SU1217881A1 - Blast furnace blowing for tuyere - Google Patents

Description

The invention relates to ferrous metallurgy and serves to supply gas and gaseous fuel to the horn by the Blast Furnace.

The aim of the invention is to improve the reliability of the tuyere and increase the degree of mixing of the gaseous fuel and to blow, more uniform distribution of the hydrocarbon gaseous fuels.

The drawing shows a lance, a longitudinal section.

The blast tuyere of the blast furnace contains a hollow water-cooled body 1 consisting of an outer 2 and inner 3 glasses, a flange 4 and a small part 5, and a gas supplying tube 6 protruding into the working channel of the tuyere, the portion of which is provided with a nozzle 7, which at the junction with The inner cup has a guide rib 8 protruding into the water-cooled cavity of the tuyere and curved toward the gas supplying tube 6 and opposite to the flow of cooling water, and the outlet end of the gas supplying tube 6 is provided with a swirl 9.

The lance works as follows

Since the guide rib 8 protruding into the water-cooled cavity is curved toward the gas supplying nozzle and opposite to the flow of cooling water, part of the water is taken and directed into the strips of the nozzle 7, which sharply activates the cooling of the nozzle 7 protruding into the working channel e her from .progara.

The presence at the exit end of the gas supplying tube 6 of the swirler 9, made, for example, in the form of a swirler of tangential or blade type, when the gas-collecting fuel is supplied, causes it to rotate when blown out. A rotating jet of gaseous fuel has a greater opening angle than with outflow of gaseous fuel without rotation, which leads to a sharp increase in the cross-sectional area of the working channel of the tuyere, blocked by a gas jet and dispersed into the blast. In addition, a reverse flow zone is formed along the axis of the jet of a rotating gaseous fuel, which also contributes to the effect

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effective mixing of gaseous fuels and blowing.

It was found experimentally that the greatest degree of mixing of fuel with blast is achieved in the case when the design parameter of the twist of the swirl, characterizing the degree of curl of the gas jet, is determined by the formula n 1 - ... 6s1pU, where is the angle of inclination of the plane of the outlet of the gas supply tube to the axis tuyeres. In case of uneven distribution of hydrocarbons along the radius of the blast furnace, it is necessary to feed gaseous fuel into the axial zone of the blast stream, which ensures its even distribution over the mass of the blast and, as a consequence, along the radius of the blast furnace. As established experimentally, the supply of gaseous fuel to the axial zone of the blast flow can be carried out at a protruding tube of O, -3-0.5 of the diameter of the working channel of the tuyere, and the sinus of the angle of inclination of the plane of the outlet of the gas-supplying tube facing the flow blow, to the axis of the tuyere should be equal to twice the ratio of the magnitude of the protruding part of the gas supplying tube to the diameter of the working channel of the tuyere. When the protruding part of the gas supplying tube is less than 0.3 times the diameter of the working channel of the tuyere, the gaseous fuel is distributed closer to the top wall of the tuyere, and the protruding part of the gas supplying pipe is more than 0.5 of the diameter of the working channel of the tuyere

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as to the value - 0.7 (H - length i

D - diameter) there is a change in the efficiency of fuel supply to the axial zone in the reverse order, however, the heat losses for cooling the protruding nozzle 7 and its resistance to flow to blow increase. Thus, the optimum of H is within (0.3-0.5) 0 when the angle of inclination of the plane of the outlet of the gas supplying tube, facing the flow to blow, to the axis of the tuyere 37-90, respectively. .

The resistance of the tuyeres is increased 4.6 times in comparison with the prototype, and the degree of mixing of the gaseous

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fuel with blast is 76-8T lei according to the distribution of hydrogen at 38-40% of the prototype. With a furnace radius that leads to an increase in H (0.3-0.5) D and sin (0.3-0.5), the degree of its use can achieve the best performance and economy of coke.

Claims (2)

1. BLAST FURNACE FOR THE BLAST FURNACE, comprising a housing consisting of an outer and inner cup, a flange and a snout, a gas supply tube placed in a water-cooled cavity and protruding into the working channel of the tuyere with a nozzle hermetically connected to the end of the tube along the perimeter and with an inner glass with an opening around the perimeter of the nozzle, characterized in that, in order to increase the reliability of the lance and increase the degree of mixing of gaseous fuel and blast, the nozzle is equipped with a guide rib at the junction with the inner glass Protruding into the cavity a water-cooled lance and curved toward gazolodvodyaschey tube upstream of the cooling water and the outlet end of the tube is provided with swirler design parameter twist n = 1 + 6sin Y, where the angle of inclination of the outlet plane of the gas feed tube to the lance axis. 2. Furma pop. 1, characterized in that, in order to more evenly distribute the hydrocarbons of the gaseous fuel, the size of the protruding part of the gas supply tube is 0.3-0.5 of the diameter of the working channel of the lance, and sin T is equal to '? twice the ratio of the size of the protruding part of the tube to the diameter of the lance channel. , _M SU „1217881