SU949004A1 - Blasting tuyere of blast furnace - Google Patents

Description

(54) BOTTOM FURM DOMAIN FURNACE

The invention relates to metallurgy and can be used in shaft-type furnaces, for example, valuable ones. Closest to the invention by technical essence and the cognizable result is an Outian blast furnace tuyere containing a hollow body, a flange located in a cavity of a hollow ring formed by an ovum concentrically arranged shells with through holes and ceilings opposite to the flange of the ring with holes fl . With this design, the Oonaco, which enters the cooled cavity of the tuyere, is directed in a continuous flow to the end wall, spreads along it, and then goes towards the direction of walls, through the hole in which earrings in the back of the tuyere rubbing out. Progressing in this way in a continuous flow, the thief bathes the inner surface of the tuyere body, cooling it through its heating of the temperature well below the boiling point. Such a lance does not allow turbulence in the flow of heat at the cooled wall without increasing its circulation ratio. Moreover, the multiplicity of circulation, which provides the necessary rate of flow in a stream, ensuring that the parse film is removed from the cooled surface of the tuyere stack, which is heat-resistant, is practically unattainable. As a matter of fact, this 4Perm1 connection does not allow its reliable cooling in a vapor-steam mode. At the same time, the structural design does not ensure uniformity of water droplets on the surface of the tuyere cooling. The purpose of the invention is to increase the resistance of the blast furnace tuyere. The goal is achieved by the fact that in an Outian tuyere containing a hollow body there is a flange located in the cavity of a hollow ring formed by two concentrically located shells made

with a cKBoaiibiN-Tif ogreplen III and a cross-section with openings covered by a cross-section with openings, the outer shell of the hollow Kajet is equipped with a screw with a step of 0.25-5.0 diameters of the ring, while the interstitial wall 4urmy and naklokoi clearance, composition of 10-50% of the gap between the cooled surface and the outer shell.

The drawing shows the device,

The cocTOtiT device is from a housing containing outer 1, inner 2, face 3, and I will fill 4 ste5-1ki. All these walls form a cavity inside which there is a vtsonapornaya shell 5 (hollow ring), consisting of two shells (pipes): outer 6 and one-thirds 7. On the front side, these pipes are blocked by a transverse ring wall 8, which is cross-section along Sh1 of diameter preferably, it has the shape of a gutter. This transverse annular wall 8, as well as the walls of pipes 6 and 7, is made with through-passive openings 9, the axes of these holes in pipes 6 and 7 are located either in the optical planes of these pipes, or by an acute angle to these planes in the transverse wall 8 of the axis of the thulverization of cyal holes 9 is located 1 along the normal -. The pulverized openings 9 are located at a predetermined interval over the entire area of the pipe walls. Osobeshu. The size and spacing of the spraying openings 9 are carefully selected, located on the section of the transverse wall 8 and suitable for irrigation of the lance of the end wall 3 of the tuyere, which here is subjected to the greatest heat dissipation. Spreading relative to each other and the diameter of spraying of the 9 holes in each section will fall into each other. Considering the fact that the spraying of the gullet of the water streams should irrigate practically the entire internal ticeepx of the cooled body wall of the truck, In addition, the kinetic energy of each jet should be sufficient Accurate to overcome the resistance of the flow of free-flowing steam on its surface: a cooled surface. The optimal values of these parameters are chosen experimentally depending on the specific

conditions of tuyeres, its dimensions and external configuration.

The total area of all spraying openings is such that

so that the NUMOIO passes through them with a maximum jet speed (with a given pressure drop in the water-pressure shell and in the steam cavity of the neck cavity formed by stesa 1 and pipe b, as well as wall 2 and pipe 7) the required amount of WATER to ensure the cooling of the outer surface of the tuyere by converting this water into steam. The required amount of water is determined on the basis of the maximum value of the heat supply pipe. which ejects during operation and the temperature of the outer surface of the tuyere and its dimensions. These calculations are carried out according to a well-known technique widely used in tepigotechnology; and then specified and corrected by experienced lances,

The discharge shell, consisting of pipes 6 and 7, is tightly connected to the drainage pipe 10-, which can also be located inside the steam outlet pipe 11, also tightly combined with the vapor outlet cavity through the holes in the rear wall 4. If necessary, the steam discharge pipes 11 maybe two or more. They can be located both symmetrically around the circumference of the back wall of the 4th form, or asymmetrically on one side. The efficiency of cooling the tuyere due to the uniform supply of water droplets to its cooling surface is ensured by making a screw lining 12 in the outer casing (pipe 6) of the water-pressure shell (hollow ring) into the outer shell. In this case, the waste steam is removed from the annulus; the hollow ring enclosed by the cooled surface and the outer tube, not directly along the axis of the truck, but along the screw inter-pipe chute. Considering that the jet of waste steam moves at a significant linear speed, it can be expected that a significant amount of centrifugal force acts on this steam flow. Under the action of the latter, water droplets contained in this stream are thrown onto the cooled surface of the outer (conical) wall of the tuyere. Ultimately, the swirling of the vapor flow leads to an even distribution of the cooled liquid on the inner surface of the cooled wall, and besides

Claims (2)

At a lower temperature of the latter, a higher degree of dryness of the outgoing steam and, consequently, less effective cooling water consumption will be achieved. Vintsya nakoka 12 can be made of a metal strip or made of a bar of the corresponding diameter. Moreover, the width of this strip or the diameter of the bar should cover from 5O to 9O% of the thickness of the annular gap, 1OO% overlap of the gap affects the cooling of the pipe sections in contact with the strip or bar, due to the absence of contact of these areas with water drops, and the overlap This gap, less than 50% of its width, according to calculations, sharply worsens the conditions of swirling of the vapor flow, and consequently, its effect on the cooling of the tuyere. The screw strip or screw bar is secured to the outer tube of the hollow ring by welding. The optimum pitch of the screw lining is chosen experimentally in the range from 0.25 of the outer diameter of the hollow ring of the tuyere to several of its diameters. The pitch size depends mainly on the thermal stress experienced by the tuyere and its dimensions (diameter and width of the annular space). The lance works as follows. Before entering the working space of the furnace, water is supplied to it, which, having passed through the water supply pipe 1O, enters the spraying orifices 9, from where it sprays on the inner surface of the end wall 3, the outer wall 1 and the inner wall 2. Having filled the annular space between wall 1 and pipe 6, as well as between walls kofi 2 and pipe 7, water leaves the tuyere through a steam pipe 11. During this period, the tuyere precipitates in the mode of ordinary water cooling. As the lance is introduced into the blast-furnace working space and the heat-surge increases, which the lance undergoes, its application is transferred to the vapor-vaporizing mode. For this purpose, the amount of water supplied in per unit of time is reduced to the value at which water completely turns into steam with given characteristics of pressure and temperature, by which they control the amount of water supplied to the cooling of the tuyere in the evaporative mode. The thermal stress experienced by the external wall of the tuyere, the amount of water required to cool it in the evaporation mode, depends on the size of the surface of the tuyere and the value of the thermal stress experienced by this surface. Knowing these values, as well as taking into account the permissible temperature of this surface, the required amount of water for evaporative cooling of the tuyere with predetermined parameters of the steam to be prepared by means of known heat engineering calculations is determined by which the flow of water for cooling is controlled. The punching essence of the construction of such a blast furnace (} urma can be used in other objects close to the design of refrigerated refrigeration (for example, a slag tuyere, tuyere and shpakovy ambraeurah, etc.). Practically, at any very high thermal stress by eliminating film boiling of water, which allows to increase its service life in comparison with tuyeres operating in the domestic hot-water cooling mode, and that Incomplete reduction & leads to a reduction in simple blast furnace for replacing tuyeres with an increase in its productivity and simplification and cheapening of its maintenance while reducing water consumption for cooling. Dutev 4 Invention blast furnace containing a hollow body, a flange located in a hollow ring cavity, formed by two concentrically located shells with through holes and a cross ring with holes 5 that are blocked from the side opposite to the flange, characterized in that, in order to increase its The outer shell of the hollow ring is provided with a screw lining with a clamp O, 25-5, O of the diameter of the ring, while the gap between st. 1 of the tuyere and the lining is filled with a gap, the size of which is 10-25% of the gap between the chill. surface of the tuyere and the outer side of the gull. Sources of information ,,,, taken into account in the examination I. Application of Japan No. 48-25286, p. C 21B 7/16, 1973.