RU2496850C2 - Dry coke quenching method - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: dry coke quenching method involves coke loading to an antechamber of a dry coke quenching plant and its cooling in a coke-cooler plenum with circulating inert gases. Hot bulk coke is loaded to the antechamber together with briquettes on the basis of bituminous coals or coke (semi-coke) fines of the following sizes: for metallurgical coke - with fineness of 25 mm, for obtaining coke nut - with fineness of 25 mm in quantity of 10-15% of the loaded coke weight. Mixture of coke with briquettes is kept in the antechamber for 45-60 minutes.

EFFECT: invention allows increasing the yield and improving qualitative characteristics of all product classes of bulk coke.

Description

The invention relates to the production of coke, mainly to methods for dry quenching of coke, and allows to increase the yield of coke through the use of briquettes based on coal or coke (semi-coke) fines.

A known method of dry quenching of coke (see. Davidzon R.I. Master of the installation of dry quenching of coke. - M .: Metallurgy, 1980, p.20), which consists in finding coke loaded in the prechamber of the dry quenching of coke (CTC), during 45-60 min followed by cooling of the coke in the quenching chamber by circulating inert gas. The disadvantage of this analogue is the non-use of the thermal potential of the mass of hot coke in the CCC chamber.

The closest in technical essence and the achieved result is the method of dry quenching of coke (see RU, AS No. 1353797, class C10B 39/02, 1984), which consists in the fact that when loading coke in the pre-chamber, the USTK is loaded with it non-sintering coal with a grain size of less than 10 mm in the amount of 10-15% of the loaded coke, and the mixture of coke with coal is kept in the prechamber for at least 45 minutes, after which it is cooled in the extinguishing chamber by circulating gases. The disadvantage of this prototype is that the use of non-sintering coal with a particle size of less than 10 mm allows you to get only additional quantities of coke breeze, which is the cheapest class of bulk coke.

The objective of the present invention is to increase the yield and improve the quality characteristics of all product classes of gross coke (including blast furnace). It is proposed to solve this problem by adding briquettes on the basis of coal or coke (semi-coke) fines to the hot coke entering the USTK pre-chamber, the following sizes: to obtain metallurgical coke - larger than 25 mm, to obtain coke nut - 25 mm in size, in the amount of 10 -15% by weight of coke.

The inventive method of dry quenching of coke, including loading into the pre-chambers of the CCFD hot gross coke together with briquettes based on coal or coke (semi-coke) fines in the amount of 10-15% by weight of the loaded coke and holding this mixture in the prechamber for 45-60 min

Description of the method: loading briquettes on the basis of fossil fuels or coke (semi-coke) fines into the coke box car body in the amount of 10-15% of the weight of the loaded coke; unloading of hot coke from a coke oven into the body of a coke oven car; unloading of a mixture of coke and briquettes from the body of a coke box car into the USTK prechamber; exposure of the mixture in the pre-chamber CCUT for 45-60 minutes; unloading a mixture of coke and coke briquettes from the prechamber into the extinguishing chamber; extinguishing the mixture with inert gases; unloading the cooled mixture from the quenching chamber.

The control of the yield and properties of the obtained coke is realized by feeding the required size and quality into the mixture of briquettes. To obtain metallurgical coke, briquettes with a particle size> 25 mm are added to hot coke. To obtain coke nut - briquettes with a particle size of 25 mm. Example 1. Under semi-factory conditions, 100 kg of hot coke, loaded at 1000 ° С, and 15 kg of dust-based briquettes USTK with the addition of 10% binder (lignosulfonate concentrate) are mixed and kept in a closed heat-insulated container for 45 min (60 min). . The size of the briquettes: diameter - 54 mm, height - 30 mm. After the mixture is cooled, coke with a particle size> 25 mm is screened out on a screen. The technical analysis of the initial briquettes, coke briquettes, initial coke and coke obtained after cooling a mixture of hot coke with briquettes is given in table 1:

Table 1 Ash content, A ^d ,% The yield of volatiles, V ^daf ,% Sulfur content, S ^d _t ,% Strength, M ₂₅ ,% Strength, M ₁₀ ,% Product holding time 45 min holding time 60 min holding time 45 min holding time 60 min holding time 45 min holding time 60 min holding time 45 min holding time 60 min holding time 45 min holding time 60 min Source briquette 10.8 6.9 0.7 86 10 Source coke after cooling 11.6 1,2 0.6 83 eleven Coke briquette after cooling 12.3 13.5 1,6 1,5 0.7 0.7 88 89 9 9 Coke obtained after cooling a mixture of hot coke and coke briquettes 11.7 11.9 1.3 1,2 0.62 0.62 84 84 10.5 10.5

Example 2. Under semi-factory conditions, 100 kg of hot coke loaded at 1000 ° C and 15 kg of briquettes based on coal slurries of the KSN grade of the Anzherskaya enrichment plant with the addition of Anzherskaya are mixed and kept in a closed heat-insulated container for 45 min (60 min). 8% binder (lignosulfonate concentrate). The size of the briquettes: diameter - 54 mm, height - 30 mm. After the mixture is cooled, coke with a particle size> 25 mm is screened out on a screen. Technical analysis of initial briquettes, coke briquettes, initial coke and coke obtained after cooling a mixture of hot coke with briquettes is given in table 2:

table 2 Ash content, A ^d ,% The yield of volatiles, V ^daf ,% Sulfur content, S ^d _t ,% Strength, M ₂₅ ,% Strength, M ₁₀ ,% Product holding time 45 min holding time 60 min holding time 45 min holding time 60 min holding time 45 min holding time 60 min holding time 45 min holding time 60 min holding time 45 min holding time 60 min Source briquette 6.0 21.3 0.7 81 eleven Source coke after cooling 11.6 1,2 0.6 83 eleven Coke briquette after cooling 10.6 11.8 2,5 2.0 0.7 0.7 82 82 10 10 Coke obtained after cooling a mixture of hot coke and coke briquettes 11.5 11.6 1.4 1.3 0.62 0.62 82.5 82.5 10.5 10.5

Example 3. In semi-factory conditions, mix and incubated in a closed thermally insulated container for 45 minutes (60 min.) 100 kg of hot bulk coke loaded at 1000 ° C, and 15 kg of briquettes based on brown coal semicoke (BOD) with the addition of 20% binder (lignosulfonate concentrate). The size of the briquettes: diameter - 20 mm, height - 15 mm. After cooling the mixture, the coke nut with a grain size of 10-25 mm is screened out on a screen. Technical analysis of initial briquettes, coke briquettes, initial coke nut and coke obtained after cooling a mixture of hot coke nut with briquettes is given in table 3:

Table 3 Product Ash content, A ^d ,% The yield of volatiles, V ^daf ,% holding time 45 min holding time 60 min holding time 45 min holding time 60 min Source briquette 6.2 12.1 The original coke nut after cooling 13.0 4.0 Coke briquette after cooling 9.8 10.8 6.2 4,5 Coke obtained after cooling a mixture of hot coke nut and coke briquettes 12.5 12.7 4.3 4.1

Thus, the task was solved by adding 10-15% of briquettes based on coal or coke (semi-coke) fines to the red-hot gross coke of the following sizes: to obtain metallurgical coke - larger than 25 mm, to obtain coke nut - 25 mm in size.

Claims (1)

Dry coke quenching method, including loading coke into a pre-chamber of a dry coke quenching unit and cooling it in a quenching chamber by circulating inert gases, characterized in that the hot bulk coke is loaded into a pre-chamber together with briquettes based on coal or coke (semi-coke) fines of the following sizes: for metallurgical coke - larger than 25 mm, for coke nut - 25 mm in the amount of 10-15% by weight of the loaded coke, and the mixture of coke and briquettes is kept in the prechamber for s 45-60 min.