A new type of submerged caustic soda absorption tank

Abstract

This application relates to the field of waste gas treatment technology, specifically disclosing a novel submerged alkaline absorption tank, comprising: an alkaline chamber located at the bottom of the entire tank, with a circulation port on the alkaline chamber; an inlet chamber located above the alkaline chamber and in the middle along the width of the tank, communicating with the alkaline chamber; an outlet chamber located above the inlet chamber and the alkaline chamber, separated from the alkaline chamber by a slit partition; an inlet pipe extending through the outlet chamber, with its lower end connected to the inlet chamber and its upper end opening at the top of the tank; and an alkaline nozzle located inside the inlet pipe and connected to the circulation port. Compared to traditional structures, this application changes the traditional absorption tower's "dispersed contact within the tower" mode, achieving directional airflow guidance through chamber partitioning. Combined with the built-in alkaline nozzle, this allows the exhaust gas to contact the alkaline solution immediately upon entering the equipment, solving the problems of delayed initial contact and disordered airflow distribution in traditional absorption towers, laying the foundation for subsequent deep absorption.

Description

Technical Field

[0001] This application relates to the field of waste gas treatment technology, and in particular to a novel submerged alkaline absorption tank. Background Technology

[0002] During the production process of chemical enterprises, various organic waste gases are inevitably generated in the production process, and the industry usually uses combustion methods to treat them.

[0003] In chemical production, products or intermediates often undergo substitution reactions on alkanes, alkenes, alkynes, or aromatics to generate chlorine- or sulfur-containing derivatives. This results in the production of acidic gases such as SO2 and HCl during combustion, necessitating further treatment of the exhaust gases. Typically, an alkaline absorption tower is connected in series after the combustion furnace for acid-base neutralization. However, in engineering practice, it has been found that the treatment effect of alkaline absorption towers is unstable, frequently exceeding standards. On-site research and analysis revealed the following main problems: As the alkaline solution flows downwards, its concentration gradually decreases due to continuous acid-base neutralization reactions, leading to a gradual deterioration in the absorption effect on acidic exhaust gases; the acidic exhaust gas enters the tower from the bottom and is unevenly distributed across the cross-section, resulting in insufficient contact and short contact time between the exhaust gas and the alkaline solution, further degrading and unstable the acid-base absorption effect. Utility Model Content

[0004] The purpose of this application is to provide a novel submerged alkaline absorption tank to solve the above-mentioned problems.

[0005] To achieve the above objectives, the technical solution of this application is as follows: A novel submerged alkaline solution absorption tank includes: An alkali solution chamber is located at the bottom of the entire tank, and the alkali solution chamber is equipped with a circulation port; An air inlet chamber is located above the alkali solution chamber and in the middle along the width direction of the tank body, and is in communication with the alkali solution chamber. An exhaust chamber is located above the air inlet chamber and the alkali solution chamber, and is separated from the alkali solution chamber by a slit partition. An air inlet pipe is provided through the air outlet chamber, with its lower end connected to the air inlet chamber and its upper end opening at the top of the tank body; An alkaline solution nozzle is installed inside the air inlet pipe and connected to the circulation port.

[0006] Preferably, the liquid level of the alkali solution in the alkali solution chamber is located above the slit partition.

[0007] Preferably, the alkaline solution chamber is provided with a backwash main pipe and backwash branch pipes, and multiple backwash main pipes are spaced apart along the length of the tank; the backwash branch pipes are arranged perpendicular to the backwash main pipe in the horizontal plane and are connected to the backwash main pipe. The backwash branch pipe is equipped with a flushing hole.

[0008] Preferably, the flushing holes are staggered on both sides of the vertical plane, and all of them are obliquely downward opening away from the axis of the backwashing branch pipe.

[0009] Preferably, the alkali chamber is provided with a drain outlet, which is located on one end side wall of the tank along its length.

[0010] Preferably, the air intake pipe is provided with an alkaline spray pipe, the alkaline spray head is disposed on a section of the alkaline spray pipe located inside the air intake pipe, and the end of the alkaline spray pipe located outside the air intake pipe is connected to the circulation port.

[0011] Preferably, the air intake pipes are provided at intervals along the length of the tank.

[0012] Preferably, the top of the air outlet chamber is provided with an air outlet; The alkaline solution chamber is equipped with a reserved port for a level gauge, a reserved port for a thermometer, a reserved port for a pH meter, and a spare reserved port.

[0013] Preferably, the air outlet chamber is provided with an air outlet pressure inspection port, which is located at the top of the tank; the air inlet chamber is provided with an air inlet pressure inspection port, which is located on one end side wall of the tank along its length.

[0014] Preferably, the alkali chamber is provided with a water inlet and an alkali inlet, which are located on the side walls at both ends of the tank along its length.

[0015] The novel submerged alkali absorption tank disclosed in this application changes the traditional absorption tower's "dispersed contact within the tower" mode. It achieves directional airflow guidance through cavity partitioning and, together with the built-in alkali nozzles, allows the exhaust gas to come into contact with the alkali solution as soon as it enters the equipment. This solves the problems of delayed initial contact and disordered airflow distribution in traditional absorption towers, laying the foundation for subsequent deep absorption. Attached Figure Description

[0016] Figure 1 This is a top view of the overall structure of this application; Figure 2 This is a schematic diagram of the arrangement of the air intake pipe and air outlet from the main view angle of the overall structure of this application. Figure 3This is a schematic diagram of the observation port arrangement structure from the main viewing angle of the overall structure of this application; Figure 4 This is a left view of the overall structure of this application; Figure 5 This is a right view of the overall structure of this application; Figure 6 For this application Figure 1 Structural diagram of the C-section; Figure 7 For this application Figure 1 DD section structural diagram; Figure 8 This is a schematic diagram of the gap partition structure in this application; Figure 9 This is a schematic diagram of the structural layout of the backwash main pipe and backwash branch pipes in this application; Figure 10 This is a schematic diagram of the flushing hole arrangement on the backflushing branch pipe in this application; Figure 11 This is a schematic diagram of the cross-sectional structure of the backwash branch pipe in this application.

[0017] In the picture: 1. Tank body; 2. Air inlet pipe; 3. Air outlet; 4. Observation port; 5. Maintenance manhole; 6. Air outlet pressure check port; 7. Flushing port; 8. Water inlet; 9. Level gauge reserved port; 10. Sewage outlet; 11. Circulation port; 12. Thermometer reserved port; 13. pH meter reserved port; 14. Air inlet pressure check port; 15. Reserved port; 16. Alkali replenishment port; 17. Gap partition; 18. Alkali spray pipe; 19. Alkali nozzle; 20. Air inlet chamber; 21. Alkali chamber; 22. Air outlet chamber; 23. Narrow slit; 24. Backwash main pipe; 25. Backwash branch pipe; 26. Flushing hole. Detailed Implementation

[0018] The present application will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the present application, and therefore only show the components relevant to the present application.

[0019] like Figure 1-11 As shown, a novel submerged alkali absorption tank includes: an alkali chamber 21, located at the bottom of the entire tank body 1, with a circulation port 11 on the alkali chamber 21; an air inlet chamber 20, located above the alkali chamber 21 and in the middle along the width direction of the tank body 1, communicating with the alkali chamber 21; an air outlet chamber 22, located above the air inlet chamber 20 and the alkali chamber 21, separated from the alkali chamber 21 by a gap partition 17; an air inlet pipe 2, passing through the air outlet chamber 22, with its lower end connected to the air inlet chamber 20 and its upper end opening at the top of the tank body 1; and an alkali spray nozzle 19, located inside the air inlet pipe 2 and connected to the circulation port 11.

[0020] The interior of tank 1 adopts a layered and chambered spatial layout: the alkali chamber 21, as the core reaction area, is located at the bottom of tank 1, providing sufficient reaction volume for acid-base neutralization, and the circulation port 11 on its side wall can realize the circulation and mixing of alkali solution.

[0021] The air intake chamber 20 is located in the middle of the width of the tank 1 above the alkali chamber 21 and is directly connected to the alkali chamber 21. This position design allows the exhaust gas to be introduced from the air intake pipe 2 and quickly sink to the alkali chamber 21, avoiding the airflow from lingering at the edge of the tank 1.

[0022] The exhaust chamber 22 is located above the intake chamber 20 and the alkali chamber 21, and is separated from the alkali chamber 21 by the gap partition 17, forming an orderly airflow path of "intake-reaction-exhaust". The intake pipe 2 passes through the exhaust chamber 22 and its lower end is connected to the intake chamber 20, while its upper end is open at the top of the tank 1. This through-type design not only avoids the exhaust chamber 22 from blocking the intake path, but also allows the exhaust gas to come into contact with the alkali nozzle 19 in the pipe before entering the intake chamber 20. The alkali nozzle 19 is built into the intake pipe 2 and connected to the circulation port 11, through which pressurized alkali can be introduced.

[0023] Compared to traditional structures, this application changes the traditional absorption tower's "dispersed contact within the tower" mode. By partitioning the cavity, it achieves directional airflow guidance. Combined with the built-in alkali spray nozzle 19, it allows the exhaust gas to come into contact with the alkali solution as soon as it enters the equipment. This solves the problems of delayed initial contact and disordered airflow distribution in traditional absorption towers, laying the foundation for subsequent deep absorption.

[0024] Multiple slits 23 are arranged on the slit partition 17, and the width of the slits 23 can be 0.5 to 2 mm.

[0025] The height of the alkaline solution above the gap partition 17 can be 3.0 to 10.0 cm.

[0026] In some further embodiments, the liquid level of the alkali in the alkali chamber 21 is located above the slit partition 17.

[0027] The liquid level of the alkali solution in the alkali solution chamber 21 is controlled above the slit baffle 17, meaning the slit baffle 17 is in a "submerged" state. This design forces the exhaust gas to pass through the alkali layer above the slit baffle 17 when entering the outlet chamber 22 from the alkali solution chamber 21. The slit structure forces the exhaust gas to pass through the alkali solution in the form of tiny bubbles, creating intense turbulent mixing. Compared to the situation in traditional absorption towers where "gas and liquid flow in opposite directions but the contact is brief," the submerged slit baffle 17 significantly extends the gas-liquid contact time and avoids the "short-circuit" problem of untreated exhaust gas directly escaping from the slits, significantly improving the removal efficiency of acidic gases and further compensating for the insufficient contact defects of traditional equipment.

[0028] In some further embodiments, the alkaline chamber 21 is provided with a backwash main pipe 24 and a backwash branch pipe 25. Multiple backwash main pipes 24 are provided at intervals along the length of the tank body 1. The backwash branch pipes 25 are arranged perpendicular to the backwash main pipes 24 in the horizontal plane and are connected to the backwash main pipes 24. The backwash branch pipes 25 are provided with flushing holes 26.

[0029] The backwashing system at the bottom of the alkali chamber 21 includes a backwashing main pipe 24 and backwashing branch pipes 25. Multiple backwashing main pipes 24 are spaced apart along the length of the tank body 1 to ensure coverage of the bottom of the alkali chamber 21. The backwashing branch pipes 25 are arranged perpendicular to the main pipe in the horizontal plane and connected to it to form a grid-like flushing structure. The flushing holes 26 opened on the branch pipes can spray the flushing liquid evenly.

[0030] In response to the actual needs of chemical tail gas treatment, dust particles and precipitates generated by acid-base reactions in the tail gas tend to accumulate at the bottom of the alkali chamber 21, resulting in a reduction in effective reaction volume and obstruction of alkali flow. This backwashing system can achieve full coverage of the bottom of the chamber through a grid-like pipeline layout, avoiding local accumulation of precipitates and solving the problem of long-term reduced operating efficiency caused by the lack of a targeted flushing structure in traditional absorption towers.

[0031] The backwash main pipe 24 has an opening in the outer wall of the tank 1, which is designated as the flushing port 7.

[0032] In some further embodiments, the flushing holes 26 are staggered on both sides of the vertical plane and are all obliquely downward opening away from the axis of the backflushing branch pipe 25.

[0033] The flushing holes 26 are designed to be staggered on both sides of the vertical plane and open obliquely downward away from the axis of the backflushing branch pipe 25. In practical applications, the arrangement at a 45° angle to the horizontal direction can be preferred.

[0034] The staggered layout avoids mutual interference of the flushing fluids, and the downward-sloping openings allow the flushing fluids to directly impact the sediment at the bottom of tank 1, forming a directional flushing force. Compared with single-direction or horizontal openings, this design can effectively eliminate flushing dead angles, ensure that sediments are fully stripped off and discharged with the flushing fluid, further improve the cleaning efficiency of backflushing, and ensure the cleanliness of the bottom of the alkali chamber 21.

[0035] The diameter of the flushing hole 26 can be 10 mm.

[0036] In some further embodiments, the alkali chamber 21 is provided with a drain port 10, which is located on one end side wall of the tank body 1 along the length direction.

[0037] The drain outlet 10 is located on one end of the side wall of the tank 1 along its length, and is matched with the flushing direction of the backwashing system, so that the wastewater containing dirt generated by backwashing can flow to the drain outlet 10 for discharge.

[0038] This end-side arrangement avoids interference between the drain outlet 10 and the internal flow field of the alkali solution chamber 21. It also facilitates connection with the plant's sewage network, enabling rapid and centralized discharge of waste, preventing secondary pollution caused by the retention of rinsing wastewater in the chamber, and ensuring the purity and reactivity of the alkali solution.

[0039] In some further embodiments, an alkaline spray pipe 18 is provided on the air intake pipe 2, and an alkaline spray nozzle 19 is provided on a section of the alkaline spray pipe 18 located inside the air intake pipe 2. The end of the alkaline spray pipe 18 located outside the air intake pipe 2 is connected to the circulation port 11.

[0040] An alkaline spray pipe 18 is added to the air intake pipe 2. An alkaline spray nozzle 19 is installed in the section of the alkaline spray pipe 18 located inside the air intake pipe 2. One end of the alkaline spray pipe 18 is connected to the circulation port 11, and the circulating alkaline solution can be pressurized by a centrifugal pump.

[0041] The alkaline spray pipe 18 enables precise delivery of alkaline solution into the inlet pipe 2. The pressurized alkaline solution is atomized into micron-sized droplets by the nozzle, allowing immediate contact with the exhaust gas entering the inlet pipe 2, thus achieving preliminary neutralization before it enters the inlet chamber 20. This design solves the problem of uneven contact between atomized droplets and airflow caused by the dispersed arrangement of spray nozzles within the traditional absorption tower system. The "pre-contact within the pipe" mode improves the initial neutralization efficiency and reduces the processing load on the subsequent alkaline solution chamber 21.

[0042] In some other embodiments, there are two circulation ports 11, located on both sides of the tank body 1 along the width direction. In actual operation, the two circulation ports 11 can also be connected in a loop.

[0043] In some further embodiments, the air intake pipe 2 is provided at intervals along the length of the tank body 1.

[0044] Multiple air inlet pipes 2 are spaced apart along the length of the tank 1, and the spacing can be reasonably determined according to the length of the tank 1 and the exhaust gas treatment volume. Multiple air inlet pipes 2 can ensure that the exhaust gas enters the air inlet chamber 20 evenly and in large quantities, which solves the problem of uneven airflow distribution caused by the single air inlet path in traditional absorption towers, and indirectly ensures the stability of gas-liquid contact.

[0045] In some further embodiments, the top of the vent chamber 22 is provided with a vent 3; the alkaline solution chamber 21 is provided with a level gauge reserved port 9, a thermometer reserved port 12, a pH meter reserved port 13 and a spare reserved port 15.

[0046] The vent 3 at the top of the vent chamber 22 serves as the final exhaust channel for the exhaust gas. A level gauge is installed at the level gauge port 9 on the alkali solution chamber 21 to monitor the alkali solution level in real time, ensuring the submersion depth of the slit baffle 17 meets requirements. A thermometer is installed at the thermometer port 12 to monitor the alkali solution temperature (the temperature of the acid-base neutralization reaction affects the reaction rate). A pH meter is installed at the pH meter port 13 to monitor the alkali solution concentration in real time. The spare port 15 can be used to add auxiliary interfaces such as sampling ports according to actual needs. These reserved ports 15 enable comprehensive monitoring and control of equipment operating parameters, solving the problem of insufficient parameter monitoring in traditional absorption towers leading to the inability to adjust key indicators such as alkali solution concentration and level in a timely manner, thus providing data support for stable equipment operation.

[0047] In some further embodiments, the air outlet chamber 22 is provided with an air outlet pressure inspection port 6, which is located on the top of the tank body 1; the air inlet chamber 20 is provided with an air inlet pressure inspection port 14, which is located on one end side wall of the tank body 1 along its length.

[0048] The outlet pressure check port 6 is located at the top of the tank 1, and the inlet pressure check port 14 is located on one end of the side wall along the length of the tank 1. Both can be connected to pressure sensors or other pressure detection devices to monitor the pressure of the inlet chamber 20 and the outlet chamber 22 in real time, thereby obtaining the pressure difference. This pressure difference is the core driving force for the tail gas to flow along the “inlet chamber 20 → alkali chamber 21 → outlet chamber 22” (which can be formed by negative pressure suction on the side of the outlet chamber 22 by a vacuum pump). By monitoring the data from the two pressure check ports, parameters such as the power of the vacuum pump can be adjusted in a timely manner to ensure that the pressure difference is within a reasonable range. This avoids the tail gas flow rate being too fast and the contact time being insufficient due to excessive pressure difference, or the air flow stagnating due to insufficient pressure difference. This solves the problem of fluctuating treatment effect caused by inaccurate control of air flow driving force in traditional absorption towers.

[0049] In some further embodiments, the alkali chamber 21 is provided with a water inlet 8 and an alkali inlet 16, which are located on the side walls at both ends of the tank body 1 along the length direction.

[0050] Water inlet 8 and alkali inlet 16 are located on the side walls at both ends of the tank 1 along its length. Water inlet 8 is used to replenish the water lost due to tail gas entrainment and maintain the alkali liquid level. Alkali inlet 16 is used to replenish the alkali liquid consumed by the neutralization reaction and maintain the alkali liquid concentration.

[0051] The design with two ends, combined with the alkaline solution circulation system of circulation port 11, allows the replenished water and alkaline solution to quickly mix with the original alkaline solution in the chamber, avoiding problems such as excessively high or low local alkaline solution concentration and local fluctuations in the liquid level. This solves the problem of uneven alkaline solution concentration caused by unreasonable water and alkali replenishment positions in traditional absorption towers, and ensures the stability of the acid-base neutralization reaction.

[0052] Circulation port The top of the tank body 1 is also provided with an observation port 4, and the side wall of the tank body 1 along the width direction is provided with a maintenance manhole 5.

[0053] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. A novel submerged alkaline solution absorption tank, characterized in that, include: The alkali chamber (21) is located at the bottom of the entire tank (1), and the alkali chamber (21) is provided with a circulation port (11). An air inlet chamber (20) is located above the alkali chamber (21) and in the middle of the width direction of the tank body (1), and is in communication with the alkali chamber (21); The exhaust chamber (22) is located above the air inlet chamber (20) and the alkali chamber (21), and is separated from the alkali chamber (21) by a slit partition (17); An air inlet pipe (2) is provided through the air outlet chamber (22), with its lower end connected to the air inlet chamber (20) and its upper end opening at the top of the tank body (1); The alkaline spray nozzle (19) is installed inside the air inlet pipe (2) and connected to the circulation port (11).

2. The novel submerged alkaline solution absorption tank according to claim 1, characterized in that, The surface of the alkali solution in the alkali solution chamber (21) is located above the slit partition (17).

3. The novel submerged alkaline absorption tank according to claim 1, characterized in that, The alkaline chamber (21) is provided with a backwash main pipe (24) and backwash branch pipes (25). Multiple backwash main pipes (24) are provided at intervals along the length of the tank (1). The backwash branch pipes (25) are arranged perpendicular to the backwash main pipes (24) in the horizontal plane and are connected to the backwash main pipes (24). The backwash branch pipe (25) is provided with a flushing hole (26).

4. The novel submerged alkaline solution absorption tank according to claim 3, characterized in that, The flushing holes (26) are staggered on both sides of the vertical plane, and are all set to open obliquely downward away from the axis of the backwashing branch pipe (25).

5. The novel submerged alkaline solution absorption tank according to claim 4, characterized in that, The alkaline solution chamber (21) is provided with a drain outlet (10), which is located on one end side wall of the tank (1) along the length direction.

6. The novel submerged alkaline absorption tank according to claim 1, characterized in that, The air intake pipe (2) is provided with an alkaline spray pipe (18), and the alkaline spray head (19) is located on a section of the alkaline spray pipe (18) inside the air intake pipe (2). The end of the alkaline spray pipe (18) located outside the air intake pipe (2) is connected to the circulation port (11).

7. The novel submerged alkaline solution absorption tank according to claim 1, characterized in that, The air intake pipe (2) is provided at intervals along the length of the tank (1).

8. The novel submerged alkaline solution absorption tank according to claim 1, characterized in that, The top of the air outlet chamber (22) is provided with an air outlet (3); The alkaline solution chamber (21) is provided with a level gauge reserved port (9), a thermometer reserved port (12), a pH meter reserved port (13), and a spare reserved port (15).

9. The novel submerged alkaline solution absorption tank according to claim 1, characterized in that, The air outlet chamber (22) is provided with an air outlet pressure inspection port (6), which is located at the top of the tank body (1); the air inlet chamber (20) is provided with an air inlet pressure inspection port (14), which is located on one end side wall of the tank body (1) along the length direction.

10. The novel submerged alkaline absorption tank according to claim 1, characterized in that, The alkaline solution chamber (21) is provided with a water inlet (8) and an alkaline solution inlet (16), which are located on the side walls at both ends of the tank body (1) along the length direction.

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