CN112325328B - Residual oxygen amount control method and device for non-direct-fired annealing furnace - Google Patents

Residual oxygen amount control method and device for non-direct-fired annealing furnace Download PDF

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CN112325328B
CN112325328B CN202011093526.0A CN202011093526A CN112325328B CN 112325328 B CN112325328 B CN 112325328B CN 202011093526 A CN202011093526 A CN 202011093526A CN 112325328 B CN112325328 B CN 112325328B
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fuel ratio
air
residual oxygen
limit value
oxygen amount
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CN112325328A (en
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任伟超
李靖
杨红远
乔梁
李洋龙
律琳琳
张晓峰
侯小坤
陈彪
王振鹏
张启明
康永华
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Shougang Jingtang United Iron and Steel Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/24—Controlling height of burner
    • F23N2237/26—Controlling height of burner oxygen-air ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2239/00—Fuels
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Abstract

The invention discloses a residual oxygen amount control method and a residual oxygen amount control device of a non-direct-fired annealing furnace, wherein the method comprises the following steps: acquiring the gas proportion of gas components, the safe lower limit value of residual oxygen amount and the safe upper limit value of residual oxygen amount; the fuel gas proportion comprises a target control value proportion, a maximum calorific value proportion and a minimum calorific value proportion; obtaining a set air-fuel ratio according to a target control value ratio, obtaining a maximum air-fuel ratio according to a maximum heat value ratio, and obtaining a minimum air-fuel ratio according to a minimum heat value ratio; obtaining a residual oxygen amount lower limit value according to a set air-fuel ratio, a maximum air-fuel ratio and a residual oxygen amount safety lower limit value; obtaining an upper limit value of the residual oxygen amount according to a set air-fuel ratio, a minimum air-fuel ratio and a safety upper limit value of the residual oxygen amount; and setting the residual oxygen amount of the non-direct-fired annealing furnace according to the lower limit value and the upper limit value of the residual oxygen amount. The invention can solve the problem of inaccuracy of the setting value of the residual oxygen amount at present, ensures the residual oxygen amount to be in a safe range, improves the heating efficiency and avoids the phenomena of corrosion and over-combustion of the radiant tube.

Description

Residual oxygen amount control method and device for non-direct-fired annealing furnace
Technical Field
The invention relates to the technical field of cold continuous rolling vertical annealing, in particular to a method and a device for controlling the residual oxygen amount of a non-direct combustion type annealing furnace.
Background
The non-direct-fired annealing furnace in the existing production line is generally not provided with an on-line heat value instrument, and cannot analyze the theoretical air-fuel ratio of coke oven gas in real time. This results in the system being able to set only one fixed parameter when setting the stoichiometric air-fuel ratio. However, the air-fuel ratio of the fuel gas changes with the fluctuation of the composition, and in this case, the influence of the fluctuation of the composition of the fuel gas on the residual oxygen amount needs to be considered. If the theoretical air-fuel ratio set by the system is smaller than the actual theoretical air-fuel ratio of the fuel gas, the residual oxygen amount is lower, and the phenomena of corrosion and over-combustion of the radiant tube occur; too high residual oxygen content causes a problem of low heating efficiency.
Therefore, the more effective and accurate control of the residual oxygen amount of the non-direct-fired annealing furnace is a problem to be solved.
Disclosure of Invention
In view of the above problems, the present invention provides a method and a device for controlling residual oxygen amount in a non-direct-fired annealing furnace, which can accurately obtain a set value of residual oxygen amount and ensure that an actual value of residual oxygen amount is within a safe range.
In a first aspect, the present application provides the following technical solutions through an embodiment:
a residual oxygen amount control method of a non-direct-fired annealing furnace comprises the following steps:
acquiring a fuel gas ratio, a residual oxygen quantity safety lower limit value and a residual oxygen quantity safety upper limit value of fuel gas components; the fuel gas proportion comprises a target control value proportion, a maximum heat value proportion and a minimum heat value proportion; the maximum heat value ratio and the minimum heat value ratio are boundary values corresponding to gas component ratio fluctuation;
obtaining a set air-fuel ratio according to the target control value ratio, obtaining a maximum air-fuel ratio according to the maximum heat value ratio, and obtaining a minimum air-fuel ratio according to the minimum heat value ratio;
obtaining a lower limit value of residual oxygen amount used for setting according to the set air-fuel ratio, the maximum air-fuel ratio and the lower limit value of residual oxygen amount safety;
and obtaining the upper limit value of the residual oxygen amount for setting according to the set air-fuel ratio, the minimum air-fuel ratio and the safety upper limit value of the residual oxygen amount.
Optionally, the obtaining a set air-fuel ratio according to the target control value ratio, obtaining a maximum air-fuel ratio according to the maximum calorific value ratio, and obtaining a minimum air-fuel ratio according to the minimum calorific value ratio includes:
according to
Figure BDA0002722914920000021
Obtaining the set air-fuel ratio, the maximum air-fuel ratio, and the minimum air-fuel ratio; wherein, AFR gas For the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio;
Figure BDA0002722914920000024
the oxygen ratio in the gas mixture ratio corresponding to the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio is set; c. C i The proportion of the component i in the fuel gas ratio corresponding to the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio is set; r is i The theoretical air-fuel ratio of the component i in the gas mixture ratio corresponding to the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio.
Optionally, the obtaining a lower limit value of the residual oxygen amount for setting according to the set air-fuel ratio, the maximum air-fuel ratio and the lower limit value of the residual oxygen amount safety includes:
according to the model
Figure BDA0002722914920000022
Obtaining a lower limit value of residual oxygen amount for setting; wherein E is O2 Alpha is the residual oxygen content coefficient in the maximum heat value proportioning, r is the safe lower limit value of the residual oxygen content 0max For maximum air-fuel ratio, A O2 Is the percentage of oxygen in the air, x 1 Is a lower limit value of residual oxygen amount, r set To set the air-fuel ratio.
Optionally, the obtaining an upper limit value of the residual oxygen amount for setting according to the set air-fuel ratio, the minimum air-fuel ratio, and the upper limit value of the residual oxygen amount safety includes:
according to the model
Figure BDA0002722914920000023
Obtaining an upper limit value of residual oxygen for setting; wherein, E ″ O2 Alpha is the residual oxygen amount safety upper limit value, alpha is the residual oxygen amount coefficient, r 0min For very small air-fuel ratio, A O2 Is the percentage of oxygen in the air, x 2 Is an upper limit value of residual oxygen amount, r set To set the air-fuel ratio.
Optionally, the minimum air-fuel ratio and the maximum air-fuel ratio are within 0.5% to 6%, the range of the safe upper limit value of the residual oxygen amount is 0 to 8, and the range of the safe lower limit value of the residual oxygen amount is 0 to 6%, the range of the lower limit value of the residual oxygen amount and the upper limit value of the residual oxygen amount is 3.4 to 4.6%.
In a second aspect, based on the same inventive concept, the present application provides the following technical solutions through an embodiment:
a residual oxygen amount control device of a non-direct-fired annealing furnace comprises:
the ratio acquisition module is used for acquiring the gas ratio of gas components, the safe lower limit value of residual oxygen amount and the safe upper limit value of residual oxygen amount; the fuel gas proportion comprises a target control value proportion, a maximum heat value proportion and a minimum heat value proportion; the maximum heat value ratio and the minimum heat value ratio are boundary values corresponding to gas component ratio fluctuation;
the air-fuel ratio obtaining module is used for obtaining a set air-fuel ratio according to the target control value ratio, obtaining a maximum air-fuel ratio according to the maximum heat value ratio, and obtaining a minimum air-fuel ratio according to the minimum heat value ratio;
the first residual oxygen quantity obtaining module is used for obtaining a lower limit value of the residual oxygen quantity used for setting according to the set air-fuel ratio, the maximum air-fuel ratio and the lower limit value of the residual oxygen quantity safety;
and the second residual oxygen quantity acquisition module is used for acquiring the upper limit value of the residual oxygen quantity used for setting according to the set air-fuel ratio, the minimum air-fuel ratio and the safety upper limit value of the residual oxygen quantity.
Optionally, the air-fuel ratio obtaining module is specifically configured to:
according to
Figure BDA0002722914920000031
Obtaining the set air-fuel ratio, the maximum air-fuel ratio, and the minimum air-fuel ratio; wherein, AFR gas For the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio;
Figure BDA0002722914920000033
the oxygen ratio in the gas mixture ratio corresponding to the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio is set; c. C i The proportion of the component i in the fuel gas ratio corresponding to the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio is set; r is i The stoichiometric air-fuel ratio of the component i in the fuel gas ratio corresponding to the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio.
Optionally, the first residual oxygen amount obtaining module is specifically configured to:
according to the model
Figure BDA0002722914920000032
Obtaining a lower limit value of residual oxygen for setting; wherein, E' O2 Alpha is the residual oxygen amount safety lower limit value, alpha is the residual oxygen amount coefficient in the maximum heat value proportioning, r 0max For maximum air-fuel ratio, A O2 Is the percentage of oxygen in the air, x 1 Is a lower limit value of residual oxygen amount, r set To set the air-fuel ratio.
Optionally, the second residual oxygen amount obtaining module is specifically configured to:
according to the model
Figure BDA0002722914920000041
Obtaining an upper limit value of residual oxygen for setting; wherein, E' O2 Alpha is the residual oxygen amount safety upper limit value, alpha is the residual oxygen amount coefficient, r 0min In order to achieve an extremely small air-fuel ratio,A O2 is the percentage of oxygen in the air, x 2 Is an upper limit value of residual oxygen amount, r set To set the air-fuel ratio.
Optionally, the minimum air-fuel ratio and the maximum air-fuel ratio are within 0.5% to 6%, the range of the safe upper limit value of the residual oxygen amount is 0 to 8, and the range of the safe lower limit value of the residual oxygen amount is 0 to 6%, the range of the lower limit value of the residual oxygen amount and the upper limit value of the residual oxygen amount is 3.4 to 4.6%.
The invention provides a residual oxygen amount control method and a device of a non-direct-fired annealing furnace, wherein the method comprises the steps of obtaining the gas mixture ratio of gas components, the lower safety limit value of the residual oxygen amount and the upper safety limit value of the residual oxygen amount; the fuel gas proportion comprises a target control value proportion, a maximum heat value proportion and a minimum heat value proportion, and the maximum heat value proportion and the minimum heat value proportion are boundary values corresponding to fuel gas component proportion fluctuation; and then, obtaining a set air-fuel ratio according to the target control value ratio, obtaining a maximum air-fuel ratio according to the maximum heat value ratio, and obtaining a minimum air-fuel ratio according to the minimum heat value ratio so as to influence the fluctuation of the comprehensive air-fuel ratio. Further, obtaining a lower limit value of residual oxygen for setting according to a set air-fuel ratio, a maximum air-fuel ratio and a lower limit value of residual oxygen safety, and obtaining an upper limit value of residual oxygen for setting according to the set air-fuel ratio, the minimum air-fuel ratio and the upper limit value of residual oxygen safety; therefore, the final upper/lower limit value of the residual oxygen amount which can be used for setting is obtained based on the lower/upper limit value of the residual oxygen amount safety, the actual residual oxygen amount can be guaranteed to fluctuate between the lower/upper limit value of the residual oxygen amount safety, and finally, the residual oxygen amount of the non-direct-combustion type annealing furnace can be set according to the lower limit value and the upper limit value of the residual oxygen amount. Therefore, the embodiment of the invention can solve the problem of inaccuracy of the current setting value of the residual oxygen amount, ensure that the actual value of the residual oxygen amount is in a safe range, improve the heating efficiency and avoid the phenomena of corrosion and over-combustion of the radiant tube.
The above description is only an overview of the technical solutions of the present invention, and the present invention can be implemented in accordance with the content of the description so as to make the technical means of the present invention more clearly understood, and the above and other objects, features, and advantages of the present invention will be more clearly understood.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts. In the drawings:
FIG. 1 is a flowchart showing a residual oxygen amount control method of a non-direct-fired annealing furnace according to a first embodiment of the present invention;
FIG. 2 is a schematic view showing the relationship between the air-fuel ratio and the residual oxygen amount in the first embodiment of the invention;
FIG. 3 is a view showing a fluctuation range between a lower limit value of a residual oxygen amount and a lower limit value of a residual oxygen amount safety in the first embodiment of the present invention;
FIG. 4 is a diagram showing a fluctuation range between an upper limit value of a residual oxygen amount and a safety upper limit value of the residual oxygen amount in the first embodiment of the present invention;
FIG. 5 is a schematic view showing the construction of an apparatus for controlling a residual oxygen amount in a non-direct combustion type annealing furnace according to a third embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
First embodiment
Referring to fig. 1, fig. 1 is a flow chart illustrating a method for controlling residual oxygen content in a non-direct-fired annealing furnace according to a first embodiment of the present invention.
The method comprises the following steps:
step S10: acquiring the gas proportion of gas components, the safe lower limit value of residual oxygen amount and the safe upper limit value of residual oxygen amount; the fuel gas proportion comprises a target control value proportion, a maximum heat value proportion and a minimum heat value proportion; the maximum heat value proportion and the minimum heat value proportion are boundary values corresponding to gas component proportion fluctuation.
In step S10, the gas mixture ratio is the ratio of each component constituting the gas component. In production, the target control value proportion is a heat value proportion scheme which is generally required to be set, the maximum heat value proportion is a proportion scheme which can be set and can generate the maximum heat value, and the minimum heat value proportion is a proportion scheme which can be set and can generate the minimum heat value. The maximum heat value proportion and the minimum heat value proportion are boundary values of the heat values of the fuel gas. The coke oven gas thermal parameters of an annealing furnace are shown in table 1 below:
Figure BDA0002722914920000061
in table 1, component 1 is the target control value ratio, component 2 is the maximum calorific value ratio, and component 3 is the minimum calorific value ratio.
The lower limit value and the upper limit value of the residual oxygen quantity safety are limit values for safety production, and within the range of the lower limit value and the upper limit value, higher heating efficiency can be ensured, and the problems of corrosion of a radiant tube or secondary combustion in a pipeline and the like can be avoided. Specifically, in this embodiment, the upper limit of the residual oxygen safety is in the range of 0 to 8%, and the lower limit of the residual oxygen safety is in the range of 0 to 6%.
Step S20: obtaining a set air-fuel ratio according to the target control value ratio, obtaining a maximum air-fuel ratio according to the maximum heat value ratio, and obtaining a minimum air-fuel ratio according to the minimum heat value ratio;
in step S20, the order of acquisition of the set air-fuel ratio, the maximum air-fuel ratio, and the minimum air-fuel ratio is not limited. The set air-fuel ratio indicates an air-fuel ratio actually set in the annealing furnace system, i.e., a system set air-fuel ratio; the maximum air-fuel ratio represents an air-fuel ratio upper limit value when the air-fuel ratio fluctuates due to fluctuation of gas components; minimum air-fuel ratio meterThe lower limit value of the air-fuel ratio is shown when the air-fuel ratio fluctuates due to fluctuations in the gas component. Air-fuel ratio of 1m 3 The amount of air consumed by the combustible gas when it just burns completely.
Further, in this embodiment, according to the formula:
Figure BDA0002722914920000071
to obtain the set air-fuel ratio, the extremely large air-fuel ratio, and the extremely small air-fuel ratio.
When AFR gas In order to set the air-fuel ratio,
Figure BDA0002722914920000072
setting the oxygen ratio in the fuel gas ratio corresponding to the air-fuel ratio; c. C i In order to set the proportion of the component i in the fuel gas ratio corresponding to the air-fuel ratio, the specific component i can be each item component H in the table 1 2 、CH 4 、CO、C 2 H 6 、C 2 H 4 、CO 2 、N 2 And O 2 ；r i The theoretical air-fuel ratio of the component i in the fuel gas ratio corresponding to the set air-fuel ratio.
When AFR gas In the case of an extremely large air-fuel ratio,
Figure BDA0002722914920000073
the oxygen content ratio in the fuel gas ratio corresponding to the maximum air-fuel ratio; c. C i For the ratio of component i in the fuel gas ratio corresponding to the maximum air-fuel ratio, the specific component i can be each item component H in Table 1 2 、CH 4 、CO、C 2 H 6 、C 2 H 4 、CO 2 、N 2 And O 2 ；r i The theoretical air-fuel ratio of the component i in the fuel gas ratio corresponding to the maximum air-fuel ratio.
When AFR gas At the time of an extremely small air-fuel ratio,
Figure BDA0002722914920000074
gas distribution for extremely small air-fuel ratioOxygen in the ratio; c. C i The specific component i can be each item component H in Table 1 2 、CH 4 、CO、C 2 H 6 、C 2 H 4 、CO 2 、N 2 And O 2 ；r i The theoretical air-fuel ratio of the component i in the fuel gas ratio corresponding to the minimum air-fuel ratio.
In the following description, r is used set 、r 0max And r 0min Each represents an AFR gas The air-fuel ratio, the maximum air-fuel ratio, and the minimum air-fuel ratio are set.
Taking the three components of the fuel gas mixture ratio in table 1 above as an example, the set air-fuel ratio, the maximum air-fuel ratio, and the minimum air-fuel ratio can be obtained according to the above equation (1) as follows: 4.08, 4.59, 3.72.
Step S30: and obtaining a lower limit value of the residual oxygen amount for setting according to the set air-fuel ratio, the maximum air-fuel ratio and the lower limit value of the residual oxygen amount safety.
Step S40: and obtaining the upper limit value of the residual oxygen amount for setting according to the set air-fuel ratio, the minimum air-fuel ratio and the safety upper limit value of the residual oxygen amount.
Generally, if the annealing furnace system is set to a theoretical air-fuel ratio smaller than the actual gas-theoretical air-fuel ratio. In this case, the residual oxygen amount is low, and in severe cases, an over-combustion phenomenon occurs, and the relationship between the residual oxygen amount and the actual air-fuel ratio is shown in fig. 2. Under the condition of a certain actual air-fuel ratio, the residual oxygen quantity is gradually reduced along with the increase of the theoretical air-fuel ratio of the coke oven gas.
In step S30 and step S40, the lower limit value and the upper limit value of the residual oxygen amount are set as the residual oxygen amount values set in the annealing furnace system. The lower limit value and the upper limit value of the residual oxygen amount are values obtained in consideration of the change in the air-fuel ratio caused by the fluctuation of the gas component. Even if the air-fuel ratio changes due to fluctuation of fuel gas components, the actual residual oxygen amount can be in a safe range, and excessive high or excessive low residual oxygen amount is avoided. The execution sequence of step S30 and step S40 is not limited.
Specifically, the lower limit value of the residual oxygen amount for setting is obtained according to a model:
Figure BDA0002722914920000081
obtaining a lower limit value of residual oxygen for setting; wherein, E' O2 Alpha is the residual oxygen content coefficient in the maximum heat value proportioning, r is the safe lower limit value of the residual oxygen content 0max For maximum air-fuel ratio, A O2 Is the percentage of oxygen in the air, x 1 Is a lower limit value of residual oxygen amount, r set To set the air-fuel ratio.
In an example given in Table 1, if E' O2 The value of 0.5 percent, the value of alpha is 3.08 0max The value of A is 4.59 O2 A value of 21%, r set The value was 4.075. At this time, the lower limit value x of the residual oxygen amount is obtained 1 ＝3.39％。
As shown in fig. 3, there is shown a fluctuation of the actual residual oxygen amount between the set air-fuel ratio and the maximum air-fuel ratio. That is to say, the lower limit value of the residual oxygen amount actually used for setting is obtained through the model, the safe lower limit value and the maximum air-fuel ratio of the actual residual oxygen amount can be comprehensively considered, when the lower limit value of the residual oxygen amount is used, the actual residual oxygen amount can also fluctuate in a safe range, and the reduction of the residual oxygen amount caused by the increase of the air-fuel ratio in the actual generation process is prevented.
Also, the lower limit value of the residual oxygen amount for setting is obtained according to a model:
Figure BDA0002722914920000091
obtaining an upper limit value of residual oxygen for setting; wherein, E ″) O2 Is the safety upper limit value of residual oxygen, alpha is the coefficient of residual oxygen, r 0min At a very small air-fuel ratio, A O2 Is the percentage of oxygen in the air, x 2 Is an upper limit value of residual oxygen amount, r set To set the air-fuel ratio.
In an example using Table 1 as an example, if E ″) O2 The value of alpha is 3.08, r is 6 percent 0min The value is 3.72A O2 A value of 21%, r set The value was 4.075. At this time, the upper limit value x of the residual oxygen amount is obtained 1 ＝4.67％。
As shown in fig. 4, there is shown a case where the actual residual oxygen amount fluctuates between the set air-fuel ratio and the extremely small air-fuel ratio. That is, the upper limit value of the residual oxygen amount actually used for setting is obtained through the model, the safety upper limit value and the minimum air-fuel ratio of the actual residual oxygen amount can be comprehensively considered, when the upper limit value of the residual oxygen amount is used, the actual residual oxygen amount can also fluctuate in a safety range, and the residual oxygen amount caused by low heat value in the actual generation process is prevented from rising.
Combining the above examples, a preferred data range for the lehr combustion system of the present embodiment can be determined: when the air-fuel ratio is set to 0.5 to 6, the residual oxygen amount is set to 3.4 to 4.6%. The air-fuel ratio and the residual oxygen amount are kept within the above ranges to ensure safe combustion.
Step S50: and setting the residual oxygen amount of the non-direct-combustion type annealing furnace according to the lower residual oxygen amount limit value and the upper residual oxygen amount limit value.
In step S50, the specific value of the residual oxygen amount of the final non-direct-fired annealing furnace may be set between the upper limit value and the lower limit value of the residual oxygen amount according to the requirement, and is not limited. Preferably, the residual oxygen amount is set to be in a range of 3.4% to 4.6%, and an error in the boundary value is avoided.
In summary, the method for controlling residual oxygen content of a non-direct-combustion annealing furnace provided in this embodiment obtains a fuel gas ratio of fuel gas components, a lower residual oxygen content safety limit value, and an upper residual oxygen content safety limit value; the fuel gas proportion comprises a target control value proportion, a maximum heat value proportion and a minimum heat value proportion, and the maximum heat value proportion and the minimum heat value proportion are boundary values corresponding to fuel gas component proportion fluctuation; and then, obtaining a set air-fuel ratio according to the target control value ratio, obtaining a maximum air-fuel ratio according to the maximum heat value ratio, and obtaining a minimum air-fuel ratio according to the minimum heat value ratio so as to influence the fluctuation of the comprehensive air-fuel ratio. Further, obtaining a lower limit value of residual oxygen for setting according to a set air-fuel ratio, a maximum air-fuel ratio and a lower limit value of residual oxygen safety, and obtaining an upper limit value of residual oxygen for setting according to the set air-fuel ratio, the minimum air-fuel ratio and the upper limit value of residual oxygen safety; therefore, the final upper/lower limit value of the residual oxygen amount which can be used for setting is obtained based on the lower/upper limit value of the residual oxygen amount safety, the actual residual oxygen amount can be guaranteed to fluctuate between the lower/upper limit value of the residual oxygen amount safety, and finally, the residual oxygen amount of the non-direct-combustion type annealing furnace is set according to the lower limit value and the upper limit value of the residual oxygen amount. Therefore, the inaccurate problem of present residual oxygen volume's setting value can be solved to this embodiment, guarantees that residual oxygen volume's actual value is in safety range, has improved heating efficiency, has avoided radiant tube corruption and overfire phenomenon.
Second embodiment
Referring to fig. 5, a second embodiment of the present invention provides a residual oxygen control apparatus 300 for a non-direct-fired furnace based on the same inventive concept. FIG. 5 is a schematic view showing the configuration of a residual oxygen amount control apparatus 300 for a non-direct-fired annealing furnace according to a second embodiment of the present invention.
The apparatus 300 for controlling residual oxygen amount of a non-direct-fired annealing furnace includes:
the ratio obtaining module 301 is configured to obtain a gas ratio of gas components, a safe lower limit value of residual oxygen amount, and a safe upper limit value of residual oxygen amount; the fuel gas proportion comprises a target control value proportion, a maximum heat value proportion and a minimum heat value proportion; the maximum heat value ratio and the minimum heat value ratio are boundary values corresponding to gas component ratio fluctuation;
an air-fuel ratio obtaining module 302, configured to obtain a set air-fuel ratio according to the target control value ratio, obtain a maximum air-fuel ratio according to the maximum heat value ratio, and obtain a minimum air-fuel ratio according to the minimum heat value ratio;
a first residual oxygen amount obtaining module 303, configured to obtain a lower limit value of a residual oxygen amount for setting according to the set air-fuel ratio, the maximum air-fuel ratio, and the lower limit value of the residual oxygen amount safety;
and a second residual oxygen amount obtaining module 304, configured to obtain an upper limit value of a residual oxygen amount for setting according to the set air-fuel ratio, the minimum air-fuel ratio, and the upper limit value of the residual oxygen amount safety.
As an optional implementation manner, the air-fuel ratio obtaining module 302 is specifically configured to:
according to
Figure BDA0002722914920000111
Obtaining the set air-fuel ratio, the maximum air-fuel ratio, and the minimum air-fuel ratio; wherein, AFR gas For the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio;
Figure BDA0002722914920000114
the oxygen ratio in the gas mixture ratio corresponding to the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio is set; c. C i The ratio of the component i in the fuel gas ratio corresponding to the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio is set; r is i The theoretical air-fuel ratio of the component i in the gas mixture ratio corresponding to the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio.
As an optional implementation manner, the first residual oxygen amount obtaining module 303 is specifically configured to:
according to the model
Figure BDA0002722914920000112
Obtaining a lower limit value of residual oxygen for setting; wherein, E' O2 Alpha is the residual oxygen content coefficient in the maximum heat value proportioning, r is the safe lower limit value of the residual oxygen content 0max For maximum air-fuel ratio, A O2 Is the percentage of oxygen in the air, x 1 Is a lower limit value of residual oxygen amount, r set To set the air-fuel ratio.
As an optional implementation manner, the second residual oxygen amount obtaining module 304 is specifically configured to:
according to the model
Figure BDA0002722914920000113
Obtaining residual oxygen amount for settingAn upper limit value; wherein, E ″ O2 Alpha is the residual oxygen amount safety upper limit value, alpha is the residual oxygen amount coefficient, r 0min At a very small air-fuel ratio, A O2 Is the percentage of oxygen in the air, x 2 Is an upper limit value of residual oxygen amount, r set To set the air-fuel ratio.
As an optional embodiment, the minimum air-fuel ratio and the maximum air-fuel ratio are within 0.5% to 6%, the range of the safe upper limit value of the residual oxygen amount is 0 to 8, and when the range of the safe lower limit value of the residual oxygen amount is 0 to 6, the range of the lower limit value of the residual oxygen amount and the upper limit value of the residual oxygen amount is 3.4 to 4.6%.
It should be noted that the embodiment of the present invention provides a residual oxygen amount control apparatus 300 for a non-direct-fired annealing furnace, which is embodied and produces the same technical effects as the method embodiments described above, and for the sake of brief description, reference may be made to the corresponding contents in the method embodiments described above without reference to the apparatus embodiments.
The term "and/or" appearing herein is merely one type of associative relationship that describes 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; the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means can be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
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.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
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 controlling residual oxygen amount of a non-direct-fired annealing furnace is characterized by comprising the following steps:
acquiring a fuel gas ratio, a residual oxygen quantity safety lower limit value and a residual oxygen quantity safety upper limit value of fuel gas components; the fuel gas proportion comprises a target control value proportion, a maximum heat value proportion and a minimum heat value proportion; the maximum heat value ratio and the minimum heat value ratio are boundary values corresponding to gas component ratio fluctuation;
obtaining a set air-fuel ratio according to the target control value ratio, obtaining a maximum air-fuel ratio according to the maximum heat value ratio, and obtaining a minimum air-fuel ratio according to the minimum heat value ratio;
obtaining a lower limit value of the residual oxygen amount for setting according to the set air-fuel ratio, the maximum air-fuel ratio and the lower limit value of the residual oxygen amount safety;
obtaining an upper limit value of the residual oxygen amount for setting according to the set air-fuel ratio, the minimum air-fuel ratio and the upper limit value of the residual oxygen amount safety;
the obtaining of the lower limit value of the residual oxygen amount for setting according to the set air-fuel ratio, the maximum air-fuel ratio and the lower limit value of the residual oxygen amount safety comprises the following steps: according to the model
Figure FDA0003793031780000011
Obtaining the lower limit value of the residual oxygen amount for setting; wherein, E' O2 Alpha is the residual oxygen amount safety lower limit value, alpha is the residual oxygen amount coefficient in the maximum heat value proportioning, r 0max For maximum air-fuel ratio, A O2 Is the percentage of oxygen in the air, x 1 Is a lower limit value of residual oxygen amount, r set To set the air-fuel ratio;
the obtaining of the upper limit value of the residual oxygen amount for setting according to the set air-fuel ratio, the minimum air-fuel ratio and the upper limit value of the residual oxygen amount safety includes: according to the model
Figure FDA0003793031780000012
Obtaining the residual oxygen amount upper limit value for setting; wherein, E ″) O2 Alpha is the residual oxygen amount safety upper limit value, alpha is the residual oxygen amount coefficient, r 0min For very small air-fuel ratio, A O2 Is the percentage of oxygen in the air, x 2 Is an upper limit value of residual oxygen amount, r set To set the air-fuel ratio.
2. The method according to claim 1, wherein the obtaining a set air-fuel ratio according to the target control value ratio, obtaining a maximum air-fuel ratio according to the maximum heat value ratio, and obtaining a minimum air-fuel ratio according to the minimum heat value ratio includes:
according to
Figure FDA0003793031780000021
Obtaining the set air-fuel ratio, the maximum air-fuel ratio, and the minimum air-fuel ratio; wherein, AFR gas For the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio;
Figure FDA0003793031780000023
the oxygen ratio in the gas mixture ratio corresponding to the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio is set; c. C i The ratio of the component i in the fuel gas ratio corresponding to the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio is set; r is a radical of hydrogen i The theoretical air-fuel ratio of the component i in the gas mixture ratio corresponding to the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio.
3. The method according to claim 1, wherein the minimum air-fuel ratio and the maximum air-fuel ratio are within 0.5% to 6%, and the range of the safe upper limit value of the residual oxygen amount is 0 to 8, and the range of the safe lower limit value of the residual oxygen amount is 0 to 6, and the range of the lower limit value of the residual oxygen amount and the upper limit value of the residual oxygen amount is 3.4 to 4.6%.
4. A residual oxygen amount control device of a non-direct-fired annealing furnace is characterized by comprising:
the proportion obtaining module is used for obtaining the gas proportion of gas components, a residual oxygen quantity safety lower limit value and a residual oxygen quantity safety upper limit value; the fuel gas proportion comprises a target control value proportion, a maximum calorific value proportion and a minimum calorific value proportion; the maximum heat value proportion and the minimum heat value proportion are boundary values corresponding to gas component proportion fluctuation;
the air-fuel ratio obtaining module is used for obtaining a set air-fuel ratio according to the target control value ratio, obtaining a maximum air-fuel ratio according to the maximum heat value ratio, and obtaining a minimum air-fuel ratio according to the minimum heat value ratio;
the first residual oxygen amount acquisition module is used for acquiring a lower limit value of the residual oxygen amount for setting according to the set air-fuel ratio, the maximum air-fuel ratio and the lower limit value of the residual oxygen amount safety;
the second residual oxygen quantity obtaining module is used for obtaining an upper limit value of the residual oxygen quantity used for setting according to the set air-fuel ratio, the minimum air-fuel ratio and the upper limit value of the residual oxygen quantity safety;
the first residual oxygen amount obtaining module is specifically configured to: according to the model
Figure FDA0003793031780000022
*r set Obtaining the lower limit value of the residual oxygen amount for setting; wherein, E' O2 Alpha is the residual oxygen content coefficient in the maximum heat value proportioning, r is the safe lower limit value of the residual oxygen content 0max For maximum air-fuel ratio, A O2 Is the percentage of oxygen in the air, x 1 Is a lower limit value of residual oxygen amount, r set To set the air-fuel ratio;
the second residual oxygen amount obtaining module is specifically configured to: root of herbaceous plantAccording to the model
Figure FDA0003793031780000031
*r set Obtaining the upper limit value of the residual oxygen amount for setting; wherein, E ″) O2 Alpha is the residual oxygen amount safety upper limit value, alpha is the residual oxygen amount coefficient, r 0min For very small air-fuel ratio, A O2 Is the percentage of oxygen in the air, x 2 Is an upper limit value of residual oxygen amount, r set To set the air-fuel ratio.
5. The apparatus of claim 4, wherein the air-fuel ratio acquisition module is specifically configured to:
according to
Figure FDA0003793031780000032
Obtaining the set air-fuel ratio, the maximum air-fuel ratio, and the minimum air-fuel ratio; wherein, AFR gas For the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio;
Figure FDA0003793031780000033
the oxygen ratio in the gas mixture ratio corresponding to the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio is set; c. C i The ratio of the component i in the fuel gas ratio corresponding to the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio is set; r is i The theoretical air-fuel ratio of the component i in the gas mixture ratio corresponding to the set air-fuel ratio/the maximum air-fuel ratio/the minimum air-fuel ratio.
6. The apparatus according to claim 4, wherein the minimum air-fuel ratio and the maximum air-fuel ratio are within 0.5% to 6%, and when the upper limit value of the residual oxygen safety is in a range of 0 to 8 and the lower limit value of the residual oxygen safety is in a range of 0 to 6, the lower limit value of the residual oxygen and the upper limit value of the residual oxygen are in a range of 3.4 to 4.6%.
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