SU1527275A1 - Packing of air-heater of blast furnaces - Google Patents

Abstract

The invention relates primarily to the high-temperature heating of air and other coolant gases used in metallurgy and power engineering. The purpose of the invention is to reduce the manufacturing cost of the filling by increasing the durability of the dies, intensifying heat exchange by increasing the relative heat transfer surface of the nozzle and turbulent flow. Bricks 1 are made in the form of an oblique parallelepiped with the upper side of the wide side face displaced relative to the lower side by 0.03 ... 0.1 width of brick 1, while on these faces x grooves 4 are made at a 45 ° angle with a step between them 0.25 ... 1.0 hydraulic diameter of the vertical channel. Applying the invention will increase the blowing temperature. 3 il.

Description

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The invention relates primarily to high-temperature heating of air and other coolant gases used in metallurgy and power engineering.

The aim of the invention is to reduce the cost of manufacturing the nozzle by increasing the durability of the dies, and in terms of the magnitudes of the values are due to the following. When the upper side of the wide side face is displaced relatively lower by an amount less than 0.03 of the width of brick 1, the efficiency of the cracks formed decreases and the intensity of heat exchange in the nozzle is almost equal to the intensity of heat exchange in the nozzle

the tenification of heat transfer by increasing with continuous smooth channels, the emergence of a relative heat exchange surface and flow turbulization.

FIG. I shows the element of the nozzle with semicircular grooves; on 4) ig. 2 - nozzle assembly, view in front of 5; in fig. 3 - the same, top view.

The nozzle of domain heaters or furnaces consists of packed bricks 1 in the form of oblique parallelepiped possibility of their clogging. At values greater than 0.1, the width of brick 1 decreases the mechanical strength and the relative heating surface of the nozzle, and, consequently, intensively. heat transfer. The angle of inclination of the grooves 4, equal to 45, provides the same intensification of heat exchange and swirling flow as in motion.

the value ranges of values are due to the following. When the upper side of the wide side face is displaced relatively lower by an amount less than 0.03 of the width of brick 1, the efficiency of the cracks formed decreases and the intensity of heat exchange in the nozzle is almost equal to the intensity of heat exchange in the nozzle

Capability of clogging up. At values greater than 0.1, the width of brick 1 decreases the mechanical strength and the relative heating surface of the nozzle, and, consequently, intensively. heat transfer. The angle of inclination of the grooves 4, equal to 45, provides the same intensification of heat exchange and swirling flow as in motion.

yes with the displacement of the upper side of the wide-heated environment, and when moving in

 which side face of the lower by 0.03-0.1 width of bricks 1, bricks 1 form in the process of laying vertical channels 2 and slots 3, bricks 1 are filled with grooves 4 semicircular 25 with an angle of 45 and pitch between them 0,25;; 0 hydraulic diameter of the vertical channel 2.

The nozzle works as follows.

The flue gases during the period of heating, the passage from the top down through the vertical channels 2 and the slots 3, give off heat to the refractory bricks 1. After a certain period, the flow of combustion products is turned off and air or another heated gas is passed through the nozzle from the bottom up.

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the reverse direction is heated.

With a relative step between kana

Kami 4 less than 0.25 and more than 1.0 hydraulic diameter d j. channels 2 of the nozzle, an increase in heat exchange rate is accompanied by a sharper increase in hydraulic resistance.

The application of the invention improves

heating efficiency to blow.

Claims (1)

Invention Formula Nozzle of blast furnace air heaters containing refractory pa-lepticoids set to form vertical channels, characterized in that, in order to reduce the cost, to manufacture it by increasing the cost of the dies, to intensify heat exchange by increasing the nozzle heat exchange and turbulization flow ° a, refractory Making bricks 1 in the form of an oblique parallelepiped minimizes the contact area between them in the transverse direction, providing a nozzle for air heaters of blast furnaces containing refractory pylons in the form of parallelepipeds installed with the formation of vertical channels, characterized in that, in order to reduce the cost, its manufacture by increasing the cost of dies, intensifying heat exchange by increasing the relative heat exchange surface of the nozzle and turbulizing the flow, fireproof Chiv part in the heat exchange of the entire area - 45 bricks are made in the form of an oblique paddy of the narrow side faces of the bricks 1 nozzle. The durability of dies for making bricks 1 of the front of the forges increases due to the absence of protrusions. 50 o The inclined grooves 4 on the edges are flow turbulators (break the laminar boundary layer and contribute to the swirling of the flow, increasing the heat transfer rate. The indicated di-55 Parallelepiped with the upper side of the wide side face offset relative to the lower side by 0.03-0.10 brick width, while the wide side faces of the bricks are made with the semicircular fory arranged at an angle of 45 to the horizontal axis with a pitch between them equal to 0.25 1, 0 hydraulic diameter of the vertical channel. the reverse direction is heated. With a relative step between the ditches, the tanks 4 are less than 0.25 and more than 1.0 of the hydraulic diameter d j. channels 2 of the nozzle, an increase in the intensity of heat exchange is accompanied by a sharper increase in the hydraulic resistance. The application of the invention improves heating efficiency to blow. Invention Formula A nozzle for blast furnaces containing refractory bricks in the shape of parallelepipeds installed to form vertical channels, characterized in that, in order to reduce the cost, its manufacture by increasing the durability of the dies, intensifying heat exchange by increasing the relative heat exchange surface of the nozzle and turbulizing the flow. refractory  the bricks are made in the form of an oblique parallelepiped with the upper side of the wide side face offset relative to the lower one by 0.03-0.10 the width of the brick, while the wide side faces of the bricks are made with the grooves of the semicircular fory at an angle of 45 to the horizontal axis with a step between them 0.25-1.0 hydraulic diameter of the vertical channel. FIG. g Fig.Z