Flow equalizing and resistance reducing device for inlet airflow of secondary layer air pipeline of power station boiler

Abstract

The utility model relates to the technical field of energy conservation and intelligent measurement and control, in particular to a power station boiler secondary layer air pipeline inlet airflow equalizing and resistance reducing device which comprises two fixing plates arranged in a secondary layer air pipe in the radial direction and a driving mechanism arranged on the secondary layer air pipe. The driving mechanism drives the supporting shaft to rotate synchronously, the rectifying plate is arranged on the supporting shaft in series, the airflow vane is rotationally arranged on the supporting shaft located at the center position in the secondary layer air pipe, and the airflow vane is located at the inlet position of the secondary layer air pipe. And a laser wind direction tester for detecting the distance between the indicating arrow on the airflow vane and the secondary layer air pipe is arranged on the secondary layer air pipe. According to the utility model, the rectifying plate is additionally arranged, so that the airflow in the secondary layer air pipe is divided into a plurality of parts, and the rectifying plate and the airflow vane are vertically distributed, so that the secondary layer air pipe is rectified, vortex is eliminated, and uniform flowing of the airflow is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of energy saving and intelligent measurement and control, in particular to an air flow equalization and resistance reduction device at the inlet of a secondary layer air duct of a power station boiler. Background Art

[0002] At present, my country's domestic energy structure is still dominated by thermal power generation, and the situation of thermal power generation will not change for a long time in the future. The so-called thermal power generation usually refers to the use of raw coal as the primary energy source, the refined powder is mixed with hot air in the boiler for combustion, and water is used as the medium to absorb the heat released by the coal combustion and turn it into high-temperature and high-pressure water vapor. The water vapor is sent to the steam turbine generator set to be converted into electrical energy and continuously fed into the power grid. As the main equipment for energy conversion, the safety and economic operation of power station boilers are directly related to the safety of the power grid. With the continuous improvement of the domestic manufacturing level, the single-unit capacity of power station boilers is constantly increasing, and the number and size of the matching air supply ducts are also increasing. Whether the air distribution condition in each air supply duct is uniform and the flow resistance of the hot air entering each air duct are directly related to the safe and economic operation of the boiler.

[0003] The secondary hot air from the inlet main air duct needs to be distributed to eight secondary layer air ducts. The inlet main air duct is at varying distances from the inlets of the eight secondary layer air ducts. To accurately control boiler combustion conditions, the air volume entering each secondary layer air duct must be monitored and adjusted. To this end, air volume measurement devices and air volume control gates are typically installed in each secondary layer air duct. However, due to limited duct space, the straight pipe section used for air volume measurement is very short on almost every level, typically only 1-1.5 times the equivalent straight pipe section. Within this 1-1.5 times equivalent straight pipe section, the inlet airflow in front of the equivalent straight pipe section has vortices due to the entrance angle, and the dampers behind it cause disturbances. Almost all types of air volume measurement devices cannot accurately measure the airflow, as typical air volume measurement devices require 4-5 times the equivalent diameter. This results in a lack of accurate data monitoring for boiler operation control, significantly weakening boiler combustion stability. It is common for the boiler to not experience coke accumulation. Furthermore, vortices increase resistance within the pipe, which in turn increases energy consumption. Utility Model Content

[0004] The utility model aims to solve the above-mentioned defects and provides an air flow equalization and resistance reduction device for the inlet of the secondary layer air duct of a power station boiler, in order to solve the problems of vortex in the inlet air flow and inaccurate air volume measurement due to short straight pipe sections.

[0005] In order to overcome the defects existing in the background technology, the technical solution adopted by the utility model to solve its technical problems is: an airflow equalization and resistance reduction device at the inlet of the secondary layer air duct of a power station boiler, including two fixed plates radially arranged in the secondary layer air duct and a driving mechanism arranged on the secondary layer air duct, a plurality of support shafts are rotatably arranged between the two fixed plates, the driving mechanism is used to drive the support shafts to rotate synchronously, rectifier plates are arranged in series on the support shafts so that the rotation angle of the rectifier plates can be adjusted by the driving mechanism, and an airflow vane is rotatably arranged on the support shaft located at the center position in the secondary layer air duct, and the airflow vane is located at the inlet position of the secondary layer air duct, and a laser wind direction meter for detecting the distance between the indicator arrow on the airflow vane and the secondary layer air duct is provided on the secondary layer air duct, and the laser wind direction meter is electrically connected to the wind direction automatic following intelligent controller and the driving mechanism in sequence.

[0006] A further improvement includes that the driving mechanism includes a worm gear sleeved on the support shaft and a motor provided on the secondary layer air duct, and the worm connected to the output end of the motor is meshed with the worm gear.

[0007] Further improvements include that the driving mechanism includes a worm gear mounted on one of the support shafts and a motor arranged on the secondary layer air duct, the worm connected to the output end of the motor is engaged with the worm gear, a rotating pin is arranged in series at one end of the rectifier plate, and one end of the rotating pin is rotatably connected to the connecting rod so that the rectifier plate rotates synchronously.

[0008] The beneficial effects of the present invention are as follows: the present design divides the airflow in the secondary air duct into multiple parts by adding a rectifier plate, and makes the rectifier plate and the airflow vane distributed vertically, thereby rectifying the airflow in the secondary air duct, thereby eliminating eddy currents on a large scale, ensuring uniform airflow, reducing gas flow resistance, and having obvious energy-saving effects. It further ensures the stability of the air volume measurement device detection, and automatically adjusts the rotation angle of the rectifier plate while detecting the airflow vane through the laser wind direction meter and the wind direction automatic following intelligent controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0010] Figure 1 It is the main view of the utility model;

[0011] Figure 2 It is a right side view of the utility model;

[0012] In the figure, 1-connecting rod, 2-support shaft, 3-airflow vane, 4-worm gear, 5-laser wind direction measuring instrument, 6-wind direction automatic following intelligent controller, 7-motor, 8-worm gear, 9-rectifier plate, 10-secondary layer air duct, 11-fixed plate, 12-rotating pin. DETAILED DESCRIPTION

[0013] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. The embodiments of the basic utility model and all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present utility model.

[0014] according to Figure 1 and Figure 2 As shown, a device for equalizing and reducing airflow resistance at the inlet of the secondary air duct of a power station boiler is provided, comprising two fixed plates 11 radially arranged in the secondary air duct 10 and a driving mechanism arranged on the secondary air duct 10, a plurality of support shafts 2 are rotatably arranged between the two fixed plates 11, the driving mechanism is used to drive the support shafts 2 to rotate synchronously, a rectifier plate 9 is arranged in series on the support shaft 2 so that the rotation angle of the rectifier plate 9 can be adjusted by the driving mechanism, and an airflow vane 3 is rotatably arranged on the support shaft 2 located at the center position in the secondary air duct 10, and the airflow vane 3 is located at the inlet position of the secondary air duct 10, wherein the airflow vane 3 will swing with the airflow and can indicate the direction of the inlet and outlet airflow at any time. Direction, the secondary layer air duct 10 is provided with a laser wind direction measuring instrument 5 for detecting the distance between the indicating arrow on the airflow vane 3 and the secondary layer air duct 10, and the laser wind direction measuring instrument 5 is electrically connected with the wind direction automatic following intelligent controller 6 and the driving mechanism in turn, wherein the laser wind direction measuring instrument 5 is actually a distance measuring device, and the indicating angle of the wind vane can be calculated by measuring the distance from the indicating arrow of the wind vane to the inner wall of the pipe, and the data is sent to the wind direction automatic following intelligent controller 6, and the wind direction automatic following intelligent controller 6 can adjust the angle of the rectifier plate 9 at any time according to the angle instruction driving mechanism of the inlet airflow vane 3, so that the rectifier plate 9 and the airflow vane 3 are vertically distributed, so as to achieve the best rectification effect.

[0015] The driving mechanism includes a worm gear 4 sleeved on the support shaft 2 and a motor 7 arranged on the secondary layer air duct 10. The worm 8 connected to the output end of the motor 7 is meshed with the worm gear 4, so that the worm gear 8 is driven to rotate by the motor 7, and the worm gear 8 drives the worm gear 4 to rotate synchronously, thereby synchronously adjusting the rectifier plate 9 on the support shaft 2. After adjusting the rotation angle of the rectifier plate 9, the rectifier plate 9 is vertically distributed to the airflow vane 3. The inlet airflow impacts the rectifier plate 9, and then the airflow in the pipeline is rectified by multiple rectifier plates 9 to avoid the generation of vortexes, thereby basically eliminating the large-scale vortex of the inlet airflow, reducing the gas flow resistance, and having obvious energy-saving effects.

[0016] The driving mechanism includes a worm gear 4 sleeved on one of the support shafts 2 and a motor 7 arranged on the secondary layer air duct 10. The worm 8 connected to the output end of the motor 7 is meshed with the worm gear 4. A rotating pin 12 is provided in series at one end of the rectifier plate 9. One end of the rotating pin 12 is rotatably connected to the connecting rod 1 so that the rectifier plate 9 rotates synchronously, thereby ensuring the consistency of the rotation of the rectifier plate 9. The rotation of one rectifier plate 9 will drive the remaining rectifier plates 9 to move synchronously.

[0017] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for equalizing and reducing airflow resistance at the inlet of the secondary air duct of a power station boiler, characterized in that: The invention comprises two fixed plates (11) radially arranged in the secondary air duct (10) and a driving mechanism arranged on the secondary air duct (10); a plurality of support shafts (2) are rotatably arranged between the two fixed plates (11); the driving mechanism is used to drive the support shafts (2) to rotate synchronously; a rectifier plate (9) is arranged in series on the support shaft (2) so that the rotation angle of the rectifier plate (9) is adjusted by the driving mechanism; an airflow vane (3) is rotatably arranged on the support shaft (2) located at the center position in the secondary air duct (10); the airflow vane (3) is located at the inlet position of the secondary air duct (10); a laser wind direction measuring instrument (5) for detecting the distance between the indicating arrow on the airflow vane (3) and the secondary air duct (10) is provided on the secondary air duct (10); the laser wind direction measuring instrument (5) is electrically connected to the wind direction automatic following intelligent controller (6) and the driving mechanism in sequence.

2. The device for equalizing and reducing airflow resistance at the inlet of the secondary air duct of a power station boiler according to claim 1, characterized in that: The driving mechanism comprises a worm gear (4) sleeved on the support shaft (2) and a motor (7) arranged on the secondary layer air duct (10), and a worm (8) connected to the output end of the motor (7) is meshed with the worm gear (4).

3. The device for equalizing and reducing airflow resistance at the inlet of the secondary air duct of a power station boiler according to claim 1, characterized in that: The driving mechanism comprises a worm gear (4) sleeved on one of the support shafts (2) and a motor (7) arranged on the secondary layer air duct (10); a worm (8) connected to the output end of the motor (7) is meshed with the worm gear (4); a rotating pin (12) is provided in series at one end of the rectifier plate (9); one end of the rotating pin (12) is rotatably connected to the connecting rod (1) so that the rectifier plate (9) rotates synchronously.

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