Demisting and flow guiding assembly in flue of desulfurizing absorption tower

Abstract

The utility model discloses a demisting and guiding assembly in a flue of a desulfurizing absorption tower, which is characterized in that the desulfurizing absorption tower comprises the flue of the absorbing tower, a demister is arranged at an inlet of the flue of the absorbing tower, and a flue gas heater is arranged at an outlet of the flue of the absorbing tower; the demisting flow guide assembly comprises a horizontal supporting steel beam, a vertical supporting steel beam, a flow guide plate and a rectifying plate; the horizontal supporting steel beam is arranged in a vertical flue at an outlet of an absorption tower, and a plurality of inclined and parallel guide plates are arranged on the horizontal supporting steel beam; the vertical supporting steel beam is arranged in a horizontal flue at an outlet of an absorption tower, and a plurality of parallel rectifying plates are horizontally arranged on the vertical supporting steel beam. The flue gas heater is simple in overall structure and convenient to install, liquid in flue gas can be secondarily separated, the moisture content of the flue gas is reduced, the flue gas is evenly distributed, and the heat exchange efficiency of the flue gas heater is improved.

Description

Technical Field

[0001] The utility model relates to the field of desulfurization auxiliary equipment, in particular to a demisting and guiding component in the flue of a desulfurization absorption tower. Background Technique

[0002] The demister is a device used at the end of the wet desulfurization system to remove the liquid droplets entrained in the flue gas after wet desulfurization. The national industrial flue gas emission requirements are becoming increasingly stringent. Most thermal power plants adopt wet desulfurization systems. The demisting efficiency of the baffle demister used in the desulfurization system is low, resulting in a large amount of liquid droplets carried in the flue gas. The liquid droplets contain components such as calcium carbonate. The liquid droplets carried away from the demister are likely to accumulate and scale on the inner walls of the flue, chimney, and the fins of the flue gas heater. In addition, the large water content in the flue gas has a great impact on the service life of the chimney, a large amount is discharged into the air, and the water consumption of the power plant is large, affecting the water use economy. Content of the Utility Model

[0003] The purpose of the utility model is to provide a demisting and guiding component in the flue of a desulfurization absorption tower in order to solve the above technical problems existing in the existing baffle demister.

[0004] To achieve its purpose, the utility model adopts the following technical solutions:

[0005] A demisting and guiding component in the flue of a desulfurization absorption tower, the desulfurization absorption tower includes an absorption tower flue, a demister is provided at the inlet of the absorption tower flue, and a flue gas heater is provided at the outlet of the absorption tower flue; the demisting and guiding component includes a horizontal support steel beam, a vertical support steel beam, a deflector plate and a rectifying plate;

[0006] The horizontal support steel beam is arranged in the vertical flue at the outlet of the absorption tower, and a number of inclined and parallel deflector plates are provided on the horizontal support steel beam;

[0007] The vertical support steel beam is arranged in the horizontal flue at the outlet of the absorption tower, and a number of horizontally arranged and parallel rectifying plates are provided on the vertical support steel beam.

[0008] As a further improvement of the technical solution of the utility model, the included angle between the deflector plate and the horizontal support steel beam is 50°.

[0009] Furthermore, the deflector plate is welded to the horizontal support steel beam, and the rectifying plate is welded to the vertical support steel beam.

[0010] Furthermore, anti-corrosion layers are provided on the surfaces of the horizontal support steel beam and the vertical support steel beam, as well as at the welding joints between the horizontal support steel beam and the deflector plate and between the vertical support steel beam and the rectifying plate to prevent the acidic substances carried in the flue gas from corroding the surfaces of the steel beams and the welding joints.

[0011] Furthermore, the material of the deflector plate or the rectifying plate is heat-resistant and corrosion-resistant stainless steel or refractory ceramic.

[0012] Working principle of the utility model:

[0013] The flue gas flows through the demister in the absorption tower for preliminary demisting, and then forms a swirl through the guide vane for gas-liquid separation. The liquid contained in the flue gas adheres to the guide vane and flows into the absorption tower from the downstream of the guide vane. The flue gas flows through the rectifying plate, and the non-uniform flue gas is evenly distributed in the flue. When passing through the flue gas heater at the tail of the flue, uniform heat exchange occurs, improving the heat exchange efficiency.

[0014] The utility model has the following beneficial effects:

[0015] 1. The structure is simple and easy to use, and can be arranged according to the actual situation on site;

[0016] 2. By setting the guide vane, the direction of the flue gas flow is changed. While reducing the flue gas flow velocity, the droplets not removed by the demister can be demisted for the second time, reducing the moisture content of the flue gas;

[0017] 3. By setting the rectifying plate, the flue gas is evenly distributed, so that the flue gas can be evenly heated when passing through the flue gas heater at the tail of the flue, improving the heat exchange efficiency. Description of the drawings

[0018] Figure 1 is a schematic structural diagram of the utility model;

[0019] Figure 2 is Figure 1 a schematic structural diagram of the guide vane in;

[0020] Figure 3 is Figure 1 a schematic structural diagram of the rectifying plate in;

[0021] In the figure, 1 - guide vane, 2 - support steel beam, 3 - rectifying plate, 4 - demister, 5 - flue gas heater, 6 - vertical support steel beam, 7 - absorption tower flue. Detailed implementation manners

[0022] The following further explains and illustrates the utility model with reference to the drawings.

[0023] As Figures 1 - 3As shown in the figure, the present utility model provides a demisting and guiding component in the flue of a desulfurization absorption tower. The desulfurization absorption tower includes an absorption tower flue 7. A demister 4 is provided at the inlet of the absorption tower flue 7, and a flue gas heater 5 is provided at the outlet of the absorption tower flue 7. The demisting and guiding component includes a horizontal support steel beam 2, a vertical support steel beam 6, a deflector 1, and a rectifying plate 3. The two ends of the horizontal support steel beam 2 are welded to the inner wall of the vertical flue at the outlet of the absorption tower. On the horizontal support steel beam 2, three rows of mutually parallel deflectors 1 (adjusted according to the actual flue gas volume, etc.) are evenly distributed in the same plane. The inclination angle of the deflector 1 with respect to the horizontal support steel beam 2 is 50°. The two ends of the vertical support steel beam 6 are welded to the inner wall of the horizontal flue at the outlet of the absorption tower. On the vertical support steel beam 6, three rows of mutually parallel rectifying plates 3 (adjusted according to the actual flue gas volume, etc.) are evenly distributed in the same plane.

[0024] Among them, anti-corrosion layers are provided on the surfaces of the horizontal support steel beam 2 and the vertical support steel beam 6, as well as at the welding joints between the horizontal support steel beam 2 and the deflector 1 and between the vertical support steel beam 6 and the rectifying plate 3. The material of the deflector 1 or the rectifying plate 3 should be selected as high-temperature resistant and corrosion-resistant stainless steel, refractory ceramics, etc.

[0025] During use, the flue gas enters the interior of the absorption tower flue. After passing through the demister 4, the flue gas forms a swirl while changing its direction through the deflector 1, thereby separating the liquid droplets in the flue gas. The liquid droplets adhere to the surface of the deflector 1 and flow back into the absorption tower for reuse. The flue gas passes through the rectifying plate 3 to evenly distribute the non-uniform flue gas in the flue. Then, the flue gas enters the flue gas heater 5 to exchange heat with water.

[0026] In summary, the overall structure of the present utility model is simple and easy to install. It can separate the liquid in the flue gas twice, reduce the moisture content of the flue gas, and evenly distribute the flue gas, improving the heat exchange efficiency of the flue gas heater. This design provides a technical reference for the treatment method with low efficiency of the demister in power plants.

Claims

1. A demisting and guiding assembly in a flue of a desulfurization absorption tower, the desulfurization absorption tower comprising an absorption tower flue (7), a demisting device (4) being provided at the inlet of the absorption tower flue (7), and a flue gas heater (5) being provided at the outlet of the absorption tower flue (7), characterized in that: The demisting guide assembly comprises a horizontal supporting steel beam (2), a vertical supporting steel beam (6), a guide plate (1) and a rectifying plate (3); The horizontal support steel beam (2) is arranged in the vertical flue at the outlet of the absorption tower, and a plurality of inclined and mutually parallel guide plates (1) are arranged on the horizontal support steel beam (2); The vertical support steel beam (6) is arranged in the horizontal flue at the outlet of the absorption tower, and a plurality of mutually parallel rectifier plates (3) are horizontally arranged on the vertical support steel beam (6).

2. A demisting and guiding assembly in the flue of a desulfurization absorption tower as claimed in claim 1, characterized in that: The inclination angle between the guide plate (1) and the horizontal supporting steel beam (2) is 50°.

3. A demisting guide assembly in the flue of a desulfurization absorption tower as claimed in claim 1 or 2, characterized in that: The guide plate (1) is welded to the horizontal supporting steel beam (2), and the rectifying plate (3) is welded to the vertical supporting steel beam (6).

4. A demisting guide assembly in the flue of a desulfurization absorption tower as claimed in claim 3, characterized in that: The surfaces of the horizontal support steel beam (2) and the vertical support steel beam (6), as well as the welding points between the horizontal support steel beam (2) and the guide plate (1), and the welding points between the vertical support steel beam (6) and the rectifier plate (3) are all provided with an anti-corrosion layer.

5. A demisting and guiding assembly in the flue of a desulfurization absorption tower according to any one of claims 1, 2 and 4, characterized in that: The guide plate (1) or the rectifying plate (3) is made of high temperature resistant and corrosion resistant stainless steel or refractory ceramic.

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