SU1184820A1 - Method of controlling temperature conditions of glass melt feeder - Google Patents

Description

The invention relates to the production of glassware and can be used to control the temperature regime of glass feeders. five

The purpose of the invention is to improve the control accuracy.

The essence of the method is as follows. The viscosity of the glass melt is determined mainly by the temperature - 1 ° swarm and the chemical composition of the glass melt. Moreover, in the process of glass melting, part of the charge or its main components may change, since they can partially remove 15 fuels that are removed from the combustion products. Therefore, by controlling the chemical composition of the glass melt during the smelting process, it is possible to determine the deviation of the main components from the specified ones. Depending on this deviation, a temperature correction is calculated for a given glass melting point, which can be represented as 25

η

^one

where 0 is the temperature value

amendments; thirty

1 < ₅ - scaling factors for each oxide;

dx - deviations of the content of each of the oxides from the specified value,%. 35

The temperature correction, determined in accordance with algorithm (1), is the value by which the setpoint of the temperature target must be changed when the chemical balance deviates from the glass melt.

The drawing shows a diagram of the device that implements this method.

In the device, the signal of the pyrometer 1, sighted on a drop of 2 glasses, pos-45 blunts into the regulator 3 of the heat load, where it is compared with the signal of the setpoint 4 of temperature. If there is an imbalance of the input signals, the controller 3 generates a control signal, 50 in accordance with which the actuator 5 changes the consumption of fuel entering the burner 6 in the direction of eliminating the imbalance. If the composition of the glass melt 7 does not change, 55 the system works on the principle of stabilizing the set temperature. In this case, the mass of the drop 2 can be regulated by a standard autonomous control loop (not shown) by changing the position of the plunger 8 relative to point 9 in terms of the deviation of the mass of the drop from the set value.

Signals proportional to the current values of the content of basic oxides from sensors 10–13 are supplied to comparison circuits 14–17, where they are compared with signals from a given content of oxides coming from setters 18–21. Quantometers can be used as sensors 10–13. The number of sensors and setters of the content of basic oxides is selected depending on the glass composition used, the materiality of the influence of one or another oxide on the viscosity of the glass melt, as well as the required accuracy of stabilizing the viscosity at the outlet of the feeder. For an example of the method implementation, an aluminum-magnesian glass of the following composition was selected,%: 3ϊΟ _ζ 72 ;. A1 ₂ 0 ₃ 3.7; CaO 6.3; MDO 3.7; Νίΐ ₂ 0 14.0;

50'e 0.30.

This glass contains four basic oxides that significantly affect the viscosity of the glass melt, therefore, to implement the method, four sets of sensors and content adjusters are required. The sensor 10 and the setting device 18 control the content of A ^ Oz, the sensor 11 and the setting device 19, the content of Ma ^ O, the sensor 12 and the setting device 20 - the content of CaO, and the sensor

13 and unit 21 - the content of M <^ 0.

When using other glass compositions, the number of sensors and setters may be more or less than that shown in the drawing. Signals proportional to the deviation of the content of oxides in the glass mass from the specified values from the circuit outputs

14 - 17 comparisons arrive in multiplication circuits 22 - 25, where they are multiplied with signals of functional scaling transducers.

26 - 29. The function of scaling transducers 26 - 29 is to set the scaling factors for each of the oxides, proportional to the degree of their influence on the viscosity of the glass mass, and the change of these coefficients in accordance with previously known functional dependencies on the signal Zaz II

viscosity sensor 30 when changing the setpoint of the task, which may be caused, for example, by changing the type of molded product.

From the output of the circuits 22 - 25 multiplication signals, proportional to the product of the deviation of the content of each of the main oxides of NA, the corresponding scaling coefficients enter the adder 31, which performs the summation of the obtained products. The output signal of the adder 31 is proportional to the magnitude of the required temperature correction.

E4820 4

If the content of the main oxides in the glass melt is as specified, then the temperature correction value is zero, and the viscosity is · '

5 corresponds to the set at a given temperature. When the content of one or several basic oxides deviates from the set value, a signal appears at the course of the adder 31

10 proportional to the required temperature correction with the appropriate sign, due to stabilization of the temperature regime, the quality of the products molded from the glass mass increases.

Claims (1)

METHOD OF MANAGING THE TEMPERATURE MODE OF A GLASS-MAIN FEEDER, including measuring the temperature of the glass mass at the output of the feeder, comparing with the set point and changing the thermal load, characterized in that, to improve the accuracy of control, the mass of the main oxides in the glass is additionally measured, the mass deviation of each of the main oxides from a given, calculate the required amount of heat for each of the main oxide, determine the required heat for glass, and adjust the task of heat load. nineteen 511 ... 1184820 I184820