RU1778137C - Method to prepare coach charge for coking - Google Patents

Abstract

The invention relates to the production of coke, in particular, to the preparation of a coal charge for coking and allows to increase the mechanical strength of coke. The mixture is divided into the following classes by size, mm: 6, 6-3, 3-1 and 1, and 10% of oil products with the release of volatile substances are added to the selected classes,%: 16-26, 33-35, 46 and 57 respectively. This makes it possible to increase the mechanical strength of coke in terms of P25 to 93-95% and in terms of Nu to 4.6-4.9%. 4 tab.

Description

The invention relates to the production of coke, in particular, to the preparation of a coal charge for coking.

A method is known for preparing a coal charge for coking, consisting of gas, fat, coke and sintering coals, by crushing them, applying fuel oil to the fat coal, and then mixing all the components. The application of fuel oil on fat coal is carried out before crushing or after crushing, which provides an increase in the uniformity coefficient of coke (AS USSR No. 553274, class C10 B 57/08).

However, the known method does not provide high strength indicators of lump coke.

Closest to the claimed is a method of preparing for the coking of a coal charge, consisting of fatty, coke, gas and sintering coals, including separate crushing of coal, separation from chiric coal before applying fuel oil fine fraction of 0.0-0.5 mm and the introduction of this fraction into the coal charge after mixing the coals (AS USSR No. 998493, class C 10 B 57/12).

The disadvantages of this method are:

-low sintering ability of fuel oil as an organic additive due to its structural and chemical parameters, low yield of coke residue and high yield of volatiles;

- the inability to carry out the method in the preparation of a coal charge according to the LH scheme (charge crushing), according to which all components (D, G, K, OS) are mixed and crushed simultaneously. When mixed with crushed gas, coke and thin-caked coals of heavy coal enriched with fuel oil, the latter is largely locked. As a result, when coking such a mixture, coke is obtained.

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WITH

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with low mechanical strength indices P25.

The aim of the invention is to increase the mechanical strength of coke.

This goal is achieved by the fact that the mixture is divided into size classes, which differ most in sintering capacity, and depending on this parameter, mesogenic (mesophase) oil products of various stages of mesomorphism are added to the selected classes. Mesogenic (mesophase) oil products (MNEs) are heat-treated products of various oil residues under various conditions (temperature and time).

Depending on these parameters, a series of MNPs (MNP-20, MNP-35, MNP-46, MNP-57) was obtained, characterized by a different degree of mesomorphism. The numbers indicate the approximate yield of volatiles from these products, which correlates quite well with their degree of mesomorphism. Due to the specific technological conditions for the preparation of MNEs, these substances have an increased tendency to form a nematic liquid crystal phase (mesophase) during coking, as a result of which coke obtained from them has an increased tendency to graphitization. This is due to their high sintering ability when co-coking with coals, in particular, slightly sintering.

The characteristics of the MNE are presented in table 1.

Comparative analysis with the prototype allows us to conclude that the claimed method of preparing for the coking of a coal charge is characterized in that the charge is divided into size classes that vary most in sintering, and depending on this, mesogenic (mesophase) oil is introduced into the divided classes different products (MNEs) of various stages of mesomorphism, which increase the sintering ability of each of the distinguished classes to the greatest extent. Thus, the claimed technical solution meets the criterion of novelty r Analysis of known technical solutions in the studied area, i.e. in the coke industry, allows us to conclude that there are no signs in them similar to the significant distinguishing features in the claimed method, and to recognize significant technical differences as the claimed technical solution.

The proposed method is carried out as follows.

Coals of grades G, G, K and OS are metered, crushed, and the mixture thus prepared is divided into fineness classes, and organic additives are added to the isolated classes. The prepared charge is sent to coking.

Example. Individual coals of grades Zh, K, G, OS are mixed in the following ratio (Zh-35%, K-15%, G-32%, OS-18%).

crushed according to the DS scheme (charge crushing). Get the production of the charge.

The production charge is divided into 4 fineness classes (6 mm, 6-3 mm, 3-1 mm, mm). The characteristics of these classes, as well as some coals of various stages of mesomorphism that make up the mixture, are presented in Table 2.

To a large class (6 mm), 10% of the mesogenic oil product of a high degree of mesomorphism, MNP-20, is added. To the middle class of 6-3 mm, 10% MNP of an average degree of mesomorphism — MNP-35 — is introduced; to the class of 3-1 mm, 10% MNP of an average degree of mesomorphism — MNP — 46 is added;

small class (1 mm) is injected with 10% MNP of a low degree of mesomorphism - MNP-57.

The distinguished grain size classes of the charge with MNE additives of varying degrees of mesomorphism are sent for coking.

The optimal amount of mesogenic oil product additives is 10%. The results of the studies showed that an increase in the content of the additive leads to a decrease in the quality indicators of coke.

A lower content of additives in the mixture (5-8%) does not give a significant effect, because in industrial conditions it is technically difficult to dose 5-8% of the additive, and it is distributed in the coal charge

unevenly.

At the end of the coking period, the containers, together with the coke, are sent to quenching and delivered to the frame. The coke test was carried out according to the method of UKHIN. The test results are presented in table.3.

From the presented comparative data it can be seen that in comparison with the coking of the charge according to the prototype, the addition to the charge

MNP allows to improve the quality of coke: the abrasion index (Iy) decreases to 4.6-4.9, and the mechanical strength index (P25) increases to 93-95%.

Used in the proposed method

Mesogenic (mesophase) oil products have a differentiated effect on the quality of coke. In this case, the characterization of the size classes, in particular, their sintering ability (Iv), plays an essential role.

Table 4 presents the test data of the Bagleysky CCP charge, divided into size classes, mm: 6, 6-3, 3-1, 1 with the addition of 10% MNP of different stages of metamorphism.

The mixture consists of the following coals, wt.%: G-23, G-19. K-13, (Kv + OS) -17, GZh-4, (Zh + P-24.

As follows from Table 4, the sintering ability of various classes of coal charge, especially in terms of the expansion index (IV), changes with the introduction of petroleum products of various stages of mesomorphism. The maximum Iv index of 73 mm for the +6 mm class is given by the introduction of MNP-20; maximum Iv (75 mm) for class (6-3) mm - in the case of the MNP-35 additive; maximum Iv (74 mm) for the class (3-1) mm - with the introduction of MNP-46; and, finally, for a class of 1 mm, the maximum Iv index of 68 mm was achieved. In the case of the MNP-57 additive,

From Tables 3 and 4 it follows that for a large class (6 mm) with an increased yield of volatiles it is advisable to use MNPs of an increased stage of mesomorphism and, accordingly, a lower yield of volatiles (MNP-20). To the middle classes (6-3 mm and 3-1 mm) it is advisable to introduce MNPs of the middle stage of mesomorphism with a yield of volatile 35-46% (MNP-35, MNP-46). The introduction of MNEs of a reduced stage of mesomorphism with V a 57% to small classes (1 mm) with a relatively low yield of volatiles makes it possible to maximize the quality of coke. The use of one or another MNP can significantly increase the coking ability of each class, while the introduction

additives to individual corners are less effective, especially when introduced to well-caking corners of the middle stage of metamorphism (grade G).

Thus, in order to ensure the highest possible sintering strength and create optimal conditions allowing the formation of the required coke structure, it is necessary depending on the distribution of the charge components into classes

size, determining their sintering ability, to introduce and the appropriate degree of mesomorphism (mesogenic or mesophase) additives, i.e. their properties should be different.

Claims (1)

The claims A method of preparing for the coking of a coal charge, consisting of fatty, coke, gas and lean-flowing coals, including mixing, crushing the charge, introducing an organic additive into it, characterized in that, in order to increase the mechanical strength of coke, the charge is divided into the following classes by size, mm-6, 3-1, and 1, and to the selected classes 10% oil products are added as an organic additive with a yield of volatile substances,%: 16-26, 33-35, 46 and 57, respectively. Table table 2 Table 3 Options 1.77 7.25 29.80 60 30 ll5 ...