High-efficiency desulfurization spray tower for acid-containing tail gas

Abstract

The present application relates to a high-efficiency desulfurization spray tower for an acid-containing tail gas, which comprises a tower body, a plurality of baffles, an air intake pipe, and a spray assembly. A top portion of the tower body is provided with an exhaust end, and a bottom portion thereof is provided with a liquid discharge end. The plurality of baffles are sequentially arranged in the tower body in the vertical direction, and a top portion of a serpentine passage is in communication with the exhaust end. Each of the plurality of baffles is provided with a plurality of holes. One end of the air intake pipe is externally connected to a tail gas, and the other end thereof is in communication with a bottom portion of the serpentine passage, so as to allow the tail gas to flow upward along the serpentine passage. The spray assembly is arranged at the top portion of the tower body and has a spray end facing the uppermost baffle. The spray end of the spray assembly sprays a spray liquid onto the uppermost baffle. Part of the spray liquid traverses the holes of the plurality of baffles, forming multiple spray water curtains within the serpentine passage, while the remaining spray liquid flows downward along the serpentine passage. During a process in which the tail gas to be desulfurized traverses the multiple spray water curtains, said tail gas can further contact the spray liquid therebelow, effectively increasing the contact area between the tail gas and the spray liquid.

Description

High-efficiency desulfurization spray tower for acid-containing tail gas TECHNICAL FIELD

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

[0002] Tail gas such as acid-making tail gas usually contains harmful substances such as sulfur dioxide, and needs to be desulfurized before being discharged. At present, the spray tower is mostly used to spray ammonia water / limestone slurry to desulfurize.

[0003] Chinese patent CN220900022U discloses a boiler tail gas desulfurization and denitrification spray tower. The gas inlet channel is obliquely arranged to cooperate with the spiral gas inlet channel to control the movement direction of the spiral rising of the flue gas. The spray pipe in the inner wall of the gas inlet channel cooperates with the catalyst reactor to increase the reverse contact area of the flue gas and the solution, and the catalytic decomposition desulfurization and denitrification effect is better. The waste water is more easily carried away from the channel along the inclined inner wall, and is collected at the bottom of the inner wall of the spray tower.

[0004] However, the desulfurizer such as ammonia water or limestone slurry gathers into a group and flows down along the gas inlet channel, and the contact area with the tail gas is limited, so it is necessary to lengthen the length of the gas inlet channel to ensure the desulfurization effect, but at the same time, the desulfurization efficiency is also reduced.

[0005] SUMMARY

[0006] Therefore, it is necessary to provide a high-efficiency desulfurization spray tower for acid-containing tail gas to solve the problem that the desulfurization of the existing spray tower needs to lengthen the length of the gas inlet channel to ensure the desulfurization effect, but at the same time, the desulfurization efficiency is also reduced.

[0007] The present application provides a high-efficiency desulfurization spray tower for acid-containing tail gas, which comprises a tower body, a plurality of partitions, a gas inlet pipe and a spray assembly. The top of the tower body is provided with an exhaust end and the bottom is provided with a liquid discharge end. A plurality of partitions are arranged in the tower body in a vertical direction to divide the inside of the tower body into a serpentine channel. The top of the serpentine channel is connected with the exhaust end. A plurality of holes are formed in each of the partitions. One end of the gas inlet pipe is connected with the tail gas, and the other end is connected with the bottom of the serpentine channel to allow the tail gas to flow upward along the serpentine channel. The 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 holes of the partitions and forms a plurality of spray water curtains in the serpentine channel, and the rest of the spray liquid flows downward along the serpentine channel.

[0008] Further, the plurality of partitions are arranged on the inner walls of the two sides of the tower body in a vertical direction, and the plurality of partitions are arranged horizontally.

[0009] Further, the air inlet pipe is connected to the sidewall of the bottom of the tower body, and the air inlet direction of the air inlet pipe is directed to the gap between the baffle and the inner wall of the tower body above the baffle.

[0010] Further, the acid-containing tail gas efficient desulfurization spray tower further comprises a plurality of spray heads installed on the lowermost baffle, and the plurality of spray heads are arranged at the bottom of the baffle and respectively connected to the plurality of through holes.

[0011] Further, the acid-containing tail gas efficient desulfurization spray tower further comprises a water blocking frame installed on the lowermost baffle, and the water blocking frame is connected to the outer edge of the top of the baffle to form a water blocking cavity connected to the plurality of through holes.

[0012] Further, the acid-containing tail gas efficient desulfurization spray tower further comprises a liquid discharge valve installed in the liquid discharge end to open and close the liquid discharge end.

[0013] Further, the acid-containing tail gas efficient desulfurization spray tower further comprises a high-level sensor and a low-level sensor installed in the tower body, the high-level sensor is located below the air inlet pipe, and the high-level sensor, the low-level sensor and the liquid discharge end are arranged in a vertical downward direction.

[0014] Further, the acid-containing tail gas efficient desulfurization spray tower further comprises a buffer tank installed on the sidewall of the tower body, and the buffer cavity of the buffer tank is connected to the serpentine channel.

[0015] Further, the inner bottom wall of the buffer tank is inclined downward in the direction close to the serpentine channel.

[0016] Further, the spray assembly comprises a plurality of water distribution rings, a cross connecting frame, a water inlet pipe and a plurality of spray heads, the plurality of water distribution rings are coaxially arranged and the diameters of the water distribution rings increase from inside to outside, the top of the plurality of water distribution rings is fixedly connected to the inner wall of the tower body through the cross connecting frame, one end of the water inlet pipe is connected to the spray liquid, the other end of the water inlet pipe is connected to the plurality of water distribution rings, and the bottom of each water distribution ring is connected to a plurality of spray heads arranged uniformly in the circumferential direction of the water distribution ring.

[0017] Compared with the prior art, the acid-containing tail gas efficient desulfurization spray tower provided by the application has the following advantages: the tail gas to be desulfurized enters from the bottom of the tower body and flows upwards along the serpentine channel and is discharged from the exhaust end. In the process of flowing, the spray end of the spray assembly sprays the spray liquid directly against the uppermost baffle. Part of the spray liquid passes through the through holes of the multiple baffles and forms multiple spray water curtains in the serpentine channel. The remaining spray liquid flows downwards along the serpentine channel. The tail gas to be desulfurized can also contact with the spray liquid below in the process of passing through the multiple spray water curtains, thereby effectively increasing the contact area of the tail gas and the spray liquid. Therefore, the application can ensure sufficient desulfurization reaction without increasing the length of the gas inlet channel. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is a schematic structural view of the acid-containing tail gas efficient desulfurization spray tower provided by the embodiment of the application;

[0019] Fig. 2 is a schematic flow view of the tail gas in the acid-containing tail gas efficient desulfurization spray tower provided by the embodiment of the application;

[0020] Fig. 3 is a schematic flow view of the spray liquid in the acid-containing tail gas efficient desulfurization spray tower provided by the embodiment of the application;

[0021] Fig. 4 is a schematic structural view of the spray assembly in the acid-containing tail gas efficient desulfurization spray tower provided by the embodiment of the application. DETAILED DESCRIPTION

[0022] The preferred embodiments of the application will be described in detail below with reference to the accompanying drawings, which form a part of this application. The accompanying drawings illustrate the principles of the application and, together with the description, serve to explain the scope of the application.

[0023] As shown in Figs. 1-3, the acid-containing tail gas efficient desulfurization spray tower provided by the application comprises a tower body 100, multiple baffles 200, a gas inlet pipe 300 and a spray assembly 400. The top of the tower body 100 is provided with an exhaust end 110 and the bottom is provided with a liquid discharge end 120. The multiple baffles 200 are sequentially arranged in the tower body 100 in the vertical direction to divide the inside of the tower body 100 into a serpentine channel 130. The top of the serpentine channel 130 is connected with the exhaust end 110. Multiple holes are formed in the multiple baffles 200. One end of the gas inlet pipe 300 is connected with the tail gas and the other end is connected with the bottom of the serpentine channel 130 to allow the tail gas to flow upwards along the serpentine channel 130. The spray assembly 400 is arranged at the top of the tower body 100. The spray assembly 400 has a spray end arranged directly against 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 in the serpentine channel 130. The remaining spray liquid flows downwards along the serpentine channel 130.

[0024] In the embodiment, the tail gas to be desulfurized enters from the bottom of the tower body 100 and flows upward along the serpentine passage 130 and is discharged from the exhaust end 110. In the process of flowing, the spraying end of the spraying assembly 400 sprays the spraying liquid against the uppermost baffle 200. Part of the spraying liquid passes through the through holes 210 of the multiple baffles 200 and forms multiple spraying water curtains in the serpentine passage 130. The rest of the spraying liquid flows downward along the serpentine passage 130. The tail gas to be desulfurized can also contact with the spraying liquid below in the process of passing through the multiple spraying water curtains, effectively increasing the contact area of the tail gas and the spraying liquid. Therefore, the embodiment can ensure sufficient desulfurization reaction without increasing the length of the gas inlet passage.

[0025] The inside of the tower body 100 in the embodiment is provided with multiple baffles 200 arranged in the tower body 100 in the vertical direction in sequence to divide the inside of the tower body 100 into a serpentine passage 130, and the tail gas flows upward along the serpentine passage 130.

[0026] The multiple baffles 200 are arranged on the inner walls of the two sides of the tower body 100 in the vertical direction in a staggered manner, and the multiple baffles 200 are all arranged horizontally.

[0027] The gas inlet pipe 300 in the embodiment is connected to the sidewall at the bottom of the tower body 100, and the gas inlet direction of the gas inlet pipe 300 is arranged to point to the gap between the baffle 200 above and the inner wall of the tower body 100. The tail gas can be transported into the tower body 100 under the action of the fan.

[0028] The spraying assembly 400 in the embodiment is arranged at the top of the tower body 100, and the spraying assembly 400 has a spraying end arranged against the uppermost baffle 200. Part of the spraying liquid passes through the through holes 210 of the multiple baffles 200 and forms multiple spraying water curtains in the serpentine passage 130. The rest of the spraying liquid flows downward along the serpentine passage 130.

[0029] In the process of flowing downward, the spraying liquid gradually accumulates at the bottom of the tower body 100. At the same time, with the reaction of the spraying liquid and the sulfur substances in the tail gas, reaction liquid is continuously generated. In the vertical downward direction, the spraying liquid is continuously reduced, and the reaction liquid is continuously increased. Therefore, the more the spraying liquid content in the mixed liquid (the mixture of the spraying liquid and the reaction liquid) contacted by the tail gas flowing upward, the more the sulfur substances can be ensured to be removed from the tail gas discharged from the exhaust end 110.

[0030] It should be noted that the spraying liquid can be alkaline solution or ammonia water, and the reaction liquid is the solution generated after the spraying liquid reacts with the sulfur substances in the tail gas.

[0031] Due to the less amount of spray liquid in the mixed liquid at the bottom, the spray tower for efficient desulfurization of acid-containing tail gas further comprises a plurality of spray heads 410 installed on the lowermost baffle 200, and the plurality of spray heads 410 are arranged at the bottom of the baffle 200 and respectively communicate with the plurality of through holes 210. The mixed liquid on the baffle 200 is guided out through the spray heads 410, so that the mixed liquid is atomized and the contact area with the tail gas is increased.

[0032] In order to facilitate the effective guidance of the mixed liquid on the baffle 200 into the spray head 410, the spray tower for efficient desulfurization of acid-containing tail gas further comprises a water blocking frame 420 installed on the lowermost baffle 200, and the water blocking frame 420 is connected with the outer edge of the top of the baffle 200 to form a water blocking cavity communicating with the plurality of through holes 210. The mixed liquid flowing to the lowermost baffle 200 is collected through the water blocking cavity.

[0033] In order to avoid the tail gas entering the tower body 100 from being guided out from the liquid outlet end 120, the spray tower for efficient desulfurization of acid-containing tail gas further comprises a liquid outlet valve 121 installed in the liquid outlet end 120 to open and close the liquid outlet end 120. In an embodiment, the spray tower for efficient desulfurization of acid-containing tail gas further comprises a high-level sensor 122 and a low-level sensor 123 installed in the tower body 100, the high-level sensor 122 is located at a position below the gas inlet pipe 300, and the high-level sensor 122, the low-level sensor 123 and the liquid outlet end 120 are arranged in sequence in the vertically downward direction. When the liquid level reaches the high-level sensor 122, the liquid outlet valve 121 is controlled to be opened, and the liquid level at the bottom of the tower body 100 is lowered until it reaches the low-level sensor 123, and the liquid outlet valve 121 is controlled to be closed, so as to ensure that there is always mixed liquid at the bottom of the tower body 100, and the tail gas is prevented from being guided out from the liquid outlet end 120. The mixed liquid guided out from the liquid outlet end 120 can be reused after being treated.

[0034] In order to avoid the flow rate of the entering tail gas being too large, so that the tail gas penetrates through the through holes 210 of the baffle 200 upward, and the spray liquid cannot form a spray water curtain through the through holes 210, the diameter of the through holes 210 can be increased. Meanwhile, in an embodiment, the spray tower for efficient desulfurization of acid-containing tail gas further comprises a buffer tank 310 installed on the side wall of the tower body 100, and the buffer cavity of the buffer tank 310 communicates with the serpentine channel 130.

[0035] By providing the buffer cavity, the tail gas flowing through the serpentine channel 130 can be divided, so that part of the tail gas flows into the buffer cavity, thereby reducing the flow rate in the serpentine channel 130. It can be understood that a plurality of buffer tanks 310 can be provided, and the plurality of buffer tanks 310 are arranged in sequence in the vertical direction. The size and number of the buffer tanks 310 should ensure that the spray liquid on the baffle 200 can penetrate through the through holes 210. Meanwhile, it should be noted that the more or the larger the buffer tank 310 is, the lower the flow rate of the tail gas in the serpentine channel 130 is, and the efficiency of the tail gas treatment is affected.

[0036] In order to avoid part of the spray liquid staying in the buffer tank 310, in an embodiment, the inner bottom wall of the buffer tank 310 is arranged downwardly inclined towards the direction close to the serpentine channel 130.

[0037] As shown in FIG. 4, in an embodiment, the spray assembly 400 comprises 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 sequentially increased from inside to outside, the top of the plurality of water distribution rings 430 is fixedly connected with the inner wall of the tower body 100 via the cross connecting frame 440, one end of the water inlet pipe 450 is connected with the spray liquid, the other end of the water inlet pipe 450 is communicated with the plurality of water distribution rings 430, and the bottom of each water distribution ring 430 is communicated with a plurality of spray heads arranged uniformly along the circumferential direction thereof.

[0038] Compared with the prior art, the acid-containing tail gas efficient desulfurization spray tower provided by the present application is characterized in that the tail gas to be desulfurized enters from the bottom of the tower body 100, flows upwards along the serpentine channel 130, and is discharged from the exhaust end 110, in the above-mentioned flowing process, the spray end of the spray assembly 400 sprays the spray liquid directly against the uppermost baffle 200, part of the spray liquid passes through the through holes 210 of the plurality of baffles 200 and forms a plurality of spray water curtains in the serpentine channel 130, and the rest of the spray liquid flows downwards along the serpentine channel 130, the tail gas to be desulfurized can also contact with the spray liquid below in the process of passing through the plurality of spray water curtains, effectively increasing the contact area of the tail gas and the spray liquid, thus, the desulfurization reaction can be ensured to be sufficient without increasing the length of the inlet channel.

[0039] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A high-efficiency desulfurization spray tower for acid-containing tail gas, characterized in that, The application relates to a high-efficiency desulfurization spray tower for acid-containing tail gas. The tower body is provided with a gas discharge end at the top and a liquid discharge end at the bottom. A plurality of baffles are arranged in the tower body in the vertical direction to divide the tower body into a serpentine channel, the top of the serpentine channel is communicated with the gas discharge end, and a plurality of holes are formed in the baffles. An air inlet pipe is connected to the bottom of the serpentine channel to supply the tail gas to flow upwards along the serpentine channel. A spray assembly is arranged at the top of the tower body, the spray assembly is provided with a spray end opposite to the uppermost baffle, part of the spray liquid passes through the holes of the baffles to form a plurality of spray water curtains in the serpentine channel, and the remaining spray liquid flows downwards along the serpentine channel.

2. The high-efficiency desulfurization spray tower for acid-containing tail gas according to claim 1, characterized in that, The baffles are arranged on the inner walls of the tower body in the vertical direction.

3. The high-efficiency desulfurization spray tower for acid-containing tail gas according to claim 1, characterized in that, The air inlet pipe is connected to the sidewall of the bottom of the tower body, and the air inlet direction of the air inlet pipe is directed to the gap between the baffle above and the inner wall of the tower body.

4. The high-efficiency desulfurization spray tower for acid-containing tail gas according to claim 1, characterized in that, The high-efficiency desulfurization spray tower for acid-containing tail gas further comprises a plurality of spray heads arranged on the lowermost baffle, the spray heads are arranged at the bottom of the baffle and communicated with the holes.

5. The high-efficiency desulfurization spray tower for acid-containing tail gas according to claim 4, characterized in that, The high-efficiency desulfurization spray tower for acid-containing tail gas further comprises a water blocking frame arranged on the lowermost baffle, the water blocking frame is connected to the outer edge of the top of the baffle to form a water blocking cavity communicated with the holes.

6. The high-efficiency desulfurization spray tower for acid-containing tail gas according to claim 1, characterized in that, The high-efficiency desulfurization spray tower for acid-containing tail gas further comprises a liquid discharge valve arranged in the liquid discharge end to open and close the liquid discharge end.

7. The high-efficiency desulfurization spray tower for acid-containing tail gas according to claim 6, characterized in that, The high-efficiency desulfurization spray tower for acid-containing tail gas further comprises a high-level sensor and a low-level sensor arranged in the tower body, the high-level sensor is arranged below the air inlet pipe, and the high-level sensor, the low-level sensor and the liquid discharge end are arranged in the vertical downward direction.

8. The high-efficiency desulfurization spray tower for acid-containing tail gas according to claim 1, characterized in that, The high-efficiency desulfurization spray tower for acid-containing tail gas further comprises a buffer tank arranged on the sidewall of the tower body, and the buffer cavity of the buffer tank is communicated with the serpentine channel.

9. The high-efficiency desulfurization spray tower for acid-containing tail gas according to claim 8, characterized in that, The inner bottom wall of the buffer tank is inclined downward in the direction close to the serpentine channel.

10. The high-efficiency desulfurization spray tower for acid-containing tail gas according to claim 1, characterized in that, The spray assembly comprises a plurality of water distribution rings, a cross connecting frame, a water inlet pipe and a plurality of spray heads, the water distribution rings are coaxially arranged and the diameters of the water distribution rings gradually increase from inside to outside, the top of the water distribution rings is fixedly connected to the inner wall of the tower body through the cross connecting frame, one end of the water inlet pipe is connected to the spray liquid, the other end of the water inlet pipe is communicated with the water distribution rings, and the bottom of each water distribution ring is communicated with a plurality of spray heads arranged in the circumferential direction.

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