Near-wall air device for boiler wing wall

Abstract

The utility model provides a near-wall air device for a boiler wing wall, the near-wall air device comprises a mounting assembly and an air inlet device, the mounting assembly is arranged on the outer wall of a wing wall pressure-bearing heated area, the air inlet device is connected to the mounting assembly, and an air outlet of the air inlet device is used for communicating with an opening of the outer wall of the wing wall pressure-bearing heated area so as to blow air into the wing wall. The near-wall air device is installed on the outer wall of a wing wall pressure-bearing heated area, an air outlet of the near-wall air device is aligned with an opening of the outer wall, air is blown into the wing wall, an air film is formed in the wing wall area, and the purpose of relieving high-temperature corrosion is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal power generation, and in particular relates to a near-wall wind device for a boiler wing wall. Background Art

[0002] my country's emission requirements for thermal power generation companies are gradually aligned with the world. Low-nitrogen combustion systems play an important role in reducing nitrogen oxide emissions. However, the current low-nitrogen combustion technology will lead to lack of oxygen in the main combustion zone, which will cause sulfate and SO3 to corrode the pressure-bearing heating surface at high temperatures, shorten the service life of the equipment, and even cause safety accidents. Conventional pressure-bearing heating surface anti-corrosion spraying can also effectively resist high-temperature corrosion, and anti-corrosion spraying is also a protective measure that requires long-term maintenance, especially for boilers burning coal with high ash content. Regular maintenance and repair can effectively maintain the anti-corrosion ability of the pressure-bearing heating surface, especially the intersection of the guard belt and the pressure-bearing heating surface pipe is not easy to overlap, resulting in increased boiler operating costs. Utility Model Content

[0003] The technical problem solved by the utility model is: how to slow down the high temperature corrosion of the boiler wing wall area.

[0004] The present application provides a near-wall wind device for a boiler wing wall, the near-wall wind device comprising a mounting assembly and an air inlet device, the mounting assembly being arranged on the outer wall of the pressure-bearing and heating area of ​​the wing wall, the air inlet device being connected to the mounting assembly, and the air outlet of the air inlet device being used to connect to the opening of the outer wall of the pressure-bearing and heating area of ​​the wing wall to blow air into the interior of the wing wall.

[0005] Optionally, the installation assembly includes a plurality of heating surface letting tubes arranged side by side, the heating surface letting tubes are partially bent to form a letting structure, and the air inlet device is inserted through the letting structure.

[0006] Optionally, the air inlet device includes an air outlet assembly and a power wind source connecting pipe, the air outlet assembly is connected to the mounting assembly, and the power wind source connecting pipe is connected to the air outlet assembly.

[0007] Optionally, the power wind source connecting pipeline is provided with an air volume adjustment device.

[0008] Optionally, the air outlet assembly is provided with adjustable blades.

[0009] Optionally, the number of the near-wall wind devices is at least two, and the near-wall wind devices are arranged at intervals.

[0010] Optionally, the near-wall wind devices are distributed alternately along the vertical direction of the outer wall of the pressure-bearing and heating area of ​​the wing wall.

[0011] The utility model discloses a near-wall wind device for a boiler wing wall, which has the following technical effects:

[0012] The near-wall wind device is installed on the outer wall of the pressure-bearing and heated area of ​​the wing wall. The air outlet of the near-wall wind device is aimed at the opening of the outer wall, and air is blown into the inside of the wing wall to form an air film in the wing wall area to achieve the purpose of alleviating high-temperature corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of a near-wall wind device for a boiler wing wall according to one or more embodiments.

[0014] The corresponding relationship between the reference numerals and the component names is as follows:

[0015] 10-installation assembly, 11-heating surface pipe, 20-air inlet device, 21-air outlet assembly, 22-power air source connection pipe. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0017] Before describing in detail the various embodiments of the present scheme, the technical concept of the present scheme is briefly described first: At present, an anti-corrosion coating is usually sprayed on the pressure-bearing and heated surface to resist high-temperature corrosion, but the anti-corrosion coating itself also needs to be maintained, which leads to high costs for boiler operation. To this end, the near-wall wind device for the boiler wing wall provided in the present application is provided on the outer wall of the pressure-bearing and heated area of ​​the wing wall. The air outlet of the near-wall wind device is aligned with the opening of the outer wall, and air is blown into the inside of the wing wall to form an air film in the wing wall area to achieve the purpose of slowing down high-temperature corrosion. The specific principle of the near-wall wind device for the boiler wing wall of the present application is described below in combination with more embodiments.

[0018] Specifically, Figure 1 As shown, the near-wall wind device for the boiler wing wall of the first embodiment includes a mounting assembly 10 and an air inlet device 20. The mounting assembly 10 is arranged on the outer wall of the pressure-bearing and heating area of ​​the wing wall (not shown in the figure), and the air inlet device 20 is connected to the mounting assembly, and the air outlet of the air inlet device 20 is used to connect to the opening of the outer wall of the pressure-bearing and heating area of ​​the wing wall to blow air into the inside of the wing wall. While the main burner area is still in an oxygen-deficient combustion state, the wing wall area has a higher local oxygen content, thereby realizing the separation of the high-temperature flue gas area and the high-reducing atmosphere area, improving the local reducing atmosphere and thus slowing down high-temperature corrosion.

[0019] In one or more embodiments, the number of near-wall wind devices is at least two, and each near-wall wind device is arranged at intervals. By arranging multiple near-wall wind devices, high-temperature corrosion of the wing wall can be mitigated from multiple locations, and large-area ash blocks can also be prevented from forming on the inner wall of the wing wall. After the large-area ash blocks fall, they may directly extinguish the flames and cause the boiler to flame out. In other words, the near-wall wind device creates a partial oxygen-rich area near the side pressure-bearing heating surface when the burner area is overall oxygen-deficient, while curbing sulfide corrosion, oxidizing the iron in the fly ash, reducing the actual melting point of the fly ash, and reducing the adhesion of the ash to the pressure-bearing heating surface, thereby reducing sulfate corrosion and SO3 corrosion.

[0020] Exemplarily, the near-wall wind devices are staggered and distributed along the vertical direction of the outer wall of the wing wall pressure-bearing and heating area to avoid the formation of large-area ash blocks to the greatest extent.

[0021] Furthermore, the installation assembly 10 includes a plurality of heating surface letting tubes 11 arranged side by side, the heating surface letting tubes 11 are partially bent to form an escape structure, and the air inlet device 20 is inserted through the escape structure.

[0022] In one or more embodiments, the air inlet device 20 includes an air outlet assembly 21 and a power wind source connecting pipe 22, the air outlet assembly 21 is connected to the mounting assembly 10, and the power wind source connecting pipe 22 is connected to the air outlet assembly 21, wherein the air outlet of the air outlet assembly 21 is connected to the opening of the outer wall of the pressure-bearing and heated area of ​​the wing wall, and the power wind source connecting pipe 22 is connected to an external power wind source to blow air into the inside of the wing wall to form an air film.

[0023] Exemplarily, the air outlet assembly 21 is provided with adjustable blades, the angle of which can be adjusted so that the wind near the wall can be directed out through the air outlet assembly and can blow toward the wing wall in a set direction without damaging the pressure-bearing heating surface tubes of the wing wall.

[0024] Exemplarily, the power wind source connecting duct 22 is provided with an air volume adjustment device, which can control the air volume of the near-wall wind as required. For example, the air volume adjustment device can adopt a circular damper, and the air volume of the near-wall wind can be adjusted by adjusting the opening of the circular damper.

[0025] The near-wall wind device for the boiler wing wall provided in this embodiment is installed on the outer wall of the pressure-bearing and heating area of ​​the wing wall. The air outlet of the near-wall wind device is aligned with the opening of the outer wall to blow air into the inside of the wing wall, forming an air film in the wing wall area to achieve the purpose of slowing down high-temperature corrosion.

[0026] The specific implementation methods of the present invention are described in detail above. Although some embodiments have been shown and described, those skilled in the art should understand that these embodiments can be modified and improved without departing from the principle and spirit of the present invention whose scope is defined by the claims and their equivalents. These modifications and improvements should also be within the scope of protection of the present invention.

Claims

1. A near-wall wind device for a boiler wing wall, characterized in that: The near-wall wind device includes a mounting assembly and an air inlet device. The mounting assembly is arranged on the outer wall of the pressure-bearing and heating area of ​​the wing wall. The air inlet device is connected to the mounting assembly, and the air outlet of the air inlet device is used to connect to the opening of the outer wall of the pressure-bearing and heating area of ​​the wing wall to blow air into the inside of the wing wall.

2. The near-wall wind device for boiler wing wall according to claim 1, characterized in that: The installation assembly comprises a plurality of heating surface letting tubes arranged side by side, the heating surface letting tubes are partially bent to form a letting structure, and the air inlet device is arranged through the letting structure.

3. The near-wall wind device for boiler wing wall according to claim 1, characterized in that: The air inlet device comprises an air outlet assembly and a power wind source connecting pipeline, the air outlet assembly is connected to the mounting assembly, and the power wind source connecting pipeline is communicated with the air outlet assembly.

4. The near-wall wind device for boiler wing wall according to claim 3, characterized in that: The power wind source connecting pipeline is provided with an air volume adjusting device.

5. The near-wall wind device for boiler wing wall according to claim 3, characterized in that: The air outlet assembly is provided with adjustable blades.

6. The near-wall wind device for boiler wing wall according to any one of claims 1 to 5, characterized in that: The number of the near-wall wind devices is at least two, and the near-wall wind devices are arranged at intervals.

7. The near-wall wind device for boiler wing wall according to claim 6, characterized in that: The near-wall wind devices are distributed alternately along the vertical direction of the outer wall of the pressure-bearing and heating area of ​​the wing wall.

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