Boiler burner cooperative control method and device, electronic equipment and storage medium

Abstract

The invention provides a boiler burner cooperative control method and device, electronic equipment and a storage medium. The method comprises the steps that according to physical parameters of branch gas pipelines corresponding to all layers of combustors in a boiler, initial distribution coefficients of all layers of combustors are determined; combustion state parameters in the boiler operation process are obtained, and the initial distribution coefficients of all layers of combustors are corrected according to the combustion state parameters; according to the total fuel amount required by the current load and determined by the boiler master control and the corrected distribution coefficient, the fuel amount corresponding to each layer of combustor is determined; the fuel quantity is distributed to the combustors on all the layers, and the opening degree increment of fuel valves corresponding to the combustors on all the layers is determined according to the fuel quantity; and according to the opening degree increment, the opening degree of a fuel valve of each layer of combustor is adjusted, so that the fuel supply amount of each layer of combustor is matched with the fuel amount distributed to each layer of combustor. Automatic control can be achieved, the control precision is improved, and the operation efficiency and the combustion efficiency of the boiler combustor are improved.

Description

Technical Field

[0001] The present application relates to the technical field of gas boilers, and in particular to a boiler burner coordinated control method, device, electronic equipment and storage medium. Background Art

[0002] Steel plant gas boilers use the residual exhaust gas generated during the steel production process to generate electricity through combustion. In boiler design, multiple layers of burners are usually dispersed in the furnace, and each layer of burners burns by mixing gas and air. However, due to the large number of burners, the diameters of the branch gas pipes connected to the burners on different layers or walls are different, resulting in complex and inconsistent adjustment during operation.

[0003] In actual operation, the burner adjustment method mainly relies on manual operation. Operators need to manually adjust the gas valve and air distribution valve of the burner to cope with the discontinuity of steel plant production and gas pressure fluctuations, while meeting the requirements of the dispatching center for unit load changes. This method is labor-intensive, has limited adjustment accuracy, and is prone to over-adjustment or under-adjustment due to human differences. In addition, due to the different diameters of branch gas pipelines, operators need to use long-term experience to determine the appropriate fuel distribution ratio, which increases the difficulty and risk of operation.

[0004] In the prior art, some automatic control schemes adopt a multi-valve synchronous linkage mode to achieve synchronous adjustment of multiple burner valves through a master control signal, but this type of scheme has the following problems: First, the influence of the burner on the main steam temperature, boiler negative pressure and oxygen content is not fully considered, and refined control cannot be achieved; second, the physical structure and process characteristics of the burners at different layers are not optimized, making it difficult to quickly respond to load changes or ensure combustion stability; finally, the differences in the diameters of branch gas pipelines are ignored, resulting in uneven fuel distribution, affecting combustion efficiency and boiler performance. Summary of the invention

[0005] In view of this, the embodiments of the present application provide a boiler burner collaborative control method, device, electronic device and storage medium to solve the problems in the prior art of high labor intensity of manual adjustment, inability to accurately control, and reduced operating efficiency and combustion efficiency of the boiler burner.

[0006] According to a first aspect of an embodiment of the present application, a method for coordinated control of boiler burners is provided, comprising: determining an initial distribution coefficient of each layer of burners according to physical parameters of branch gas pipelines corresponding to each layer of burners in the boiler; obtaining combustion state parameters during boiler operation, and correcting the initial distribution coefficient of each layer of burners according to the combustion state parameters; determining the amount of fuel corresponding to each layer of burners according to the total amount of fuel required for the current load determined by the boiler master control and the corrected distribution coefficient; distributing the fuel amount to each layer of burners, and determining an opening increment of a fuel valve corresponding to each layer of burners according to the fuel amount; and adjusting the opening of the fuel valve of each layer of burners according to the opening increment, so that the fuel supply amount of each layer of burners matches the amount of fuel distributed to each layer of burners.

[0007] According to a second aspect of an embodiment of the present application, a boiler burner cooperative control device is provided, comprising: a first determination module, configured to determine the initial distribution coefficient of each layer of burners according to the physical parameters of the branch gas pipelines corresponding to each layer of burners in the boiler; a correction module, configured to obtain the combustion state parameters during the operation of the boiler, and correct the initial distribution coefficient of each layer of burners according to the combustion state parameters; a second determination module, configured to determine the fuel amount corresponding to each layer of burners according to the total amount of fuel required for the current load determined by the boiler master control and the corrected distribution coefficient; a distribution module, configured to distribute the fuel amount to each layer of burners, and determine the opening increment of the fuel valve corresponding to each layer of burners according to the fuel amount; and an adjustment module, configured to adjust the opening of the fuel valve of each layer of burners according to the opening increment, so that the fuel supply amount of each layer of burners matches the fuel amount allocated to each layer of burners.

[0008] According to a third aspect of an embodiment of the present application, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the steps of the above method are implemented when the processor executes the computer program.

[0009] According to a fourth aspect of an embodiment of the present application, a computer-readable storage medium is provided, which stores a computer program, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0010] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects:

[0011] By determining the initial distribution coefficient of each layer of burners according to the physical parameters of the branch gas pipelines corresponding to each layer of burners in the boiler; obtaining the combustion state parameters during the operation of the boiler, and correcting the initial distribution coefficient of each layer of burners according to the combustion state parameters; determining the amount of fuel corresponding to each layer of burners according to the total amount of fuel required for the current load determined by the boiler master control and the corrected distribution coefficient; distributing the fuel amount to each layer of burners, and determining the opening increment of the fuel valve corresponding to each layer of burners according to the fuel amount; adjusting the opening of the fuel valve of each layer of burners according to the opening increment, so that the fuel supply of each layer of burners matches the amount of fuel allocated to each layer of burners. This application can realize automatic control, improve control accuracy, and improve the operating efficiency and combustion efficiency of boiler burners. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 It is a flow chart of a boiler burner coordinated control method provided in an embodiment of the present application;

[0014] Figure 2 It is a structural schematic diagram of a boiler burner cooperative control device provided in an embodiment of the present application;

[0015] Figure 3 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0016] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0017] In the production process of steel mills, gas boilers are one of the key equipment. Their main function is to use the residual tail gas (such as blast furnace gas or converter gas) generated during the steel production process for combustion to drive steam generators to generate electricity. When designing a boiler, multiple layers and multiple burners are usually arranged in the furnace. These burners mix gas and air and ignite them to achieve efficient use of energy.

[0018] In actual operation, due to the complexity of burner arrangement and the different number of burners on the front and rear walls or upper and lower layers, the diameters of the branch pipes for gas to enter the furnace are different. This structural difference makes it more difficult for operators to adjust the burner, especially in the following aspects:

[0019] 1. Adjustment complexity: There are a large number of burners, and each person's operating methods and habits may be different during manual adjustment, which can easily lead to inconsistent adjustments.

[0020] 2. Combustion stability: Operators need to manually adjust the gas flow and air volume to maintain the intensity of the combustion flame, reduce flame collision problems, and cope with external load fluctuations and combustion parameter stability requirements.

[0021] 3. System response: Combustion adjustment also needs to consider the need for rapid response to load changes. Traditional manual operation is time-consuming and difficult to accurately match.

[0022] These problems lead to low operating efficiency in existing technologies and limited optimization of boiler performance. Although current automation solutions have made some progress, the following problems are still common:

[0023] First, the steel plant's gas pressure fluctuates greatly, and coupled with the discontinuous and unstable nature of gas, operators need to frequently manually adjust the gas regulating valve and air distribution valve. This not only increases labor intensity, but also easily leads to over-adjustment or improper adjustment due to human factors.

[0024] Secondly, some existing automatic control systems only realize simple multi-valve synchronous linkage, and do not fully consider the complex combustion characteristics in actual operation. For example: the impact of the upper burner on the main steam temperature, the impact of each burner on the boiler negative pressure and oxygen content, and the difference in the load response speed of burners on different layers.

[0025] Finally, the diameters of steel plant gas pipelines vary, and operators usually need to use experience to figure out the relationship between the opening of the corresponding gas regulating valve and the gas flow rate. This method is inefficient and difficult to guarantee accuracy.

[0026] Therefore, according to the above analysis of the prior art, the prior art still has the following shortcomings: frequent manual operation by operators is required, which makes it difficult to maintain adjustment consistency and has high labor intensity. The automatic control scheme does not comprehensively consider important combustion characteristic parameters such as main steam temperature, boiler negative pressure, and oxygen content, making it difficult to achieve precise control. The difference in branch pipe diameters is not included in the control scheme, resulting in a complex and inefficient gas distribution and adjustment process.

[0027] In view of the problems existing in the prior art, the present application proposes a boiler burner collaborative control method to solve the problems of complex manual operation and insufficient automatic control existing in the prior art. By calculating and correcting the distribution coefficient and adjusting the multi-factor linkage, the optimized control of the burner fuel and air distribution is realized. By combining the combustion characteristics and process physical characteristics, the present application achieves the following purposes: automatically adjust the burner gas flow and air distribution to reduce human intervention. Consider the multi-level influencing factors of the combustion system, such as temperature, negative pressure, oxygen content and load response characteristics. Adapt to branch pipes of different diameters to ensure the accuracy and stability of gas distribution. The technical solution of this application can significantly improve the operating efficiency and combustion stability of the boiler, while reducing the labor intensity of operators.

[0028] The contents of the technical solution of the present application are described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Figure 1 Schematic diagram of the flow chart of the boiler burner coordinated control method provided in the embodiment of the present application. Figure 1 As shown, the boiler burner coordinated control method may specifically include:

[0030] S101, determining the initial distribution coefficient of each layer of burners according to the physical parameters of the branch gas pipelines corresponding to each layer of burners in the boiler;

[0031] S102, obtaining combustion state parameters during boiler operation, and correcting the initial distribution coefficients of burners at each layer according to the combustion state parameters;

[0032] S103, determining the amount of fuel corresponding to each layer of burners according to the total amount of fuel required for the current load determined by the boiler master control and the corrected distribution coefficient;

[0033] S104, distributing the fuel amount to the burners on each layer, and determining the opening increment of the fuel valve corresponding to the burners on each layer according to the fuel amount;

[0034] S105, adjusting the opening of the fuel valve of each layer of burners according to the opening increment, so that the fuel supply amount of each layer of burners matches the fuel amount allocated to each layer of burners.

[0035] In some embodiments, the initial distribution coefficient of each layer of burners is determined according to the physical parameters of the branch gas pipelines corresponding to each layer of burners in the boiler, including:

[0036] According to the diameter of the branch gas pipelines connected to the burners on each layer in the boiler, determine the maximum flow rate of each branch gas pipeline;

[0037] According to the maximum flow rate of each branch gas pipeline and the principle that the fuel input amount of each layer of burners is basically the same, the initial distribution coefficient of each layer of burners is calculated, wherein the initial distribution coefficient meets the preset constraint conditions.

[0038] Specifically, first, the diameter information of the branch gas pipelines connected to the burners at each layer in the boiler is obtained. These diameter data reflect the physical characteristics of the pipelines and are important parameters that affect the fuel flow capacity. For example, the diameters of the branch gas pipelines of the upper burner, the middle burner, and the lower burner are different.

[0039] Next, by analyzing the diameter of the branch gas pipeline, combined with the known physical properties of the gas and operating conditions, the maximum flow rate of each branch gas pipeline is determined. The maximum flow rate is used to characterize the maximum fuel supply capacity that can be obtained by each layer of burners under stable operating conditions.

[0040] On this basis, the fuel proportion allocated to the burners on each layer is allocated according to the principle of ensuring that the fuel input of each layer of burners is basically uniform. Specifically, according to the maximum flow volume of each branch gas pipeline, the fuel allocation ratio of each layer of burners is calculated as the initial allocation coefficient, which is represented by K1, K2, K3...Kn.

[0041] In order to ensure the rationality of the distribution coefficient, the initial distribution coefficient must meet the preset constraints, that is, the sum of the initial distribution coefficients of all layer burners should be 1. This distribution method ensures that the distribution of fuel meets the basic requirements of boiler operation, while avoiding the problem of uneven fuel distribution caused by differences in the physical properties of branch gas pipelines.

[0042] For example, in actual applications, based on the principle that the amount of fuel is basically the same (the principle that the amount of fuel input to each layer of burners is basically uniform), if the diameter of the branch gas pipeline of the upper layer burner is small, while the diameter of the pipelines in the middle and lower layers is relatively large, the initial distribution coefficient will be proportionally distributed according to the relative sizes of the pipeline diameters. The upper layer burner with a smaller branch gas pipeline diameter will obtain a larger initial distribution coefficient, while the middle and lower layer burners with larger branch gas pipeline diameters will obtain a smaller initial distribution coefficient.

[0043] Through the above method of this embodiment, this embodiment successfully calculates the initial distribution coefficients of each layer of burners. These initial distribution coefficients will be used as basic parameters in subsequent combustion control to provide support for further correction of distribution coefficients and dynamic response, thereby improving the efficiency and stability of boiler burner operation.

[0044] In some embodiments, the initial distribution coefficients of the burners in each layer are corrected according to the combustion state parameters, including:

[0045] According to the combustion state parameters, the deviation value and the change rate corresponding to the preset key parameters are determined, and the initial distribution coefficient of each layer of burners is corrected according to the deviation value, the change rate and the preset weight ratio.

[0046] Specifically, first, the combustion state parameters are obtained in real time through the boiler monitoring system. The combustion state parameters include key operating indicators such as load, main steam temperature, and oxygen content, which directly reflect the current combustion state of the boiler. For each key parameter, the deviation between its target value and the actual value is further calculated, and the change rate of the parameter is evaluated to characterize the dynamic trend of the parameter change.

[0047] For example, when a large deviation in the main steam temperature is monitored, its rate of change is analyzed at the same time to determine whether the deviation is rapidly expanding or gradually stabilizing; for the oxygen content, in addition to the deviation value, it is also evaluated whether the rate of change of the oxygen content has a significant impact on the combustion state.

[0048] Next, the influence of each key parameter on the distribution coefficient correction is determined according to the pre-set weight ratio. The weight ratio is set based on boiler operation experience and historical data. Usually, the load deviation and main steam temperature deviation weights are higher, while the oxygen change rate and deviation weights are relatively low.

[0049] During the correction process, the deviation value and change rate of each key parameter are combined with the corresponding weight ratio to calculate the correction amount of each parameter to the initial distribution coefficient of each layer of burners. For example, when the main steam temperature deviation is large and the upper burner has a significant impact on the temperature, the distribution coefficient of the upper burner can be appropriately increased, while the distribution coefficients of the middle and lower burners can be reduced. During the correction, the sum of all distribution coefficients is always kept at 1 to meet the overall balance requirements of fuel distribution.

[0050] In actual operation, if the deviation of the combustion state parameters is small and the rate of change tends to be stable, the correction amplitude will be reduced accordingly to maintain the basic structure of the initial distribution coefficient; when the parameter deviation is large or the rate of change is fast, the system dynamically increases the correction amplitude to quickly respond to changes in the combustion state.

[0051] By using the method of the present embodiment, the initial distribution coefficient is corrected in real time according to the combustion state parameters, and finally a corrected distribution coefficient is obtained. The corrected distribution coefficient can better adapt to the current combustion demand of the boiler, thereby optimizing the fuel distribution of each layer of burners, improving the combustion efficiency and ensuring the stability of the boiler operation.

[0052] In some embodiments, according to the combustion state parameters, determining the deviation value and the change rate corresponding to the preset key parameters includes:

[0053] Obtain key parameters of the combustion state parameters, wherein the key parameters include load, main steam temperature and oxygen content;

[0054] The load deviation value between the target value and the actual value of the load, the main steam temperature deviation value between the target value and the actual value of the main steam temperature, the change rate of the main steam temperature, the oxygen amount deviation value between the target value and the actual value of the oxygen amount, and the change rate of the oxygen amount are determined respectively.

[0055] Specifically, firstly, the combustion state parameters are obtained in real time through the boiler operation monitoring system. These parameters include load, main steam temperature and oxygen content, which respectively reflect the boiler's load response capability, thermal efficiency and oxygen supply during the combustion process, and are key indicators for combustion state control.

[0056] For load parameters, the system obtains the actual value of the current load, compares it with the preset target load value, and calculates the load deviation value ΔFT. The load deviation value is used to measure the gap between the current load demand and the actual operating status of the boiler, reflecting the urgency of load adjustment.

[0057] For the main steam temperature, the system obtains the actual main steam temperature value in operation and compares it with the target temperature value to obtain the main steam temperature deviation value ΔTE. At the same time, the system monitors the change trend of the main steam temperature over time and calculates the change rate SV of the main steam temperature. TE , to assess the severity of temperature fluctuations. When the temperature deviation is large or the rate of change is fast, it may be necessary to adjust the allocation ratio of the relevant burners first to control the temperature.

[0058] For the oxygen content parameter, the system obtains the actual value of the oxygen content and compares it with the preset target oxygen content value to obtain the oxygen content deviation value ΔB02. The oxygen content deviation value reflects whether the oxygen supply is sufficient or excessive during the combustion process. In addition, the system calculates the oxygen content change rate SV based on the real-time change of the oxygen content value. O2 , used to evaluate the effect of oxygen supply stability on combustion conditions.

[0059] Through the above steps, the system determines the load deviation value, main steam temperature deviation value, main steam temperature change rate, oxygen content deviation value and oxygen content change rate. The following example is used to illustrate the situation under certain operating conditions:

[0060] If the actual load value is lower than the target load value, the calculated load deviation value is positive, indicating that the fuel supply needs to be increased;

[0061] If the actual value of the main steam temperature is higher than the target value and the temperature changes rapidly, the burner distribution coefficient needs to be adjusted quickly to reduce the temperature;

[0062] If the actual oxygen content is lower than the target value and the rate of change of the oxygen content tends to be negative, it indicates that the oxygen supply is insufficient and the air supply ratio needs to be appropriately increased to improve the combustion conditions.

[0063] By acquiring and analyzing the combustion state parameters in the above manner, the deviation value and change rate of each key parameter are determined, providing accurate data support for the subsequent distribution coefficient correction, thereby achieving precise control of the boiler combustion state.

[0064] In some embodiments, the initial distribution coefficient of each layer of burners is corrected according to the deviation value, the change rate and the preset weight ratio, including:

[0065] Assigning preset weight ratios to the load deviation value, the main steam temperature deviation value, the rate of change of the main steam temperature, the oxygen content deviation value and the rate of change of the oxygen content respectively;

[0066] The correction amount of each initial allocation coefficient is calculated according to the weight ratio, and the initial allocation coefficient is superimposed with the corresponding correction amount to obtain a corrected allocation coefficient, wherein the corrected allocation coefficient satisfies the preset constraint condition.

[0067] Specifically, the combustion state parameters are first obtained, including the load deviation value ΔFT, the main steam temperature deviation value ΔTE, and the main steam temperature change rate SV TE , oxygen content deviation value ΔB02 and oxygen content change rate SV O2 The deviation values ​​and change rates of these parameters reflect the difference between the current combustion state of the boiler and the target operating state.

[0068] Furthermore, a preset weight ratio is assigned to each of the above combustion state parameters. According to historical operation data and experience, the weight ratio can be set as follows: load deviation ΔFT accounts for 30%, main steam temperature deviation ΔTE accounts for 30%, main steam temperature change rate SV accounts for 30%, and main steam temperature change rate SV accounts for 30%. TE Oxygen content deviation ΔB02 accounts for 20%, oxygen content change rate SV accounts for 10%, O2 These weight ratios reflect the influence of different parameters on the stability of boiler operation.

[0069] Furthermore, the initial distribution coefficient correction of each layer of burners is calculated according to the weight ratio. The correction is obtained by comprehensively considering the deviation value and change rate of all parameters. For example: when the load deviation is large, the distribution coefficient of the upper layer burner is increased first, while the distribution coefficient of the middle and lower layer burners is reduced; when the main steam temperature deviation is large and the change rate is fast, the distribution coefficient is further adjusted to ensure that the combustion process can respond quickly to temperature changes.

[0070] For example, in an example scenario, assume that the initial distribution coefficients of the upper, middle, and lower burners of the boiler are K1, K2, and K3, respectively, and the adjustment range of the correction coefficient is 0.2. When the correction amount KX1 of the distribution coefficient of the upper burner is increased, the distribution coefficients KX2 and KX3 of the middle and lower burners need to be reduced accordingly. The specific correction process follows the following principles: the sum of the increased correction amounts is equal to the sum of the reduced correction amounts, and the sum of the distribution coefficients before and after the correction is kept at 1. The reduction in the middle and lower layers is distributed according to the proportion of the initial distribution coefficient. For example, if the initial distribution coefficient is higher, it will bear a larger reduction.

[0071] For example, taking the boiler with three layers of burners, upper, middle and lower, and the correction coefficient range of 0.2 as an example, the concept of the above correction range is to increase the initial coefficient K1 of the upper burner, and it is necessary to reduce the initial coefficients K2 and K3 of the middle and lower burners accordingly. The corresponding correction ratio is KX1, KX2, KX3, KX1 = KX2 + KX3 = 0.2.

[0072] During the correction process, the correction amplitude needs to be adjusted dynamically. If the combustion state parameters are relatively stable, the correction amplitude will be reduced accordingly to maintain the relative stability of the initial distribution coefficient; when the load deviation and temperature deviation are large, the correction amplitude can be dynamically increased to ensure a quick response to operating requirements.

[0073] For example, in some examples, there is a principle when calculating the correction coefficient to ensure that the negative pressure, oxygen content, and main steam temperature are relatively stable. When the parameters are stable, the correction coefficient range is reduced accordingly, basically responding to load changes based on the initial coefficient. When the load deviation and temperature deviation are large, the upper burner coefficient ZK is positively corrected (increased), and the middle and lower coefficients are negatively corrected accordingly. The distribution ratio of the middle and lower corrections is distributed according to the negative total proportion of the initial coefficient proportion. KX1 = ZK, KX2 = -K2 / (K2+K3)*ZK, KX3 = -K3 / (K2+K3)*ZK, and the value of ZK changes dynamically according to the load deviation and temperature deviation range, and a value between 0 and 0.2 can be preset.

[0074] Finally, the corrected distribution coefficient is calculated by superimposing the initial distribution coefficient and the correction amount. For example, the final distribution coefficient of the upper burner is KZ1 = K1 + KX1, and the distribution coefficients of the middle and lower burners are KZ2 = K2 + KX2 and KZ3 = K3 + KX3, respectively.

[0075] Through the correction process of the above embodiment, dynamic adjustment of fuel distribution can be achieved to ensure relative stability of negative pressure, oxygen content and main steam temperature, while quickly responding to changes in load demand, significantly improving the efficiency and stability of boiler combustion.

[0076] In some embodiments, determining the opening increment of the fuel valve corresponding to each layer of burners according to the fuel quantity includes:

[0077] According to the amount of fuel allocated to each layer of burners, the difference between the current fuel amount and the fuel amount at the previous moment is calculated to obtain the fuel amount change. According to the fuel amount change and the preset proportional relationship, the opening increment of the fuel valve corresponding to each layer of burners is determined.

[0078] Specifically, first, the total amount of gas required for the current load is calculated in conjunction with the upper-level boiler master control system. The boiler master control system will output the total amount of fuel required for the current burner based on the load demand, external working conditions (such as steam pressure, temperature) and real-time combustion status. For example, when the load increases, the total amount of gas calculated by the master control system will increase accordingly, and vice versa.

[0079] Furthermore, the calculated total amount of gas is distributed to the burners on each layer according to the modified distribution coefficient. For example, if the distribution coefficients are K1, K2, and K3, the amount of fuel that the burners on each layer should receive is the K1, K2, and K3 parts of the total fuel amount, respectively. In this way, it is ensured that the amount of fuel received by the burners on each layer matches the distribution coefficient.

[0080] Furthermore, the difference between the current fuel quantity and the previous fuel quantity is calculated to obtain the change in fuel quantity. The change in fuel quantity reflects the amount of fuel supply that needs to be adjusted due to changes in load demand or operating status. For example, when the load suddenly increases, the change in fuel quantity is usually positive, indicating that the fuel supply needs to be increased; when the load decreases, the change is negative.

[0081] Furthermore, the fuel valve opening increment corresponding to each layer of burners is calculated based on the change in fuel quantity and the preset proportional relationship. The proportional relationship defines the correspondence between the change in fuel quantity and the change in valve opening, which is usually determined based on historical data and operating experience. For example, for a burner with a specific pipe diameter, each unit change in fuel quantity corresponds to a specific change in valve opening.

[0082] When allocating the fuel valve opening increment to each layer of burners, it is necessary to ensure the coordination of the adjustment. Taking the three-layer burner as an example, if the change in the total fuel amount requires an increase in the fuel valve opening of the upper layer burner, the fuel valve opening of the middle and lower layers must also be adjusted synchronously according to the allocation ratio to achieve global balance.

[0083] Furthermore, according to the calculated fuel valve opening increment, an adjustment instruction is sent to the fuel valve control system of each layer of burners. For example, the specific increment of the fuel valve opening of the upper layer burner is increased or decreased; and the corresponding adjustment of the fuel valve opening of the middle and lower layer burners.

[0084] The process of adjusting the fuel valve opening is dynamic and needs to be linked with the boiler main control system. Especially when the load changes rapidly, the system needs to monitor the fuel distribution status and the fuel valve opening adjustment effect in real time to ensure that the fuel supply of each layer of burners is consistent with the distribution demand.

[0085] In the aforementioned embodiment, the fuel quantity change refers to the difference between the current fuel quantity and the fuel quantity at the previous moment, and is used to guide the dynamic adjustment of the fuel supply.

[0086] The fuel valve opening increment refers to the opening adjustment amount of the fuel valve within a certain time interval, which is used to achieve precise control of the fuel amount.

[0087] The distribution coefficient is used to define the distribution ratio of the total fuel amount among the burners on each layer, and is adjusted in real time by the boiler main control system according to the operating parameters.

[0088] Linkage control refers to the synchronous adjustment of multiple burner fuel valves to ensure the coordination and stability of the overall combustion system.

[0089] Through the method of the present embodiment, the adjustment of the fuel valve opening can accurately reflect the fuel distribution requirements and improve the operating efficiency of the burner. At the same time, the linkage and dynamic response capabilities of the fuel valve opening adjustment effectively ensure the combustion stability and fuel utilization rate when the boiler load changes, thereby optimizing the overall performance of the boiler.

[0090] In some embodiments, after adjusting the opening of the fuel valves of the burners at each layer, the method further includes:

[0091] According to the opening of the adjusted fuel valve and the mapping relationship between the preset opening range of the fuel valve and the opening of the air distribution valve, the opening of the air distribution valve is automatically adjusted, and the opening offset of the air distribution valve is set, wherein the opening offset is used to correct the opening of the air distribution valve after automatic adjustment.

[0092] Specifically, this embodiment also discloses a specific process of automatically adjusting the opening of the air distribution valve based on the opening of the fuel valve after adjusting the opening of the fuel valve of each layer of burners. This process ensures that the ratio of fuel to air is dynamically matched, thereby optimizing combustion efficiency and ensuring combustion stability.

[0093] First, after the fuel valve adjusts its opening according to the distribution instruction, the air distribution valve automatically adjusts its opening to achieve dynamic matching of fuel and air. The opening of the fuel valve is a direct reflection of the fuel flow rate, and the opening of the air distribution valve determines the amount of air entering the burner. The linkage adjustment of the two is achieved through a preset mapping relationship.

[0094] The mapping relationship is pre-set according to the boiler operation characteristics and the burner design characteristics. For example, for a certain range of fuel valve openings, each fuel valve opening corresponds to a specific air distribution valve opening interval to ensure that the oxygen supply during the combustion process is appropriate. For example:

[0095] When the fuel valve opening is small, the corresponding air distribution valve opening is also small to avoid excessive air causing a decrease in combustion efficiency;

[0096] When the fuel valve opening increases, the air distribution valve opening increases accordingly to provide sufficient oxygen to support complete combustion.

[0097] Furthermore, when the fuel valve is adjusted, the opening of the air distribution valve is dynamically calculated according to the latest opening value of the fuel valve and the mapping relationship, and a corresponding adjustment instruction is issued.

[0098] The opening of the air distribution valve changes in proportion to the opening of the fuel valve. For example, when the fuel valve opening changes beyond a certain threshold, the air distribution valve will be adjusted synchronously to ensure that the air supply responds to the fuel change in a timely manner;

[0099] During the automatic adjustment process, the movement range of the air distribution valve is limited to the preset range to avoid over-adjustment or under-adjustment problems.

[0100] Furthermore, in order to further optimize the air supply, the air distribution valve has added the function of opening offset on the basis of automatic adjustment. The opening offset is a kind of fine-tuning amount set manually, which is used to make fine corrections to the opening of the air distribution valve on the basis of automatic adjustment. For example:

[0101] Under certain special operating conditions (such as low load), it may be necessary to increase the bias to provide additional air to ensure complete combustion; conversely, under high load, it may be necessary to reduce the bias to avoid energy loss caused by excess air.

[0102] In some examples, the setting of the opening bias can be completed by manual operation. For example, the operator dynamically adjusts the bias according to the actual monitored combustion state parameters (such as oxygen deviation) to meet the combustion requirements under specific working conditions.

[0103] In the aforementioned embodiment, the mapping relationship refers to the corresponding relationship between the fuel valve opening and the air distribution valve opening, which is usually set through experimental data or operating experience to ensure a reasonable match between fuel and air.

[0104] Follow-up automatic means that the movement of the air valve follows the movement changes of the fuel valve in real time, and automatically completes the opening adjustment.

[0105] The opening offset is used to manually correct the opening of the air distribution valve after automatic adjustment, and is usually set dynamically according to specific operating requirements.

[0106] Through the above steps, the air distribution valve of the burner can achieve precise follow-up control of the fuel valve, while allowing manual adjustment through the offset, thus achieving a balance between automatic control and flexibility. This method significantly improves the combustion efficiency, ensures that the burner can operate stably under different working conditions, and optimizes the utilization efficiency of fuel and air.

[0107] According to the technical solution provided in the embodiment of the present application, the present application presets the opening distribution coefficient of the combustion hot fuel valve according to the initial diameter of the pipeline. The corresponding load deviation, temperature deviation, temperature change rate, oxygen content change rate, and oxygen content deviation calculation correction coefficient are calculated, and the load change can be quickly responded to on the basis of ensuring stable combustion. The technical solution of the present application has at least the following advantages:

[0108] 1) Improve stability

[0109] This solution fully considers the stability of multiple key parameters such as load, main steam temperature, oxygen content, etc. during the burner control process. Through dynamic monitoring and real-time correction of deviation values ​​and change rates, it ensures that the core parameters in the combustion process remain stable. In addition, when the system operating status changes, it can quickly respond and automatically adjust the fuel distribution and valve opening of each layer of burners, effectively avoiding the problem of unstable combustion caused by improper operation or parameter fluctuations.

[0110] 2) Improve comprehensiveness

[0111] This solution incorporates the impact of physical property differences in boiler process design into the control logic by introducing the physical properties of branch gas pipeline diameters and the distribution principle of fuel input. At the same time, the solution comprehensively considers the deviation range and change rate of parameters and assigns different weights to ensure that the control strategy is more comprehensive and accurate. This multi-dimensional optimization strategy not only overcomes the defects of the existing technology that ignores the differences in burner levels and pipelines, but also can better adapt to complex working conditions.

[0112] 3) Achieve energy-saving optimization

[0113] By dynamically adjusting the fuel distribution coefficient of each layer of burners and linking the opening control of the fuel valve and the air distribution valve, this solution optimizes the fuel-air ratio to the maximum while ensuring combustion efficiency. The precise matching of fuel and oxygen based on combustion characteristics reduces energy waste during the combustion process, thereby significantly improving the combustion efficiency and overall operating economy of the boiler. This energy-saving effect is particularly prominent under high load and complex working conditions.

[0114] Therefore, in summary, the technical solution of the present application solves the technical problems in the prior art such as high labor intensity of manual adjustment, insufficient automatic control and difficulty in improving combustion efficiency through coordinated optimization of the three dimensions of stability, comprehensiveness and energy saving, and provides reliable technical guarantee for the intelligent coordinated control of boiler burners.

[0115] The following are device embodiments of the present application, which can be used to execute the method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

[0116] Figure 2 Schematic diagram of the structure of the boiler burner coordinated control device provided in the embodiment of the present application. Figure 2 As shown, the boiler burner coordinated control device includes:

[0117] The first determination module 201 is configured to determine the initial allocation coefficient of each layer of burners according to the physical parameters of the branch gas pipelines corresponding to each layer of burners in the boiler;

[0118] The correction module 202 is configured to obtain the combustion state parameters during the operation of the boiler and correct the initial distribution coefficients of the burners at each layer according to the combustion state parameters;

[0119] The second determination module 203 is configured to determine the amount of fuel corresponding to each layer of burners according to the total amount of fuel required for the current load determined by the boiler master control and the corrected distribution coefficient;

[0120] The distribution module 204 is configured to distribute the fuel amount to the burners of each layer, and determine the opening increment of the fuel valve corresponding to the burners of each layer according to the fuel amount;

[0121] The regulating module 205 is configured to regulate the opening of the fuel valve of each layer of burners according to the opening increment, so that the fuel supply amount of each layer of burners matches the fuel amount allocated to each layer of burners.

[0122] In some embodiments, Figure 2 The first determination module 201 determines the maximum flow rate of each branch gas pipeline connected to each layer of burners in the boiler according to its diameter; according to the maximum flow rate of each branch gas pipeline and the principle that the fuel input amount of each layer of burners is basically the same, the initial distribution coefficient of each layer of burners is calculated, wherein the initial distribution coefficient meets the preset constraints.

[0123] In some embodiments, Figure 2 The correction module 202 determines the deviation value and the change rate corresponding to the preset key parameters according to the combustion state parameters, and corrects the initial distribution coefficient of each layer of burners according to the deviation value, the change rate and the preset weight ratio.

[0124] In some embodiments, Figure 2 The correction module 202 obtains key parameters in the combustion state parameters, wherein the key parameters include load, main steam temperature and oxygen content; and respectively determines the load deviation value between the target value and the actual value of the load, the main steam temperature deviation value between the target value and the actual value of the main steam temperature, the change rate of the main steam temperature, the oxygen content deviation value between the target value and the actual value of the oxygen content, and the change rate of the oxygen content.

[0125] In some embodiments, Figure 2 The correction module 202 assigns preset weight ratios to the load deviation value, the main steam temperature deviation value, the rate of change of the main steam temperature, the oxygen content deviation value and the rate of change of the oxygen content; calculates the correction amount of each initial distribution coefficient according to the weight ratio, superimposes the initial distribution coefficient with the corresponding correction amount, and obtains the corrected distribution coefficient, wherein the corrected distribution coefficient satisfies the preset constraint conditions.

[0126] In some embodiments, Figure 2 The distribution module 204 calculates the difference between the current fuel amount and the fuel amount at the previous moment according to the fuel amount distributed to each layer of burners, obtains the fuel amount change, and determines the opening increment of the fuel valve corresponding to each layer of burners according to the fuel amount change and the preset proportional relationship.

[0127] In some embodiments, Figure 2 After adjusting the opening of the fuel valve of each layer of burners, the regulating module 205 automatically adjusts the opening of the air distribution valve according to the adjusted opening of the fuel valve and the mapping relationship between the preset opening range of the fuel valve and the opening of the air distribution valve, and sets the opening offset of the air distribution valve, wherein the opening offset is used to correct the opening of the air distribution valve after the automatic adjustment.

[0128] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0129] Figure 3 Schematic diagram of an electronic device 3 provided in an embodiment of the present application. Figure 3 As shown, the electronic device 3 of this embodiment includes: a processor 301, a memory 302, and a computer program 303 stored in the memory 302 and executable on the processor 301. When the processor 301 executes the computer program 303, the steps in the above-mentioned method embodiments are implemented. Alternatively, when the processor 301 executes the computer program 303, the functions of the modules / units in the above-mentioned device embodiments are implemented.

[0130] The electronic device 3 may be a desktop computer, a notebook, a PDA, a cloud server, or other electronic device. The electronic device 3 may include, but is not limited to, a processor 301 and a memory 302. Those skilled in the art will appreciate that Figure 3 The electronic device 3 is merely an example and does not limit the electronic device 3 , and may include more or less components than those shown in the figure, or different components.

[0131] The processor 301 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0132] The memory 302 may be an internal storage unit of the electronic device 3, for example, a hard disk or memory of the electronic device 3. The memory 302 may also be an external storage device of the electronic device 3, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 3. The memory 302 may also include both an internal storage unit of the electronic device 3 and an external storage device. The memory 302 is used to store computer programs and other programs and data required by the electronic device.

[0133] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units.

[0134] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium (e.g., a computer-readable storage medium). Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. The computer program may include computer program code, which may be in source code form, object code form, executable file or some intermediate form. Computer-readable storage media may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0135] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A boiler burner coordinated control method, characterized in that: include: According to the physical parameters of the branch gas pipelines corresponding to the burners at each layer in the boiler, the initial distribution coefficients of the burners at each layer are determined; Obtaining combustion state parameters during boiler operation, and correcting initial distribution coefficients of burners at each layer according to the combustion state parameters; According to the total amount of fuel required for the current load determined by the boiler master control and the corrected distribution coefficient, the corresponding amount of fuel for each layer of burners is determined; Distributing the fuel amount to the burners on each layer, and determining the opening increment of the fuel valve corresponding to the burners on each layer according to the fuel amount; According to the opening increment, the opening of the fuel valve of each layer of burners is adjusted so that the fuel supply amount of each layer of burners matches the fuel amount allocated to each layer of burners.

2. The method according to claim 1, characterized in that: The initial distribution coefficient of each layer of burners is determined according to the physical parameters of the branch gas pipelines corresponding to each layer of burners in the boiler, including: According to the diameter of the branch gas pipelines connected to the burners on each layer in the boiler, determine the maximum flow rate of each branch gas pipeline; According to the maximum flow rate of each branch gas pipeline and the principle that the fuel input amount of each layer of burners is basically the same, the initial distribution coefficient of each layer of burners is calculated, wherein the initial distribution coefficient meets the preset constraint conditions.

3. The method according to claim 1, characterized in that The method of correcting the initial distribution coefficient of each layer of burners according to the combustion state parameter comprises: According to the combustion state parameters, the deviation value and the change rate corresponding to the preset key parameters are determined, and according to the deviation value, the change rate and the preset weight ratio, the initial distribution coefficient of each layer of burners is corrected.

4. The method according to claim 3, characterized in that Determining the deviation value and the change rate corresponding to the preset key parameter according to the combustion state parameter includes: Acquiring key parameters of the combustion state parameters, wherein the key parameters include load, main steam temperature and oxygen content; The load deviation value between the target value and the actual value of the load, the main steam temperature deviation value between the target value and the actual value of the main steam temperature, the change rate of the main steam temperature, the oxygen amount deviation value between the target value and the actual value of the oxygen amount, and the change rate of the oxygen amount are determined respectively.

5. The method according to claim 4, characterized in that The initial distribution coefficient of each layer of burners is corrected according to the deviation value, the change rate and the preset weight ratio, including: Assigning preset weight ratios to the load deviation value, the main steam temperature deviation value, the rate of change of the main steam temperature, the oxygen content deviation value, and the rate of change of the oxygen content, respectively; The correction amount of each initial allocation coefficient is calculated according to the weight ratio, and the initial allocation coefficient is superimposed with the corresponding correction amount to obtain the corrected allocation coefficient, wherein the corrected allocation coefficient satisfies the preset constraint condition.

6. The method according to claim 1, characterized in that Determining the opening increment of the fuel valve corresponding to each layer of burners according to the fuel amount includes: According to the amount of fuel allocated to each layer of burners, the difference between the current fuel amount and the fuel amount at the previous moment is calculated to obtain the fuel amount change. According to the fuel amount change and the preset proportional relationship, the opening increment of the fuel valve corresponding to each layer of burners is determined.

7. The method according to claim 1, characterized in that After adjusting the opening of the fuel valve of each layer of burners, the method further includes: According to the opening of the adjusted fuel valve and the mapping relationship between the preset opening range of the fuel valve and the opening of the air distribution valve, the opening of the air distribution valve is automatically adjusted, and the opening offset of the air distribution valve is set, wherein the opening offset is used to correct the opening of the automatically adjusted air distribution valve.

8. A boiler burner coordinated control device, characterized in that: include: The first determination module is configured to determine the initial allocation coefficient of each layer of burners according to the physical parameters of the branch gas pipelines corresponding to each layer of burners in the boiler; A correction module is configured to obtain combustion state parameters during the operation of the boiler and correct the initial distribution coefficients of the burners at each layer according to the combustion state parameters; The second determination module is configured to determine the amount of fuel corresponding to each layer of burners according to the total amount of fuel required for the current load determined by the boiler master control and the corrected distribution coefficient; a distribution module configured to distribute the fuel amount to the burners at each layer, and determine the opening increment of the fuel valve corresponding to the burners at each layer according to the fuel amount; The regulating module is configured to regulate the opening of the fuel valve of each layer of burners according to the opening increment so that the fuel supply amount of each layer of burners matches the fuel amount allocated to each layer of burners.

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

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

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