SU499316A1 - Tuyere - Google Patents

Description

The invention relates to the field of ferrous metallurgy, in particular, to devices for flushing a liquid metal with an oxidizing gas.

A known lance consisting of concentrically arranged tubes forming paths for supplying and discharging water and supplying an oxidizer, a storage tank with nozzles, and an intermediate insert with a central opening located inside it.

A disadvantage of the known device is its low durability due to the presence of a steam jacket, which prevents the contact of cooling water with the heated surface.

To increase the durability of the tuyere, the central hole of the intermediate insert is made passing into a bell, coaxially with which a rotor is mounted on the sterret fixed at one end to the tip base; decreasing annular clearances.

The drawing shows the proposed lance, a longitudinal section.

The lance consists of concentrically arranged pipes forming paths 1, 2 for supplying and discharging water and path 3 for supplying

oxidizer, accumulator 4 with nozzles 5 and with intermediate insert 6 located inside with central hole a passing into socket 7. At the base of the tip the rotor 8 is rigidly fixed to the end of rod 9 coaxially with the socket so that between the inner surface 10 of the socket and the outer And the rotor surface, and just between the inner surface of the 12 rotor and

the tip of the tip 13 forms decreasing annular gaps b and c, the axes of which, after smooth mating, form a common axis. The rotor 9 is mounted on a rod with the possibility of free rotation and is equipped with

inclined grooves r, directed in one direction. The number of grooves from two to eight, the angle of inclination to the longitudinal axis of 1-5. The total area of the inclined slots of the rotor is 0.09-0.5 squares of the coronal section of the tract.

for water supply.

The flow area of the annular gap between the socket and the rotor is 0.3-0.8 at the inlet and 0.1-0.3 at the outlet of the section of the passage for the supply

water, and the flow area of the annular gap between the rotor and the inner surface of the tip end is 0.2-0.5 at the inlet and 0.05-0.15 at the exit of the flow area for supplying

water.

The device works as follows.

By: after lowering the tuyere into the working position, the oxidizing gas is supplied along the central channel 3, and the cooling water under pressure of 8-50 atm. route 1. Water is discharged in accordance with Tr Act 2.

From tract 1 cooling water through the central hole of the intermediate insert 6 enters the profile gradually decreasing to the exit (Annular gap b. Part of the cooling water enters through the inclined grooves r of the rotor 9 into the second profile annular gap gradually decreasing to the exit. V. in one direction, and the rotor 9 is mounted on the rod with the possibility of free rotation, the latter under the action of the reactive force of the water begins to rotate, thus achieving uniform distribution of cooling water, destruction steam film and intensive cooling of the tip end.When passing through the annular gap, the water flow rate gradually increases to significant values and reaches 10-60 m / s, and the pressure inversely decreases and becomes lower than the elasticity of saturated water vapor. tiny bubbles of water vapor are formed, which cause "boiling of cold cooling water and intensive cooling of the heated surface.

Thus, due to the high degree of artificial turbulization, intensive mixing of cooling water in the tip cavity is achieved, the heat exchange between the layers and the erosion of the boundary layer are improved, which sharply increases the heat transfer from the heating surface to the cooling fluid. An increase in the heat transfer coefficient leads to a decrease in the surface temperature of the tuyere tip, preventing burnout of the inter-heel portion, increasing its durability and reliability of operation.

Claims (3)

1. A lance consisting of concentrically arranged pipes forming paths for supplying and discharging water and supplying an oxidizer, a tip with nozzles and an intermediate insert inside it, with a central hole, characterized in that, in order to increase the durability of the lance, the center the hole of the intermediate insert is made passing into the socket, coaxially with which on the rod fixed at one end to the base of the tip there is a rotor, in the body of which there are inclined grooves directed to one side, and the socket probe tip with the rotor to form annular gaps umenshayuschies smoothly. 2. The lance according to claim 1, in which the total area of the inclined grooves of the rotor is 0,, 5 the area of the flow area of the tract for the supply of water. 3. A lance according to claim 1, characterized in that the area of the flow area of the annular gap between the socket and the rotor is 0.3-0.8 at the inlet and 0.1-0.3 area of the flow area of the trajectory for the water supply, and the flow area of the annular gap between the rotor and the inner surface of the tip end is 0.2-0.5 at the inlet and 0.05-0.15 at the output of the flow area of the same path.