System for preventing dust accumulation in air duct

Abstract

The invention relates to the technical field of boiler auxiliary equipment, and discloses a system for preventing dust accumulation in an air duct. The positioner is rotationally connected in the detection box; at least one spoiler is fixedly connected to the periphery of the positioner; the power structure is connected with the positioner and is suitable for driving the positioner to rotate so as to drive the spoiler to swing, so that the flow direction of flue gas flowing through the detection box in the air duct is changed, accumulated ash in the air duct is raised to form fly ash, and the fly ash is taken away by the flue gas; the control module is in signal connection with the power structure and is suitable for controlling swing of the spoiler through the power structure. The spoiler swings in the detection box to change the flow direction of the flue gas in the detection box, so that the flow direction of the flue gas in the air duct is changed, the capability of flue gas fluid carrying fly ash is improved, accumulated ash is prevented from being deposited in the air duct, and the structural stability and the air circulation area of the air duct are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of boiler auxiliary equipment, and in particular to a system for preventing dust accumulation in an air duct. Background Art

[0002] During the operation of the power station boiler, the dust generated by the combustion of the fuel flows into the flue with the flue gas, forming ash accumulation. The flue is connected to the rotary air preheater, and a heat exchange element is provided on the rotary air preheater; as the rotary air preheater rotates, the ash accumulation in the flue is easily brought into the secondary hot air duct, and gradually deposited at the bottom of the secondary hot air duct, forming a large amount of ash accumulation. The above-mentioned ash accumulation in the secondary hot air duct seriously affects the structural stability of the secondary hot air duct and the air circulation area in the secondary hot air duct. Summary of the invention

[0003] In view of this, the present invention provides a system for preventing dust accumulation in the air duct, so as to solve the problem that the dust accumulation caused by the rotation of the rotary air preheater is easily brought into the secondary hot air duct, causing a large amount of dust to accumulate in the secondary hot air duct, thereby seriously affecting the structural stability of the secondary hot air duct and the air circulation area in the secondary hot air duct.

[0004] The present invention provides a system for preventing dust accumulation in an air duct, comprising:

[0005] A detection box is provided with an inlet and an outlet; the detection box is suitable for being connected to the air duct, and the detection box is in communication with the air duct;

[0006] At least one positioner is rotatably connected to a position near the inlet and / or the outlet in the detection box, the positioner is arranged in a horizontal direction, and the positioner is arranged perpendicular to the direction of smoke flow in the detection box;

[0007] at least one spoiler fixedly connected to the outer periphery of the positioner;

[0008] A power structure is arranged on the detection box and connected to the positioner. The power structure is suitable for driving the positioner to rotate, thereby driving the spoiler to swing, so as to change the direction of the smoke flowing through the detection box in the air duct, thereby lifting the accumulated ash in the air duct to form fly ash, which is carried away by the smoke;

[0009] A control module is connected to the power structure signal, and the control module is suitable for controlling the swing angle of the spoiler through the power structure. Beneficial effect: The present application adopts the above technical solution, and the spoiler swings in the detection box to change the direction of the flue gas in the detection box, thereby changing the direction of the flue gas in the air duct, and increasing the ability of the flue gas fluid to carry fly ash, so as to prevent the accumulation of ash in the air duct, and ensure the structural stability of the air duct and the air circulation area of ​​the air duct. In addition, the system for preventing ash accumulation in the air duct described in the present application has a simple structure and is easy to install, and is suitable for dust removal in the secondary hot air duct of various types of power station boilers.

[0010] Optionally, it also includes:

[0011] A concentration sensor is arranged in the detection box, the concentration sensor is connected to the control module signal, and the concentration sensor is suitable for obtaining the fly ash concentration in the detection box in real time; the control module is suitable for increasing the swing angle of the spoiler in real time when the fly ash concentration exceeds the set concentration threshold, so that the fly ash flies out of the air duct through the detection box. Beneficial effect: The present application adopts the above technical solution, and through real-time monitoring of the fly ash concentration, automatically controls the swing of the spoiler, changes the flow direction of the flue gas, accelerates the lifting and discharge of the fly ash, helps to improve the operation efficiency and reliability of the air duct, and reduces maintenance costs.

[0012] Optionally, it also includes:

[0013] A wind speed sensor is arranged in the detection box, the wind speed sensor is connected to the control module signal, and the wind speed sensor is suitable for obtaining the flue gas flow velocity in the detection box in real time; the control module is suitable for swinging the spoiler in real time to an angle parallel to the flue gas flow direction when the flue gas flow velocity is lower than the set wind speed threshold. Beneficial effect: The present application adopts the above technical solution, which can confirm the ventilation condition in the detection box in real time, and then confirm the ventilation condition in the air duct. By real-time monitoring of the flue gas flow velocity, the swing of the spoiler is automatically controlled to increase the speed of the flue gas flow, promote the departure of fly ash, and help improve the operation efficiency and reliability of the air duct and reduce maintenance costs.

[0014] Optionally, it also includes:

[0015] A temperature sensor is arranged in the detection box, and the temperature sensor is connected to the control module signal, and the temperature sensor is suitable for obtaining the temperature in the detection box in real time; the control module is suitable for reducing the swing angle of the spoiler in real time to reduce the flow area when the temperature in the detection box is higher than the set temperature threshold. Beneficial effect: The present application adopts the above technical solution to ensure that the detection box operates within a safe temperature range, thereby ensuring that the air duct operates within a safe temperature range, and automatically controls the swing of the spoiler by real-time monitoring of the temperature in the detection box, reducing the flow area, and making the smoke flow more concentrated and smooth, thereby reducing the fly ash deposition caused by the temperature influence, reducing dust adhesion, and helping to improve the operation efficiency and reliability of the air duct and reduce maintenance costs.

[0016] Optionally, it also includes:

[0017] A pressure sensor is arranged in the detection box, the pressure sensor is connected to the control module signal, and the pressure sensor is suitable for obtaining the gas pressure in the detection box in real time; the control module is suitable for increasing the swing frequency of the spoiler in real time when the gas pressure in the detection box is higher than the set pressure threshold. Beneficial effect: This application adopts the above technical solution to ensure the normal flow of smoke, and automatically controls the rapid swing of the spoiler by real-time monitoring of the gas pressure in the detection box, stimulates the flow of smoke, reduces dust accumulation, reduces the resistance of smoke flow, and balances the pressure, which helps to improve the operation efficiency and reliability of the air duct and reduce maintenance costs.

[0018] Optionally, it also includes:

[0019] A dust accumulation thickness measuring sensor is arranged in the air duct, the dust accumulation thickness measuring sensor is connected to the control module signal, and the dust accumulation thickness measuring sensor is suitable for obtaining the dust accumulation thickness in the air duct in real time; the control module is suitable for starting the spoiler in real time to swing when the dust accumulation thickness in the air duct is higher than the set thickness threshold. Beneficial effect: This application adopts the above technical solution, and automatically controls the swing of the spoiler by real-time monitoring of the dust accumulation thickness in the air duct, which helps to improve the operation efficiency and reliability of the air duct and reduce maintenance costs.

[0020] Optionally, a first flange structure and a second flange structure are respectively provided at the inlet and outlet of the detection box; the detection box is sealed and connected to the part of the air duct suitable for disconnection through the first flange structure and the second flange structure; the power structure is an electric motor. Beneficial effect: The present application adopts the above technical solution to facilitate the installation and connection of the detection box to the air duct.

[0021] Optionally, it also includes:

[0022] The guide plate is curved and wavy along the direction of the flue gas flow, and the guide plate is arranged on the side wall of the detection box through a positioning plate. Beneficial effect: The present application adopts the above technical solution to guide the fly ash to fly out through the guide plate.

[0023] Optionally, it also includes:

[0024] A vibration structure is arranged on the positioning plate, and the vibration structure is suitable for generating vibration and transmitting the vibration to the guide plate through the positioning plate to reduce dust deposited on the guide plate. Beneficial effect: The present application adopts the above technical solution, and by setting a vibration structure, dust accumulation on the guide plate itself is prevented, thereby achieving the purpose of self-cleaning.

[0025] Optionally, the vibration structure is an electromagnetic vibrator or a vibration motor. Beneficial effects: The present application adopts the above technical solution, and by setting the vibration structure as an electromagnetic vibrator or a vibration motor, it has the advantages of simple structure and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 Schematic diagram of the three-dimensional structure of the system for preventing dust accumulation in the air duct provided in an embodiment of the present invention Figure 1 ;

[0028] Figure 2 It is a partial front view structural schematic diagram of a system for preventing dust accumulation in an air duct provided in an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the internal three-dimensional structure of a system for preventing dust accumulation in an air duct provided in an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the three-dimensional structure of the system for preventing dust accumulation in the air duct provided in an embodiment of the present invention Figure 2 .

[0031] Description of reference numerals:

[0032] 1. Detection box; 2. Inlet; 3. Outlet; 4. Positioner; 5. Spoiler; 6. Power structure; 7. Control module; 8. Concentration sensor; 9. Wind speed sensor; 10. Temperature sensor; 11. Pressure sensor; 12. First flange structure; 13. Second flange structure; 14. Guide plate; 15. Positioning plate; 16. Vibration structure; 17. Sealing cover. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0034] like Figures 1 to 4 A specific embodiment of the system for preventing dust accumulation in the air duct shown in the figure comprises: at least one positioner 4, at least one spoiler 5, a power structure 6 and a control module 7. The air duct is a secondary hot air duct matched with a boiler. Figure 2 As shown, the control module 7 can be arranged on the sealing cover 17 at the front of the detection box 1.

[0035] like Figure 1 and Figure 3 As shown, the detection box 1 is provided with an inlet 2 and an outlet 3; the detection box 1 is suitable for being connected to the air duct, and the detection box 1 is in communication with the air duct. Two positioners 4 are respectively rotatably connected to the positions near the inlet 2 and the outlet 3 in the detection box 1, the positioners 4 are arranged in the horizontal direction, and the positioners 4 are arranged perpendicular to the direction of the flue gas flow in the detection box 1; the positioner 4 can be a rotating shaft. A plurality of spoilers 5 are fixedly connected to the outer periphery of the positioner 4 at intervals. The power structure 6 is arranged on the detection box 1, and the power structure 6 is connected to the positioner 4. The power structure 6 is suitable for driving the positioner 4 to rotate, and then driving the spoiler 5 to swing, so as to change the direction of the flue gas flowing through the detection box 1 in the air duct, and then lift the accumulated ash in the air duct to form fly ash, which is carried away by the flue gas. The control module 7 is connected to the power structure 6 by signal, and the control module 7 is suitable for controlling the swing angle of the spoiler 5 through the power structure 6.

[0036] like Figure 3 and Figure 4As shown, the system for preventing dust accumulation in the air duct described in the present application also includes: a concentration sensor 8, which is arranged in the detection box 1, and the concentration sensor 8 is connected to the control module 7 by signal, and the concentration sensor 8 is suitable for obtaining the fly ash concentration in the detection box 1 in real time; the control module 7 is suitable for increasing the swing angle of the spoiler 5 in real time when the fly ash concentration exceeds the set concentration threshold, so that the fly ash flies out of the air duct through the detection box 1. For example, the swing angle can be adjusted to a swing angle of 30° or more. Specifically, the concentration sensor 8 can be a particle sensor or a laser dust sensor, etc.

[0037] like Figure 3 and Figure 4 As shown, the system for preventing dust accumulation in the air duct described in the present application also includes: a wind speed sensor 9, which is arranged in the detection box 1, and the wind speed sensor 9 is signal-connected to the control module 7, and the wind speed sensor 9 is suitable for obtaining the flue gas flow rate in the detection box 1 in real time; the control module 7 is suitable for swinging the spoiler 5 in real time to an angle parallel to the flue gas flow direction when the flue gas flow rate is lower than the set wind speed threshold.

[0038] Since the air duct is at high temperature, dust may melt or adhere. Figure 3 and Figure 4 As shown, the system for preventing dust accumulation in the air duct described in the present application also includes: a temperature sensor 10, which is arranged in the detection box 1, and the temperature sensor 10 is signal-connected to the control module 7, and the temperature sensor 10 is suitable for obtaining the temperature in the detection box 1 in real time; the control module 7 is suitable for reducing the swing angle of the spoiler 5 in real time to reduce the flow area when the temperature in the detection box 1 is higher than the set temperature threshold.

[0039] like Figure 3 and Figure 4 As shown, the system for preventing dust accumulation in the air duct described in the present application further includes: a pressure sensor 11, which is arranged in the detection box 1, and the pressure sensor 11 is connected to the control module 7 by signal, and the pressure sensor 11 is suitable for obtaining the gas pressure in the detection box 1 in real time; the control module 7 is suitable for increasing the swing frequency of the spoiler 5 in real time when the gas pressure in the detection box 1 is higher than the set pressure threshold. The gas pressure can be the gas pressure difference before and after the spoiler 5 in the detection box 1.

[0040] like Figure 3 and Figure 4As shown, the system for preventing dust accumulation in the air duct described in the present application also includes: a dust thickness measuring sensor, which is arranged in the air duct, and the dust thickness measuring sensor is connected to the control module 7 by signal, and the dust thickness measuring sensor is suitable for obtaining the dust thickness in the air duct in real time; the control module 7 is suitable for starting the spoiler 5 in real time to swing it when the dust thickness in the air duct is higher than the set thickness threshold.

[0041] The concentration sensor 8, wind speed sensor 9, temperature sensor 10, pressure sensor 11 and dust thickness measurement sensor are collectively referred to as sensors. The sensors are made of synthetic materials and metal alloys that are resistant to environmental changes. Specifically, a high-temperature resistant shell can be used, that is, the shell is designed to have the characteristics of high temperature resistance and high humidity resistance, and can work normally during boiler operation. The sensor can use sensitive elements, usually ceramics or special alloy materials, to ensure long-term stable performance and accurate measurement performance. The sensor adopts a sealed design to ensure the safety of the electronic components inside the sensor and avoid degradation of working performance due to temperature and pressure changes. Figure 2 As shown, the control module 7 is also provided with a housing, and can cooperate with a manual touch panel, that is, the swing of the spoiler 5 can also be controlled by the control module 7 through the manual touch panel. The housing of the control module 7 can be made of heat-resistant plastic. The housing made of heat-resistant plastic can resist the potential heat in the working environment of the boiler and protect the electronic components in the control module 7. Specifically, the power structure 6 is an electric motor. The electric motor adopts an aluminum alloy housing, which has the advantages of being light, rust-proof and corrosion-resistant, and is suitable for the working environment inside the boiler. The electric motor is provided with an additional protective coating to increase the heat resistance and corrosion resistance. The spoiler 5 is made of high-temperature resistant, high-pressure resistant and corrosion-resistant stainless steel, and the stainless steel has certain strength and toughness. The high-temperature resistance means that the spoiler 5 can withstand the high-temperature gas generated during the operation of the boiler, and the temperature resistance can usually reach 800°C or higher. The high-pressure resistance means that the spoiler 5 adapts to the high-pressure environment inside the boiler, which can effectively prevent the spoiler 5 from deforming or damaging the material when the pressure changes. The corrosion resistance means that the stainless steel used to make the spoiler 5 contains specially designed alloy elements such as chromium and nickel, which enables the spoiler 5 to resist corrosion from high-temperature water vapor, acidic gases and ash, and is particularly suitable for long-term operation at high temperatures. The acidic gases include: SO 2and HCl, etc. The stainless steel used to make the spoiler 5 has good strength and toughness, can withstand the impact of flue gas flow and mechanical wear, and prevent cracks or fatigue damage. The positioner 4 can be made of lightweight, high-strength, corrosion-resistant and low-friction engineering plastics or composite materials. Lightweight and high-strength means that the engineering plastics or composite materials can provide sufficient strength while reducing the overall weight, making it easy to install and maintain. Corrosion resistance means that the engineering plastics or composite materials can resist the humid and corrosive environment during boiler operation, ensuring long-term stable operation. The low friction coefficient can reduce the friction when the positioner 4 rotates, thereby improving the reaction speed and flexibility.

[0042] Further, such as Figure 3 As shown, if fly ash is still accumulated in the air duct after several rounds of swinging of the spoiler 5, a larger range of cleaning measures can be considered, for example, the cleaning frequency can be further increased or manual intervention cleaning can be performed.

[0043] Further, such as Figure 1 and Figure 3 As shown, the inlet 2 and the outlet 3 of the detection box 1 are respectively provided with a first flange structure 12 and a second flange structure 13; the detection box 1 is sealed and connected to the part of the air duct suitable for disconnection through the first flange structure 12 and the second flange structure 13.

[0044] Further, such as Figure 3 As shown, the system for preventing dust accumulation in the air duct described in the present application also includes: a guide plate 14, which is curved and wavy along the direction of the smoke flow, and the guide plate 14 is arranged on the side wall of the detection box 1 through a positioning plate 15.

[0045] Further, such as Figure 3 As shown, the system for preventing dust accumulation in the air duct described in the present application further includes: a vibration structure 16. The vibration structure 16 is arranged on the positioning plate 15, and the vibration structure 16 is suitable for generating vibration and transmitting the vibration to the guide plate 14 through the positioning plate 15 to reduce the dust deposited on the guide plate 14. The vibration structure 16 can be started periodically. Specifically, the vibration structure 16 is an electromagnetic vibrator or a vibration motor.

[0046] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A system for preventing dust accumulation in an air duct, characterized in that: include: A detection box (1) is provided with an inlet (2) and an outlet (3); the detection box (1) is suitable for being connected to an air duct, and the detection box (1) is in communication with the air duct; at least one positioner (4) rotatably connected to a position in the detection box (1) close to the inlet (2) and / or the outlet (3), the positioner (4) being arranged in a horizontal direction and being arranged perpendicular to the direction of smoke flow in the detection box (1); at least one spoiler (5) fixedly connected to the outer periphery of the positioner (4); A power structure (6) is arranged on the detection box (1), and the power structure (6) is connected to the positioner (4). The power structure (6) is suitable for driving the positioner (4) to rotate, thereby driving the spoiler (5) to swing, so as to change the direction of the smoke flowing through the detection box (1) in the air duct, thereby lifting the accumulated ash in the air duct to form fly ash, which is carried away by the smoke; A control module (7) is connected to the power structure (6) by signals, and the control module (7) is suitable for controlling the swing angle of the spoiler (5) through the power structure (6).

2. The system for preventing dust accumulation in the air duct according to claim 1, characterized in that: Also includes: A concentration sensor (8) is arranged in the detection box (1), the concentration sensor (8) is connected to the control module (7) by signal, and the concentration sensor (8) is suitable for obtaining the fly ash concentration in the detection box (1) in real time; the control module (7) is suitable for increasing the swing angle of the spoiler (5) in real time when the fly ash concentration exceeds a set concentration threshold value, so that the fly ash passes through the detection box (1) and flies out of the air duct.

3. The system for preventing dust accumulation in the air duct according to claim 1, characterized in that: Also includes: A wind speed sensor (9) is arranged in the detection box (1), the wind speed sensor (9) is connected to the control module (7) by signal, and the wind speed sensor (9) is suitable for obtaining the flue gas flow velocity in the detection box (1) in real time; the control module (7) is suitable for swinging the spoiler (5) in real time to an angle parallel to the flue gas flow direction when the flue gas flow velocity is lower than a set wind speed threshold.

4. The system for preventing dust accumulation in the air duct according to claim 1, characterized in that: Also includes: A temperature sensor (10) is arranged in the detection box (1), the temperature sensor (10) is connected to the control module (7) by signal, and the temperature sensor (10) is suitable for obtaining the temperature in the detection box (1) in real time; the control module (7) is suitable for reducing the swing angle of the spoiler (5) in real time to reduce the flow area when the temperature in the detection box (1) is higher than a set temperature threshold.

5. The system for preventing dust accumulation in the air duct according to claim 1, characterized in that: Also includes: A pressure sensor (11) is arranged in the detection box (1), the pressure sensor (11) is connected to the control module (7) by signal, and the pressure sensor (11) is suitable for obtaining the gas pressure in the detection box (1) in real time; the control module (7) is suitable for increasing the swing frequency of the spoiler (5) in real time when the gas pressure in the detection box (1) is higher than a set pressure threshold.

6. The system for preventing dust accumulation in the air duct according to claim 1, characterized in that: Also includes: A dust accumulation thickness measuring sensor is arranged in the air duct, the dust accumulation thickness measuring sensor is connected to the control module (7) by signal, and the dust accumulation thickness measuring sensor is suitable for obtaining the dust accumulation thickness in the air duct in real time; the control module (7) is suitable for starting the spoiler (5) in real time to swing when the dust accumulation thickness in the air duct is higher than a set thickness threshold.

7. The system for preventing dust accumulation in an air duct according to any one of claims 1 to 6, characterized in that: A first flange structure (12) and a second flange structure (13) are respectively provided at the inlet (2) and the outlet (3) of the detection box (1); the detection box (1) is sealedly connected to a portion of the air duct suitable for disconnection via the first flange structure (12) and the second flange structure (13); and the power structure (6) is an electric motor.

8. The system for preventing dust accumulation in an air duct according to any one of claims 1 to 6, characterized in that: Also includes: The guide plate (14) is in a curved wave shape along the direction of flow of the smoke, and the guide plate (14) is arranged on the side wall of the detection box (1) through a positioning plate (15).

9. The system for preventing dust accumulation in the air duct according to claim 8, characterized in that: Also includes: A vibration structure (16) is arranged on the positioning plate (15), and the vibration structure (16) is suitable for generating vibration and transmitting the vibration to the guide plate (14) via the positioning plate (15), so as to reduce dust deposited on the guide plate (14).

10. The system for preventing dust accumulation in the air duct according to claim 9, characterized in that: The vibration structure (16) is an electromagnetic vibrator or a vibration motor.

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