Method for improving production efficiency of ultra-white photovoltaic rolled glass

Abstract

The invention relates to a method for improving the production efficiency of ultra-white photovoltaic rolled glass, which comprises the following steps of: designing a temperature regulation device, the distance l of burning guns, the use number b and the moving position of the burning guns, and the flow phi 1 and the flow phi 2 of the burning guns; the temperature testing system is used for detecting the transverse temperature of the molten glass at the dcm (d > = 0) position before the molten glass enters the calendering roller, and the PLC control system is connected with the temperature testing system, the temperature regulation and control system, the alarm, the signal lamp and the like for signal testing, transmission and processing, so that the abnormal transverse temperature of the molten glass at the dcm (d > = 0) position before the calendering roller is accurately and quickly controlled; the using number b of the heating device burning guns, the moving position and the flow phi 1 and phi 2 of natural gas of each burning gun achieve transverse temperature regulation and control of molten glass entering the position dcm away from the calendering roller, generation of cold molten glass and generation of devitrification materials are reduced, and the problems of edge damage and thickness difference of the cold glass are reduced from the source.

Description

Technical Field

[0001] The invention belongs to the technical field of ultra-white photovoltaic glass production, and in particular relates to a method for improving the production efficiency of ultra-white photovoltaic rolled glass. Background Art

[0002] The production process of ultra-white rolled glass is that the glass raw materials are melted in the melting furnace, flow out through the overflow port, and then pressed by the calender. In the molding process, calender rollers, lip bricks and side bricks are required. The thickness of the glass is controlled by adjusting the gap between the upper and lower calender rollers, and the width of the plate is controlled by controlling the distance of the side bricks. The glass coming out of the calender roller will increase the width of the cut edge glass ribbon due to too much cold glass ribbon on the edge, resulting in increased edge loss; the glass ribbon coming out of the calender roller will be thin in the middle and thick on both sides due to the lower temperature of the edge glass liquid than the middle temperature glass liquid, resulting in an increase in the thickness difference. At present, the process adjustment for the thickness difference and edge loss control caused by cold glass on the edge is mainly carried out by the cold end staff to test and calculate the thickness and cutting width, and then feed back the data to the process adjustment personnel. The process adjustment personnel make adjustments based on experience. Adjustments are made after the thickness difference exceeds the standard and the edge loss exceeds the allowable value. The invalid operation time is long and the adjustment cycle is long. Summary of the invention

[0003] The purpose of the present invention is to provide a method for improving the production efficiency of ultra-white photovoltaic rolled glass. The method can reduce the generation of cold glass liquid and the generation of crystallization material in the glass liquid, thereby realizing automatic adjustment to reduce edge loss, reduce the temperature difference between the middle and the edge of the glass plate, thereby alleviating the generation of thickness difference, and control the edge loss caused by more cold glass and the thickness difference caused by the temperature difference of the glass liquid before they occur, thereby reducing invalid operation time and improving the production efficiency of the enterprise.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: A method for improving the production efficiency of ultra-white photovoltaic rolled glass comprises the following steps: S1. The temperature testing system installed at d (d ≥ 0) cm (the length of the tangent line of the outer edge of the calendering roller pushed outward from the kiln head) before entering the calendering roller tests the transverse temperature of the glass liquid at d cm before entering the calendering roller, determines the temperature △t value, the position of △t ≥ △T and the actual length L, and transmits the △t value (the change after temperature Tmin), the position of △t ≥ △T (allowable temperature difference) (△T ≥ 0) and the actual length L (transverse interval) to the PLC control system, signal light and alarm; S2, the PLC control system starts the temperature control system installed in the upper space of the lip brick before the calendering roller according to the color of the signal light that needs to start the temperature control system; S3, when |△t| is less than △T, the △t-position curve is black, the signal light is green, the alarm does not sound, the PLC control system receives the signal transmitted by the temperature detection system, the signal light and the alarm, and the temperature control system does not work; S4. When △t is positive and |△t| is greater than △T, the curve segment in the △t-position curve where △t is positive and |△t| is greater than △T turns red and flashes, and the position and actual length L of the red flashing segment are given, the signal light turns red, and the alarm sounds; the PLC control system starts the heating system of the temperature control system according to the received signal light color, △t value, position where |△t|≥△T and actual length L; the heating system arranges the burner according to the received △t value, position where |△t|≥△T and actual length L transmitted by the PLC control system, until the temperature test system detects |△t|≤△T again; S5. When △t is a negative value and |△t|>△T, the alarm sounds, the signal light turns yellow, and the △t-position |△t|≥△T position curve segment turns yellow and flashes. At this time, the PLC control system starts the temperature control system and the cooling system. The cooling system uses a water cooling or air cooling system and can be controlled in different areas to cool the corresponding position until the temperature at the corresponding position drops to |△t|≤△T.

[0005] Further, in step S4, the arrangement method of the burner guns is that the burner gun spacing in the heating system can be set to l (l ≥ 20 cm), the system is arranged according to the value of L / l = w, the burner gun is located at the midpoint of each l, the number of the burner guns is the integer part b of w, and the heating area from the 1st to the b-1th burner gun is S1 = 1 / 4πl 2 The volume of the glass liquid that needs to be heated within the time interval T is approximately V 1 =l*v 玻璃 *T*h, according to the law of conservation of energy, the temperature system calculates the flow rate of natural gas as Among them, v 玻璃 is the speed of the glass liquid flowing to the calendering roller, C p is the isobaric specific heat of the glass liquid, ρ is the density of the glass liquid, h is the height of the glass liquid, q is the calorific value of natural gas, k is a constant related to the heat utilization rate (k ≥ 0), which can be set in the heating system, T is the time interval for the temperature detection system to test △t (which can be set in the temperature test system); the control area of ​​the bth burner is S 2 =1 / 4π(l+cl)2, c is the fractional part of w, V 2 =(l+cl)*v 玻璃 *T*h, natural gas flow rate

[0006] Furthermore, the temperature control device executes the calculation results of the heating system to adjust the number of burners b, the position distribution and the flow rate of the burners. and Control and adjust the temperature of the corresponding position so that the temperature adjustment system stops working when △t≤△T detected by the temperature testing system again.

[0007] Furthermore, the temperature control system is used to control the temperature of the glass liquid at dcm (d≥0) before entering the calendering roller, including a heating system and a cooling system, the heating system is used to increase the temperature, and the cooling system is used to reduce the temperature; wherein, the heating system involves a temperature control device, the temperature control device is located in the upper space of the lip brick before the calendering roller, spanning above the glass liquid at dcm (d≥0) before entering the calendering roller, and the temperature control device includes a bracket, a trolley, a crossbeam, a flame gun, and a flow meter; the bracket is welded to the trolley, the trolley can move freely or be fixed, the bracket can be extended and retracted up and down, there is a crossbeam at the top of the bracket, the crossbeam is in the form of a slide rail, and n flame guns (n≥1) are arranged on the beam, each flame gun is independently controlled, can achieve 180-degree angle spraying, and can slide freely laterally along the slide rail.

[0008] Furthermore, a flow meter is installed on each burn gun, and the flow meter is connected to the PLC control system; the temperature test system is connected to the signal light, and the temperature test system is connected to the alarm; the signal light is connected to the PLC control system, the alarm is connected to the PLC control system, and the temperature control system is connected to the PLC control system.

[0009] The PLC control system can perform manual and automatic switching for the control of the temperature test system and the adjustment of the temperature control system. When the manual button is not started, automatic operation is performed.

[0010] The beneficial effects of the present invention are as follows: the present invention provides a method for improving the production efficiency of ultra-white photovoltaic rolled glass; the method designs a temperature control device, a spacing l between the burners, a number b of burners used, a moving position, and a flow rate of the burners. and Combined with the temperature test system to detect the transverse temperature of the glass liquid at dcm (d≥0) before entering the calendering roller, and the PLC control system to connect the temperature test system, temperature control system, alarm, signal light, etc. to perform signal testing, transmission and processing; accurately and quickly control the number b of the burners used by the heating device, the moving position, and the flow rate of natural gas for each burner when the transverse temperature of the glass liquid at dcm (d≥0) before the calendering roller is abnormal and Realize the lateral temperature control of the glass liquid at the dcm before entering the calendering roller; reduce the generation of cold glass liquid and crystallization material, reduce the edge loss and thickness difference problems of cold glass from the source; reduce invalid operation time and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a control flow chart of the present invention; Figure 2 It is a structural diagram of the temperature control system in the present invention; Figure 3 It is a schematic diagram of the temperature control device in the present invention; The numbers in the figure are: 1-trolley; 2-lifting rod; 3-crossbeam; 4-fire gun; 5-slide rail; 6-glass liquid on the upper part of the lip brick; 7-lip brick. DETAILED DESCRIPTION

[0012] Specific embodiment 1: The technical scheme of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention. It should be noted that: in the present invention, if there is no special description, all the embodiments and preferred implementation methods mentioned herein can be combined with each other to form a new technical scheme. In the present invention, if there is no special description, all the technical features and preferred features mentioned herein can be combined with each other to form a new technical scheme. The "scope" disclosed in the present invention is in the form of lower limit and upper limit, which can be one or more lower limits, and one or more upper limits respectively. In the present invention, unless otherwise specified, each reaction or operation step can be carried out sequentially or in sequence.

[0013] As the specification of the present invention Figure 1 As shown, the present invention provides a method for improving the production efficiency of ultra-white photovoltaic rolled glass by designing a temperature control device, a spacing l between the burners, a number b of burners used, a moving position, and a flow rate of the burners. and Combined with the temperature test system to detect the transverse temperature of the glass liquid at dcm (d≥0) before entering the calender roller, and the PLC control system to connect the temperature test system, temperature control system, alarm, signal light, etc. to perform signal testing, transmission and processing. Accurately and quickly control the number of burners b, the moving position and the flow rate of natural gas for each burner when the transverse temperature of the glass liquid at dcm (d≥0) before the calender roller is abnormal. and It can realize automatic control of the lateral temperature of the glass liquid at the dcm before entering the calendering roller, reduce production problems such as edge loss and thickness difference caused by temperature fluctuation of the glass liquid, and control the occurrence of problems from the source, reduce invalid operation time and improve production efficiency. When used in specific work, the temperature testing system installed at dcm (d≥0) before entering the calendering roller tests the lateral temperature of the glass liquid at dcm before entering the calendering roller. The specific testing method is: the temperature difference △t is tested at a time interval of Tmin (T≥0, T can be set), and the temperature testing system is provided with a temperature standard deviation value △T (△T≥0). The temperature detection system automatically compares the size of △t and △T, and displays the temperature difference △t, the corresponding position and actual length L of |△t|≥△T, and transmits them to the signal light, alarm and PLC control system; the PLC control system starts the temperature control system (temperature control system) installed in the upper space of the lip brick before the calendering roller according to the color of the signal light; the PLC control system determines the position of the fire gun, the number b of the fire guns used and the amount of natural gas used by the fire gun according to the color of the received signal light, the corresponding position of the temperature difference |△t|≥△T and the actual length L and The signal is transmitted to the temperature control system, which starts the temperature control device and executes the number of burners b, the moving position and the flow rate of natural gas for each burner and The temperature of the glass liquid at the dcm before entering the calendering roller is regulated; the details are as follows: When |△t| is less than △T, the signal light is green, the alarm does not sound, and the temperature control system does not work; When △t is positive and |△t| is greater than △T, the alarm sounds, the signal light turns red, the curve segment with a larger temperature value of the △t-position curve turns red and flashes, and the actual position and length corresponding to the curve segment are displayed. The PLC control system starts the heating system of the temperature control system according to the color of the received signal light, and transmits the △t value, the position of △t≥△T and the actual length L to the heating system. The heating system arranges the firing guns. The spacing between the firing guns can be set to l (l≥20cm). The system is arranged according to the value of L / l=w. The firing guns are located at the midpoint of each l. The number of firing guns is the integer part b of w, and the heating area of ​​the 1st to b-1th firing guns is S1=1 / 4πl2. The volume of the glass liquid that needs to be heated within the time interval T is approximately V 1 =l*v 玻璃 *T*h, according to the law of conservation of energy, the temperature system calculates the flow rate of natural gas as Among them, Vglass is the speed of glass liquid flowing to the calendering roller, C pis the isobaric specific heat of the glass liquid, ρ is the density of the glass liquid, h is the height of the glass liquid, q is the calorific value of natural gas, k is a constant related to the heat utilization rate (k≥0), T is the time interval of the temperature detection system to test △t, which can be set in the heating system, and the control area of ​​the bth burner is S 2 =1 / 4π(l+cl)2, c is the fractional part of w, V 2 =(l+cl)*v 玻璃 *T*h, natural gas flow rate The temperature control device executes the calculation results of the heating system and adjusts the number of burners, position distribution and flow rate of the burners. and Control the temperature at the corresponding position to make |△t|≤△T so that the temperature adjustment system stops working; When △t is negative and |△t|>△T, the alarm sounds, the signal light turns yellow, and the segment |△t|>△T of the △t-position curve turns yellow and flashes. At this time, the PLC control system starts the temperature control system and the cooling system, and the temperature at the corresponding position drops to |△t|≤△T; The temperature control system is used to control the temperature of the glass liquid at dcm (d≥0) before entering the calendering roller, and includes a heating system and a cooling system. The heating system is used to increase the temperature, and the cooling system is used to reduce the temperature. Among them, the heating system involves a temperature control device. The temperature control device is located in the upper space of the lip brick before the calendering roller and spans above the glass liquid at dcm (d≥0) before entering the calendering roller. The temperature control device includes a bracket, which is welded on a trolley. The bracket can be extended up and down. There is a scale at the top of the bracket. The scale is in the form of a slide rail. There are n (n≥1) torches arranged on the scale. Each torch is independently controlled and can achieve 180-degree angle spraying and can slide freely in the horizontal direction. Each torch is provided with a flow meter. The flow meter flow V is controlled by a manual input mode and an automatic control mode. The cooling system is used to cool the glass liquid at dcm before entering the calendering roller. Each flame gun is equipped with a flow meter, which is connected to the PLC control system; the PLC control system can switch between manual and automatic control of the temperature test system and the adjustment of the temperature control system. When the manual button is not activated, automatic operation is performed.

[0014] The specific implementation cases are as follows: A production line uses a temperature test system installed 5 cm before entering the calendering roller to test the lateral temperature of the glass liquid 5 cm before entering the calendering roller. The standard temperature difference △T is set to 5℃, and the test time interval T is 5min. The temperature difference is 8℃. The position of temperature △t≥△T and the actual length of 50cm are judged. The value △t=8℃, the position of △t≥△T and the actual length of 50cm are set. At this time, the alarm sounds, the signal light is red, and the PLC control system starts the temperature control system installed in the upper space of the lip brick before the calendering roller; the PLC control system sets the flame gun spacing l to 20cm, the density of the glass liquid to 2.5g / cm3, and the specific heat capacity C of the glass liquid p =0.791J / (℃.kg), vglass=12m / h, the calorific value of natural gas is q=3.8MJ / m3, the height of glass liquid h=30cm, then the number of starting fire guns is 50 / 20=2.5, the heating area of ​​the first and second fire guns is S1=1 / 4πl2=0.0314m2, the heating area of ​​the third fire gun is S2=1 / 4π(l+0.5l)2=0.07m2, the density of glass liquid is 2.5g / cm3, the specific heat capacity of glass liquid C p =0.791J / (℃.kg) The calorific value of natural gas is q=3.8*10 7 J / m 3 , take k as 2.5, natural gas flow The temperature control system starts the heating system according to the signals transmitted by PLC, signal lights, alarms and other information, and gives the number of burners used, location distribution and burner flow. and The temperature control device executes the calculation result of the temperature heating system, adjusts the temperature of the response position, and stops the temperature adjustment system when △t≤5℃; the use of this method reduces the generation of local cold glass liquid, realizes the automatic control of the horizontal and vertical temperatures of the glass liquid, and reduces the edge loss and thickness difference caused by cold glass from the source through the above steps. The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical content disclosed above to an equivalent embodiment of equivalent changes without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A method for improving the production efficiency of ultra-white photovoltaic rolled glass, characterized in that: The steps include: S1. A temperature testing system installed at the dcm before entering the calendering roller tests the transverse temperature of the glass liquid at the dcm before entering the calendering roller, determines the temperature △t value, the position of △t≥△T and the actual length L, and transmits the △t value, the position of △t≥△T (△T≥0) and the actual length L to the PLC control system, signal light and alarm; S2, the PLC control system starts the temperature control system installed in the upper space of the lip brick before the calendering roller according to the color of the signal light that needs to start the temperature control system; S3, when |△t| is less than △T, the △t-position curve is black, the signal light is green, the alarm does not sound, the PLC control system receives the signal transmitted by the temperature detection system, the signal light and the alarm, and the temperature control system does not work; S4. When △t is positive and |△t| is greater than △T, the curve segment in the △t-position curve where △t is positive and |△t| is greater than △T turns red and flashes, and the position and actual length L of the red flashing segment are given, the signal light turns red, and the alarm sounds; the PLC control system starts the heating system of the temperature control system according to the received signal light color, △t value, position where |△t|≥△T and actual length L; The heating system calculates the number of torches used and the flow rate of the torches according to the △t value, the position of |△t|≥△T and the actual length L transmitted by the PLC control system. and Arrangement is carried out until the temperature test system tests again and the value of |△t|≤△T; S5. When △t is a negative value and |△t|>△T, the alarm sounds, the signal light turns yellow, and the △t-position |△t|≥△T position curve segment turns yellow and flashes. At this time, the PLC control system starts the temperature control system and the cooling system. The cooling system adopts an air cooling system, which can be controlled in different areas to cool the corresponding positions until the temperature test system tests again that |△t|≤△T; in step S4, the arrangement method of the flame guns is that the flame gun spacing in the heating system can be set to l (l≥20cm), and the system is arranged according to the value of L / l=w. The flame guns are located at the midpoint of each l, and the number of flame guns is the integer part b of w, and the heating area of ​​the 1st to b-1th flame guns is S1=1 / 4πl 2 The volume of the glass liquid that needs to be heated within the time interval T is approximately V1 = l*v 玻璃 *T*h, according to the law of conservation of energy, the temperature system calculates the flow rate of natural gas as Among them, v 玻璃 is the speed of glass liquid flowing to the calendering roller, C p is the isobaric specific heat of the glass liquid, ρ is the density of the glass liquid, h is the height of the glass liquid, q is the calorific value of natural gas, k is a constant related to the heat utilization rate (k ≥ 0), which can be set in the heating system, T is the time interval for the temperature detection system to test △t (which can be set in the temperature test system), the control area of ​​the b-th burner is S2 = 1 / 4π(l+cl)2, c is the decimal part of w, V2 = (l+cl)*v 玻璃 *T*h, natural gas flow rate 2. A method for improving the production efficiency of ultra-white photovoltaic rolled glass according to claim 1, characterized in that: The temperature control device executes the calculation results of the heating system to adjust the number of burners b, the position distribution and the flow rate of the burners and Control and adjust the temperature of the corresponding position so that the temperature test system tests |△t|≤△T and the temperature adjustment system stops working.

3. A method for improving the production efficiency of ultra-white photovoltaic rolled glass according to claim 2, characterized in that: The temperature control system is used to control the temperature of the glass liquid at dcm (d≥0) before entering the calendering roller, and includes a heating system and a cooling system. The heating system is used to increase the temperature, and the cooling system is used to reduce the temperature. Among them, the heating system involves a temperature control device. The temperature control device is located in the upper space of the lip brick before the calendering roller and spans above the glass liquid at dcm (d≥0) before entering the calendering roller. The temperature control device includes a bracket, a trolley, a crossbeam, a flame gun, and a flow meter. The bracket is welded to the trolley, the trolley can move freely or be fixed, the bracket can be extended and retracted up and down, and there is a crossbeam at the top of the bracket. The crossbeam is in the form of a slide rail, and n flame guns (n≥1) are arranged on the scale. Each flame gun is independently controlled, can achieve 180-degree angle spraying, and can slide freely laterally along the slide rail.

4. A method for improving the production efficiency of ultra-white photovoltaic rolled glass according to claim 3, characterized in that: A flow meter is installed on each burner gun and is connected to a PLC control system.

5. The method for improving the production efficiency of ultra-white photovoltaic rolled glass according to claim 1, characterized in that: The PLC control system can perform manual and automatic switching for the control of the temperature test system and the adjustment of the temperature control system. When the manual button is not started, automatic operation is performed.

6. A method for improving the production efficiency of ultra-white photovoltaic rolled glass according to claim 1, characterized in that: The temperature testing system is connected to the signal light, and the temperature testing system is connected to the alarm; the signal light is connected to the PLC control system, the alarm is connected to the PLC control system, and the temperature control system is connected to the PLC control system.

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