SU1682402A1 - Method for control and regulation of distribution of the materials and gases on section of blast furnace - Google Patents

Description

(21) 4727914/02 (22) 12.06.89 (46) 07.10.91. Bul №37

(71) Cherepovets Metallurgical Plant them. 50th anniversary of the USSR

(72) L.A.Vly, E.I. Reich, K.K.Shkodin, V.V.Gaykov, V.A. Ulakhovich, A.P. Kotov, A.K. Ikkonen, N.M. Mozharenko and E. .S.Hom kov (53) 669.162.012.01 (088.8)

(56) USSR Copyright Certificate Mg 1266863, cl. From 21 to 5/00, 1985.

Gimmelfarb A. A., Efimenko G.G. Automatic management of the domain process. - M: Metallurgists, 1969, p. 247-250. (54) METHOD OF CONTROL AND REGULATION OF THE DISTRIBUTION OF MATERIALS AND GASES ON THE SECTION OF A DOMAIN FURNACE

(57) The invention relates to ferrous metallurgy, in particular blast furnace production, and can be used to control and regulate the distribution of ore load along the blast furnace radius. The goal is to increase productivity.

furnaces and reduction of specific coke consumption for iron smelting by optimizing the gas flow distribution. To do this, control the composition of the gas along the radius in the upper part of the blast furnace shaft and the parameters to blow and calculate from them the ratios of the quantities of gasified oxygen and carbon of the charge at various points in the radius. By statistical processing of the technical and economic indicators of the furnace operation and the distribution curves over the radius of the indicated ratios, the optimum values of these ratios (at various points of the radius of the furnace) are found (at a minimum of coke consumption and maximum furnace productivity). The current values of the ratios of the quantities of gasified oxygen and carbon of the charge are compared with the optimal values at all controlled points of the radius. The ore load is controlled along the radius with the current values of these ratios deviating from the optimal ones by 0.1-0.3. 5 tab.

SP

WITH

The invention relates to ferrous metallurgy, in particular to the domain production, and can be used in controlling the course of blast furnaces.

The aim of the invention is to increase the productivity of the furnace and reduce the specific consumption of coke by optimizing the distribution of materials and gas flow over the cross section of the furnace and improving the use of gas energy.

The essence of the invention is to use the ratio of the amount of gasified oxygen and carbon of the charge, calculated at various points of the radius of the blast furnace based on the results of measuring the gas composition at these points in the upper part of the mine and on the parameters of the combined blowing, to control the distribution of the ore load over the cross section of the blast furnace. For the existing charge and blast conditions at each particular blast furnace, by statistical processing of its performance under different loading systems, an optimal distribution along the ratio (Osh) / (Sf) is found, taking the furnace productivity and specific coke consumption as optimization criteria. Comte

00

go

four

about

Yu

the role of ore load distribution over the radius is made by comparing the current values of the specified ratios over the radius with the optimal ones, and the distribution of the ore load over the radius is controlled when the current ratios (Osh) / (Cf) deviate from the optimal ones by 0.1 ... 0 , 3,

When deviations of the current values of the ratio (Osh) / (Cf) from the optimal ones less than 0.1, the mode of ESCAPE does not change, since such deviations can be caused by factors not related to the distribution of ore load and gas flow over the radius. In case of deviations exceeding 0.3, comprehensive measures should be taken to control the furnace progress in accordance with the technological instruction, providing for not only a correction of the distribution of ore load along the radius, but also a change in the blast mode.

The ratio (Osh) | / (United States) of the quantities of gasified oxygen (Osh) | and carbon (Cuj) i the mixture is determined by the following formulas

(United States) + CCM-m -D - (C),

where (SS)) is the amount of gasified carbon in the charge in zone i, kg per 100 m3 of dry gas;

C02i - content in carbon dioxide dry gas in zone i,%;

COi — content of carbon monoxide in dry gas in zone I,%;

(C) is the total carbon content in the fuel blown into the horn,% 100 –C02I –C0i – H2i P | 100 -u) + D- (Nz) where w is the ratio of the volumes of dry combined blowing and dry gas in zone i;

Hat is the content in the dry gas of hydrogen in zone i,%;

(о- oxygen content in the blast,%;

(N2) - total nitrogen content in the fuel blown into the horn,%.

D

Vs 100 Vg 100 -Y where D is the ratio of the volumes of the injected horn fuel and dry blow;

Vs - fuel injected into the forge fuel m / min;

Vg - flow rate of dry blow, m / min; p is the volume fraction of moisture in the blast,%; Y - loss blow,%

) 2Y4 {2s 21 + CO; -H20 (-Pg 2w + p + 2D- (U)

where (Osh) | the amount of gasified oxygen mixture in zone I, kg per 100 m of dry gas;

H20i is the volume of moisture indirectly reduced in gas in zone i,% of dry gas;

(Oa) - the total oxygen content in the fuel blown into the horn,%.

ten

H20i

22.4

a (Cc) + ni p + D - (On) -H2I

five

0

five

0

five

0

five

0

five

where (On) is the total hydrogen content in the fuel blown into the horn,%:

a - the ratio of the mass fractions of hydrogen and carbon in coke.

For comparability of the values (Osh) | / (Cc) | with ore load use the following formula:

 , (Osh) | . PI - p

V-UIJI

3 - l. and I THAT

where ft is the design ore load in zone I, t / t;

And - proportionality coefficient;

(USA) is the amount of gasified coke carbon for the furnace as a whole, kg per 100 m of flue gas;

(Osh) is the amount of gasified oxygen of the charge for the furnace as a whole, kg per 100 m of dry flue gas.

p is the ore load for the furnace as a whole, t / t.

The indicator (Osh) / (SS) takes into account the effect on the composition of the gas in the furnace of injection into the furnace of additional fuel and enrichment with oxygen, as well as the development of gasification processes along the furnace radius and characterizes the ore load in the controlled annular cross-section of the furnace.

PRI me R. On blast furnace No. 5 CherMK with a volume of 5500 m3, equipped with a conical charging device with a chute charge distributor by statistical processing of the furnace operation parameters, the optimum distribution of the ratio (Osh) / (Sf) along the radius in the upper part of the mine, given in Table 1, was found.

This optimal distribution of the ratio (Osh) | / (Cr) (corresponds to the following operating conditions of the furnace: the oxygen content in the blast is 23-24%, the consumption of natural gas is 30000-32000 m / h, the proportion of pellets in the charge is 30-35%.

In the period of 11–25 December 1987, the following distribution of the values of the ratio (Osh) / (Cc) along the radius of the upper part

mines (averaged over the period values) given in table 2.

There was a sharp decrease in the indicator (Oui) i / (Cu)) i in the axial zone of the furnace (by 0.20-0.25 at points located 4.17 and 5.86 m from the laying) with a slight increase at the periphery ( 0.11 from the clutch).

In the considered period of 11-25.12.87, a blast furnace system was used at the blast furnace, consisting of 7 feeds, including coke (K) and iron ore (P) portions, loaded at different positions of the rotating tray (figures in brackets ): 1. K (8-4), P (8-5). 2. To (9-5), P (9-4). 3. To (5-2), P (9-4). 4. K (9-5), P (9-5). 5. K (8-5), P (9-5). 6 K (9-5), P (8-5). 7. To (7-3). P (9-5).

The position of the tray corresponds to the following corners of the working surface of the tray relative to the furnace axis: 1. - 5.1 °. 2. - 16.8 °, 3. - 24.7 °, 4. - 29.1 °. 5. - 32.0 °, 6. - 34.7 °, 7. - 37.7i, 8.-39.8. 9.-42.2 °.

Due to the fact that over the period of 11 - 25.12.87, the furnace was a significant difference from the optimal distribution of the indicator (Osh) | / (S) along the radius, and especially in the axial zone, the loading mode was changed. A cyclic system was used, consisting of 7 innings, including coke (K) and iron ore (P) portions, but the latter were loaded at varying angular positions of the rotating tray: 1. K (8-4), P (8-4), 2. To (9-5), P (8-3). 3. To (5-2). P (9-4). 4. K (9-5, P (8-4). 5. K (8-5). P (9-4). 6. K (9-5), P (8-4). 7. K (7-3), P (8-3).

In the modified system, the angular positions of the tray were selected so as to displace the loading of iron ore materials from the peripheral to the axial zone. With a constant number of positions of the tray for coke portions, when loading the iron ore part of the charge (sinter and pellets), the number of positions in the axial zone was increased (by 2 positions in the position of tray 2 and by 5 positions in position 3) and the number by - Positions at the periphery (3 positions in the position of tray 9). As a result, the following new radius distribution is obtained (0W) | / (USA) | (average for the period 12.26.87 - 01.01.88), given in table 3.

A comparison of the obtained distribution of the ratio (Osh) | / (Cf) 1 with the optimum indicates that the distribution of the gases has improved and is closer to the optimum for given operating conditions of the furnace. As a result, the use of chemical and heat energy of gases increased and the technical and economic indicators of smelting improved.

- specific coke consumption decreased by 1.2 kg / t of pig iron and the productivity of the blast furnace increased by 41 tons / day.

Changes in performance d.p.5 CherMK with regulation in relation to (0 Ш) | / (СШ) | given in table 4.

With a significant deviation of the distribution of the magnitude (Osh) | / (Cm) | From the optimal, especially in the axial zone of the furnace, the distribution of C02 along the radius of the upper part of the shaft, which is usually the basis for controlling the distribution of materials and gases, has not changed much. The content of C02 in the axial zone in the period 11-25.12.87 decreased from 0.6 to 0.3%. Such a slight change in the C02 content is attributed to the high gas temperatures (up to 1200 ° C), which are constantly maintained in the central part of the furnace shaft.

Table 5 shows other examples of regulation in terms of (Om) i / (Cui) i B CWMC blast furnaces.

The advantage of the proposed method of controlling and regulating the distribution of materials and gas flow is a higher accuracy of control and more efficient regulation of the distribution of materials across the furnace cross section, ensuring high performance of the blast furnace with a minimum specific fuel consumption.

The advantages of the method are especially significant when it is used for maintaining large-volume blast furnaces, where special demands are placed on loading the central zone, since overloading this part of the furnace with iron ore materials can lead to a serious breakdown of the furnace.

Claims (1)

Invention Formula The method of controlling and regulating the distribution of materials and gases over the cross section of a blast furnace, including monitoring the gas composition along the radii in the upper part of the mine and the parameters of blowing, controlling the distribution of the ore load along the throat radius, characterized in that. in order to increase the productivity of the blast furnace and reduce the specific consumption of coke by improving the energy use of the gas flow, the optimum values for the existing conditions of smelting and the current ratios of the quantities of gasified oxygen and carbon of the charge over the furnace radius are determined, and the ore load distribution is controlled at a radius of deviations of the current values of these ratios from the optimal ones by 0.1-0.3. Indicators Productivity (good), t / day Coke consumption (dry), kg / t of pig iron Consumption of natural gas, ml / t of pig iron Mass fraction of iron in metal, g Slag yield, yr / t pig iron Mass fraction of oxygen in the blast, 7. Temperature to blow  with Gachov pressure under the wheel track, NPA Carbon oxide utilization rate, z45.5 Head gas temperature, С262 Protptei, 2Silent Turn, X Numerator - reported data, denominator - accounted to the same conditions. Table 1 Table 2 Table3 T a O l and c s 4 Period 12.26.87 - 8.01.S3 g. Optimal distribution (rw 11199 11144 444 .0 444.1 81, 4 58.45 29S 24.4 1229 0.22 46.3 233 0.60 0.30 55001.0-1.10.5-0.6 55001.0-1.1 0.5-0.6 2758 2713 4387 288V 2837 4553 11810 11537 1132h 11838 11465 11815 Table 5 System zlgruehn Alshlakshklak Changes in the composition of 1.01-0.6 charge, blowing mode, discharge mode The same, as well as the re-1.05 0.58 mount device Continuation of table.5 4J 4J5 42 / 420 430 419 450 459 541 450 457 449