A control method and device for boiler hot air damper, and an air supply system control method

Abstract

The present invention provides a control method and device for a boiler hot air damper, and an air supply system control method. The control method for the boiler hot air damper includes: obtaining operating information of a power boiler, including fuel information and hot air pressure; obtaining a first opening value based on the fuel information; determining a corresponding control strategy based on the hot air pressure; obtaining a second opening value based on the control strategy, operating information, and the first opening value; determining a target instruction including a target opening value based on the control strategy and opening value information including the second opening value; and controlling the operation of the hot air damper according to the target instruction. The first opening value is obtained by obtaining the fuel information to match the fuel combustion demand; the control strategy is then determined based on the hot air pressure, and the second opening value is obtained based on the above information, taking into account both fuel demand and safety demand; the target instruction is obtained based on the control strategy and the second opening value to control the operation of the hot air damper, thereby automatically adjusting the hot air damper and improving the safety and economy of boiler combustion.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler combustion control, and in particular to a control method and device for a boiler hot air damper, and an air supply system control method. Background Art

[0002] Power boilers are widely used in industries such as metallurgy and petrochemicals. During boiler combustion, the matching of fuel and combustion air is crucial. Supply air volume and hot air pressure are two crucial combustion air parameters. Traditional boiler combustion control primarily regulates three physical quantities: fuel quantity, supply air volume, and induced draft volume. Automatic regulation of hot air pressure has yet to be implemented. In traditional control methods, the air volume and pressure output by the air supply system are generally negatively correlated. In other words, increasing the hot air damper opening decreases air pressure and increases air volume; decreasing the hot air damper opening increases air pressure and decreases air volume. This results in poor hot air damper control characteristics. Therefore, traditional boiler combustion control methods generally prioritize supply air volume control, while air pressure serves primarily as a protective variable. Adjustment of the hot air damper is only enforced when air pressure exceeds a preset limit, rendering automatic hot air damper control impossible. However, supply air volume and hot air pressure are not only operational indicators but also safety indicators. Only when both are automatically controlled can automatic air supply control be complete and safe. The existing hot air damper control method cannot achieve automatic control, resulting in poor safety and economy during boiler combustion operation. Summary of the Invention

[0003] The problem solved by the present invention is how to realize automatic control of a hot air damper of a power boiler.

[0004] To solve the above problems, the present invention provides a method for controlling a hot air damper of a boiler, comprising:

[0005] Acquiring operating information of the power boiler, the operating information including fuel information and hot air pressure;

[0006] obtaining a first opening value of the hot air damper according to the fuel information;

[0007] Determining a corresponding control strategy according to the hot air pressure, wherein the control strategy includes an override mode, an increment mode, and a locking mode;

[0008] obtaining a second opening value of the hot air damper based on the control strategy, the operating information, and the first opening value;

[0009] determining a target instruction for the hot air damper based on the control strategy and the opening value information, wherein the opening value information includes the second opening value, and the target instruction includes the target opening value of the hot air damper;

[0010] According to the target instruction, the operation of the hot air damper is controlled, which includes controlling the opening of the hot air damper to be equal to the target opening value.

[0011] Optionally, determining a corresponding control strategy according to the hot air pressure includes:

[0012] Determining a magnitude relationship between the hot air pressure and a preset pressure sequence, the pressure sequence including at least four incrementally distributed pressure values, namely a first pressure value, a second pressure value, a third pressure value, and a fourth pressure value, wherein the second pressure value is less than a preset optimal pressure value, and the third pressure value is greater than the optimal pressure value;

[0013] When the hot air pressure is greater than the fourth pressure value, or the hot air pressure is less than the first pressure value, the control strategy is the override mode;

[0014] When the hot air pressure is greater than or equal to the second pressure value and less than or equal to the third pressure value, the control strategy is the incremental mode;

[0015] When the hot air pressure is greater than or equal to the first pressure value and less than the second pressure value, or the hot air pressure is greater than the third pressure value and less than or equal to the fourth pressure value, the control strategy is the locking mode.

[0016] Optionally, the operating information further includes an override speed, a historical target opening value, and a historical first opening value; and obtaining the second opening value of the hot air damper based on the control strategy, the operating information, and the first opening value includes:

[0017] When the control strategy is the override mode, the second opening value is obtained according to the historical target opening value and the override speed;

[0018] When the control strategy is the incremental mode, the second opening value is obtained according to the historical target opening value, the historical first opening value and the first opening value;

[0019] When the control strategy is the locking mode, the second opening value is obtained according to the historical target opening value, the historical first opening value, and the first opening value.

[0020] Optionally, the override speed includes an override opening speed and an override closing speed; when the control strategy is the override mode, obtaining the second opening value according to the historical target opening value and the override speed includes:

[0021] When the control strategy is the override mode and the hot air pressure is less than the first pressure value, the override closing control is adopted, and the second opening value satisfies:

[0022] U t =U t-1 -U down ;

[0023] Among them, U t Indicates the second opening value, U t-1 Indicates the historical target opening value, U down represents the override speed, and U down >0;

[0024] When the control strategy is the override mode and the hot air pressure is greater than the fourth pressure value, the override opening control is adopted, and the second opening value satisfies:

[0025] U t =U t-1 +U up ;

[0026] Among them, U t Indicates the second opening value, U t-1 Indicates the historical target opening value, U up represents the overrun speed, and U up >0.

[0027] Optionally, when the control strategy is the incremental mode, obtaining the second opening value according to the historical target opening value, the historical first opening value, and the first opening value includes:

[0028] When the control strategy is the incremental mode, incremental control is adopted, and the second opening value satisfies:

[0029] U t =U t-1 +(X t -X t-1 );

[0030] Among them, U t Indicates the second opening value, U t-1 Indicates the historical target opening value, X t represents the first opening value, X t-1 Indicates the first historical opening value.

[0031] Optionally, when the control strategy is the locking mode, obtaining the second opening value according to the historical target opening value, the historical first opening value, and the first opening value includes:

[0032] When the control strategy is the locking mode and the hot air pressure is greater than or equal to the first pressure value and less than the second pressure value, locking increase control is adopted;

[0033] When the control strategy is the locking mode and the hot air pressure is greater than the third pressure value and less than or equal to the fourth pressure value, locking reduction control is adopted;

[0034] When the lock-up control or the lock-down control is adopted, the second opening value satisfies:

[0035] U t =U t-1 +(X t -X t-1 );

[0036] Among them, U t Indicates the second opening value, U t-1 Indicates the historical target opening value, X t represents the first opening value, X t-1 Indicates the first historical opening value.

[0037] Optionally, determining the target instruction of the hot air damper based on the control strategy and the opening value information includes:

[0038] When the override open control or the override close control is adopted, the target opening value of the target instruction is equal to the second opening value;

[0039] When the incremental control is adopted, the target opening value is equal to the second opening value;

[0040] When the locking increase control is adopted, the target opening value is equal to the smallest opening value between the second opening value and the historical target opening value;

[0041] When the lock-down control is adopted, the target opening value is equal to the largest one of the second opening value and the historical target opening value.

[0042] Optionally, obtaining a first opening value of the hot air damper according to the fuel information includes:

[0043] The fuel information is input into a preset opening value calculation model to obtain the first opening value, wherein the opening value calculation model satisfies:

[0044]

[0045] Among them, F (x) represents the opening value calculation model, and x represents the fuel information.

[0046] Compared with the prior art, the control method for the boiler hot air damper provided by the present invention first obtains the operating information of the power boiler including fuel information and hot air pressure, and then obtains the first opening value of the hot air damper according to the fuel information, so that the control of the hot air damper matches the fuel demand; then determines the corresponding control strategy according to the hot air pressure, realizes the division of appropriate control modes according to the hot air pressure conditions, improves the diversity of the hot air damper control strategy, and optimizes the control characteristics of the hot air damper; obtains the second opening value of the hot air damper through the control strategy, operating information and the first opening value, so as to achieve the maximum balance between fuel combustion requirements and safety performance requirements under different control modes; after obtaining the second opening value, it is not simply used as the target opening value of the target instruction, but is optimized based on the control strategy to obtain the final target instruction, thereby improving the rationality of the hot air damper control and further optimizing the control characteristics of the hot air damper; finally, the operation of the hot air damper is controlled according to the target instruction, so as to realize automatic adjustment of the hot air damper under different operating conditions, while meeting the fuel full combustion requirements to the maximum extent, also ensuring the safety of boiler operation, improving the boiler combustion economy, and reducing the labor intensity of operators.

[0047] On the other hand, the present invention also provides a control device for a boiler hot air damper, comprising:

[0048] An acquisition module, which is used to obtain operating information of the power boiler, the operating information including fuel information and hot air pressure;

[0049] a first opening value generating module, configured to obtain a first opening value of the hot air damper according to the fuel information;

[0050] a strategy generation module, configured to determine a corresponding control strategy according to the hot air pressure, wherein the control strategy includes an override mode, an increment mode, and a locking mode;

[0051] a second opening value generating module, configured to obtain a second opening value of the hot air damper based on the control strategy, the operating information, and the first opening value;

[0052] a target instruction generating module, configured to determine a target instruction for the hot air damper based on the control strategy and the opening value information, wherein the opening value information includes the second opening value, and the target instruction includes the target opening value of the hot air damper;

[0053] An execution module is used to control the operation of the hot air damper according to the target instruction, which includes controlling the opening of the hot air damper to be equal to the target opening value.

[0054] The control device for the boiler hot air damper of the present invention and the control method for the boiler hot air damper have the same advantages over the prior art, which will not be described in detail here.

[0055] On the other hand, the present invention also provides an air supply system control method, comprising:

[0056] The air volume is adjusted by controlling the blower, and the hot air pressure is adjusted by controlling the hot air damper, wherein the operation of the hot air damper is controlled by using the control method of the boiler hot air damper as described above.

[0057] Compared to the prior art, the air supply system control method of the present invention controls the air volume through the blower and the air pressure through the hot air damper, enabling simultaneous automated control of two important parameters in the combustion-supporting air of the boiler, namely, the air volume and hot air pressure. This enables full, automated control of all boiler air supply elements, ensuring continuous automated control of boiler combustion and ensuring safe and economical operation. The other advantages of the air supply system control method of the present invention are the same as those of the boiler hot air damper control method over the prior art and are not further elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 This is a flow chart of a method for controlling a boiler hot air damper according to an embodiment of the present invention;

[0059] Figure 2 Schematic diagram of the relationship between the pressure sequence and the optimal pressure value of the control method of the boiler hot air damper according to an embodiment of the present invention;

[0060] Figure 3 Schematic diagram of the structure of a control device for a boiler hot air damper according to an embodiment of the present invention. DETAILED DESCRIPTION

[0061] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Although certain 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 construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0062] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0063] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0064] It should be noted that the modifications of "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0065] like Figure 1 As shown, an embodiment of the present invention provides a method for controlling a hot air damper of a boiler, comprising:

[0066] S100: Acquire operating information of the power boiler, where the operating information includes fuel information and hot air pressure.

[0067] In one embodiment, the fuel information referred to in the present invention includes fuel type, fuel quantity, or fuel opening instruction, wherein the fuel type includes solid fuel, liquid fuel, or gaseous fuel.

[0068] Specifically, the operating information of the power boiler can be obtained through sensors, instrument panels or from the control system platform, for example, the gas valve opening value and the hot air pressure value.

[0069] In this embodiment, by obtaining the operating information of the power boiler, including fuel information and hot air pressure information, a data basis is provided for the subsequent generation of target instructions for the hot air damper, thereby avoiding the problems of poor hot air damper adjustment characteristics and poor safety caused by the traditional control method that relies solely on the extreme hot air pressure value as the only basis for adjusting the hot air damper.

[0070] S200: Obtaining a first opening value of the hot air damper according to the fuel information.

[0071] Specifically, a first opening value of the hot air damper is obtained according to the fuel information, and the obtained first opening value matches the fuel information to meet the fuel combustion requirement.

[0072] In this embodiment, a first opening value that matches the fuel information is obtained based on the fuel information. The obtained first opening value will provide a basis for generating subsequent target instructions, so that the adjustment of the hot air damper adapts to the fuel combustion requirements, which is beneficial to improving the combustion economy of the boiler.

[0073] S300: Determine a corresponding control strategy according to the hot air pressure, wherein the control strategy includes an override mode, an incremental mode and a locking mode.

[0074] In one embodiment, the override mode referred to in the present invention means that when the control system receives an abnormal signal such as an accident alarm, a deviation exceeding a limit, a fault, etc., the system will enter the override control mode, and the control system will switch to a pre-set safety state, for example: no increase or no decrease; the locking mode referred to in the present invention means that a certain detection quantity is greater than or less than a certain deviation value of the reference quantity, that is, the corresponding detection quantity or reference quantity is locked to continue to increase or decrease, and action in the direction of increasing the deviation is prevented.

[0075] In this embodiment, the corresponding hot air damper control strategy is determined according to the hot air pressure, including the override model, the incremental mode and the locking mode, and the hot air pressure under different operating conditions is divided into at least three different control modes, thereby improving the diversity and rationality of the hot air damper control strategy and optimizing the hot air damper control characteristics.

[0076] S400: Based on the control strategy, the operating information and the first opening value, obtain a second opening value of the hot air baffle.

[0077] Specifically, after obtaining the first opening value that matches the fuel information, the control strategy corresponding to the hot air damper is determined according to the hot air pressure, and the second opening value of the hot air damper is obtained based on the operation information; for example, when the control strategy of the hot air damper is in the override mode, it means that the hot air pressure may be in a state of deviation exceeding the limit. At this time, controlling the hot air pressure to ensure the safe operation of the boiler should be the primary task of boiler combustion control, and the first opening value that matches the fuel information has a relatively small impact on the generation of the second opening value.

[0078] In this embodiment, the second opening value of the hot air damper is obtained through the control strategy, operating information and the first opening value, and the fuel information and hot air pressure, two important influencing factors of the hot air damper control, are organically combined to achieve the maximum balance between the fuel combustion requirements and the boiler operation safety performance requirements under different control modes.

[0079] S500: Determine a target instruction for the hot air damper based on the control strategy and the opening value information, wherein the opening value information includes the second opening value, and the target instruction includes the target opening value of the hot air damper.

[0080] In one embodiment, the target instruction to be ultimately executed by the hot air damper is determined based on the control strategy and the opening value information, wherein the opening value information includes the second opening value. The target instruction ultimately obtained includes the target opening value of the hot air damper, which serves as the basis for the final hot air file opening adjustment.

[0081] Optionally, the target command may also include an alarm command, which has a higher priority than the target opening value. For example, if a fuel valve malfunctions during a control cycle and an alarm command is issued, the target command will execute the alarm command, and the target opening value will not affect the final hot air damper adjustment.

[0082] Optionally, the target command may also include a speed command for adjusting the hot air damper. The speed command for the target command can be generated based on the control strategy, and the speed can be preset to different gears. For example, when the hot air damper is in override mode, indicating a threat to boiler operational safety, rapid action of the hot air damper is required, increasing or closing the hot air damper, and controlling the hot air damper movement using the highest speed setting. Conversely, when the hot air damper is in increment mode, indicating ideal operating conditions, a lower speed setting can be used to adjust the hot air damper movement, thereby increasing the service life of the hot air damper.

[0083] Optionally, after generating the target instruction, the historical target opening value can also be obtained, and it can be determined whether the rate of change of the hot air damper opening value of the target opening value and the historical target opening value exceeds the preset limit. If it exceeds the preset limit, the third damper opening value is reduced, and a secondary target instruction generation operation is performed within the control cycle. If the target opening value of the target instruction generated for the second time differs from the target opening value generated for the first time in this control cycle by more than the preset value, the adjustment of the hot air damper opening is stopped, and an alarm signal is issued; if it does not exceed the preset value, the hot air damper opening value is continued to be adjusted until the target instruction is completed. This can avoid the situation where the hot air damper adjustment sensitivity is too high due to a large short-term fluctuation of a certain operating parameter or a large error in the measuring device, resulting in poor boiler combustion efficiency, and improve the economy and stability of boiler combustion control.

[0084] In this embodiment, the final target instruction of the hot air damper is determined based on the control strategy and the opening value information including the second opening value. After obtaining the second opening value, this embodiment does not simply use it as the target opening value of the target instruction, but optimizes it based on the control strategy to obtain the final target instruction, further improving the rationality of the hot air damper control and optimizing the control characteristics of the hot air damper.

[0085] S600: According to the target instruction, control the operation of the hot air damper, which includes controlling the opening of the hot air damper to be equal to the target opening value.

[0086] In one embodiment, the operation of the hot air damper is controlled according to the target instruction. For example, according to the target instruction, the opening size of the hot air damper is controlled to be equal to the target opening value, so as to realize scientific and reasonable automatic adjustment of the operation of the hot air damper under different operating conditions.

[0087] The control method for the boiler hot air damper provided in this embodiment first obtains operating information of the power boiler, including fuel information and hot air pressure, and then obtains a first opening value of the hot air damper based on the fuel information, so that the control of the hot air damper matches the fuel demand; then determines a corresponding control strategy based on the hot air pressure, realizes the division of appropriate control modes according to the hot air pressure conditions, improves the diversity of the hot air damper control strategy, and optimizes the hot air damper control characteristics; obtains a second opening value of the hot air damper through the control strategy, operating information and the first opening value, and realizes that under different control modes, the fuel combustion demand and the safety performance demand are taken into account to the greatest extent; after obtaining the second opening value, it is not simply used as the target opening value of the target instruction, but is optimized based on the control strategy to obtain the final target instruction, thereby improving the rationality of the hot air damper control and further optimizing the control characteristics of the hot air damper; finally, the operation of the hot air damper is controlled according to the target instruction, so that the hot air damper is automatically adjusted under different operating conditions, while meeting the fuel combustion demand to the greatest extent, ensuring the safety of the boiler operation, improving the boiler combustion economy, and reducing the labor intensity of the operator.

[0088] Optionally, determining a corresponding control strategy according to the hot air pressure includes:

[0089] Determining a magnitude relationship between the hot air pressure and a preset pressure sequence, the pressure sequence including at least four incrementally distributed pressure values, namely a first pressure value, a second pressure value, a third pressure value, and a fourth pressure value, wherein the second pressure value is less than a preset optimal pressure value, and the third pressure value is greater than the optimal pressure value;

[0090] When the hot air pressure is greater than the fourth pressure value, or the hot air pressure is less than the first pressure value, the control strategy is the override mode;

[0091] When the hot air pressure is greater than or equal to the second pressure value and less than or equal to the third pressure value, the control strategy is the incremental mode;

[0092] When the hot air pressure is greater than or equal to the first pressure value and less than the second pressure value, or the hot air pressure is greater than the third pressure value and less than or equal to the fourth pressure value, the control strategy is the locking mode.

[0093] like Figure 2 As shown, in one embodiment, for ease of understanding and description, the first pressure value is recorded as Y1, the second pressure value is recorded as Y2, the third pressure value is recorded as Y3, the fourth pressure value is recorded as Y4, the optimal pressure value is recorded as Y0, and the hot air pressure is recorded as y.

[0094] Specifically, the corresponding control strategy is determined by judging the magnitude relationship between the hot air pressure and a preset pressure sequence, wherein the pressure sequence includes at least four incrementally distributed pressure values, namely: Y1, Y2, Y3 and Y4, and the relationship between the pressure sequence and the optimal pressure value satisfies: Y1<Y2<Y0<Y3<Y4. When y>Y4 or y<Y1, it indicates that the hot air deviation is too large and protective measures should be implemented. The corresponding control strategy is the overrun mode; when Y2≥y>Y3, it indicates that the hot air pressure is within the optimal range and the hot air pressure only needs to be adjusted to adapt to fuel changes. The corresponding control strategy is the incremental mode; when Y2>y≥Y1 or Y4≥y>Y3, it indicates that the hot air pressure is not within the optimal pressure range, but has not exceeded the limit value that requires protection. While trying to meet the fuel combustion requirements, it is necessary to prevent the hot air pressure deviation from continuing to expand. The corresponding control strategy is the locking mode.

[0095] In this embodiment, by judging the severity of the deviation between the hot air pressure and the optimal pressure value, the hot air damper control strategy is divided into at least three modes, which ensures the safe operation of the boiler while meeting the fuel combustion requirements to the greatest extent, improving the boiler combustion economy, and enhancing the flexibility of the hot air damper adjustment process.

[0096] Optionally, the operating information further includes an override speed, a historical target opening value, and a historical first opening value; and obtaining the second opening value of the hot air damper based on the control strategy, the operating information, and the first opening value includes:

[0097] When the control strategy is the override mode, the second opening value is obtained according to the historical target opening value and the override speed;

[0098] When the control strategy is the incremental mode, the second opening value is obtained according to the historical target opening value, the historical first opening value and the first opening value;

[0099] When the control strategy is the locking mode, the second opening value is obtained according to the historical target opening value, the historical first opening value, and the first opening value.

[0100] In one embodiment, the override speed referred to in the present invention indicates that in the override mode, the opening and closing speed of the hot air damper is forcibly adjusted. For example, in the override mode, the change in the opening of the hot air damper caused by the fuel change is almost not concerned. In order to ensure the safe operation of the boiler, based on the target instruction (historical target opening value) obtained in the previous control cycle, the hot air damper opening value is forcibly increased or closed by 20% in the current control cycle, that is, the override speed is 20% / control cycle.

[0101] In one embodiment, when the control strategy is in incremental mode, it indicates that the hot air pressure is within a better range at this time, and the fuel combustion demand can be met first. It is only necessary to combine the target opening value (historical target opening value) generated in the previous cycle with the first opening value of the matching fuel information generated in this control cycle to obtain the second opening value.

[0102] In one embodiment, when the control strategy is in the locking mode, it indicates that the hot air pressure deviates from the optimal hot air pressure range. While meeting the fuel combustion requirements as much as possible, it is also necessary to prevent the deviation from expanding. The second opening value is obtained based on the historical target opening value, the historical first opening value, and the first opening value generated in this control cycle.

[0103] In this embodiment, the three different control modes corresponding to the control strategy correspond to different main tasks. The override control needs to ensure the safe operation of the boiler, the incremental mode prioritizes meeting the fuel combustion demand, and the locking mode avoids further expansion of the deviation while meeting the fuel combustion demand as much as possible. The three operating modes have different main tasks and focus on different indicators. While ensuring the safe operation of the boiler during the hot air damper adjustment process, the fuel combustion demand can be met to the greatest extent, making the hot air damper control process more flexible.

[0104] Optionally, the override speed includes an override opening speed and an override closing speed; when the control strategy is the override mode, obtaining the second opening value according to the historical target opening value and the override speed includes:

[0105] When the control strategy is the override mode and the hot air pressure is less than the first pressure value, the override closing control is adopted, and the second opening value satisfies:

[0106] U t =U t-1 -U down ;

[0107] Among them, U t Indicates the second opening value, U t-1 Indicates the historical target opening value, U down represents the override speed, and U down >0;

[0108] When the control strategy is the override mode and the hot air pressure is greater than the fourth pressure value, the override opening control is adopted, and the second opening value satisfies:

[0109] U t =U t-1 +U up ;

[0110] Among them, Ut Indicates the second opening value, U t-1 Indicates the historical target opening value, U up represents the overrun speed, and U up >0.

[0111] In one embodiment, the first opening value, the second opening value, and the historical target opening value referred to in the present invention represent the flow capacity of the hot air damper at the position or state, which is a percentage of the total flow capacity when the hot air damper is fully opened. For example: U t =60%, indicating that the hot air baffle flow capacity is 60% of the total flow capacity.

[0112] In one embodiment, the override closing control referred to in the present invention means that the hot air pressure is lower than the minimum limit, and the override closing control needs to be adopted to forcibly close the hot air damper according to the preset closing speed of the hot air damper to prevent the hot air pressure from further decreasing; the override opening control referred to in the present invention means that the hot air pressure is higher than the maximum limit, and the override opening control needs to be adopted to forcibly open the hot air damper according to the preset opening speed of the hot air damper to prevent the hot air pressure from further increasing. up and U down The unit can be: opening value change / second; preferably, U up and U down The unit is: opening value change / control cycle.

[0113] Specifically, for ease of understanding and description, the first pressure value is recorded as Y1, the fourth pressure value is recorded as Y4, and the hot air pressure is recorded as y. When in the override mode and y < Y1, the override close control is adopted; for example, Y1 = 1.8 kPa, and y = 1.6 kPa is obtained, then the second opening value U t satisfy:

[0114] U t =U t-1 -U down =60%-20%=40%;

[0115] Among them, U t Indicates the second opening value, U t-1 Indicates the historical target opening value, and U t-1 =60%, U down Indicates the overrun speed, and U down =20% / control cycle.

[0116] Finally, the second opening value of the hot air damper in this control period is 40%.

[0117] In this embodiment, after determining that the control mode corresponding to the control strategy is the override mode, the override mode can be divided into two operating conditions according to the size relationship between the hot air pressure and the pressure sequence. Override opening control or override closing control is adopted according to the hot air pressure situation. On the basis of the historical target opening value, the hot air damper is forced to open or close through the preset override opening speed or override closing speed. Under these two operating conditions, the fuel combustion demand weight is relatively low, and the focus is on boiler operation protection. The control method of this embodiment simulates the manual operation process, from observing the operating parameters to judging the operating conditions, and finally making the optimal decision based on the operating conditions, thereby realizing intelligent automatic control of the hot air damper.

[0118] Optionally, when the control strategy is the incremental mode, obtaining the second opening value according to the historical target opening value, the historical first opening value, and the first opening value includes:

[0119] When the control strategy is the incremental mode, incremental control is adopted, and the second opening value satisfies:

[0120] U t =U t-1 +(X t -X t-1 );

[0121] Among them, U t Indicates the second opening value, U t-1 Indicates the historical target opening value, X t represents the first opening value, X t-1 Indicates the first historical opening value.

[0122] In one embodiment, the first opening value, the second opening value, the historical first opening value, and the historical target opening value referred to in the present invention represent the flow capacity of the hot air damper at the position or state, as a percentage of the flow capacity when the hot air damper is fully opened, for example: X t =50%, indicating that in order to meet the fuel combustion requirements, the hot air damper opening value should be equal to 50%.

[0123] In this embodiment, the incremental mode referred to in the present invention means that the boiler hot air pressure is within the optimal pressure range, for example: 1.9kPa-2.0kPa, preferably, the optimal pressure value is 1.95kPa. Under this operating condition, the boiler combustion operation is safe, and the hot air pressure provided by the air supply system can keep the fuel combustion rate at a high level, which is a relatively ideal operating condition for boiler combustion operation. Under this operating condition, the second opening value only needs to be increased or decreased according to the change of fuel information, that is, the change of the first opening value (X) matching the fuel information is paid attention to. t -X t-1), so that the hot air pressure provided by the boiler air supply system can always be maintained within the optimal pressure range, which is beneficial to improving the boiler combustion economy.

[0124] Optionally, when the control strategy is the locking mode, obtaining the second opening value according to the historical target opening value, the historical first opening value, and the first opening value includes:

[0125] When the control strategy is the locking mode and the hot air pressure is greater than or equal to the first pressure value and less than the second pressure value, locking increase control is adopted;

[0126] When the control strategy is the locking mode and the hot air pressure is greater than the third pressure value and less than or equal to the fourth pressure value, locking reduction control is adopted;

[0127] When the lock-up control or the lock-down control is adopted, the second opening value satisfies:

[0128] U t =U t-1 +(X t -X t-1 );

[0129] Among them, U t Indicates the second opening value, U t-1 Indicates the historical target opening value, X t represents the first opening value, X t-1 Indicates the first historical opening value.

[0130] In one embodiment, the first opening value, the second opening value, the historical first opening value, and the historical target opening value referred to in the present invention represent the flow capacity of the hot air damper at the position or state, as a percentage of the flow capacity when the hot air damper is fully opened, for example: U t-1 =30%, indicating that in the previous control cycle, taking fuel demand and safety into consideration, the target opening value of the hot air damper is ultimately equal to 30%.

[0131] In this embodiment, the locking mode can be divided into two working conditions according to the hot air pressure. When the hot air pressure is too high, the locking reduction control is adopted to prevent the hot air damper from further decreasing in opening, which causes the hot air pressure to continue to rise. When the hot air pressure is too low, the locking increase control is adopted to prevent the hot air damper from further increasing in opening, which causes the hot air pressure to continue to fall. However, the hot air pressure deviation under these two working conditions has not yet affected the safe operation of the boiler. Therefore, while preventing the hot air pressure deviation from further increasing, it is also necessary to meet the fuel combustion requirements as much as possible, that is, to pay attention to the change of the first opening value (X) matching the fuel information. t -X t-1) to maximize boiler fuel utilization while avoiding excessive hot air pressure deviations. Based on hot air pressure, boiler operation is divided into at least three modes and five operating conditions. Each mode and its corresponding operating condition have their own control methods, optimizing the hot air damper control characteristics and achieving automated, intelligent, and flexible safe and economical operation of the hot air damper.

[0132] Optionally, determining the target instruction of the hot air damper based on the control strategy and the opening value information includes:

[0133] When the override open control or the override close control is adopted, the target opening value of the target instruction is equal to the second opening value;

[0134] When the incremental control is adopted, the target opening value is equal to the second opening value;

[0135] When the locking increase control is adopted, the target opening value is equal to the smallest opening value between the second opening value and the historical target opening value;

[0136] When the lock-down control is adopted, the target opening value is equal to the largest one of the second opening value and the historical target opening value.

[0137] In this embodiment, after obtaining the second opening value that takes into account both fuel combustion requirements and safe operation, the opening value information is optimized based on the control strategy to obtain the final target instruction. For example, the second opening value obtained under the locked-down control condition is not directly used as the target instruction. Instead, it satisfies the fuel demand to a certain extent while preventing the deviation between the hot air pressure and the optimal pressure value from further widening. In the case of a high hot air pressure, the historical target opening value obtained in the previous control cycle and the second opening value obtained in the current control cycle are selected. The one with the largest hot air damper opening is used as the target opening value, and the deviation is continuously reduced, shortening the distance between the boiler operation and its ideal operating condition. Compared with the traditional hot air damper control method, the control method of this embodiment can overcome the inherent deficiency of the poor control characteristics of the hot air damper and realize long-term, full-process, safe and reliable automatic operation of the hot air damper.

[0138] Optionally, obtaining a first opening value of the hot air damper according to the fuel information includes:

[0139] The fuel information is input into a preset opening value calculation model to obtain the first opening value, wherein the opening value calculation model satisfies:

[0140]

[0141] Among them, F (x)represents the opening value calculation model, and x represents the fuel information.

[0142] In one embodiment, the fuel information x referred to in the present invention represents the amount of fuel. For example, the percentage of the amount of coal input in this control cycle to the rated combustion capacity of the boiler, x=20%, means that 20% of the rated combustion capacity of the boiler will be input in this control cycle; the opening value calculation model F referred to in the present invention (x) , represents a calculation model that satisfies the relationship between fuel information and its matching hot air damper opening value X. By inputting fuel information x, the hot air damper opening value X that matches the fuel amount and fuel type can be obtained.

[0143] In one embodiment, the input of the opening value calculation model is the fuel information x. For example, if the gas valve opening value is 50% and the opening value is substituted into the opening value calculation model, the output is the first opening value X of the hot air damper = 90%. (x) The establishment is based on the historical data of the boiler operating in a better hot air pressure range, for example: the hot air pressure is in the range of 1.9kPa-2.0kPa. Preferably, the historical data corresponding to the optimal pressure value of 1.95kPa is selected. Under this operating condition, the boiler combustion operation is safe, and the hot air pressure provided by the air supply system can keep the fuel combustion rate at a high level, which is a more ideal operating condition for boiler combustion. As shown in Table 1, the historical data of the hot air pressure, fuel information x and the corresponding hot air damper opening value X under this operating condition are collected to obtain the corresponding relationship between the fuel information x and the hot air damper opening value X, and statistical analysis is performed on such data to finally obtain the opening value calculation model F. (x) .

[0144] Table 1 Correspondence between fuel information and hot air damper opening value

[0145] x 0％ 10％ 35％ 40％ 50％ 55％ X 10％ 30％ 50％ 80％ 90％ 100％

[0146] Optionally, obtaining the first opening value according to the fuel information further includes:

[0147] Obtaining historical fuel information under the optimal pressure value and its corresponding historical first opening value;

[0148] Constructing an initial opening value calculation model based on the historical first opening value;

[0149] establishing a training data set based on the historical fuel information and the historical first opening value;

[0150] Using the training data set to train and optimize the initial opening value calculation model to obtain an opening value calculation model;

[0151] The fuel information is input into the opening value calculation model to obtain the first opening value.

[0152] In this embodiment, the fuel information is input into a preset opening value calculation model to obtain a first opening value that matches the fuel combustion demand, that is, the fuel combustion demand matches the hot air damper opening value, providing a data basis for subsequent target instruction generation, improving boiler fuel utilization, and having high economic value.

[0153] In one embodiment, the present invention further provides a control device for a boiler hot air damper, comprising:

[0154] An acquisition module, which is used to obtain operating information of the power boiler, the operating information including fuel information, hot air pressure and historical target opening value of the hot air damper;

[0155] a first opening value generating module, configured to obtain a first opening value of the hot air damper according to the fuel information;

[0156] a strategy generation module, configured to determine a corresponding control strategy according to the hot air pressure, wherein the control strategy includes an override mode, an increment mode, and a locking mode;

[0157] a second opening value generating module, configured to obtain a second opening value of the hot air damper based on the control strategy, the operating information, and the first opening value;

[0158] a target instruction generating module, configured to determine a target instruction for the hot air damper based on the control strategy and the opening value information, wherein the opening value information includes the second opening value, and the target instruction includes the target opening value of the hot air damper;

[0159] An execution module is used to control the operation of the hot air damper according to the target instruction, which includes controlling the opening of the hot air damper to be equal to the target opening value.

[0160] like Figure 3As shown, in this embodiment, the acquisition module of the control device of the boiler hot air damper first obtains the operating information of the power boiler including fuel information and hot air pressure, and the first opening value generation module then obtains the first opening value of the hot air damper according to the fuel information, so that the control of the hot air damper matches the fuel demand; the strategy generation module then determines the corresponding control strategy according to the hot air pressure, realizes the division of appropriate control modes according to the hot air pressure situation, improves the diversity of the hot air damper control strategy, and optimizes the hot air damper control characteristics; the second opening value generation module obtains the second opening value of the hot air damper based on the control strategy, operating information and the first opening value, realizes the Under the control mode, the fuel combustion demand and safety performance demand are taken into account to the greatest extent; after obtaining the second opening value, the target instruction generation module does not simply use it as the target opening value directly, but optimizes it based on the control strategy to obtain the final target instruction, improve the rationality of the hot air damper control, and further optimize the control characteristics of the hot air damper; finally, the execution module controls the operation of the hot air damper according to the target instruction, and automatically adjusts the hot air damper under different operating conditions, which not only meets the fuel full combustion demand to the greatest extent, but also ensures the safety of boiler operation, improves the boiler combustion economy, and reduces the labor intensity of operators.

[0161] In one embodiment, the present invention further provides an air supply system control method, comprising:

[0162] The air volume is adjusted by controlling the blower, and the hot air pressure is adjusted by controlling the hot air damper, wherein the operation of the hot air damper is controlled by using the control method of the boiler hot air damper as described above.

[0163] In this embodiment, the air supply volume is controlled by the blower, and the air pressure is controlled by the hot air damper, so that the two elements of the air supply volume and hot air pressure in the combustion-supporting air of the boiler are automatically controlled at the same time. In the traditional air supply system control method, the air supply volume and hot air pressure are adjusted by the hot air damper. Since the inherent control characteristics of the hot air damper show that the air supply volume and air pressure are basically inversely proportional, the traditional control method can only give priority to satisfying the basic element of the air supply volume. The hot air pressure generally only exists as a protective amount. The hot air damper is forced to adjust when it exceeds the hot air pressure limit. The fuel combustion utilization rate cannot be guaranteed, and it is impossible to take into account both safety and economy. In this embodiment, the blower and the hot air damper are independently and automatically controlled to achieve full-factor and full-process automatic control of the boiler air supply, providing a basic automation guarantee for the continuous automatic control of boiler combustion and safe and economical operation.

[0164] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM). In this application, the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiments of the present invention. In addition, the functional units in the various embodiments of the present invention can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into a single unit. The above-mentioned integrated units can be implemented in the form of hardware or software functional units.

[0165] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A method for controlling a hot air damper of a boiler, characterized in that: include: Acquiring operating information of the power boiler, the operating information including fuel information, hot air pressure, overrun speed, and historical target opening value; obtaining a first opening value of the hot air damper according to the fuel information; Determining a corresponding control strategy according to the hot air pressure, wherein the control strategy includes an override mode, an incremental mode, and a locking mode; determining the corresponding control strategy according to the hot air pressure includes: judging a magnitude relationship between the hot air pressure and a preset pressure sequence, wherein the pressure sequence includes at least four incrementally distributed pressure values, and the at least four pressure values ​​include a first pressure value, a second pressure value, a third pressure value, and a fourth pressure value, wherein the second pressure value is less than a preset optimal pressure value, and the third pressure value is greater than the optimal pressure value; when the hot air pressure is greater than the fourth pressure value, or the hot air pressure is less than the first pressure value, the control strategy is the override mode; Based on the control strategy, the operating information, and the first opening value, a second opening value of the hot air damper is obtained; including: when the control strategy is the override mode, the second opening value is obtained according to the historical target opening value and the override speed; wherein the override speed includes an override opening speed and an override closing speed; when the control strategy is the override mode and the hot air pressure is less than the first pressure value, an override closing control is adopted, and the second opening value satisfies: ;in, represents the second opening value, represents the historical target opening value, represents the override closing speed, and When the control strategy is the override mode and the hot air pressure is greater than the fourth pressure value, the override open control is adopted, and the second opening value satisfies: ;in, represents the second opening value, represents the historical target opening value, represents the override opening speed, and ; determining a target instruction for the hot air damper based on the control strategy and the opening value information, wherein the opening value information includes the second opening value, and the target instruction includes the target opening value of the hot air damper; According to the target instruction, the operation of the hot air damper is controlled, which includes controlling the opening of the hot air damper to be equal to the target opening value.

2. The control method of the boiler hot air damper according to claim 1, characterized in that: After determining the magnitude relationship between the hot air pressure and the preset pressure sequence, the method further includes: When the hot air pressure is greater than or equal to the second pressure value and less than or equal to the third pressure value, the control strategy is the incremental mode; When the hot air pressure is greater than or equal to the first pressure value and less than the second pressure value, or the hot air pressure is greater than the third pressure value and less than or equal to the fourth pressure value, the control strategy is the locking mode.

3. The control method of the boiler hot air damper according to claim 2, characterized in that: The operation information further includes a historical first opening value; and obtaining the second opening value of the hot air damper based on the control strategy, the operation information, and the first opening value further includes: When the control strategy is the incremental mode, the second opening value is obtained according to the historical target opening value, the historical first opening value and the first opening value; When the control strategy is the locking mode, the second opening value is obtained according to the historical target opening value, the historical first opening value, and the first opening value.

4. The control method of the boiler hot air damper according to claim 3, characterized in that: When the control strategy is the incremental mode, obtaining the second opening value according to the historical target opening value, the historical first opening value, and the first opening value includes: When the control strategy is the incremental mode, incremental control is adopted, and the second opening value satisfies: ； in, represents the second opening value, represents the historical target opening value, represents the first opening value, Indicates the first historical opening value.

5. The control method of the boiler hot air damper according to claim 4, characterized in that: When the control strategy is the locking mode, obtaining the second opening value according to the historical target opening value, the historical first opening value, and the first opening value includes: When the control strategy is the locking mode and the hot air pressure is greater than or equal to the first pressure value and less than the second pressure value, locking increase control is adopted; When the control strategy is the locking mode and the hot air pressure is greater than the third pressure value and less than or equal to the fourth pressure value, locking reduction control is adopted; When the lock-up control or the lock-down control is adopted, the second opening value satisfies: ； in, represents the second opening value, represents the historical target opening value, represents the first opening value, Indicates the first historical opening value.

6. The method for controlling a boiler hot air damper according to claim 5, characterized in that: The step of determining a target instruction for the hot air damper based on the control strategy and the opening value information includes: When the override open control or the override close control is adopted, the target opening value of the target instruction is equal to the second opening value; When the incremental control is adopted, the target opening value is equal to the second opening value; When the locking increase control is adopted, the target opening value is equal to the smallest opening value between the second opening value and the historical target opening value; When the lock-down control is adopted, the target opening value is equal to the largest one of the second opening value and the historical target opening value.

7. The method for controlling a boiler hot air damper according to any one of claims 1 to 6, characterized in that: Obtaining a first opening value of the hot air damper according to the fuel information includes: The fuel information is input into a preset opening value calculation model to obtain the first opening value, wherein the opening value calculation model satisfies: ； in, represents the opening value calculation model, Indicates the fuel information.

8. A control device for a boiler hot air damper, characterized in that: include: An acquisition module, which is used to obtain operating information of the power boiler, the operating information including fuel information, hot air pressure, overrun speed, and historical target opening value; a first opening value generating module, configured to obtain a first opening value of the hot air damper according to the fuel information; a strategy generation module, configured to determine a corresponding control strategy based on the hot air pressure, wherein the control strategy includes an override mode, an incremental mode, and a locking mode; determining the corresponding control strategy based on the hot air pressure includes: judging a magnitude relationship between the hot air pressure and a preset pressure sequence, wherein the pressure sequence includes at least four incrementally distributed pressure values, wherein the at least four pressure values ​​include a first pressure value, a second pressure value, a third pressure value, and a fourth pressure value, wherein the second pressure value is less than a preset optimal pressure value, and the third pressure value is greater than the optimal pressure value; when the hot air pressure is greater than the fourth pressure value, or the hot air pressure is less than the first pressure value, the control strategy is the override mode; A second opening value generating module, configured to obtain a second opening value of the hot air damper based on the control strategy, the operating information, and the first opening value; comprising: when the control strategy is the override mode, obtaining the second opening value according to the historical target opening value and the override speed; wherein the override speed includes an override opening speed and an override closing speed; when the control strategy is the override mode and the hot air pressure is less than the first pressure value, adopting override closing control, and the second opening value satisfies: ;in, represents the second opening value, represents the historical target opening value, represents the override closing speed, and When the control strategy is the override mode and the hot air pressure is greater than the fourth pressure value, the override open control is adopted, and the second opening value satisfies: ;in, represents the second opening value, represents the historical target opening value, represents the override opening speed, and ; a target instruction generating module, configured to determine a target instruction for the hot air damper based on the control strategy and the opening value information, wherein the opening value information includes the second opening value, and the target instruction includes the target opening value of the hot air damper; An execution module is used to control the operation of the hot air damper according to the target instruction, which includes controlling the opening of the hot air damper to be equal to the target opening value.

9. A method for controlling an air supply system, characterized in that: include: The air supply volume is adjusted by controlling the blower, and the hot air pressure is adjusted by controlling the hot air damper, wherein the operation of the hot air damper is controlled by using the control method for the boiler hot air damper according to any one of claims 1 to 7.

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