SU1413055A1 - Molybdenum electrode - Google Patents

Abstract

The invention relates to glass industry, in particular to glass furnace electrodes. The aim of the invention is to improve the operating conditions by allowing the electrode to move into the molten glass during the operation of the furnace. The molybdenum electrode contains a molybdenum rod 1 placed inside a steel pipe 2 with a flange 3, a washer 4 mounted between pipe 2 and the rod 1 at a distance of up to 4 diameters of the rod from the plane of the flange 3. Such. The electrode fulfillment makes it possible not to build up the molybdenum rod of the electrode during operation of the furnace 3 Il. 1 tab.

Description

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WITH

four:

SR O SP O1

The invention relates to glass industry, in particular, to electric furnaces of glass melting furnaces, i. The purpose of the invention is to improve its operation by allowing the electrode to move in the races: melt glass during operation I of the furnace.

i Figure 1 shows the molybdenum I electrode, longitudinal section; 1FIG.2 shows temperature variation curves for the thickness of a bar in a glass-melting furnace | when cooking glass from 120-1; on fig.Z - the same, when glass is being melted, - Electrode contains molybdenum I rod 1, steel pipe 1 INO of pipe 2 with flange 3, steel | washer 4, lead gasket 5 and gay. cu 6. The electrode is installed horizontally | or vertically in the opening | 7 of the wall (or bottom) bar 8 of the glass-melting furnace. I Depending on the temperature on: Chal of deformation (dilatometric I softening point corresponds to 10 Pa-s visibility) of the glass of the given composition washer 4 is welded inside; pipes 2 at a distance from the plane: location of flange 3 from O to 4 diameters of rod 1 in the direction of the melt or in the opposite direction (Fig. 1, dotted line).

; The device works as follows;

I The electrode is installed in a wall | glass furnace. The molten glass mass fills the opening 7 of the beam | 8 and at a viscosity of 10 Pa “s reaches the washer 4. At the specified viscosity | the melt does not penetrate into the annular gap. between the washer 4 and the rod I, provided for the unimpeded movement of the rod -1, which allows the jack to easily push the rod 1 into the melt during the operation of the furnace. In order to allow the electrode to move, it is necessary to know the dilatometric softening temperature for a given composition. in the refractory bar, the speed of corroding the beam, which in turn depends on the wall design, the refractory material, the glass melting temperature, etc.

In the examples presented in FIGS. 2 and 3, a TSAK1711 refractory was used for C120-1 glass (lined with a thermal insulation on the outside). Dia

electrode meter taken minimum 3d mm.

As follows from Figures 2 and 3, the temperature change curves 6 and 7 (Fig. 2) and 2 and 3 (Fig. 3) intersect the plane of the washer during the first and last movement of the electrode in the temperature regions not lower than the dilatometric softening temperature and not higher than T of the corresponding glass composition (for glass

five

0

Q

0

five

five

0

five

S120N.A and

for glass TCM-514 - t

n.d

 and 1050 C and

5 Tf). Going beyond (-4F) - (+ 4F) even by 0.05F, i.e. (-4.05F) and (+ 4, OZF), in the first case, reduces the temperature by 10-15 ° C and an upper annealing temperature is reached for C120-1 glass, which prevents the electrode from moving, and in the second case, the temperature rises 20-25 ° C higher Th, which leads to the penetration of glass into the annular gap.

The table for various glass compositions shows the distance of the washer 4 from the plane of flange 3 for two diameters (Φ) of molybdenum rod 1, at which the melt reaches to the washer 4 and stops, thus providing ease of movement in the furnace rod 1 (in the direction of the melt; - in the opposite direction).

By increasing the distance of the washer 4 from the plane of the flange 3 more than 4F of the rod 1 in one direction or the other, conditions preventing movement of the rod 1 in the melt are created, namely: when the washer 4 is removed from the flange 3 in the direction of the melt more than 4F of the rod 1; the melt viscosity is less than Pa-s and it fills the annular gap, and then flows even lower and solidifies, which prevents the rod 1 from moving into the melt; when the washer 4 is removed from the flange 3 in the opposite direction for a distance of more than 4F of the rod 1, the glass melt melts, it fills the opening 7, does not reach the washer 4, hardens and also prevents the movement of the rod 1,

The lead gasket 5 and the nut 6 are designed to provide practical sealing of the part of the molybdenum rod outside the melt.

In this case, the size of the annular gap between the washer and the rod ensures unhindered movement

3

the molybdenum rod and at the same time preventing the passage of glass below the installation location of the washer for the entire period of operation of the furnace is determined by the following formula:

.. "t.n t (Ft-F) 10, p1

where is oi

) lo

S

Fe

F.

F

 57th degree KLTR molybdenum; PO-Yu grad- - KLTR.

become; molybdenum diameter

rod, mm; - steel outer diameter

pipes, mm; t is the temperature in the plane

the installation of the washer in the final period of operation of the kiln, determined on the basis of practical data, C. The indicated temperature, depending on the glass composition (from low-melting glass cements to quartz-shaped glasses), varies widely from 500 to also depends on the rate of corrosion of the refractory bar and the presence or the absence of an external thermal insulation layer. The value of this temperature with an accuracy of +10 ° C is also determined by calculation for each specific

five

0.01 tolgchik l annular gap, ensuring the goal in the final period of the furnace, mm.

Thus, a molybdenum electrode without water cooling, made in the form of a molybdenum rod placed inside a steel pipe with a flange, and having a washer, was set

between the tube and the rod at a distance of up to 4 diameters of the rod from the plane of the flange, allows to improve the conditions of its operation due to the possibility of movement of the rod

in the melt and the absence of the need to build up the rod during operation of the furnace.

Claims (1)

Invention Formula A molybdenum electrode containing a molybdenum rod and a flange, characterized in that, in order to improve the working conditions, by allowing the electrode to move into the glass melt during the operation of the furnace, it is equipped with a steel pipe that encloses the rod and is installed between the rod and tubes with a steel washer rigidly fastened to the inner surface of the pipe, while the washer is placed at a distance of no more than the diameters of the rod diameters from the plane of the flange. Cooking temperature 1850 + 20 Temperature at which glass viscosity is  Pass Washer distance from flange plane, mm, with FZO. F50 + 4, RP + 2.4 F 1500 + 10 1580 + 10 1350 + 10 600 500 390 -2, ZF 1.4F -4, PF -2,4 F W 600 800 1000 1200 lifOO 160Q SCHO S -f-T I GI I g I RP I G rfFa9 .3 1200 fWO C Plenos / pacf7o OH effUff