CN117704837A - Heating furnace dew point value control method - Google Patents
Heating furnace dew point value control method Download PDFInfo
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- CN117704837A CN117704837A CN202311591483.2A CN202311591483A CN117704837A CN 117704837 A CN117704837 A CN 117704837A CN 202311591483 A CN202311591483 A CN 202311591483A CN 117704837 A CN117704837 A CN 117704837A
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Abstract
The invention relates to a heating furnace dew point value control method, which comprises the following steps: step one: sampling by a dew point sensor, and reading the actual dew point value of the heating furnace; step two: the AD module converts the actual dew point value and outputs a digital quantity signal; step three: inputting the digital quantity signal into a PID controller for operation, and outputting an adjusting signal; step four: the DA module converts the regulating signal and outputs a control signal; step five: according to the control signal, the air proportional valve automatically adjusts the output flow of the dry air; the dew point sensor synchronously reads the actual dew point value of the heating furnace, and the process is performed again from the first step in a circulating way, and the process is repeated. According to the heating furnace dew point value control method, the inflation quantity can be automatically adjusted according to the change of the dew point value, so that the dew point value is in a relatively stable state, dew point fluctuation can be effectively reduced, the control process in the heating furnace is ensured to be more reliable and stable, the scrap of the material sheets is reduced, the production cost is reduced, and the production benefit is improved.
Description
Technical Field
The invention relates to the technical field of heating furnaces, in particular to a heating furnace dew point value control method.
Background
The dew point value of the furnace refers to the temperature at which water vapor in the air in the furnace reaches saturation and begins to condense during combustion or heating. The dew point value depends on the humidity and pressure in the air, and when the temperature drops to or below this value, water vapor condenses into water droplets or dew. In the operation of a furnace, control and regulation of dew point values is critical to maintaining good industrial process and equipment performance.
In production, the task of the oven is to warm the aluminium-silicon coated web from room temperature to about 930 degrees and then rapidly feed the web into the die in the press to achieve rapid prototyping under specific conditions. In this complex process, the dew point value in the furnace becomes a critical parameter. The process requires that the dew point value in the furnace be below-15 degrees celsius, so it must be ensured that the dew point in the heating furnace is below this value. To achieve this, it is necessary to continuously charge the drying-treated compressed air into the heating furnace.
In the control process, the key element of the charging of the heating furnace is an on-off switch valve. When the valve is conducted, the flow reaches 85m 3 /h; when the valve is closed, the flow is reduced to 0m 3 And/h. The on-off control of the process is regulated and controlled based on a preset dew point value. However, as the length of the heating furnace reaches 41 meters, the volume of the heating furnace is relatively large, and certain incongruity exists in the inflation of the switch valve, so that the dew point fluctuation is large, the stable control is difficult to realize, and even an alarm mechanism is possibly triggered, so that the heating furnace is unfavorable for production.
Disclosure of Invention
Based on the method, the invention provides a control method for the dew point value of the heating furnace, which can automatically adjust the inflation amount according to the change of the dew point value, so that the dew point value is in a relatively stable state, the dew point fluctuation can be effectively reduced, the control process in the heating furnace is ensured to be more reliable and stable, the scrap of the material sheets is reduced, the production cost is reduced, and the production benefit is improved.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a heating furnace dew point value control method comprises the following steps:
step one: sampling by a dew point sensor, and reading the actual dew point value of the heating furnace;
step two: the AD module converts the actual dew point value and outputs a digital quantity signal;
step three: inputting the digital quantity signal into a PID controller for operation, and outputting an adjusting signal;
step four: the DA module converts the regulating signal and outputs a control signal;
step five: according to the control signal, the air proportional valve automatically adjusts the output flow of the dry air; at this time, the dew point sensor synchronously reads the actual dew point value of the heating furnace, and the steps are executed again and again, so that the dew point value of the heating furnace can be controlled in real time.
According to the heating furnace dew point value control method, the inflation quantity can be automatically adjusted according to the change of the dew point value, so that the dew point value is in a relatively stable state, dew point fluctuation can be effectively reduced, the control process in the heating furnace is ensured to be more reliable and stable, the scrap of the material sheets is reduced, the production cost is reduced, and the production benefit is improved.
In one embodiment, in the second step, the AD module is connected to the dew point sensor through a connection line, and a voltage signal generated by the dew point sensor is fed back to the AD module, where the AD module converts the received voltage signal into a digital signal through a PLC program, and the digital signal continuously output by the AD module is in a proportional relationship with the variation of the actual dew point value.
In one embodiment, in the fourth step, the DA module converts the received digital adjustment signal into the analog control signal through the PLC program, where the magnitude of the control signal is in a proportional relationship with the magnitude of the adjustment signal.
In one embodiment, the control signal is a voltage signal.
Drawings
FIG. 1 is a schematic diagram of a method for controlling dew point of a heating furnace according to an embodiment of the present invention;
fig. 2 is a flow chart of the method for controlling the dew point value of the heating furnace shown in fig. 1.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1 and 2, a method for controlling a dew point value of a heating furnace according to an embodiment of the invention includes the following steps:
step one: sampling by a dew point sensor, and reading the actual dew point value of the heating furnace;
and the dew point value inside the heating furnace is sampled and read in real time by using a dew point sensor. The dew point value refers to the temperature at which water vapor in the air condenses to liquid water, so that the dew point sensor can measure the temperature at which water vapor in the air reaches saturation and begins to condense.
Step two: the AD module converts the actual dew point value and outputs a digital quantity signal;
the actual dew point value acquired by the dew point sensor is converted into a digital quantity signal by an AD module (analog-digital converter). The digital quantity signal represents the numerical result of the dew point value, and can be further processed and transmitted in numerical value, so that the conversion from an analog signal to a digital signal is realized, and the data is easier to process and transmit.
In the step, the AD module is connected with the dew point sensor through a connecting wire, a voltage signal generated by the dew point sensor is fed back to the AD module, the AD module converts the received voltage signal into a digital quantity signal through a PLC program, wherein the digital quantity signal continuously output by the AD module is in a proportional relation with the change quantity of an actual dew point value, namely the unit change quantity of the actual dew point value and the unit change quantity of the digital quantity signal can be in one-to-one correspondence.
Step three: inputting the digital quantity signal into a PID controller for operation, and outputting an adjusting signal;
the digital quantity signal is input into a PID controller for calculation and processing, and the PID controller generates a corresponding adjusting signal according to the difference between the actual dew point value and the expected value. This adjustment signal can be used in subsequent steps to control the air flow in the furnace, enabling the system to automatically adjust to maintain the desired dew point value.
Wherein the adjustment signal is inversely proportional to the digital quantity signal.
Step four: the DA module converts the regulating signal and outputs a control signal; the conversion from digital signals to analog signals is accomplished via a DA module (digital-to-analog converter), i.e., the digital regulating signals generated by the PID controller are converted to analog control signals for subsequent operation of the air proportional valve.
In this step, the DA module converts the received digital quantity adjusting signal into an analog quantity control signal through a PLC program, where the control signal is a voltage signal, the size of the control signal is in a proportional relationship with the size of the adjusting signal, specifically, the smaller the digital quantity adjusting signal, the smaller the control signal converted from the digital quantity adjusting signal.
Step five: according to the control signal, the air proportional valve automatically adjusts the output flow of the dry air; at this time, the dew point sensor synchronously reads the actual dew point value of the heating furnace, and the steps are executed again and again, so that the dew point value of the heating furnace can be controlled in real time.
By adjusting the air proportional valve, the system can realize automatic control, and ensure the accurate flow of the dry air in the heating furnace, thereby maintaining the expected dew point value and ensuring the stability and quality of the processing process.
In the whole process, the steps act together, the inflation quantity can be automatically adjusted according to the change of the dew point value, so that the dew point value is in a relatively stable state, dew point fluctuation can be effectively reduced, an air control system in the heating furnace can stably maintain the required dew point value, the control process in the heating furnace is ensured to be more reliable and stable, the scrap of the material sheets is reduced, the production cost is reduced, and the production benefit is improved.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (4)
1. The method for controlling the dew point value of the heating furnace is characterized by comprising the following steps:
step one: sampling by a dew point sensor, and reading the actual dew point value of the heating furnace;
step two: the AD module converts the actual dew point value and outputs a digital quantity signal;
step three: inputting the digital quantity signal into a PID controller for operation, and outputting an adjusting signal;
step four: the DA module converts the regulating signal and outputs a control signal;
step five: according to the control signal, the air proportional valve automatically adjusts the output flow of the dry air; at this time, the dew point sensor synchronously reads the actual dew point value of the heating furnace, and the steps are executed again and again, so that the dew point value of the heating furnace can be controlled in real time.
2. The method according to claim 1, wherein in the second step, the AD module is connected to the dew point sensor through a connection line, a voltage signal generated by the dew point sensor is fed back to the AD module, and the AD module converts the received voltage signal into a digital signal through a PLC program, wherein the digital signal continuously output by the AD module is in a proportional relationship with a variation of an actual dew point value.
3. The method according to claim 1, wherein in the fourth step, the DA module converts the received digital quantity adjusting signal into an analog quantity control signal through a PLC program, wherein the magnitude of the control signal is in a proportional relationship with the magnitude of the adjusting signal.
4. A method of controlling a dew point value of a heating furnace according to claim 3, wherein the control signal is a voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311591483.2A CN117704837A (en) | 2023-11-27 | 2023-11-27 | Heating furnace dew point value control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311591483.2A CN117704837A (en) | 2023-11-27 | 2023-11-27 | Heating furnace dew point value control method |
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| Publication Number | Publication Date |
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| CN117704837A true CN117704837A (en) | 2024-03-15 |
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| CN202311591483.2A Pending CN117704837A (en) | 2023-11-27 | 2023-11-27 | Heating furnace dew point value control method |
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- 2023-11-27 CN CN202311591483.2A patent/CN117704837A/en active Pending
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