SU1229228A1 - Blast furnace tuyere - Google Patents

Description

The invention relates to ferrous metallurgy, in particular blast furnace tuyeres used to deliver hot blast and gaseous fuels to a blast furnace.

The purpose of the invention is to reduce the consumption of coke by improving, mixing the gas with the blast stream.

Installing the end of the gas supply tube in the outlet of the bypass chamber allows a part of the flow to be blown due to ejection and dynamic pressure to blow into the bypass chamber and thereby obtain a stream of gases with higher kinetic energy than the known tuyere at the outlet of the bypass chamber that provides a deeper introduction of gas into the main flow is blowing and ultimately leads to an increase in the quality of gas mixing with the blowing flow.

To achieve maximum efficiency, the ratio of the distance (fj,) between the outlet openings of the overflow chamber and the gas supplying tube to the diameter of the outlet opening of the gas supplying tube (d) should be 2-3, and the diameter of the outlet opening of the overflow chamber (d) should be about three times the diameter of the gas outlet tube. With, a part of the bypass chamber located at a distance of 3 d (and further from the end of the gas supplying tube, works as a mixing chamber with all the ensuing negative consequences.

Editor N. Yatsola Order 2419/22

S a s t av el et A., Ashihi and

Tehred N. Bonkalo Proofreader A. Zimokosov

Circulation 552 Podggy

VNIIPI USSR State Committee

for inventions and discoveries 3035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Design, 4.

With

2d effect decreases

ejection and, as a result, the kinetic energy of the gas flow decreases, and hence the quality of mixing.

The drawing shows a tuyere longitudinal section.

The lance contains a water-cooled body of the outer 1, the inner 2 glasses and the flange 3. On the inner glass 2, a bypass chamber 5 is installed. Through the water-cooled. the casing and the outlet end of the overflow chamber have passed a pipe 4 for introducing gaseous fuel, the outlet end of which is open into the working channel 6 of the tuyere.

The lance works as follows.

The flow of hot blowing moves through the working channel 6 of the tuyere, and the flow of the additive through the tube 4. When the flow is moving, part of it blows into chamber 5 due to the dynamic head blowing and the ejection effect created by the flow of the additive. As a result, a combined stream is formed at the exit of the bypass chamber, which is introduced into the main stream.

blow and mix with it. Since the combined flow has a much greater kinetic energy, this provides it with a deeper implant into the flow to blow and, as a result, an increase in the quality of mixing with it.

Improving the quality of mixing helps to improve the use of a fuel additive in a blast furnace.

Claims (1)

A blast furnace lance containing a water-cooled casing with a flange, an annular bypass chamber located in the cavity of the casing, communicated by the inlet and outlet from -, was characterized in that, in order to reduce the coke consumption by improving gas mixing with the blast, the end of the gas supply pipe is apertures with a blast channel, and placed inside the bypass chamber, a gas supply tube with current is installed concentrically in the outlet of the bypass chamber, the ratio of the distance from the outlet of the bypass chamber to the outlet -stand holes of gas feed tube to the diameter of the outlet gas feed tube is 2-3, and the diameter of the outlet of the bypass chamber is equal to three diameters of the outlet tube leading gazopod. 1229228 A1