Flue gas washing tower

Abstract

The invention relates to the field of separation, in particular to a flue gas washing tower which comprises a tower body, a gas outlet used for discharging purified clean flue gas is formed in the upper end of the tower body, a gas inlet channel is communicated with the lower side of the tower body, a washing water pipeline is further fixedly communicated with the outside of the tower body, and the bottom of the tower body is in a cone shape and communicated with a washing water outlet. The washing water pipeline is connected into the tower body, a plurality of nozzles are also mounted and limited in the tower body, the nozzles are uniformly distributed along the cross section of the tower body, a grid plate is arranged in the tower body corresponding to the lower sides of the nozzles, a filler is placed on the grid plate to form a filler layer or a turbulent ball layer for guiding gas and liquid phases to be fully contacted and mixed, and a demister is arranged at the top of the tower body; through the collaborative design of the rectifying cylinder and the guide fan blades, flue gas enters the tower body in a tangential rotation mode, the residence time of the flue gas in the tower is remarkably prolonged, meanwhile, the stability of rotating airflow under different flow working conditions is ensured through the self-adaptive rotating speed adjusting function of the guide fan blades, and favorable conditions are created for efficient contact of gas and liquid phases.

Description

Technical Field

[0001] This invention relates to the field of separation, and in particular to a flue gas scrubbing tower. Background Technology

[0002] In industrial production processes such as brine purification and salt production, boiler flue gas often contains pollutants such as dust and sulfur dioxide, and is produced at high temperatures. Directly introducing this gas into the brine purification system can affect the purity of the brine and cause scaling and blockage of the equipment. Direct discharge, on the other hand, does not meet environmental protection requirements. Flue gas scrubbers, as key equipment in wet flue gas purification, achieve flue gas cooling, dust removal, and desulfurization through counter-current gas-liquid contact, meeting the requirements of subsequent processes and environmental emissions. They are core supporting equipment in brine purification workshops. However, in existing flue gas scrubbers, salt and impurities easily crystallize and scale at the packing and spray nozzles during the scrubbing process, leading to decreased equipment efficiency and making it difficult to meet increasingly stringent environmental requirements and the actual needs of industrial production.

[0003] With the development of technology, technicians in related fields have also made a lot of optimizations to the technical means used for flue gas purification. For a more accurate comparison, the wet flue gas scrubbing tower disclosed in Chinese Patent No. CN107617289A includes an outlet section, an upper separation cone shell, a separation section, a lower separation cone shell, and a water collector. In use, the high-temperature flue gas containing insoluble particulate matter enters the equipment through the flue gas inlet at the bottom of the section. Cooling and dust removal water is sprayed from top to bottom. The flue gas flows from bottom to top through three ceramic Raschig rings for dust removal and cooling, and then flows through the water collector for deflection and collision with the water collector blades. The vapor mist forms droplets that fall down. The flue gas continues to rise and collides again with the swirling cone shell at the top of the tank. Finally, the flue gas passes through the flue gas outlet to the next process, while the droplets flow through the walls of the lower and middle separation cone shells to the bottom of the equipment.

[0004] However, the above-mentioned scrubbing tower technology still has some shortcomings in practical use: The aforementioned existing technology sprays water from top to bottom onto the packing layer, creating a counter-current contact with the flue gas flowing upwards. However, it fails to effectively guide the downward-spraying water mist or the upward-dispersing flue gas, easily leading to short gas-liquid two-phase contact time and insufficient mixing. This makes it difficult to effectively capture some fine particles, thus requiring further improvement in dust removal efficiency. Furthermore, the water collector only separates steam and water through baffles and blade collisions, which has a weak ability to capture smaller droplets. This may cause some water vapor to be carried away with the flue gas, wasting water resources and potentially adversely affecting subsequent processes.

[0005] Therefore, based on the above-stated viewpoints, there is still room for improvement in existing flue gas scrubbing tower technology for brine treatment. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a flue gas scrubbing tower, comprising a tower body. The upper end of the tower body has an outlet for discharging purified flue gas. An air inlet channel is connected to the lower side of the tower body. A scrubbing water pipe is fixedly connected to the outside of the tower body. The bottom of the tower body is tapered and connected to a scrubbing water outlet. Several nozzles are installed and positioned within the scrubbing water pipe inside the tower body. The nozzles are evenly distributed along the cross-section of the tower body. A grid plate is installed inside the tower body corresponding to the lower side of the nozzles. The grid plate is used to place packing material to form a packing layer or turbulent sphere layer that guides the full contact and mixing of the gas and liquid phases. A demister is installed at the top of the tower body to capture fine droplets in the flue gas. The air inlet channel is located on the lower side wall of the tower body and extends into the tower body, connecting to a rectifier cylinder. The rectifier cylinder extends upwards along the axial direction of the tower body. Several exhaust holes are evenly distributed on the upper side of the rectifier cylinder, and the exhaust holes are tangentially connected to the inner cavity of the tower body.

[0007] Preferably, the tower body is limited by a guide plate located on the upper side of the rectifier cylinder, and the guide plate is provided with several guide holes for the flue gas to pass through. The washing water pipe also extends corresponding to the guide plate and is equipped with several nozzles.

[0008] Preferably, the guide holes on the guide plate are configured as gradient holes.

[0009] Preferably, the distribution density of the plurality of guide holes on the guide plate is also set in a gradual manner.

[0010] Preferably, the nozzles on the washing water pipe corresponding to the packing layer or turbulent ball layer are hollow cone nozzles, while the nozzles on the washing water pipe corresponding to the guide plate are solid cone nozzles.

[0011] Preferably, the rectifier cylinder has guide blades that limit the rotation of several exhaust holes.

[0012] Preferably, the demister includes a separation block located inside the tower body above the packing layer or turbulent sphere layer, and the separation block is uniformly provided with a plurality of baffle holes.

[0013] Preferably, the lower side of the separation block is further limited by a grid plate that abuts against the inner wall of the tower. The grid plate is spaced apart from the separation block, and a drive rod is fixedly inserted through the middle of the grid plate.

[0014] Preferably, the upper side of the separation block is also spaced and limited by a grid plate that abuts against the inner wall of the tower, and the driving rod passes through the separation block and simultaneously drives the two grid plates on the upper and lower sides of the separation block to rotate.

[0015] In summary, this application includes at least one of the following beneficial technical effects: I. This invention, through the coordinated design of the rectifier and the guide fan blades, enables the flue gas to enter the tower in a tangential rotation manner, which significantly prolongs the residence time of the flue gas in the tower. At the same time, the adaptive speed adjustment function of the guide fan blades ensures the stability of the rotating airflow under different flow conditions, creating favorable conditions for efficient gas-liquid two-phase contact.

[0016] Second, this invention effectively compensates for the inherent radial velocity difference of the rotating airflow through the dual optimization configuration of the gradual aperture and the gradual distribution density on the guide plate, and realizes the homogenization of gas-liquid contact in the pre-humidification and cooling stage. This avoids the flow deviation phenomenon of excessive humidification in the central area and insufficient humidification in the edge area that is common in traditional scrubbing towers, and improves the overall efficiency of pre-purification treatment.

[0017] Third, this invention, through the coordinated operation of the guide fan blades, drive rod, and adjusting spring, drives the grid plate to rotate and adjust by outputting the flue gas in the rectifier cylinder. It can automatically adjust the working state of the demister according to the flue gas flow fluctuation without additional power input, simplifying the equipment structure, reducing operating energy consumption, and improving the system's adaptability and reliability. By adjusting the rotation of the grid plate, it not only suppresses gas turbulence in the tower, but also enhances the ability to capture and separate fine droplets, significantly reducing the amount of droplets entrained in the purified flue gas. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the internal structure of the tower body of the present invention.

[0021] Figure 3 This is a schematic diagram of the rectifier cylinder of the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of the guide plate of the present invention.

[0023] Figure 5 This is a schematic diagram of the exhaust port structure of the present invention.

[0024] Figure 6 This is a schematic diagram of the demister of the present invention.

[0025] Figure 7 This is a schematic diagram of the structure of the separation block of the present invention.

[0026] Figure 8 This is the present invention. Figure 7 A magnified view of A in the middle.

[0027] Figure 9 This is a schematic diagram of the structure of the drive lever of the present invention.

[0028] In the diagram, 1 is the tower body; 10 is the air outlet; 11 is the air inlet channel; 2 is the washing water pipe; 20 is the washing water outlet; 21 is the nozzle; 3 is the grid plate; 4 is the demister; 40 is the separator; 41 is the baffle; 42 is the grid plate; 43 is the drive rod; 430 is the active rod; 431 is the driven rod; 432 is the connecting rod; 433 is the adjusting spring; 5 is the rectifier cylinder; 50 is the exhaust port; 51 is the guide plate; 510 is the guide hole; and 52 is the guide fan blade. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1 To be continued Figure 9 The embodiments of the present invention will be described in detail below.

[0030] This application discloses a flue gas scrubbing tower to solve the problems in existing flue gas scrubbing tower technology, which are caused by the lack of effective guidance for the flow path of flue gas, resulting in insufficient contact time between the downward sprayed water mist and the upward flowing flue gas, leading to low gas-liquid two-phase mass transfer efficiency, and the difficulty in effectively separating liquid droplets entrained in the scrubbed gas, which can easily have an adverse effect on subsequent processes.

[0031] Example 1: Refer to Figures 1 to 3 As shown, a flue gas scrubbing tower includes a tower body 1. The bottom of the tower body 1 is fixed to an external foundation via a cylindrical skirt. An outlet 10 for discharging purified flue gas is located at the upper end of the tower body 1. An air inlet channel 11 is connected to the lower side of the tower body 1. A scrubbing water pipe 2 is also fixedly connected to the outside of the tower body 1. The bottom of the tower body 1 is tapered and connected to a scrubbing water outlet 20. Several nozzles 21 are installed inside the scrubbing water pipe 2, and these nozzles are evenly distributed along the cross-section of the tower body 1 to ensure that the scrubbing water fully covers the flue gas circulation area, forming a uniform and fine scrubbing water layer. The water mist layer is provided inside the tower body 1, and a grid plate 3 is set on the lower side of the nozzle 21. The grid plate 3 is used to place packing to form a packing layer or turbulent ball layer to guide the gas and liquid phases to fully contact and mix. The packing layer can use Pall ring packing or the turbulent ball layer can use packing balls to ensure full contact between the gas and liquid phases. Several manholes (not shown in the figure) are also provided on the tower body 1. The manholes (not shown in the figure) are arranged at equal intervals along the height direction of the tower body 1, and correspond to the maintenance work area inside the tower body 1, so as to facilitate the operators to perform packing replacement, nozzle cleaning and equipment maintenance inside the tower body 1.

[0032] A demister 4 is installed at the top of the tower body 1 to capture fine droplets in the flue gas, reduce the moisture content of the flue gas, and prevent the discharged flue gas from carrying droplets that may affect subsequent use.

[0033] The air intake channel 11 is located on the lower side wall of the tower body 1 and extends into the tower body 1 to connect with the rectifier cylinder 5. The rectifier cylinder 5 extends upward along the axial direction of the tower body 1. Several exhaust holes 50 are evenly opened on the upper side of the rectifier cylinder 5. The exhaust holes 50 are tangentially connected to the inner cavity of the tower body 1 so that the flue gas to be treated is tangentially input into the tower body 1 to form a rotating airflow, which prolongs the residence time of the flue gas in the tower and enhances the gas-liquid mixing effect.

[0034] Reference Figure 2 , Figure 4 and Figure 6 As shown, a guide plate 51 located on the upper side of the rectifier cylinder 5 is limited inside the tower body 1. Several guide holes 510 for allowing flue gas to pass through are opened on the guide plate 51. The washing water pipe 2 also extends corresponding to the guide plate 51 and is equipped with several nozzles 21. In operation, after the flue gas to be treated is introduced into the scrubbing tower, the flue gas is first guided by the rectifier 5 to form a rotating airflow that rises upward within the tower body 1. At the same time, water mist is sprayed into the tower body 1 through the washing water pipe 2 and several nozzles 21. The water mist sinks downward due to gravity and comes into contact with the rising rotating airflow, so that the flue gas to be treated is pre-humidified and cooled. Then, it rises and passes through the packing layer to further undergo mass and heat transfer reactions with the washing water. Acidic gases, dust particles, and harmful components in the flue gas are effectively captured and absorbed by the water mist. After being deeply purified by the packing layer, the flue gas continues to rise and achieves gas-liquid separation at the demister 4. The clean, low-temperature flue gas is finally discharged from the outlet 10 at the top of the tower body 1, while the washing water containing pollutants gathers at the conical constriction at the bottom of the tower body 1 and is discharged through the washing water outlet 20 for further treatment or recycling.

[0035] Furthermore, referring to Figure 4 and Figure 6As shown, in order to improve the gas-liquid contact effect, a number of guide holes 510 on the guide plate 51 are set as gradient holes. Specifically, the diameter of the guide hole 510 gradually decreases as its radial distance relative to the guide plate 51 increases. That is, the diameter of the guide hole 510 is larger closer to the center area of ​​the guide plate 51 and smaller closer to the edge area of ​​the guide plate 51. In operation, the flue gas, after being rectified by the rectifier 5 to form a rotating upward airflow, first impacts the lower surface of the guide plate 51. Due to the characteristic of the rotating airflow having a lower velocity in the central region and a higher velocity in the peripheral region, the larger guide holes 510 in the central region of the guide plate 51 reduce the local resistance of the flue gas flow, allowing the low-velocity airflow to pass smoothly and be evenly dispersed. The smaller guide holes 510 in the peripheral region moderately throttle the high-velocity airflow, increasing the turbulence of the gas and liquid phases in this region. This achieves equalization of the gas-liquid contact time across the entire cross-section of the guide plate 51, ensuring that the initial flue gas is uniformly pre-humidified and cooled. Simultaneously, under the rectifying effect of the guide holes 510, the rotating airflow is divided into multiple evenly distributed direct currents or weak swirling flows, entering the packing layer region in a more stable state. This retains the enhanced gas-liquid mixing effect brought by the rotating airflow while avoiding flooding or channeling caused by excessively high local airflow velocities, ensuring balanced load across the packing layer and improving overall mass transfer efficiency.

[0036] Reference Figure 4 and Figure 6 As shown, the distribution density of the guide holes 510 on the guide plate 51 is also gradually varied. Specifically, the distribution density of the guide holes 510 gradually decreases as their radial distance relative to the guide plate 51 increases. That is, there are more guide holes 510 per unit area in the central region of the guide plate 51, and fewer guide holes 510 per unit area in the edge region. This works in conjunction with the gradual distribution of the guide hole 510 size: the larger guide holes 510 in the central region, combined with the higher distribution density, provide sufficient flow channels for low-speed airflow, ensuring smooth and uniform airflow in this region; the smaller guide holes 510 in the edge region, combined with the lower distribution density, moderately restrict the flow rate of high-speed airflow while extending the contact path and reaction time of the gas and liquid phases in the edge region. By using this dual gradual control of aperture and distribution density, the problem of uneven gas-liquid contact caused by radial velocity differences in the rotating airflow is effectively compensated. At the same time, the rotating airflow entering the tower body 1 is guided to be evenly distributed after passing through the guide plate 51, so that the gas-liquid mass transfer load at each radial position of the guide plate 51 tends to be consistent, further enhancing the uniformity of the pre-humidification and cooling treatment, creating conditions for the efficient and stable operation of the subsequent packing layer, and reducing the processing load of the subsequent packing layer.

[0037] Reference Figure 2 and Figure 6As shown, to improve the treatment effect, the nozzles 21 on the washing water pipe 2 corresponding to the packing layer or turbulent sphere layer are preferably set as wide-angle hollow cone nozzles, while the nozzles 21 on the washing water pipe 2 corresponding to the guide plate 51 are preferably set as wide-angle solid cone nozzles. In use, the water mist sprayed by the wide-angle solid cone nozzle is distributed in a solid cone shape, with relatively large and densely distributed droplet size, which can form a relatively thick water mist layer on the lower surface of the guide plate 51, and violently collide with the rising flue gas to be treated, thus enhancing the pre-humidification and cooling effect in the initial stage; while the water mist sprayed by the wide-angle hollow cone nozzle is distributed in a hollow cone shape, with relatively small and more uniformly distributed droplet size, which can form a fine water mist with a wider coverage area in the packing layer or turbulent sphere layer area, which is conducive to sufficient mass and heat transfer reaction with the stable airflow after rectification by the guide plate 51, and improves the collection efficiency of acidic gases and fine dust.

[0038] Reference Figure 3 As shown, guide blades 52 are positioned within the rectifier cylinder 5, corresponding to several exhaust holes 50, to limit their rotation. During operation, the flue gas entering the rectifier cylinder 5 impacts the guide blades 52, causing them to rotate. This rotation agitates the flue gas within the rectifier cylinder 5 and applies a centrifugal effect, prompting the flue gas to exit through the exhaust holes 50, creating a swirling diffusion pattern during the exhaust process. The rotational speed of the guide blades 52 adaptively adjusts with the flue gas flow rate. When the flue gas flow rate increases, the rotational speed of the guide blades 52 increases accordingly, enhancing the dispersion ability and centrifugal discharge effect of high-flow-rate flue gas. When the flue gas flow rate decreases, the rotational speed of the guide blades 52 decreases to avoid airflow turbulence caused by excessive agitation.

[0039] Reference Figure 6 and Figure 7 As shown, the demister 4 includes a separation block 40 located inside the tower body 1, above the packing layer or turbulent sphere layer. The separation block 40 has several uniformly distributed baffle holes 41. In use, the separation block 40 separates the rising flue gas after it has passed through the packing layer. As the flue gas passes through the baffle holes 41, the airflow direction changes abruptly multiple times. Due to inertia, entrained droplets and small particles cannot follow the airflow's direction, thus impacting and being captured on the wall of the baffle holes 41, achieving effective gas-liquid separation. The cross-sectional shape of the baffle holes 41 is designed as a wave-shaped or sawtooth structure to extend the airflow path and increase the impact and capture opportunities, while reducing airflow resistance. The separation block 40 is made of corrosion-resistant alloy material or engineering plastic, and its surface is hydrophobically treated, allowing the captured droplets to quickly converge into a film and flow down the wall, returning to the bottom circulating liquid system and avoiding secondary entrainment.

[0040] Reference Figure 6 and Figure 7As shown, a grid plate 42, which abuts against the inner wall of the tower body 1, is also limited on the lower side of the separation block 40. The grid plate 42 is spaced apart from the separation block 40, and a drive rod 43 is fixedly inserted through the middle of the grid plate 42. In use, the drive rod 43 and the grid plate 42 are driven to rotate around the drive rod 43 as the axis. The rotation of the grid plate 42 creates a disturbance to the airflow in the area below the separation block 40, destroying any stable vortex areas that may form, making the airflow distribution more uniform, and preventing excessively high local airflow velocity from causing a decrease in demisting efficiency or secondary entrainment.

[0041] As an optional implementation, the upper side of the separation block 40 is also spaced and limited by a grid plate 42 that abuts against the inner wall of the tower body 1. The drive rod 43 passes through the separation block 40 and drives the two grid plates 42 on the upper and lower sides of the separation block 40 to rotate. The lower grid plate 42 pre-distributes the airflow that is about to enter the baffle hole 41 to eliminate the airflow deviation caused by the structure of the tower body 1 or the inlet position, and pre-separates the wet flue gas. The upper grid plate 42 performs secondary rectification on the airflow after the baffle separation to ensure the flow stability of the discharged gas and performs secondary separation on the flue gas after the baffle demisting.

[0042] Furthermore, as an optional implementation, the grid holes on the grid plate 42 are preferably all set in an inclined shape, which not only ensures smooth airflow, but also uses the centrifugal force generated by the rotation of the grid plate 42 to assist in the separation of tiny droplets, so that some of the fine droplets that are not completely captured by the baffle holes 41 are thrown outward under the action of centrifugal force and hit the inner wall of the tower body 1, and finally flow back to the bottom of the tower along the wall.

[0043] Example 2: Refer to Figure 2 and Figure 6 As shown, based on Embodiment 1, the drive rod 43 extends downward and rotates through the packing layer to connect with the guide fan blade 52. Correspondingly, to avoid the problem of jamming caused by continuous contact between the drive rod 43 and the packing during rotation, a protective sleeve (not shown in the figure) is rotatably sleeved on the drive rod 43 and fixedly installed on the grid plate 3 corresponding to the packing layer, ensuring that the drive rod 43 and the packing do not contact each other throughout the process. In use, the flue gas input into the rectifier 5 drives the guide fan blade 52 to rotate and simultaneously drives the drive rod 43 to rotate, thereby driving the grid plate 42 to rotate to improve the demisting effect on the wet flue gas.

[0044] Furthermore, referring to Figures 6 to 9As shown, the drive rod 43 includes a drive rod 430, a driven rod 431, and a connecting rod 432. The drive rod 430 is connected to the lower grid plate 42 and the guide fan blade 52. The driven rod 431 is located at the upper end of the drive rod 430 and passes through the separator block 40 to connect with the upper grid plate 42. The connecting rod 432 is located between the drive rod 430 and the driven rod 431. The connecting rod 432 is fixedly connected to the driven rod 431 and splinedly fitted onto the drive rod 430. An adjusting spring 433 is connected between the bottom of the connecting rod 432 and the drive rod 430. The adjusting spring 433 is allowed to twist to a certain extent during the upward stretching process.

[0045] In operation, the flue gas enters the rectifier cylinder 5 and drives the guide fan blade 52 to rotate. The guide fan blade 52 drives the active rotating rod 430 to rotate synchronously. The active rotating rod 430 transmits torque to the connecting rod 432 and the driven rotating rod 431 through a spline connection, thereby driving the driven rotating rod 431 and the two grid plates 42 to rotate. When the flue gas accumulates due to the cooperation between the separating block 40 and its upper grid plate 42, the flue gas flow between the separating block 40 and the grid plate 42 increases. The accumulated flue gas will exert an upward pushing force on the upper grid plate 42 due to its upward dispersion characteristic, causing the upper grid plate 42 to tend to slide upward. When the upper grid plate 42 slides upward, it drives... The driven rotating rod 431 and the connecting rotating rod 432 move upward synchronously. The connecting rotating rod 432 then slides upward along the spline structure of the driving rotating rod 430. During this process, the adjusting spring 433 is stretched. After the spline between the connecting rotating rod 432 and the driving rotating rod 430 is disengaged, the connected rotating rod 432, the driven rotating rod 431, and the grid plate 42 are rapidly weakened by airflow resistance and friction. The upper grid plate 42, the driven rotating rod 431, the connecting rotating rod 432, and the upper end of the adjusting spring 433 still have an inertial tendency to be driven to rotate. The lower end of the driving rotating rod 430 and the lower end of the adjusting spring 433 continue to rotate, thereby driving the stretched adjusting spring 433 to produce torsional deformation.

[0046] The stretched and twisted adjusting spring 433 will retract and rotate, thereby driving the corresponding connecting rod 432, driven rod 431 and upper grid plate 42 to rotate in the opposite direction with the twisted adjusting spring 433 during the downward reset process, forming a shearing effect on the airflow inside the tower body 1, thereby suppressing the gas turbulence inside the tower body 1 and improving the demisting effect on the flue gas, until the connecting rod 431 and the driving rod 430 return to the spline engagement state. When the spline of the connecting rod 432 and the driving rod 430 re-engages, the driven rod 431 and the upper grid plate 42 return to the synchronous rotation state with the driving rod 430. This cycle repeats, realizing the compound action of the upper grid plate 42's periodic reciprocating motion in the vertical direction and alternating forward and reverse rotation.

[0047] Furthermore, as an optional implementation, both the spline engagement ends of the driving rod 430 and the connecting rod 431 are designed with a guide chamfer of 30°-45° (not shown in the figure). This ensures that even if there is a slight circumferential misalignment between the connecting rod 430 and the spline engagement end of the driving rod 430 during the return process, the axial restoring force will generate a circumferential component force through the chamfer, pushing the driven end to rotate slightly and guiding the spline teeth to slide smoothly into the tooth groove, thus avoiding rigid jamming.

[0048] During operation: First, the flue gas to be treated is input into the rectifier cylinder 5 through the air inlet channel 11 on the lower side wall of the tower body 1. The flue gas is then evenly discharged into the interior of the tower body 1 through the exhaust hole 50 on the upper side of the rectifier cylinder 5, which is tangentially connected to the inner cavity of the tower body 1, forming a stable rotating upward airflow and prolonging the residence time of the flue gas in the tower.

[0049] The second step involves the rotating and rising flue gas first coming into countercurrent contact with the sinking washing water mist sprayed from the nozzles 21 corresponding to the guide plate 51. The flue gas is pre-humidified and cooled, and large dust particles and some harmful components are initially captured, completing the pre-purification treatment. Subsequently, the flue gas flows upward through the guide holes 510 on the guide plate 51. After being rectified by the guide holes 510, it forms a more evenly distributed upward airflow, providing stable airflow conditions for subsequent deep purification.

[0050] Step 3: After rectification, the flue gas continues to rise and enters the packing layer area on the upper side of the guide plate 51, which is formed by the mesh plate 3 supporting the packing. The nozzles 21, which are set corresponding to the packing layer, spray washing water mist downwards. The flue gas undergoes a full countercurrent mass transfer and heat transfer reaction with the washing water from top to bottom in the packing layer. The acidic gases, fine dust and remaining harmful components in the flue gas are fully captured and absorbed by the washing water, completing the deep purification of the flue gas.

[0051] Step 4: The wet flue gas that has completed deep purification continues to flow upward and enters the demister 4 set at the top of the tower body 1. The fine droplets entrained in the flue gas are effectively captured by the demister 4, realizing gas-liquid separation, reducing the moisture content of the purified flue gas, and avoiding droplet entrainment from affecting subsequent processes.

[0052] 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 not restrictive.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flue gas scrubbing tower, comprising a tower body (1), characterized in that: The tower body (1) has an outlet (10) at the top for discharging the purified flue gas. An air inlet channel (11) is connected to the bottom of the tower body (1). A washing water pipe (2) is also fixedly connected to the outside of the tower body (1). The bottom of the tower body (1) is tapered and connected to a washing water outlet (20). After the washing water pipe (2) is connected into the tower body (1), several nozzles (21) are installed and limited. The nozzles (21) are evenly distributed along the cross-section of the tower body (1). A grid plate is set inside the tower body (1) corresponding to the lower side of the nozzles (21). (3) The grid plate (3) is used to place packing to form a packing layer or turbulent ball layer that guides the gas and liquid phases to fully contact and mix. A demister (4) is provided at the top of the tower body (1) to capture small droplets in the flue gas. The air inlet channel (11) is located on the lower side wall of the tower body (1) and extends into the tower body (1) to connect with the rectifier (5). The rectifier (5) extends upward in the axial direction of the tower body (1). Several exhaust holes (50) are evenly opened on the upper side of the rectifier (5). The exhaust holes (50) are tangentially connected to the inner cavity of the tower body (1).

2. The flue gas scrubbing tower according to claim 1, characterized in that: The tower body (1) is limited by a guide plate (51) located on the upper side of the rectifier cylinder (5). The guide plate (51) is provided with several guide holes (510) for the flue gas to pass through. The washing water pipe (2) also extends corresponding to the guide plate (51) and is equipped with several nozzles (21).

3. A flue gas scrubbing tower according to claim 2, characterized in that: The guide holes (510) on the guide plate (51) are configured as gradient holes.

4. A flue gas scrubbing tower according to claim 2, characterized in that: The distribution density of the guide holes (510) on the guide plate (51) is also gradually set.

5. A flue gas scrubbing tower according to claim 2, characterized in that: The nozzles (21) on the washing water pipe (2) corresponding to the packing layer or turbulent ball layer are hollow cone nozzles, while the nozzles (21) on the washing water pipe (2) corresponding to the guide plate (51) are solid cone nozzles.

6. A flue gas scrubbing tower according to claim 1, characterized in that: The rectifier cylinder (5) has guide fan blades (52) that are rotatably limited by several exhaust holes (50).

7. A flue gas scrubbing tower according to claim 1, characterized in that: The demister (4) includes a separation block (40) located inside the tower body (1) on the upper side of the packing layer or turbulent ball layer, and a number of baffle holes (41) are uniformly opened on the separation block (40).

8. A flue gas scrubbing tower according to claim 7, characterized in that: The lower side of the separation block (40) is also limited by a grid plate (42) that abuts against the inner wall of the tower body (1). The grid plate (42) is spaced apart from the separation block (40), and a drive rotating rod (43) is fixedly inserted through the middle of the grid plate (42).

9. A flue gas scrubbing tower according to claim 8, characterized in that: The upper side of the separation block (40) is also spaced and limited by a grid plate (42) that abuts against the inner wall of the tower body (1). The driving rod (43) passes through the separation block (40) and simultaneously drives the two grid plates (42) on the upper and lower sides of the separation block (40) to rotate.

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