UA147617U - METHOD OF PRODUCTION OF FORMED COKE - Google Patents

Abstract

The method of production of molded coke of monofraction composition from gas and long-flame coal includes separate crushing of coal concentrates, dosing, heating of gas coal, heating of long-flame coal to a temperature of 500-650 ° C, mixing of the obtained semi-coke with heated gas coal, isothermal aging pressing the hot mixture with the formation of one-dimensional molds, coking molds. Heating of gas coal before mixing with semi-coke is carried out 30-40 ° C below the temperature of its transition to the plastic state, and hot semi-coke is fed in an amount that determines the temperature of the mixture 20-40 ° C above the temperature of transition of gas coal to plastic state.

Description

The useful model belongs to the field of production of molded coke and can be used in the coke industry.

A known method of producing formed coke involves grinding coal and coke fines (waste from the coal layer coking process), mixing coal and coke fines at ambient air temperature, heating the mixture to a temperature that exceeds the beginning of the transition of coal to a plastic state by 0.2 -0.3 "C for each percentage of coke content in the charge, isoteric aging, pressing of the hot mixture to obtain molds, coking of molds

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The method is intended for disposal of small amounts of coke fines (waste from the process of layer coking of coal). The disadvantage of the method is the limitation of the raw material base, since for its implementation it is necessary to use good coking coal, which is scarce in Ukraine, and the amount of the second component of the charge of coke fines (waste from the coke layer production process) is limited. The disadvantage of the method is that the use of coke in the charge, the surface of which is chemically neutral, causes poor adhesion with the plastic mass of coking coal and determines the low structural strength of the coke.

A known method of hot briquetting of a mixture of coal and semi-coke includes heating coking coal to a temperature of about 100 "С, and weakly cohesive coal to 700-800 "С with obtaining semi-coke, mixing coal with semi-coke, and the proportion of semi-coking coal in the mixture is 20-40 956, pressing of the hot mixture to obtain molds, coking of molds (21.

The disadvantage of the method is the need to introduce scarce well-coking coal into the charge.

The use of coke in the charge, the surface of which is chemically neutral, determines the low structural strength of the obtained molded coke.

The closest analogue is the well-known method of producing formed coke, which includes heating lignite to a temperature of 570-650 "C, supplying semi-coke to be mixed with coal in an amount that causes the coal to be heated to the temperature of the pre-plastic state, joint heating of the mixture to the plastic state, isothermal holding, pressing of the hot mixture to obtain molds, coking of molds |Z|.

In the proposed useful model, the task of improving the method of obtaining is set

From formed coke to ensure high structural strength of formed coke by optimizing technological parameters, namely the sequence of heating the components of the mixture to a plastic state.

The task is solved by the fact that in the method of production of shaped coke, which includes separate crushing of coal, dosing, heating of low-sintering coal to a temperature of 570-650 C, heating of high-sintering coal, mixing with hot semi-coke, pressing of the hot mixture to obtain molds, coking of molds, heating of gas coal to mixing with semi-coke is carried out 30-40 "С below the temperature of its transition to a plastic state, and semi-coke for mixing with heated coal is supplied in an amount that causes the temperature of the mixture to be 20-40 "С above the temperature of the beginning of the transition gas coal in a plastic state.

The cause-and-effect relationship between the set of essential features of the invention and the achievable technical result is as follows: 1. Heating gas coal before mixing with semi-coke to a temperature 30-40 "C below the temperature of the transition to a plastic state determines the optimal thermal balance of coal heating during mixing with hot semi-coke, the optimal temperatures for obtaining which are 550-650 76.

Obtaining semi-coke above the temperature of 650 "C determines the decrease in the structural strength of the produced coke.

Obtaining semi-coke below a temperature of 550 "C also determines a decrease in the structural strength of the produced formed coke. 2. Supplying semi-coke to be mixed with heated gas coal in an amount that determines the temperature of the mixture by 20-40 "C above the temperature of the beginning of the transition of gas coal to a plastic state, determines optimal viscosity of the plastic mass of coal during the formation of molds.

If the gas coal heating temperature is not optimal (no more than 20 "C above the temperature at which the gas coal transitions into a plastic state), then the viscosity of the plastic coal mass will be high, which does not allow even with a significantly increased pressure of movement to obtain dense moldings, and accordingly formed coke with low strength.

If the gas coal heating temperature is higher than the optimum (40"C higher because the temperature at which the gas coal transitions into a plastic state) then the viscosity of the plastic coal mass will also be high, which does not allow even with a significant increase in pressing pressure to obtain dense formations, and accordingly coke obtained with low strength.

A set of distinctive features provides a solution to the task of producing molded coke with high structural strength.

Example. The characteristics of the coal used for the production of molded coke are given in Table 1.

Table 1 osh.Dobropilska.d | 36 | 10 | 14 | 66 | z6l9 (sh. Kurakhivskai | 61 | 6 | 295 | 75 | 4556

The temperature of the beginning of the transition of gas coal to a plastic state is 425 "С. The study of the influence of the conditions of obtaining molded coke on its strength was carried out at a laboratory facility. Heating 1.5 kg of gas coal to a temperature below the transition to a plastic state and semi-coking 2 kg of long-flame coal performed separately in rotary kilns.

Heated gas coal and semi-coke from the rotary kilns were fed into heated receiving hoppers, from which coal and semi-coke were fed into the mixer by dispensers, from the mixer the hot mixture of coal and semi-coke was fed into the heating tank, in which isothermal holding and applying pressure to form cylindrical molds forms with a diameter of 60 mm.

Hot molds were loaded into the furnace for heating to 900 "С.

The furnace heating rate was 5 °C/min.

Table 2 shows the data characterizing the influence of the semi-coke production temperature on the strength of the formed coke.

The amount of semi-coke in the mixture with coal is 45.5 95, the temperature of the mixture of coal with semi-coke is 450 "C, the duration of isothermal exposure is 60 s. The duration of applying pressure to form the molds is 30 s. The value of the forming pressure is 1.9 MPa.

Table 2

Temperature of semi-coke, "С! 520 | 525 | 550 | 600 | 60 | 640 | 650 | 700 o

The structural strength of coke was determined according to the Gryaznov method |4).

According to the data in Table 2, the maximum structural strength of the formed coke corresponds to the semi-coke production temperatures of 550-650 "С.

Table C shows the influence of the temperature of the gas coal mixture with semi-coke on strength

From formed coke. The amount of semi-coke in the mixture with coal is 45.5 96, the temperature of the semi-coke is 600 "С, the duration of isothermal exposure is 6b0s. The duration of applying pressure for the formation of molds is 30 s. The value of the formation pressure is 1.9 MPa.

Table C

The temperature of the gas coal mixture with semi-coke, "S

Exceeding the coal temperature relative to the beginning of transition 10 | 20 | 30 40 in coal in a plastic state, "S

Strength of coke, 96

The data in Table 3 indicate the optimal heating area of gas coal when mixed with semi-coke, which is 20-40 "C higher than the temperature at which coal transitions into a plastic state.

Formed coke samples were obtained under laboratory conditions.

Table 4 presents the regime indicators for obtaining 50 kg of molded coke.

Table 4

The temperature of obtaining semi-coke, "C 00000600

The temperature of the mixture of coal and semi-coke, "S

The amount of semi-coke mixed with coal, 95

Duration of isothermal exposure, sec.

Duration of pressing, sec.

The amount of pressing pressure, MPa

Formed coke is tested according to GOST 5953-93, GOST 10089-73.

The results of the analysis of the quality of formed coke are shown in Table 5.

Table 5

Strength of coke according to GOST 5953-93, Fo

M40 91.3

M10 6.7

Reactivity according to GOST 10089-73 cm3/g-s

Structural strength according to Gryaznov

The data in Tables 2, 3, 5 confirm that the proposed method of obtaining formed coke determines the optimal conditions for achieving high strength of formed coke.

Sources of information: 1. Method of production of molded coke A. p. Mo 356289, S10OV 49/02, 1969. 2. Shubeko P.3. Continuous coking process. - M. Metalurghizdat, 1974. 3. Method of production of molded coke A. p. Mo. 239208, C10OV 7/100. 4. Hryaznov N.S. Fundamentals of coking theory, - M., Metalurghizdat, 1976.

Claims (1)

USEFUL MODEL FORMULA The method of production of formed coke of monofractional composition 3 of gas and long-flame coal, which includes separate crushing of coal concentrates, dosing, heating of gas coal, heating of long-flame coal to a temperature of 500-650 "C, mixing of the obtained semi-coke with heated gas coal , isothermal aging of the mixture, pressing of the hot mixture with the formation of one-dimensional molds, coking of the molds, which is characterized by the fact that the heating of gas coal before mixing with semi-coke is carried out 30-40 "C below the temperature of its transition to a plastic state, and hot semi-coke is supplied in quantity, which determines the temperature of the mixture by 20-40 "C above the temperature of transition of gas coal into a plastic state.