Efficient desulfurization spray tower for acid-containing tail gas

Abstract

The utility model relates to an acid-containing tail gas efficient desulfurization spray tower which comprises a tower body, a plurality of partition plates, a gas inlet pipe and a spray assembly, the top of the tower body is provided with a gas exhaust end, the bottom of the tower body is provided with a liquid drainage end, the partition plates are sequentially arranged in the tower body in the vertical direction, the top of a serpentine channel communicates with the gas exhaust end, and the partition plates are each provided with a plurality of holes. One end of the gas inlet pipe is externally connected with tail gas, the other end of the gas inlet pipe is communicated with the bottom of the S-shaped channel so that the tail gas can flow upwards along the S-shaped channel, the spraying assembly is arranged at the top of the tower body, and the spraying assembly is provided with a spraying end right opposite to the uppermost partition plate. The spraying end of the spraying assembly directly faces the uppermost partition plate to spray spraying liquid, part of the spraying liquid penetrates through the through holes of the partition plates and forms a plurality of spraying water curtains in the S-shaped channel, the rest of the spraying liquid flows downwards along the S-shaped channel, and tail gas to be desulfurized can make contact with the spraying liquid below the tail gas in the process of penetrating through the spraying water curtains. And the contact area of the tail gas and the spraying liquid is effectively increased.

Description

Technical Field

[0001] The present application relates to the technical field of tail gas treatment, and in particular to a high-efficiency desulfurization spray tower for acid-containing tail gas. Background Art

[0002] Tail gases from acid production usually contain harmful substances such as sulfur dioxide and need to be desulfurized before being discharged. Currently, most desulfurization treatments are carried out by spraying ammonia / limestone slurry in a spray tower.

[0003] Chinese patent CN220900022U discloses a boiler exhaust desulfurization and denitrification spray tower. By combining an inclined air inlet channel with a spirally rising gas transmission channel, the spiral upward movement direction of the flue gas is controlled. The spray pipe on the inner wall of the gas transmission channel is combined with a catalyst reactor to increase the reverse contact area between the flue gas and the solution, thereby achieving better catalytic decomposition, desulfurization and denitrification effects. Wastewater can more easily carry sediments away from the channel along the inclined inner wall and collect them at the bottom of the inner wall of the spray tower.

[0004] However, desulfurizers such as ammonia water or limestone slurry gather into clumps and flow down the intake channel, with a limited contact area with the exhaust gas. Therefore, the length of the intake channel needs to be extended to ensure the desulfurization effect, but this also reduces the desulfurization efficiency. Summary of the Invention

[0005] In view of this, it is necessary to provide an efficient desulfurization spray tower for acid tail gas to solve the problem that the existing spray tower desulfurization needs to extend the length of the air inlet channel to ensure the desulfurization effect, but also reduces the desulfurization efficiency.

[0006] The present application provides a high-efficiency desulfurization spray tower for acid-containing tail gas, comprising a tower body, multiple partitions, an air inlet pipe and a spray assembly, wherein the top of the tower body is provided with an exhaust end and the bottom is provided with a liquid discharge end, multiple partitions are arranged in sequence in the tower body along the vertical direction to separate the interior of the tower body into a serpentine channel, the top of the serpentine channel is connected to the exhaust end, multiple partitions are provided with multiple holes, one end of the air inlet pipe is connected to the tail gas, and the other end is connected to the bottom of the serpentine channel for the tail gas to flow upward along the serpentine channel, the spray assembly is arranged at the top of the tower body, and the spray assembly has a spray end arranged facing the uppermost partition, part of the spray liquid passes through the through holes of the multiple partitions and forms multiple spray water curtains in the serpentine channel, and the remaining spray liquid flows downward along the serpentine channel.

[0007] Furthermore, the plurality of partitions are staggeredly arranged on the inner walls on both sides of the tower body in a vertical direction, and the plurality of partitions are all arranged horizontally.

[0008] Furthermore, the air inlet pipe is connected to the side wall of the bottom of the tower body, and the air intake direction of the air inlet pipe is directed to the gap between the partition above it and the inner wall of the tower body.

[0009] Furthermore, the acid-containing tail gas high-efficiency desulfurization spray tower also includes a plurality of nozzles installed on the lowermost partition, and the plurality of nozzles are arranged at the bottom of the partition and are respectively connected to the plurality of through holes.

[0010] Furthermore, the acid tail gas high-efficiency desulfurization spray tower also includes a water retaining frame installed on the lowest partition, and the water retaining frame is connected to the outer edge of the top of the partition to form a water retaining cavity connecting multiple through holes.

[0011] Furthermore, the acid-containing tail gas high-efficiency desulfurization spray tower also includes a drain valve installed in the drain end for opening and closing the drain end.

[0012] Furthermore, the high-efficiency desulfurization spray tower for acidic tail gas also includes a high-level sensor and a low-level sensor installed in the tower body, the high-level sensor is located below the air intake pipe, and the high-level sensor, the low-level sensor and the discharge end are arranged in sequence in a vertical downward direction.

[0013] Furthermore, the acid-containing tail gas high-efficiency desulfurization spray tower also includes a buffer box installed on the side wall of the tower body, and the buffer cavity of the buffer box is connected to the serpentine channel.

[0014] Furthermore, the inner bottom wall of the buffer box is arranged to be inclined downward in a direction close to the serpentine channel.

[0015] Furthermore, the spray assembly includes multiple water distribution rings, a cross connecting frame, a water inlet pipe and multiple spray heads. The multiple water distribution rings are coaxially arranged and the diameters increase successively from the inside to the outside. The tops of the multiple water distribution rings are fixedly connected to the inner wall of the tower body via the cross connecting frame. One end of the water inlet pipe is connected to the spray liquid, and the other end of the water inlet pipe is connected to the multiple water distribution rings. The bottom of each water distribution ring is connected to multiple spray heads evenly arranged along its circumferential direction.

[0016] Compared with the prior art, the present application provides a high-efficiency desulfurization spray tower for acidic tail gas. The tail gas to be desulfurized enters from the bottom of the tower body, flows upward along the serpentine channel, and is discharged from the exhaust end. During the above flow process, the spray end of the spray assembly sprays the spray liquid directly against the uppermost partition. Part of the spray liquid passes through the through holes of multiple partitions and forms multiple spray water curtains in the serpentine channel. The remaining spray liquid flows downward along the serpentine channel. The tail gas to be desulfurized can also contact the spray liquid below it while passing through the multiple spray water curtains, effectively increasing the contact area between the tail gas and the spray liquid. Therefore, the present application can ensure sufficient desulfurization reaction without increasing the length of the air inlet channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the high-efficiency desulfurization spray tower for acidic tail gas provided in an embodiment of the present application;

[0018] Figure 2 A schematic diagram of the flow of tail gas in a high-efficiency desulfurization spray tower for acid-containing tail gas provided in an embodiment of the present application;

[0019] Figure 3 A schematic diagram of the flow of spray liquid in a spray tower for efficient desulfurization of acid-containing tail gas provided in an embodiment of the present application;

[0020] Figure 4 This is a schematic diagram of the structure of the spray assembly in the spray tower for efficient desulfurization of acid-containing tail gas provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present application are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present application to illustrate the principles of the present application, and are not used to limit the scope of the present application.

[0022] like Figure 1-3 As shown, the present application provides an efficient desulfurization spray tower for acid tail gas, comprising a tower body 100, a plurality of baffles 200, an air inlet pipe 300 and a spray assembly 400. The top of the tower body 100 is provided with an exhaust port 110 and the bottom is provided with a liquid discharge port 120. The plurality of baffles 200 are sequentially arranged in the tower body 100 along the vertical direction to separate the interior of the tower body 100 into a serpentine channel 130. The top of the serpentine channel 130 is connected to the exhaust port 110. The plurality of baffles 200 are all connected to the exhaust port 110. A plurality of holes are opened, one end of the air inlet pipe 300 is connected to the exhaust gas, and the other end is connected to the bottom of the serpentine channel 130, so that the exhaust gas can flow upward along the serpentine channel 130. The spray component 400 is arranged at the top of the tower body 100. The spray component 400 has a spray end arranged facing the uppermost partition 200. Part of the spray liquid passes through the through holes 210 of the multiple partitions 200 and forms multiple spray water curtains in the serpentine channel 130, and the remaining spray liquid flows downward along the serpentine channel 130.

[0023] In this embodiment, the exhaust gas to be desulfurized enters the tower body 100 from the bottom, flows upward along the serpentine channel 130, and is discharged from the exhaust end 110. During this flow process, the spray end of the spray assembly 400 sprays the spray liquid directly toward the uppermost baffle 200. Part of the spray liquid passes through the through holes 210 of the multiple baffles 200 and forms multiple spray water curtains within the serpentine channel 130. The remaining spray liquid flows downward along the serpentine channel 130. During the process of passing through the multiple spray water curtains, the exhaust gas to be desulfurized can also contact the spray liquid below it, effectively increasing the contact area between the exhaust gas and the spray liquid. Therefore, this embodiment can ensure sufficient desulfurization reaction without increasing the length of the air inlet channel.

[0024] In this embodiment, a plurality of partitions 200 are provided inside the tower body 100 . The plurality of partitions 200 are arranged in sequence in the vertical direction in the tower body 100 to separate the interior of the tower body 100 into a serpentine channel 130 , and the exhaust gas flows upward along the serpentine channel 130 .

[0025] The plurality of partitions 200 are staggeredly arranged on the inner walls of both sides of the tower body 100 in a vertical direction, and the plurality of partitions 200 are all arranged horizontally.

[0026] In this embodiment, the air inlet pipe 300 is connected to the side wall of the bottom of the tower body 100, and the air inlet direction of the air inlet pipe 300 is directed to the gap between the partition 200 above it and the inner wall of the tower body 100. The exhaust gas can be transported into the tower body 100 under the action of the fan.

[0027] The spray assembly 400 in this embodiment is arranged at the top of the tower body 100. The spray assembly 400 has a spray end arranged opposite to the uppermost partition 200. Part of the spray liquid passes through the through holes 210 of multiple partitions 200 and forms multiple spray water curtains in the serpentine channel 130, and the remaining spray liquid flows downward along the serpentine channel 130.

[0028] As the spray liquid flows downward, it gradually accumulates at the bottom of the tower body 100. At the same time, as the spray liquid reacts with the sulfur substances in the exhaust gas, reaction liquid is continuously generated. In the vertical downward direction, the spray liquid continues to decrease and the reaction liquid continues to increase. Therefore, the more spray liquid content in the mixed liquid (a mixture of spray liquid and reaction liquid) that the exhaust gas contacts during the upward flow, the more sulfur substances can be ensured in the exhaust gas discharged from the exhaust end 110.

[0029] It should be noted that the above-mentioned spray liquid can be alkaline solution or ammonia water, and the reaction liquid is a solution generated by the reaction of the spray liquid with the sulfur substances in the tail gas.

[0030] Because the mixed liquid at the bottom contains less spray liquid, the acidic tail gas high-efficiency desulfurization spray tower further includes multiple nozzles 410 mounted on the lowest baffle 200. The multiple nozzles 410 are disposed at the bottom of the baffle 200 and are respectively connected to the multiple through holes 210. The mixed liquid on the baffle 200 is discharged through the nozzles 410, atomizing the mixed liquid and increasing its contact area with the tail gas.

[0031] To facilitate the efficient introduction of the mixed liquid on the baffle 200 into the spray head 410, the acid tail gas high-efficiency desulfurization spray tower further includes a water retaining frame 420 mounted on the lowest baffle 200. The water retaining frame 420 is connected to the outer edge of the top of the baffle 200 to form a water retaining cavity that connects to the multiple through-holes 210. The mixed liquid flowing onto the lowest baffle 200 is collected by the water retaining cavity.

[0032] To prevent exhaust gas entering the tower body 100 from being discharged through the drain end 120, the high-efficiency desulfurization spray tower for acidic exhaust gas further includes a drain valve 121 installed within the drain end 120 for opening and closing the drain end 120. In one embodiment, the high-efficiency desulfurization spray tower for acidic exhaust gas further includes a high-level sensor 122 and a low-level sensor 123 installed within the tower body 100. The high-level sensor 122 is located below the intake pipe 300. The high-level sensor 122, the low-level sensor 123, and the drain end 120 are arranged in a vertically downward direction. When the liquid level reaches the high-level sensor 122, the drain valve 121 is controlled to open, and the liquid level at the bottom of the tower body 100 decreases until it reaches the low-level sensor 123, at which point the drain valve 121 is controlled to close. This ensures that mixed liquid is always present at the bottom of the tower body 100, preventing exhaust gas from being discharged through the drain end 120. The mixed liquid ultimately discharged from the drain end 120 can be processed and reused.

[0033] To prevent the incoming exhaust gas from flowing too fast, causing the exhaust gas to pass upward through the through-holes 210 of the partition 200 and prevent the spray liquid from passing through the through-holes 210 to form a spray water curtain, the aperture of the through-holes 210 can be increased. Furthermore, in one embodiment, the high-efficiency desulfurization spray tower for acidic exhaust gas further includes a buffer tank 310 mounted on the side wall of the tower body 100. The buffer chamber of the buffer tank 310 is connected to the serpentine passage 130.

[0034] By providing a buffer chamber, the exhaust gas flowing through the serpentine channel 130 can be diverted, allowing some of the exhaust gas to flow into the buffer chamber, thereby reducing the flow rate within the serpentine channel 130. It is understood that multiple buffer boxes 310 can be provided, and multiple buffer boxes 310 are arranged in sequence along the vertical direction. The size and number of buffer boxes 310 should ensure that the spray liquid on the partition 200 can pass through the through-holes 210. At the same time, it should be noted that the more or larger buffer boxes 310, the better the effect. The more and larger the buffer boxes 310, the lower the exhaust gas flow rate within the serpentine channel 130, which affects the exhaust gas treatment efficiency.

[0035] To prevent part of the spray liquid from staying in the buffer box 310 , in one embodiment, the inner bottom wall of the buffer box 310 is tilted downward in a direction close to the serpentine channel 130 .

[0036] like Figure 4 As shown, in one embodiment, the spray assembly 400 includes a plurality of water distribution rings 430, a cross connecting frame 440, a water inlet pipe 450 and a plurality of spray heads. The plurality of water distribution rings 430 are coaxially arranged and the diameters are increased from the inside to the outside. The tops of the plurality of water distribution rings 430 are fixedly connected to the inner wall of the tower body 100 via the cross connecting frame 440. One end of the water inlet pipe 450 is connected to the spray liquid, and the other end of the water inlet pipe 450 is connected to the plurality of water distribution rings 430. The bottom of each water distribution ring 430 is connected to a plurality of spray heads evenly arranged along its circumferential direction.

[0037] Compared with the prior art, the present application provides an efficient desulfurization spray tower for acidic tail gas, in which the tail gas to be desulfurized enters from the bottom of the tower body 100, flows upward along the serpentine channel 130 and is discharged from the exhaust end 110. During the above flow process, the spray end of the spray assembly 400 sprays the spray liquid directly onto the uppermost partition 200, and part of the spray liquid passes through the through holes 210 of multiple partitions 200 and forms multiple spray water curtains in the serpentine channel 130, and the remaining spray flows downward along the serpentine channel 130. The tail gas to be desulfurized can also contact the spray liquid below it in the process of passing through multiple spray water curtains, effectively increasing the contact area between the tail gas and the spray liquid. Therefore, the desulfurization reaction can be fully ensured without increasing the length of the air inlet channel.

[0038] The above is only a preferred specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in this application should be covered by the scope of protection of the present application.

Claims

1. A high-efficiency desulfurization spray tower for acidic tail gas, characterized in that: include: A tower body, with an exhaust port at the top and a liquid discharge port at the bottom; A plurality of partitions are sequentially arranged in the tower body along a vertical direction to separate the interior of the tower body into a serpentine channel, the top of the serpentine channel is connected to the exhaust end, and a plurality of the partitions are each provided with a plurality of holes; an air intake pipe, one end of which is connected to the exhaust gas and the other end of which is connected to the bottom of the serpentine channel so as to allow the exhaust gas to flow upward along the serpentine channel; A spray assembly is arranged at the top of the tower body. The spray assembly has a spray end arranged opposite to the uppermost partition. Part of the spray liquid passes through the through holes of multiple partitions and forms multiple spray water curtains in the serpentine channel, and the remaining spray liquid flows downward along the serpentine channel.

2. The high-efficiency desulfurization spray tower for acidic tail gas according to claim 1, characterized in that: The plurality of partitions are staggeredly arranged on the inner walls of both sides of the tower body in a vertical direction, and the plurality of partitions are all arranged horizontally.

3. The high-efficiency desulfurization spray tower for acidic tail gas according to claim 1, characterized in that: The air inlet pipe is communicated with the side wall of the bottom of the tower body, and the air inlet direction of the air inlet pipe is directed to the gap between the partition above the air inlet pipe and the inner wall of the tower body.

4. The high-efficiency desulfurization spray tower for acidic tail gas according to claim 1, characterized in that: The acid-containing tail gas high-efficiency desulfurization spray tower further comprises a plurality of nozzles installed on the lowermost partition plate. The plurality of nozzles are arranged at the bottom of the partition plate and are respectively connected to the plurality of through holes.

5. The acid-containing tail gas high-efficiency desulfurization spray tower according to claim 4, characterized in that: The acid tail gas high-efficiency desulfurization spray tower further comprises a water retaining frame installed on the lowest partition, wherein the water retaining frame is connected to the outer edge of the partition top to form a water retaining cavity communicating with the plurality of through holes.

6. The high-efficiency desulfurization spray tower for acidic tail gas according to claim 1, characterized in that: The acid-containing tail gas high-efficiency desulfurization spray tower further comprises a liquid discharge valve installed in the liquid discharge end for opening and closing the liquid discharge end.

7. The high-efficiency desulfurization spray tower for acidic tail gas according to claim 6, characterized in that: The high-efficiency desulfurization spray tower for acidic tail gas also includes a high-position sensor and a low-position sensor installed in the tower body. The high-position sensor is located below the air intake pipe, and the high-position sensor, the low-position sensor and the discharge end are arranged in sequence in a vertical downward direction.

8. The high-efficiency desulfurization spray tower for acidic tail gas according to claim 1, characterized in that: The acid-containing tail gas high-efficiency desulfurization spray tower further comprises a buffer box installed on the side wall of the tower body, and a buffer cavity of the buffer box is connected to the serpentine channel.

9. The high-efficiency desulfurization spray tower for acidic tail gas according to claim 8, characterized in that: The inner bottom wall of the buffer box is arranged to be inclined downward in a direction close to the serpentine channel.

10. The high-efficiency desulfurization spray tower for acidic tail gas according to claim 1, characterized in that: The spray assembly includes multiple water distribution rings, a cross connecting frame, a water inlet pipe and multiple spray heads. The multiple water distribution rings are coaxially arranged and the diameters increase successively from the inside to the outside. The tops of the multiple water distribution rings are fixedly connected to the inner wall of the tower body via the cross connecting frame. One end of the water inlet pipe is connected to the spray liquid, and the other end of the water inlet pipe is connected to the multiple water distribution rings. The bottom of each water distribution ring is connected to the multiple spray heads evenly arranged along its circumferential direction.

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