CN114671592A - Method for intelligently controlling melting temperature field of glass melting furnace - Google Patents
Method for intelligently controlling melting temperature field of glass melting furnace Download PDFInfo
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- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/24—Automatically regulating the melting process
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Abstract
The invention relates to the technical field of float glass production and manufacturing, in particular to a method for intelligently controlling a melting temperature field of a glass melting furnace. The method comprises the following steps of S1, adjusting the fuel quantity of each small furnace at the same time by controlling the total fuel quantity; adjusting the fuel proportion distribution of each small furnace until the melting temperature field of the glass melting furnace is stable; step S2, acquiring the hot spot temperature change of the glass melting furnace, and adjusting the total fuel amount according to the hot spot temperature change; when the hot spot temperature is reduced, the total fuel amount is increased; decreasing the total fuel amount when the hot spot temperature increases; step S3, acquiring the moving direction of the bubble boundary line, and adjusting the total fuel quantity according to the temperature change of the hot spot and the moving direction of the bubble boundary line; when the temperature of the hot spot is reduced, the bubble boundary line moves towards the direction of the feed inlet, and the total fuel amount is reduced; as the hot spot temperature increases, the bubble boundary moves toward the fining zone, increasing the total fuel.
Description
Technical Field
The invention relates to the technical field of float glass production and manufacturing, in particular to a method for intelligently controlling a melting temperature field of a glass melting furnace.
Background
With the wide application of intelligent technology in the traditional manufacturing industry, the intellectualization of glass manufacturing is imperative, the glass melting furnace is the heart of glass production, and the control of the melting temperature field of the melting furnace is the core and is also a difficult point. In float glass production, the control of a melting furnace system emphasizes that 'temperature stability, furnace pressure stability, liquid level stability, stockpile and bubble boundary line stability', in order to realize operability, the system is designed into a plurality of subsystems, such as a furnace pressure control system and a liquid level control system, intelligent control can be realized, while the temperature field control and stockpile bubble boundary line control do not realize intelligent control, manual operation is needed, the method is more original by depending on experience field observation and judgment, and the labor intensity is high.
The control of the melting temperature field of the glass melting furnace in the prior art mainly comprises two modes. The first mode is a fuel proportion control mode, fuel is distributed according to the proportion according to the role of each small furnace in the glass melting process, and the stability of a temperature field is realized by manually adjusting the total amount of the fuel. The method has the advantages that the fuel quantity is not required to be added or reduced independently for each small furnace, the operation is simple, and the defects that the judgment of an operator on a temperature field is relied on, the operator needs to observe the temperature field by experience, and the closed-loop feedback intelligent control cannot be realized. And in the temperature control mode, the main crown top temperature points corresponding to the small furnaces are respectively selected as key temperature points to be controlled, each small furnace independently adjusts fuel, and temperature stabilization is realized, namely, a single small furnace forms an independent temperature control subsystem. With the temperature control mode, closed-loop control of the temperature and the fuel amount per small furnace can be realized, but the fuel amount fluctuates greatly in a short time.
In order to realize intelligent control, the two control modes are combined, and the total fuel amount is adjusted according to the temperature of a certain small furnace as the key point temperature. Although intelligent control can be achieved, there arises a problem that the melting temperature fluctuates widely.
Disclosure of Invention
The invention aims to: the method combines a temperature control mode and a bubble boundary control mode to control the total amount of the fuel by considering the influence of the movement of the bubble boundary on the temperature control mode, reduces the fluctuation of the melting temperature, is beneficial to realizing intelligent control and achieves the stability of the glass melting process.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for intelligently controlling a melting temperature field of a glass melting furnace comprises the following steps,
step S1, adjusting the fuel quantity of each small furnace by controlling the total fuel quantity; adjusting the fuel proportion distribution of each small furnace until the melting temperature field of the glass melting furnace is stable; at the moment, the hot spot temperature is a standard temperature, and the bubble boundary position is a standard position;
step S2, acquiring the hot spot temperature change of the glass melting furnace, and adjusting the total fuel amount according to the hot spot temperature change;
when the hot spot temperature is reduced, the total fuel amount is increased;
decreasing the total fuel amount as the hot spot temperature increases;
step S3, acquiring the moving direction of the bubble boundary line, and adjusting the total fuel amount according to the hot spot temperature change and the moving direction of the bubble boundary line;
when the temperature of the hot spot is reduced, the bubble boundary line moves towards the direction of the feed opening, and the total fuel amount is reduced;
as the hot spot temperature increases, the bubble boundary moves toward the fining zone, increasing the total fuel.
Firstly, a stable melting temperature field is obtained in a fuel proportion control mode; and then combining the temperature control mode with the fuel proportion control mode to realize the closed-loop feedback control of the hot spot temperature and the total fuel quantity. When the total amount of fuel is adjusted according to the change of the hot spot temperature, the problem that the fuel fluctuates greatly in a short time still exists because the temperature change of the melting furnace brought by the fuel adjustment cannot be reflected to the hot spot temperature in time.
The inventors have found that the movement of the bubble boundary line also has a large effect on the variation of the hot spot temperature. Taking the hot spot temperature decrease as an example, when the hot spot temperature decreases and the total amount of fuel is increased, the monitored hot spot temperature still decreases, and the temperature increase caused by the total amount of fuel is not timely brought to the increase of the hot spot temperature. This is mainly because the bubble boundary line moves towards the dispensing opening, resulting in a reduction of the hot spot temperature. Therefore, although the hot spot temperature is reduced, the total fuel amount still needs to be reduced to restore the bubble boundary to the standard position, so as to eliminate the influence of the movement of the bubble boundary on the hot spot temperature, and maintain good closed-loop feedback of the total fuel amount and the hot spot temperature.
The prior art controls the fuel quantity of each small furnace through the hot spot temperature of the small furnace. The specific control program parameters are all in the prior art. The hot spot temperature and total fuel quantity are closed loop regulated in step S2 using prior art procedures. The hot spot temperature is the temperature of a fixed measuring point in the melting furnace, and a crown temperature point corresponding to a certain port is usually selected as the hot spot temperature. The hot spot temperature is primarily related to the fuel calorific value, feedstock moisture and ambient temperature.
The boundary between the foam region and the interfacial region in the glass melting furnace is a bubble boundary. The position of the bubble boundary line is related to the composition of the raw material and the redox performance of the raw material. Under the stable state of the melting temperature field, the position of the boundary line of the material pile and the bubble is stable, and the melting condition is good.
As a preferable aspect of the present invention, in step S3, the hot spot temperature drop occurs after the total amount of fuel is increased; the hot spot temperature rise occurs after the total fuel amount is reduced.
As a preferable aspect of the present invention, in step S3, after the bubble boundary line returns to the standard position, the total amount of fuel is adjusted according to the hot spot temperature change.
In a preferred embodiment of the present invention, in step S2, the temperature change at the crown temperature point corresponding to the port is used as the temperature change of the melting furnace.
As a preferable scheme of the invention, the main arch temperature point is a main arch temperature point corresponding to a 3# port, a 4# port or a 5# port.
When the moving direction of the bubble boundary line is judged, a mode of manually observing from an observation port of the side breast wall can be adopted, and a mode of taking a picture and then comparing the picture by a person or a machine can also be adopted.
As a preferable aspect of the present invention, the moving direction of the bubble boundary line is obtained by a manual observation.
As a preferable aspect of the present invention, the moving direction of the bubble boundary line is obtained by:
acquiring an image of the bubble boundary line when the bubble boundary line is positioned at a standard position as a standard image, and acquiring an image of the bubble boundary line in the operation of the glass melting furnace as a contrast image; comparing the standard image with the comparison image to obtain the moving direction of the bubble boundary line.
A system for intelligently controlling a melting temperature field of a glass melting furnace comprises a temperature sensor, a bubble boundary monitoring device, a control device and an adjusting device;
the temperature sensor is electrically connected with the control device and sends a temperature signal to the control device; the bubble boundary line monitoring device is electrically connected with the control device and sends a bubble boundary line position signal to the control device;
the control device comprises a temperature control module, a bubble boundary line module and a judgment module;
the temperature control module receives a temperature signal of the sensor, and sends a first reduction signal to the judgment module when judging that the temperature rises; if the temperature is judged to be reduced, a first increasing signal is sent to the judging module;
the bubble boundary line module receives a bubble boundary line position signal of the bubble boundary line monitoring device, and sends a second reduction signal when the bubble boundary line moves towards the direction of the feed port; if the bubble boundary moves towards the clarification area, a second increasing signal is sent out;
the judging module
When receiving the first reduction signal and the second reduction signal, taking the first reduction signal as an execution signal;
when receiving the first increasing signal and the second increasing signal, taking the first increasing signal as an executing signal;
when receiving the first increasing signal and the second decreasing signal, taking the second decreasing signal as an execution signal;
when receiving the first decreasing signal and the second increasing signal, taking the second increasing signal as an execution signal;
and the adjusting device receives the execution signal of the judging module and adjusts the total fuel amount of the melting furnace.
As a preferable scheme of the invention, the glass melting furnace comprises a fuel main pipe and a plurality of fuel branch pipes connected with the fuel main pipe; each fuel branch pipe is connected with a burner of the corresponding small furnace; each fuel branch pipe is provided with a branch pipe valve; the fuel main pipe is provided with a main valve;
the adjusting device is connected with the main valve and used for controlling the opening degree of the main valve.
A glass melting furnace comprises the intelligent control system for the melting temperature field.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the method for intelligently controlling the melting temperature field of the glass melting furnace firstly obtains a stable melting temperature field in a fuel proportion control mode, and then is combined with a temperature control mode to realize closed-loop feedback control of hot spot temperature and total fuel amount and realize intelligent control. The fuel amount adjustment cannot reflect the defect of the hot spot temperature in time, and when the bubble boundary line moves, the temperature control mode is adjusted in time to reduce the fuel fluctuation. In different stages, the advantages of the fuel proportion control mode, the temperature control mode and the bubble boundary line control mode are respectively exerted. The intelligent control of the melting temperature field is favorably realized, and the large-amplitude fluctuation of the fuel is avoided.
2. The method for intelligently controlling the melting temperature field of the glass melting furnace or the system obtained according to the method can utilize the existing control mode in the equipment in the process of modifying the glass melting furnace, and is easy to upgrade and modify the existing equipment.
Drawings
FIG. 1 is a schematic view of the structure of a glass melting furnace.
1-a feeding port; 2-a melting zone; 3-a clarification zone; small furnace No. 21-1; 22-2# small furnace; small furnace No. 23-3; a 24-4# small furnace; 25-5# small furnace;
FIG. 2 is a schematic view of a system for intelligent control of the melting temperature field of the glass melting furnace of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A method for intelligently controlling a melting temperature field of a glass melting furnace comprises the following steps,
step S1, adjusting the fuel quantity of each small furnace by controlling the total fuel quantity; adjusting the fuel proportion distribution of each small furnace until the melting temperature field of the glass melting furnace is stable; at the moment, the hot spot temperature is a standard temperature, and the bubble boundary position is a standard position;
step S2, acquiring the hot spot temperature change of the glass melting furnace, and adjusting the total fuel amount according to the hot spot temperature change;
when the hot spot temperature is reduced, the total fuel amount is increased;
decreasing the total fuel amount as the hot spot temperature increases;
in general, the temperature change of the crown temperature point corresponding to the port is taken as the temperature change of the melting furnace. The main arch temperature point is a main arch temperature point corresponding to a 3# port, a 4# port or a 5# port. The main crown temperature point is upstream of the bubble boundary line.
As shown in figure 1, the glass melting furnace main body comprises a feeding port 1, a melting zone 2 and a clarification zone 3 which are connected in sequence, and comprises a small furnace 1# 21, a small furnace 2# 22, a small furnace 3# 23, a small furnace 4# 24 and a small furnace 5# 25. The prior art controls the fuel quantity of each small furnace through the hot spot temperature of the small furnace. The specific control program parameters are all in the prior art. Closed loop control of the hot spot temperature and total fuel quantity is performed in step S2 using prior art procedures. The temperature of a fixed measuring point in the hot spot temperature melting furnace is generally selected as the hot spot temperature from a crown temperature point corresponding to a certain port. The hot spot temperature is primarily related to the fuel calorific value, feedstock moisture and ambient temperature.
The boundary between the foam region and the interfacial region in the glass melting furnace is a bubble boundary. The position of the bubble boundary line is related to the composition of the raw material and the redox performance of the raw material. Under the stable state of the melting temperature field, the position of the boundary line of the material pile and the bubble is stable, and the melting condition is good.
Step S3, acquiring the moving direction of the bubble boundary line, and adjusting the total fuel amount according to the hot spot temperature change and the moving direction of the bubble boundary line;
when the temperature of the hot spot is reduced, the bubble boundary line moves towards the direction of the feed opening, and the total fuel amount is reduced;
as the hot spot temperature increases, the bubble boundary moves toward the fining zone, increasing the total fuel.
Firstly, a stable melting temperature field is obtained in a fuel proportion control mode; and then combining the temperature control mode with the fuel proportion control mode to realize the closed-loop feedback control of the hot spot temperature and the total fuel quantity. When the total amount of fuel is adjusted according to the change of the hot spot temperature, the problem that the fuel fluctuates greatly in a short time still exists because the temperature change of the melting furnace brought by the fuel adjustment cannot be reflected to the hot spot temperature in time.
The inventors have found that the movement of the bubble boundary line also has a large effect on the variation of the hot spot temperature. Taking the hot spot temperature decrease as an example, when the hot spot temperature decreases and the total amount of fuel is increased, the monitored hot spot temperature still decreases, and the temperature increase caused by the total amount of fuel is not timely brought to the increase of the hot spot temperature. This is mainly because the bubble boundary line moves towards the dispensing opening, resulting in a reduction of the hot spot temperature. Therefore, although the hot spot temperature is reduced, the total fuel amount still needs to be reduced to restore the bubble boundary to the standard position, so as to eliminate the influence of the movement of the bubble boundary on the hot spot temperature, and maintain good closed-loop feedback of the total fuel amount and the hot spot temperature.
In step S3, the hot spot temperature drop occurs after increasing the total fuel amount; the hot spot temperature rise occurs after the total fuel amount is reduced. In step S3, after the bubble boundary line returns to the standard level, the total amount of fuel is adjusted according to the change of the hot spot temperature.
When the moving direction of the bubble boundary line is judged, a mode of manually observing from an observation port of the side breast wall can be adopted, and a mode of taking a picture and then comparing the picture by a person or a machine can also be adopted.
The direction of movement of the bubble boundary line is obtained by: acquiring an image of the bubble boundary line when the bubble boundary line is positioned at a standard position as a standard image, and acquiring an image of the bubble boundary line in the operation of the glass melting furnace as a contrast image; comparing the standard image with the comparison image to obtain the moving direction of the bubble boundary line.
Because when the melting furnace is stably produced, the bubble boundary line is stable in one week or more, and fuel addition and subtraction are not needed.
Closed loop and automatic control of hot spot temperature and total fuel amount is achieved even by means of manual observation.
In the process of modifying the melting furnace, the method can be implemented by utilizing the devices and facilities used in the existing fuel proportion control mode or temperature control mode and only adjusting the parameters and modifying the pipeline for supplying fuel, thereby being beneficial to the upgrading and modification of the existing melting furnace equipment.
Example 2
A system for intelligently controlling a melting temperature field of a glass melting furnace is shown in figure 2 and comprises a temperature sensor, a bubble boundary monitoring device, a control device and an adjusting device;
the temperature sensor is electrically connected with the control device and sends a temperature signal to the control device; the bubble boundary line monitoring device is electrically connected with the control device and sends a bubble boundary line position signal to the control device;
the control device comprises a temperature control module, a bubble boundary line module and a judgment module;
the temperature control module receives a temperature signal of the sensor, and sends a first reduction signal to the judgment module when judging that the temperature rises; if the temperature is judged to be reduced, a first increasing signal is sent to the judging module;
the bubble boundary line module receives a bubble boundary line position signal of the bubble boundary line monitoring device, and sends a second reduction signal when the bubble boundary line moves towards the direction of the feed port; if the bubble boundary moves towards the clarification area, a second increasing signal is sent out;
the judging module is used for judging whether the current time is short,
when receiving the first reduction signal and the second reduction signal, taking the first reduction signal as an execution signal;
when receiving the first increasing signal and the second increasing signal, taking the first increasing signal as an executing signal;
when receiving the first increasing signal and the second decreasing signal, taking the second decreasing signal as an executing signal;
when receiving the first decreasing signal and the second increasing signal, taking the second increasing signal as an executing signal;
and the adjusting device receives the execution signal of the judging module and adjusts the total fuel amount of the melting furnace.
The glass melting furnace comprises a fuel main pipe and a plurality of fuel branch pipes connected to the fuel main pipe; each fuel branch pipe is connected with the burner of the corresponding small furnace; each fuel branch pipe is provided with a branch pipe valve; the fuel main pipe is provided with a main valve;
the adjusting device is connected with the main valve and used for controlling the opening degree of the main valve.
Example 3
A glass melting furnace comprising the intelligent melting temperature field control system of embodiment 2.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A method for intelligently controlling a melting temperature field of a glass melting furnace is characterized by comprising the following steps,
step S1, adjusting the fuel quantity of each small furnace by controlling the total fuel quantity; adjusting the fuel proportion distribution of each small furnace until the melting temperature field of the glass melting furnace is stable;
step S2, acquiring the hot spot temperature change of the glass melting furnace, and adjusting the total fuel amount according to the hot spot temperature change;
when the hot spot temperature is reduced, the total fuel amount is increased;
decreasing the total fuel amount as the hot spot temperature increases;
step S3, acquiring the moving direction of the bubble boundary line, and adjusting the total fuel amount according to the hot spot temperature change and the moving direction of the bubble boundary line;
when the temperature of the hot spot is reduced, the bubble boundary line moves towards the direction of the feed opening, and the total fuel amount is reduced;
as the hot spot temperature increases, the bubble boundary moves toward the fining zone, increasing the total fuel.
2. The method for intelligently controlling a melting temperature field of a glass melting furnace according to claim 1, wherein in step S3,
the hot spot temperature drop occurs after increasing the total fuel amount;
the hot spot temperature rise occurs after the total fuel amount is reduced.
3. The method of claim 2, wherein in step S3, after the bubble boundary line returns to the standard level, the total amount of fuel is adjusted according to the hot spot temperature change.
4. The method of claim 1, wherein in step S2, the temperature change of the crown temperature point corresponding to the crown is used as the temperature change of the melting furnace.
5. The method for intelligently controlling a melting temperature field of a glass melting furnace as claimed in claim 4, wherein the crown temperature point is a crown temperature point corresponding to a 3# port, a 4# port or a 5# port.
6. The method of claim 1, wherein the direction of the bubble boundary line is obtained by manual observation.
7. The method of claim 1, wherein the direction of movement of the bubble boundary line is obtained by:
acquiring an image of the bubble boundary line when the bubble boundary line is positioned at a standard position as a standard image, and acquiring an image of the bubble boundary line in the operation of the glass melting furnace as a contrast image; comparing the standard image with the comparison image to obtain the moving direction of the bubble boundary line.
8. A system for intelligently controlling a melting temperature field of a glass melting furnace is characterized by comprising a temperature sensor, a bubble boundary monitoring device, a control device and an adjusting device;
the temperature sensor is electrically connected with the control device and sends a temperature signal to the control device; the bubble boundary line monitoring device is electrically connected with the control device and sends a bubble boundary line position signal to the control device;
the control device comprises a temperature control module, a bubble boundary line module and a judgment module;
the temperature control module receives a temperature signal of the sensor, and sends a first reduction signal to the judgment module when judging that the temperature rises; if the temperature is judged to be reduced, a first increasing signal is sent to the judging module;
the bubble boundary line module receives a bubble boundary line position signal of the bubble boundary line monitoring device, and sends a second reduction signal when the bubble boundary line moves towards the direction of the feed port; if the bubble boundary moves towards the clarification area, a second increasing signal is sent out;
the judging module is used for judging whether the received signal is a signal,
when receiving the first reduction signal and the second reduction signal, taking the first reduction signal as an execution signal;
when receiving the first increasing signal and the second increasing signal, taking the first increasing signal as an executing signal;
when receiving the first increasing signal and the second decreasing signal, taking the second decreasing signal as an execution signal;
when receiving the first decreasing signal and the second increasing signal, taking the second increasing signal as an executing signal;
and the adjusting device receives the execution signal of the judging module and adjusts the total fuel amount of the melting furnace.
9. The intelligent control system for the melting temperature field of a glass melting furnace according to claim 8,
the glass melting furnace comprises a fuel main pipe and a plurality of fuel branch pipes connected to the fuel main pipe; each fuel branch pipe is connected with a burner of the corresponding small furnace; each fuel branch pipe is provided with a branch pipe valve; the fuel main pipe is provided with a main valve;
the adjusting device is connected with the main valve and used for controlling the opening degree of the main valve.
10. A glass melting furnace comprising the intelligent melting temperature field control system of claim 8 or 9.
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| CN210481189U (en) * | 2019-09-11 | 2020-05-08 | 成都南玻玻璃有限公司 | Mixed combustion-supporting glass melting furnace |
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2022
- 2022-04-24 CN CN202210434372.XA patent/CN114671592B/en active Active
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| WO2002048057A1 (en) * | 2000-12-14 | 2002-06-20 | Software & Technologie Glas Gmbh Cottbus | Method for measurement and control of quality-determining parameters for the raw smelt in glass furnaces |
| CN109437515A (en) * | 2018-11-28 | 2019-03-08 | 乔治洛德方法研究和开发液化空气有限公司 | A kind of method of foam position on regulation glass melt surface |
| CN109489768A (en) * | 2018-11-28 | 2019-03-19 | 乔治洛德方法研究和开发液化空气有限公司 | Monitor the system and method and glass furnace of foam line position on glass melt surface |
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