SU908494A1 - Device for secondary cooling of continuous cast ingot - Google Patents

Description

(54) DEVICE FOR SECONDARY COOLING OF CONTINUOUSLY INGOT

I

The invention relates to metallurgy and can be used on non-continuous machines;

In the secondary cooling systems of continuous casting machines, devices are used to form a water / air mixture and supply it to the ingot.

Closest to the proposed technical entity is a device that contains a pipe in a pipe with channels for the supply of water and air, air and air outlets, made by forming pipes l.

The disadvantages of the known device are large air consumption for the formation of a water-blown mixture and a small interval for controlling the intensity of cooling due to the small surface of the interaction between water and air jets.

The purpose of the invention is to increase the cooling uniformity while controlling its intensity in a wide range.

This goal is achieved by the fact that, in a device made in the form of pipes with holes located one inside the other and equipped with pipes for supplying water and air, the outlets of the outer pipe 10 would be arranged in pairs, on both sides of each outlet of the inner pipe, limiting reflective pads coaxially with the outlet openings of the inner tube; the width of the reflective pad is 0.2-150 of the diameter of the outer tube.

Figure 1 shows the proposed device, a longitudinal section; on

And FIG. 2 - section aa in fig ,, 1.

Claims (1)

The device consists of an external pipe 1 with an air inlet pipe 2 and openings 3, Spone with a pipe 1 installed inside pipe 4 with a water supply pipe 5 and outlets 6. Holes 3 are located along the generatrix of the external pipe 1 in pairs, limiting the reflective areas 7. The outlet openings 6 of the inner tube 4 are located coaxially with the reflective areas 7. The end caps 8 and 9 create a closed volume between the inner and outer tube. The width of the reflective pad B is 0.2–1.0 in diameter of the outer tube D. Experiments show that the width of the reflective pad B, equal to 0.2 of the diameter of the outer tubing D, ensures a uniform flow of the water / air mixture with a minimum water pressure of 0.5 atm. and air 1.0 atm, and width B, equal to 1.0 D, uniform torch at a maximum water pressure of 5.0 atm and air: a 6.0 atm. The maximum working pressure of water of 5.0 atm and air of 6.0 atm is selected taking into account the existing industrial highways of the shop 15, the device works at the following way. Water under pressure of 0.5–5.0 atm is supplied through the water supply pipe 5 1 of the inlet С1-pipe 1 to outlet 1; M from the weight 6 and from the third expires by the wells and falls onto reflector platforms 7, collides with the reflecting platform 7, the water jet is opened in a thin film with a thickness of 0.2-0.5 mm. Simultaneously with the supply of water to the device, compressed air is supplied through the air inlet pipe 2 into pipe 1 at a pressure of 1.0-6.0 atm, which exhausts through apertures 3. A water film traps air out of opening 3 by air, is crushed to form an air / water mixture served on ingot. The cooling intensity is controlled by varying the pressure of water and air supplied to the device. The water pressure of 0.5 atm and air of 1.0 atm provides the least intensive cooling of the ingot due to the low percentage of water in the water-air mixture and the low dynamic pressure of the water-air mixture per ingot, and the water pressure is 5.0 atm and air 6.0 atm - the most intense due to the increase in the percentage content in the water-air mixture of sprayed water and its dispersion, as well as due to the increase in the dynamic pressure of the water-air mixture on the ingot. For example, a device was manufactured for the secondary cooling of a continuously cast ingot with an outer tube diameter of 40 mm and an inner tube of 20 mm. On the generatrix of the outer tube, a pair of slit-shaped holes with a thickness of 2.0 mm is made in pairs, which limit the reflecting area 20.0 mm wide. The tests reveal the stable operation of the device. When the pressure of water and air varies within the industrial limits: water 0.5-5.0 and air i, 0-6.6 atm. A device for the secondary cooling of a continuous-cast ingot, made in the form of tubes with holes, one inside the other and provided with nozzles for supplying water and air, characterized in that, in order to increase the uniformity of cooling while controlling its intensity in a wide range, the output holes the outer tube is arranged in pairs, on both sides of each outlet of the inner tube, limiting the reflective pads coaxially with the outlet openings of the inner tube, while ina reflectance pad is 0,2-1,0 diameter of the outer tube. Sources of information taken into account in the examination 1. French application № 2256790, cl. B 22 D 11/12, 1975.