SU1420027A1 - Arrangement for introducing hot blast into blast furnace - Google Patents

Abstract

The invention relates to ferrous metallurgy, in particular to the structures of air ducts for hot blast furnaces. The purpose of the invention is to increase the uniform distribution of the blow over the tuyeres and over the section of the hearth. Hot blast is fed through the direct air duct 1 to the annular air duct 2 and further to tuyere instruments 3. Due to the fact that half (ACB) of the annular air duct 2, opposite to the connection of the air ducts 1 and 2, are made with internal nozzles with differentiated projections of the latter in the inner part of the air duct 2 so that the nozzle, diametrically opposed to the connection of the air ducts 1 and 2, is made with a maximum protrusion with a height equal to 0.026-0.098 of the inner diameter of the air duct, and the height of the protrusions is x - a decrease in the maximum protrusion height of 0,16-0,25, outputs the coefficients of resistances to blow out the pipeline 2 will be different, and the cost for a blast blowing circumference about the same furnace. The application of the invention will, by increasing the uniformity of blowing blast furnace tuyeres, ensure the equality of its progress, reducing coke consumption and increasing furnace productivity. 2 ill., 1 tab. (L tsD ISD Kj

Description

The invention relates to black metal industry, in particular, to hot air blowing pipe structures e) variable furnaces.

; The purpose of the invention is to increase the uniformity of the distribution of blowing over the tuyeres and over the section of the hearth.

FIG. 1 shows an input device for hot blowing into a blast furnace, li of a horizontal plane; 2, in the vertical plane. I A hot air blowing device for a blast furnace consists of direct air; i y of conductor 1 and annular air duct 2, tuyere assemblies 3. The upper part of the annular air duct 2 is the positive connection of the latter with the air duct 1 relative to the central The axis (AB) of the annular air duct 2 is made with internal nozzles 4, connected by means of instrumentation 3, and the internal nozzle 4 diametrically opposite to the junction of the direct air duct 1 and the annular air duct 2, is made with a maximum protrusion on the inside of the pipeline with a height equal to 0,026-0,098 its inner diameter, and the remaining protrusion is configured to decrease the maximum protrusion height of 0,16-0,25. The nozzles 4 are made of a highly refractory wear-resistant material. The curve ACB (Fig. 1) annular air duct 2 is made with internal 10

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Nozzles 4. At point C, internal nozzle 4 has a maximum protrusion, while the protrusions of the others are reduced so that at points A and B, internal nozzles 4 have a minimum height.

Typically, the flow rate to blow. At point C of the annular air duct 2 is more flow rate to blow at point D of the annular air duct by 25-30%. It is necessary to increase the coefficient of outlet resistance from the annular air duct 2 to tuyere stock 3 by this amount due to the internal nozzle. The table shows the data for calculating the height of the internal nozzle at point C of an annular air duct for blast furnaces (B and B). For example, in a blast furnace of 2,700 m, having an internal diameter of the annular air duct 2 D, 1.292 m and an internal diameter of the tuyere unit 3, 218 m, the resistance of the entrance from the annular duct 2 to the tuyere device 3 is equal to 5. Increasing this coefficient by 2S% and 30% gives the value of the coefficients, 67 and, 71 ,, for these coefficients, the ratio of the height of the required internal nozzle 4 to the internal diameter of the tuyere stock 3, respectively, is B ,, 15 and, 5, B, 0.033 m, in 0.109 m, i.e. maximum height of the internal nozzle 4 depending

20

25

thirty

35

note.) - inner diameter of the tuyere stock, m,

D, is the internal diameter of the annular air duct, m,

K - input resistance coefficient tuyere device,

K - coefficient of resistance of the passage to the internal nozzles, subject to its increase, - coefficient of resistance to the entrance to the internal nozzles, provided it is increased. - the height of the internal nozzle of the connecting point of the direct and ring air.

B1 is the height of the internal nozzle of the oppoetitous junction of direct and ring air, the number of air tuyeres,

GV, and the magnitude of the decrease in the internal nozzles to the left and to the right of the maximum, n.

from the flow difference, the blow at points C and D of the ring can vary from 0.033 m to 0.109 m (33-109 mm). Similar calculations are made for other furnaces.

The magnitude of the reduction in protrusions of the remaining internal nozzles 4 is determined depending on the number of tuyere stock 3 by 1/4 of the annular air duct, by dividing the maximum height of the protrusion nozzle 4 by this quantity. For our example B, 0.033 mi B- 0.109 m, the number of tuyere devices 3 per 4 of the ring one is 6, then the decrease value of each internal nozzle 4 to the left and to the right of the maximum nozzle 4 at the point. C equals / jB, 0.0055 m and 0.0182 m.

The input device that blows into the blast furnace works as follows.

Hot blast is fed through the direct air duct 1 to the annular air duct 2 and further to tuyere instruments 3. Due to the fact that half (ACB) of the annular air duct 2 is made with internal nozzles with differentiable protrusions of the latter into the inner part of the air duct 3, the drag coefficients the outlets blowing from the annular air duct 2 will be different, and the costs

ei on 2SZ from K. nor on 30Z from K. chvrovodov at KI, m, pipelines at Kg, m.

five

blowing around the circumference of the blast furnace through tuyere instruments 3 will be about the same.

The present invention makes it possible to increase the uniformity of distribution of blowing over the tuyeres of the blast furnace and over the horn section, which ensures Q evenness of its progress, a decrease in the specific coke consumption and an increase in the productivity of the furnace.

 invention formula

An input device is hot to blow into the blast furnace containing direct and annular air ducts, tuyere instruments, characterized in that, in order to increase the uniform distribution, to blow along tuyeres and over the cross section of the hearth by changing the hydraulic resistance of the outlet ducts of the annular air duct, half the annular the duct, opposite to the connection with the straight duct, is made with. internal nozzles connected to the tuyere devices, and the internal nozzle, diametrically opposite to the connection of the air ducts, is made with a maximum protrusion into the internal part of the air duct. water with a height equal to 0,026-0,098 of its internal diameter, and the protrusions of the rest - with a decrease by 0.16 S 0.25 of the height of the maximum protrusion.

0

five

0

FIG. 2

Claims (1)

^ Claims A device for introducing hot blast into a blast furnace containing direct and annular air ducts, tuyere devices, characterized in that, in order to increase the uniformity of the distribution of blast along the tuyeres 20 and along the cross section of the furnace by changing the hydraulic resistance of the output channels of the ring air duct, half of the ring air duct2 ₅ water opposite to the connection with a direct air duct, made with. internal nozzles connected to the tuyere devices, the internal nozzle diametrically opposite to the air duct 30 dow, made with a maximum protrusion into the inner part of the air duct with a height equal to 0.026-0.098 of its internal diameter, and the protrusions of the rest with a decrease of 0.1635 0, 25 heights of maximum protrusion. 0.22 0.22 0,098 0,0263 0,030 0.0071 0.105 0.20 0.20 0,094 0,029 0.105 0.5 0.5 0.0064 0.5 0.105 0.0064 0.0210 0.0210 0,029 0,096 0.20 0.20 0.5 0.105 0.0064 0.0210 0,029 0,096 0.20 0.20 0.5 0.105 ' 0.0064 0.0210 0,029 0,096 0.20 0.20 0.5 0.109 0.0055 0.0182 0,026 0,084 0.16 0.1 ения 252 from K. ния 302 from K. pipelines at K · ,, and pipelines at K _g , m