Dehydrator capable of effectively reducing wet desulphurization chimney rain

Abstract

The utility model discloses a dehydrator capable of effectively reducing wet desulphurization chimney rain, and relates to the technical field of dehydrators, the dehydrator comprises a direct discharge chimney main body, a dehydrator main body and a central cylinder, the inner wall of the direct discharge chimney main body is welded with the dehydrator main body, and the inner side of the dehydrator main body is provided with the central cylinder. According to the dehydrator capable of effectively reducing the wet desulphurization chimney rain, liquid drops in flue gas transversely move towards the direct discharge chimney main body and the wall plate of the dehydrator main body in the rising process under the action of centrifugal force formed by the tangential speed, and the liquid drops in the flue gas collide with the wall plate and then are intercepted and collected into the drainage groove; the chimney rain phenomenon can be effectively reduced by utilizing the mechanical principle, through the shape of the arc-shaped flow guide plate, when smoke passes through the arc-shaped flow guide plate, liquid drops in part of the smoke can be continuously intercepted, and liquid drop entrainment caused by local high-speed airflow is reduced, so that the chimney rain risk is reduced, the gas-liquid separation efficiency is improved, and the chimney rain phenomenon is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of dehydrator technology, specifically a dehydrator that can effectively reduce chimney rain in wet desulfurization. Background Technology

[0002] Wet desulfurization is a process technology that achieves efficient desulfurization by chemically reacting an alkaline solution with sulfur dioxide (SO2) in flue gas. In wet desulfurization, high-temperature flue gas (typically 120-150℃) enters the absorption tower and comes into countercurrent contact with an alkaline slurry (such as limestone slurry). Under gas-liquid mass transfer, acidic gases such as SO2 are absorbed by the slurry and neutralized. Simultaneously, the sensible heat of the flue gas is rapidly cooled to the adiabatic saturation temperature (approximately 50-55℃) by the evaporation of the slurry. During this stage, the moisture content in the flue gas increases significantly due to slurry evaporation and mechanical entrainment, reaching 10%-15% (volume fraction). Subsequently, the flue gas carries a large number of micron-sized droplets (…). Particles with a diameter of 10-200μm enter the demister. After multi-stage baffle or cyclone separation, some ultrafine droplets (<20μm) are still not captured and enter the chimney with the saturated wet flue gas. Inside the chimney, due to the pressure reduction and the temperature difference with the environment (such as low temperature in winter), adiabatic expansion occurs, causing supersaturated water vapor to condense into liquid water droplets on the inner wall of the chimney and in the flue gas, eventually forming the "chimney rain" phenomenon. This process is particularly significant in biomass boiler scenarios, because the initial moisture content of its flue gas is as high as 20%-25%, and the supersaturation is further aggravated after desulfurization. The amount of condensed droplets generated increases by 30%-50% compared to coal-fired boilers. The generation of chimney rain is due to the dual effects of droplet entrainment and condensation.

[0003] Desulfurization tower droplet entrainment: During wet desulfurization, the sprayed slurry comes into intense contact with the flue gas. Tiny droplets (particle size > 15μm) that are not completely captured by the demister are discharged with the flue gas, forming "gypsum rain". Flue gas supersaturation condensation: After desulfurization, the flue gas temperature (50-60℃) is close to the dew point. After entering the chimney, it undergoes adiabatic expansion due to pressure reduction and ambient temperature difference (especially in winter). Water vapor condenses into droplets, which adhere to the inner wall of the chimney and fall to form "chimney rain". Secondary carry-over effect: High-speed flue gas (>12m / s) washes away the condensate accumulated on the inner wall of the chimney, re-entraining the droplets into the flue gas for discharge. Chimney rain causes water accumulation, corrosion and other hazards in the plant, making it difficult to clean the plant area and posing a risk of icing in winter. Utility Model Content

[0004] The purpose of this invention is to provide a dehydrator that can effectively reduce chimney rain in wet desulfurization, thereby solving the problem of severe chimney rain at the outlet of wet desulfurization as mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dehydrator that can effectively reduce chimney rain in wet desulfurization, comprising: a direct-discharge chimney body, a dehydrator body, and a central cylinder. The dehydrator body is welded to the inner wall of the direct-discharge chimney body. A central cylinder is arranged on the inner side of the dehydrator body. An inner cylinder cap is connected to the bottom of the central cylinder. Blades are connected between the outer side of the central cylinder and the inner wall of the dehydrator body. An inner ring plate is connected to the outer side of the blades. A drainage groove is formed on the bottom inner wall of the dehydrator body. A drainage connecting pipe is connected to the bottom of the drainage groove. A circular frame is arranged above the dehydrator body. A silicone protrusion is connected to the outer side of the circular frame. A support plate is welded to the bottom of the circular frame. An arc-shaped guide plate is welded to the top of the support plate. A threaded column is welded to the bottom of the support plate near the central cylinder. A silicone sealing sleeve is fitted on the outer side of the threaded column.

[0006] Preferably, the top of the central cylinder has a threaded hole that matches the size of the threaded column.

[0007] Preferably, the arc-shaped guide vanes are evenly distributed on the inner side of the circular frame, and there is a certain gap between adjacent arc-shaped guide vanes.

[0008] Preferably, the blades are arranged in sixteen groups at equal intervals on the inner side of the dewatering unit.

[0009] Preferably, the inner cap is conical in shape, and the outer diameter of the circular frame is slightly smaller than the inner diameter of the main body of the straight chimney.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: This dehydrator, which can effectively reduce chimney rain in wet desulfurization, will give the flue gas a tangential velocity after it passes through the blades on the inner side of the dehydrator body. Under the centrifugal force generated by the tangential velocity, the liquid droplets in the flue gas will move laterally towards the main body of the direct-discharge chimney and the wall plate of the dehydrator body during the upward process. After colliding with the wall plate, the liquid droplets in the flue gas will be intercepted and collected in the drainage groove. The liquid droplets accumulated in the drainage groove are guided into the ditch or desulfurization tower through the drainage connection pipe. The mechanical principle can effectively reduce the chimney rain phenomenon. When the flue gas passes through the dehydrator body, it will enter the gap between the arc-shaped guide plates inside the circular frame. Through the shape of the arc-shaped guide plates, when the flue gas passes through them, it can continue to intercept some of the liquid droplets in the flue gas and reduce the liquid droplet entrainment caused by the local high-speed airflow, thereby reducing the risk of chimney rain, improving the gas-liquid separation efficiency, and helping to further reduce the chimney rain phenomenon. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0012] Figure 2This is a three-dimensional cross-sectional structural diagram of the main body of the straight-exhaust chimney of this utility model;

[0013] Figure 3 This is a three-dimensional structural diagram of the main body of the dehydrator of this utility model;

[0014] Figure 4 This is a three-dimensional structural diagram of the circular frame of this utility model;

[0015] Figure 5 This is a three-dimensional structural diagram of the arc-shaped guide plate of this utility model.

[0016] In the diagram: 1. Main body of the straight chimney; 2. Main body of the dewatering unit; 3. Central cylinder; 4. Inner cylinder cap; 5. Blade; 6. Inner ring plate; 7. Drainage groove; 8. Drainage connecting pipe; 9. Circular frame; 10. Silicone protrusion; 11. Support plate; 12. Arc-shaped guide plate; 13. Threaded column; 14. Silicone sealing sleeve. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figures 1-3 It is understood that this utility model provides a technical solution: a dehydrator that can effectively reduce rain from wet desulfurization chimneys, comprising: a direct-discharge chimney body 1, a dehydrator body 2, and a central cylinder 3. The dehydrator body 2 is welded to the inner wall of the direct-discharge chimney body 1. The central cylinder 3 is arranged on the inner side of the dehydrator body 2. An inner cylinder cap 4 is connected to the bottom of the central cylinder 3. A blade 5 is connected between the outer side of the central cylinder 3 and the inner wall of the dehydrator body 2. An inner ring plate 6 is connected to the outer side of the blade 5. A drainage groove 7 is opened on the bottom inner wall of the dehydrator body 2. A drainage connecting pipe 8 is connected to the bottom of the drainage groove 7.

[0019] This dewatering device can effectively reduce chimney rain in wet desulfurization, and blade 5 can reduce the phenomenon of chimney rain.

[0020] exist Figures 1-5 In the middle: A circular frame 9 is provided above the main body 2 of the dehydrator. A silicone protrusion 10 is connected to the outside of the circular frame 9. A support plate 11 is welded to the bottom of the circular frame 9. An arc-shaped guide plate 12 is welded to the top of the support plate 11. A threaded column 13 is welded to the bottom of the support plate 11 near the center cylinder 3. A silicone sealing sleeve 14 is fitted on the outside of the threaded column 13.

[0021] The dehydrator, which can effectively reduce chimney rain in wet desulfurization, has an arc-shaped guide plate 12 that can further improve gas-liquid separation efficiency.

[0022] exist Figures 1-5 In the middle: the top of the central cylinder 3 is provided with a threaded hole that matches the size of the threaded column 13. The arc-shaped guide plates 12 are evenly distributed inside the circular frame 9, and there is a certain gap between adjacent arc-shaped guide plates 12. The blades 5 are evenly arranged in sixteen groups inside the dewatering body 2. The inner cylinder cap 4 is conical in shape. The outer diameter of the circular frame 9 is slightly smaller than the inner diameter of the straight chimney body 1.

[0023] This dewatering device, which can effectively reduce rain from the chimney of wet desulfurization, has a circular frame 9 that can be easily and conveniently installed and fixed to the central cylinder 3 via threaded posts 13.

[0024] In practice, the desulfurized wet flue gas is saturated or nearly saturated. While saturated wet flue gas may not contain water droplets, it is highly unstable and will condense when subjected to compression, expansion, cooling, or collision. Before welding the dehydrator body 2 to the inner wall of the direct-exhaust chimney body 1, the circular frame 9 can be moved above the dehydrator body 2, and the end of the threaded post 13 on the circular frame 9 can be inserted into the threaded hole at the top of the central cylinder 3. Rotating the circular frame 9 will cause the support plate 11 and the threaded post 13 to rotate. When the silicone sealing sleeve 14 slides to the maximum distance inside the central cylinder 3, the bottom of the silicone sealing sleeve 14 can be pressed against the top surface of the central cylinder 3. At this time, the circular frame 9 can be installed above the dehydrator body 2. The silicone sealing sleeve 14 can prevent the threaded column 13 from rusting and corroding. After the dehydrator body 2 is welded to the inner wall of the straight chimney body 1, the silicone protrusion 10 on the outside of the circular frame 9 will be squeezed and deformed against the inner wall of the straight chimney body 1, which can improve the overall stability of the circular frame 9. After fixing the circular frame 9 above the dehydrator body 2, the dehydrator body 2 can be welded to the inner wall of the straight chimney body 1.

[0025] See Figures 1-5It is known that when flue gas enters the interior of the main body 1 of the direct-exhaust chimney, after passing through the blades 5 on the inner side of the dehydrator body 2, the flue gas will gain a tangential velocity. Under the centrifugal force generated by the tangential velocity, the liquid droplets in the flue gas move laterally towards the wall panels of the main body 1 of the direct-exhaust chimney and the dehydrator body 2 during the upward process. After colliding with the wall panels, the liquid droplets in the flue gas are intercepted and collected in the drainage groove 7. The liquid droplets accumulated in the drainage groove 7 are guided into the ditch or desulfurization tower through the drainage connection pipe 8. Without energy consumption, the phenomenon of chimney rain can be effectively reduced by using mechanical principles. After the flue gas passes through the dehydrator body 2, it will enter the gap between the arc-shaped guide plates 12 inside the circular frame 9. Through the shape of the arc-shaped guide plates 12, when the flue gas passes through them, some of the liquid droplets in the flue gas can be intercepted, and the liquid droplet entrainment caused by the local high-speed airflow can be reduced, thereby reducing the risk of chimney rain, improving the gas-liquid separation efficiency, and helping to further reduce the phenomenon of chimney rain.

[0026] In summary, when using this dehydrator that can effectively reduce chimney rain in wet desulfurization, the circular frame 9 can be moved above the dehydrator body 2, and the end of the threaded post 13 on the circular frame 9 can be inserted into the threaded hole at the top of the central cylinder 3. When the circular frame 9 is rotated, the support plate 11 and the threaded post 13 can be rotated. When the flue gas passes through the dehydrator body 2, it will enter the gap between the arc-shaped guide plates 12 inside the circular frame 9. Through the shape of the arc-shaped guide plates 12, when the flue gas passes through them, some of the liquid droplets in the flue gas can be intercepted, and the liquid droplet entrainment caused by the local high-speed airflow can be reduced, thereby reducing the risk of chimney rain, improving the gas-liquid separation efficiency, and helping to further reduce the chimney rain phenomenon. The contents not described in detail in this description are existing technologies known to those skilled in the art.

[0027] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dehydrator that can effectively reduce chimney rain in wet desulfurization processes, including: The main body of the direct-discharge chimney (1), the main body of the dehydrator (2), and the central cylinder (3) are characterized in that: The inner wall of the main body (1) of the straight chimney is welded with a dehydrator body (2), and a central cylinder (3) is provided on the inner side of the dehydrator body (2). The bottom of the central cylinder (3) is connected to an inner cylinder cap (4). The outer side of the central cylinder (3) and the inner wall of the dehydrator body (2) are connected together by blades (5). The outer side of the blades (5) is connected to an inner ring plate (6). The bottom inner wall of the dehydrator body (2) is provided with a drainage groove (7). The bottom of the drainage groove (7) is connected to a drainage connecting pipe (8). A circular frame (9) is provided above the dehydrator body (2). The outer side of the circular frame (9) is connected to a silicone protrusion (10). The bottom of the circular frame (9) is welded with a support plate (11). The top of the support plate (11) is welded with an arc-shaped guide plate (12). The support plate (11) is welded to the bottom of the central cylinder (3) with a threaded column (13). The outer side of the threaded column (13) is fitted with a silicone sealing sleeve (14).

2. A dehydrator according to claim 1 that can effectively reduce chimney rain in wet desulfurization, characterized in that: The top of the central cylinder (3) is provided with a threaded hole that matches the size of the threaded column (13).

3. A dehydrator according to claim 1 that can effectively reduce chimney rain in wet desulfurization, characterized in that: The arc-shaped guide plates (12) are evenly distributed inside the circular frame (9), and there is a certain gap between adjacent arc-shaped guide plates (12).

4. A dehydrator according to claim 1 that can effectively reduce chimney rain in wet desulfurization, characterized in that: The blades (5) are arranged in sixteen groups at equal intervals on the inner side of the dehydrator body (2).

5. A dehydrator according to claim 3 that can effectively reduce chimney rain in wet desulfurization, characterized in that: The inner cap (4) is conical in shape, and the outer diameter of the circular frame (9) is slightly smaller than the inner diameter of the main body (1) of the straight chimney.

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