SU376327A1 - METHOD FOR DETERMINING THE ZONE OF TEMPERATURE MAXIMUM IN A GLASS BATHROOM FURNACE - Google Patents

Description

one

This invention relates to methods for conducting a glass melting process in glass furnaces.

The known methods for determining the position of the temperature maximum zone in a glass melting furnace by temperature or by the temperature difference of the glass melt at two points measured by thermocouples require the use of expensive equipment that is unreliable under conditions of high temperatures.

The purpose of the invention is to simplify the measurement system and increase its reliability.

This is achieved in that the position of the temperature maximum zone is determined by the position of the maximum of the glass mass level by measuring the difference of the glass mass level at two points located at a constant distance along the furnace axis near the temperature maximum zone, using electrical level sensors, such as pneumatic, etc.

FIG. 1 shows the surface of a glass melt mirror in a glass melting furnace; in fig. 2 - installation diagram with a pneumatic level sensor; in fig. 3 - installation diagram with electrical contact level sensor.

In the case of a stationary temperature field, due to the difference in temperature and, consequently, the density of the glass mass, two different levels of HI and // 2 are established at the ends of the furnace basin, and in the zone of maximum temperatures, the maximum height of Yao is established.

Exceeding the maximum level above the glass melt at any H point can be found from the equation:

Ya.R, Yar,

where (

RO; p is the density of the glass mass, respectively, at a temperature of about and t;

a is the temperature coefficient determined from the dependence curve (t) for a given glass composition. After transforming the equation we get

I am, - I am. And (f - f) I ,.

With a glass melt level in the furnace basin of 0.6-1.2 and a temperature coefficient for the most common glass compositions is 0.0001 1 / degC.

AJ (0, 12) D / mm.

To determine the position of the temperature maximum zone with an accuracy of ± 5 ° C, it is necessary to determine the difference of the glass mass level at two points with an accuracy of 0.3-0.6 mm. This is feasible, since it is not the absolute value of the deviation of the glass mass at two points that is measured, but relative (the excess of one point over the other), i.e., all errors are minimized.

Equality of signals from sensors for a pneumatic level gauge or simultaneous signals (touching the glass mass surface) for an electric contact level gage is possible only if the glass mass levels are equal at two points along the furnace axis, which is obtained by placing these points on the left and right relative to the temperature maximum.

The imbalance of the signals in one case or the non-simultaneity of their triggering in the other indicates a shift in the temperature maximum along the basis of the furnace.

The system determining the position of the temperature maximum zone works as follows.

Level 1 pneumatic sensors are connected to the comparison device 2. When the signals from the sensors on the output of the comparison device are equal, the signal is zero and the actuator 5 is at rest.

When the temperature maximum is shifted, the equality of the glass melt levels at two points is violated and the pressure signal from one of the sensors will be greater than from the other. As a result, the comparator diaphragm 4 will be propelled and will open the nozzles 5, 6 to give a pulse to the actuator to move the rods to a point with greater pressure until the pressure is equal, i.e. the sensors are not symmetrically positioned maximum.

The location of the zone of maximum temperatures can be determined by the position of the rod.

Electrocontact needles 7 are connected to sensitive relays S and 9 of electronic unit 10 of electrocontact level gage URK-2. In the case of a symmetrical arrangement of the 5 rods relative to the temperature maximum while moving down, the needles simultaneously touch the glass mass, therefore, no signal is sent to the actuator.

When the temperature maximum is shifted to 0, the equality of the glass melt levels at two points is broken and one of the sensors touches the glass melt before the other. As a result, the corresponding relay 8 or is triggered and an impulse is given to the actuating mechanism // to move the rods towards a point that is exceeded until the needles touch the glass bar simultaneously, i.e. until the sensors are symmetrically positioned relative to the temperature maximum .

The location of the zone of maximum temperatures is also determined by the position of the rods.

Subject invention

The method of determining the temperature maximum zone in a glass-melting bath furnace, in that, in order to simplify the measurement system and increase its reliability, the position of the temperature maximum zone is determined by the position of the maximum glass mass level by measuring the level difference

glass melts at two points located at a constant distance from the furnace axis near this zone with the help of level sensors installed at these points.

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