CN109055700B - Method and device for self-optimizing air-fuel ratio of annealing furnace - Google Patents
Method and device for self-optimizing air-fuel ratio of annealing furnace Download PDFInfo
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Abstract
The invention provides a method and a device for self-optimizing the air-fuel ratio of an annealing furnace, which are used for obtaining the initial air-fuel ratio and the step length; obtaining a difference value between the actual furnace temperature and the set furnace temperature; judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature; when the difference value between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, sending first optimizing information; obtaining a gas change value in the furnace through a gas flow variable actuator according to the first optimizing information; and judging the gas variation value in the furnace, and finishing optimization when the gas variation value in the furnace is less than a set value for three times continuously. Solves the technical problems of heat loss, unstable system combustion and the like in the prior art due to poor air-fuel ratio control in the annealing furnace combustion control. The air-fuel ratio can be kept under the working condition of thermal load change, so that the combustion condition is optimized, the optimal combustion control is achieved, the product quality is ensured, the heating quality is improved, the gas consumption is reduced, and the technical effect of obvious economic benefit is achieved.
Description
Technical Field
The invention relates to the technical field of annealing furnace temperature control, in particular to a method and a device for self-optimizing an air-fuel ratio of an annealing furnace.
Background
The annealing furnace temperature control system is actually a single-cross amplitude limiting control system with air-fuel ratio correction, and takes an annealing furnace temperature control loop as a main loop, and the mixed gas flow and the combustion air flow are connected in parallel to be taken as an auxiliary loop. The combustion control system is one of the premises and the keys of the annealing furnace temperature control system, the basic task of the combustion control system is to make the heat provided by the combustion adapt to the requirements of the production line load, and simultaneously to ensure economic combustion and safe operation, wherein the air-fuel ratio is an important factor for ensuring the combustion effect in the furnace, the air-fuel ratio is different in size, the combustion state can be greatly changed, for example, if the air-fuel ratio is too large, redundant air except for the air required by the combustion is heated and then discharged into the atmosphere, the heat is taken away, the heat loss is increased, and from the pollution point of view, the increase of nitrogen and phosphorus oxides discharged into the atmosphere can be caused, and the environment is extremely unfavorable. On the other hand, if the air-fuel ratio is too small and the amount of air combusted is insufficient, incomplete combustion will occur, heat loss will occur, and black smoke will be emitted, which will cause environmental pollution.
However, in the process of implementing the technical solution in the embodiment of the present application, the applicant of the present invention finds that the above prior art has at least the following technical problems:
in the prior art, due to poor air-fuel ratio control in the combustion control of the annealing furnace, the technical problems of heat loss, unstable system combustion and the like exist.
Disclosure of Invention
The embodiment of the invention provides a method and a device for self-optimizing an air-fuel ratio of an annealing furnace, which solve the technical problems of heat loss, unstable system combustion and the like caused by poor air-fuel ratio control in the combustion control of the annealing furnace in the prior art.
In view of the above problems, embodiments of the present application are proposed to provide a method and apparatus for annealing furnace air-fuel ratio self-optimization.
In a first aspect, the present invention provides a method for self-optimizing an air-fuel ratio of an annealing furnace, the method comprising: obtaining an initial air-fuel ratio and a step length; obtaining a difference value between the actual furnace temperature and the set furnace temperature under the condition of maintaining the initial air-fuel ratio; judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature; when the difference value between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, sending first optimizing information, wherein the first optimizing information is an instruction for continuously executing self-optimizing operation; obtaining a gas change value in the furnace through a gas flow variable actuator according to the first optimizing information; and judging the gas variation value in the furnace, and finishing optimization when the gas variation value in the furnace is less than a set value for three times continuously.
Preferably, the determining whether to continue optimizing according to the difference between the actual furnace temperature and the set furnace temperature further includes: when the difference value between the actual furnace temperature and the set furnace temperature is greater than 20 ℃, sending second optimizing information, wherein the second optimizing information is an instruction for stopping executing self-optimizing operation; and stopping the optimizing operation according to the second optimizing information, and failing to optimize.
Preferably, the method further comprises: when the variation of the gas in the furnace is smaller than a set value for three times, copying the initial air-fuel ratio and the step length; sending the initial air-fuel ratio and the step length to a PID controller; and the PID controller continues optimizing according to the initial air-fuel ratio and the step length.
Preferably, the method further comprises: when the variation of the gas in the furnace is larger than the set value, obtaining a first air-fuel ratio according to the step length and the initial air-fuel ratio; and optimizing again according to the first air-fuel ratio.
Preferably, the step size is set to 0-1.
In a second aspect, the present invention provides an apparatus for self-optimizing an air-fuel ratio of an annealing furnace, the apparatus comprising:
a first obtaining unit configured to obtain an initial air-fuel ratio and a step length;
a second obtaining unit, configured to obtain a difference between an actual furnace temperature and a set furnace temperature while maintaining the initial air-fuel ratio;
the first judgment unit is used for judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature;
the first sending unit is used for sending first optimizing information when the difference value between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, and the first optimizing information is an instruction for continuously executing self-optimizing operation;
a third obtaining unit, configured to obtain a gas variation value in the furnace through a gas flow actuator according to the first optimization information;
and the second judgment unit is used for judging the gas variation value in the furnace, and when the gas variation value in the furnace is less than a set value for three times continuously, optimizing is completed.
Preferably, the apparatus further comprises:
a second sending unit, configured to send second optimization information when a difference between the actual furnace temperature and a set furnace temperature is greater than 20 ℃, where the second optimization information is an instruction to stop performing a self-optimization operation;
and the first execution unit is used for stopping the optimization operation according to the second optimization information and failing in optimization.
Preferably, the apparatus further comprises:
the first copying unit is used for copying the initial air-fuel ratio and the step length when the variation of the gas in the furnace is smaller than a set value for three times;
a third sending unit, configured to send the initial air-fuel ratio and the step size to a PID controller;
and the second execution unit is used for continuously optimizing according to the initial air-fuel ratio and the step length by the PID controller.
Preferably, the apparatus further comprises:
a fourth obtaining unit, configured to obtain a first air-fuel ratio according to the step length and the initial air-fuel ratio when the variation of the gas in the furnace is greater than the set value;
a third execution unit for performing the optimization again according to the first air-fuel ratio.
Preferably, the step size is set to 0-1.
In a third aspect, the present invention provides an apparatus for self-optimizing the air-fuel ratio of an annealing furnace, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to realize the following steps: obtaining an initial air-fuel ratio and a step length; obtaining a difference value between the actual furnace temperature and the set furnace temperature under the condition of maintaining the initial air-fuel ratio; judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature; when the difference value between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, sending first optimizing information, wherein the first optimizing information is an instruction for continuously executing self-optimizing operation; obtaining a gas change value in the furnace through a gas flow variable actuator according to the first optimizing information; and judging the gas variation value in the furnace, and finishing optimization when the gas variation value in the furnace is less than a set value for three times continuously.
In a fourth aspect, the present invention provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of: obtaining an initial air-fuel ratio and a step length; obtaining a difference value between the actual furnace temperature and the set furnace temperature under the condition of maintaining the initial air-fuel ratio; judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature; when the difference value between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, sending first optimizing information, wherein the first optimizing information is an instruction for continuously executing self-optimizing operation; obtaining a gas change value in the furnace through a gas flow variable actuator according to the first optimizing information; and judging the gas variation value in the furnace, and finishing optimization when the gas variation value in the furnace is less than a set value for three times continuously.
One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:
according to the method and the device for self-optimizing the air-fuel ratio of the annealing furnace, provided by the embodiment of the invention, the air and the fuel gas are combusted under the condition of maintaining the initial air-fuel ratio by obtaining the initial air-fuel ratio and the step length according to the input air quantity and the fuel gas quantity of the initial air-fuel ratio, the actual furnace temperature of the annealing furnace is detected and compared with the set furnace temperature, and the difference value between the actual furnace temperature and the set furnace temperature is obtained; judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature; when the difference value between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, the current air-fuel ratio meets the requirement, the combustion in the furnace is stable, and first optimizing information is sent, wherein the first optimizing information is an instruction for continuously executing self-optimizing operation; and after the first optimization information is obtained, indicating that the optimization is continued, obtaining a gas change value in the furnace through a gas flow variable actuator, selecting the gas change value in the furnace for three consecutive times, judging the fluctuation condition of the gas change value in the furnace, and when the gas change values in the furnace for three consecutive times are all smaller than a set value, indicating that the self-optimization reaches an expected target, the temperature fluctuation in the furnace is small, the gas consumption is small, the combustion condition can be effectively optimized, and therefore the optimization is successfully finished. The optimal air-fuel ratio is found through self-optimization, so that the ratio of air to fuel gas in the furnace is proper, the combustion requirement of the annealing furnace is met, the heat loss and fuel gas waste caused by excessive air or excessive fuel gas due to improper air-fuel ratio are avoided, and the technical problems of heat loss, unstable system combustion and the like due to poor air-fuel ratio control in the combustion control of the annealing furnace in the prior art are solved. The method has the advantages that the optimal air-fuel ratio is sought under the working condition of thermal load change, so that the combustion condition is optimized, the method is stable and reliable, the optimal combustion control requirement is met, the product quality is ensured, the heating quality is improved, the gas consumption is reduced, and the technical effect of obvious economic benefit is achieved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a schematic flow chart of a method for self-optimizing the air-fuel ratio of an annealing furnace according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an apparatus for self-optimizing an air-fuel ratio of an annealing furnace according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another apparatus for self-optimizing the air-fuel ratio of an annealing furnace according to an embodiment of the present invention.
Description of reference numerals: a first obtaining unit 11, a second obtaining unit 12, a first judging unit 13, a first transmitting unit 14, a third obtaining unit 15, a second judging unit 16, a bus 300, a receiver 301, a processor 302, a transmitter 303, a memory 304, and a bus interface 306.
Detailed Description
The embodiment of the invention provides a method and a device for self-optimizing an air-fuel ratio of an annealing furnace, which are used for solving the technical problems of heat loss, unstable system combustion and the like due to poor air-fuel ratio control in the combustion control of the annealing furnace in the prior art.
The technical scheme provided by the invention has the following general idea:
obtaining an initial air-fuel ratio and a step length; obtaining a difference value between the actual furnace temperature and the set furnace temperature under the condition of maintaining the initial air-fuel ratio; judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature; when the difference value between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, sending first optimizing information, wherein the first optimizing information is an instruction for continuously executing self-optimizing operation; obtaining a gas change value in the furnace through a gas flow variable actuator according to the first optimizing information; and judging the gas variation value in the furnace, and finishing optimization when the gas variation value in the furnace is less than a set value for three times continuously. The air-fuel ratio can be kept under the working condition of thermal load change, so that the combustion condition is optimized, the air-fuel ratio is stable and reliable, the optimal combustion control requirement is met, the product quality is ensured, the heating quality is improved, the gas consumption is reduced, and the technical effect of obvious economic benefit is achieved.
The technical solutions of the present invention are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present invention are described in detail in the technical solutions of the present application, and are not limited to the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Example one
FIG. 1 is a schematic flow chart of a method for self-optimizing the air-fuel ratio of an annealing furnace according to an embodiment of the present invention. As shown in FIG. 1, the embodiment of the invention provides a method for self-optimizing the air-fuel ratio of an annealing furnace, which comprises the following steps:
step 110: obtaining an initial air-fuel ratio and a step length;
further, the step size is set to 0-1.
Specifically, the main task of the annealing furnace combustion control system is to adapt the heat provided by the combustion in the annealing furnace to the requirement of the production line load, and simultaneously ensure that the gas in the furnace can be burnt out, economic combustion and safe operation are realized, and an optimal air-fuel ratio is found, firstly, an initial air-fuel ratio and a step length are set in a PID controller of the annealing furnace combustion control system, the initial air-fuel ratio is a corresponding air-fuel ratio obtained according to a practical theory, the step length is a coefficient for adjusting the air-fuel ratio, it is understood that the PID controller (proportional integral derivative) is called a probability integral difference, which is a mathematical physical term, the automatic adjustment of the parameters of the PID controller is realized by intelligent adjustment or self-correction and self-adaptive algorithm, a pressure controller, a temperature controller, a flow controller and a liquid level controller which are controlled by the PID controller, and a Programmable Logic Controller (PLC) capable of realizing the control function of the PID controller, and a PC system capable of realizing the control of the PID controller, and the like, wherein the parameter setting of the PID controller is the core content of the design of the control system. In the embodiment of the present invention, the step size is a noun in the program language, and is to add a certain number (i.e. step size) to a value in each operation to repeatedly execute the operation. In the embodiment of the invention, the step length is a period step length, namely a combustion optimization process of the primary annealing furnace, the step length is selected to be a value between 0 and 1, and the air-fuel ratio is gradually adjusted through the step length, so that the technical effect of optimizing the air-fuel ratio is realized.
Step 120: obtaining a difference value between the actual furnace temperature and the set furnace temperature under the condition of maintaining the initial air-fuel ratio;
specifically, the annealing furnace combustion control system gives an air input amount and a gas input amount according to the initial air-fuel ratio, and burns gas, so as to control the furnace temperature, measures the actual furnace temperature of the annealing furnace under the condition that the air and the gas of the initial air-fuel ratio are given, compares the detected actual furnace temperature of the annealing furnace with a set furnace temperature value, and the set furnace temperature value is a thermal power converted according to the set initial air-fuel ratio and is a furnace temperature value obtained according to the thermal power. And comparing the obtained actual furnace temperature with the set furnace temperature to obtain a difference value between the actual furnace temperature and the set furnace temperature, wherein for example, the set furnace temperature is 800 ℃, the actually measured furnace temperature is 790 ℃, and the furnace temperature difference value is 10 ℃.
Step 130: judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature;
specifically, the furnace temperature difference obtained in the above step is used for specific judgment, and when the difference between the actual furnace temperature and the set furnace temperature is small, that is, the furnace temperature is in stable fluctuation, it is indicated that the combustion effect of the current air-fuel ratio is good, and the furnace temperature combustion temperature is high, so that the optimization can be continued; when the difference value between the actual furnace temperature and the set furnace temperature is larger, the combustion effect of the current air-fuel ratio is poor, the furnace temperature fluctuation is larger, the optimization is stopped to continue, the air-fuel ratio is adjusted, and the stable combustion in the annealing furnace is ensured.
Step 140: when the difference value between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, sending first optimizing information, wherein the first optimizing information is an instruction for continuously executing self-optimizing operation;
further, the determining whether to continue optimizing according to the difference between the actual furnace temperature and the set furnace temperature further includes: when the difference value between the actual furnace temperature and the set furnace temperature is greater than 20 ℃, sending second optimizing information, wherein the second optimizing information is an instruction for stopping executing self-optimizing operation; and stopping the optimizing operation according to the second optimizing information, and failing to optimize.
Specifically, whether optimization is continued or not is further judged according to the furnace temperature difference, specifically, the two conditions are divided into two, namely, when the difference between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, the furnace temperature of the annealing furnace is proved to be stable and fluctuate, the air-fuel ratio meets the requirement, and optimization can be continued; in addition, when the difference value between the actual furnace temperature and the set furnace temperature is larger than 20, the current furnace temperature fluctuation is large, the air-fuel ratio is not qualified, adjustment is needed, the optimization operation is stopped, and optimization fails. And the air-fuel ratio is adjusted again, a new round of optimization is started, the temperature combustion in the annealing furnace is ensured, the instantaneous fluctuation of air or fuel quantity is prevented, the optimal combustion state is realized, and the combustion can be in the optimal combustion state no matter in the temperature rising process or the temperature lowering process in the annealing furnace.
Step 150: obtaining a gas change value in the furnace through a gas flow variable actuator according to the first optimizing information;
specifically, when the difference value between the actual furnace temperature and the set furnace temperature meets the requirement, first optimization information is sent, the first optimization information represents the optimization continuation, the gas quantity in the furnace is measured after the optimization continuation is determined, the gas change value of each time node in the furnace is measured through a gas flow quantity changer, the time node is a preset time period, the gas change value of each time node is detected, and whether the temperature of the gas change value in the furnace is high or not is judged.
Step 160: and judging the gas variation value in the furnace, and finishing optimization when the gas variation value in the furnace is less than a set value for three times continuously.
Further, the method further comprises: when the variation of the gas in the furnace is smaller than a set value for three times, copying the initial air-fuel ratio and the step length; sending the initial air-fuel ratio and the step length to a PID controller; and the PID controller continues optimizing according to the initial air-fuel ratio and the step length.
Further, the method further comprises: when the variation of the gas in the furnace is larger than the set value, obtaining a first air-fuel ratio according to the step length and the initial air-fuel ratio; and optimizing again according to the first air-fuel ratio.
Specifically, the gas flow rate change amount of each time node is detected by the gas flow rate change actuator, and the gas flow rate change amounts of three consecutive time nodes are compared with a set value, which is a given amount of the gas converted by the thermal power output converted by the PID controller according to the initial air-fuel ratio set by the PID controller, so that the accuracy is improved. When the variation of the selected continuous tertiary gas is smaller than the set value, the air-fuel ratio in the furnace meets the furnace temperature control requirement, the optimal air-fuel ratio is found by taking the minimum gas consumption as an index so as to successfully complete optimization for effectively optimizing the combustion condition, the current air-fuel ratio is further proved to meet the requirement, the currently set initial air-fuel ratio is copied and sent to the PID controller, and the next furnace optimization is continuously carried out by taking the current air-fuel ratio and the step length as the initial input value of the PID controller. When the variation of the fuel gas at any selected time node is larger than the set value, the current combustion effect is poor, the fuel quantity is instantaneously fluctuated, the air-fuel ratio needs to be reset, a new air-fuel ratio, namely the first air-fuel ratio, is obtained through calculation by adding the current initial air-fuel ratio to the step length, the first air-fuel ratio is used as the initial air-fuel ratio again for carrying out self-optimization, the step length can be fixed and unchanged, or can be changed, the step length is controlled by a step length controller, the value of the step length is between 0 and 1, and the air-fuel ratio is continuously optimized through the step length until the air-fuel ratio meeting the requirements is found, so that the optimization is successful. The embodiment of the invention is suitable for an annealing furnace which adopts a double-crossing amplitude limiting combustion control mode and a vertical annealing furnace, and the method is an improvement on a cascade ratio combustion control mode. The air-fuel ratio can be kept under the working condition of thermal load change, so that the combustion condition is optimized, the air-fuel ratio is stable and reliable, the optimal combustion control requirement is met, the product quality is ensured, the heating quality is improved, the gas consumption is reduced, and the technical effect of obvious economic benefit is achieved.
Example two
Based on the same inventive concept as the method for self-optimizing the air-fuel ratio of the annealing furnace in the previous embodiment, the invention also provides a device for self-optimizing the air-fuel ratio of the annealing furnace, which comprises the following components as shown in FIG. 2:
a first obtaining unit 11, wherein the first obtaining unit 11 is used for obtaining an initial air-fuel ratio and a step length;
a second obtaining unit 12, where the second obtaining unit 12 is configured to obtain a difference between an actual furnace temperature and a set furnace temperature while maintaining the initial air-fuel ratio;
the first judging unit 13 is used for judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature;
a first sending unit 14, where the first sending unit 14 is configured to send first optimization information when the difference between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, and the first optimization information is an instruction to continue to perform a self-optimization operation;
a third obtaining unit 15, wherein the third obtaining unit 15 is configured to obtain a gas variation value in the furnace through a gas flow actuator according to the first optimization information;
and the second judging unit 16 is used for judging the gas variation value in the furnace, and when the gas variation value in the furnace is smaller than a set value for three times continuously, optimizing is completed.
Further, the apparatus further comprises:
a second sending unit, configured to send second optimization information when a difference between the actual furnace temperature and a set furnace temperature is greater than 20 ℃, where the second optimization information is an instruction to stop performing a self-optimization operation;
and the first execution unit is used for stopping the optimization operation according to the second optimization information and failing in optimization.
Further, the apparatus further comprises:
the first copying unit is used for copying the initial air-fuel ratio and the step length when the variation of the gas in the furnace is smaller than a set value for three times;
a third sending unit, configured to send the initial air-fuel ratio and the step size to a PID controller;
and the second execution unit is used for continuously optimizing according to the initial air-fuel ratio and the step length by the PID controller.
Further, the apparatus further comprises:
a fourth obtaining unit, configured to obtain a first air-fuel ratio according to the step length and the initial air-fuel ratio when the variation of the gas in the furnace is greater than the set value;
a third execution unit for performing the optimization again according to the first air-fuel ratio.
Further, the step size is set to 0-1.
Various changes and specific examples of the method for self-optimizing the air-fuel ratio of the annealing furnace in the first embodiment of fig. 1 are also applicable to the apparatus for self-optimizing the air-fuel ratio of the annealing furnace in the present embodiment, and the method for implementing the apparatus for self-optimizing the air-fuel ratio of the annealing furnace in the present embodiment is clear to those skilled in the art from the foregoing detailed description of the method for self-optimizing the air-fuel ratio of the annealing furnace, so for the sake of brevity of description, detailed description is not repeated here.
EXAMPLE III
Based on the same inventive concept as the method for self-optimizing the air-fuel ratio of the annealing furnace in the previous embodiment, the invention also provides a device for self-optimizing the air-fuel ratio of the annealing furnace, wherein a computer program is stored on the device, and the computer program is executed by a processor to realize the steps of any method of the network authority authentication method.
Where in fig. 3 a bus architecture (represented by bus 300), bus 300 may include any number of interconnected buses and bridges, bus 300 linking together various circuits including one or more processors, represented by processor 302, and memory, represented by memory 304. The bus 300 may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface 306 provides an interface between the bus 300 and the receiver 301 and transmitter 303. The receiver 301 and the transmitter 303 may be the same element, i.e., a transceiver, providing a means for communicating with various other apparatus over a transmission medium.
The processor 302 is responsible for managing the bus 300 and general processing, and the memory 304 may be used for storing data used by the processor 302 in performing operations.
Example four
Based on the same inventive concept as the data processing method in the foregoing embodiments, the present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of:
obtaining an initial air-fuel ratio and a step length; obtaining a difference value between the actual furnace temperature and the set furnace temperature under the condition of maintaining the initial air-fuel ratio; judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature; when the difference value between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, sending first optimizing information, wherein the first optimizing information is an instruction for continuously executing self-optimizing operation; obtaining a gas change value in the furnace through a gas flow variable actuator according to the first optimizing information; and judging the gas variation value in the furnace, and finishing optimization when the gas variation value in the furnace is less than a set value for three times continuously.
In a specific implementation, when the program is executed by a processor, any method step in the first embodiment may be further implemented.
One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:
according to the method and the device for self-optimizing the air-fuel ratio of the annealing furnace, provided by the embodiment of the invention, the air and the fuel gas are combusted under the condition of maintaining the initial air-fuel ratio by obtaining the initial air-fuel ratio and the step length according to the input air quantity and the fuel gas quantity of the initial air-fuel ratio, the actual furnace temperature of the annealing furnace is detected and compared with the set furnace temperature, and the difference value between the actual furnace temperature and the set furnace temperature is obtained; judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature; when the difference value between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, the current air-fuel ratio meets the requirement, the combustion in the furnace is stable, and first optimizing information is sent, wherein the first optimizing information is an instruction for continuously executing self-optimizing operation; and after the first optimization information is obtained, indicating that the optimization is continued, obtaining a gas change value in the furnace through a gas flow variable actuator, selecting the gas change value in the furnace for three consecutive times, judging the fluctuation condition of the gas change value in the furnace, and when the gas change values in the furnace for three consecutive times are all smaller than a set value, indicating that the self-optimization reaches an expected target, the temperature fluctuation in the furnace is small, the gas consumption is small, the combustion condition can be effectively optimized, and therefore the optimization is successfully finished. The optimal air-fuel ratio is found through self-optimization, so that the ratio of air to fuel gas in the furnace is proper, the combustion requirement of the annealing furnace is met, the heat loss and fuel gas waste caused by excessive air or excessive fuel gas due to improper air-fuel ratio are avoided, and the technical problems of heat loss, unstable system combustion and the like due to poor air-fuel ratio control in the combustion control of the annealing furnace in the prior art are solved. The method has the advantages that the optimal air-fuel ratio is sought under the working condition of thermal load change, so that the combustion condition is optimized, the method is stable and reliable, the optimal combustion control requirement is met, the product quality is ensured, the heating quality is improved, the gas consumption is reduced, and the technical effect of obvious economic benefit is achieved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A method for self-optimizing an air-fuel ratio of an annealing furnace, the method comprising:
obtaining an initial air-fuel ratio and a step length;
obtaining a difference value between the actual furnace temperature and the set furnace temperature under the condition of maintaining the initial air-fuel ratio;
judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature;
when the difference value between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, sending first optimizing information, wherein the first optimizing information is an instruction for continuously executing self-optimizing operation;
obtaining a gas change value in the furnace through a gas flow variable actuator according to the first optimizing information;
judging the variation value of the gas in the furnace, and finishing optimization when the variation value of the gas in the furnace is less than a set value for three times;
the judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature further comprises: when the difference value between the actual furnace temperature and the set furnace temperature is greater than 20 ℃, sending second optimizing information, wherein the second optimizing information is an instruction for stopping executing self-optimizing operation; stopping the optimizing operation according to the second optimizing information, and failing to optimize;
the method further comprises the following steps: when the variation of the gas in the furnace is smaller than a set value for three times, copying the initial air-fuel ratio and the step length; sending the initial air-fuel ratio and the step length to a PID controller; and the PID controller continues optimizing according to the initial air-fuel ratio and the step length.
2. The method of claim 1, wherein the method further comprises:
when the variation of the gas in the furnace is larger than the set value, obtaining a first air-fuel ratio according to the step length and the initial air-fuel ratio;
and optimizing again according to the first air-fuel ratio.
3. The method of claim 1, wherein the step size is set to 0-1.
4. An apparatus for self-optimizing an air-fuel ratio of an annealing furnace, comprising:
a first obtaining unit configured to obtain an initial air-fuel ratio and a step length;
a second obtaining unit, configured to obtain a difference between an actual furnace temperature and a set furnace temperature while maintaining the initial air-fuel ratio;
the first judgment unit is used for judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature;
the first sending unit is used for sending first optimizing information when the difference value between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, and the first optimizing information is an instruction for continuously executing self-optimizing operation;
a third obtaining unit, configured to obtain a gas variation value in the furnace through a gas flow actuator according to the first optimization information;
the second judgment unit is used for judging the gas variation value in the furnace, and when the gas variation value in the furnace is smaller than a set value for three times continuously, optimizing is completed;
a second sending unit, configured to send second optimization information when a difference between the actual furnace temperature and a set furnace temperature is greater than 20 ℃, where the second optimization information is an instruction to stop performing a self-optimization operation;
the first execution unit is used for stopping the optimization operation according to the second optimization information and failing in optimization;
the first copying unit is used for copying the initial air-fuel ratio and the step length when the variation of the gas in the furnace is smaller than a set value for three times;
a third sending unit, configured to send the initial air-fuel ratio and the step size to a PID controller;
and the second execution unit is used for continuously optimizing according to the initial air-fuel ratio and the step length by the PID controller.
5. An apparatus for self-optimizing the air-fuel ratio of an annealing furnace, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to perform the steps of:
obtaining an initial air-fuel ratio and a step length;
obtaining a difference value between the actual furnace temperature and the set furnace temperature under the condition of maintaining the initial air-fuel ratio;
judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature;
when the difference value between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, sending first optimizing information, wherein the first optimizing information is an instruction for continuously executing self-optimizing operation;
obtaining a gas change value in the furnace through a gas flow variable actuator according to the first optimizing information;
judging the variation value of the gas in the furnace, and finishing optimization when the variation value of the gas in the furnace is less than a set value for three times;
the judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature further comprises: when the difference value between the actual furnace temperature and the set furnace temperature is greater than 20 ℃, sending second optimizing information, wherein the second optimizing information is an instruction for stopping executing self-optimizing operation; stopping the optimizing operation according to the second optimizing information, and failing to optimize;
when the variation of the gas in the furnace is smaller than a set value for three times, copying the initial air-fuel ratio and the step length; sending the initial air-fuel ratio and the step length to a PID controller; and the PID controller continues optimizing according to the initial air-fuel ratio and the step length.
6. A computer-readable storage medium, on which a computer program is stored, which program, when executed by a processor, carries out the steps of:
obtaining an initial air-fuel ratio and a step length;
obtaining a difference value between the actual furnace temperature and the set furnace temperature under the condition of maintaining the initial air-fuel ratio;
judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature;
when the difference value between the actual furnace temperature and the set furnace temperature is less than or equal to 20 ℃, sending first optimizing information, wherein the first optimizing information is an instruction for continuously executing self-optimizing operation;
obtaining a gas change value in the furnace through a gas flow variable actuator according to the first optimizing information;
judging the variation value of the gas in the furnace, and finishing optimization when the variation value of the gas in the furnace is less than a set value for three times;
the judging whether to continue optimizing according to the difference value between the actual furnace temperature and the set furnace temperature further comprises: when the difference value between the actual furnace temperature and the set furnace temperature is greater than 20 ℃, sending second optimizing information, wherein the second optimizing information is an instruction for stopping executing self-optimizing operation; stopping the optimizing operation according to the second optimizing information, and failing to optimize;
when the variation of the gas in the furnace is smaller than a set value for three times, copying the initial air-fuel ratio and the step length; sending the initial air-fuel ratio and the step length to a PID controller; and the PID controller continues optimizing according to the initial air-fuel ratio and the step length.
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