Method and system for controlling CO concentration in annealing furnace, medium and control equipment

Abstract

The invention discloses a method and a system for controlling CO concentration in an annealing furnace, a medium and control equipment. The method comprises the following steps: constructing a first valve opening model between the ignition number of burners and the opening of a gas flow regulating valve in advance; in the first valve opening model, fitting the opening value of the gas flow regulating valve according to the total rated gas flow of the current furnace section, the burner ignition quantity proportion and a first flow control coefficient, and increasing the initial opening value to control the initial opening of the gas flow regulating valve; and in the annealing furnace, referring to the first valve opening degree model, controlling the actual opening degree of the gas flow regulating valve to be correspondingly regulated according to the change of the actual ignition number of the burners so as to ensure that the CO concentration in the annealing furnace is always within the CO concentration standard exceeding reference value.

Description

Technical Field

[0001] The present invention relates to the technical field of steel production and processing, and in particular to a method, system, medium and control equipment for controlling CO concentration in an annealing furnace. Background Art

[0002] The burner in the annealing furnace is a key component of the annealing equipment. During the annealing process, the temperature in the furnace of the annealing furnace needs to be maintained within a certain range to ensure that the workpiece can achieve the expected annealing effect. The burner can effectively control the temperature in the furnace through the automatic ignition function and the adjustment of the type of gas (such as coal gas and air) and flow rate sent into the furnace.

[0003] Generally speaking, in the gas flow control of the annealing furnace, the opening of the gas valve is kept fixed, for example, always keeping the maximum opening. Therefore, in the stage of low burner load, especially in the initial stage of furnace ignition, it is easy to cause excessive gas, resulting in excessive CO concentration of the flue gas in the furnace of the annealing furnace (more than 100ppm), which is not in compliance with regulations from the perspective of environmental protection and safety. Summary of the invention

[0004] In order to solve or partially solve the technical problem of incomplete combustion caused by gas fluctuation in the prior art, resulting in excessive CO concentration, the present invention provides a method, system, medium and control equipment for controlling the CO concentration in an annealing furnace, by constructing a first valve opening model between the number of burner ignitions and the opening of the gas flow regulating valve, thereby achieving precise control of the opening of the gas flow regulating valve, ensuring that each burner can burn fully when ignited and the gas is not excessive, thereby avoiding excessive CO concentration of the flue gas in the furnace of the annealing furnace, ensuring safe production and compliance with environmental requirements.

[0005] In order to solve the above technical problems, the first aspect of the present invention discloses a method for controlling the CO concentration in an annealing furnace, the method comprising:

[0006] A first valve opening model between the number of burner ignitions and the opening of the gas flow control valve is constructed in advance; in the first valve opening model, the opening value of the gas flow control valve is fitted according to the total rated gas flow of the current furnace section, the proportion of the number of burner ignitions and the first flow control coefficient, and the initial opening value is increased to control the initial opening of the gas flow control valve;

[0007] In the annealing furnace, referring to the first valve opening model, the actual opening of the gas flow regulating valve is controlled to be adjusted accordingly according to the change in the actual ignition quantity of the burner to ensure that the CO concentration in the annealing furnace is always within the CO concentration exceeding the reference value.

[0008] Optionally, the first valve opening model is specifically:

[0009]

[0010] Among them, MV is the opening value of the gas flow regulating valve, k1 is the first flow control coefficient, Q is the total rated gas flow of the current furnace section, N′ is the number of burners ignited in the current furnace section, N is the total number of burners in the current furnace section, and MV0 is the initial opening value.

[0011] Optionally, after constructing the first valve opening model between the burner ignition quantity and the gas flow regulating valve opening in advance, the method further includes:

[0012] The CO concentration in the flue gas is used as a compensation adjustment amount to adjust the first valve opening model to obtain a second valve opening model.

[0013] Optionally, the step of adjusting the first valve opening model by taking the CO concentration in the flue gas as a compensation adjustment amount to obtain a second valve opening model specifically includes:

[0014] The CO concentration in the flue gas, the CO concentration exceeding reference value, and the second flow control coefficient are fitted to the first valve opening model to obtain the second valve opening model.

[0015] Optionally, in the annealing furnace, the method further comprises:

[0016] With reference to the second valve opening model, the actual opening of the gas flow regulating valve is controlled to be adjusted accordingly according to the changes in the actual ignition quantity of the burner and the changes in the CO concentration value in the flue gas, so as to ensure that the CO concentration in the annealing furnace is always within the CO concentration exceeding the reference value.

[0017] Optionally, the second valve opening model is specifically:

[0018]

[0019] Among them, MV is the opening value of the gas flow regulating valve, k1 is the first flow control coefficient, Q is the total rated gas flow of the current furnace section, N′ is the number of burners ignited in the current furnace section, N is the total number of burners in the current furnace section, MV0 is the initial opening value, C′ is the reference value of CO concentration exceeding the standard, k2 is the second flow control coefficient, and C is the CO concentration in the flue gas.

[0020] Optionally, before the annealing furnace, the method further comprises:

[0021] Adjust the valve zero point of the gas flow regulating valve.

[0022] A second aspect of the present invention discloses a system for controlling CO concentration in an annealing furnace, comprising:

[0023] A construction module is used to construct in advance a first valve opening model between the number of burner ignitions and the opening of the gas flow control valve; in the first valve opening model, the opening value of the gas flow control valve is fitted according to the total rated gas flow of the current furnace section, the proportion of the number of burner ignitions and the first flow control coefficient, and the initial opening value is increased to control the initial opening of the gas flow control valve;

[0024] The control module is used to control the actual opening of the gas flow regulating valve in the annealing furnace, with reference to the first valve opening model, to make corresponding adjustments according to the change in the actual ignition quantity of the burner, so as to ensure that the CO concentration in the annealing furnace is always within the CO concentration exceeding the reference value.

[0025] According to a third aspect of the present invention, a computer-readable storage medium is disclosed, on which a computer program is stored, and when the program is executed by a processor, the steps of the above method are implemented.

[0026] According to a fourth aspect of the present invention, a control device is disclosed, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the program.

[0027] Through one or more technical solutions of the present invention, the present invention has the following beneficial effects or advantages:

[0028] The present invention provides a method, system, medium and control equipment for controlling the CO concentration in an annealing furnace. By constructing a first valve opening model between the number of burner ignitions and the opening of a gas flow regulating valve, accurate control of the opening of the gas flow regulating valve is achieved, ensuring that each burner can burn fully when ignited and that the gas is not excessive, thereby avoiding excessive CO concentration in the flue gas in the furnace of the annealing furnace, ensuring safe production and compliance with environmental requirements.

[0029] In addition, the first valve opening model is dynamically compensated in combination with the actual concentration of CO in the flue gas, which can further achieve accurate control of the opening of the gas flow regulating valve.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0032] Figure 1 A burner arrangement diagram of an annealing furnace according to an embodiment of the present invention is shown;

[0033] Figure 2 A flow chart of a method for controlling CO concentration in an annealing furnace according to an embodiment of the present invention is shown;

[0034] Figure 3 A schematic diagram of a system for controlling CO concentration in an annealing furnace according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0036] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0037] In a first aspect, an embodiment of the present invention provides a method for controlling CO concentration in an annealing furnace. The method is applied in the annealing furnace, mainly in the start-up stage of the annealing furnace, and of course is also applicable to other control stages of the annealing furnace.

[0038] like Figure 1 The figure shows the burner arrangement of the annealing furnace. The main gas and main air are introduced into the burner in the furnace of the annealing furnace through their own pipelines and vent pipes for mixing and ignition, thereby controlling the temperature of the annealing furnace. A gas flow regulating valve is provided on the main gas pipeline. The burner in the furnace of the annealing furnace is an automatic ignition burner. A CO laser analyzer is provided inside the flue of the annealing furnace to measure the CO concentration in the flue.

[0039] like Figure 2 FIG. 1 is a flow chart of a method for controlling CO concentration in an annealing furnace provided by an embodiment of the present invention, which at least includes the following steps:

[0040] S201, constructing in advance a first valve opening model between the burner ignition quantity and the gas flow control valve opening.

[0041] Specifically, a first valve opening model between the burner ignition quantity and the gas flow control valve opening is established according to the valve pipeline and the flow characteristics of the burner system. In the first valve opening model, the opening value of the gas flow control valve is fitted according to the total rated gas flow of the current furnace section, the burner ignition quantity ratio and the first flow control coefficient, and the initial opening value is added to control the initial opening of the gas flow control valve.

[0042] In order to further illustrate the correlation relationship between the internal parameters of the first valve opening model, the following uses formula (1) for explanation.

[0043]

[0044] Wherein, MV is the opening value of the gas flow regulating valve, MV0 is the initial opening value, the total opening value of the gas flow regulating valve is 100, and the value range of the initial opening value MV0 is 1 to 15, but it does not form a restriction. The purpose of designing the initial opening value is to provide a small amount of gas to ensure that the burner is successfully ignited and does not cause excessive CO in the flue gas. In practical applications, 10 can be selected according to the empirical value, but it does not form a restriction.

[0045] Q is the total rated gas flow of the current furnace section, which is a fixed value.

[0046] N' is the number of burners ignited in the current furnace section, and N is the total number of burners in the current furnace section. The number of burners ignited in the current furnace section N' is a variable value, and the opening value MV of the gas flow control valve gradually increases the opening according to the increase of the number of burners ignited in the previous furnace section N', and adaptively decreases the opening according to the decrease of the number of burners ignited in the previous furnace section N', thereby controlling the gas flow to be adaptively supplied according to the number of burners burning, preventing excessive gas supply from causing excessive CO concentration in the flue gas.

[0047] k1 is the first flow control coefficient, which is used to control the CO concentration in the flue gas not to exceed the standard when the number of burners ignited is 0-N one by one, for example, not to exceed the CO concentration exceeding the standard reference value: 100ppm, of course, it can also be other values. Among them, the first flow control coefficient k1 is related to the flow characteristics of the valve pipeline and the burner system itself, and the value range is: 0.06-0.2. Within this range, the first flow control coefficient k1 is adaptively valued with reference to the change of the number of burners ignited N' in the front furnace section.

[0048] Among them, the first valve opening model can be constructed in advance and can be directly called during the furnace startup stage.

[0049] S202, in the annealing furnace, referring to the first valve opening model, controlling the actual opening of the gas flow regulating valve to make corresponding adjustments according to the change in the actual ignition quantity of the burner, so as to ensure that the CO concentration in the annealing furnace is always within the CO concentration exceeding the reference value.

[0050] In order to avoid the zero point drift of the valve, before implementing S202, the gas flow control valve is tested for opening and closing functions to perform zero point calibration, and the valve zero point of the gas flow control valve is adjusted to ensure the accuracy of valve opening control.

[0051] Further, the control stage of the annealing furnace is at least divided into: a furnace start-up stage and a high load stage. In the furnace start-up stage, the burner is gradually ignited and opened according to demand. In the high load stage, the burner opening ratio exceeds 80%. The first valve opening model of this embodiment is mainly used in the furnace start-up stage of the annealing furnace, and the gas flow rate is adaptively controlled after the burner is ignited. Of course, it can also be used for gas flow control in any control stage of the annealing furnace.

[0052] Specifically, the opening value MV of the gas flow control valve gradually increases the opening according to the increase in the number of burners ignited N' in the fore furnace section, and adaptively decreases the opening according to the decrease in the number of burners ignited N' in the fore furnace section, thereby controlling the gas flow to be adaptively supplied according to the number of burners burning, preventing excessive gas supply from causing excessive CO concentration in the flue gas, and ensuring that the CO concentration in the annealing furnace is always within the reference value of CO concentration exceeding the standard. For example, if the reference value of CO concentration exceeding the standard is 100ppm, the CO in the flue gas is always controlled to be within 100ppm according to the first valve opening model.

[0053] In an optional implementation, since the control of the gas flow rate is also affected by the CO concentration in the flue gas in the furnace, after the first valve opening model is constructed, the CO concentration in the flue gas is used as a compensation adjustment amount to adjust the first valve opening model to obtain a second valve opening model.

[0054] Specifically, the CO concentration in the flue gas, the CO concentration exceeding reference value, and the second flow control coefficient are fitted into the first valve opening model to obtain the second valve opening model. The second valve opening model is shown in formula (2).

[0055]

[0056] Among them, MV is the opening value of the gas flow regulating valve, k1 is the first flow control coefficient, Q is the total rated gas flow of the current furnace section, N′ is the number of burners ignited in the current furnace section, N is the total number of burners in the current furnace section, MV0 is the initial opening value, and the definitions of the above parameters refer to the above description and will not be repeated here. In addition, C′ is the reference value of CO concentration exceeding the standard, ranging from 0-10000ppm, with preferred values ​​of 50ppm, 100ppm, etc., but it does not constitute a limitation. C is the CO concentration in the flue gas, measured by a CO laser analyzer. k2 is the second flow control coefficient, which is used to control the CO concentration in the flue gas not to exceed the standard during the process of the number of burners ignited from 0-N one by one, for example, not exceeding the reference value of CO concentration exceeding the standard: 100ppm, of course, it can also be further limited to 50ppm. The value range of the second flow control coefficient k2 is 1-5.

[0057] Furthermore, after obtaining the second valve opening model, the actual opening of the gas flow regulating valve is controlled with reference to the second valve opening model to make corresponding adjustments according to changes in the actual ignition quantity of the burner and changes in the CO concentration value in the flue gas, so as to ensure that the CO concentration in the annealing furnace is always within the CO concentration exceeding the reference value.

[0058] Specifically, a CO laser analyzer is used to measure the CO concentration in the flue gas, and the CO concentration value in the flue gas is substituted into the second valve opening model together with the actual number of burners ignited to obtain the actual opening of the corresponding gas flow regulating valve. The actual opening of the gas flow regulating valve is adjusted accordingly according to the changes in the actual number of burners ignited and the changes in the CO concentration value in the flue gas.

[0059] More specifically, when ensuring that the CO concentration in the annealing furnace is always within the CO concentration exceeding standard reference value, the reference standard of CO concentration exceeding standard can be further strengthened to control the CO concentration in the annealing furnace within the sub-reference value within the CO concentration exceeding standard reference value, for example, within 50 ppm.

[0060] As the valve has zero point drift during production and operation, and there may be carbon deposits inside the burner, the flow characteristics of the system change. Therefore, zero point calibration is required after each shutdown and maintenance, and the value range of the first flow control coefficient k1 and the second flow control coefficient k2 is adjusted in actual testing to ensure that the CO concentration in the annealing furnace is always within the CO concentration excess reference value.

[0061] By implementing the above technical solution, it can be ensured that the CO concentration of the flue gas of the annealing furnace burner, especially the pulse burner, does not exceed the standard during the spot combustion process.

[0062] In the second aspect, based on the same inventive concept as the method for controlling the CO concentration in an annealing furnace provided in the embodiment of the first aspect, the embodiment of the present invention further provides a system for controlling the CO concentration in an annealing furnace, see Figure 3 ,include:

[0063] A construction module 301 is used to construct in advance a first valve opening model between the number of burner ignitions and the opening of the gas flow control valve; in the first valve opening model, the opening value of the gas flow control valve is fitted according to the total rated gas flow of the current furnace section, the proportion of the number of burner ignitions and the first flow control coefficient, and the initial opening value is increased to control the initial opening of the gas flow control valve;

[0064] The control module 302 is used to control the actual opening of the gas flow regulating valve in the annealing furnace, with reference to the first valve opening model, and make corresponding adjustments according to the change in the actual ignition quantity of the burner to ensure that the CO concentration in the annealing furnace is always within the CO concentration exceeding the reference value.

[0065] It should be noted that the system for controlling the CO concentration in the annealing furnace provided in the embodiment of the present invention, wherein the specific manner in which each module performs operations has been described in detail in the method embodiment provided in the first aspect above, and the specific implementation process can refer to the method embodiment provided in the first aspect above, and will not be elaborated here.

[0066] In the third aspect, based on the same inventive concept as the method for controlling the CO concentration in the annealing furnace provided in the embodiment of the first aspect mentioned above, the embodiment of the present invention further discloses a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described above.

[0067] In the fourth aspect, based on the same inventive concept as the method for controlling the CO concentration in an annealing furnace provided in the embodiment of the first aspect mentioned above, an embodiment of the present invention further discloses a control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any of the methods described above when executing the program.

[0068] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0069] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these 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 these modifications and variations.

Claims

1. A method for controlling CO concentration in an annealing furnace, characterized in that: The method comprises: A first valve opening model between the number of burner ignitions and the opening of the gas flow control valve is constructed in advance; in the first valve opening model, the opening value of the gas flow control valve is fitted according to the total rated gas flow of the current furnace section, the proportion of the number of burner ignitions and the first flow control coefficient, and the initial opening value is increased to control the initial opening of the gas flow control valve; In the annealing furnace, referring to the first valve opening model, the actual opening of the gas flow regulating valve is controlled to be adjusted accordingly according to the change in the actual ignition quantity of the burner to ensure that the CO concentration in the annealing furnace is always within the CO concentration exceeding the reference value.

2. The method according to claim 1, characterized in that The first valve opening model is specifically: Wherein, MV is the opening value of the gas flow regulating valve, k1 is the first flow control coefficient, Q is the total rated gas flow of the current furnace section, N ′ is the number of burners ignited in the current furnace section, N is the total number of burners in the current furnace section, and MV0 is the initial opening value.

3. The method according to claim 1 or 2, characterized in that After constructing the first valve opening model between the burner ignition quantity and the gas flow regulating valve opening in advance, the method further includes: The CO concentration in the flue gas is used as a compensation adjustment amount to adjust the first valve opening model to obtain a second valve opening model.

4. The method according to claim 3, characterized in that The method of using the CO concentration in the flue gas as a compensation adjustment amount to adjust the first valve opening model to obtain a second valve opening model specifically includes: The CO concentration in the flue gas, the CO concentration exceeding reference value, and the second flow control coefficient are fitted to the first valve opening model to obtain the second valve opening model.

5. The method according to claim 3, characterized in that In the annealing furnace, the method further comprises: With reference to the second valve opening model, the actual opening of the gas flow regulating valve is controlled to be adjusted accordingly according to the changes in the actual ignition quantity of the burner and the changes in the CO concentration value in the flue gas, so as to ensure that the CO concentration in the annealing furnace is always within the CO concentration exceeding the reference value.

6. The method according to claim 4, characterized in that The second valve opening model is specifically: Wherein, MV is the opening value of the gas flow regulating valve, k1 is the first flow control coefficient, Q is the total rated gas flow of the current furnace section, N ′ is the number of burners ignited in the current furnace section, N is the total number of burners in the current furnace section, MV0 is the initial opening value, C ′ is the CO concentration exceeding the standard reference value, k2 is the second flow control coefficient, and C is the CO concentration in the flue gas.

7. The method according to claim 1, characterized in that Prior to the annealing furnace, the method further comprises: Adjust the valve zero point of the gas flow regulating valve.

8. A system for controlling CO concentration in an annealing furnace, characterized in that: include: A construction module is used to construct in advance a first valve opening model between the number of burner ignitions and the opening of the gas flow control valve; in the first valve opening model, the opening value of the gas flow control valve is fitted according to the total rated gas flow of the current furnace section, the proportion of the number of burner ignitions and the first flow control coefficient, and the initial opening value is increased to control the initial opening of the gas flow control valve; The control module is used to control the actual opening of the gas flow regulating valve in the annealing furnace, with reference to the first valve opening model, to make corresponding adjustments according to the change in the actual ignition quantity of the burner, so as to ensure that the CO concentration in the annealing furnace is always within the CO concentration exceeding the reference value.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method according to any one of claims 1 to 7 are implemented.

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