SU1089142A1 - Tuyere - Google Patents

Abstract

A furma containing external cooled air, a central gas supply pipe, a head with nozzles and flat radial partitions, characterized in that. in order to increase durability and reduce labor intensity of manufacture, it is additionally equipped with arc and cylindrical inserts located between the casing and the gas supply pipe, the radial partitions freely installed relative to the casing, the lower section of the cylindrical insert is installed with a gap relative to the internal surface of the head face, the upper section is connected with the lower sections of the arc inserts, and the ratio of the outer diameter and the height of the cylindrical insert to the inner diameter i of the tuyere casing is 0, 8-0.9 and 1-2 W respectively. about x s5

Description

The invention relates to auxiliary devices — tuyeres for introducing gases and solid materials suspended in them into metal and slag melts and can be used in steel-smelting units with an oxygen bath blowing and blowing slag-forming, oxidizing and carburizing tanks into the bath for blowing metal in ladles, in blast furnaces, as a tuyere for supplying blowing, in the processes of pyrometallurgical processing of slags of non-ferrous metallurgy. A known lance for blowing metal, containing a pipe for supplying oxidizing gas, concentric pipes for supplying and discharging cooling water, connected to a head having a joint and a guide for attaching water to the central part of the head lj . In the center of the guide pad, there is a hole for the passage of water by means of an inlet section equal to the flow area of the supply line and the guide liner and the bottom of the head form a channel whose flow area in the guide is equal to the cross section of the hole. However, this lance is characterized by an increased consumption of metal and laboriousness in manufacturing. The additional separator pipe is metal consuming head and a large number of welded joints significantly increase the weight of the tuyere. A guide for such a structure for the passage of water in the center gives a low water velocity at the exit from it and forms stagnant zones and evaporation centers in the head and throughout the tuyere, therefore these tuyeres have an increased water consumption, significant energy costs and, as a rule, low durability Closest to the one proposed is a lance containing external cooling of the casing, a central gas supply pipe, a head with nozzles and flat radial partitions. 2 The disadvantage of the known lance is low durability. copulating lack of compensation of alternating thermal stresses in the rigid welded structure, consisting of a cooled shroud, the gas supply conduit and located between them do flat radial partitions. Welding the casing with flat partitions complicates the manufacture of the tuyere, as it requires either pre-splitting the casing into two longitudinal parts and then welding them to the partitions, or using special welding methods, such as electro-beam, that are not yet widely used. The guide ribs can only in some cases give parallelism to the movement of the flow of cooling water in the head, for example, for one, two or four tufts. In compact heads with an odd number of nozzles or the number of nozzles larger than 4, parallel guide edges cannot be installed, since adjacent nozzles interfere with this. Increasing the gaps between the nozzles will lead to an increase in the diameter of the die and the tuyere itself and to the unnecessary waste of materials for the manufacture of the tuyere, the consumption of water for its cooling and the loss of heat from the cooling water. The purpose of the invention is to increase the durability and reduce the complexity of manufacturing the tuyere. This goal is achieved by the fact that in a tuyere containing an outer cooled jacket, a central gas supply pipe, a head with nozzles and flat radial partitions are additionally equipped with arc and cylindrical inserts located between the casing and the gas supply pipe, the radial partitions being freely installed relative to the casing, the lower cut of the cylindrical insert is installed with a gap relative to the inner surface of the head end, the upper cut is connected to the lower sections of the arc inserts, and the ratio Outer diameter and height of the cylindrical insert to the inside diameter of the lance casing is equal to 0.8-0.9 and 1-2, respectively. FIG. 1 shows the proposed tuyere, longitudinal section; FIG. 2, section A-A in FIG. 1 in FIG. 3 section bb in fig. 2, in FIG. 4 shows a section B-B in FIG. 2. The lance contains a concentrically arranged outer cooling jacket 1 and a pipe 2 for supplying an oxidizing gas. The output ends of the casing 1 and the pipe 2 are rigidly attached around the circumference of the head 3 with nozzles. With the outer surface of the pipe 2 along the entire length of the tuyere flat radial partitions 4 and 5 are rigidly connected along the entire length with the inner surface of the casing 1. The casing 1, pipe 2, partitions 4 and 5 o. Formed cooling slots. The lower bases of the partitions 4 and 5 are made with sharp corners at the apex, to which the arc inserts 6 and 7 are attached by ends. A cylindrical insert 8 is attached to the latter, the tube 2 and the casing 1 are aligned with the method. The lower section of the cylindrical insert 8 has an inner surface of the head form a gap for draining water. Arc inserts 6 and 7 have the form of half-rings, located at angles to the casing and pipe 2, respectively. The arc insert 6 is connected to the casing 1 by the upper cut, and the lower cut to the cylindrical insert 8 to which the lower cut of the insert 7 is attached, and its upper cut is attached to the pipe 2. The arc insert 7 has an outer diameter equal to the inner diameter of the insert 6 The inner diameter of the insert 7 is equal to the outer diameter of the pipe 2, and the outer diameter of the insert is equal to the inner diameter of the casing 1, therefore, the arc insert 7 is smaller, and the insert 6 is larger. The lance works as follows: To a converter or another steelmaking unit loading: the amount of solid metal slug is necessary and the amount of liquid iron is poured. Then, through the throat vertically downward, a lance is inserted inside the converter, oxygen is opened, which passes through the pipe 2 and the nozzles, blows the liquid metal. After the metal purging window is closed, oxygen is closed and the lance is removed from the converter cavity to the upper position. The cooling of the tuyere is carried out as follows. Water for cooling the tuyere is fed to one of the halves of the annular gap. 10 2 formed by the inner wall of the casing 1 and the outer pipe 2 and separated by radial partitions 4 and 5, and then it enters through a section formed by the inner side surface of the larger conical insert 6 and half of the outer surface of the pipe 2, and then goes into the concentric cavity formed by the inner the surface of the cylindrical insert 8 and the outer surface of the lower end of the pipe 2. Washing the inner surface of the head 3 with nozzles, cooling water through an annular gap formed by the outer surface of the center of cylindrical insert 8 and the inner surface of the housing 1 enters the slot formed at the outer side surface of the insertion cone 7, the inner surface of the casing 1 and the outer tube 2 and leaves the exit. The oxidizing gas is supplied through the inner cavity of the pipe 2 through the nozzles of the head 3. The flat radial partitions divide the annular gap between the outer casing and the inner bottom for supplying the gas into two parts, one of which serves to supply and the other water. Radial partitions are tightly attached to the gas supply pipe and are freely mounted relative to the inner surface of the casing, which allows the casing to move relative to the partition or periodically heat-cool it without causing significant stresses and increases the durability of the tuyere .i. The first arc insert is located at the exit from the slot for supplying cooling water to the head of the tuyere at an angle to the casing and directs the flow of water inside the cylindrical insert. The cylindrical insert stabilizes the flow of water and evenly directs it to cool the tuyere head. The second arc insert is located at an angle to the casing at the entrance to the water drain slot and ensures a smooth drainage of water from the tuyere head without the formation of stagnant zones. The even movement of the water ensures good cooling of the heading and contributes to the increase of its resistance. The cylindrical and arc inserts are lightweight, easy to manufacture and install during the assembly of the tuyere. So on the assembly of the known takes about 2 times more than the proposed, respectively, 4 hours and about 2 hours. The test results are given in table. 1 and 2. From the data table. 1 that when the ratio of the height of the cylindrical insert to the inner diameter of the casing jiL 1,5 / in table. 2 — with a ratio of the outer diameter of the cylinder insert to the inner diameter of the casing — 0.85. The difference in flow rates at the inlet and outflow of water from the lance will be 20-21 C. Moreover, from the point of view of resistance, the flow rates and pressures of cooling water are optimal for the ratio of the outer diameter of the cylindrical insert to the inner diameter of the casing in the range of 0.8 -0.9, and the ratio of the height of the insert to the inner diameter of the casing is 1m2. At f i 0.8, it greatly increases the case diameter P, the water consumption for cooling the tuyere, and the heat loss with cooling water. Due to the growth in it

0.70 0.75 0.80 I 0.85 0.9 0.95

Durability tuyere,

88 heats Water consumption for cooling the tuyere, m / h. 21.0 Heat loss with cooling water, 10 kcal / h 0.45 Water pressure loss, atm: in a lance 4.40 in the head of a lance 0.48

113 120 130 97

56 90 35.5. 0.71 3.12 0.12 The ratio of the outer diameter of the cylindrical insert to the inner diameter of the casing in the case of the dimensions of the water passages decreases its speed and deteriorates the conditions for cooling the tuyere. This is explained by the reduction in the durability of the tuyeres under these conditions. At D.0.9, the durability of the tuyere is reduced. Under these conditions, the gap for the passage of water is sharply reduced, leading to a sharp increase in water pressure and disruption of cooling conditions with a slight distortion of the tuyere. The reduction in the durability of the tuyere for 1.0 is explained by the violation of the uniform distribution of water in the head. In these cases, water cools the side of the head opposite to the slit for supplying water to the tuyere more strongly. With increasing pressure loss of water in the tuyere with almost constant resistance. U. The economic effect obtained by increasing the durability of the tuyere and reducing the labor intensity of manufacture amounted to 69.7 thousand rubles. In tab. 1 yes. The test results in table. 2 - effect of the parameters of the cylindrical rate on the resistance of the tuyere. Table 1 The proposed lance 28,423,720,317,815,8 0,570,470,410,380,32 3,363,884,505,8310,49 0,180,290,491,134,50

Known lance

Indicator Durability tuyeres, 8890 pl.

Table 2

We offer a lance

The ratio of the height of the cylindrical insert to the inner diameter of the casing

0.5 G 1.0 1 1.5 T 2.0 G 2.5

124 113120125

Claims (1)

A FURMA containing external cooled air, a central gas supply pipe, a nozzle head and flat radial partitions, in order to increase the resistance and reduce the laboriousness of manufacturing, it is additionally equipped with arc and cylindrical inserts located between the casing and the gas supply pipe, with radial the partitions are freely installed relative to the casing, the lower cut of the cylindrical insert is set with a gap relative to the inner surface of the end face of the head, the upper cut is connected to the lower cut and arc inserts, and the ratio of the outer diameter and height of the cylindrical insert to the inside diameter of the lance casing is equal to 0.8-0.9 and 1-2 I