SU1189819A1 - Method of controlling glass melting process - Google Patents

Abstract

METHOD OF CONTROLING THE CREWING STEEL GLASS, including measuring the level of the glass mass in the furnace, determining the deviation from the set point, the level of the glass mass and adjusting the feed rate of raw materials, in addition to measuring the fuel consumption, temperature, density of raw materials materials and adjust the feed rate of raw materials in directly proportional to their density, and fuel consumption in inversely proportional to density About raw materials. 00 with 00 with

Description

11 The invention relates to the control of glass melting processes in glass melting furnaces. The aim of the invention is to improve the accuracy of control. The essence of the method is as follows. It is known that the raw materials loaded into the furnace consist of a mixture of the charge and glass, and their ratio may vary during the production process for a variety of reasons. When the mixture is melted in a bath furnace, chemical reactions take place with the release of gases, which, together with the combustion products, are removed through the chimney, and in this case, small fractions of the mixture are carried away with them. The loss of the charge during melting reaches 18%, while the cullet melts almost without loss. Therefore, a change in the ratio of the charge charged to the furnace and the glass at the constant volume loading rate causes an inconsistency in the mass of materials loaded into the furnace, which, in turn, causes disturbances in the temperature mode of cooking and fluctuations in the glass melt level. In addition, the energy required to melt a certain amount of the charge, significantly exceeds the energy required to melt the same amount of broken glass, which, when the charge / cullet ratio changes (the average density of raw materials), changes in temperature and as a result, to the displacement of the boundaries of the charge and cooking foam. A change in the charge / cullet ratio causes a change in the average rate of the reaction of silicate and glass formation. An increase in the content of bo in the mixture of raw materials leads to a decrease in the required amount of heat, an increase in temperature, and a rise in the level of the glass mass due to a decrease in the loss of the charge. In turn, an increase in temperature favors a more rapid melting, i.e. further increase the level. Due to the much smaller inertia of the impact on the channel: the glass mass level — the position of borders and ash — than the temperature — the position of the boundary of the charge and foam, the disturbing effect 9 of the level deviation prevails over the temperature perturbation; which leads to the displacement of the boundary of the charge and the cooking foam, and an even greater temperature rise is required to compensate for the disturbance. Thus, from the point of view of the theory of autoregulation, the process of glass melting in the zones of snlikato- and glass-formation is unstable with respect to disturbances on the side of oscillations of the charge / cullet ratio. To compensate for these shortcomings in the process, it is envisaged to additionally measure the density of raw materials and adjust the loading rate of raw materials in direct proportion to the measured density of raw materials, and the fuel consumption correction should be inversely proportional to the density of raw materials. The drawing shows a diagram of the device that implements the proposed method. The device contains a hopper 1, a density sensor 2 raw materials, scaling converters 3 and A, a regulator 5 levels of glass mass 6 in the furnace, a level gauge 7 and a setting device 8 levels, a loader 9 with an actuating element, the controller 10 temperature in the furnace , the sensor 11 temperature of the furnace space, the sensor 12 of the fuel consumption and the setting device 13 of the fuel consumption. The device works as follows. The current value of the density of raw materials in the hopper 1 is measured by sensor 2 and is fed to the inputs of scaling transducers 3 and 4. Scaling converter 3 generates a signal proportional to the current value of the density of raw materials in the bunker, which is fed to one of the glass melt level controller 5 glass furnace. The other input of the regulator 5 receives a signal from the output of the equilibrium 7 about the current value of the glass mass in the glass melting furnace. The third input of the controller 5 receives a signal from the output of the setpoint adjuster of the 8th level of the glass oil in the furnace. From the output of the scaling converter 4 signal, inversely proportional to the current value of the raft

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The raw materials in the bunker are fed to one of the inputs of the temperature controller 10 in a glass melting furnace. The other input of the controller 10 receives a signal from the temperature sensor P, the third - from the fuel consumption sensor 12 to the fourth from the fuel consumption setting device 13.

When the charge / cullet ratio changes in the mixture of raw materials in the feed bin, the unbalance appears at the inputs of regulators 5 and 10. In this case, the regulator 5 changes the speed of the mixture / cullet mixture entering the kiln, for example, by adjusting the engine speed of the loader 9, and the regulator 10 changes the fuel consumption per kiln by means of an actuator and a damper on the fuel line to control inputs.

Thus, the regulator 5 prevents the level fluctuations by keeping the volume of glass mass in the furnace constant regardless of the charge / cullet ratio in the mixture of raw materials being loaded, and the regulator 10 prevents displacement of the boundaries of the charge and cooking foam by timely correcting the heat mode of the furnace. To eliminate the possible influence of other factors that violate the level of the glass melt in the furnace, the level 5 sensor and the level 8 setting device are used in the control loop:

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- BY HELP OF WHICH, WITHIN THE TROUBLE OF THE OTHERWISE, the flow of raw materials into the furnace is corrected.

The fuel consumption sensor 12, the air flow rate sensor} 3 and the temperature sensor II are used to control the temperature mode of the furnace according to a known scheme - flow stabilization with temperature correction.

The use of the method makes it possible to stabilize the level of glass melt and the boundary of shnhta and foam with fluctuations in the average density of raw materials loaded into the furnace, and thus improve the quality of glass melt in the mine. According to preliminary calculations, the use of the method on high-capacity glass melting furnaces with a total mirror area of 200 m and a pool depth in the cooking part, 15 m, allows to increase the utilization rate of the glass mass (0.9% kis due to increased homogeneity and stabilization of the glass mass temperature; fuel consumption by 1.1%, to increase the turnaround time between glass melting furnaces by 3%. At the same time, the annual economic effect from using the method on one furnace will be 27.0 thousand rubles. ex enterprise's branch will provide annual economic ef. fact about 1 million rubles.

Claims (1)

METHOD FOR CONTROLLING A GLASS COOKING PROCESS, including measuring the glass melt level in the furnace, determining deviations from the set value, glass melt level and adjusting the feed rate of the raw materials, characterized in _? that, in order to improve control accuracy, fuel consumption, temperature, density of raw materials are additionally measured and the feed rate of raw materials is adjusted in direct proportion to their density, and fuel consumption is inversely proportional to the density of raw materials. SU „." 1189819