Isobaric secondary air system used for 660MW oversized CFB boiler and capable of being adjusted in partition mode

Abstract

The invention relates to the technical field of boiler combustion control, in particular to an isobaric secondary air system capable of being adjusted in a partitioned mode and used for a 660MW oversized CFB boiler. In order to solve the problems that in the prior art, the ultra-large single-hearth combustion requirement cannot be met, the structural design of an air bellow is unreasonable, and the adjusting mode is single, the technical scheme is provided that the system comprises a primary air mother pipe used for providing primary air; the secondary air distribution pipe is used for conveying the primary air to the secondary air box; the trapezoidal upper-layer and lower-layer isobaric secondary bellows are respectively arranged on the front wall and the rear wall of the hearth and are used for uniformly distributing static pressure; the upper-layer secondary air branch pipe and the lower-layer secondary air branch pipe are respectively connected to the corresponding air boxes and are used for conveying secondary air to the hearth; and the throttling air rings are arranged at the tail ends of the branch pipes and used for adjusting the air volume flow of the branch pipes to ensure that the air volumes of the branch pipes in the air bellow are consistent. According to the system, partition adjustment and uniform air distribution are achieved, and the system is suitable for combustion optimization and pollutant emission reduction of the 660MW ultra-large-capacity CFB boiler.

Description

Technical Field

[0001] The invention relates to the technical field of boiler combustion control, and in particular to an isobaric secondary air system which can be adjusted in zones for a 660MW super-large CFB boiler. Background Art

[0002] Circulating fluidized bed CFB boiler is a high-efficiency, low-pollution coal-fired boiler technology, which has important application value in the field of energy conservation and emission reduction. Traditional small and medium-sized CFB boilers usually adopt a single rectangular secondary air box design due to the small size of the furnace. All secondary air branches are directly connected to one wind box, and the air volume is adjusted by the damper set on the secondary air branch. This design can meet the basic combustion needs in small and medium-sized CFB boilers, but with the expansion of boiler scale and the application of supercritical and ultra-supercritical technologies, its limitations are gradually emerging.

[0003] Taking a 300MW medium-sized CFB boiler as an example, the role of the secondary air system in combustion adjustment is mainly achieved by adjusting the air volume of each branch pipe through the damper. However, due to the short length of the secondary air box and the small wind pressure difference between the branches, although the damper adjustment can achieve a certain air volume distribution, the air volume control accuracy is low. In addition, the secondary air system cannot achieve precise adjustment of the air volume in a local area, which may cause uneven combustion under different combustion conditions, affecting the combustion efficiency and pollutant emission level of the boiler.

[0004] In recent years, as CFB boilers have developed to 660MW-class ultra-supercritical technology, the width and depth of large single-furnace boilers have increased significantly, and the traditional secondary air system design has been difficult to adapt to new needs. On the one hand, the length of the rectangular wind box in the width direction of the furnace has increased significantly, resulting in uneven distribution of wind pressure at the branch pipe inlet. In order to overcome the difference in wind pressure distribution, it is usually necessary to increase the resistance of the branch pipe damper, but this will significantly increase the energy consumption and difficulty of adjustment of the system. On the other hand, due to the significant differences in the combustion state of different areas of the furnace, the traditional secondary air system cannot meet the needs of regional adjustment, which limits the improvement of boiler combustion performance.

[0005] For example, the single rectangular air box design used in the existing secondary air system is prone to the following problems in actual operation:

[0006] Uneven distribution of wind pressure: The rectangular bellows is relatively long, and the wind pressure at the far end branch is significantly lower than that at the near end branch, which affects the uniformity of combustion.

[0007] Difficulty in adjusting air volume: There is a large resistance loss when adjusting air volume through the damper, and it is impossible to accurately control the air volume distribution, which is more obvious in large-capacity boilers.

[0008] Insufficient energy-saving effect: The damper adjustment method increases the system resistance loss, causing the fan energy consumption to increase, which is not conducive to the realization of energy-saving goals.

[0009] Therefore, the secondary air system in the prior art has significant deficiencies when facing ultra-large capacity CFB boilers: it cannot meet the needs of zone regulation, uneven wind pressure distribution leads to reduced combustion efficiency, and damper adjustment increases system energy consumption, which is not conducive to the flexibility and energy saving of boiler operation.

[0010] In summary, the deficiencies in the prior art are mainly manifested as follows:

[0011] Lack of precise control of air volume in local areas of the furnace, unable to meet the combustion requirements of a single large furnace;

[0012] The unreasonable design of the wind box structure leads to significant differences in the wind pressure distribution at the branch pipe inlet and poor combustion uniformity;

[0013] The adjustment method is single and the damper resistance is too large, which increases system energy consumption and reduces operating efficiency. Summary of the invention

[0014] In order to solve the technical problems existing in the prior art, that the prior art cannot meet the combustion requirements of a super-large single furnace, and that the wind box structure design is unreasonable and the adjustment method is single, the technical solution provided by the present invention is:

[0015] A zone-adjustable isobaric secondary air system for a 660MW super-large CFB boiler, comprising:

[0016] Primary air main pipe, used to provide primary air;

[0017] A secondary air distribution pipe connected to the primary air main pipe and used to transport the primary air to the secondary air box;

[0018] The upper isobaric secondary wind box and the lower isobaric secondary wind box are respectively arranged on the front wall and the rear wall of the furnace, each secondary wind box is a trapezoidal isobaric wind box, connected to the primary air main pipe through the secondary air distribution pipe, and used to evenly distribute the static pressure entering the secondary wind box;

[0019] The upper secondary air branch pipe and the lower secondary air branch pipe are connected to the upper isobaric secondary air box and the lower isobaric secondary air box respectively, and are used to transport the secondary air to the furnace;

[0020] The throttling air ring is arranged at the ends of the upper secondary air branch pipe and the lower secondary air branch pipe, and is used to adjust the air volume flow of the secondary air branch pipe so that the air volume of each branch pipe in the same secondary air box is consistent.

[0021] Furthermore, a preferred embodiment is provided, which also includes a secondary air distribution damper, which is arranged on the secondary air distribution pipe and is used to adjust the air volume entering the secondary air box.

[0022] Further, a preferred embodiment is provided, wherein the secondary air boxes are distributed such that four secondary air boxes are respectively arranged on the front wall and the rear wall of the furnace;

[0023] Furthermore, a preferred embodiment is provided, wherein the secondary air boxes are arranged in two layers, upper and lower layers, each secondary air box is connected to the primary air mother pipe via a separate secondary air distribution pipe, and zone regulation is achieved via the secondary air distribution damper.

[0024] Furthermore, a preferred embodiment is provided, wherein the trapezoidal isobaric secondary air box realizes uniform distribution of static pressure inside the secondary air box, and the throttling air ring realizes consistent air volume flow of the secondary air branch pipe by adjusting the size.

[0025] Based on the same inventive concept, the present invention also provides a 660MW super-large CFB boiler, which includes the isobaric secondary air system.

[0026] Based on the same inventive concept, the present invention also provides a control method for a zone-adjustable isobaric secondary air system for a 660MW super-large CFB boiler. The method is implemented based on the system and includes the following steps:

[0027] The steps of obtaining boiler operating parameters, including furnace temperature distribution, pressure distribution and fuel characteristics;

[0028] Steps for collecting secondary air box air volume, static pressure and secondary air branch pipe flow data;

[0029] Control the opening of the secondary air distribution damper, adjust the air volume entering the secondary air box, and adjust the air volume distribution steps according to the combustion conditions;

[0030] Steps for optimizing zone air volume and branch flow control based on real-time feedback of combustion status.

[0031] Based on the same inventive concept, the present invention also provides a computer storage medium for storing a computer program. When the computer program is read by a computer, the computer executes the described method.

[0032] Based on the same inventive concept, the present invention also provides a computer, including a processor and a storage medium. When the processor reads a computer program stored in the storage medium, the computer executes the method described.

[0033] Based on the same inventive concept, the present invention also provides a computer program product, which is a computer program. When the computer program is executed, the method described above is implemented.

[0034] Compared with the prior art, the technical solution provided by the present invention is beneficial in that:

[0035] The design of the trapezoidal isobaric wind box effectively balances the static pressure distribution inside the secondary wind box, ensuring that the static pressure at the inlet of each branch pipe connected to the same wind box is consistent. Compared with the traditional rectangular wind box, the trapezoidal isobaric wind box can better meet the wind pressure uniformity requirements of a single furnace with a large width, significantly improve the air volume uniformity in the combustion area, and avoid the problem of uneven combustion caused by uneven static pressure distribution.

[0036] A throttling air ring is set at the end of the secondary air branch pipe, and the air volume of each branch pipe can be accurately controlled by fine-tuning the size of the throttling air ring. Compared with the traditional method of adjusting the air volume by the damper, the throttling air ring reduces the resistance loss during the adjustment process, improves the accuracy of air volume adjustment, and reduces the energy consumption of the system, further optimizing the energy-saving performance of the boiler.

[0037] The unitized layout design of the secondary air boxes realizes the independent zoning control of the secondary air boxes on the upper and lower floors and the front and rear walls. Compared with the overall air volume adjustment mode of the traditional secondary air system, this zoning adjustment method can flexibly respond to different combustion conditions. By accurately controlling the air volume in each area, it significantly improves the combustion efficiency and reduces pollutant emissions.

[0038] The secondary air distribution pipe and the main pipe are designed to be connected separately, and the air volume entering each secondary air box is controlled by setting a distribution damper. This design not only reduces the complexity of the main pipe, but also avoids the problem of unstable regulation caused by wind pressure crosstalk between air boxes, making the system more flexible and stable under dynamic combustion conditions.

[0039] Through zoning regulation and uniform air distribution design, the system significantly reduces the loss of boiler thermal efficiency caused by uneven air volume distribution. Compared with the prior art method of regulating the air volume of the secondary air branch pipe by relying on the damper, this solution reduces the fan power consumption caused by increased resistance, thereby further reducing the overall energy consumption of boiler operation and enhancing the economy of the system.

[0040] It can be applied to the secondary air zoning regulation and combustion optimization of 660MW ultra-large capacity CFB boilers. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a front view of a zone-adjustable isobaric secondary air system for a 660MW super-large CFB boiler;

[0042] Figure 2 A top view of a zone-adjustable isobaric secondary air system for a 660MW super-large CFB boiler;

[0043] Figure 3 A side view of a zone-adjustable isobaric secondary air system for a 660MW super-large CFB boiler;

[0044] Among them, 1 is the primary air main pipe, 2 is the secondary distribution pipe, 3 is the secondary air distribution damper, 4 is the upper isobaric secondary air box, 5 is the lower isobaric secondary air box, 6 is the upper secondary air branch pipe, 7 is the lower secondary air branch pipe, and 8 is the throttling air ring. DETAILED DESCRIPTION

[0045] In order to make the advantages and benefits of the technical solution provided by the present invention more clearly reflected, the technical solution provided by the present invention is now further described in detail with reference to the accompanying drawings, specifically:

[0046] Implementation Method 1: Combination Figure 1-3 This embodiment is described. This embodiment provides a zone-adjustable isobaric secondary air system for a 660MW super-large CFB boiler, including:

[0047] Primary air main pipe 1, used to provide primary air;

[0048] A secondary air distribution pipe, connected to the primary air main pipe 1, for conveying the primary air to the secondary air box;

[0049] The upper isobaric secondary wind box 4 and the lower isobaric secondary wind box 5 are respectively arranged on the front wall and the rear wall of the furnace, each secondary wind box is a trapezoidal isobaric wind box, connected to the primary air main pipe 1 through the secondary air distribution pipe, and used to evenly distribute the static pressure entering the secondary wind box;

[0050] The upper secondary air branch pipe 6 and the lower secondary air branch pipe 7 are connected to the upper isobaric secondary air box 4 and the lower isobaric secondary air box 5, respectively, for conveying the secondary air to the furnace;

[0051] The throttling air ring 8 is arranged at the ends of the upper secondary air branch pipe 6 and the lower secondary air branch pipe 7, and is used to adjust the air volume flow of the secondary air branch pipes so that the air volume of each branch pipe in the same secondary air box is consistent.

[0052] Embodiment 2. This embodiment is a further limitation of the zone-adjustable isobaric secondary air system for a 660MW super-large CFB boiler provided in Embodiment 1, and also includes a secondary air distribution damper 3, which is arranged on the secondary air distribution pipe and is used to adjust the air volume entering the secondary air box.

[0053] Embodiment 3: This embodiment further defines the isobaric secondary air system for a 660MW super-large CFB boiler that can be adjusted in different zones provided in Embodiment 2, wherein the secondary air boxes are distributed in such a way that four secondary air boxes are respectively arranged on the front wall and the rear wall of the furnace;

[0054] Embodiment 4. This embodiment is a further limitation of the isobaric secondary air system with zone-adjustable control for a 660MW super-large CFB boiler provided in Embodiment 3. The secondary air box is arranged in two layers, upper and lower. Each secondary air box is connected to the primary air mother pipe 1 through a separate secondary air distribution pipe, and zone adjustment is achieved through the secondary air distribution damper 3.

[0055] Implementation method five. This implementation method is a further limitation of the zone-adjustable isobaric secondary air system for a 660MW super-large CFB boiler provided in implementation method four. The trapezoidal isobaric secondary air box realizes uniform distribution of static pressure inside the secondary air box, and the throttling air ring 8 realizes consistent air volume flow of the secondary air branch pipe by adjusting the size.

[0056] Embodiment 6: This embodiment provides a 660MW super-large CFB boiler, which includes the isobaric secondary air system provided in Embodiment 1.

[0057] Embodiment 7: This embodiment provides a control method for a zone-adjustable isobaric secondary air system for a 660MW super-large CFB boiler. The method is implemented based on the system provided in Embodiment 1 and includes the following steps:

[0058] The steps of obtaining boiler operating parameters, including furnace temperature distribution, pressure distribution and fuel characteristics;

[0059] Steps for collecting secondary air box air volume, static pressure and secondary air branch pipe flow data;

[0060] Control the opening of the secondary air distribution damper 3, adjust the air volume entering the secondary air box, and adjust the air volume distribution steps according to the combustion conditions;

[0061] Steps for optimizing zone air volume and branch flow control based on real-time feedback of combustion status.

[0062] Specifically, they include:

[0063] 1. Obtain basic parameters of boiler operation

[0064] The basic parameters of boiler operation are obtained through the control system, including:

[0065] Temperature distribution in the furnace area: Temperature sensors installed in various areas of the furnace are used to collect data in real time to ensure accurate monitoring of the combustion status.

[0066] Pressure distribution: The pressure data of different areas in the furnace are collected through pressure sensors to determine the airflow distribution status.

[0067] Fuel characteristics: Combined with the data collected by coal quality testing equipment, including the volatile matter, ash content and particle distribution of the fuel, it serves as a reference for zone air volume adjustment.

[0068] 2. Determine the target air volume distribution value for zone regulation and the static pressure distribution requirements for uniform air distribution

[0069] According to the furnace operation parameters obtained, the target air volume distribution value for each partition is calculated. The target value is determined based on:

[0070] The demand for burning intensity in different areas;

[0071] Emission requirements must prioritize ensuring a stable air-fuel ratio in high-pollution areas.

[0072] The control system adjusts the air volume through an iterative optimization algorithm to ensure uniform static pressure distribution and meet zoned combustion requirements.

[0073] 3. Use sensors to collect the air volume, static pressure of each secondary air box and the flow data of each secondary air branch pipe

[0074] The flow sensor and static pressure sensor installed on each secondary air box collect real-time data to monitor the actual operating status of each secondary air box.

[0075] The flow sensor is installed at the entrance of the secondary air branch pipe to obtain the branch pipe flow data;

[0076] The static pressure sensor is arranged inside the trapezoidal air box of the secondary air box to monitor the pressure distribution inside the air box.

[0077] 4. Monitor the combustion status in the furnace

[0078] Combustion monitoring equipment is arranged in key areas of the furnace, including:

[0079] Temperature sensor, used to monitor the distribution of combustion temperature;

[0080] Gas analyzers to detect emission concentrations of pollutants such as NOx and SOx;

[0081] Air-fuel ratio sensor, used to monitor the air-fuel ratio of each zone in real time to ensure the stability and sufficiency of combustion.

[0082] 5. Control the opening of the secondary air distribution damper and adjust the air volume entering each secondary air box

[0083] The control system adjusts the opening of the secondary air distribution damper 3 to accurately control the air intake of each secondary air box:

[0084] The opening adjustment is driven by a servo motor and is dynamically adjusted in response to changes in combustion conditions;

[0085] Optimize the opening of the distribution damper to ensure that the air volume entering different secondary air boxes meets the zoning requirements.

[0086] 6. Adjust the air volume distribution of the secondary air boxes on the upper and lower floors and the front and rear walls

[0087] According to the combustion conditions of the front and rear walls and the upper and lower layers of the furnace, the partitioned air volume of the secondary air box is adjusted:

[0088] The secondary air boxes on the front and rear walls are controlled separately to support flexible adjustment of the air volume in the area;

[0089] The air volume distribution between the upper and lower secondary air boxes is dynamically adjusted according to the changes in the heat load of the combustion area.

[0090] 7. Dynamically adjust the size of the throttling air ring to ensure consistent air flow in the branch pipes

[0091] A throttling air ring 8 is provided at the end of each secondary air branch pipe, and the opening of the throttling air ring is dynamically adjusted through the control system to ensure:

[0092] All branch pipes in the same trapezoidal secondary air box have uniform flow;

[0093] Reduce the resistance difference between branch pipes and improve the stability of system operation.

[0094] 8. Automatically correct the partition air volume and branch flow control strategy

[0095] Through real-time feedback of monitoring data, the control strategy of partition air volume and branch pipe flow is automatically corrected:

[0096] When the temperature or pollutant concentration in the combustion area exceeds the preset range, the system adjusts the opening of the secondary air distribution damper 3 and the size of the throttling air ring 8;

[0097] A feedback control algorithm is used to ensure that combustion conditions are always maintained at optimal levels.

[0098] 9. Improve combustion efficiency and reduce pollutant emissions

[0099] Through iterative optimization algorithms, air volume distribution and flow control are dynamically adjusted to achieve the following effects:

[0100] Improve combustion efficiency and reduce incomplete combustion exhaust emissions;

[0101] Reduce pollutant emission concentrations to meet environmental protection requirements.

[0102] 10. Data storage and abnormal alarm

[0103] The control system stores all monitoring data and adjustment parameters in the database:

[0104] The data is used for subsequent analysis and system optimization;

[0105] When the static pressure in the secondary air box or the flow rate in the secondary air branch pipe exceeds the preset range, the system automatically triggers an alarm, reminds the operator through the display interface, and records the abnormal information for subsequent analysis.

[0106] Embodiment 8: This embodiment provides a computer storage medium for storing a computer program. When the computer program is read by a computer, the computer executes the method provided in embodiment 7.

[0107] Embodiment 9: This embodiment provides a computer, including a processor and a storage medium. When the processor reads a computer program stored in the storage medium, the computer executes the method provided in embodiment 7.

[0108] Embodiment 10: This embodiment provides a computer program product, which is a computer program. When the computer program is executed, the method provided in embodiment 7 is implemented.

[0109] Implementation Method XI: Combination Figure 1-3 This embodiment is described. This embodiment further describes the technical solution provided above in detail through specific implementation. Specifically:

[0110] The system includes: a primary air main pipe 1, a secondary air distribution pipe 2, a secondary air distribution damper 3, an upper isobaric secondary air box 4, a lower isobaric secondary air box 5, an upper secondary air branch pipe 6, a lower secondary air branch pipe 7 and a throttling air ring 8.

[0111] The structure is as follows: the primary air main pipe 1 is arranged on both sides of the furnace, supplying air to the secondary air boxes on the front wall and the rear wall respectively. Two primary air main pipes are arranged on each side, connected to each independent secondary air box through a secondary air distribution pipe 2. A secondary air distribution damper 3 is arranged on each secondary air distribution pipe to control the air volume entering the secondary air box.

[0112] Four secondary wind boxes are arranged on the front wall and the rear wall of the furnace, for a total of eight secondary wind boxes. The secondary wind boxes on each side are divided into two layers, the upper layer is the upper isobaric secondary wind box 4, and the lower layer is the lower isobaric secondary wind box 5. Each isobaric wind box adopts a trapezoidal design to ensure uniform distribution of static pressure inside the wind box.

[0113] The upper isobaric secondary air box is connected to the furnace through the upper secondary air branch pipe 6, and the lower isobaric secondary air box is connected to the furnace through the lower secondary air branch pipe 7. A throttling air ring 8 is provided at the end of all secondary air branch pipes to fine-tune the air volume and ensure that the flow rate of each branch pipe is consistent.

[0114] In actual work:

[0115] Secondary air distribution and the process of entering the wind box

[0116] The primary air enters the secondary air distribution pipe 2 through the primary air main pipe 1. The secondary air distribution pipe adjusts the air volume entering each secondary air box through the secondary air distribution damper 3 arranged thereon. By controlling the opening of the damper, the air volume of each secondary air box can be flexibly adjusted individually.

[0117] The air pressure of the secondary air box is evenly distributed

[0118] The secondary air box adopts a trapezoidal isobaric design, which can evenly distribute the static pressure of the secondary air to all branch pipe inlets in each air box. The geometric optimization design of the trapezoidal air box overcomes the problem of uneven air pressure distribution caused by the excessive length of the traditional rectangular air box, ensuring that the static pressure at the inlet of all branch pipes is equal.

[0119] Flow control of secondary air branch pipe

[0120] The upper secondary air box 4 and the lower secondary air box 5 deliver the secondary air to the furnace through the upper secondary air branch pipe 6 and the lower secondary air branch pipe 7 respectively. The throttling air ring 8 arranged at the end of the branch pipe can precisely adjust the air volume flow of each branch pipe by fine-tuning the size of the throttling ring, avoiding the problem of high resistance loss caused by adjusting the branch pipe damper.

[0121] Implementation of partition adjustment

[0122] By arranging the secondary wind boxes in units, the front and rear walls and the upper and lower layers of the furnace can independently control the air volume distribution, forming a zone adjustment capability. According to the combustion requirements, the air volume of the secondary wind boxes can be adjusted according to the combustion conditions in different areas, flexibly responding to complex combustion conditions, and improving combustion efficiency and pollutant control capabilities.

[0123] Energy saving effect

[0124] Through the uniform static pressure design inside the bellows and the precise adjustment of the throttling air ring, the system avoids the high resistance problem of damper adjustment in the traditional secondary air system, reduces the extra energy consumption of the fan, and achieves the goal of energy-saving operation. At the same time, due to the more uniform distribution of air volume, the energy waste caused by uneven combustion is reduced.

[0125] The technical solution provided by the present invention is further described in detail above through several specific implementation modes in order to highlight the advantages and benefits of the technical solution provided by the present invention. However, the several specific implementation modes described above are not intended to be used as limitations on the present invention. Any reasonable modification and improvement of the present invention, combination of implementation modes and equivalent substitution within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A zone-adjustable isobaric secondary air system for a 660MW super-large CFB boiler, characterized in that: include: Primary air main pipe, used to provide primary air; A secondary air distribution pipe connected to the primary air main pipe and used to transport the primary air to the secondary air box; The upper isobaric secondary wind box and the lower isobaric secondary wind box are respectively arranged on the front wall and the rear wall of the furnace, each secondary wind box is a trapezoidal isobaric wind box, connected to the primary air main pipe through the secondary air distribution pipe, and used to evenly distribute the static pressure entering the secondary wind box; The upper secondary air branch pipe and the lower secondary air branch pipe are connected to the upper isobaric secondary air box and the lower isobaric secondary air box respectively, and are used to transport the secondary air to the furnace; The throttling air ring is arranged at the ends of the upper secondary air branch pipe and the lower secondary air branch pipe, and is used to adjust the air volume flow of the secondary air branch pipe so that the air volume of each branch pipe in the same secondary air box is consistent.

2. The isobaric secondary air system with zoned adjustment for a 660MW super-large CFB boiler according to claim 1 is characterized in that: It also includes a secondary air distribution damper, which is arranged on the secondary air distribution pipe and is used to adjust the air volume entering the secondary air box.

3. The isobaric secondary air system with zoned adjustment for a 660MW super-large CFB boiler according to claim 2 is characterized in that: in, The secondary air boxes are distributed in such a way that four secondary air boxes are respectively arranged on the front wall and the rear wall of the furnace.

4. The isobaric secondary air system with zoned adjustment for a 660MW super-large CFB boiler according to claim 3 is characterized in that: The secondary air boxes are arranged in two layers, upper and lower layers. Each secondary air box is connected to the primary air main pipe through a separate secondary air distribution pipe, and zone adjustment is achieved through the secondary air distribution damper.

5. The isobaric secondary air system with zoned adjustment for a 660MW super-large CFB boiler according to claim 4 is characterized in that: The trapezoidal isobaric secondary air box realizes uniform distribution of static pressure inside the secondary air box, and the throttling air ring realizes consistent air volume flow of the secondary air branch pipe by adjusting the size.

6. A 660MW super large CFB boiler, characterized in that: The boiler includes the isobaric secondary air system according to claim 1.

7. A control method for a zone-adjustable isobaric secondary air system for a 660MW super-large CFB boiler, characterized in that: The method is implemented based on the system described in claim 1, comprising the following steps: The steps of obtaining boiler operating parameters, including furnace temperature distribution, pressure distribution and fuel characteristics; Steps for collecting secondary air box air volume, static pressure and secondary air branch pipe flow data; Control the opening of the secondary air distribution damper, adjust the air volume entering the secondary air box, and adjust the air volume distribution steps according to the combustion conditions; Steps for optimizing zone air volume and branch flow control based on real-time feedback of combustion status.

8. A computer storage medium for storing a computing program, characterized in that: When the computer program is read by a computer, the computer executes the method of claim 7.

9. A computer, comprising a processor and a storage medium, characterized in that: When the processor reads the computer program stored in the storage medium, the computer executes the method of claim 7 .

10. A computer program product, being a computer program, characterized in that When the computer program is executed, the method of claim 7 is implemented.

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