Single-tower double-equal-flow desulfurization device for high-sulfur flue gas

Abstract

The application provides a high-sulfur flue gas single-tower double-equal-flow desulfurization device, which comprises a desulfurization tower, an inlet flue gas port, a double-equal-flow device, a spraying layer, a demister and an outlet flue gas port, the double-equal-flow device is arranged above the inlet flue gas port, the double-equal-flow device comprises a first equal-flow plate and a second equal-flow plate, the first equal-flow plate is arranged below the second equal-flow plate, a plurality of equal-flow holes are arranged on the first equal-flow plate, the second equal-flow plate is composed of a plurality of equal-flow pipes, the spraying layer is fixedly arranged above the double-equal-flow device, the spraying layer is composed of a plurality of spraying nets, spraying holes are arranged on the spraying nets, and the demister is arranged between the spraying layer and the outlet flue gas port, the flue gas entering the desulfurization tower is subjected to equal flow through the first equal-flow plate and the second equal-flow plate, and the flow rate of the flue gas is reduced, so that the spraying layer is protected, the service life of the spraying layer is prolonged, the flue gas is fully filled in the desulfurization tower, waste of spraying liquid at the edge is avoided, and the spraying efficiency of the spraying layer is improved.

Description

Technical Field

[0001] This invention relates to the field of desulfurization towers, and more particularly to a dual-flow desulfurization tower for high-sulfur coal flue gas. Background Technology

[0002] High-sulfur coal is often used in industrial production. However, the production of high-sulfur coal easily generates various flue gases with high sulfur content. If these gases are directly released into the air, they will cause serious pollution and damage. Therefore, in industrial production, flue gas is generally desulfurized through a desulfurization tower before being released into the atmosphere. Conventional desulfurization towers generally use a single-tower double-circulation or double-tower double-circulation method to desulfurize high-sulfur flue gas. However, these methods have disadvantages. The double-tower double-circulation method has high energy consumption, a large footprint, and high cost. In the single-tower double-circulation process, the desulfurization tower has more equipment due to the double circulation. The flue gas directly impacts the spray layer, which not only easily damages the spray layer and complicates installation and maintenance, but also prevents the edge spray layer from fully contacting the flue gas, resulting in unnecessary waste of spray liquid and excessively high operating costs. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a single-tower dual-flow desulfurization device for high-sulfur flue gas.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a single-tower dual-flow desulfurization device for high-sulfur flue gas, comprising a desulfurization tower, wherein the desulfurization tower is provided with a flue gas inlet, a dual-flow device, a spray layer, a demister and a flue gas outlet;

[0005] The flue gas inlet is located at the bottom of the desulfurization tower, and the flue gas inlet is sealed to the exhaust port of the external fan.

[0006] The dual flow equalization device is disposed above the smoke inlet. The dual flow equalization device includes a first flow equalization plate and a second flow equalization plate. The first flow equalization plate is disposed below the second flow equalization plate. A plurality of flow equalization holes are disposed through the first flow equalization plate. The second flow equalization plate is composed of a plurality of flow equalization tubes. The inner diameter of the flow equalization tubes is equal to the inner diameter of the flow equalization holes.

[0007] The spray layer is fixedly installed above the dual flow equalization device. The spray layer is sealed to the external spray liquid storage tank. The spray layer is composed of several layers of spray nets. Spray holes are provided on the spray nets and distributed at the upper and lower ends of the spray nets.

[0008] The demister is positioned above the spray layer and between the smoke outlet, and the distance between the demister and the uppermost spray layer is greater than the distance from which the spray liquid is sprayed from the spray hole.

[0009] Preferably, the flow equalization holes around the first flow equalization plate are inclined through the first flow equalization plate, and the inclination direction of the flow equalization holes is inclined from the outer edge of the upper surface of the first flow equalization plate to the center of the lower surface. The flow equalization holes at the center of the first flow equalization plate are vertically connected.

[0010] Preferably, the cross-sectional area of ​​the vertically arranged flow equalization hole is smaller than the area of ​​the second flow equalization plate.

[0011] Preferably, the cross-sectional area of ​​the second flow equalization plate is adapted to the cross-sectional area of ​​the desulfurization tower.

[0012] Preferably, the spray net and the spray holes are connected by a spray pipe, the spray pipe and the spray net are arranged in a cross shape, and the horizontal mesh of the spray net is connected to the spray pipe. The spray pipe has a Tesla valve structure inside. Taking the connection between the spray pipe and the horizontal mesh of the spray net as the boundary, the upward pipe of the spray pipe is the flow path, and the downward pipe of the spray pipe is the reverse flow path.

[0013] Preferably, the connection point between the spray pipe and the spray net is close to the lower end of the spray pipe, and the distance from the connection point to the lower end of the spray pipe is less than the distance from the connection point to the upper end of the spray pipe.

[0014] Preferably, the spray holes are distributed on a frustum-shaped spray platform, the bottom surface of the spray platform is connected to the spray pipe, the inner diameter of the spray holes gradually decreases from the inside to the outside, and the spray holes are evenly distributed on the spray platform.

[0015] Preferably, a filter screen is provided between the first flow equalization plate and the flue gas inlet. The filter screen is a conical filter screen, and the conical edge of the filter screen is fixed on the inner wall of the desulfurization tower. A gap is left between the conical tip of the filter screen and the first flow equalization plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: by equalizing the flow of flue gas entering the desulfurization tower through the first flow equalization plate and the second flow equalization plate, the flow rate of the flue gas is reduced, which not only protects the spray layer and improves the service life of the spray layer, but also allows the flue gas to fully fill the interior of the desulfurization tower, avoids waste of spray liquid at the edge, and increases the spraying efficiency of the spray layer. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the high-sulfur flue gas single-tower dual-flow desulfurization device of the present invention;

[0018] Figure 2 This is a schematic diagram of the spray net of the single-tower dual-flow desulfurization device for high-sulfur flue gas according to the present invention;

[0019] Figure 3This is a schematic diagram of the spray pipe of the single-tower dual-flow desulfurization device for high-sulfur flue gas according to the present invention. Implementation

[0020] To provide a further understanding of the purpose, structure, features, and functions of the present invention, detailed descriptions are provided below with reference to specific embodiments.

[0021] Please refer to the reference. Figure 1 , Figure 2 and Figure 3 The present invention provides a single-tower dual-flow desulfurization device for high-sulfur flue gas, including a desulfurization tower, which is provided with a flue gas inlet 1, a dual-flow device 2, a spray layer 3, a demister 4 and a flue gas outlet 5.

[0022] The flue gas inlet 1 is located at the bottom of the desulfurization tower, and the flue gas inlet 1 is sealed to the exhaust port of the external fan;

[0023] The dual flow equalization device 2 is disposed above the smoke inlet 1. The dual flow equalization device 2 includes a first flow equalization plate 21 and a second flow equalization plate 22. The first flow equalization plate 21 is disposed below the second flow equalization plate 22. A plurality of flow equalization holes 23 are disposed through the first flow equalization plate 21. The second flow equalization plate 22 is composed of a plurality of flow equalization tubes. The inner diameter of the flow equalization tubes is equal to the inner diameter of the flow equalization holes 23.

[0024] The spray layer 3 is fixedly installed above the double flow equalization device 2. The spray layer 3 seals the external spray liquid storage tank. The spray layer 3 is composed of several layers of spray nets 31. Spray holes 32 are provided on the spray nets 31 and are distributed at the upper and lower ends of the spray nets 31.

[0025] The demister 4 is positioned above the spray layer 3 and between the smoke outlet 5. The distance between the demister 4 and the uppermost spray layer 3 is greater than the distance from which the spray liquid is sprayed from the spray hole 32.

[0026] The dual flow equalization device 2 installed above the flue gas inlet 1 can effectively equalize the flow of sulfur-containing flue gas entering the desulfurization tower. After the flue gas passes through the dual flow equalization device 2, the flow velocity is reduced and the entire upper part of the desulfurization tower is filled. This not only protects the spray layer 3 from damage caused by the flue gas impact over time, reducing maintenance and replacement costs, but also reduces the flow velocity of the flue gas, allowing the flue gas to be sprayed in the spray layer 3 for a longer time, thus improving the spray desulfurization effect.

[0027] Preferably, the flow equalization holes 23 around the first flow equalization plate 21 are inclined through the first flow equalization plate 21, and the inclination direction of the flow equalization holes 23 is inclined from the outer edge of the upper surface of the first flow equalization plate 21 to the center of the lower surface. The flow equalization holes 23 at the center of the first flow equalization plate 21 are vertically connected.

[0028] The flow equalization holes 23 around the first flow equalization plate 21 are inclined through the first flow equalization plate 21, and the inclination direction of the flow equalization holes 23 is inclined from the outer edge of the upper surface of the first flow equalization plate 21 to the center of the lower surface. This allows the flue gas entering the first flow equalization plate 21 to flow evenly from the center of the first flow equalization plate 21 to the edge. This avoids the situation where the flue gas after passing through the first flow equalization plate 21 cannot enter the edge of the second flow equalization plate 22, resulting in the sulfur-containing flue gas at the edge of the spray layer 3 having a lower content than at the center, wasting the spray liquid at the edge of the spray layer 3, and thus improving the desulfurization efficiency.

[0029] Preferably, the cross-sectional area of ​​the vertically arranged flow equalization hole 23 is smaller than the cross-sectional area of ​​the second flow equalization plate 22.

[0030] The cross-sectional area of ​​the second flow equalization plate 22 is larger than that of the vertically arranged flow equalization hole 23, which ensures that after the first flow equalization plate 21 expands the flue gas volume, the second flow equalization plate 22 can effectively deliver the expanded flue gas into the spray layer 3 without compressing the volume, thereby improving the desulfurization efficiency.

[0031] Preferably, the cross-sectional area of ​​the second flow equalization plate 22 is adapted to the cross-sectional area of ​​the desulfurization tower.

[0032] The second flow equalization plate 22, whose cross-sectional area is adapted to that of the desulfurization tower, can ensure that the flue gas after the first flow equalization plate 21 is received to the maximum extent. Under the premise that the spray layer 3 can spray all the flue gas, the spray layer 3 at the edge of the desulfurization tower must also carry out spraying work. The flue gas is evenly distributed into the spray space above the entire double flow equalization device 2, so as not to waste the spray liquid sprayed from the edge of the spray layer 3.

[0033] Preferably, the spray net 31 and the spray hole 32 are connected by a spray pipe 33. The spray pipe 33 and the spray net 31 are arranged in a cross shape, and the horizontal network of the spray net 31 is connected to the vertical spray pipe 33. The spray pipe 33 has a Tesla valve structure inside. Taking the connection between the vertical spray pipe 33 and the horizontal network of the spray net 31 as the boundary, the upward pipe of the spray pipe 33 is the flow path, and the downward pipe of the spray pipe 33 is the reverse flow path.

[0034] The Tesla valve-type spray pipe 33 is a co-current spray pipe, which can effectively accelerate the spray liquid between the spray pipe 33 and the upper spray hole 32. The spray liquid sprayed upward moves in the same direction as the flue gas for a certain distance and then falls due to gravity. Compared with conventional direct downward spraying, the spray liquid has a longer contact time with the flue gas, which improves the desulfurization efficiency. The spray pipe 33 to the lower spray hole 32 is a countercurrent spray pipe. Due to the characteristics of the Tesla valve structure, the spray liquid at the lower end of the spray pipe 33 will be sprayed out at a slower speed, which can further reduce the speed of the flue gas, increase the residence time of the flue gas in the spray layer 3, and improve the desulfurization efficiency.

[0035] Preferably, the connection between the spray pipe 33 and the spray net 31 is close to the lower end of the spray pipe 33, and the distance from the connection to the lower end of the spray pipe 33 is less than the distance from the connection to the upper end of the spray pipe 33.

[0036] Due to the characteristics of the Tesla valve, the connection between the spray pipe 33 and the spray net 31 needs to be close to the lower end of the spray pipe 33 to prevent the spray liquid from being slowed down too much by the characteristics of the valve body and making it difficult to spray out from the spray hole 32 at the lower end.

[0037] Preferably, the spray holes 32 are distributed on the frustum-shaped spray table 34, the bottom surface of the spray table 34 is connected to the spray pipe 33, the inner diameter of the spray holes 32 gradually decreases from the inside to the outside, and the spray holes 32 are evenly distributed on the spray table 34.

[0038] The spray holes 32, whose inner diameter gradually decreases from the inside to the outside, can increase the speed at which the spray liquid is sprayed out of the spray holes 32, which facilitates vaporization and allows the spray liquid to come into more full contact with the flue gas, thereby improving the desulfurization efficiency.

[0039] Preferably, a filter screen is provided between the first flow equalization plate 21 and the flue gas inlet 1. The filter screen is a conical filter screen, and the conical edge of the filter screen is fixed on the inner wall of the desulfurization tower. A gap is left between the conical tip of the filter screen and the first flow equalization plate 21.

[0040] The filter screen is used to filter particulate matter in sulfur-containing flue gas, preventing the particulate matter in the sulfur-containing flue gas from impacting the lower end of the first flow equalization plate 21 and causing wear to the first flow equalization plate 21, thereby improving the service life of the first flow equalization plate 21.

[0041] As described above, in actual use, sulfur-containing flue gas enters from the inlet 1. After the particulate matter in the flue gas is filtered out by the filter screen, the flue gas enters the first flow equalization plate 21 in the dual flow equalization device 2. After passing through the inclined flow equalization hole 23, the flue gas slows down and fills the desulfurization tower space between the first flow equalization plate 21 and the second flow equalization plate 22. It then enters the spray layer 3 along the second flow equalization plate 22, which is adapted to the cross-sectional area of ​​the desulfurization tower. The spray liquid sprayed from the upper end of the spray pipe 33 moves together with the flue gas. After a period of time, due to the influence of gravity, it falls back into the flue gas that continues to move upward. At the same time, the spray liquid dripping from the lower end of the spray pipe 33 replenishes the spray liquid moving downward. It can also further reduce the upward speed of the flue gas and increase the residence time of the flue gas in the desulfurization tower. After being sprayed by multiple layers of spray layer 3, the flue gas is discharged from the outlet 5 through the demister 4.

[0042] The present invention has been described in the above-described embodiments; however, these embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the present invention. Conversely, any modifications and refinements made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A single-tower dual-flow desulfurization device for high-sulfur flue gas, comprising a desulfurization tower, characterized in that: The desulfurization tower is equipped with a flue gas inlet (1), a dual flow equalization device (2), a spray layer (3), a demister (4), and a flue gas outlet (5). The flue gas inlet (1) is located at the bottom of the desulfurization tower, and the flue gas inlet (1) is sealed to the exhaust port of the external fan. The dual flow equalization device (2) is disposed above the smoke inlet (1). The dual flow equalization device (2) includes a first flow equalization plate (21) and a second flow equalization plate (22). The first flow equalization plate (21) is disposed below the second flow equalization plate (22). A plurality of flow equalization holes (23) are disposed through the first flow equalization plate (21). The second flow equalization plate (22) is composed of a plurality of flow equalization tubes. The inner diameter of the flow equalization tubes is equal to the inner diameter of the flow equalization holes (23). The flow equalization holes (23) around the first flow equalization plate (21) are inclined through the first flow equalization plate (21). The inclination direction of the flow equalization holes (23) is inclined from the outer edge of the upper surface of the first flow equalization plate (21) to the center of the lower surface. The flow equalization holes (23) at the center of the first flow equalization plate (21) are vertically disposed. The spray layer (3) is fixedly installed above the dual flow equalization device (2). The spray layer (3) seals the external spray liquid storage tank. The spray layer (3) is composed of several layers of spray nets (31). Spray holes (32) are provided on the spray nets (31). The spray holes (32) are distributed at the upper and lower ends of the spray nets (31). The spray nets (31) and the spray holes (32) are connected by spray pipes (33). The spray pipe (33) and the spray net (31) are connected in a cross shape, and the horizontal network of the spray net (31) is connected to the spray pipe (33). The spray pipe (33) has a Tesla valve structure inside. Taking the connection point of the horizontal network of the spray pipe (33) and the spray net (31) as the boundary, the upward pipe of the spray pipe (33) is the flow path, and the downward pipe of the spray pipe (33) is the reverse flow path. The demister (4) is positioned above the spray layer (3) and between the smoke outlet (5). The distance between the demister (4) and the uppermost spray layer (3) is greater than the distance from which the spray liquid is sprayed from the spray hole (32).

2. The high-sulfur flue gas single-tower dual-flow desulfurization device as described in claim 1, characterized in that... The cross-sectional area of ​​the vertically arranged flow equalization hole (23) is smaller than the area of ​​the second flow equalization plate (22).

3. The high-sulfur flue gas single-tower dual-flow desulfurization device as described in claim 2, characterized in that: The cross-sectional area of ​​the second flow equalization plate (22) is adapted to the cross-sectional area of ​​the desulfurization tower.

4. The high-sulfur flue gas single-tower dual-flow desulfurization device as described in claim 1, characterized in that: The connection point between the spray pipe (33) and the spray net (31) is close to the lower end of the spray pipe (33), and the distance from the connection point to the lower end of the spray pipe (33) is less than the distance from the connection point to the upper end of the spray pipe (33).

5. The high-sulfur flue gas single-tower dual-flow desulfurization device as described in claim 1, characterized in that: The spray holes (32) are distributed on the frustum-shaped spray platform (34). The bottom surface of the spray platform (34) is connected to the spray pipe (33). The inner diameter of the spray holes (32) gradually decreases from the inside to the outside. The spray holes (32) are evenly distributed on the spray platform (34).

6. The high-sulfur flue gas single-tower dual-flow desulfurization device as described in claim 1, characterized in that: A filter screen is provided between the first flow equalization plate (21) and the flue gas inlet (1). The filter screen is a conical filter screen. The conical edge of the filter screen is fixed on the inner wall of the desulfurization tower. A gap is left between the conical tip of the filter screen and the first flow equalization plate (21).

Images