SU1096276A1 - Method for coking partly briquetted coal batches - Google Patents

Abstract

METHOD OF COKSING PARTLY BRIQUETTED COAL SILES, INCLUDING dosage of the components of the charge, separation of the charge into briquetted and non-briquetted parts, tarring with a bonding material, briquetting the mixture, mixing the briquettes with the non-bricketed part of the mixture and coking asybey; and to simplify the method, sludge hydrogenation coal is used in the amount of 4-10% of the weight of the briquetted part of the charge as a binder material.

Description

The invention relates to the field of coal processing and can be used. used during the coking of partially briquetted coal blends at coke-chemical plants. A known method for coking partially briquetted coal charges using briquettes obtained using coal tar as a binder material during briquetting. The method includes dosing the charge components, dividing the charge into briquetted and non-briquetted parts, drying to less than 0.5% moisture and mixing the briquetted part with the bonding material when heated, briquetting the mixture, mixing the briquettes with the non-bricked portion of the charge and coking the partially briquetted charge obtained in coke ovens. The mixture of the briquetted part of the mixture with the binder material is mixed at a mixture temperature of 90-100 ° C and a temperature of binder material (coal tar) of 90-140 ° C, the briquetting of the mixture is carried out at 70-90 ° C. 1. The method is characterized by the mechanical strength of the coke produced. , which leads to an increase in its consumption in blast-furnace production, a decrease in the productivity of the blast furnace and a deterioration in the distribution of gases over the blast furnace section; the need to dry the briquetted portion of the charge before mixing with the binder to a moisture content of 0.5%, which requires large energy consumption and complicates the process; In addition, it is necessary to heat briquetting at 7090 ° C before mixing the briquetted portion of the charge to 90-100 ° C and coal tar up to 70-14 ° C, which also requires high energy consumption. The insufficiently high mechanical strength of the produced coke is explained as follows. During the coking of partially briquetted coal mixtures, the briquettes expand to the extent of the coke oven, which increases the density of the charge being coked, thereby increasing the strength of the coke produced. However, when used for the coking of briks, obtained using coal tar as a binder material, this expansion is insignificant, as a result of which the mechanical strength of the coke produced is low. High energy consumption during drying of the briquetted portion of the charge, heating it, as well as the coal tar before mixing, is caused by poor wettability of the surface of the unheated wet charge with coal tar having a high viscosity (337 cP at 40BO C). The purpose of the invention is to increase the mechanical strength of coke and simplify the method of coking partially briquetted coal charges. The goal is achieved according to the method of coking partially briquetted coal charges, including the dosage of charge components, separation of the charge into briquetted and non-briquetted parts, mixing of the briquetted part of the charge with coal hydrogenation sludge in the amount of 4-10% of the mass of the charge when heated, mixture briquetting, mixing the briquettes unbriquetted part of the charge and coking in coke ovens. The use of hydrogenation sludge as a binder in the preparation of briquettes eliminates the preliminary drying of the charge to a moisture content of less than 0.5% due to the fact that the hydrogenation tjuiaM well wets the coal grains due to the presence of low molecular weight polar hydrocarbons. This allows satisfactory mixing of the hydrogenation sludge with a working humidity of 8-10%, which simplifies the process. Since the hydrogenation sludge has a low viscosity, the hydrogenation sludge is mixed with the briquetted portion of the charge and the briquetted mixture can be carried out at a lower temperature (4050 ° C), which also simplifies the process. The method is carried out as follows. The crushed coal is metered, the resulting mixture is divided into briquetted and non-briquetted parts, the briquetted part of the charge is mixed with ICO hydrogenation sludge at 40-50 ° C, briquetted in the press at 40-50c, the briquettes are mixed with the unbriquetted part of the charge and the partially briquetted material is mixed with the bulk material. furnaces. Example 1. Conduct coking. Of a partially briquetted mixture of the following composition, wt.%: Grade G coal Grade G coal Grade K coal Coal grade OS with the following characteristics, wt.%: I Operating humidity 8.44 Sulfur content2.18 Ash content6 , 87 Volatile matter yield 28,4 Coal hydrogenation sludge is used as a bonding material - waste of liquid fuel production, which is a mixture of May.%: Hydrocarbon oils Unreacted coal grains Catalyst grains and mineral impurities The grades with a grade of 3–0 mm are divided into briquetted (25 wt.%) and non-briquetted (75 wt.%) parts. The briquetted charge hour and the hydrogenation sludge are heated to 45 ° C, then thoroughly transferred (the slurry content in the mixture is wt.%) And subjected to batching in a laboratory press at 55 ° C and a pressing pressure of 188 kgf / cm (18.8 MPa) with obtaining briquettes in the form of a lens weighing 25 g. The briquettes are mixed with the non-briquetted part of the charge and the obtained partially briquetted charge is subjected to coking in the Ukhin laboratory furnace. The resulting coke is tested for mechanical strength, the yield of metallurgical coke is determined. The mechanical strength of coke in terms of Mjg is 91.2%, the yield of metallurgical coke is 98.5%. Example 2. The briquetted part of the coal mixture obtained under the same conditions is subjected to drying to a moisture content of less than 0.5%, then it and the coal tar (8% by weight of the mixture) are heated to 90-E5 ° C, mixed thoroughly and briquetted laboratory press at 85 ° C and a compaction pressure of 188 kgf / cm (18.8 MPa). Further operations are carried out under the same conditions as in Example 1. The mechanical strength of the obtained coke in terms of the indicator is 90.4%, the yield of metallurgical coke is 97.4%. The results of the experiments are given in table. 1. Table 1

Less Stone 90-100 90-140 0.5 coal tar

Sludge from 8-10 rogenization - 40-50 From the data table. 1, it can be seen that the mechanical strength of the coke obtained by the proposed method is higher by 1.2% in terms of the fact that during coking the briquettes increase significantly (1.3-1.4 times) in volume, compaction to the mixture and providing coke hardening. On the other hand, hydrocarbon oils with a high content of hydrogen (10–12%) that are part of the hydrogenation of isham, undergo thermal decomposition during coking resulting in the appearance of new carbon bridges connecting the coal grains to the monolith and the formation of an active one.

70-90

97.4

90.4

87.9

98.5

40-50

40-50

91.2

88.7 of hydrogen, which has a positive effect on the sintering process of coal. The yield of metallurgical coke is 1.1% higher. At the same time, in the proposed method there is no complicated technological operation of drying the mixture to a moisture content of less than 0.5 wt.%, Requiring high energy costs, the heating temperature of the charge and the mixture before mixing them and the briquetting temperature are significantly (20–100 s) lower, which also simplifies the method and reduces energy costs. Heating of the charge and binder up to 40-50 s is carried out in the mixer, which is included in the set of an industrial press, with low-pressure steam.

Reducing the heating temperature of the charge and the binder as well as the temperature of briquetting below is impractical due to the increased viscosity of the coal hydrogenation sludge and consequently worsening its distribution over the surface of the coal grains, and increasing the temperature above 50 ° C significantly increases energy consumption preheating the mixture before feeding it to the press mixer.

In tab. 2 shows the data on the mechanical strength of coke, obtained from partial briquetted coal grade K2 with different sludge content and hydrogenation mixed with the briquetted part

coal

table 2

From the data table. 2 that coke of the highest possible strength is obtained when the hydrogenation sludge content in briquettes is from 4 to 10%. A lower binder content in the mixture prevents the production of mechanically stable briquettes that would not collapse during their supply to the coke oven, and a higher content is undesirable due to the deterioration of the quality of coke due to excessive swelling of the coal and charge and excessive loading porosity. .

The use of the proposed coking method of coking partially bricketed coal charges provides, in comparison with the basic method, an increase in the mechanical strength of the produced coke and an increase in the yield of metallurgical coke by 1-2%; a decrease in the heating temperature of the briquetted portion of the charge, as well as the temperature of the mixture briquetting by 20-100 ° C, which reduces energy consumption; reduction of a complex and energy-intensive stage of the process - pre-drying the mixture before mixing with the binder, which greatly simplifies the method; the replacement of the scarce product of coke production (coal tar) by coal hydrogenation sludge, which is a waste of synthetic liquid fuel production; an increase in the yield of chemical products of coking (benzene, tar, hydrogen, methane) during coking due to the thermal degradation of hydrogenation shetam in coke ovens with the formation of these products

Claims (1)

(5 7) METHOD FOR COKING PARTIALLY BRIQUETTED COAL MINES, ON? which dosing the components of the charge, separation of the charge into briquetted and non-briquetted parts, change with a binder material, briquetting the mixture, mixing briquettes with the non-briquetted part of the mixture and coking, characterized in that, in order to increase mechanical strength, coke and simplify the method, as a binder material use a slurry of hydrogenation of coal in an amount of 4-10% by weight of the briquetted portion of the charge.