Hydrochloric acid gas treatment device and method based on pre-atomization absorption

Abstract

The application discloses a hydrochloric acid gas treatment device and method based on pre-atomization absorption, which comprises an absorption tower, a gas inlet and a pre-absorption module, wherein the pre-absorption module is connected with the absorption tower through the gas inlet, and the pre-absorption module comprises a longitudinal gas inlet pipeline, a special-shaped gas inlet pipe and a liquid storage tank, an atomization nozzle is arranged inside the longitudinal gas inlet pipeline, a spiral plate is arranged on the inner wall of the longitudinal gas inlet pipeline, and a separation plate is arranged on the inner wall of an upwardly inclined section of the special-shaped gas inlet pipe. The atomization nozzle is arranged in the longitudinal gas inlet pipeline to form an atomized water layer which completely covers the section of the pipeline, so that pre-absorption treatment is performed on the hydrochloric acid gas before the hydrochloric acid gas enters the absorption tower, the purification difficulty of the absorption tower for the hydrochloric acid gas is reduced, the spiral plate is arranged to prolong the gas-liquid contact time and improve the pre-absorption effect, the special-shaped gas inlet pipe is arranged to separate the absorption liquid and particulate impurities carried in the hydrochloric acid gas, and the special-shaped gas inlet pipe is beneficial to maintaining the balance in the absorption tower and reducing the probability that the particulate impurities block the internal elements of the absorption tower.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, specifically to a hydrochloric acid gas treatment device and method based on pre-atomization absorption. Background Technology

[0002] In industrial production processes, hydrochloric acid gas is a common acidic waste gas. Direct emission of hydrochloric acid gas would cause serious environmental pollution. Therefore, hydrochloric acid gas needs to be purified before being discharged. Currently, conventional hydrochloric acid gas purification is mainly carried out in a spray tower, relying on the spray system inside the tower to absorb the acidic gas. However, when the initial concentration of hydrochloric acid gas is high, it is difficult to ensure the purification capacity of the absorption tower by absorbing the hydrochloric acid gas alone. Furthermore, the uneven distribution of hydrochloric acid gas in the absorption tower and the short contact time with the spray liquid both adversely affect the purification process of hydrochloric acid gas in the absorption tower, reducing the neutralization effect of the absorption treatment device on hydrochloric acid gas.

[0003] Patent document CN215463149U discloses a dual-pipe air-inlet acid mist absorption tower, which includes a neutralization tank, an adsorption cylinder, and a purification cylinder connected in sequence from bottom to top. Inside the cylinder of the adsorption cylinder, a high-pressure water inlet pipe, an intermediate packing layer, a medium-pressure water inlet pipe, a top packing layer, and a low-pressure water pipe are installed in sequence from bottom to top. A set of atomizing nozzles is installed on the high-pressure water inlet pipe, and a set of water spray nozzles is installed on the medium-pressure water inlet pipe and the low-pressure water inlet pipe. The purification cylinder is a truncated cone that is wider at the bottom and narrower at the top, with an air outlet pipe connected to the top.

[0004] The aforementioned patent documents improve the absorption efficiency and effect of the absorption tower for acid mist gas by adopting a dual-side air intake method. However, the absorption capacity of the absorption tower proposed in the aforementioned patent has not changed. When the concentration of acid gas is high, it is still difficult to fully neutralize and absorb the acid gas through the absorption tower. Summary of the Invention

[0005] The purpose of this invention is to provide a hydrochloric acid gas treatment device and method based on pre-atomization absorption to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hydrochloric acid gas treatment device based on pre-atomization absorption, comprising an absorption tower, an inlet and a pre-absorption module, wherein the pre-absorption module is connected to the absorption tower through the inlet.

[0007] The pre-absorption module includes a longitudinal air intake pipe, a shaped air intake pipe, and a liquid storage tank. The shaped air intake pipe is connected to one side of the longitudinal air intake pipe. The end of the shaped air intake pipe away from the longitudinal air intake pipe is connected to the air inlet. An annular main pipe is fitted on the outer wall of the longitudinal air intake pipe. An atomizing nozzle is installed on the inner wall of the annular main pipe and is located inside the longitudinal air intake pipe. A water pump is installed on the top of the liquid storage tank. The output end of the water pump is connected to an absorbent liquid delivery pipe, and the other end of the absorbent liquid delivery pipe is connected to the annular main pipe.

[0008] The inner wall of the longitudinal air intake pipe is equipped with a spiral plate, which is located below the atomizing nozzle. A separation plate is installed on the inner wall of the upward-sloping section of the irregularly shaped air intake pipe. A through hole is opened at the connection between the separation plate and the irregularly shaped air intake pipe. An acceleration unit is installed on the irregularly shaped air intake pipe to increase the flow rate of hydrochloric acid gas in the irregularly shaped pipe.

[0009] Preferably, the number of atomizing nozzles is 5, which are evenly distributed along the longitudinal direction on the inner wall of the longitudinal air intake pipe. The planar spray angle of the atomizing nozzles is not less than 36°, and the planar overlap rate of the atomizing areas of two adjacent atomizing nozzles is not less than 30%.

[0010] Preferably, the infusion tank contains an absorbent liquid with a pH value of 10, the working pressure of the atomizing nozzle is 0.3 to 0.5 MPa, and the absorbent liquid is sprayed out through the atomizing nozzle to form absorbent liquid atomized particles with a diameter of 50 to 100 μm.

[0011] Preferably, the absorption tower is equipped with a uniform distribution module, which includes multiple sets of concentric annular tubes and adjacent concentric annular tubes are connected by connecting pipes. The outermost set of concentric annular tubes is connected to the air inlet by connecting pipes. The top and bottom walls of the concentric annular tubes are evenly provided with uniform distribution holes.

[0012] Preferably, the absorption tower is equipped with a packing layer adjustment module and a spray frame, with the spray frame located above the packing layer adjustment module and the packing layer adjustment module located above the uniform distribution module.

[0013] The packing layer adjustment module includes a lower grid plate, a first corrugated packing plate, an upper grid plate, and a second corrugated packing plate. A concentration sensor is installed on the inner wall of the absorption tower, and the concentration sensor is located below the lower grid plate.

[0014] A lower grid plate is fixedly installed on the inner wall of the absorption tower. A first corrugated filler plate is installed on the top of the lower grid plate. An upper grid plate is slidably connected to the inner wall of the absorption tower, and the upper grid plate is located above the lower grid plate. A second corrugated filler plate is installed at the bottom of the upper grid plate, and the second corrugated filler plate is slidably connected to the first corrugated filler plate. A lead screw is installed through the top of the upper grid plate, and a worm gear is sleeved on the outer wall of the lead screw. The worm gear is located above the upper grid plate. An installation box is fixedly installed in the absorption tower. A servo motor is installed inside the installation box. The output end of the servo motor is connected to a worm, and the worm meshes with the worm gear. A protrusion is installed on the outer wall of the upper grid plate, and the protrusion is embedded in and connected to the inner wall of the absorption tower.

[0015] Preferably, the outer wall of the first corrugated filling plate is provided with a first through groove, the second corrugated filling plate is provided with a first connecting block on the side facing the first corrugated filling plate, one end of the first connecting block is connected to a first cleaning frame, and one side of the first cleaning frame is slidably connected to the first corrugated filling plate, the outer wall of the second corrugated filling plate is provided with a second through groove, the first corrugated filling plate is provided with a second connecting block on the side facing the second corrugated filling plate, one end of the second connecting block is connected to a second cleaning frame, and one side of the second cleaning frame is slidably connected to the second corrugated filling plate.

[0016] Preferably, a water tank is installed on the front of the absorption tower, a second water pump is installed on the top of the water tank, the output end of the second water pump is connected to a water supply pipe, and the water supply pipe is connected to the spray frame.

[0017] Preferably, the inner wall of the absorption tower is equipped with a demisting zone, which is located above the spray frame. The bottom of the absorption tower is connected to a discharge pipe, the outer wall of the discharge pipe is connected to a drain pipe, and the top of the drain pipe is connected to the bottom of the longitudinal air inlet pipe.

[0018] A method for treating hydrochloric acid gas based on pre-atomization absorption is as follows:

[0019] S1. The absorbent with a pH value of 10 is delivered to the atomizing nozzle, and an atomized water layer covering the cross section of the longitudinal air intake pipe is formed through the atomizing nozzle.

[0020] S2. The hydrochloric acid gas moves downward along the longitudinal intake pipe, passes through the atomized water layer, and comes into contact with the atomized water layer, causing the atomized water layer and hydrochloric acid gas to undergo a neutralization reaction, and then flows into the air inlet along the irregular intake pipe.

[0021] S3. Hydrochloric acid gas enters the uniform distribution module through the gas inlet, and is evenly distributed in the absorption tower through the concentric ring pipe.

[0022] S4. The spray rack sprays the spray liquid in the water tank onto the surface of the packing layer adjustment module. The hydrochloric acid gas flows upward in the absorption tower, so that the hydrochloric acid gas is neutralized and absorbed again with the spray liquid on the packing adjustment module.

[0023] S5. The concentration of acidic substances in hydrochloric acid gas is detected by a concentration sensor, and the overlap area of ​​the first corrugated filler plate and the second corrugated filler plate is adjusted according to the concentration.

[0024] Preferably, step S1 further includes the following steps:

[0025] S11. The flow rate of the absorbent is 5-8 L / min to ensure the continuity of the atomized water layer;

[0026] S2 also includes the following steps:

[0027] S21. The flow velocity of hydrochloric acid gas in the longitudinal intake pipe is controlled at 10-15 m / s.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. This invention utilizes a pre-absorption module and atomizing nozzles to form a complete absorbent liquid atomized water layer covering the cross-section of the longitudinal air inlet pipe. This atomized water layer performs pre-absorption treatment before the hydrochloric acid gas enters the absorption tower, reducing the purification difficulty of the absorption tower for hydrochloric acid gas and ensuring that the absorption tower can fully neutralize the hydrochloric acid gas. The spiral plate guides the flow of absorbent liquid and hydrochloric acid gas, which helps to prolong the gas-liquid contact time and improve the pre-absorption effect. The irregularly shaped air inlet pipe separates the absorbent liquid and particulate impurities carried in the hydrochloric acid gas, which helps to maintain the balance in the absorption tower and reduces the probability of particulate impurities clogging the internal components of the absorption tower, thereby improving the secondary absorption and neutralization effect of hydrochloric acid gas.

[0030] 2. This invention, by installing a uniform distribution unit, including a concentric annular pipe and uniform distribution holes, allows hydrochloric acid gas to undergo initial neutralization and absorption by the pre-absorption module, followed by a second spray neutralization and absorption treatment inside the absorption tower via the inlet. The uniform distribution module improves the uniformity of hydrochloric acid gas distribution in the absorption tower, avoiding gas flow deviation, concentrated flow, and dead zones, thus solving the problem of uneven gas distribution within the absorption tower and improving the effect of secondary neutralization and absorption treatment of hydrochloric acid gas in the absorption tower.

[0031] 3. This invention is equipped with a packing layer adjustment module. By setting a concentration sensor, the concentration of hydrochloric acid gas to be neutralized and absorbed in the absorption tower is detected. When the concentration of hydrochloric acid gas is high or the concentration of acidic substances in the gas is high, the servo motor drives the worm to rotate. Through the combined transmission of the worm wheel, worm and lead screw, the upper grid plate drives the second corrugated packing plate to move upward, which helps to prolong the contact time between hydrochloric acid gas and spray liquid, thereby improving the neutralization treatment effect of hydrochloric acid gas.

[0032] 4. By installing a first cleaning rack and a second cleaning rack, the present invention cleans the first corrugated packing plate and the second corrugated packing plate respectively when the packing layer adjustment module is adjusted in relative position. This prevents particulate matter carried in hydrochloric acid gas from accumulating on the surface of the first and second corrugated packing plates, reducing the adhesion or retention capacity of the absorbent liquid, preventing a decrease in the absorption effect of hydrochloric acid gas, and preventing the long-term accumulation of particulate impurities carried in hydrochloric acid gas. It also prevents the space between the relatively arranged first and second corrugated packing plates from being blocked, thereby avoiding affecting the smooth upward flow of hydrochloric acid gas and the smooth downward flow of the spray liquid, ensuring the smooth progress of the neutralization and absorption process of hydrochloric acid gas in the absorption tower. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 This is a schematic diagram of the front structure of the present invention;

[0035] Figure 3 This is a top view of the longitudinal air intake duct of the present invention;

[0036] Figure 4 This is a schematic diagram of the front structure of the filler layer adjustment module of the present invention;

[0037] Figure 5 This is a top view of the filler layer adjustment module of the present invention;

[0038] Figure 6 This is a top view of the first corrugated filler plate and the second corrugated filler plate of the present invention;

[0039] Figure 7 This is a perspective view of the first corrugated filler plate and the second corrugated filler plate of the present invention;

[0040] Figure 8 This is a schematic diagram of the front structure of the absorption tower of the present invention;

[0041] Figure 9 This is a top view of the uniformly distributed module of the present invention.

[0042] In the diagram: 1. Absorption tower; 2. Air inlet; 3. Longitudinal air inlet pipe; 4. Irregularly shaped air inlet pipe; 5. Liquid storage tank; 6. Water pump one; 7. Annular main pipe; 8. Atomizing nozzle; 9. Spiral plate; 10. Speed-increasing unit; 11. Separation plate; 12. Discharge pipe; 13. Concentric annular pipe; 14. Uniformly distributed holes; 15. Concentration sensor; 16. Packing layer adjustment module; 17. Spray frame; 18. Demisting zone; 19. Lower grid plate; 20. First corrugated filler plate; 21. Upper grid plate; 22. Second corrugated filler plate; 23. Lead screw; 24. Worm gear; 25. Mounting box; 26. Servo motor; 27. Worm gear; 28. First through slot; 29. ​​First connecting block; 30. First cleaning frame; 31. Second through slot; 32. Second connecting block; 33. Second cleaning frame; 34. Water tank; 35. Water pump two; 36. Water supply pipe. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] Please see Figure 1 , Figure 2 and Figure 3The present invention provides an embodiment of a hydrochloric acid gas treatment device based on pre-atomization absorption, comprising an absorption tower 1, an inlet 2 and a pre-absorption module. The pre-absorption module is connected to the absorption tower 1 through the inlet 2. Inlets 2 are provided on both sides of the absorption tower 1. The number of installation groups of the pre-absorption module is two, and the two groups of pre-absorption modules are symmetrically arranged on both sides of the absorption tower 1.

[0047] The pre-absorption module includes a longitudinal air inlet pipe 3, a shaped air inlet pipe 4, and a liquid storage tank 5. The shaped air inlet pipe 4 is connected to the side of the longitudinal air inlet pipe 3 closest to the absorption tower 1. The end of the shaped air inlet pipe 4 away from the longitudinal air inlet pipe 3 is connected to the air inlet 2. The shaped air inlet pipe 4 includes a first inclined upper section, a horizontal section, a first inclined lower section, and a second inclined upper section connected in sequence. The first inclined upper section is connected to the longitudinal air inlet pipe 3 and a one-way flow control valve is installed on the first inclined upper section. The second inclined upper section is connected to the air inlet 2. An annular main pipe 7 is sleeved on the outer wall of the longitudinal air inlet pipe 3. An atomizing nozzle 8 is installed on the inner wall of the annular main pipe 7 and is located inside the longitudinal air inlet pipe 3. A water pump 6 is installed on the top of the liquid storage tank 5. The output end of the water pump 6 is connected to the absorbent liquid delivery pipe, and the other end of the absorbent liquid delivery pipe is connected to the annular main pipe 7.

[0048] A spiral plate 9 is installed on the inner wall of the longitudinal air intake pipe 3, and the spiral plate 9 is located below the atomizing nozzle 8. The connection between the irregular air intake pipe 4 and the longitudinal air intake pipe 3 is located below the spiral plate 9. A separation plate 11 is installed on the inner wall of an upwardly inclined section of the irregular air intake pipe 4, that is, a separation plate 11 is installed in the second upwardly inclined section of the irregular air intake pipe 4. The separation plate 11 is inclined. A through hole is opened at the connection between the separation plate 11 and the irregular air intake pipe 4 so that the droplets sliding down the surface of the separation plate 11 can flow downward along the inner wall of the second upwardly inclined section. An acceleration unit 10 is installed on the irregular air intake pipe 4. The acceleration unit 10 includes at least one of a gas booster pump or a fan, thereby increasing the flow rate of hydrochloric acid gas in the irregular pipe.

[0049] The number of atomizing nozzles 8 is 5, which are evenly distributed along the longitudinal direction on the inner wall of the longitudinal air intake pipe 3. The planar spray angle of the atomizing nozzles 8 is not less than 36°, and the planar overlap rate of the atomizing areas of two adjacent atomizing nozzles 8 is not less than 30%.

[0050] Furthermore, by sequentially arranging atomizing nozzles 8 along the hydrochloric acid gas flow direction, collisions of the absorbent liquid droplets ejected from each group of atomizing nozzles 8 on the same horizontal plane are avoided, thus preventing a decrease in the flow velocity of the atomized droplets. This helps maintain the continuity of the atomized water layer formed by the atomized droplets and avoids eddies at the center of the atomized water layer, which helps ensure the integrity of the atomized water layer. By optimizing the planar spray angle and installation position of the atomizing nozzles 8, the atomization range of the absorbent liquid formed by the atomizing nozzles 8 can completely cover the cross-section of the longitudinal air intake pipe 3, avoiding dead zones in the pre-neutralization and absorption of hydrochloric acid gas.

[0051] The infusion tank contains absorbent liquid, which is recycled water with a pH of 10, thereby reducing the treatment cost of pre-atomized absorption and having good economic and environmental benefits. The working pressure of the atomizing nozzle 8 is 0.3-0.5 MPa. After the absorbent liquid is sprayed out through the atomizing nozzle 8, it forms absorbent liquid atomized particles with a diameter of 50-100 μm. The delivery flow rate of the pump is 5-8 L / min. The flow velocity of hydrochloric acid gas in the longitudinal air inlet pipe 3 is controlled at 10-15 m / s, and the contact time with the atomized water layer is not less than 0.5 s.

[0052] Furthermore, by regulating the flow rate of the absorbent, it is beneficial to ensure the continuity of the atomized water layer, which facilitates the provision of sufficient absorbent for the pre-absorption and neutralization of hydrochloric acid gas. By regulating the atomization pressure of the atomizing nozzle 8, the atomized particle diameter of the absorbent and the flow rate of hydrochloric acid gas in the longitudinal air inlet pipe 3 are controlled, so that the hydrochloric acid gas can fully contact the atomized water layer, thereby improving the absorption and neutralization effect of hydrochloric acid gas.

[0053] The absorbent in the storage tank 5 is pumped by water pump 6 at a flow rate of 5-8 L / min to the annular main pipe 7 and the atomizing nozzle 8. Water is sprayed at a set pressure by the atomizing nozzle 8, forming an atomized water layer that completely covers the cross-section of the longitudinal air intake pipe 3. The hydrochloric acid gas to be treated is then introduced into the longitudinal air intake pipe 3 at a flow rate of 10-15 m / s. The hydrochloric acid gas flows downwards through the atomized water layer. During the contact between the hydrochloric acid gas and the atomized water layer, the absorbent neutralizes and absorbs the hydrochloric acid gas. After passing through the atomized water layer, the gas continues to flow downwards and is atomized. After the water layer comes into contact with the longitudinal air intake pipe 3, it flows downward along the longitudinal air intake pipe 3. By setting a spiral plate 9 below the atomizing nozzle 8, the spiral plate 9 guides the flow of the absorbent liquid and hydrochloric acid gas, thereby prolonging the contact coexistence time between the absorbent liquid and hydrochloric acid gas and improving the pre-absorption effect of hydrochloric acid gas. Then, the hydrochloric acid gas enters the irregularly shaped air intake pipe 4. When the hydrochloric acid gas flows into the absorption tower 1 along the second inclined upper section of the pipe, the speed-increasing unit 10 increases the flow velocity of the hydrochloric acid gas by pressurizing or blowing in airflow, thereby enhancing the collision effect between the hydrochloric acid gas and the separation plate 11. The hydrochloric acid gas collides with the separation plate 11, causing a flow change in the gas. Simultaneously, absorbent particles slide downwards along the surface of the separation plate 11 and flow downwards through the through-holes at the bottom of the plate. The separated absorbent particles are collected at the bend of the shaped air inlet pipe 4. Through a connecting pipe, the collected absorbent is gathered at the bottom of the longitudinal air inlet pipe 3 and discharged together with the absorbent in the longitudinal air inlet pipe 3. By using the shaped air inlet pipe 4 and the separation plate 11, the humidity of the hydrochloric acid gas neutralized in the longitudinal air inlet pipe 3 is reduced, preventing moisture buildup during reabsorption. The hydrochloric acid gas carries a large amount of absorbent liquid into the absorption tower 1, thus avoiding affecting the gas-liquid ratio in the absorption tower 1 and consequently the absorption process within the absorption tower 1. Simultaneously, when the hydrochloric acid gas collides with the separation plate 11, the separation plate 11 can intercept any solid particles or other substances that may be carried in the hydrochloric acid gas, preventing the entry of excessive solid particulate impurities into the absorption tower 1 and thus preventing blockage of the structure within the absorption tower 1. This improves the re-neutralization effect of the hydrochloric acid gas and extends the service life of the hydrochloric acid gas treatment device.

[0054] Please see Figure 8 and Figure 9 The present invention provides an embodiment of a hydrochloric acid gas treatment device based on pre-atomization absorption, comprising an absorption tower 1 with a uniform distribution module installed inside, the uniform distribution module and the gas inlet 2 being set at the same horizontal position, the uniform distribution module comprising multiple sets of concentric annular tubes 13, adjacent concentric annular tubes 13 being connected by connecting pipes, and the distance between two adjacent sets of concentric annular tubes 13 being 5% to 8% of the cross-sectional radius of the absorption tower 1 where the uniform distribution module is installed, the outermost set of concentric annular tubes 13 being connected to the gas inlet 2 by connecting pipes, and uniform distribution holes 14 being uniformly opened on the top and bottom walls of the concentric annular tubes 13, the uniform distribution holes 14 being used to distribute hydrochloric acid gas into the absorption tower.

[0055] Furthermore, the hydrochloric acid liquid, after initial neutralization and absorption treatment by the pre-absorption module, enters the absorption tower 1 through the gas inlet 2. By setting multiple sets of concentric annular pipes 13 and uniformly distributed holes 14, the hydrochloric acid gas is uniformly diffused in the absorption tower 1, avoiding gas flow deviation, concentrated flow and dead zone phenomena. This solves the problem of uneven distribution of the gas to be treated in the absorption tower 1 and improves the effect of secondary neutralization and absorption treatment of hydrochloric acid gas in the absorption tower 1.

[0056] Please see Figure 4 , Figure 5 and Figure 8 The present invention provides an embodiment of a hydrochloric acid gas treatment device based on pre-atomization absorption, comprising an absorption tower 1 with a packing layer adjustment module 16 and a spray rack 17 installed inside the absorption tower 1. The spray rack 17 is located above the packing layer adjustment module 16. Both the packing layer adjustment module 16 and the spray rack 17 are installed in two sets, sequentially arranged inside the absorption tower 1. The packing layer adjustment module 16 is located above the uniform distribution module. A concentration sensor 15 is installed on the inner wall of the absorption tower 1, and the concentration sensor 15 is located below the lower grid plate 19. The concentration sensor 15 is used to detect the concentration of hydrochloric acid gas or the concentration of acidic substances in the gas. Alternatively, an acid-base detection sensor is installed on the inner wall of the absorption tower to detect the pH value of the hydrochloric acid gas.

[0057] The packing layer adjustment module 16 includes a lower grid plate 19, a first corrugated packing plate 20, an upper grid plate 21, and a second corrugated packing plate 22. The lower grid plate 19 is fixedly installed on the inner wall of the absorption tower 1. The first corrugated packing plate 20 is installed on top of the lower grid plate 19. The upper grid plate 21 is slidably connected to the inner wall of the absorption tower 1, located above the lower grid plate 19. The second corrugated packing plate 22 is installed at the bottom of the upper grid plate 21, and is slidably connected to the first corrugated packing plate 20. A lead screw 23 is installed through the top of the upper grid plate 21. Near the inner wall of the absorption tower 1, a worm gear 24 is fitted on the outer wall of the lead screw 23. The worm gear 24 is located near the top of the lead screw 23. Both the top of the lead screw 23 and the worm gear 24 are located below the spray frame 17. The worm gear 24 is located above the upper grid plate 21. The absorption tower 1 is fixedly equipped with an installation box 25. A servo motor 26 is installed inside the installation box 25. The output end of the servo motor 26 is connected to a worm 27, and the worm 27 meshes with the worm gear 24. A protrusion is installed on the outer wall of the upper grid plate 21, and the protrusion is embedded in and connected to the inner wall of the absorption tower 1. The protrusion is used to provide movement guidance and limit the upper grid plate 21.

[0058] Furthermore, the spray rack 17 sprays an alkaline spray liquid onto the packing layer adjustment module 16 for further absorption and neutralization of hydrochloric acid gas. The spray liquid covers the surfaces of the first corrugated packing plate 20 and the second corrugated packing plate 22. The hydrochloric acid gas, which is uniformly distributed in the absorption tower 1, flows upward in the absorption tower 1 and neutralizes and absorbs the spray liquid on the surfaces of the first corrugated packing plate 20 and the second corrugated packing plate 22, thereby achieving further purification of the hydrochloric acid gas.

[0059] Before the hydrochloric acid gas comes into contact with the packing layer adjustment module 16, the concentration of hydrochloric acid gas is detected by the concentration sensor 15. Based on the detection result, the relative positions of the first corrugated packing plate and the second corrugated packing plate 22 are adjusted. For example, when the concentration of hydrochloric acid gas is high or the content of acidic substances is high, the servo motor 26 drives the worm 27 to rotate. The worm 27 meshes with the worm wheel 24, which drives the worm wheel 24 to rotate. The worm wheel 24 drives the lead screw 23 to rotate, which in turn drives the upper grid plate 21 to slide upward along the inner wall of the absorption tower 1, and drives the second corrugated packing plate 22 to slide upward along the surface of the first corrugated packing plate 20. This increases the area of ​​the hydrochloric acid gas neutralization and absorption area composed of the first corrugated packing plate 20 and the second corrugated packing plate 22, prolonging the contact time between the hydrochloric acid gas and the spray liquid, which helps to improve the neutralization treatment effect of the hydrochloric acid gas. At the same time, by setting the packing layer adjustment module 16, it is not necessary to replace the packing layer according to the different concentrations of hydrochloric acid to be treated, which improves the ease of use of the hydrochloric acid gas treatment device.

[0060] Furthermore, a hydrophilic coating is provided on the surfaces of the first corrugated filler plate 20 and the second corrugated filler plate 22, which helps to improve the retention effect of the spray liquid on the surfaces of the first corrugated filler plate 20 and the second corrugated filler plate 22, ensuring that there is sufficient spray liquid on the surfaces of the first corrugated filler plate 20 and the second corrugated filler plate 22 to neutralize and absorb the hydrochloric acid gas again. At the same time, it helps to extend the contact time between the hydrochloric acid gas and the spray liquid, further improving the hydrochloric acid gas treatment effect.

[0061] Please see Figure 6 and Figure 7 An embodiment of the present invention provides a hydrochloric acid gas treatment device based on pre-atomization absorption, comprising a first through groove 28 penetrating the outer wall of a first corrugated filling plate 20, a first connecting block 29 installed on the side of a second corrugated filling plate 22 facing the first corrugated filling plate 20, a first cleaning rack 30 connected to one end of the first connecting block 29, and a side of the first cleaning rack 30 slidably connected to the first corrugated filling plate 20, a second through groove 31 penetrating the outer wall of the second corrugated filling plate 22, a second connecting block 32 installed on the side of the first corrugated filling plate 20 facing the second corrugated filling plate 22, a second cleaning rack 33 connected to one end of the second connecting block 32, and a side of the second cleaning rack 33 slidably connected to the second corrugated filling plate 22;

[0062] Specifically, when the first corrugated filler plate 20 is convex towards the second corrugated filler plate 22, a first through groove 28 is longitudinally provided at the outer convex peak position. The outer wall of the first connecting block 29 is slidably connected to the inner wall of the through groove. The two ends of the first connecting block 29 are respectively connected to the second corrugated filler plate 22 and the first cleaning rack 30. The fixed connection between the first connecting block 29 and the second corrugated filler plate 22 is close to the bottom of the second corrugated filler plate 22. The second cleaning rack 33 and the second corrugated filler plate 22 are respectively located on both sides of the first corrugated filler plate 20. The first cleaning rack 30 is provided with a bristle on the side close to the first corrugated filler plate 20. The brush body is used to clean the first corrugated filling plate 20. When the side of the first corrugated filling plate 20 facing the second corrugated filling plate 22 is concave, a second connecting block 32 is installed at the concave peak and valley of the first corrugated filling plate 20. The second connecting block 32 is close to the top of the second corrugated filling plate 22. At the same time, a second through groove 31 is longitudinally opened at the corresponding position of the second corrugated filling plate 22. The second connecting block 32 passes through the inner wall of the second through groove 31. The end of the second connecting block 32 away from the first corrugated filling plate 20 is connected to a second cleaning frame 33, and one side of the second cleaning frame 33 is slidably connected to the second corrugated filling plate 22.

[0063] Furthermore, when the filler layer adjustment module 16 adjusts the relative positions of the first corrugated filler plate 20 and the second corrugated filler plate 22, the second corrugated filler plate 22 drives the first connecting block 29 to move upward, causing the first connecting block 29 to drive the first cleaning plate to move upward along the outer wall of the second corrugated connecting plate, cleaning the first corrugated filler plate 20 through the brush body. At the same time, the second connecting block 32 slides downward relative to the inner wall of the second through groove 31, causing the second cleaning plate to move downward relative to the second corrugated filler plate 22, cleaning the second corrugated filler plate 22 through the brush body. Cleaning is performed to prevent particulate matter carried in the hydrochloric acid gas from accumulating on the surfaces of the first corrugated packing plate 20 and the second corrugated packing plate 22, reducing the adhesion or retention capacity of the absorbent liquid, preventing a decrease in the absorption effect of hydrochloric acid gas, and preventing the long-term accumulation of particulate impurities carried in the hydrochloric acid gas. This also prevents the space between the relatively arranged first corrugated packing plate 20 and the second corrugated packing plate 22 from being blocked, thereby avoiding affecting the smooth upward flow of hydrochloric acid gas and the smooth downward flow of the spray liquid, and ensuring the smooth progress of the neutralization and absorption process of hydrochloric acid gas in the absorption tower 1.

[0064] Please see Figure 1 , Figure 2 and Figure 8An embodiment of the present invention provides a hydrochloric acid gas treatment device based on pre-atomization absorption, comprising an absorption tower 1 with a water tank 34 installed on the front, a water pump 35 installed on the top of the water tank 34, the output end of the water pump 35 being connected to a water pipe 36, and the water pipe 36 being connected to a spray frame 17. The water tank 34 contains an alkaline spray liquid for further spraying and neutralizing the hydrochloric acid gas. The water pump 35 transports the alkaline spray liquid in the water tank 34 to the spray frame 17 through the water pipe 36. The spray frame 17 evenly sprays the spray liquid onto the packing layer adjustment module 16 for secondary neutralization and absorption reaction between the spray liquid and the hydrochloric acid gas in the packing layer adjustment module 16.

[0065] The inner wall of the absorption tower 1 is equipped with a demisting zone 18, which is located above the spray frame 17. The demisting zone 18 is equipped with a wire mesh demister. By setting up the demisting zone 18, water mist in the purified hydrochloric acid gas that is about to be discharged from the absorption tower 1 is removed, so as to avoid the phenomenon of gas carrying liquid droplets being directly discharged from the absorption tower 1, which is conducive to improving the environmental protection effect.

[0066] The bottom of the absorption tower 1 is provided with a discharge pipe 12, and the bottom end of the longitudinal air inlet pipe 3 is provided with a drain pipe, and the bottom end of the drain pipe is connected to the discharge pipe. Both the discharge pipe 12 and the drain pipe are provided with one-way drain valves. The bottom end of the discharge pipe 12 is connected to the waste liquid treatment system of the absorption tower 1, so as to facilitate the transfer of the used absorption liquid in the longitudinal air inlet pipe 3 and the used spray liquid in the absorption tower 1 to the waste liquid treatment system for neutralization treatment.

[0067] Working principle: The absorbent with a pH of 10 is delivered to the atomizing nozzle 8, which forms an atomized water layer covering the cross-section of the longitudinal air inlet pipe 3. The hydrochloric acid gas moves downward along the longitudinal air inlet pipe 3, passes through the atomized water layer, and comes into contact with the atomized water layer, causing the atomized water layer to neutralize the hydrochloric acid gas. Then, it flows into the air inlet 2 along the irregular air inlet pipe 4. The hydrochloric acid gas enters the uniform distribution module through the air inlet 2 and is evenly distributed in the absorption tower 1 by the concentric annular pipe 13. The concentration of acidic substances in the hydrochloric acid gas is detected by the concentration sensor 15. The overlap area of ​​the first corrugated packing plate 20 and the second corrugated packing plate 22 is adjusted according to the concentration. The spray frame 17 sprays the spray liquid in the water tank 34 onto the surface of the packing layer adjustment module 16. The hydrochloric acid gas flows upward in the absorption tower 1, so that the hydrochloric acid gas is neutralized and absorbed again by the spray liquid on the packing adjustment module.

[0068] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A hydrochloric acid gas treatment device based on pre-atomization absorption, characterized in that, It includes an absorption tower (1), an air inlet (2) and a pre-absorption module, wherein the pre-absorption module is connected to the absorption tower (1) through the air inlet (2); The pre-absorption module includes a longitudinal air intake pipe (3), a shaped air intake pipe (4), and a liquid storage tank (5). The shaped air intake pipe (4) is connected to one side of the longitudinal air intake pipe (3). The end of the shaped air intake pipe (4) away from the longitudinal air intake pipe (3) is connected to the air inlet (2). The outer wall of the longitudinal air intake pipe (3) is fitted with an annular main pipe (7). The inner wall of the annular main pipe (7) is fitted with an atomizing nozzle (8), and the atomizing nozzle (8) is located inside the longitudinal air intake pipe (3). A water pump (6) is installed on the top of the liquid storage tank (5). The output end of the water pump (6) is connected to the absorbent liquid delivery pipe, and the other end of the absorbent liquid delivery pipe is connected to the annular main pipe (7). The inner wall of the longitudinal air intake pipe (3) is equipped with a spiral plate (9), and the spiral plate (9) is located below the atomizing nozzle (8). The irregular air intake pipe (4) includes a first inclined upper section, a horizontal section, a first inclined lower section and a second inclined upper section connected in sequence. The first inclined upper section is connected to the longitudinal air intake pipe (3), and the second inclined upper section is connected to the air inlet (2). The inner wall of the second inclined upper section is equipped with an inclined separation plate (11). A through hole is opened at the connection between the separation plate (11) and the irregular air intake pipe (4). An acceleration unit (10) is installed on the irregular air intake pipe (4). The acceleration unit (10) is used to increase the flow rate of hydrochloric acid gas in the irregular pipe.

2. The hydrochloric acid gas treatment device based on pre-atomization absorption according to claim 1, characterized in that: The number of atomizing nozzles (8) is 5, which are evenly distributed along the longitudinal direction on the inner wall of the longitudinal air intake pipe (3). The planar spray angle of the atomizing nozzles (8) is not less than 36°, and the planar overlap rate of the atomizing areas of two adjacent atomizing nozzles (8) is not less than 30%.

3. The hydrochloric acid gas treatment device based on pre-atomization absorption according to claim 2, characterized in that: The storage tank (5) contains an absorbent liquid with a pH value of 10. The working pressure of the atomizing nozzle (8) is 0.3 to 0.5 MPa. After the absorbent liquid is sprayed out through the atomizing nozzle (8), it forms absorbent liquid atomized particles with a diameter of 50 to 100 μm.

4. The hydrochloric acid gas treatment device based on pre-atomization absorption according to claim 1, characterized in that: The absorption tower (1) is equipped with a uniform distribution module, which includes multiple sets of concentric annular tubes (13), and adjacent concentric annular tubes (13) are connected by connecting pipes. The outermost set of concentric annular tubes (13) is connected to the air inlet (2) by connecting pipes. The top and bottom walls of the concentric annular tubes (13) are uniformly provided with uniform distribution holes (14).

5. The hydrochloric acid gas treatment device based on pre-atomization absorption according to claim 1, characterized in that: The absorption tower (1) is equipped with a packing layer adjustment module (16) and a spray rack (17). The spray rack (17) is located above the packing layer adjustment module (16), and the packing layer adjustment module (16) is located above the uniform distribution module. The packing layer adjustment module (16) includes a lower grid plate (19), a first corrugated packing plate (20), an upper grid plate (21), and a second corrugated packing plate (22). A concentration sensor (15) is installed on the inner wall of the absorption tower (1), and the concentration sensor (15) is located below the lower grid plate (19). A lower grid plate (19) is fixedly installed on the inner wall of the absorption tower (1). A first corrugated filler plate (20) is installed on the top of the lower grid plate (19). An upper grid plate (21) is slidably connected to the inner wall of the absorption tower (1). The upper grid plate (21) is located above the lower grid plate (19). A second corrugated filler plate (22) is installed at the bottom of the upper grid plate (21), and the second corrugated filler plate (22) is slidably connected to the first corrugated filler plate (20). A through-hole is installed on the top of the upper grid plate (21). There is a lead screw (23), and a worm gear (24) is sleeved on the outer wall of the lead screw (23). The worm gear (24) is located above the upper grid plate (21). An installation box (25) is fixedly installed on the outer wall of the absorption tower (1). A servo motor (26) is installed inside the installation box (25). The output end of the servo motor (26) is connected to a worm (27), and the worm (27) meshes with the worm gear (24). A protrusion is installed on the outer wall of the upper grid plate (21), and the protrusion is embedded and connected to the inner wall of the absorption tower (1).

6. The hydrochloric acid gas treatment device based on pre-atomization absorption according to claim 5, characterized in that: The outer wall of the first corrugated filling plate (20) is provided with a first through groove (28). The second corrugated filling plate (22) is provided with a first connecting block (29) on the side facing the first corrugated filling plate (20). One end of the first connecting block (29) is connected to a first cleaning rack (30), and one side of the first cleaning rack (30) is slidably connected to the first corrugated filling plate (20). The outer wall of the second corrugated filling plate (22) is provided with a second through groove (31). The side of the first corrugated filling plate (20) facing the second corrugated filling plate (22) is provided with a second connecting block (32). One end of the second connecting block (32) is connected to a second cleaning rack (33), and one side of the second cleaning rack (33) is slidably connected to the second corrugated filling plate (22).

7. The hydrochloric acid gas treatment device based on pre-atomization absorption according to claim 4, characterized in that: A water tank (34) is installed on the front of the absorption tower (1), and a water pump (35) is installed on the top of the water tank (34). The output end of the water pump (35) is connected to a water supply pipe (36), and the water supply pipe (36) is connected to the spray frame (17).

8. The hydrochloric acid gas treatment device based on pre-atomization absorption according to claim 7, characterized in that: The inner wall of the absorption tower (1) is equipped with a demisting zone (18), and the demisting zone (18) is located above the spray frame (17). The bottom of the absorption tower (1) is connected to a discharge pipe (12), the outer wall of the discharge pipe (12) is connected to a drain pipe, and the top of the drain pipe is connected to the bottom of the longitudinal air inlet pipe (3).

9. A method for treating hydrochloric acid gas based on pre-atomization absorption, applicable to the hydrochloric acid gas treatment device based on pre-atomization absorption as described in claim 1, characterized in that, The method for treating hydrochloric acid gas is as follows: S1. An absorbent with a pH of 10 is delivered to an atomizing nozzle (8) to form an atomized water layer covering the cross section of the longitudinal air intake pipe (3). S2. The hydrochloric acid gas moves downward along the longitudinal air inlet pipe (3), passes through the atomized water layer, and comes into contact with the atomized water layer, so that the atomized water layer and the hydrochloric acid gas undergo a neutralization reaction, and then flows into the air inlet (2) along the irregular air inlet pipe (4). S3. Hydrochloric acid gas enters the uniform distribution module through the gas inlet (2) and is evenly distributed in the absorption tower (1) through the concentric ring pipe (13). S4. The spray rack (17) sprays the spray liquid in the water tank (34) onto the surface of the packing layer adjustment module (16). The hydrochloric acid gas flows upward in the absorption tower (1), so that the hydrochloric acid gas is neutralized and absorbed again by the spray liquid on the packing adjustment module. S5. The concentration of acidic substances in hydrochloric acid gas is detected by the concentration sensor (15), and the overlap area of ​​the first corrugated filling plate (20) and the second corrugated filling plate (22) is adjusted according to the concentration.

10. A method for treating hydrochloric acid gas based on pre-atomization absorption according to claim 9, characterized in that, S1 also includes the following steps: S11. The flow rate of the absorbent is 5-8 L / min to ensure the continuity of the atomized water layer; S2 also includes the following steps: S21. The flow velocity of hydrochloric acid gas in the longitudinal intake pipe (3) is controlled to be 10-15 m / s.

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