SU949007A1 - Pipe with lateral gas admission - Google Patents

Description

(54) NOZZLE WITH SIDE GAS SUPPLY

The invention is refractory to metallurgy, where the transfer of high-temperature aggressive Zitsky aggressive srets with side gas supply, especially for the process of circulation evacuation of steel. A known apparatus for circulating evacuation with raaatl inlet. The drawback of the device lies in the strong vi3Hoce lining in the area of the feed node. The closest in technical essence and the achieved result to the invention is a branch pipe with side gas supply, mainly for installation of circulation evacuation of steel, containing a lined frame and embedded C2 gas inlet tubes. However, when gas is supplied through the tubes to the metal, there is a sharp increase in the volume of the gas-metal mixture and, therefore, an abrupt increase in the horizontal component of the rate of its ovification in the area of the gas inlet. This increase in speed leads to the premature wear of this part of the sleeve and its removal from, for example, circulation, installation in the case. In this case, the main role in reducing the durability of the lining is played by the process of smearing of the first melted, smooth layers, then the wear increases dramatically due to simple chipping of ceramics. In addition, the cylindrical shape of the inner liner of the nozzle is a significant resistance to the movement of the metal, since the gas introduced creates, due to its expansion, a force that acts against the flow of the metal. This leads, for example, to an increase in the processing time of the metal by the circulation method. The purpose of the invention is to increase the resistance of the fugershka and reduce the time of the vacuum process. This goal is achieved by the fact that in a branch pipe with side gas supply, mainly for circulator installations, iMomioro BaKy Mvrponf.iK.iH is steeple ;. contain footer tx; Tor and pstroppies: n it. gas cylinder dl gas inlet, pa (tp / t-ramp the nozzle surface in the mosque of the gas tube is made., viutrop; surface of the body of rotation.

PricheChe cross section of DbievsKH can be determined by the formula

cross-section

where

5D is the cross-section of the pipe outside the gas inlet region,

B - height Bbrewifflj m,

K is a coefficient equal to the class of the BbieMJa-is part; :; above gas level

and. 1,4,0 for recess, located ypoBfiSt vvoyaaaaz - i.

vn

In addition, at the level of the inlet gas, the notches can be spherical in shape with a radius of 3–6 times the radius of the tube.

The essence of the invention lies in the fact that the cross section of the pipe in the area of the gas inlet is to be such that it increases the metal and gas mixture in all cross sections and is identical over the entire height of the sleeve and thus provides a degree of 5: lining wasp all over the shaft. nozzle,

It is known that the rate of ovification of the melt and gas-metal mixture is 1.2 and 2.4 m / s, respectively. At the same time, the initial velocity of the aircraft of the gas-metal mixture is exactly 1.25 m / s at the level of the gas inlet gas, and the speed of the metal is 0.6 m / s, Togts is the shape of the pipe in the area of the gas node of the gas mill 1.254. 1 .ttT & -E t i; a; .- i iBu; iEifi i p: o i 3 j “, lsr,. d, MM470450416

1; g # 1p sratt;: 11-utt-ejiu (b.t

The calculations were carried out at the indicated velocities x and with the nozzle diameter outside the gas inlet region of 330 mm. But, at the input level of the iraepTHoro gas gas of such a profile, i.e. there is a sharp angle

izmonei Hfi 1) T) Ezke, g / t beg; - la cp of the end of which the speed increases from 1.2. co .2x1 m / s. Since the change in the velocity pr liCXomiT zp by the force of gravity, then the length of this segment is calculated by the form

 -w

CM SI

- hksaksimal1t. NIA speed of sv-z s-} and gas-meter of l.hv1 chen mixture, i-.f / Cj

iJ

. initial velocity of the SMVNTS mixture, m / s;

 Accerenis smpa g zhesti. m / s

%

, 1I gas mixture (v, / |

/. ka

The order of this, that there was no aavloni of the wall of the pipe, its n, o, |

h /

Cm

JU

(2)

um nojiyd d

(3)

Cln

- pipe diameter outside paftoisa

gas cut-off unit, MS d - cutout diameter in the area of

la vvooa gas, m,

1 In a way, it provokes the calculation of diameters for the extraction of the gas at the end of a gas, while the gas-engine speeds are shown. Table 2

Claims (2)

in the lining, the wedging stresses start to act due to l of the surface tension and due to the increase in the volume of gas bubbles with increasing temperature. At the same time, the radius of rounding of the tallic mixture is replaced by those of the metal, Result of calculation of U (of BbfeMk above and 1-tzhe level of va-aaaj for example when evacuating from Gyrgceney, respectively, in the tabl. 1 and 2 „Table 380 OLA of this case should obey the equation pcsyTifiH j. 1 Jfrd. roe p. - metal density, g / cm; R is the rounding radius, cm; T - metal temperature, K; T., is the temperature of normal conditions K; G is the rationus of the OLA tube of the secondary gas, cm; O is the surface tension of the metal, erg / cm. At the same time, the radius of rounding, 0 cm with a ratius of 3 mm tube. The ratio of ranius increases with decreasing tube radius, but for technological reasons it can not be more than 6, FIG. 1 shows a device that is common; in fig. 2 — node T in FIG. 1; Nozzle 1 with a side gas pinch contains a metal core 2, on the inner side of which there is a high-alumina refractory lining 3, the outer part of the skeleton 2 is lined, preferably with low-alumina ceramics 4, for the second gas in metal lining 3 and 4 there is at least one hole 5 and at least a normal metal tube 6. The nozzle has a notch 7 in the area of the inlet gas, the profile of which is higher and the level of the nozzles of the gas and obeys the equations from 1 ° 4. The device for example with a circus setup The steel vacuum degassing works as follows. A bucket with 20KhNZA steel with a capacity of 12O t is lifted by a hydraulic lift, which causes the arms of the circulation chamber to enter the metal at a depth of 200 mm. The flow rate of argon supplied to the suction hose is set to 2OO l / min. Then a steam jet pump is turned on and a discharge of 0.5–5 mm Hg is created in the chamber. while the metal from the ladle rises through the nozzles into the vacuum vessel. After 1-2 minutes, the argon flow rate is increased to 500 l / min and the melt is treated with a vacuum for 20 minutes. The metal in this case is understood by the suction hose and goes back into the bucket along the drain. At the same time, it passes through the area of inert gas. The argshnogo profile is designed in such a way that, despite abrupt changes in velocity in the area of gas injection, the metal pressure on the arm walls remains constant along the entire height of the sleeve. Owing to this wear of the lining, the entire length of the sleeve is the same. After 2O min. Vacuuming, the pressure is reduced by the ra:; hoa argon at 2OO l / min, the pump is switched off, the pressure in the Kgamer is increased to atmospheric pressure. Further in the chamber include heating, and the ladle with steel is taken to the casting. Due to this shape of the nozzle in the area of the INPUT gas, with the circulation method of metal processing, the resistance of the injected water is increased by 1.5–2 times and the melt processing direction of the melt by vacuum is reduced by 10%. The economic effect is about 2 thousand rubles per year. Claims 1. Gas pipes with lateral gas supply, mainly for installations for circulating vacuuming of steel, containing (lined core and gas injection tubes embedded in it, characterized in that, in order to increase durability ({wipe and shorten the time of the vacuum process, The inner surface of the pipe at the point of entry of the gas tubes is a hollow, the inner surface of which has the shape of a body of rotation. 2. The pipes under item 1, characterized in that the cross section of the notch is determined by the formula ql-si, where 5 - cross section of the recess m, SQ - cross section of the pipe outside the gas inlet area, m h - notch height, m; K - coefficient of 3.45 for the cylinder located above the gas inlet level and 14, O of the well located below the input level gas- -. 3.Subsubs according to claim 1 and 2, characterized in that, at the gas intake level, the recess is made spherical with a radius of 3-6 times the radius of the tube for gas generation. Sources of information 1 taken into account in examination 1 . USSR author's certificate M "345210, cl. C 21 C 7/10, 1972. 2. The patent of Germany N 1098971, cl. 18 to 7/06, 1967.. FIG. 2