber by the hydrocutter in a cutting mode. Coke from the upper part of the chamber with the volatile-matter content above 15% is stored with the coke received from drilling of the central borehole and separately from the coke received from the lower part of the chamber with the volatile-matter content less than 12%.

EFFECT: invention allows excluding crumping of the central borehole and mixing of cokes with the different volatile-matter content, improving the quality of received coke as the target product.

Description

The invention relates to the field of oil refining, in particular to a method for the simultaneous production of petroleum coke with a low content of volatile substances (≤12.0%), used after calcination for the production of anodes or graphitized products, as well as coke with a high content of volatile substances (≥15%) used as a substitute for sintering and exhaust components in the charge of coking coal in the production of blast furnace coke.

A known method of producing petroleum coke by delayed coking of oil residues, including the supply of raw materials to the coke chamber at a temperature of 475-485 ° C, coking for 14-36 hours, steaming the obtained coke, cooling and unloading [Z.I. Sunyaev. "Slow coking of oil residues" - M., "Chemistry", 1967, S. 112-114]. The resulting coke is unloaded by any known method, for example, by drilling a central well in a coke array and then cutting it from top to bottom until the chamber is completely released. All unloaded coke is removed from under the chamber and stored. [N.T. Pokhodenko, B.I. Bronds et al. "Methods for the hydraulic discharge of coke from the chambers of delayed coking plants." - On Sat Proceedings of BashNII NP, issue 13. "Problems of the development of electrode coke production", Ufa, 1975, pp. 295-303].

The disadvantage of this method is that coke with a volatile substance content of 15% and above, formed in the upper part of the coke chamber, and coke formed in the lower part of the coke chamber with a volatile substance of 12% and lower, is stored without separation, which worsens quality target products used in various industries.

Closest to the claimed object is a method for producing petroleum coke, comprising feeding raw materials to a coke chamber at a temperature of 475-485 ° C, coking for 14-36 hours, unloading the obtained coke first by drilling a central well in a coke array, then cutting coke from the top parts of the chamber until it is completely liberated from coke to a depth of 4-5 m and subsequent cutting of coke from top to bottom until the chamber is completely liberated, while coke unloaded from the upper part of the chamber with a volatile content below 12% and coke unloaded from bo ttom of the chamber with a content of volatile matter greater than 15%, warehoused separately. [Pat. RF №2296151, IPC C10B 55/00, publ. March 27, 2007].

The disadvantage of this method is that when cutting “loose” coke in the upper part of the chamber, which has low mechanical strength, there is a volley descent into the central well, which leads to its blockage. To eliminate the blockage, there is a need for a hydraulic cutter to pass from top to bottom over the entire height of the coke chamber, which leads to the destruction of coke from the lower part of the chamber with a low content of volatile substances and its mixing with coke from the upper part of the chamber with a high content of volatile substances.

The invention is aimed at improving the quality of coke with a high content of volatile substances and coke with a low content of volatiles when they are separately unloaded from the coke oven chamber.

This is achieved by the fact that in the method of producing petroleum coke, including the axial feed of raw materials into the coke chamber at a temperature of 475-485 ° C, coking for 14-36 hours, unloading the obtained coke by drilling a central well in a coke array, cutting the coke of the upper part of the coke chamber until it is completely liberated from coke to a depth of 4-5 m and subsequent cutting of coke in the lower part of the chamber until it is completely liberated with separate storage of coke unloaded from the upper and lower parts of the coke chamber, according to the invention, first coke is cut in the upper part of the coke chamber with a hydraulic cutter in drilling mode, then a central well is drilled, and then coke is cut in the lower part of the chamber with a hydraulic cutter in cutting mode, while coke from the upper part of the chamber is stored together with coke from drilling the central well.

The indicated sequence of unloading operations allows avoiding blockages of the central well and reducing the likelihood of mixing coke from the upper part of the chamber with a volatile content of more than 15% with coke from the lower part of the chamber with a volatile content of below 12%.

The storage of coke from the upper part of the coke chamber from the central well is significant, since the volatiles content in the coke from the central well (along the chamber axis) is the same as in the upper part due to the axial input of raw materials.

The proposed method is as follows.

The feedstock, for example, tar mixed with risel, is heated in a furnace coil to a temperature of 495-500 ° C and fed axially into a coke oven with a temperature of 475-485 ° C. The raw materials are continuously supplied under such conditions to the coke oven for 14-36 hours. With the axial introduction of raw materials into the coke oven chamber, the main channel is formed along the axis of the latter and the coke in it has low mechanical strength and, therefore, a high content of volatile substances. Upon reaching the level of coke in the coke oven chamber 19-24 m, as judged by the testimony of radioactive level gauges, the coke oven chamber is disconnected from the flow of raw materials, sending it to a parallel installed, pre-prepared and heated chamber. The filled coke oven chamber is first steamed with water vapor, then cooled with water, the upper and lower covers of the coke oven chambers are opened and the process of hydraulic discharge of coke is started. First, in the coke massif, high-pressure water jets at an angle of 15-45 ° to the vertical axis (hydraulic cutter in drilling mode) cut the coke in the upper part of the chamber to a depth of 4-5 m, then drill a central well in the coke massif (with a diameter of 0.5-1 , 0 m) along the entire height of the coke oven chamber and remove the unloaded coke with a volatile matter content above 15% from under the chamber in a separate place. Then horizontally directed high-pressure jets (hydraulic cutter in cutting mode) conduct coke cutting of the remaining (lower) part of the chamber from top to bottom until it is completely released. Coke from this part of the chamber with a volatile matter content below 12% is stored separately.

The proposed method in comparison with the prototype allows to exclude the mixing of cokes with different contents of volatile substances and to improve the quality of the obtained cokes as target products used in various industries.

Claims (1)

A method of producing petroleum coke, including the axial feed of raw materials into the coke chamber at a temperature of 475-485 ° C, coking for 14-36 hours, discharging the obtained coke by drilling a central well in a coke array, cutting the coke of the upper part of the chamber until it is completely free of coke to a depth of 4-5 m and subsequent cutting of coke in the lower part of the chamber until the chamber is completely released with separate storage of coke unloaded from the upper and lower parts of the chamber, characterized in that coke is first cut from the upper part of the coke oven of the chamber with a hydraulic cutter in drilling mode, then the central well is drilled, after which coke is cut by the hydraulic cutter in the cutting mode in the lower part of the chamber, while coke from the upper part of the chamber is stored together with coke from drilling the central well.