SU1237642A1 - Method of founding glass - Google Patents

Description

one

The invention relates to the glass industry, in particular, to the technology of glass production in glass melting furnaces in the production of sheet glass and other types of glass, which are brewed in furnaces with a cross-sectional direction of the flame.

The purpose of the invention is to increase productivity, improve glass quality and save fuel.

The proposed glass melting method is implemented as follows.

At certain time intervals (for example, 5 min), thermoelectric converters record the temperatures of the glass mass at three points of the melt in the bulk of the pool: 1 point — bottom layers of the sludge stream; 2- point - bottom layers at the beginning of the production flow in the temperature maximum zone} 3- point - in the boot pocket at a height of 300 mm from the level of the glass mass mirror.

The readings of the thermo-electrical converters installed in the indicated zones of the furnace basin are used for calculating by means of control (determined for this particular furnace) the level of the control effect on the fuel consumption correction system on the burners of the cooking part of the furnace. The control action is then transmitted via a communication device to the actuators of the fuel consumption controllers for the individual burners of the furnace. In this case, the fuel consumption correction is carried out in such a way that the distribution of heat loads over the burners is kept constant at the level of the furnace fuel ratio between the burners of the furnace. The specified actions are programmed by a special algorithm entered into the issuance of a command to control a computer.

As a result, the operation frequency is commensurate with the frequency of the control actions and the frequency of the mode disturbances under the influence of uncontrolled technological factors is effective in correcting the heat balance of the cooking part of the furnace over time. At the same time, such important conditions optimization problems are solved.

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the glass melting process, as ensuring the constancy of the specified boundaries of the charge zone and the cooking foam, economical fuel consumption at a level not exceeding its need in accordance with the technological requirements, stabilization of the glass melt temperatures in the volume of the cooking basin with fluctuating thermal conditions

fuel consumption s limits, not exerted; 1; their disturbing effect on the temperature of the melt in the working channel. Under these conditions, it may additionally be carried out effectively.

Correction of the thermal regime in the student part of the furnace, especially for a period of sharp violations of the thermal condition. Conditioning of the working mass of the glass melt, for example, when glass-forming devices are disconnected. With this goal, thermoelectric converters with a definite time interval (for example, 5 min) are used to record glass temperature values.

lomass in the bottom layers of the beginning of the production flow and topside structure.

As shown by tests conducted on an Air Force furnace, the increase in

a corrective effect on fuel consumption on the burners of the cooking section to a level greater than 0.05 of the total fuel consumption leads to unacceptably large temperature fluctuations

glass melts in the production flow. When this parameter is less than 0.1, the influence of uncontrollable technological factors is not fully compensated.

 Reducing the time interval between interchangeable corrections to a level of less than 0.15 of the length of the flame transfer period is not technologically justified, so in this case

the frequency of controlling influences on the actuators of the fuel supply will exceed the frequency of thermal disturbances under the influence of uncontrolled factors. With

the value of this parameter is more than 0.5, incomplete compensation occurs for the disturbing effects of these factors. The same conclusions are made regarding the rationale for the inter

the shaft between adjacent heat load corrections at the burner nearest to the stud. With increasing - the same corrective action

for fuel consumption in this burner to a level greater than 0.01 of the total fuel consumption in the remaining burners of the cooking part, the thermal uniformity of the glass melt flow rate is reduced. If this parameter is less than 0.005, compensation for the effect of the change in the heat balance of the student part of the factors takes place incompletely.

The invention is illustrated by examples of the implementation of the proposed method (object 5-burner stove Air Force),

The control algorithm of the actuators for fuel supply on the burners of the cooking part is determined by the equation

, 1 + 0.95369t, -0.6565t2- -3.8538t ,,

H

t, where A is the gas flow rate in the first four pairs of burners; temperature of the bottom layers of glass melt in the basin section between 1 and 2 pairs of burners (1 point); temperature of bottom layers of glass melt in the basin section between 3 and 4 pairs of burners (2 point); glass melt temperature in the boot pocket at the level of 300 mm from the melt mirror (3-point). Depending on the change in the melt temperature at the indicated points, the control effect (correction) on the operating fuel supply mechanisms for the first 4 pairs of burners was calculated by the equation. The calculation results show that for temperatures t, tj and t equal to the period of the removal of information (in the example of 3 periods) 1120, 1180, 1150, 1100, 1160, 1130, 1140, 1200, 1170 s, the required gas flow is MS / h 2001.8, 2072.8, 1930.6,

Analysis of this data shows that 50

55

the deviation of the temperature mode by an average of 20 ° C entails the need to change the gas flow rate by about 70 with a total gas flow rate of about 2000, i.e., at the level of 3% of the total flow rate, which does not cause significant changes in the glass melt temperature in stu0

s

0

five

part when stabilizing the thermal regime in the cooking part.

The control algorithm of the executive mechanism for supplying fuel to the last pair of burners of the heated part of the cooking basin, calculated on the basis of the assessment of the thermal balance of the student part of the furnace, taking into account the current correction of fuel consumption in the cooking part of the burners of the cooking and clarification zones, is determined by the equation:

, 65-10 -1,46-ldVl, 26-, och-,

where B is the gas consumption in units of the burner above the telly zone from the total consumption of fuel; Q - total 1st fuel consumption for the burners of the cooking and clarification zones, m / h;

t. - temperature of bottom layers of glass melt in the basin section between 3-4 pairs of burners, ° С; tj is the temperature of the gas medium

furnace space behind the screen in the student’s unit, characterizing the temperature of the glass mass in the working flow, C,

Depending on the change in the parameters of the last equation, an additional control action was calculated on the last burner of the heated part of the cooking basin.

As an example, the calculation results for three periods of the furnace operation are given. Parameter Value:

Period Q 2060,

II period Q 2080,

III period Q 2080.

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1195 ° С, t, 1198 ° С, tj 1200 С, t.

1271 ° C;

1270 ° C;

1272 С,

The calculated fuel consumption for the last pair of burners of the heated part of the cooking basin is 0.0364, 0.0327, 0.0286 of the total fuel consumption per melting and clarification zone for the three furnace operating periods.

Testing this algorithm in real conditions of the Air Force kiln showed that

f

the use of additional control of the heat load on the last couple of burners of the heated part of the cooking basin by quantifying the degree of temperature change of the upper structure B of the stove's stove part, taking into account the current correction of fuel consumption for the stove and stabilizing the heat balance in the cooking part, ensures constant the glass melt temperature in the production flow at the level when the fuel consumption on this burner varies from 0.005 to 0.01. The total fuel consumption of the remaining burners.

On a regenerative glass furnace furnace with a heated area of 138 m with five pairs of burners, a test of the cooking method is carried out. glass Glass melt of the following composition, weightL: SiOg 72.0; A1, 0, 1.8; Fe., OjO, U CaO 6.8; MgO D, 0; 13.7; KjO 1,2; SO 0.4; cook at maximum temperature.

The distribution of fuel in the burners in different zones of the furnace is given in table. one.

In the process of testing the method, the adjustment interval is varied - the frequency of fuel consumption adjustment for the burners of the melting and clarification zone and on the last pair of burners is from 4.5 to 21 minutes.

The total change in fuel consumption at the burners of the melting and clarification zone based on the results of simultaneous measurement of the glass melt temperatures in the cooking basin of the stove (in 1414, 920.428.35 30.55 5.8

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The small pocket of between 1 and 2 para burners and the temperature maximum maximum is quantitatively estimated to vary from 60 to 80 m / h. On the last pair of burners, the fuel consumption is: va vary from 11 to 21 according to the degree of change in glass melt temperatures in the cooking and student basins of the furnace.

E (} x}) the efficiency of the method of glass melting is estimated by the quality of the glass, the capacity of the furnace according to the welded glass mass, the coefficient exf) of the glass mass reduction and the saving of fuel consumption.

A comparison of the known and proposed method of melting glass is given in table. 2 and 3. It follows from the tables that the best results are obtained when changing the total fuel consumption on the burners of the melting and clarification zone within 60-80 m / h, and on the last pair of burners when changing the fuel consumption within 10-20 m / h adjustment interval of 4.5-15 minutes.

The tests carried out show that the proposed method of glass melting provides for a 2-3% increase in furnace productivity, an increase in the yield of glass of 1st grade by 1.5-2.0%, an increase in EIS by 1-2%, fuel economy by 2-3, five%.

The expected annual economic effect in the implementation of the proposed method of glass melting on only one glass-melted bathtub will amount to 100 thousand rubles.

 Table 1

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0.035-0.055 80-120

 The fuel consumption adjustment is carried out when the furnace output is varied according to the welded glass mass and the charge-to-weight ratio.

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Claims (2)

1. METHOD FOR GLASS BREWING in a glass melting bath of a regenerative furnace by loading the charge and battle, melting, clarifying, homogenizing, studio and producing molten glass, distributing heat loads over the burners of the furnace with a maximum above the clarification zone, measuring the temperature of the molten glass in the cooking pool and regulating the loads in the melting zone and the last pair of burners, which is characterized by the fact that, in order to increase productivity, improve glass quality and save fuel, additional heat control ovyh loads of the burners melting and refining zones interval 0.15-0.5 duration period translation direction of the flame, the burners of the gas flow is changed in the range of 0.01-0.05 for total furnace fuel consumption. 2. The method of pop. 1, characterized in that the gas flow rate for the last pair of burners is changed within the range of 0.005-0.01 of the total fuel consumption on the remaining burners with an interval of 0.15-0.5 duration of the period of translation of the direction of the flame. SU ... 1237642