A power self-tuning system of a boiler combustion system

Abstract

The present application relates to the technical field of boiler combustion heating or power generation, and the present application comprises: a power self-setting system of a boiler combustion system, wherein η0 is set as the sum of boiler disturbance variables, Pset is set as the system set power, P is set as the boiler instantaneous power and is a dynamic value calculated by a processor, which satisfies the following relationship: P=Pset*η0, a plurality of single disturbance variables ηX affecting the boiler operation power are set, wherein η0 is equal to the product of the plurality of disturbance variables; the present application has the advantages that: the intelligence of the boiler ACC automatic control system is improved, the normal, stable and safe work of the boiler combustion system can be realized under unattended condition, and the abnormality of the boiler system caused by the sudden condition of the system during the work of the boiler is avoided, for example: the risk of burning and fire of the filter bag caused by the excessively high exhaust gas temperature, the off-standard exhaust emission of the flue gas caused by the excessively high oxygen content of the flue gas and a series of problems.

Description

Technical Field

[0001] This invention relates to the technical field of boiler combustion for heating or power generation, and more particularly to a power self-tuning system for a boiler combustion system. Background Technology

[0002] Throughout the boiler combustion process, there are many unstable factors that may lead to serious consequences if not controlled. Under normal circumstances, the domestic practice is to manually observe the status of each location and then manually adjust the power. This approach is not very reliable; there are too many parameters to manage manually, and at the same time, incorrect judgments are often made when the user is not in a good mental state.

[0003] Using this boiler power self-tuning method, allowing the system to replace manual power adjustment, offers extremely high reliability, timely response, and a low risk of errors. It avoids issues such as substandard exhaust emissions, violations of national exhaust emission regulations, excessively high flue gas temperatures leading to coking and slagging problems, flue gas temperatures exceeding the maximum heating temperature of the bag filter, thus preventing fire risks, and excessively high steam temperatures exceeding the turbine's steam quality requirements, which also affects the reliability of steam pipe flange seals. Summary of the Invention

[0004] The purpose of this invention is to provide a power self-tuning system for a boiler combustion system designed to solve at least one technical problem in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following solution: a power self-tuning system for a boiler combustion system, comprising a processor for detecting the boiler status, a boiler operating status detection device electrically connected to the processor and feeding back the detected boiler status analog quantity information to the processor, characterized in that: η0 is set as the total variable of boiler disturbance variables, Pset is the system set power, P is set as the instantaneous power of the boiler and is a dynamic value calculated by the processor, which satisfies the following relationship: P=Pset*η0, and multiple sets of individual disturbance variables ηX affecting the boiler operating power are set, where η0 is equal to the product of multiple sets of disturbance variables.

[0006] Among them, the multiple sets of individual interference variables ηX affecting boiler operating power include η1, which is an interference variable indicating that the flue gas oxygen concentration is not up to standard.

[0007] Or the interference variable of unqualified furnace negative pressure is η2

[0008] Or the boiler outlet flue gas temperature is too high, and the disturbance variable is η3.

[0009] Or, the excessively high flue gas temperature at the economizer outlet is a disturbance variable of η4.

[0010] Or, the disturbance variable η5 is that the flue gas temperature after the air preheater is too high.

[0011] Or the disturbance variable η6 is that the flue gas temperature at the inlet of the induced draft fan is too high.

[0012] Or the interference variable is η7 due to excessively high steam temperature after the superheater.

[0013] Or the steam flow exceeds the rated output interference variable η8; or a combination of one or more of the above.

[0014] Among them, η0=η1*η2*η3*η4*η5*η6*η7*η8.

[0015] Among them, the lower limit value of the disturbance variable ηX during the boiler operation process is Xmin, the upper limit value is Xmax, and the linear disturbance range is YL-YH, which satisfies the following relationship: ηX=(X-Xmin) / (Xmax-Xmin)*(YH-YL)+YL.

[0016] The maximum value of the interference variable ηX is 1 and not equal to 0.

[0017] The display device for setting and displaying operating parameters is electrically connected to the processor, and the human-computer interaction device for setting up control or input parameters is electrically connected to the processor.

[0018] Among them, the interference variable ηX is related to the set value and the actual value of the human-computer interaction device. If the actual value is less than the set value, then ηX is 1.

[0019] If the actual value of the interference variable ηX is greater than the set value, a positive deviation will occur. The larger the positive deviation, the smaller the interference variable, and the two are inversely proportional.

[0020] The advantages of this invention are: it improves the intelligence of the boiler's ACC automatic control system, enabling the boiler combustion system to operate normally, stably, and safely without human intervention. It avoids boiler system malfunctions caused by unforeseen circumstances during operation, such as excessively high flue gas temperature posing a risk of filter bag combustion or excessively high oxygen content in the flue gas leading to substandard emissions. Attached Figure Description

[0021] Figure 1 A diagram showing the parameters of the display device. Figure 1 ;

[0022] Figure 2 A diagram showing the parameters of the display device. Figure 2 ;

[0023] Figure 3 A diagram showing the parameters of the display device. Figure 3 . Detailed Implementation

[0024] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so as to intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0025] In the description of this invention, if directional descriptions are involved, such as "up," "down," "front," "back," "left," "right," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, it is only for the convenience of describing the invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. When a feature is referred to as "set," "fixed," or "connected" to another feature, it can be directly set, fixed, or connected to the other feature, or it can be indirectly set, fixed, or connected to the other feature.

[0026] In the description of this invention, the term "several" means one or more; "multiple" means two or more; "greater than," "less than," or "exceeding" are all understood to exclude the stated number; and "above," "below," or "within" are all understood to include the stated number. The terms "first" and "second" are understood to distinguish technical features and not to indicate or imply relative importance, the quantity of indicated technical features, or the order of the indicated technical features.

[0027] Furthermore, unless otherwise defined, the technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for the purpose of describing particular embodiments only and not for limiting the invention. It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof.

[0028] Example: Figure 1-3As shown, a power self-tuning system for a boiler combustion system includes a processor for detecting the boiler status, a boiler operating status detection device electrically connected to the processor and feeding back the detected boiler status analog information to the processor, setting η0 as the sum of boiler disturbance variables, Pset as the system set power, and setting P as the instantaneous power of the boiler as a dynamic value calculated by the processor, which satisfies the following relationship: P = Pset * η0. Multiple sets of individual disturbance variables ηX affecting the boiler operating power are set, where η0 is equal to the product of multiple sets of disturbance variables.

[0029] Among them, the multiple sets of individual interference variables ηX affecting boiler operating power include η1, which is an interference variable indicating that the flue gas oxygen concentration is not up to standard.

[0030] Or the interference variable of unqualified furnace negative pressure is η2

[0031] Or the boiler outlet flue gas temperature is too high, and the disturbance variable is η3.

[0032] Or, the excessively high flue gas temperature at the economizer outlet is a disturbance variable of η4.

[0033] Or, the disturbance variable η5 is that the flue gas temperature after the air preheater is too high.

[0034] Or the disturbance variable η6 is that the flue gas temperature at the inlet of the induced draft fan is too high.

[0035] Or the interference variable is η7 due to excessively high steam temperature after the superheater.

[0036] Or the steam flow exceeds the rated output interference variable η8; or a combination of one or more of the above.

[0037] Among them, η0=η1*η2*η3*η4*η5*η6*η7*η8.

[0038] Among them, the lower limit value of the disturbance variable ηX during the boiler operation process is Xmin, the upper limit value is Xmax, and the linear disturbance range is YL-YH, which satisfies the following relationship: ηX=(X-Xmin) / (Xmax-Xmin)*(YH-YL)+YL.

[0039] The maximum value of the interference variable ηX is 1 and not equal to 0.

[0040] The display device for setting and displaying operating parameters is electrically connected to the processor, and the human-computer interaction device for setting up control or input parameters is electrically connected to the processor.

[0041] Among them, the interference variable ηX is related to the set value and the actual value of the human-computer interaction device. If the actual value is less than the set value, then ηX is 1.

[0042] If the actual value of the interference variable ηX is greater than the set value, a positive deviation will occur. The larger the positive deviation, the smaller the interference variable, and the two are inversely proportional.

[0043] Optionally, the processor is a Siemens PLC, and the algorithm can be a PID closed-loop algorithm.

[0044]

[0045] The calculation of the interference variable is ηX = (X - Xmin) / (Xmax - Xmin) * (YH - YL) + YL

[0046] For example:

[0047] Assuming the current oxygen content is 4.0,

[0048] Then η1 = (4.0 - 3.0) / (4.5 - 3.0) * (1 - 0.5) + 0.5 = 0.8333

[0049] Assuming the current furnace negative pressure is 35,

[0050] η2=(35-20) / (40-20)*(1-0.5)+0.5=0.875

[0051] Other disturbance variables can be calculated based on the examples above. Furthermore, the overall disturbance variable η0 and the current system control power P = Pset * η0 can be calculated. For example, if the power is set to 100% and the disturbance variable η0 = 0.85, then the current instantaneous power P = 100% * 0.85 = 85%.

[0052] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A power self-tuning system for a boiler combustion system, comprising a processor for detecting the boiler status, a boiler operating status detection device electrically connected to the processor and feeding back the detected analog boiler status information to the processor, characterized in that: Let η0 be the sum of boiler disturbance variables, Pset be the system set power, and P be the instantaneous boiler power, a dynamic value calculated by the processor, satisfying the following relationship: P = Pset * η0. Multiple sets of individual disturbance variables ηX affecting boiler operating power are set, where η0 equals the product of these disturbance variables. The disturbance variable ηX has a lower limit value of Xmin and an upper limit value of Xmax during boiler operation. The linear disturbance range YL-YH is 0.5-1, and it satisfies the following relationship: etaX=(X-Xmin) / (Xmax-Xmin)*(YH-YL)+YL, The maximum value of the interference variable ηX is 1 and not equal to 0. The interference variable ηX is related to the set value and the actual value of the human-computer interaction device. If the actual value is less than the lower limit value, then ηX is 1. If the actual value of the interference variable ηX is greater than the lower limit value, then a positive deviation occurs. The larger the positive deviation, the smaller the interference variable. The two are inversely proportional.

2. The power self-tuning system for a boiler combustion system as described in claim 1, characterized in that: The multiple sets of individual interference variables ηX affecting boiler operating power include η1, which is an interference variable indicating that the flue gas oxygen concentration is not up to standard. Or the interference variable of unqualified furnace negative pressure is η2 Or the boiler outlet flue gas temperature is too high, and the disturbance variable is η3. Or, the excessively high flue gas temperature at the economizer outlet is a disturbance variable of η4. Or, the disturbance variable η5 is that the flue gas temperature after the air preheater is too high. Or the disturbance variable η6 is that the flue gas temperature at the inlet of the induced draft fan is too high. Or the interference variable is η7 due to excessively high steam temperature after the superheater. Or the steam flow exceeds the rated output interference variable η8; or a combination of one or more of the above.

3. The power self-tuning system for a boiler combustion system according to claim 2, characterized in that: Among them, η0=η1*η2*η3*η4*η5*η6*η7*η8.

4. The power self-tuning system for a boiler combustion system according to claim 1, characterized in that: The display device for displaying operating parameters is electrically connected to the processor, and the human-computer interaction device for controlling or inputting parameters is electrically connected to the processor.

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