SU941392A1 - Process for producing coke - Google Patents

Description

(54) METHOD OF COX PRODUCTION

, .- The invention relates to ferrous metallurgy, mainly to coking industry, and can be used in the thermal processing of coal charges using coke oven gas for their treatment. A known method for producing coke in periodically operating chamber furnaces involves the supply of coal charge into the coking chamber and subsequent heating to 100 O-1. Obtaining a coke of satisfactory quality by this method is possible only when using charges containing significant amounts of coking coal. With the presence of coking coal deficiency, more loosely coals are introduced into the coal charge, which leads to a decrease in the coke yield from the charge and the qualitative characteristics of coke. The closest to the invention to the technical essence and the achieved result is the method of obtaining the bone, including heating the coal charge to the coking temperature and the subsequent processing of the coke produced with a hot coking gas. The method makes it possible to improve the quality of the obtained (W2 t2. However, due to the fact that the process is carried out in several stages, the duration of the process of the southerner is increased. The purpose of the invention is to accelerate the production of high-quality coke. The goal is set According to the method for producing coke, including heating the coal charge to the coking temperature and treating hot coal with a coking gas, processing the hot coking gas is carried out in the process of heating the charge from to the coking temperature. coke coke. In addition, as a result of the interaction of the vapor – gas phase of coking with the psnverhey of the heated semocoke and coke, due to the pyrolysis of hydrocarbon products contained in the gas and resin, pyrolytic carbon is formed, which deposits on the surface of the pores and coke and elimination of its output.In this interaction, part of the organic sulfur, which usually remains in the coke, is converted into gaseous products and is carried away with gas, which contributes to the reduction of the sulfur content in the coke. FIG. 1 is a diagram of an industrial installation implementing the proposed method; in FIG. 2 a coke oven, longitudinal section; in fig. 3 - laboratory installation implementation method. The industrial installation includes coca chambers 1, stand 2, located on the machine side of the coke oven chambers, pipe 3, connecting through a reversing valve 4 stand ki 2 to the gas pipeline. Pipeline 5 through valve 6 is connected to channel 7 and holes 8, made in The bottom chamber masonry array 1. Reverse taps 4 and 6 are connected by cables 9 with a winch 1O, which serves for opening and closing taps. An automatic pressure regulator 11 is installed on the gas pipeline 5, the coke oven gas is withdrawn from the coking chamber 1 through the pipeline 3 in the stand 2 from the engine side of the coke oven battery. The gas is withdrawn from the chamber at 7-8 hours of coking, when the composition of the gas is most suitable for treating the coke in order to increase its yield and strength. Approximate composition of coke oven gas for 7-8 hours of coking coal loading,% Hfj 58; CH4 29; 3; WITH 60; CO (2 1.8; OQ О, 8. The temperature during this period of coking fluctuates within 3QO - 50О ° С in the axial plane and 900 95СРС near the chamber walls. Supply of coke oven gas from stand 2 to the common gas pipeline 5 located under the gas collector From the main side, it is carried out through reversing taps 4. From the common gas pipeline 5, located on the service platform, the gas through the reversing valve 6 enters the channel 7, located in the masonry massif under the coke oven chamber and then through special holes 8, located at an angle of 45 in the course of the rod In the chamber 1, during the extraction of coke oven gas from the standpipes, the valve in the valve box should be closed and the furnace disconnected from the gas collector. The gas consumption during this period is 300 m / h, and its density is about 48 kg / m. It is selected simultaneously from five furnaces, in which the coal charge is at 7-8 hours of coking, and is fed to the processing of five furnaces, which are at 11-12 hours of the coking period, within an hour. in the oven, is 192O Pa or 196 mmwater, Art. This gas pressure ensures that it passes through the entire layer of coke in height, since the pressure loss of the coke cake is 237 Pa or 24 mm of water. The st, to the horse of the 1-coking period basically forms the formation of the coke structure. Due to the pressure of the bursting of the coke cake, it is divided along the longitudinal plane (seam) into two halves, and also due to the shrinkage of the semi-coke and coke, each half of the OTXOAHt pie from the walls of the coking chamber and on the outer surface of the coke pieces are formed ramified trays. Therefore, in the process of treating the coked mass in an industrial furnace, the conditions for the possible passage of gas through the entire layer of coke cake are created. The temperature of the gas supplied to the processing of coke, in connection with its selection from the furnace chambers at 7–8 o'clock during the coking period, is 65О -. The residence time of the gas in the coke layer is 12 min, which ensures sufficient pyrolysis of the coke oven gas components on the coke surface, due to which its output increases by approximately 1%. Strength properties increase on average to 4%. Example. The tests are carried out in a laboratory setting (ir. 2) consisting of a retort 12 heated by two furnaces 13. Inside the retort there are two ne | fory-eroded discs 14, which will be obstructed by two coal charge loads of 10OO g crushed to the content of 0-3 mm - 100% (I-II). Temperatures in the retort are measured by thermocouples placed in special tubes 15. Temperatures are set at an average level of coal load 16. The pressure required to coke the coal in the upper part of the retort is created by the load that is fed from the top of the press 17. Gases from the retort exit through pipe 18 in the cruiser retort. The entire installation is placed on a stand 19 for convenience. Heating, the upper part of the retort, is performed at a speed of 3 deg / min and the lower part is 5 deg / min. Charge in the period

its coking in the upper part of the retort is treated at 55D, 750, and 10OO ° C by volatile products of the thermal destruction charge in the lower part of the retort. Processing period AOR min.

The treatment of the asoxed charge is carried out as follows.

At the same time, the upper (I) and lower (P) parts of the retort are heated. 1 to. After the 30 minute treatment of the top loading, the lower furnace is turned off, and in the upper part of the retort, xixing continues until.

The upper part of the retort is heated to a lower to a temperature of no more. After 30 minutes of processing the top load at these temperatures, the bottom furnace is turned off, and coking continues in the upper part of the retort.

In the upper part of the retort, coking is carried out until, when this temperature is reached, the temperature in the lower part of the retort should be no more than

. The processing of coke takes about 30 minutes, after which they proceed as in the previous cases.

To obtain comparative data, conventional coking is carried out at the top of the retort.

The conditions of the experiment ensure the contact of volatile products of thermal destruction of coal with the mixture during the period of its semi-coking, the transition from the state of semi-coke to coke, and the final form; world structure of coke. Thus, the conditions of the experiment are similar to those of industrial coking.

The obtained coke is subjected to tests for dropping from 1 meter of 1 m to the steel rod, its mechanical strength is examined by rolling in a four-second drum to the laboratory coking unit in the UKHIN furnace. The strength of the porous coke body is determined by the Hryznova method and a coke technical analysis is performed.

The characteristics of the test mixture and the test results are presented respectively in table. 1 and 2.

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0 CNJ The test results show that the treatment of coal loading in the coking chamber with volatile products of its thermal destruction, starting with the flock of coke conversion into coke and prior to the formation of coke structure at 60O – OOOOS, improves the mechanical strength and strength of the coke porous body, an increase in coke yield from the charge and a decrease in the sulfur content in the coke. The use of the proposed method in conjunction with the known provides an acceleration of the process of obtaining coke, the possibility of obtaining high-quality coke without special costs for additional equipment and technological operations. The technical and economic effect of using the invention is obtained due to the high yield of high-quality 94

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. t 92-1Q coke, which leads to improved operation of blast furnaces and the quality of cast iron. Formula of the Invention A method of producing coke, including heating the coal charge to a charging temperature and treating with a hot gas of coking, characterized in that, in order to accelerate the process, the treatment with hot gas of coking is carried out in the process of heating the charge from to the temperature of coking. Sources of information taken into account in the examination 1. R. Leybovich and others. Technological and coke production. M., Metallurgists, 1966, p. 138-142. 2. The patent of Germany No. 2837416, cl. From 10 to 57/18, published 03/20/80.

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Claims (1)

Claim A method of producing coke, including heating the coal charge to the coking temperature and treating with the hot coking gas, characterized in that, in order to accelerate the process, the hot coking gas is treated during the heating of the charge from 600% to the coking temperature.