SU1025487A1 - Nozzle for secondary cooling of tube blank interior surface - Google Patents

Abstract

NOZZLE FOR SECONDARY COOLING OF THE INTERNAL SURFACE OF THE PIPE PREPARATION, the enclosure with the central and side supply channels and the displacement chamber, which is about one-second. in order to improve the quality of the workpiece by improving the cooling conditions of the internal cavity, the nozzle body is made in the form of a diffuser and a confuser, the diffuser surface is made solid, on the confuser surface slotted holes are made, the side channel 11 and 1 is located parallel to the central one, and the mixing chamber is located between the lateral inlet channel and the diffuser, file // J // // //////

Description

 This invention relates to metallurgy, in particular to the continuous casting of tubular blanks.

The known nozzle for cooling ingots, comprising a housing with a central supply of the channel, will adopt a cylindrical section of the housing containing one opening in the form of a slit i

The known nozzle does not allow uniform cooling of the inner surface of the billet.

The known nozzle for secondary cooling of the inner surface of hollow ingots during continuous casting of steels and alloys / containing, consisting of a confuser and a diffuser, is a central channel from which the supply channels extend to the lateral perforated surface of the diffuser and confuser. The nozzle CEC produces a large area of coverage for intensive cooling of the internal cavity of the tubular billet 12.

However, the known device cools the inner surface with separate insulating jets that do not provide uniform cooling,

The closest to the invention in its technical essence is a device for cooling continuous / nolith ingots, comprising a housing with central and lateral feed channels, the lateral channel being perpendicular to the central mixing chamber and the Hemisphere containing one slot. The device provides a soft and uniform cooling of the area of the outer surface of the workpiece, but it cannot provide uniform cooling of the inner surface.

The purpose of the invention is to improve the quality of the workpiece by improving the cooling conditions of the internal cavity.

To achieve this goal, in the nozzle for secondary cooling of the inner surface of the billet, comprising a housing with central and side supply channels and a mixing chamber, the housing is made in the form of a diffuser and a confuser, the surface of the diffuser is solid, and the holes The connecting duct is located parallel to the central one, and the mixing chamber is located between the side supply duct and the diffuser.

Figure 1 is given the proposed device; Fig. 2 is a plot of the distribution of the heat transfer coefficient along the length of the billet,

The nozzle consists of a housing I / central supply channel 2,

Kgsher 3 mix, side; | channel 4, the diffuser section 5, the confused section 6 with slotted holes 7 and the flywheel 8.

The nozzle operates as follows o6i azom. I

 The air enters channel 2 at high speed through the central submerge channel 2 into the mixing chamber 3, create a vacuum in it. Water in side channel 4 is sucked into the mixing chamber. Formed with the water-air jet of dispersed liquid enters the diffuser section 5, iatem into the confusor section 6 and ejects the slit-like holes 7 are ejected; from the outside in the form of fan jets.

The mixing of the central under {1 feed channel 2 with the help of flywheels 8 regulates the soft relationship between water and air.

A part of the nozzle body, containing the mixing channels of the mixing chamber and the D1 fusion section, is placed inside the mandrel of the mold, and attach the corefusion section of the nozzle to the end of the pipe and extend it to the initial section of the tubular billet.

The proposed nozzle design, in which the use of a water / air mixture is envisaged, provides a leveled cooling temperature curve with a sufficiently high heat transfer intensity, which was confirmed by laboratory testing of the nozzle (Fig. 2).

FIG. 2 shows a plot of heat transfer coefficient oirio for the length of the pipe billet at the flow rate (e of air G and different

moisture content: d 0.235 kg / kg

2) (line 1), d 0,054 kg / kg (line

d 0.0286 kg / kg (link 3). and d (clean air, line 4). From the graph can be seen. What clean air gives With the lowest heat transfer coefficient (line) 4j h & l The moisture content is higher, the higher the heat transfer intensity (lines 3, 2 and 1). Note that the design of the nozzle allows you to adjust the moisture content and, consequently, the intensity of heat transfer,

Lines 1-4 show that the intensity of heat transfer at the beginning of the tubular billet is large enough, and the temperature schedule of cooling is equalized.

The advantages of the proposed nozzle structure are the achievement of uniform cooling of the tubular billet, the compactness of the nozzle, the ability to accommodate inlet Kaiia-i, weight shields and diffuser section in the mandrel, reduction of the brigis and an increase in the yield of suitable metal;

increase the reliability of the installation (since the operation of the nozzle on the air-water mixture is less explosive /. on the water) and. less capital costs than with water cooling) | building / requiring cooling towers or spray basins .. /

The people's economic economic effect from introducing the results of the development of the cooling modes of the billet provided by the nozzle to an installation with a capacity of 200.0 thousand tons / year is approximately 200.0 thousand rubles.

Claims (1)

NOZZLE FOR SECONDARY ¹ COOLING OF THE INTERNAL SURFACE OF THE PIPE BILLING, comprising a housing with a central and side supply channels and a displacement chamber, about t and -. repetitive: in order to improve the quality of the workpiece by improving the cooling conditions of the internal cavity, the nozzle body is made in the form of a diffuser and confuser, and the diffuser surface is solid, slotted holes are made on the surface of the confuser, the side feed channel is parallel to the central one, and the mixing chamber located between the side inlet _{with the} channel and the diffuser, ι f u sl M