A desulfurization tower based on composite filler-baffle plate and a desulfurization process

Abstract

This invention discloses a desulfurization tower and desulfurization process based on a composite packing-baffle plate system. The main body of the desulfurization tower is the tower body, which contains, from bottom to top, a liquid storage tank, a gas buffer chamber, a packing zone, a baffle plate zone, a liquid distributor, and a demister. The baffle plate zone consists of several baffle plate units arranged in an alternating pattern to form a "serpentine reversible airflow channel." Each baffle plate unit includes a baffle plate body and surface components. This invention achieves uniform airflow distribution and preliminary desulfurization through the packing zone. Simultaneously, the special configuration of the baffle plates induces the Karman vortex street effect, enhancing gas-liquid turbulence. Combined with the precise adaptation of the baffle plate surface structure to the absorbent in the liquid storage tank, the Marangoni effect is triggered, achieving liquid film self-renewal. This invention solves the problems of inconvenient maintenance of baffle plates, easy liquid film failure, and limited mass transfer efficiency in traditional desulfurization towers. While reducing system pressure drop and energy consumption, it significantly improves desulfurization stability and purification effect.

Description

Technical Field

[0001] This invention belongs to the field of gas purification technology, specifically, it relates to a desulfurization tower and desulfurization process based on a composite packing-baffle plate. Background Technology

[0002] Sulfur-containing gas emissions are a significant source of air pollution. As a core piece of equipment for industrial gas purification, the desulfurization tower's mass transfer efficiency, operational stability, and ease of maintenance directly impact environmental compliance, equipment lifespan, and production cost control. With increasingly stringent environmental emission standards, developing new, high-efficiency, low-resistance, and easy-to-maintain desulfurization towers has become a technological hotspot in the fields of flue gas treatment and chemical gas purification.

[0003] Sulfur-containing waste gas in industrial production pollutes the environment and corrodes equipment, making desulfurization a crucial step in gas purification. Traditional packed towers and plate towers generally suffer from the following shortcomings: uneven absorbent distribution, easy liquid film breakage, and low gas-liquid contact efficiency; short gas-liquid contact time and poor mass transfer; weak internal flow field control capabilities, prone to flow deviation, and limited desulfurization efficiency; poor demisting and dehydration effects, resulting in a high risk of secondary pollution; and large system pressure drop and high energy consumption, failing to meet current environmental protection and energy-saving requirements.

[0004] Currently, existing desulfurization technologies and equipment have many limitations. For example, CN 216457961 U discloses a layered high-efficiency industrial desulfurization tower structure, which improves the gas-liquid contact effect through a layered desulfurization mechanism and a rotating spray assembly, achieving efficient layered treatment of waste gas and centralized collection of waste liquid. However, this patent has significant shortcomings: the desulfurization medium is only limestone and water, which is a single type and has limited ability to deeply purify high-sulfur waste gas; the spray spiral blades rely on the waste gas flow for drive, and flow fluctuations can easily lead to unstable spraying effects and poor consistency in desulfurization efficiency; the layered mesh plate structure is prone to clogging during long-term operation, affecting the long-term stable operation of the equipment.

[0005] For example, CN 216726204 U discloses an external resuscitation system for filter packing, which can realize the overall extraction, cleaning, disinfection and reuse of the packing. The cleaning effect and packing utilization rate are better than the traditional backwashing method. However, its defects are more prominent: the system requires auxiliary equipment such as an external air pump, and the operation process is complicated; the external tank and buffer tank increase the equipment footprint and investment cost; the heating and stirring process consumes additional electricity; and the rigid packing is prone to wear on the pipes and stirring components during transportation and stirring. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects in the prior art and provide a desulfurization tower and desulfurization process based on a composite packing-baffle plate. Through the design of detachable baffle plate components, the synergistic effect of turbulence enhancement and liquid film self-renewal, combined with a high-efficiency demisting function, the desulfurization efficiency, operational stability and maintenance convenience are comprehensively optimized.

[0007] The objective of this invention can be achieved through the following technical solutions: The present invention provides a desulfurization tower based on a composite packing-baffle plate. The main body of the desulfurization tower is a desulfurization tower body, and the interior of the desulfurization tower body is provided with a liquid storage tank, a gas buffer chamber, a packing area, a baffle plate area, a liquid distributor and a demister from bottom to top. The top of the desulfurization tower body is provided with an air outlet; one side wall of the desulfurization tower body is provided with an air inlet connected to a gas buffer chamber and a liquid inlet and outlet connected to a liquid storage tank; the other side wall of the desulfurization tower body is provided with a liquid pipeline, the inlet end and outlet end of the liquid pipeline are connected to the liquid storage tank and the liquid distributor respectively, and the absorbent in the liquid storage tank is pumped from bottom to top to the liquid distributor by a delivery pump installed on the liquid pipeline.

[0008] In some embodiments of the present invention, a first steel plate and a second steel plate are respectively provided at the top of the storage tank and the bottom of the packing area. Both the first steel plate and the second steel plate have uniform small holes and are connected to the inner wall of the desulfurization tower body through a flange structure.

[0009] In some embodiments of the present invention, the storage tank contains an absorbent; the absorbent is selected as a 28wt% to 32wt% aqueous solution of methyldiethanolamine or a mixed aqueous solution of methyldiethanolamine and monoethanolamine.

[0010] In some embodiments of the present invention, the ratio of the height of the packing zone to the height of the desulfurization tower body is (0.8 to 1.2):5, which is used to rectify the rising airflow and complete the initial desulfurization absorption; the packing zone is filled with porous mass transfer packing, which is selected from any one of honeycomb ceramic packing, stainless steel Pall rings and polypropylene stepped ring packing.

[0011] In some embodiments of the present invention, the baffle plate area is composed of several baffle plate units arranged alternately in the vertical direction, and adjacent baffle plate units are respectively connected to the side walls of opposite sides of the desulfurization tower body in the horizontal direction to form a "serpentine reversing airflow channel". The baffle plate units are arranged in a structure that is wider at the bottom and narrower at the top. The vertical distance between two adjacent baffle plate units is 80mm to 300mm, and the vertical distance between the installation points of two adjacent baffle plates decreases gradually in the direction of tower height by 10mm to 20mm.

[0012] Furthermore, the baffle unit is a detachable component structure, which is detachably connected to the inner wall of the desulfurization tower via flange connection or snap-on fixing device.

[0013] In some embodiments of the present invention, the baffle units are arranged in an alternating pattern to form a "serpentine deflection airflow channel". The baffle area is divided into a lower region, a middle region, and an upper region along the height direction of the tower. The lower region, the middle region, and the upper region each occupy 1 / 3 of the total height of the baffle area. The lower region has a channel width of 140mm to 160mm and a narrow section of 75mm to 85mm, the middle region has a channel width of 120mm to 140mm and a narrow section of 65mm to 75mm, and the upper region has a channel width of 100mm to 120mm and a narrow section of 55mm to 65mm. This allows the airflow to form a variable diameter channel that is wider at the bottom and narrower at the top within the tower, achieving gradual acceleration and enhanced mass transfer from bottom to top.

[0014] In some embodiments of the present invention, the baffle unit includes a baffle body and a surface assembly. The baffle body is a semi-disc-shaped plate with a flow-blocking edge. The plate surface has regularly arranged grooves and slots for mounting and fixing the surface assembly. The angle α between the baffle body and the horizontal plane is 15° to 45°. The surface assembly is any one of a flat sheet membrane assembly, a raised assembly, or a combination of a flat sheet membrane assembly and a raised assembly.

[0015] In some embodiments of the present invention, the surface assembly of the baffle unit includes any one of the following three configurations: (I) Fully Membrane-Laminated Type: A flat sheet membrane module is installed on the surface of the baffle plate body. The flat sheet membrane module is a number of rigid long strip plate structures. The thickness of a single plate structure is 1.5mm to 3mm. At least one edge of the flat sheet membrane module is provided with corrugated pleats that extend continuously along the length direction. The bottom is provided with columnar connecting parts that are fixed to the grooves of the baffle plate body by an embedded method. The material of the flat sheet membrane module is any one of stainless steel 316L, polypropylene or polyvinyl chloride. The surface of the module is hydrophilic and smooth, which is used to stabilize the liquid film, resist fouling and prevent clogging. (II) Fully Protruding Type: The surface of the baffle body is equipped with protruding components, which are several semi-columnar protrusions, forming an overall "mushroom" shape. The bottom of the protruding components is provided with columnar connecting parts that cooperate with the grooves of the baffle body for fixation. The protruding components are evenly distributed on the surface of the baffle body in an array. The height of a single protrusion is 3mm to 8mm, the diameter of a protrusion is 4mm to 10mm, and the center-to-center distance between adjacent protrusions is 15mm to 30mm. The material of the protruding components is polypropylene or polyvinyl chloride, which is used to enhance airflow disturbance, break the liquid film boundary layer, and increase the gas-liquid contact area. (III) Combined type: The surface of the baffle body is simultaneously equipped with two types of components: flat sheet membrane module and raised module. The flat sheet membrane module is fixed to a part of the baffle body in an embedded manner, and the raised module is distributed in an array in the remaining area of ​​the baffle body, arranged in a partitioned or staggered manner with the flat sheet membrane module. The flat sheet membrane module is used to stabilize the spread of liquid film, and the raised module is used to enhance airflow disturbance and liquid film renewal. The two work together to achieve efficient mass transfer and anti-clogging operation.

[0016] In some embodiments of the present invention, the liquid distributor is a trough-type liquid distributor, including a main trough, side guide channels, and an inlet connected to a liquid pipeline; the absorbent in the storage tank enters the main trough through the inlet and is diverted to the side guide channels on both sides; the side guide channels are provided with layered overflow ports on their side walls, which adopt a structure of two rows of symmetrical arrangement, and are rectangular notch type or circular opening type; the side guide channels are arranged in parallel along the cross-section of the tower, and the inside of the trough is naturally leveled by the liquid level to ensure that the liquid level height at each position is consistent.

[0017] Furthermore, the flow rate of the pump on the liquid pipeline is quantitatively matched according to the formula Q=3.6×A×δ×K, where A is the total wetting area of ​​the baffle plate, δ is the designed liquid film thickness (0.15mm~0.30mm) and K is the safety factor (1.1~1.3), so that the absorbent flows into the baffle plate area in a non-spray form through the liquid distributor and forms a spreading liquid film on its surface.

[0018] Furthermore, a gas monitoring device is installed outside the gas outlet. When the H2S concentration at the desulfurization tower outlet exceeds the standard, the absorbent is replaced from the liquid inlet and outlet positions.

[0019] Furthermore, the inlet and outlet ends of the liquid pipeline are respectively equipped with an inlet regulating valve and an outlet regulating valve for further flow regulation.

[0020] Another aspect of the present invention provides a desulfurization process based on a composite packing-baffle plate, comprising the following steps: S1. Fresh absorbent is delivered by a pump to the liquid distributor at the top of the desulfurization tower and spreads onto the surface of the baffle plate area. At the same time, sulfur-containing gas enters the desulfurization tower through the inlet and flows upward through the packing area. The porous media structure is used to achieve uniform airflow distribution and conducts preliminary mass transfer with the absorbent liquid film on the packing surface to complete pre-desulfurization and reduce the gas concentration load, thus obtaining pretreated gas. S2. The pretreated gas enters the baffle plate area and generates the Karman vortex street effect under the induction of the baffle plate area. The airflow forms alternating vortices that violently disturb the liquid film. At the same time, the microstructure on the surface of the baffle plate triggers and drives the continuous renewal of the liquid film. The gas and liquid flow in countercurrent and make deep contact, efficiently removing sulfides and obtaining primary purified gas. S3. The primary purified gas after desulfurization flows through the demister, where the entrained droplets are trapped, and the demisted gas is discharged from the outlet. At the same time, the absorbent after the reaction falls layer by layer into the storage tank, and is then sent back to the liquid distributor by the transfer pump for desulfurization reaction or periodically discharged through the liquid inlet and outlet for regeneration treatment.

[0021] Furthermore, the entire desulfurization process adopts a countercurrent contact method, and the temperature of the sulfur-containing gas is controlled at 25-45℃.

[0022] Compared with the prior art, the present invention has the following outstanding advantages: 1. This invention achieves comprehensive optimization of desulfurization efficiency, operational stability, and maintenance convenience through the design of detachable baffle components, turbulence enhancement, and synergistic effect of liquid film self-renewal, combined with efficient demisting function. Moreover, the desulfurization tower has a compact structure, a wide range of operational flexibility, and is suitable for deep desulfurization treatment of various sulfur-containing gases.

[0023] 2. The special configuration of the baffle unit of this invention induces the Karman vortex street effect, which significantly enhances gas-liquid turbulence, breaks the liquid film boundary layer, increases the gas-liquid contact area and mass transfer rate, and prolongs the gas residence time. At the same time, the microstructure on the surface of the baffle and the absorbent synergistically trigger the Marangoni effect, driving the spontaneous renewal of the liquid film, avoiding liquid film retention, aging and breakage, maintaining high-efficiency mass transfer activity. The sulfur-containing gas and the absorbent are in countercurrent contact in the flow channel of the baffle internals, which is conducive to more uniform gas-liquid distribution and further improves gas-liquid mass transfer efficiency and desulfurization effect.

[0024] 3. This invention effectively separates liquid droplets entrained in the gas by setting up a demister, avoiding secondary pollution and absorbent loss. The Karman vortex street effect, Marangoni effect and demister function work together to ensure that the outlet hydrogen sulfide concentration can be stably below 15 ppm and the desulfurization efficiency reaches more than 99.7%. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a desulfurization tower based on a composite packing-baffle plate. Figure 2 A structural and installation diagram of a fully membrane-coated baffle unit; Figure 3 This is a structural and installation diagram of a fully convex baffle unit; Figure 4 A schematic diagram and installation diagram of a combined structure for simultaneously installing flat sheet membrane modules and raised modules; Figure 5 This is a schematic diagram of a liquid distributor.

[0026] Drawing number explanation: 1-Desulfurization tower body, 2-Gas outlet, 3-Liquid distributor, 4-Demister, 5-Baffle plate area, 6-Packing area, 7-Gas buffer chamber, 8-Liquid storage tank, 9-Liquid inlet and outlet, 10-Gas inlet, 11-Liquid pipeline, 12-Transfer pump, 13-Inlet regulating valve, 14-Outlet regulating valve, 15-First steel plate, 16-Second steel plate; 31-Main tank, 32-Layered overflow port, 33-Side guide channel, 34-Liquid inlet; 50-Baffle unit, 51-Baffle body, 52-Surface assembly, 511-Groove bayonet, 521-Flat sheet membrane assembly, 522-Protrusion assembly, 523-Connecting component. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0028] Example 1 1.1 A desulfurization tower based on composite packing-baffle plate The desulfurization tower based on composite packing-baffles in this embodiment is as follows: Figure 1 As shown, the main body of the desulfurization tower is the desulfurization tower body 1. The interior of the desulfurization tower body 1 is provided with, from bottom to top, a liquid storage tank 8, a gas buffer chamber 7, a packing area 6, a baffle plate area 5, a liquid distributor 3 and a demister 4. The top of the desulfurization tower body 1 is provided with an air outlet 2; one side wall of the desulfurization tower body 1 is provided with an air inlet 10 connected to the gas buffer chamber 7 and a liquid inlet / outlet 9 connected to the liquid storage tank 8; the other side wall of the desulfurization tower body 1 is provided with a liquid pipeline 11, the inlet end and the outlet end of the liquid pipeline 11 are respectively connected to the liquid storage tank 8 and the liquid distributor 3, and the absorbent in the liquid storage tank 8 is pumped from bottom to top to the liquid distributor 3 by a delivery pump 12 provided on the liquid pipeline 11.

[0029] Furthermore, the top of the liquid storage tank 8 and the bottom of the packing area 6 are respectively provided with a first steel plate 15 and a second steel plate 16. The first steel plate 15 and the second steel plate 16 are both equipped with uniform small holes and are connected to the inner wall of the desulfurization tower body 1 through a flange structure.

[0030] Furthermore, the storage tank 8 stores an absorbent; the absorbent is selected as a 28wt% to 32wt% aqueous solution of methyl diethanolamine (MDEA) or a mixed aqueous solution of methyl diethanolamine (MDEA) and monoethanolamine (MEA).

[0031] Furthermore, the ratio of the height of the packing zone 6 to the height of the desulfurization tower body 1 is (0.8~1.2):5, which is used to rectify the rising airflow and complete the initial desulfurization absorption; the packing zone 6 is filled with porous mass transfer packing, which is selected from any one of honeycomb ceramic packing, stainless steel Pall rings and polypropylene stepped ring packing.

[0032] Furthermore, the baffle plate area 5 is composed of several baffle plate units 50 arranged alternately in the vertical direction, and adjacent baffle plate units 50 are respectively connected to the side walls of opposite sides of the desulfurization tower body 1 in the horizontal direction, forming a "serpentine reversing airflow channel". The baffle plate units 50 are arranged in a structure that is wider at the bottom and narrower at the top. The vertical distance between two adjacent baffle plate units 50 is 80mm to 300mm. The vertical distance between the installation points of two adjacent baffle plates decreases gradually in the direction of tower height by 10mm to 20mm. The baffle plate unit 50 is a detachable component structure and is detachably connected to the inner wall of the desulfurization tower body 1 through flange connection or snap-on fixing device.

[0033] Furthermore, the staggered arrangement of the baffle units 50 forms a "serpentine reversing airflow channel." The baffle region 5 is divided into a lower region, a middle region, and an upper region along the height of the tower. Each of the lower, middle, and upper regions occupies 1 / 3 of the total height of the baffle region 5. Specifically, the lower region has a channel width of 140mm-160mm and a narrow section of 75mm-85mm, the middle region has a channel width of 120mm-140mm and a narrow section of 65mm-75mm, and the upper region has a channel width of 100mm-120mm and a narrow section of 55mm-65mm. This allows the airflow to form a variable-diameter channel that is wider at the bottom and narrower at the top within the tower, achieving gradual acceleration and enhanced mass transfer from bottom to top.

[0034] Furthermore, in combination Figures 2-3 As shown, the baffle unit 50 includes a baffle body 51 and a surface assembly 52. ​​The baffle body 51 is a "semi-disc-shaped" plate with a flow-blocking edge. The plate has regularly arranged grooves and slots 511 for mounting and fixing the surface assembly 52. ​​The angle α between the baffle body 51 and the horizontal plane is 15° to 45°. The surface assembly 52 is any one of a flat sheet membrane assembly 521, a protrusion assembly 522, or a combination of a flat sheet membrane assembly 521 and a protrusion assembly 522.

[0035] Combination Figures 2-4 As shown, the surface assembly 52 of the baffle unit 50 includes any one of the following three configurations: (I) Fully membrane-laid type: such as Figure 2As shown, a flat sheet membrane assembly 521 is mounted on the surface of the baffle body 51. The flat sheet membrane assembly 521 is a plurality of rigid elongated plate-like structures, and the thickness of a single plate-like structure is 1.5mm to 3mm. The flat sheet membrane assembly 521 has corrugated pleats extending continuously along its length on at least one edge, and a columnar connecting component 523 is provided at the bottom to be fixed in place by fitting with the groove slot 511 of the baffle body 51. The material of the flat sheet membrane assembly 521 is selected from any one of stainless steel 316L, polypropylene, or polyvinyl chloride. The surface of the component is hydrophilic and smooth, which is used to stabilize the spread of liquid film, resist fouling, and prevent clogging. (II) Fully convex type: such as Figure 3 As shown, the surface of the baffle body 51 is equipped with protrusion components 522. The protrusion components 522 are several semi-columnar protrusion structures, forming an overall "mushroom shape". The bottom of the protrusion components 522 is provided with columnar connecting parts 523, which cooperate with the groove slots 511 of the baffle body 51 for fixation. The protrusion components 522 are evenly distributed on the surface of the baffle body 51 in an array. The height of a single protrusion is 3mm to 8mm, the diameter of a protrusion is 4mm to 10mm, and the center-to-center distance between adjacent protrusions is 15mm to 30mm. The material of the protrusion components 522 is polypropylene or polyvinyl chloride, which is used to enhance airflow disturbance, break the liquid film boundary layer, and increase the gas-liquid contact area. (III) Combination type: such as Figure 4 As shown, the surface of the baffle body 51 is simultaneously equipped with two types of components: a flat membrane assembly 521 and a protruding assembly 522. The flat membrane assembly 521 is fixed to a portion of the baffle body in an embedded manner, while the protruding assembly 522 is distributed in an array in the remaining area of ​​the baffle body, arranged in a partitioned or staggered manner with the flat membrane assembly 521. The flat membrane assembly 521 is used to stabilize the spread of the liquid film, while the protruding assembly 522 is used to enhance airflow disturbance and liquid film renewal. The two work together to achieve efficient mass transfer and anti-clogging operation.

[0036] Combination Figure 5 As shown, the liquid distributor 3 is a trough-type liquid distributor, including a main trough 31, side guide channels 33, and an inlet 34 connected to the liquid pipeline 11. The absorbent in the storage tank 8 enters the main trough 31 through the inlet 34 and is then diverted to the side guide channels 33 on both sides. The side guide channels 33 have layered overflow ports 32 on their side walls. These layered overflow ports 32 adopt a symmetrical arrangement in two rows, and are either rectangular notches or circular openings. The side guide channels 33 are arranged in parallel along the cross-section of the tower, and the interior of the trough is naturally leveled by the liquid level to ensure that the liquid level is consistent at all positions.

[0037] Furthermore, the flow rate of the delivery pump 12 on the matching liquid pipeline 11 is quantified according to the formula Q=3.6×A×δ×K, where A is the total wetting area of ​​the baffle plate, δ is the designed liquid film thickness (0.15mm~0.30mm) and K is the safety factor (1.1~1.3), so that the absorbent flows into the baffle plate area 5 in a non-spray form through the liquid distributor 3 and forms a spreading liquid film on its surface.

[0038] Furthermore, a gas monitoring device (not shown in the figure) is installed outside the gas outlet 2. When the H2S concentration at the desulfurization tower outlet exceeds the standard, the absorbent is replaced from the liquid inlet / outlet 9.

[0039] Furthermore, the inlet end and outlet end of the liquid pipeline 11 are respectively provided with an inlet regulating valve 13 and an outlet regulating valve 14 for further regulating the flow rate.

[0040] Furthermore, the side wall of the desulfurization tower body 1 is provided with a sealed, openable area (not shown in the figure) for replacing the components inside the tower body.

[0041] 1.2 A desulfurization process based on composite packing-baffle plates Combination Figure 1 Using the desulfurization tower described in 1.1 above, the desulfurization process includes the following steps: S1. Fresh absorbent is delivered by pump 12 to liquid distributor 3 at the top of desulfurization tower body 1, and spreads to the surface of baffle plate area 5 through liquid distributor 3; at the same time, sulfur-containing gas enters desulfurization tower body 1 through inlet 10, flows upward through packing area 6, and achieves uniform airflow distribution by utilizing porous media structure, and performs preliminary mass transfer with absorbent liquid film on the surface of packing, completing pre-desulfurization and reducing gas concentration load to obtain pretreated gas. S2. The pretreated gas enters the baffle zone 5 and generates the Karman vortex street effect under the induction of the baffle unit 50. The airflow forms alternating vortices that violently disturb the liquid film. At the same time, the microstructure on the surface of the baffle triggers and drives the continuous renewal of the liquid film. The gas and liquid flow in countercurrent and make deep contact, efficiently removing sulfides and obtaining primary purified gas. S3. The primary purified gas after desulfurization flows through the demister 4, where the entrained droplets are intercepted, and the demisted gas is discharged from the outlet 2. At the same time, the absorbent after reaction falls layer by layer into the storage tank 8, and is sent back to the liquid distributor 3 by the transfer pump 12 for desulfurization reaction or periodically discharged through the liquid inlet and outlet 9 for regeneration treatment.

[0042] Furthermore, the entire desulfurization process adopts a countercurrent contact method, and the temperature of the sulfur-containing gas is controlled at 25-45℃.

[0043] mechanism: Sulfur-containing gas first enters the lower part of the desulfurization tower through the inlet, passing through the packing zone to complete pre-desulfurization and gas flow uniformity. After being processed in the packing zone, the gas enters the baffle zone. The baffle body, acting as a blunt body, forms an angle with the gas flow. When the sulfur-containing gas flows across the surface of the baffle, the Karman vortex street effect is generated, forming periodic vortices on both sides of the baffle, significantly enhancing gas-liquid turbulent mixing, breaking the liquid film boundary layer, and increasing the gas-liquid contact area and mass transfer rate. At the same time, the microstructure on the surface of the baffle and the absorbent synergistically trigger the Marangoni effect, and the surface tension gradient drives the spontaneous renewal of the liquid film, avoiding liquid film retention, aging, and breakage, and maintaining high-efficiency mass transfer activity. The desulfurized gas flows through the demister, where entrained droplets are trapped, and the clean gas after demisting is discharged from the outlet. The reacted absorbent falls layer by layer into the storage tank, and is then pumped back to the liquid distributor for recycling or discharged through the liquid outlet for regeneration.

[0044] Example 2 This embodiment uses the desulfurization tower and its desulfurization process based on composite packing-baffle plate as described in Embodiment 1. The inner diameter of the desulfurization tower body 1 is 800mm, and the total effective height is 6m. The packing zone 6 is filled with DN25 stainless steel Pall rings with a height of 1.2m. The baffle plate zone 5 is equipped with 6 sets of baffle plate units 50, each with only flat plate membrane modules 521 installed. The thickness of a single plate structure is 2.5mm. The flat plate membrane modules 521 are made of 316L stainless steel. The angle α between the bottom baffle plate body 51 and the horizontal plane is 30°. The channel width in the lower region is 150mm and the narrow section is 80mm. The channel width in the middle region is 130mm and the narrow section is 70mm. The channel width in the upper region is 110mm and the narrow section is 60mm. The absorbent is a 30wt% MDEA aqueous solution. The temperature of the sulfur-containing gas is controlled at 35℃ during the desulfurization process.

[0045] Example 3 This embodiment adopts the desulfurization tower and desulfurization process based on composite packing-baffle plate from Embodiment 1. The inner diameter of the desulfurization tower body 1 is 800mm, and the total effective height is 6m. The packing zone 6 is filled with honeycomb ceramic packing with a height of 1.0m. The baffle plate zone 5 is equipped with 5 sets of baffle plate units 50, each with only protruding components 522 installed. The protruding components 522 are evenly distributed in an array on the surface of the baffle plate body 51. The height of a single protrusion is 5mm, the diameter of a protrusion is 8mm, and the center-to-center distance between adjacent protrusions is 25mm. The protruding components 522 are made of polypropylene. The angle α between the bottom baffle plate body 51 and the horizontal plane is 30°. The channel width in the lower region is 150mm and the narrow section is 80mm. The channel width in the middle region is 130mm and the narrow section is 70mm. The channel width in the upper region is 110mm and the narrow section is 60mm. The absorbent is a 30wt% MDEA aqueous solution, and the temperature of the sulfur-containing gas is controlled at 35℃.

[0046] Example 4 This embodiment uses the desulfurization tower and desulfurization process based on composite packing-baffle plates from Embodiment 1. The inner diameter of the desulfurization tower body 1 is 800mm, and the total effective height is 6m. The packing material in the packing zone 6 is DN25 stainless steel Pall rings with a height of 1.2m. The baffle plate zone 5 is equipped with 6 sets of baffle plate units, each set simultaneously installing a flat sheet membrane module 521 and a raised module 522. The flat sheet membrane module 521 is made of 316L stainless steel, and the thickness of a single plate structure is 2.5mm. The raised module... Part 522 is made of PVC, with a single protrusion height of 5mm, a protrusion diameter of 8mm, and a center-to-center distance of 25mm between adjacent protrusions; the angle α between the bottom baffle body 51 and the horizontal plane is 30°; the lower region has a channel width of 150mm and a narrow section of 80mm, the middle region has a channel width of 130mm and a narrow section of 70mm, and the upper region has a channel width of 110mm and a narrow section of 60mm; the absorbent is a 30wt% MDEA aqueous solution, and the temperature of the sulfur-containing gas is controlled at 35℃.

[0047] Performance testing Application tests and analyses were conducted using the desulfurization towers described in Examples 2-4 and traditional packed desulfurization towers. The conventional packed desulfurization tower has the same inner diameter and total effective height as the desulfurization towers in Examples 2-4, and is filled with DN25 stainless steel Pall ring packing with a packing layer stacking height of 3.0m.

[0048] Test 1, Example 2, and Traditional Packed Desulfurization Tower 1. Process parameters: The flow rate of the sulfur-containing gas to be treated is 3000 Nm³ / h, the inlet H2S concentration is 5000 ppm, the operating temperature is 35℃, and the circulation rate of the liquid pipeline is 8 m³ / h.

[0049] 2. Performance Comparison Results (1) Desulfurization efficiency analysis: The H2S concentration at the outlet of the desulfurization tower of the present invention is consistently below 15ppm, and the desulfurization efficiency reaches 99.7%; the H2S concentration at the outlet of the traditional packed tower is about 180ppm, and the desulfurization efficiency is about 96.4%. The desulfurization efficiency of the present invention is increased by 3.3 percentage points.

[0050] (2) Pressure drop analysis inside the tower: The total pressure drop of the desulfurization tower system of the present invention is ≤1.8kPa, while the total pressure drop of the traditional packed tower system is about 3.5kPa, which reduces the pressure drop by about 48.6%, and significantly reduces the energy consumption of the fan operation.

[0051] Test 2, Example 3 and Traditional Packed Desulfurization Tower 1. Process parameters: The flow rate of the sulfur-containing gas to be treated is 3200 Nm³ / h, the inlet H2S concentration is 5500 ppm, the dust content is 40 mg / m³, the operating temperature is 35℃, and the liquid pipeline circulation rate is 8.5 m³ / h.

[0052] 2. Performance Comparison Results (1) Desulfurization efficiency analysis: The H2S concentration at the outlet of the desulfurization tower of the present invention is consistently below 12ppm, and the desulfurization efficiency reaches 99.8%; the H2S concentration at the outlet of the traditional packed tower is about 230ppm, and the desulfurization efficiency is about 95.8%, which increases the desulfurization efficiency of the present invention by 3.5 percentage points.

[0053] (2) Pressure drop analysis inside the tower: The total pressure drop of the desulfurization tower system of the present invention is ≤1.9kPa, while the total pressure drop of the traditional packed tower system is about 4.0kPa, which reduces the pressure drop by about 52.5%, and the energy consumption advantage is significant.

[0054] Test 3, Example 4, and Traditional Packed Desulfurization Tower 1. Process parameters: Sulfur-containing gas to be treated: flow rate 3500 Nm³ / h (high load condition), inlet H2S concentration 6000 ppm, containing 50 mg / m³ dust (high suspended solids condition), operating temperature 35℃, liquid pipeline circulation rate 9 m³ / h.

[0055] 2. Performance Comparison Results (1) Desulfurization efficiency analysis: The H2S concentration at the outlet of the desulfurization tower of the present invention is consistently below 12ppm, and the desulfurization efficiency reaches 99.8%; the H2S concentration at the outlet of the traditional packed tower is about 250ppm, and the desulfurization efficiency is about 95.8%, which increases the desulfurization efficiency of the present invention by 4.0 percentage points.

[0056] (2) Pressure drop analysis inside the tower: The total pressure drop of the desulfurization tower system of the present invention is ≤2.0kPa, while the total pressure drop of the traditional packed tower system is about 4.2kPa, which reduces the pressure drop by about 52.4%, and the energy consumption advantage is significant.

[0057] In summary, the data above demonstrates that the desulfurization tower of this invention performs excellently under all three operating conditions: the desulfurization efficiency reaches over 99.7%, an improvement of 3.3 to 4.0 percentage points compared to traditional packed towers; the system pressure drop is reduced by 48.6% to 52.5%, resulting in significant energy savings; and the advantages of this invention are further amplified under dusty and high-load conditions, with the outlet H2S concentration consistently below 12 to 15 ppm. Its pollution resistance and adaptability to operating conditions are significantly superior to traditional packed towers, making it a valuable industrial application.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present application in any way. Although the present application discloses the preferred embodiment as described above, it is not intended to limit the present application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of the present application using the disclosed technical content are equivalent to equivalent implementation cases. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention are still within the scope of the technical solution.

Claims

1. A desulfurization tower based on a composite packing-baffle plate, characterized in that, The main body of the desulfurization tower is the desulfurization tower body, and the interior of the desulfurization tower body is provided from bottom to top as follows: liquid storage tank, gas buffer chamber, packing area, baffle plate area, liquid distributor and demister. The top of the desulfurization tower body is provided with an air outlet; one side wall of the desulfurization tower body is provided with an air inlet connected to a gas buffer chamber and a liquid inlet and outlet connected to a liquid storage tank; the other side wall of the desulfurization tower body is provided with a liquid pipeline, the inlet end and outlet end of the liquid pipeline are connected to the liquid storage tank and the liquid distributor respectively, and the absorbent in the liquid storage tank is pumped from bottom to top to the liquid distributor by a delivery pump installed on the liquid pipeline.

2. The desulfurization tower based on composite packing-baffle plate according to claim 1, characterized in that, The top of the liquid storage tank and the bottom of the filling area are respectively provided with a first steel plate and a second steel plate, both of which have uniform small holes.

3. The desulfurization tower based on composite packing-baffle plate according to claim 1, characterized in that, The absorbent is selected as a 28wt% to 32wt% aqueous solution of methyl diethanolamine or a mixed aqueous solution of methyl diethanolamine and monoethanolamine.

4. The desulfurization tower based on composite packing-baffle plate according to claim 1, characterized in that, The ratio of the height of the packing zone to the height of the desulfurization tower body is (0.8~1.2):5; the packing zone is filled with porous mass transfer packing, which is selected from any one of honeycomb ceramic packing, stainless steel Pall rings and polypropylene stepped ring packing.

5. The desulfurization tower based on composite packing-baffle plate according to claim 1, characterized in that, The baffle plate area is composed of several baffle plate units arranged alternately in the vertical direction, and adjacent baffle plate units are connected to the side walls of opposite sides of the desulfurization tower body in the horizontal direction to form a "serpentine backflow channel". The baffle plate units are arranged in a structure that is wider at the bottom and narrower at the top, and the vertical distance between two adjacent baffle plate units is 80mm to 300mm.

6. The desulfurization tower based on composite packing-baffle plate according to claim 5, characterized in that, The staggered arrangement of the baffle units forms a "serpentine deflection airflow channel." The baffle area is divided into a lower region, a middle region, and an upper region along the height of the tower. Each of the lower, middle, and upper regions occupies 1 / 3 of the total height of the baffle area. Specifically, the lower region has a channel width of 140mm to 160mm and a narrow section of 75mm to 85mm; the middle region has a channel width of 120mm to 140mm and a narrow section of 65mm to 75mm; and the upper region has a channel width of 100mm to 120mm and a narrow section of 55mm to 65mm.

7. The desulfurization tower based on composite packing-baffle plate according to claim 5, characterized in that, The baffle unit includes a baffle body and a surface assembly. The baffle body is a semi-circular plate with a flow-blocking edge, and the plate surface has regularly arranged grooves and slots. The angle α between the baffle body and the horizontal plane is 15° to 45°. The surface assembly is any one of a flat sheet membrane assembly, a raised assembly, a combination of a flat sheet membrane assembly and a raised assembly.

8. The desulfurization tower based on composite packing-baffle plate according to claim 7, characterized in that, The surface components of the baffle unit include any one of the following three configurations: (I) Fully membrane-laid type: The surface of the baffle plate body is equipped with a flat sheet membrane module. The flat sheet membrane module is a number of rigid long strip plate structures. The thickness of a single plate structure is 1.5mm to 3mm. At least one edge of the flat sheet membrane module is provided with corrugated pleats that extend continuously along the length direction. The bottom is provided with columnar connecting parts that are fixed to the groove of the baffle plate body by an embedded method. (II) Fully protruding type: The surface of the baffle body is equipped with protruding components, which are several semi-columnar protrusions, forming an overall "mushroom shape". The bottom of the protruding components is provided with columnar connecting parts that cooperate with the grooves of the baffle body for fixation. The protruding components are evenly distributed on the surface of the baffle body in an array. The height of a single protrusion is 3mm to 8mm, the diameter of the protrusion is 4mm to 10mm, and the center-to-center distance between adjacent protrusions is 15mm to 30mm. (III) Combined type: The surface of the baffle body is simultaneously equipped with two types of components: flat sheet membrane components and protrusion components. The flat sheet membrane components are fixed to a part of the baffle body in an embedded manner, and the protrusion components are distributed in an array in the remaining area of ​​the baffle body, arranged in a partitioned or staggered manner with the flat sheet membrane components.

9. The desulfurization tower based on composite packing-baffle plate according to claim 1, characterized in that, The liquid distributor is a trough-type liquid distributor, including a main trough, a side guide trough, and an inlet connected to the liquid pipeline; the side guide trough is arranged in parallel along the cross-section of the tower, and its side wall is provided with layered overflow ports.

10. A desulfurization process based on a composite packing-baffle plate, employing the desulfurization tower according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Fresh absorbent is delivered by a pump to the liquid distributor at the top of the desulfurization tower and spreads onto the surface of the baffle plate area. At the same time, sulfur-containing gas enters the desulfurization tower through the inlet and flows upward through the packing area. The porous media structure is used to achieve uniform airflow distribution and conducts preliminary mass transfer with the absorbent liquid film on the packing surface to complete pre-desulfurization and reduce the gas concentration load, thus obtaining pretreated gas. S2. The pretreated gas enters the baffle plate area and generates the Karman vortex street effect; at the same time, the microstructure on the surface of the baffle plate triggers and drives the continuous renewal of the liquid film, and the gas and liquid countercurrent deep contact, efficiently removing sulfides and obtaining primary purified gas. S3. The primary purified gas after desulfurization flows through the demister, where the entrained droplets are trapped, and the demisted gas is discharged from the outlet. At the same time, the absorbent after the reaction falls layer by layer into the storage tank, and is then sent back to the liquid distributor by the transfer pump for desulfurization reaction or periodically discharged through the liquid inlet and outlet for regeneration treatment.

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