SU1472480A1 - Method of producing needle-shape coke from a mixture of coal pitch with petroleum residues - Google Patents

Abstract

The invention relates to methods for producing needle coke from a mixture of coal tar and petroleum residues and allows for increasing the yield of needle coke. The coal tar is preheated to 500-510 ° C, fed to the upper part of the coking chamber, kept to produce steam-gas coking products, separated with the release of heavy gas oil, and heavy gas oil is mixed with oil residues in a ratio of (1-9): 1, heat the mixture to 480-490 ° C and maintain it until coke formation at 0.4-1.0 MPa. 2 hp ff, 7 tablets, 1 ill.

Description

The invention relates to a method for producing needle coke from a mixture of coal tar and petroleum residues and can be used in the refining industry in delayed coking plants.

The purpose of the invention is to increase the yield of needle coke.

The drawing shows a scheme for producing needle coke.

Chambers 1 to 4 of coking are interconnected in pairs and each is connected to a distillation column 5. Furnace 6 and 7 are connected to chambers 1 and 2, a furnace, 8 are connected to chambers 3 and 4 and together with a furnace 7 are connected to a distillation column 5.

Example 1. Coal tar is heated in a furnace to 500-510 ° C and fed to the top of one of the coking reactors (1 or

2). The pressure in the reactor is 0.15 MPa, the feed rate is 1.5 l / h. As a result of single evaporation, a large part of the coal tar goes into the vapor phase, separates from the liquid phase and is discharged through the upper part of the reactor to the distillation column 5. Liquid phase - .: The mennohal resin is lowered into the lower part of the reactor and due to the heat accumulated by the liquid phase, it is coked. In the lower part of reactors 1 and 2, to provide a balance amount of heat, coolant is supplied, heated to 500 -. As the coolant use light gas oil coking - (FR. 280 - 350 ° C).

Vaporous products of coking coal tar is served under the bottom plate of the distillation column 5. Vaporous products of coke LFA

3,147

neither contain hydrocarbon gases, gasoline, light gas oils and heavy gas oil fractions boiling above 350 ° C,

Low-sulfur tar is also fed there. As a result of contact of the vaporous products of coking coal-tar tar with low-sulfur tar, the heaviest part (heavy gas-oil fractions with a boiling point higher) of the vapor condenses and mixes with the low-sulfur tar, the condensed portion of the vapor through the bottom plate. the part of the column where it is divided into predetermined fractions and out of the unit.

Thus, a mixture containing heavy and gasoil fractions of coal tar and low-sulfur tar is formed in the lower part of the column.

The resulting mixture is fed to the furnace 8, heated to 480 - and sent to the bottom of one of the coking chambers (3 and 4), where it is coked under a pressure of 0.4-1.0 MPa. Coking time 4 hours. Feed rate of 1.5 g / l,

Table 1 shows the material balance of coking at various pressures and indicators of the quality of coke after calcination at 130 ° C ± 50 ° C for 5 hours,

As can be seen from this example, the method allows to obtain high-quality needle coke. Depending on the pressure of the coc coking process, the yield of curd coal tar to coal tar is 16.1 - 19.45%, Coking. at higher pressures, this leads to a slight increase in coke yield, but at the same time capital costs increase dramatically. Coking at low pressure significantly reduces the yield of coke,

EXAMPLE 2 A mixture containing 90% heavy gas oil coking and 10% low-sulfur tar is heated to and sent to the bottom of the coking reactor. The pressure in the coking reactor is 0.4, 0.7 and 1.0 MPa, the coking time is 4 hours, the feed rate is 1.5 l / h.

The material balance of coking at various pressures and the quality of calcined coke are given in Table 2.

0

five

0

five

Q

0

five

45

50

55

Example 3, carried out analogously to example 2, the ratio of components in the feedstock is as follows: coal oil tar coking gas oil 80%, low-sulfur tar 20%.

The material balance of coking and the quality of coke are presented in

table.3.

Example 4, Carried out analogously to Example 3. The ratio of the components in the raw materials is as follows: heavy coal tar gas oil is 60%, tar is 40%.

The material balance of coking and the quality of calcined coke are presented in table, 4,

EXAMPLE 5 Analogously to Example 3, the ratio of the components in the feedstock is as follows: heavy coking coal gas oil, tar, 50%, low-weight tar, 50%.

The material balance of coking and the quality of calcined coke are given in table 5,

Example 6: Analogously to Example 3, the ratio of components to raw materials: heavy gas oil for coking coal tar 40%, low-sulfur tar 60%,

The material balance of coking and the quality of calcined coke are given in table 6.

EXAMPLE 7: Carried out analogously to Example 3, the raw material is low-grade tar.

The material balance of coking and the quality of the calcined coke are given in Table 7.

As SPECIFIC of the examples given, coking a mixture of coal tar and petroleum residue makes it possible to increase the yield of needle coke by 5-12%.

Claims (1)

In this case, relatively low-value petroleum residues are involved in the raw material for the production of needle coke, which in its pure form can be used only in the production of low-sulfur electrode coke. Invention Formula 1, a method for producing needle coke from a mixture of coal tar and petroleum residues, including preheating the coal tar, displacing, heating the mixture to the coking temperature and quenching it to form coke, i.e. In order to increase the yield of needle coke, coal tar is preheated to 500-510 ° C, served in the upper part of the coking chamber, held to produce steam and gas coking products, separated with the release of heavy gas oil, mixed with heavy gas oil with oil residues in the ratio (l-9): l, the mixture is boiled down 4724806 are heated to 480-490 ° C and maintained at 0.4-1.0 MPa. 2, Method pop.1, which differs from the fact that the coolant is supplied to the lower part of the coking chamber of coal tar, 3, Method Pop.1, which differs from the fact that low-sulfur tar is used as oil residues. Table 1 ten gas oil coking of amenogenic resin,% by mass, wt.%: Gas Distil t. Coke Coke in terms of coal tar, wt.% Quality of calcined coke: Density, Kr / i-f Sulfur content, wt.% Ash, wt.% Oxidability, wt.% Anisometry Grain content with anisometry more than 1.5 relative units,% Average anisometry, relative units Evaluation of the structure, score Coefficient of thermal expansion along the axis of expansion, Material balance and characteristics of the products obtained  heavy gas oil coking coal tar, wt.% Low-sulfur tar, wt.% Received, wt.%:  Gas Distil t Coke Coke in terms of coal tar, wt.% 100 3.7 61, 8 34.5 100 3.8 57.3 38.9 15,117.25 19.45 2135 0.49 0.01 1.8 2140 0.48 0.01 1.5 55 1.60 6.61 57 1.61 6.60 0.45 0.43 Table2 Pressure, MPa .2 ±. J -OzI - i-ix2-- 90 10 90 10 90 10 4,55,05,2 65.461,458.0 30.1: 33.636.8 16.518,6-20,4 Material balance and characteristics of the products obtained Quality of calcined coke: Density, kg / m Sulfur content, wt.% Ash content, wt.% Acid content, wt.% Anisometry The content of grains with anisometry is more than 1.5 relative units, wt.,% Average anisometry, relative units Evaluation of the structure, score. The coefficient of thermal expansion along the axis of expansion, () " Continuation of table 2 Tape, MPa 0.4 0.7 g 1.0 - .. J -.-- b- iiii. 2144 0.47 0.09 1.8 2148 0.46 0.07 1.7 59 1.61 6.7 64 1.62 6.9 0.48 0.44 0.44 Material b; chance and characteristics of the products obtained Heavy gas oil coking coal tar, wt.% Low-sulfur tar, ma -,% Received, wt.%: Gas Distil t Coke Coke in terms of coal tar, masD Quality of calcined coke: Density, kg / m Sulfur content, wt.% Ash, wt.% Acidization, wt.% Anisometry: Grain content with anisomery more than 1.5 rel. Units, wt. Average anisometry, rel. Structure evaluation, point Thermal expansion coefficient along the expansion axis, () x10 1472480 10 Ta6lita4 Pressure, MPa R, I P.7 T. About 60 40 6.0. 61.4 32.6 60 40 7.5 56.9 35.6 27.2 29.7 545963 1.58 1.6 1.62 6.6 6.7 6.9 0.49 0.45 0.45 T a b l and c a 5 eleven Received, wt.%: Gas Distil t Coke The quality of calcined coke: Density, kg / m Sulfur content, wt.% Ash content, wt.% Oxidization capacity, wt.% ....:.: Anisotropy Content of grains with anisotropy more than 1.5 relative units, wt.,% Average anisometry, relative units, Evaluation of the structure, score Thermal expansion coefficient along the expansion axis, (). 1472480 12 Table 35 1.3 A, 5 1.2 1.0 v5