SU986928A1 - Tuyere apparatus for blast furnace - Google Patents

Description

-. .-

The invention relates to homemade

production, in particular for the supply of blast additives through the tuyere collection in the blast furnace.

There is a known method and device for regularizing depths of dry grains .5

, blowing, in which the additional fuel is distributed through radially arranged tubes and through the fuel rail, the divider, which has a vortex nozzle, is blown into the flow

In such a device, it is possible to achieve the desired distribution results in the mixing of blast additives in the flow to blow, however, even with a brief shutdown of the blast additive that it is necessary to stop the blast furnace, the fuel distributor with the HPF element is destroyed by the high temperature of the gases.

The closest to the invention to the technical essence and the achieved results is the nozzle of the blast furnace tuyere stockpile containing the nozzle

for injection of fuel oil by the end of the nozzle, which is equipped with a distance from two to three diameters from the front end of the intermediate water-cooled superheater} drop-like shape into which the nozzle is embedded. The disadvantages of the known smsh are limiting the amount of flow of the blowing additive, especially gas , because of the small diameter of the nozzle, since with the diameter of its diameter the 1focus section of the tuyere pribr decreases; Ignition of the blast additive at the junction of the nozzle and the tuyere with the flame coming out of the tuyere device, the temperature at the junction of the nozzle with the tuyere increases, which leads to overheating of the uncooled nozzle surface and the formation of gas.

Claims (2)

The purpose of the invention is to increase the volumetric inlet of the fyod gas and prevent its excitement (fan in the place of junction t of the sieve with the tuyere. 3986 This goal is achieved by the fact that the blast furnace tuyere apparatus containing a tuyere and a nozzle with a water-cooling supply pipe the side of the furnace, the outlet of the boiler is located along the axis of the tuyere of the device, the internal area of the nozzle is 1DO-1.25 of the area of the output section of the tuyere, and the outlet of the nozzle is located from the front end This is a constructive solution that ensures a rational and stable distribution of the blowing additive in the flow to blow at different ratios of flow parameters of blowing and additives (pressure, flow rate, etc.). In addition, the necessary the number of additives in the furnace, even at a pressure equal to or lower than the pressure blown in. Fig. 1 shows a tuyere device with a section along the axis of the cooled nozzle for supplying the blowing additive; in fig. 2 is a section A-A in FIG. 1 (piping arrangement in the cooled jacket) The tuyere unit (Fig. 1) contains nozzle 1 and lance 2. A nozzle 3 bent towards the blast furnace passes through the nozzle wall, with an outlet branch {4 for blowing addition along the tuyere axis. The pipe 3 is connected to the feed additive supply pipe 5 and is protected by a cooled jacket 6, which is cooled by the supply pipe 7 and the discharge pipe 8 (Fig. 2). The internal section area of the nozzle is 1.10-1.25 area of the output section tuyeres 2, i.e. more by the size of the area occupied by the pipe 3, which is necessary to preserve the cross-sectional area of the tuyere stock. The cross-sectional area of the stream blown by the nozzle is Sn 0.5 (d + dr) do. , clf - nozzle and nozzle diameters, respectively, mm. Combustion of the additive begins at the contact boundary 50 of the opening jet of the additive with the flow blowing and extends into the flow of the additive. The position of the specified boundary depends on the place of introduction of the additive into the tuyere stockpile, parameters of the addition jet and the flow of blowing (pressure, temperature, etc.), their ratios and the angle oL to reveal the jet in tuyere 2. 84 To prevent flame from entering At the junction of the nozzle and the tuyere, the distance 6 of the plane of the outlet of the nozzle from this joint must be greater than the plane of intersection of the interface of the additive and blow with the inner surface of the tuyere. The value of 2o. (oL is the opening angle of the blast additive jet) is 25-300 for a maximum value of, c-fc ot 3.8. Thus, if the nozzle is located in the nozzle, its outlet should be no farther than 3.8 radii or 1 | 9 nozzle diameters from its front end. Consequently (taking into account a margin of 10%), the nozzle outlet must be located in the area between the nozzle front end and a plane in the nozzle, 1.7 diameters apart from its end, the co-feed of the blowing additive to the domain is carried out via pipeline 5. Fig. 3 and an opening 4 located in the cavity of the nozzle 1 at a distance of 1.7 diameters of the nozzle from its end, about provides disclosed tie the jet of additive on the carbon angle d and mixing it with the blast in the plane of the tuyere 2. -Cooling of the pipe 3 is carried out by means of a cooling jacket 6, which is washed by the refrigerant through the pressure pipe 7 and the discharge pipe 8 (Fig. 2). Blowing the gaseous blowing additive along the flow axis provides an increase in its volumetric flow rate, a high degree of mixing with the flow blowing, optimal transportation to the oxidation zone and distribution over the section of the blast furnace, which increases the use of its thermal and chemical energy. The use of the invention allows, by improving the distribution of the additives and increasing the volumetric flow rate in the stream, to obtain coke savings. The claims of the blast furnace tuyere apparatus containing a tuyere and a nozzle with a water cooling pipe for supplying a carbon-blowing blow: a pre-natal additive bent to the side of the furnace, the outlet of which is located along the axis of the tuyere unit, having a TV that is characterized in that and prevent its ignition at the junction of the nozzle with the tuyere, the area The internal cross section of the soghio is 1.10-1.25 of the area of the outlet cross section of the tuyere, and the outlet of the nozzle is located 1.7 of its internal diameter from the front end of the nozzle. Sources of information taken into account prior expert examination 1. The patent of Germany No. 2355282, cl. From 21 to 7/16, 1975, 2. Authors svdedelstvo USSR N 556178, cl. From 21 to 7/16, 1977. 53. Landau LD, / bfnits B.M. Continuum mechanics State Publishing House, Tech-and-Ortic Materials, 1954, p. 165.