RU2769188C1 - Composition of charge for producing metallurgical coke - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to coke-chemical industry, namely to composition of charge for production of metallurgical coke. Charge includes: mixture of coal of sintering groups: G (gas), and/or GF (gas fat), and/or GFL (gas fat lean), and/or F (fat) and lean groups: LCC (low-caking coke) and/or LC (lean caking) in weight ratio of 1:1.15 in amount of 60–93.5 wt. % and petroleum coke obtained by delayed coking of heavy oil residues, with a sintering capacity of 75–100 units (GOST ISO 15585-2013) in amount of 6.5–40.0 wt. %.

EFFECT: development of charge for coking of special composition, which allows to expand and reduce the cost of raw material base of used charge with improvement of quality of metallurgical coke with improved strength characteristics.

1 cl, 2 tbl, 3 ex

Description

The invention relates to the coke industry, and in particular to the composition of the charge for the production of metallurgical coke.

It is known that in order to improve the technological characteristics of charges, increase

quality of coke, economy of scarce grades of coal, it is proposed to use various organic additives, such as solid waste from coke production, petroleum coke breeze, non-caking coals, and other additives, while ensuring the strength characteristics of coke and reducing production costs.

It is known to use a mixture for metallurgical coke, consisting of coking coal, a plasticizer of waste coke production in the amount of 0.5-7% of the mass. (RU No. 2333236, 10.09.2008), and bituminous residue of the process of obtaining light fractions of petroleum products with the following characteristics: ash content A ^d not more than 2.5%; the yield of volatile V ^daf is not more than 70%; sulfur content S ^d not more than 5%; swelling of at least 20 mm; Horn index (RI) not less than 10 (RU No. 2418837, 05/20/2011).

A significant disadvantage of using the above inventions is the impossibility of using plastic components in the charge of coke production due to possible agglomeration of particles and sticking, the need to reconstruct technological equipment in the coal preparation or coke shops, as well as the possibility of replacing only certain grades of coking coal due to the relatively low level of volatile substances.

A known method (RU No. 2663145, 08/01/2018) for preparing a charge for coking, which consists in mixing an oil sintering additive with weakly caking coals of the KS and/or KSN and/or KO and/or TS and/or OS grades in the following ratio components, wt. %:

- oil sintering additive (1-30),

- weakly caking coals (99-70),

oil sintering additive is a residue of oil refining with the following characteristics:

- ash content A ^d - no more than 2.5%;

- volatile V ^daf - no more than 90%;

- sulfur content S ^d - no more than 5%;

- softening temperature according to KiSh - not less than 40°C.

The disadvantage of this invention is the lack of technologies for supplying components in a liquid state to the coal charge and, as a result, the impossibility of applying the invention on an industrial scale.

It is known to use in the composition of the charge for coking as an oil additive the product of delayed semi-coking of heavy oil residues with a volatile content of 12 to 28% of the mass. (RU No. 2355729, 20.05.2009; No. 2411283, 10.02.2011; RU No. 2563493, 2015; RU No. 2637965, 08.12.2017).

The disadvantage of the additive according to these patents is the instability of its sintering properties, the insufficient level of coking of the additive and, accordingly, the unstable quality of the resulting metallurgical coke, as well as the lack of a description of clear boundaries for the use of this product in the composition of the charge of coke production, which causes difficulties in assessing the impact of the participation of this product on quality of metallurgical coke.

It is also known to use in the composition of the charge a mixture of petroleum coke in the amount of 1-30% of the mass. and oil residues in the amount of 1-30% of the mass.

Used oil residues are characterized by ash content A ^d not more than 2.5%, volatile matter V ^daf not more than 90%, sulfur content S ^d not more than 5%, Horn index (RI) not less than 10. Petroleum coke is characterized by ash content A ^d not more than 2.5%, volatile matter V ^daf not more than 25%, sulfur content S ^d not more than 5%. (RU No. 2627425, 08.08.2017).

A significant disadvantage of using the invention is the need to reconstruct the process equipment in the coal preparation or coke shops.

The closest composition of the charge for coking is the composition of the charge proposed in the method for producing metallurgical coke (RU No. 2553116, 2015), which is used as a carbon-containing charge with a content of 50-100 wt. % petroleum coke with volatile matter from 14 to 25 wt. % obtained by delayed carbonization of heavy oil residues.

The disadvantage of the described method using a carbonaceous charge is the complexity of using equipment made specifically for this method.

The objective of the invention is to develop a charge for coking of a special composition, which makes it possible to expand and reduce the cost of the raw material base of the charge used with an improvement in the quality of metallurgical coke: with improved strength characteristics (coke strength after CO ₂ reaction (CSR) in the range of 60-66% and coke reactivity ( CRI) in the range of 23-28%).

The task is solved by developing a special charge composition for coking to obtain metallurgical coke, including:

- a mixture of hard coals of sintering groups: grades G (gas) and / or GZh (gas fat) and / or GZhO (gas fat lean) and / or Zh (fat), and lean groups: grades KS (coke low caking) and / or OS (lean sintering), in a ratio of 1 ÷ 1.15 (as part of a mixture of coals of sintering groups, coals of grades G, GZh, GZhO, Zh, as well as coals of grades KS, OS in mixtures of lean groups, respectively, can be used as interchangeable without deterioration characteristics of the resulting coke),

- petroleum coke obtained by delayed coking of heavy oil residues, with a sintering index of 75-100 units,

with the following ratio of components, % wt.:

a mixture of sintering coals and emaciated groups in the ratio 1÷1.15 60-93.5 petroleum coke 6.5-40.0

It should be noted that, as part of a mixture of hard coals of sintering groups, coals of grades G, GZh, GZhO, Zh, as well as coals of grades KS, OS in mixtures of lean groups, respectively, can be used as interchangeable without deteriorating the characteristics of the resulting coke.

Experiments conducted by the authors of the present invention on charges of various grades at a ratio of sintering and leaning groups of coal 1:1.15 with the introduction of petroleum coke into the mixture in an amount of 6.5-40% wt. showed that it is possible to obtain metallurgical coke with improved strength characteristics.

The possibility of replacing the coal component with petroleum coke is explained by the fact that petroleum coke has a dual effect on the sintering process: on the one hand, it acts as a lean additive, on the other hand, as a sintering component, since petroleum coke contains liquid products and has the ability to influence pyrolysis processes coal mass.

Examples of the invention.

Example 1

For the implementation of the invention, the charge of the coke production of the following composition was used, wt %:

(G + GZh + GZhO + G) = 43.5% wt.; KS = 50.0% wt.; petroleum coke = 6.5% wt.

(G + GZh + GZhO + F): (KS) \u003d 1-1.15;

Table 1 shows the qualitative characteristics of petroleum coke.

Similarly, for the implementation of the invention was used charge according to examples 2 and 3 with a ratio of sintering and leaning groups of coal 1:1.15. Data on the quality of metallurgical coke and the dependence on the composition of the charge and the amount of petroleum coke introduced are shown in Table 2.

where W ^r - mass fraction of total moisture; %; A ^d - ash content; S ^d - mass fraction of total sulfur, %; CSR - coke strength after CO2 reaction, %; CRI - coke reactivity, %.

From the data given in table 2, it follows that on charges of various grades with a ratio of sintering and leaning groups of hard coals of 1:1.15 in an amount of 60-93.5 wt.% with the introduction of petroleum coke into this mixture in an amount of 6, 5-40% wt. metallurgical coke with improved strength characteristics is obtained: coke strength after CO ₂ reaction (CSR) in the range of 60-66% (in the base case 57%) and coke reactivity (CRI) in the range of 23-28% (in the base case 30%) .

Claims (4)

Charge of a special composition for the production of metallurgical coke, including - a mixture of hard coals of sintering groups: grades G (gas), and / or GZh (gas fat), and / or GZhO (gas fat lean), and / or Zh (fat) and lean groups: grades KS (coke slightly caking) and /or OS (lean sintering) in a mass ratio of 1:1.15, - petroleum coke obtained by delayed coking of heavy oil residues, with a sintering index of 75-100 units. (GOST ISO 15585-2013), with the following ratio of components, wt.%: a mixture of sintering coals and emaciated groups in a mass ratio of 1:1.15 60-93.5 petroleum coke 6.5-40.0