Low energy consumption desulfurization tower liquid membrane assembly

Abstract

This invention provides a low-energy desulfurization tower liquid film assembly, relating to the field of flue gas purification. It includes an installation panel and several modules. Each module has a herringbone partition and two side liquid storage tanks. The bottom of the herringbone partition extends downwards to form a narrow, elongated channel with the liquid surface. A hydrophilic surface is provided at the corner of the bottom surface of the herringbone partition, and a water-breaking shoulder is provided at the bottom of the bottom surface. The slurry overflows from above the herringbone partition along the inclined surface. When it contacts the hydrophilic surface at the corner, the slurry rises along the bottom surface of the herringbone partition to form a bottom-attached water film. The flue gas to be purified is confined within the narrow channel between the bottom-attached water film and the liquid surface of the storage tank. This low-energy desulfurization tower liquid film assembly uses a continuous bottom-attached water film instead of discrete atomized droplets, eliminating gas-phase gaps between droplets. The flue gas is confined within the narrow channel and flows in parallel without impact, extending the gas-liquid contact time, increasing the effective contact area, reducing flue gas short-circuiting, and minimizing fluctuations in purification efficiency.

Description

Technical Field

[0001] This invention relates to the field of flue gas purification, specifically to a low-energy desulfurization tower liquid film assembly. Background Technology

[0002] Currently, most industrial wet desulfurization towers use nozzle atomization spraying. The slurry is atomized by the nozzle and sprayed out in a cone-shaped scattering pattern. Although multiple sets of nozzles are arranged in the tower, there are still certain gas phase gaps between the atomized droplets, which limits the effective gas-liquid contact area. At the same time, the flue gas velocity in the tower is high, and the residence time of the flue gas through the spray layer is short. Only a portion of the flue gas can fully contact the surface of the droplets, making it difficult to achieve deep removal of dust and SO2.

[0003] High-speed airflow impacting droplets can easily cause droplet entrainment and escape, increasing the load on the demister and making water carryover more likely. Collisions between droplets can also cause localized liquid film splashing and breakage, forming localized flue gas short circuits and causing fluctuations in purification efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a low-energy desulfurization tower liquid film assembly, which solves the problem of limited effective contact area.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a low-energy desulfurization tower liquid film assembly, including an installation plate and several modules, wherein each module is provided with a herringbone partition and two side liquid storage tanks, and the bottom of the herringbone partition extends downward to form a narrow slit channel with the liquid surface; The bottom corner of the herringbone partition is provided with a hydrophilic surface, and the bottom of the bottom surface of the herringbone partition is provided with a water-breaking shoulder; The slurry overflows from the top of the herringbone partition along the slope. When the contact corner is equipped with a hydrophilic surface, the slurry climbs up the bottom surface of the herringbone partition to form a bottom-adhering water film. The flue gas to be purified is confined in the narrow channel between the bottom-adhering water film and the liquid surface of the storage tank, and flows along the bottom surface of the herringbone partition, achieving non-impact parallel contact with the bottom-adhering water film.

[0006] Preferably, the hydrophilic surface is made of a hydrophilic material and is used to guide the slurry to rise controllably along the bottom surface of the herringbone partition to form a bottom-adhering water film.

[0007] Preferably, the water-cutting shoulder is used to forcibly cut off the surface tension of the water flow, so that the water flow drips back into the storage tank in a controlled manner.

[0008] Preferably, the mounting plate is a disc-shaped or rectangular frame structure used to support and fix several modules.

[0009] Preferably, the modules are fixed inside the mounting plate in a matrix manner, with the modules in close contact with each other.

[0010] Preferably, the module and the mounting plate are modularly detachable.

[0011] Preferably, the two sloping ends of the herringbone partition overlap the top edges of the two liquid storage tanks, and the bottom tip of the herringbone partition faces the flue gas flow channel between the two liquid storage tanks.

[0012] Preferably, the height of the liquid storage tank matches the height of the herringbone partition.

[0013] Preferably, the lower ends of the herringbone partitions are all rounded.

[0014] Preferably, each of the two liquid storage tanks has a drain outlet on the side closest to each other to discharge the deposited sludge and impurities.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The low-energy desulfurization tower liquid film component uses a continuous bottom-attached water film to replace discrete atomized droplets, eliminating gas phase gaps between droplets. The flue gas is confined in a narrow channel and flows in parallel without impact, extending the gas-liquid contact time, increasing the effective contact area, reducing flue gas short-circuiting, and resulting in small fluctuations in purification efficiency.

[0016] 2. The low-energy desulfurization tower liquid film assembly adopts a modular matrix layout. The installation plate size can be customized according to the inner diameter of the desulfurization tower. It can be installed in single or multiple layers, adaptable to the in-situ renovation of existing desulfurization towers, and is easy to construct.

[0017] 3. In this low-energy desulfurization tower liquid film component, the flue gas is strictly confined between the bottom water film of the herringbone baffle and the liquid surface of the storage tank. It can only pass through the narrow channel between the two liquid films. The gas and liquid are in full contact throughout the process, with no bypass escape space, which greatly enhances the desulfurization and dust removal effect.

[0018] 4. This low-energy desulfurization tower liquid film component relies on the slurry's self-flow and fluid adhesion effect to form a continuous water film, eliminating the need for a high-pressure atomizing pump to provide power; the water film can fully cover the flow section of the desulfurization tower, preventing flue gas from bypassing and further improving the thoroughness of purification. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the installation disk structure of the present invention; Figure 4 This is a schematic diagram of the module structure of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the module of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the herringbone partition of the present invention.

[0020] The components include: 1. Installation plate; 2. Module; 3. Herringbone partition; 4. Hydrophilic surface; 5. Water-breaking shoulder; 6. Liquid storage tank; and 7. Drain outlet. Detailed Implementation

[0021] like Figures 1-6 As shown, a low-energy desulfurization tower liquid film assembly includes an installation plate 1 and several modules 2. The modules 2 are fixed inside the installation plate 1 in a matrix manner. The modules 2 are in close contact with each other, and rubber pads are provided between the modules 2 to prevent gas from passing through the gaps due to the splicing, which would cause the gas to be discharged without treatment.

[0022] Module 2 and mounting plate 1 are modularly detachable. Mounting plate 1 has a flange structure on its edge, which facilitates sealing and fixing with the desulfurization tower wall.

[0023] The module 2 is equipped with a herringbone partition 3 and two liquid storage tanks 6 on both sides. The bottom of the herringbone partition 3 extends downward to form a narrow channel with the liquid surface. The angle between the inclined surfaces on both sides of the herringbone partition 3 is 120 degrees, which ensures that the slurry can continuously overflow on the inclined surface.

[0024] The bottom corner of the herringbone partition 3 is provided with a hydrophilic surface 4, which is made of hydrophilic material and is used to guide the slurry to rise controllably along the bottom surface of the herringbone partition 3 to form a bottom water film. It is also sandblasted to make the slurry more controllable. The bottom of the herringbone partition 3 is provided with a water-cutting shoulder 5, which is used to forcibly cut off the surface tension of the water flow, so that the water flow drips back into the storage tank 6 in a controlled manner. The lower end of the herringbone partition 3 is rounded to avoid slurry accumulation.

[0025] The slurry overflows from the top of the herringbone partition 3 along the slope. When the hydrophilic surface 4 is provided at the contact corner, the slurry climbs up the bottom surface of the herringbone partition 3 to form a bottom-adhering water film. The flue gas to be purified is confined in the narrow channel between the bottom-adhering water film and the liquid surface of the storage tank 6, and flows along the bottom surface of the herringbone partition 3, achieving non-impact parallel contact with the bottom-adhering water film.

[0026] The desulfurization tower contains a liquid film layer that completely covers the flow cross-section, thus possessing very strong absorption and adsorption capabilities. To achieve the same desulfurization effect, multiple desulfurization circulation pumps are required. This device can also achieve ultra-clean standards without operating a wet electrostatic precipitator. If an existing wet electrostatic precipitator is installed at the tail end of the desulfurization tower, it can be shut down, and the outlet dust concentration can still reach below 5 mg / Nm3. After the device is applied, it not only helps to save a significant amount of electricity and water consumption but also simplifies the system.

[0027] The slurry sprayed from the desulfurization tower itself can help remove some of the dust that the preceding dust collectors failed to remove. However, each spray layer itself generates fine droplets, which are blown out by the induced draft fan. This can lead to excessive dust levels at the outlet of some desulfurization towers or the generation of excessive gypsum rain.

[0028] When the flue gas passes through this device, the contact between the flue gas and the slurry is more thorough, allowing more of the remaining dust in the flue gas to be adsorbed by the slurry. At the same time, due to the presence of the liquid film component, fewer spray layers can be activated, resulting in fewer droplets being blown out by the induced draft fan, thus reducing the amount of dust caused by the slurry.

[0029] The designed liquid film layer, being itself a turbulent layer, acts much like airflow agitates slurry, causing limestone particles in the slurry to grind against each other. This removes calcium sulfate or calcium sulfite from the limestone surface, increasing its activity and reaction efficiency and rate. This eliminates the need for the slurry to fall into a slurry pool at the bottom of the desulfurization tower to increase activity. Therefore, our liquid film layer significantly enhances the activity of the desulfurizing agent, naturally improving desulfurization efficiency.

[0030] The mounting plate 1 is a disc-shaped or rectangular frame structure used to support and fix several modules 2.

[0031] The two sloping ends of the herringbone partition 3 overlap the top edges of the two liquid storage tanks 6 respectively, and the bottom tip of the herringbone partition 3 is directly opposite the flue gas flow channel between the two liquid storage tanks 6.

[0032] The height of the liquid storage tank 6 matches the height of the herringbone partition 3. The tank is filled with desulfurization slurry. The distance between the liquid surface and the bottom of the herringbone partition 3 is controllable, forming a stable narrow channel.

[0033] Both storage tanks 6 have drain ports 7 on their adjacent sides for discharging deposited sludge and impurities.

[0034] During use, the desulfurization slurry is transported to the top of the liquid film assembly by the desulfurization tower circulation pump and evenly distributed to the top of the herringbone partition 3 of each module 2. Under the action of gravity, it overflows steadily downward along the inclined surfaces on both sides of the herringbone partition 3. The angle design of the inclined surfaces can ensure that the slurry flow rate is slow and the distribution is uniform, avoiding local interruption or excessive overflow.

[0035] When the slurry flows through the hydrophilic surface 4 at the bottom corner of the herringbone partition 3, under the action of surface tension and Coanda effect, it changes its falling trajectory and slowly climbs up along the bottom surface of the herringbone partition 3 to form a continuous bottom water film of uniform thickness.

[0036] The bottom water film extends along the bottom surface to the water-breaking shoulder 5. The downward bending angle structure forcibly cuts off the surface tension and wall adhesion of the slurry, breaking the wall-attached flow state of the slurry. This allows excess slurry to drip back into the storage tank 6 below in a controlled manner, ensuring the thickness of the bottom water film while preventing the slurry from spreading and dripping haphazardly along the bottom surface of the herringbone partition 3.

[0037] The flue gas to be purified flows from the bottom of the desulfurization tower upwards, and is evenly distributed to each liquid film module 2 area through the hollow area of ​​the installation plate 1. Guided by the inverted V-shaped structure of the herringbone baffle 3, the flue gas is precisely distributed to the area between the liquid storage tanks 6 on both sides and the herringbone baffle 3.

[0038] Due to the confinement of the narrow slit channel, the flue gas cannot escape upwards or bypass the channel. It is strictly trapped between the bottom water film on the bottom surface of the herringbone partition 3 and the slurry surface in the storage tank 6, and can only flow parallel to the wall along the bottom surface of the herringbone partition.

[0039] During this process, the flue gas and the bottom-mounted water film achieve seamless, long-distance parallel contact. The SO2 acidic gas in the flue gas reacts chemically with the slurry and is absorbed, while particulate matter is adhered and captured by the water film. The gas and liquid phases undergo thorough mass transfer, completely completing desulfurization and dust removal. The purified flue gas flows upward through the narrow slit channel out of the liquid film assembly, continues upward through the demister for dehydration, and is then discharged from the desulfurization tower. The slurry, having absorbed pollutants, drips back into the storage tank 6, mixing with the existing slurry. Deposited dust and impurities are periodically discharged through the drain port 7 on the side wall of the storage tank 6, while the clean slurry continues to circulate and participate in liquid film formation, achieving continuous and stable purification operations.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-energy desulfurization tower liquid film assembly, comprising an installation plate (1) and several modules (2), characterized in that: The module (2) is provided with a herringbone partition (3) and two liquid storage tanks (6) on both sides. The bottom of the herringbone partition (3) extends downward to form a narrow slit channel with the liquid surface. The bottom corner of the herringbone partition (3) is provided with a hydrophilic surface (4), and the bottom of the bottom surface of the herringbone partition (3) is provided with a water-breaking shoulder (5). The slurry overflows from the top of the herringbone partition (3) along the slope. When the hydrophilic surface (4) is provided at the contact corner, the slurry climbs up along the bottom surface of the herringbone partition (3) to form a bottom-adhering water film. The flue gas to be purified is confined in the narrow channel between the bottom-adhering water film and the liquid surface of the storage tank (6), and flows along the bottom surface of the herringbone partition (3) to achieve non-impact parallel contact with the bottom-adhering water film.

2. The low-energy desulfurization tower liquid film assembly according to claim 1, characterized in that: The hydrophilic surface (4) is made of hydrophilic material and is used to guide the slurry to climb controllably along the bottom surface of the herringbone partition (3) to form a bottom-adhering water film.

3. The low-energy desulfurization tower liquid film assembly according to claim 1, characterized in that: The water-cutting shoulder (5) is used to forcibly cut off the surface tension of the water flow, so that the water flow drips back into the storage tank (6) in a controlled manner.

4. The low-energy desulfurization tower liquid film assembly according to claim 1, characterized in that: The mounting plate (1) is a disc-shaped or rectangular frame structure used to support and fix several modules (2).

5. A low-energy desulfurization tower liquid film assembly according to claim 4, characterized in that: The modules (2) are fixed inside the mounting plate (1) in a matrix manner, and the modules (2) are in close contact with each other.

6. The low-energy desulfurization tower liquid film assembly according to claim 4, characterized in that: The module (2) and the mounting plate (1) are modularly detachable.

7. The low-energy desulfurization tower liquid film assembly according to claim 1, characterized in that: The two inclined ends of the herringbone partition (3) overlap the top edges of the two liquid storage tanks (6) respectively, and the bottom tip of the herringbone partition (3) faces the flue gas flow channel between the two liquid storage tanks (6).

8. A low energy consumption desulphurization column liquid membrane module according to claim 1, characterized in that: The height of the liquid storage tank (6) matches the height of the herringbone partition (3).

9. A low energy consumption desulphurization column liquid membrane module according to claim 1, characterized in that: The lower ends of the herringbone partitions (3) are all rounded.

10. A low-energy desulfurization tower liquid film assembly according to claim 1, characterized in that: Both of the two liquid storage tanks (6) have drain ports (7) on their sides that are close to each other, for discharging the deposited sludge and impurities.

Images