Boiler dynamic combustion adjusting method, system, equipment and medium

Abstract

The invention relates to the technical field of boiler dynamic combustion adjustment, in particular to a boiler dynamic combustion adjustment method, system, equipment and medium, and the method comprises the following steps: dividing two adjacent combustors on a front wall and a rear wall into a group of operation units along the width direction of a hearth; and the opening degrees of the secondary air baffles of all the operation units are sequentially preset and adjusted. The method has the beneficial effects that the dual goals of improving the boiler efficiency and reducing the operation cost are achieved, and an efficient combustion regulation and control scheme without hardware transformation is provided for a high-parameter unit.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler dynamic combustion adjustment, in particular to a boiler dynamic combustion adjustment method, system, equipment and medium. Background Art

[0002] The W-shaped flame boiler with a double cyclone burner is a common type of power plant boiler, offering good adaptability to various coal types and stable combustion. During high-load operation, a secondary air distribution system with a larger center and smaller sides is typically used to increase air supply to the center of the furnace and alleviate oxygen-deficient combustion in this area.

[0003] However, there are some problems in the operation of the W-shaped flame boiler with double cyclone burners in the prior art. First, since the secondary air distribution method is basically fixed, the pulverized coal airflow mixes with the secondary air after coming out of the burner nozzle, and each group of burners basically presents parallel airflow, with less mixing in the furnace width direction, resulting in the pulverized coal airflow only mixing in the furnace height direction, which easily causes local oxygen-deficient combustion in the lower furnace. Secondly, boiler combustion is a dynamic process. Affected by factors such as coal quality, furnace structure and air distribution method, the local oxygen-deficient area often changes, and it is difficult to accurately monitor it in real time with existing technical means. In order to improve the combustion economy, when the secondary air distribution method of each burner is basically fixed, the method of increasing the total air volume of the boiler is usually adopted to increase the oxygen content at the furnace outlet, but this combustion method will lead to excessive oxygen in local areas and excessive overall air supply, resulting in increased smoke exhaust losses and reduced boiler efficiency. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention provides a method for dynamic combustion adjustment of a boiler, comprising dividing two adjacent burners on the front wall and the rear wall into a group of operating units along the width direction of the furnace;

[0006] The opening of the secondary air dampers of all operating units is preset and adjusted in sequence.

[0007] As a preferred solution of the boiler dynamic combustion adjustment method of the present invention, the preset adjustment includes:

[0008] Make sudden adjustments to the opening of the secondary air damper of the current operating unit;

[0009] After maintaining the adjusted opening for a preset period of time, the secondary air damper of the current operating unit is restored to its original opening.

[0010] As a preferred embodiment of the boiler dynamic combustion adjustment method of the present invention, the sudden adjustment includes:

[0011] If the original opening of the secondary air damper of the current operating unit is greater than or equal to the first threshold, adjusting the current opening to the first target opening;

[0012] If the original opening of the secondary air damper of the current operating unit is less than the first threshold, the current opening is adjusted to the second target opening.

[0013] As a preferred solution of the boiler dynamic combustion adjustment method of the present invention, the preset adjustment also includes restoring the secondary air damper of the current operating unit to the original opening and then immediately starting the next group of operating units.

[0014] As a preferred solution of the boiler dynamic combustion adjustment method of the present invention, the next group of operating units are operating units that are sequentially advanced along the width direction of the furnace.

[0015] As a preferred solution of the boiler dynamic combustion adjustment method of the present invention, the first threshold is 80%; the first target opening is 50%; and the second target opening is 100%.

[0016] As a preferred solution of the boiler dynamic combustion adjustment method of the present invention, the preset time length is 10 minutes.

[0017] In a second aspect, the present invention provides a boiler dynamic combustion adjustment system, comprising: a definition module for dividing two adjacent burners on the front wall and the rear wall into a group of operation units along the width direction of the furnace;

[0018] The adjustment module is used to preset and adjust the opening of the secondary air dampers of all operating units in sequence.

[0019] In a third aspect, the present invention provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0020] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the above method when the computer program is executed by a processor.

[0021] Compared with the existing technology, the beneficial effects of the present invention are as follows: by adjusting the secondary air damper openings of adjacent burners in a grouped, cyclic, and sudden manner along the width of the furnace, and setting a 10-minute reset mechanism, the traditional steady-state air distribution mode is broken. At the same time, the flue gas squeezing effect is used to enhance the airflow disturbance in the width of the furnace, eliminate local oxygen-deficient areas, and avoid incomplete combustion of pulverized coal; significantly reduce the carbon content of fly ash and exhaust losses, and improve the thermal efficiency of the boiler; reduce the total air volume at the same combustion efficiency, and simultaneously reduce fuel consumption; suppress the risk of coking through dynamic disturbances, and maintain long-term stable operation of the boiler. Ultimately, the dual goals of improving boiler efficiency and reducing operating costs are achieved, providing a high-efficiency combustion control solution for high-parameter units that does not require hardware modification. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a flow chart of the boiler dynamic combustion adjustment method.

[0024] Figure 2 This is a cross-sectional diagram of a W-shaped flame boiler with double cyclone burners.

[0025] Figure 3 Schematic diagram of the cross-sectional flow field of a W-shaped flame boiler with double cyclone burners. DETAILED DESCRIPTION

[0026] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0027] Example 1, with reference to Figure 1 , which is the first embodiment of the present invention, provides a method for dynamic combustion adjustment of a boiler, comprising:

[0028] S100: along the width direction of the furnace, two adjacent burners on the front wall and the rear wall are divided into a group of operating units;

[0029] S200: Preset and adjust the openings of the secondary air dampers of all operating units in sequence.

[0030] It should be noted that during the operation of a W-flame boiler with a double cyclone burner, the pulverized coal airflow mixes with the secondary air after coming out of the burner nozzle, and each group of burners basically presents a parallel airflow, with less mixing in the furnace width direction. This traditional air distribution method results in the pulverized coal airflow being mixed only in the furnace height direction, which can easily cause local oxygen-deficient combustion in the lower furnace. Since boiler combustion is a dynamic process, it is affected by factors such as coal quality, furnace structure and air distribution method, and the local oxygen-deficient area often changes, and it is difficult to accurately monitor it in real time with existing technical means. Under the existing steady-state operation mode, the opening of the secondary air damper basically does not change, and the problem of local oxygen-deficient combustion cannot be effectively solved. In order to improve the combustion economy, the method of increasing the total air volume of the boiler is usually adopted to increase the oxygen content at the furnace outlet, but this will lead to excessive oxygen content in local areas and excessive overall air supply, resulting in increased smoke exhaust losses and reduced boiler efficiency.

[0031] Therefore, to address the aforementioned issues, steps S100-S200 are implemented to dynamically adjust the furnace width, enhancing airflow disturbance across the furnace width. This ensures thorough mixing of the pulverized coal across the furnace width, preventing localized oxygen-deficient combustion. This preset adjustment method reduces exhaust losses, improves boiler efficiency, and prevents boiler coking without increasing total air volume. Furthermore, this dynamic adjustment method can be flexibly adjusted based on the actual operating conditions of the boiler, adapting to varying coal qualities and load conditions, demonstrating its high applicability and practicality.

[0032] Example 2, reference Figures 1 to 3 , which is an embodiment of the present invention, provides a boiler dynamic combustion adjustment method based on the above embodiment.

[0033] In the embodiment of the present application, in step S100, two adjacent burners on the front wall and the rear wall are divided into a group of operating units along the width direction of the furnace, including the following steps A1-A2:

[0034] It is understandable that the double cyclone burner W-type flame boiler is a direct current burner, such as Figure 2 As shown, it includes a burner nozzle 1 and a corresponding secondary air baffle 2, front and rear wall water-cooling walls 3 and side wall water-cooling walls 4. Figure 3 This is a mapping diagram of the boiler's main structure, consisting of an upper furnace 6, front and rear arches 7, front and rear water-cooled walls 3, and a lower furnace 5, connected from top to bottom. The front and rear arches 7 are provided with primary air burner nozzles 1, and the front and rear water-cooled walls 3 are provided with secondary air nozzles 8 at furnace level. There is a one-to-one correspondence between the secondary air nozzles 8 and the secondary air baffles. The secondary air nozzles 8 carry hot air, while the primary air nozzles 1 carry pulverized coal. The secondary air nozzles 8 and primary air nozzles 1 are arranged symmetrically with the furnace center 9-1 as the plane of symmetry.

[0035] For example, in the attached Figure 2 The burner (1), burner (2), burner (1') and burner (2') shown in FIG. 1 are a set of operating units.

[0036] In the embodiment of the present application, in step S200, the openings of the secondary air dampers of all the operating units are preset and adjusted in sequence, including the following steps A1-A2:

[0037] A1: Sudden adjustment of the opening of the secondary air damper of the current operating unit;

[0038] A2: After maintaining the adjusted opening for a preset period of time, the secondary air damper of the current operating unit is restored to its original opening;

[0039] It should be noted that the default setting is 10 minutes

[0040] A3: After restoring the secondary air damper of the current operating unit to its original opening, immediately start the next group of operating units.

[0041] It should be noted that the next group of operating units are operating units that are advanced sequentially along the width direction of the furnace.

[0042] Specifically, in step A1, the sudden adjustment includes the following steps A11-A12:

[0043] A11: If the original opening of the secondary air damper of the current operating unit is greater than or equal to the first threshold, adjust the current opening to the first target opening;

[0044] A12: If the original opening of the secondary air damper of the current operating unit is less than the first threshold, the current opening is adjusted to the second target opening.

[0045] It should be noted that the first threshold is 80%; the first target opening is 50%; and the second target opening is 100%.

[0046] For example, assuming that the openings of the front and rear walls are symmetrical, and the original openings of the secondary air dampers corresponding to the burners (1) and (2) are 40% and 30% respectively, according to the above mutation adjustment, that is:

[0047] At the same time, the openings of the secondary air dampers corresponding to the burner (1), the burner (2), the burner (1'), and the burner (2') are uniformly adjusted to 100%, and the 100% opening is maintained for 10 minutes. After 10 minutes, the openings of the secondary air dampers corresponding to the burner (1), the burner (2), the burner (1'), and the burner (2') are restored to their original openings (40% and 30%).

[0048] Furthermore, the process switches to the next group of operating units and executes the above adjustment process until all operating units are covered and the process is repeated.

[0049] In order to verify the advantages of the present invention, a test was conducted. The basic information includes: the unit load is 500.2MW, the pressures of the secondary air boxes before and after the DCS are online are 0.44 and 0.54kPa respectively, the opening distribution of the secondary air damper is the conventional "convex" air distribution in power plants, and the openings of the secondary air dampers before and after adjustment are shown in Table 1. The distribution of flue gas O2 and CO is tested at the economizer outlet, and the test results are shown in Table 2:

[0050] Table 1 Opening of secondary air damper before and after adjustment (unit: %)

[0051]

[0052] Table 2 O2 and CO distribution in economizer outlet flue gas before adjustment

[0053]

[0054]

[0055] It should be noted that, as can be seen from Table 2, under the current air distribution mode, the overall O2 content distribution on the B side of the flue gas at the economizer outlet is lower than that on the A side, and the CO content distribution is opposite to it. In addition, there is local oxygen-deficient combustion and high CO, which indicates that local oxygen-deficient combustion has a great impact on the economy of the boiler, echoing the problems existing in the existing technology mentioned in the background of the technical solution, and further highlighting the necessity and pertinence of this technical solution.

[0056] After following the above method, the flue gas O2 and CO distribution test was carried out again at the economizer outlet. The test results are shown in Table 3. The fly ash carbon content analysis results before and after adjustment are shown in Table 4.

[0057] Table 3 O2 and CO distribution of flue gas at economizer outlet after adjustment

[0058]

[0059] Table 4 Analysis results of fly ash carbon content before and after adjustment

[0060]

[0061] It can be seen from Tables 3 and 4 that, with the unit load basically unchanged, the fuel volume decreased by 16 t / h and the total air volume decreased by 73 t / h after adjustment. At the same time, there was no local O2 deficiency in the furnace width direction on the A and B sides, the CO content was also ideal (maximum 507 mg / m3), and the carbon content in the fly ash decreased significantly.

[0062] In summary, the present invention proposes a dynamic combustion adjustment method for a W-type flame boiler with double cyclone burners, that is, by adjusting the secondary air damper openings of adjacent burners in a grouped cyclic and sudden manner along the width of the furnace, and setting a 10-minute reset mechanism, breaking the traditional steady-state air distribution mode. At the same time, this method utilizes the flue gas squeezing effect to enhance the airflow disturbance in the width direction of the furnace, eliminates local oxygen-deficient areas, and avoids incomplete combustion of pulverized coal; significantly reduces the carbon content of fly ash and exhaust losses, and improves the thermal efficiency of the boiler; reduces the total air volume at the same combustion efficiency, and simultaneously reduces fuel consumption; suppresses the risk of coking through dynamic disturbances, and maintains long-term stable operation of the boiler. Ultimately, the dual goals of improving boiler efficiency and reducing operating costs are achieved, providing a high-efficiency combustion control solution for high-parameter units that does not require hardware modification.

[0063] Example 3. The above is a schematic scheme of a method for dynamic boiler combustion adjustment. It should be noted that the technical scheme of this system for dynamic boiler combustion adjustment is based on the same concept as the technical scheme of the method described above. For details not described in detail in the technical scheme of the system for dynamic boiler combustion adjustment in this example, please refer to the description of the technical scheme of the method described above.

[0064] This embodiment also provides a boiler dynamic combustion adjustment system, including:

[0065] A module is defined for dividing two adjacent burners on the front wall and the rear wall into a group of operating units along the width of the furnace;

[0066] The adjustment module is used to preset and adjust the opening of the secondary air dampers of all operating units in sequence.

[0067] This embodiment also provides an electronic device suitable for dynamic combustion adjustment of a boiler, comprising: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute computer-executable instructions to implement the method for dynamic combustion adjustment of a boiler as proposed in the above embodiment.

[0068] This embodiment further provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for implementing dynamic combustion adjustment of a boiler as proposed in the above embodiment is implemented.

[0069] The storage medium proposed in this embodiment and the method for implementing dynamic combustion adjustment of a boiler proposed in the above embodiment belong to the same inventive concept. For technical details not fully described in this embodiment, please refer to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0070] Through the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented with the help of software and necessary general hardware, and of course can also be implemented by hardware. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods of various embodiments of the present invention.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for dynamic combustion adjustment of a boiler, characterized by: include, Along the width direction of the furnace, two adjacent burners on the front wall and the rear wall are divided into a group of operating units; The openings of the secondary air dampers of all the operating units are preset and adjusted in sequence.

2. A method for dynamic combustion adjustment of a boiler according to claim 1, characterized in that: The preset adjustment includes: Performing a sudden adjustment on the opening of the secondary air damper of the current operating unit; After maintaining the adjusted opening for a preset time period, the secondary air damper of the current operating unit is restored to its original opening.

3. A method for dynamic combustion adjustment of a boiler according to claim 2, characterized in that: The sudden adjustment includes: If the original opening of the secondary air damper of the current operating unit is greater than or equal to the first threshold, adjusting the current opening to the first target opening; If the current original opening of the secondary air damper of the operating unit is less than the first threshold, the current opening is adjusted to the second target opening.

4. A method for dynamic combustion adjustment of a boiler according to claim 3, characterized in that: The preset adjustment also includes, after restoring the secondary air baffle of the current operating unit to the original opening, immediately starting the next group of operating units.

5. A method for dynamic combustion adjustment of a boiler according to claim 4, characterized in that: The next group of operating units are the operating units that are advanced sequentially along the width direction of the furnace.

6. A method for dynamic combustion adjustment of a boiler according to any one of claims 1 to 5, characterized in that: The first threshold is 80%; the first target opening is 50%; and the second target opening is 100%.

7. A method for dynamic combustion adjustment of a boiler according to claim 6, characterized in that: The preset duration is 10 minutes.

8. A boiler dynamic combustion adjustment system, applying the method according to any one of claims 1 to 7, characterized in that: include: A module is defined for dividing two adjacent burners on the front wall and the rear wall into a group of operating units along the width of the furnace; The adjustment module is used to perform preset adjustments on the openings of the secondary air baffles of all the operating units in sequence.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: 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 having a computer program stored thereon, 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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