RU2418837C1 - Additive to coking charge - Google Patents

Abstract

FIELD: oil and gas production. ^ SUBSTANCE: as additive to coking charge there is used bituminous residue after production of light fractions of oil products with following characteristics: ash level Ad not more, than 2.5 %; output of volatiles Vdaf not more, than 70%; contents of sulphur Sd not more, than 5 %; swelling as high, as 20 mm; Roga index (IR) as high, as 10. ^ EFFECT: simplification and reduction of cost for production of additives to coking charge. ^ 1 tbl

Description

The invention relates to the production of coke, in particular to additives to mixtures for producing coke.

It is known to use as sintering additive oil residues from oil refining (USSR patent No. 1087077). For this, the oil residues are heated to a temperature of 350-600 ° C under pressure ranging from normal pressure to 150 kgf / cm ² for 0.5-60 minutes in a tube furnace, then they are heated to 380-450 ° C by contact with non-oxidizing gas having a temperature of 400-2000 ° C, to obtain a carbon-containing material having a softening point of 130-300 ° C, a content of bound carbon of 40-80 wt.% and an atomic ratio of N / C of 0.4-1.1, and an aliphatic oil with an atomic ratio of H / C above 1, 55.

A disadvantage of the known additives is the complexity of its production, and accordingly its high cost.

The problem solved by the invention is the simplification of the production of additives to the charge for coking, its cheaper.

The problem is solved in that, as an additive to the coking blends used for the production of metallurgical coke, bituminous residue of the process for producing light fractions of petroleum products with the following characteristics is used:

ash content A ^d no more than 2.5% output volatile V ^daf no more than 70% sulfur content S ^d no more than 5% expansion by the IGI-VUKHIN method not less than 20 mm IR Horn Index not less than 10

Oil residues are non-distillable residues with a boiling point of about 360 ° C, which are formed during atmospheric vacuum oil refining and in the thermocatalytic oil refining processes. These include tars, asphalts, visbreaking residues and other products.

Oil residues are a valuable raw material for obtaining practically useful substances. Currently, oil residues are mainly used in the form of fuel (fuel oil) to produce road bitumen and petroleum coke.

Currently, due to the development of the coke industry, the desire to reduce the cost of the coke production process, improve the quality of coke, oil residues are used as additives in the charge for coking.

Not all oil residues can be used as additives in coking charges. Use the oil residues of some industries, in particular the process of obtaining light fractions of oil products having the above properties.

It was experimentally found that adding to the mixture, consisting of 90 percent of coking coal, 10 percent of the inventive additive, allowed to obtain coke with a reactivity of CRI 28.7 and a strength of CSR 65.7.

At the same time, a coke with a reactivity of CRI 33.0 and a strength of CSR 61.1 was obtained from a mixture consisting only of coking coals.

Thus, it was found that the addition of the inventive additive to a high-quality coking charge makes it possible to obtain coke with properties similar to those of coke obtained from the best coking coals of the world.

The experiments showed the possibility of using the inventive additive as an additive to coal blends.

The inventive additive improves the coking and sintering properties of coal blends due to its own high "fluidity" at coking temperatures, which leads to a significant compaction of the coal load as a whole and to an improvement in the contact conditions of coal grains of any quality during sintering in lump coke.

The amount of additive is not included in the scope of legal protection of the present invention, because the amount of the additive will be determined by the properties of the mixture to which the additive will be added, as well as the properties of the product to be obtained at the outlet (coke).

The claimed invention is illustrated by the example presented in the table.

Charge 1 is a charge consisting of 90 percent of coking coal of Russia and 10 percent of the claimed additive.

Charge 2 is a charge consisting only of coking coals of Russia.

Component Component Quality Score Coke quality A ^d ,% V ^daf ,% s ^d ,% Swelling IR (1: 5) CRI CSR Russian coking coals 6.2 24.4 0.32 16 thirty The inventive additive 0.87 65,4 4,50 153 57 Charge 1 5.67 28.5 0.74 35 - 28.7 65.7 Charge 2 6.2 24.4 0.32 16 - 33.0 61.1

Indicator A ^d - ash content; V ^daf - yield of volatiles; S ^d is the sulfur content; IR-Horn index (characterizes the coking ability of a component); CRI - an indicator of the reactivity of coke; CSR is an indicator of the post-reaction strength of coke.

Charge 2 in terms of its quality characteristics corresponds to the best Russian coals.

As can be seen from the table, the coke obtained from the mixture 1 (with the claimed additive), had greater strength than coke obtained only from coal. Moreover, the level of its quality corresponds to coke obtained from Australian coals of the NSS brand.

The advantage of the proposed additive is its cheapness, due to the possibility of its use without any preliminary technological operations - heating, etc .; for the production of additives does not require sophisticated special equipment. In addition, the proposed additive can improve the properties of coke, namely it allows to increase the strength of coke, which allows us to consider it a conditioning (improving) additive, which allows you to bring the properties of coke to the necessary condition.

Using the proposed additives allows you to utilize the tar residues of the process of obtaining light fractions of oil products, which currently have not found wide qualified application.

Claims (1)

The use of additives for coking bituminous residue of the process of obtaining light fractions of petroleum products with the following characteristics:
Ash A ^d not more than 2.5%;
yield of volatile V ^daf not more than 70%;
sulfur content S ^d not more than 5%;
expansion at least 20 mm;
Horn Index (IR) of at least 10.