SU1196658A1 - Air-cooled doorplate - Google Patents

Abstract

The AIR-COOLED VALVE of the working window of the fiery furnace contains a lined box-like frame with a carrier wall and a vertically and horizontally arranged bypass, communicated with oppositely located inlet and outlet pipes, so that increasing the service life, the bearing wall is made of a seam-shaped section, vertically located outlines are located on both sides of the bearing wall-and made of branches, the cavity of each of which is made tapering along the section tube .. with whom she had; soy.day.na, while maintaining the constant of the sum of the sections of the contours in the transverse plane. “VPA CO C5 about ate 00

Description

 one

The invention relates to elements of heating and heat-treating furnaces and can be used in the metallurgical and other industries.

The purpose of the invention is to increase the service life.

FIG. 1 shows a plasma melting furnace on the side of the loading window with a damper of the proposed design, general view; in fig. 2 section A-A in FIG. one; in fig. 3, node I in FIG. 2

The air-cooled damper is a box-shaped frame, which is made of a supporting wall 1, made in the form of a channel-sectional profile, and rigidly fixed on the latter, for example by welding, through contours 2 and 3. The transverse partitions 4 are mounted on the ends of the box-shaped frame. , one of which has a supply pipe 5, and on the other, a discharge pipe 6.

Each of the outlines 2 and 3 includes a branch 7, the cross-section of the cavity, which gradually decreases from the inlet pipe 5 to the outlet; it has a pipe pipe 6, and the branch 8 has a similar configuration, the cross section of which decreases in the opposite direction. The branches of the 7 contours are located on the outside of the flap, and the branches of the 8- are located on the side of the furnace working space. For each pair of branches 7 and 8, the sum of the cross sections of the cavities remains constant throughout their length.

The supporting wall and its two horizontal shelves 9 perform, in particular, the function of inserts in the cavities of the outlines 2 and 3, dividing each of these cavities into two slotted channels communicating with each other through the end clearance 10. and horizontal sections 11 of the slot channels, are significantly smaller than the flow area of the cavity of the vertical sections, i.e. lateral branches 7 and 8 contours. In this case, the flow area of the gap (i.e. the product of the width over: the gap by its length) must be equal to

S. .

sum, sections of the cavities of the branches 7 at the place of their connection with the inlet pipe. To maintain the size of the horizontal sections of the 11 slotted channels of the shelf 9, snab 966582

the wives of the restraining pins 12 freely resting on the walls of the outlines.

In the hollow, waiting for horizontal

Lining 1 3 in the form of a layer of refractory material reinforced on the carrier wall, for example, kaolin wool, is placed in 5 sections of the contours.

Holes are made in the partitions

The through which the inlet nozzle communicates with the cavities of the branches 7, and the outlet nozzle r with the cavities of the branches 8. At the same time, the nozzle 5 through the telescopic system of cylinders.

15 is connected to the injection fan 14, and the pipe 6 through a similar system to the air duct of the furnace burners.

The air-cooled damper is installed on the furnace with the possibility of raising and lowering with the help of chains 15, thrown over the black blocks. The free ends of the horizontal sections of the contours 2 and 3 and the lining face the working window: the furnace 16.

25 The valve operates as follows.

The flow of cold air blown by the fan 14 passes through the telescopic cylinders and feeds

30 pipe 5 and enters the cavities of the lateral tapering branches 7 of the outlines 2 and 3. When it reaches the narrow ends of the branches, the air rushes into the slotted channels under the influence of the velocity head

35 horizontal sections 11 bypasses, wraps around the horizontal shelves 9 and through the gaps 10 is forced out into the cavities of the side branches 8, and from there, through the outlet pipe 6 and the telescopic cylinders goes into the duct supplying the burner with air. When flowing cold air through the gaps 10, there is an intensive cooling of the 13 edge edges of the outlines protected by the lining and the heating of

 of air.

During the operation of the furnace, its valve is subjected to intense heat from the furnace gases through the window 16. However, in direct

50 contact with them comes only a small part of the surface of the through contours 2 and 3, and most of their surface is closed by the lining 13. As a result, the supporting wall 1 is completely protected from direct heat from furnace gases: the vertical part is the refractory lining material, and the horizon 3 The remaining sections are continuously washed by a stream of cold air moving from branches 7 to branch 8 Compared with the known, the proposed damper has the following advantages: the implementation of the supporting wall of the dampers in the form of a channel-sectional profile, giving the contours a configuration corresponding to this section, a profile, and inserting contours in the form of horizontal shelves of the bearing wall allows to increase the service life of the valve by reducing the surface of direct contact of the contours with furnace gases and a significant intensification of the cooling section perceiving the greatest thermal effect; Performing each bypass of 8 of the two lateral branches of a smoothly varying section while maintaining the constancy of the sum of their sections on both sides of the bearing wall along its entire length makes it possible to increase the uniformity of cooling along the length of the valve, which contributes to its increased service life. As experiments have shown, the service life of the valve increases not less than 2 times. In addition, in the proposed valve, the laboriousness of the repair is reduced several times, since it reduces to restoring minor sections of the through contours by welding, whereas in the base object it is necessary to replace the sections of contours of a much larger size.

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Claims (1)

AIR-COOLED DAMPER of the working window of a flame furnace, containing a lined box-shaped frame with a supporting wall and vertically and horizontally arranged contours in communication with oppositely located inlet and outlet pipes, distinguishing by the fact that, in order to increase the service life, the bearing wall is made of a channel-shaped section, vertically located contours are located on both sides of the bearing wall and are made of branches, the cavity of each of which is made · tapering in section, from the pipe, with with which it is connected, while maintaining the constancy of the sum of the cross sections of the contours in the transverse plane. S SU „„ 1196658 1 1196658 2