A desulfurization tower

Abstract

This utility model discloses a desulfurization tower, comprising, from bottom to top, an oxidation section, a concentration section, an absorption section, and a demisting section. The concentration section has an inlet for the gas to be treated, and the absorption section has a spray device for spraying absorbent liquid. A liquid collection device is provided between the absorption section and the concentration section. The gas to be treated entering the concentration section passes through the liquid collection device into the absorption section, where the liquid collection device collects the absorbent liquid. The liquid collection device is connected to a return pipe, which is connected to the oxidation section to transport the absorbent liquid collected in the liquid collection device to the oxidation section. A gas suction device is provided at the top of the return pipe to guide oxidizing gas into the return pipe so that the absorbent liquid is oxidized within the return pipe. The purpose of this utility model is to provide a desulfurization tower that solves the technical problem of existing desulfurization towers where the absorbent liquid needs to enter the oxidation section before oxidation begins, resulting in a low oxidation rate and affecting the concentration efficiency of the concentration section.

Description

Technical Field

[0001] This utility model relates to the field of gas desulfurization technology, specifically to a desulfurization tower. Background Technology

[0002] Existing desulfurization towers consist of an oxidation section, a concentration section, and an absorption section. The gas to be treated first enters the concentration section and then flows upwards along the interior of the tower. The absorption section is equipped with a spray device that continuously sprays absorbent liquid into the tower. As the absorbent liquid falls in droplets, it forms a counter-current contact with the rising gas to be treated. During this process, the absorbent liquid fully absorbs the sulfur dioxide contained in the gas. To achieve the recycling of the absorbent liquid, a collection device is installed between the concentration section and the absorption section to collect the absorbent liquid that has come into contact with the gas to be treated. The absorbent liquid is then transported to the oxidation section through a return pipe. In the oxidation section, oxidizing gas is introduced to oxidize the absorbent liquid, ultimately producing the corresponding products. However, because the oxidation process of the absorbent liquid is strictly limited to the oxidation section, the oxidation reaction can only officially start after the absorbent liquid enters the oxidation section. This results in a lag in the initiation of the oxidation reaction. The absorbent liquid cannot undergo an effective oxidation reaction during its journey from the washing section through the collection device and the return pipe to the oxidation section, severely limiting the oxidation rate.

[0003] The slow oxidation rate also affects the concentration effect of the concentration section. The low oxidation rate of the solution will cause aerosols to be generated in the concentration section, resulting in finer crystals. This will prevent the concentration section from achieving effective concentration, thereby affecting the material balance of the entire desulfurization tower and ultimately affecting the purification effect. Utility Model Content

[0004] The purpose of this invention is to provide a desulfurization tower that solves the technical problem that the absorption liquid in existing desulfurization towers needs to enter the oxidation section before oxidation begins, resulting in a low oxidation rate and affecting the concentration efficiency of the concentration section.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A desulfurization tower includes an oxidation section, a concentration section, an absorption section, and a demisting section arranged sequentially from bottom to top. The concentration section is provided with an inlet for the gas to be treated to enter. The absorption section is provided with a spraying device for spraying absorbent liquid. A liquid collection device is provided between the absorption section and the concentration section. The gas to be treated entering the concentration section passes through the liquid collection device and enters the absorption section. The liquid collection device can collect absorbent liquid. The liquid collection device is connected to a return pipe. The return pipe is connected to the oxidation section to transport the absorbent liquid collected by the liquid collection device to the oxidation section. A gas suction device is provided at the top of the return pipe. The gas suction device is used to guide oxidizing gas into the return pipe so that the absorbent liquid is oxidized in the return pipe.

[0006] The desulfurization tower provided by this utility model also includes the following additional technical features: The reflux pipe includes an installation section, a bend section, and a drop section. One end of the installation section is connected to the liquid collection device, and the other end extends horizontally toward the side away from the absorber and out of the desulfurization tower body. The drop section extends toward the oxidation section and connects to the oxidation section. One end of the bend section is connected to the drop section, and the other end is connected to the installation section. The gas suction device is installed on the upper part of the bend section or the part of the installation section that extends out of the tower body.

[0007] The liquid-falling section includes a vertical section connected to the curved section, a variable-diameter section connected to the vertical section, and a connecting section connected to the variable-diameter section. The connecting section is connected to the oxidation section, and the inner diameter of the connecting section is smaller than the inner diameter of the vertical section.

[0008] The top of the installation section is provided with a fixing hole. The gas intake device includes a guide component set in the fixing hole. The guide component is provided with a drainage cavity. One end of the drainage cavity is connected to the installation section, and the other end is connected to air.

[0009] The end of the air guide that connects to the air is equipped with a dust cover.

[0010] The installation section is hollow and has a channel for the absorption liquid to flow. A guide plate is provided behind the fixing hole along the flow direction of the absorption liquid. The guide plate is located at the top of the channel and extends downward and inclined along the flow direction of the absorption liquid.

[0011] The guide is also equipped with a buffer chamber, which connects the drainage chamber and the channel. Along the flow direction of the absorbent liquid, the front wall of the buffer chamber extends forward and downward at an angle.

[0012] The guide is connected to an air intake assembly, which includes an air intake pipe and a gas filling component. One end of the air intake pipe is connected to the air outlet of the gas filling component, and the other end is connected to the rear wall of the buffer chamber. The rear wall is provided with multiple air intake holes.

[0013] A shielding component is provided on the side of the rear wall away from the air intake pipe. The shielding component is telescopically installed in the buffer chamber and can block the drainage chamber.

[0014] Along the flow direction of the absorbent liquid, the drainage cavity is inclined forward, and the axis of the drainage cavity is at an angle α with the horizontal direction, where α is an acute angle.

[0015] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows: 1. This application incorporates a gas intake device at the top of the reflux pipe. As the absorbent flows from the collection section through the reflux pipe to the oxidation section, air is simultaneously drawn in, ensuring sufficient contact between the absorbent and air during transport and initiating the oxidation reaction earlier. The absorbent can begin oxidation in the reflux pipe, extending the overall oxidation time, accelerating the conversion rate of sulfite to sulfate, and avoiding the oxidation "window period" while the absorbent waits to enter the oxidation section. Pre-oxidation of the absorbent within the reflux pipe reduces the accumulation of unoxidized components in the oxidation section, thereby increasing the oxidation rate of the oxidation section.

[0016] 2. In a preferred embodiment of this application, the installation section and the liquid discharge section are connected by a curved section, which changes the flow direction and velocity of the absorbent. When the absorbent enters the curved section from the horizontally extending installation section, local turbulence is generated due to the change in direction. When the gas suction device is located in the curved section, the suctioned air can be fully mixed with the absorbent by means of turbulence, increasing the contact area. When located above the installation section extending out of the tower, the air enters and flows through the curved section with the absorbent, and is further "entrained" into the liquid during the change in direction, reducing bubble dissipation, prolonging the gas-liquid contact time, promoting the reaction of sulfite ions and oxygen in the absorbent, and improving oxidation efficiency. The horizontal extension of the installation section is connected to the liquid discharge section by the curved section, avoiding liquid stagnation and deposition problems caused by right-angle or acute-angle turns. Under the action of gravity and flow inertia, the absorbent can flow more smoothly from the liquid accumulation part through the installation section and the curved section into the liquid discharge section, and finally into the oxidation section, reducing the risk of pipeline blockage.

[0017] 3. As a preferred embodiment of this application, by setting the inner diameter of the connecting section to be smaller than the inner diameter of the vertical section, the flow velocity of the absorbent liquid gradually increases when passing through the variable diameter section, making the movement path of the oxidizing gas in the absorbent liquid longer, and the collision and contact with the absorbent liquid more frequent. This avoids the oxidizing gas from escaping rapidly due to buoyancy, prolongs the reaction time between the oxidizing gas and the absorbent liquid, increases the contact area between the absorbent liquid and the oxidizing gas, and improves the oxidation efficiency.

[0018] 4. As a preferred embodiment of this application, by setting up a drainage cavity, the drainage cavity forms a dedicated channel connecting the installation section with the outside air, which makes the air intake more stable and ensures that the contact ratio between the absorbent and the air in the return pipe remains balanced, thus providing a continuous and stable oxygen supply for the oxidation reaction.

[0019] Furthermore, by installing a dust cover at the air-connecting end of the guide component, the incoming air is kept pure, preventing impurities in the air from entering the return pipe and contaminating the absorbent.

[0020] 5. In a preferred embodiment of this application, a guide plate is provided behind the fixing hole. Since the guide plate extends downward along the flow direction of the absorbent liquid, the physical barrier formed by the guide plate can effectively prevent air from escaping in the opposite direction of the absorbent liquid flow at the top of the channel. This avoids unreacted air forming a reverse airflow in the channel, thereby eliminating the flow resistance of the absorbent liquid caused by air stagnation and ensuring that the absorbent liquid can be smoothly transported along the channel. The downward tilting structure of the guide plate from the top of the channel can guide the flowing absorbent liquid, guiding it to smoothly merge into the mixing section where the air enters, avoiding the impact of local turbulence caused by airflow disturbance on the flow stability of the absorbent liquid. At the same time, when the absorbent liquid flow rate increases, the guide plate can guide the excess absorbent liquid to the middle and lower part of the channel in an orderly manner through the diversion effect of the inclined surface, preventing liquid impact or splashing caused by sudden increase in flow rate, ensuring that the absorbent liquid always enters the gas-liquid mixing area in a stable and orderly state, and ensuring the continuity and efficiency of the oxidation reaction.

[0021] 6. In a preferred embodiment of this application, a buffer chamber serves as a transition space between the drainage chamber and the channel. When the absorbent flows within the channel or mixes with air, splashing droplets are generated. The buffer chamber can directly receive these splashing droplets, preventing them from directly impacting the drainage chamber or the gas intake device. This prevents droplets from overflowing back through the drainage chamber to the air intake side, ensuring smooth air intake. Simultaneously, along the flow direction of the absorbent, the front wall of the buffer chamber extends forward and downward at an angle. When droplets splash onto the front wall, the inclined surface guides the droplets down the wall, allowing them to re-enter the main absorbent flow below. This avoids droplets accumulating in the buffer chamber and enables the recycling of splashing droplets, ensuring the buffer chamber can continuously and efficiently accommodate new splashing droplets. This maintains stable control over splashing during gas-liquid mixing and ensures the continuity of absorbent flow and oxidation reaction within the return pipe.

[0022] 7. In a preferred embodiment of this application, an oxidizing gas can be actively introduced into the buffer chamber by providing a gas filling component, and the amount of oxidizing gas can be actively adjusted to adapt to different flow rates of absorbent liquid. Simultaneously, by connecting one end of an inlet pipe to the rear wall of the buffer chamber, the gas, after entering from the rear wall, is propelled forward by the flow of the absorbent liquid in front and blocked by the front chamber wall, making it difficult for it to escape rapidly. This allows it to fully diffuse within the buffer chamber and react with the absorbent liquid. By providing multiple inlet holes, the gas can be dispersed into multiple streams, resulting in a more uniform gas distribution within the buffer chamber, a larger contact area with the absorbent liquid, and improved oxidation reaction efficiency.

[0023] Furthermore, by setting up a shielding component, the oxidation method can be freely selected according to the flow state of the absorbent. For example, when the flow rate is low and the flow volume is small, air can be drawn in through the drainage chamber for oxidation. When the flow rate increases and the flow velocity becomes faster, the gas filling component intervenes to supplement the oxidizing gas. When the flow rate further increases and the flow velocity becomes faster, the drainage chamber is closed by the shielding component, so that the oxidation process depends entirely on the gas filling component to continuously supplement the oxidizing gas, thereby achieving efficient and stable desulfurization under all operating conditions.

[0024] 8. As a preferred embodiment of this application, the inclined drainage cavity can accelerate air intake, allowing air to flow more smoothly into the absorbent liquid along the inclined angle, reducing the resistance when air enters and improving the gas-liquid mixing efficiency; at the same time, the inclined structure makes it easier for air to penetrate into the depth of the absorbent liquid, avoiding accumulation at the top of the channel and enhancing the sufficiency of the oxidation reaction. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the desulfurization tower in one embodiment of the present invention; Figure 2 This is a schematic diagram of the installation of the reflux pipe and the gas intake device in one embodiment of the present invention.

[0026] List of components and reference numerals: 1. Oxidation section; 2. Concentration section; 3. Absorption section; 4. Demisting section; 5. Liquid collection component; 6. Return pipe; 61. Installation section; 611. Fixing hole; 612. Channel; 62. Bending section; 63. Liquid drop section; 631. Vertical section; 632. Variable diameter section; 633. Connecting section; 7. Gas intake device; 71. Flow guide; 72. Drainage chamber; 73. Dust cover; 74. Buffer chamber; 741. Front wall; 742. Rear wall; 75. Shielding component; 8. Flow guide plate; 9. Air intake assembly; 91. Air intake pipe; 92. Gas filling component; 10. Circulation device. Detailed Implementation

[0027] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0028] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0029] like Figure 1 , Figure 2 As shown, a desulfurization tower includes, from bottom to top, an oxidation section 1, a concentration section 2, an absorption section 3, and a demisting section 4. The concentration section 2 is provided with an inlet (not shown in the figure) for the gas to be treated to enter. The absorption section 3 is provided with a spraying device (not shown in the figure) for spraying absorbent liquid (not shown in the figure). A liquid collection device 5 is provided between the absorption section 3 and the concentration section 2. The gas to be treated entering the concentration section 2 passes through the liquid collection device 5 and enters the absorption section 3. The liquid collection device 5 can collect absorbent liquid. The liquid collection device 5 is connected to a return pipe 6. The return pipe 6 is connected to the oxidation section 1 to transport the absorbent liquid collected by the liquid collection device 5 to the oxidation section 1. A gas suction device 7 is provided at the top of the return pipe 6. The gas suction device 7 is used to guide oxidizing gas into the return pipe 6 so that the absorbent liquid is oxidized in the return pipe 6.

[0030] This application incorporates a gas intake device 7 at the top of the return pipe 6. As the absorbent flows from the collection component 5 through the return pipe 6 to the oxidation section 1, air is simultaneously drawn in, ensuring the absorbent comes into full contact with air during transport and initiating the oxidation reaction earlier. The absorbent can begin oxidation in the return pipe 6, extending the overall oxidation time, accelerating the conversion rate of sulfite to sulfate, and avoiding the oxidation "window period" while the absorbent waits to enter the oxidation section 1. Early oxidation of the absorbent within the return pipe 6 reduces the accumulation of unoxidized components in the oxidation section 1, thereby increasing the oxidation rate of the oxidation section 1.

[0031] Those skilled in the art will understand that this application does not limit the method of storing the absorbent in the oxidation section 1. It can be done by setting the oxidation section 1 to have a receiving cavity for accommodating the absorbent, or by setting an installation cavity in the oxidation section 1, setting a storage tank in the installation cavity, and transporting the absorbent to the storage tank through the return pipe 6, etc.

[0032] In this application, the reflux pipe 6 can be configured in any of the following embodiments: Implementation method one: such as Figure 1 , Figure 2 As shown, the reflux pipe 6 includes an installation section 61, a bend section 62, and a drop section 63. One end of the installation section 61 is connected to the liquid collection component 5, and the other end extends horizontally toward the side away from the absorber and out of the desulfurization tower body. The drop section 63 extends toward the oxidation section 1 and connects to the oxidation section 1. One end of the bend section 62 is connected to the drop section 63, and the other end is connected to the installation section 61. The gas suction device 7 is installed on the upper part of the bend section 62 or the part of the installation section 61 that extends out of the tower body.

[0033] The installation section 61 and the drop section 63 are connected by a curved section 62, which changes the flow direction and speed of the absorbent. When the absorbent enters the curved section 62 from the horizontally extending installation section 61, local turbulence is generated due to the change in direction. When the gas suction device 7 is located in the curved section 62, the suctioned air can be fully mixed with the absorbent by means of turbulence, increasing the contact area. When it is located above the installation section 61 extending out of the tower, the air enters and flows through the curved section 62 with the absorbent, and is further "entrained" into the liquid during the change in direction, reducing the escape of air bubbles, prolonging the gas-liquid contact time, promoting the reaction of sulfite ions and oxygen in the absorbent, and improving the oxidation efficiency. The horizontal extension of the installation section 61 and its connection to the drop section 63 via the curved section 62 avoids the problems of liquid stagnation and deposition caused by right-angle or acute-angle turns. Under the action of gravity and flow inertia, the absorbent can flow more smoothly from the liquid collection part 5 through the installation section 61 and the curved section 62 into the drop section 63, and finally into the oxidation section 1, reducing the risk of pipeline blockage.

[0034] Implementation Method Two: This Implementation Method Two is not illustrated. The difference from Implementation Method One is that the mounting section extends downward at an angle.

[0035] As a preferred embodiment of the implementation method, the following is an example: Figure 1 , Figure 2 As shown, the liquid-falling section 63 includes a vertical section 631 connected to the curved section 62, a variable diameter section 632 connected to the vertical section 631, and a connecting section 633 connected to the variable diameter section 632. The connecting section 633 is connected to the oxidation section 1, and the inner diameter of the connecting section 633 is smaller than the inner diameter of the vertical section 631.

[0036] By setting the inner diameter of the connecting section 633 to be smaller than that of the vertical section 631, the flow velocity of the absorbent liquid gradually increases as it passes through the variable diameter section 632. This results in a longer movement path for the oxidizing gas in the absorbent liquid, more frequent collisions and contacts with the absorbent liquid, and prevents the oxidizing gas from escaping rapidly due to buoyancy. This extends the reaction time between the oxidizing gas and the absorbent liquid, increases the contact area between the absorbent liquid and the oxidizing gas, and improves the oxidation efficiency.

[0037] As a preferred embodiment of the implementation method, the following is a second preferred embodiment: Figure 1 , Figure 2 As shown, the top end of the mounting section 61 is provided with a fixing hole 611. The gas intake device 7 includes a guide member 71 disposed in the fixing hole 611. The guide member 71 is provided with a drainage cavity 72. One end of the drainage cavity 72 is connected to the mounting section 61, and the other end is connected to air. It will be clear to those skilled in the art that the oxidizing gas can be selected as needed. It can be air or other gases with oxidizing function. This application does not limit the selection.

[0038] By setting up the drainage cavity 72, a dedicated channel 612 is formed connecting the installation section 61 with the outside air, which makes the air intake more stable and ensures that the contact ratio between the absorbent liquid and the air in the return pipe 6 is kept balanced, providing a continuous and stable oxygen supply for the oxidation reaction.

[0039] As a preferred specific example under Embodiment 2: such as Figure 1 , Figure 2 As shown, a dust cover 73 is provided at the end of the guide member 71 that is connected to the air. By providing a dust cover 73 at the end of the guide member 71 that is connected to the air, the incoming air is kept pure, preventing impurities in the air from entering the return pipe 6 and contaminating the absorbent.

[0040] As a preferred specific example under embodiment 2: such as Figure 1 , Figure 2 As shown, the installation section 61 is hollow and has a channel 612 for the flow of absorbent liquid. A guide plate 8 is provided behind the fixing hole 611 along the flow direction of the absorbent liquid. The guide plate 8 is located at the top of the channel 612 and extends downwards and obliquely along the flow direction of the absorbent liquid. Those skilled in the art will understand that in this application, the return pipe 6 has a channel 612, through which the liquid collection component 5 and the oxidation section 1 are connected.

[0041] By installing a guide plate 8 behind the fixing hole 611, the guide plate 8 extends downward along the flow direction of the absorbent liquid, forming a physical barrier that effectively prevents air from escaping in the opposite direction of the absorbent liquid flow at the top of the channel 612. This avoids unreacted air forming a reverse airflow within the channel 612, thus eliminating the flow resistance of the absorbent liquid caused by air stagnation and ensuring smooth transport of the absorbent liquid along the channel 612. The downward tilting structure of the guide plate 8 from the top of the channel 612 guides the flowing absorbent liquid, guiding it smoothly into the mixing section where air enters, preventing local turbulence caused by airflow disturbance from affecting the flow stability of the absorbent liquid. Simultaneously, when the absorbent liquid flow rate increases, the guide plate 8, through the diversion effect of its inclined surface, guides excess absorbent liquid orderly to the middle and lower part of the channel 612, preventing liquid impact or splashing caused by a sudden increase in flow rate. This ensures that the absorbent liquid always enters the gas-liquid mixing area in a stable and orderly state, guaranteeing the continuity and efficiency of the oxidation reaction.

[0042] As a preferred example under specific example 2: such as Figure 1 , Figure 2 As shown, the guide member 71 is also provided with a buffer chamber 74, which connects the drainage chamber 72 and the channel 612. Along the flow direction of the absorbent liquid, the front wall of the buffer chamber 74 extends forward and downward at an angle.

[0043] The buffer chamber 74 serves as a transition space between the drainage chamber 72 and the channel 612. When the absorbent liquid flows within the channel 612 or mixes with air, splashing droplets are generated. The buffer chamber 74 can directly receive these splashing droplets, preventing them from directly impacting the drainage chamber 72 or the gas suction device 7. This prevents droplets from overflowing back through the drainage chamber 72 to the air suction side, ensuring smooth air intake. Simultaneously, along the flow direction of the absorbent liquid, the front wall of the buffer chamber 74 extends forward and downward at an angle. When droplets splash onto the front wall, the angled surface guides the droplets down the wall, allowing them to re-enter the main flow of absorbent liquid below. This avoids droplets accumulating in the buffer chamber 74 and enables the recycling of splashing droplets, ensuring that the buffer chamber 74 can continuously and efficiently accommodate new splashing droplets. This maintains stable control over splashing during gas-liquid mixing and ensures the continuity of absorbent liquid flow and oxidation reaction within the return pipe 6.

[0044] Furthermore, such as Figure 1 , Figure 2 As shown, the guide component 71 is connected to the air intake assembly 9, which includes an air intake pipe 91 and a gas filling component 92. One end of the air intake pipe 91 is connected to the outlet of the gas filling component 92, and the other end is connected to the rear wall 742 of the buffer chamber 74. The rear wall 742 is provided with multiple air inlets. By setting the gas filling component 92, oxidizing gas can be actively injected into the buffer chamber 74, and the amount of oxidizing gas injected can be actively adjusted to adapt to different flow rates of absorbent liquid. At the same time, by setting one end of the air intake pipe 91 to the rear wall 742 of the buffer chamber 74, after the gas enters from the rear wall 742, it is pushed forward by the flow of absorbent liquid in front and blocked by the front chamber wall, making it difficult to escape quickly. It can fully diffuse and react with absorbent liquid in the buffer chamber 74. By setting multiple air inlets, the gas can be dispersed into multiple airflows, making the gas distribution in the buffer chamber 74 more uniform, increasing the contact area with absorbent liquid, and improving oxidation reaction efficiency.

[0045] As a preferred option, such as Figure 1 , Figure 2 As shown, a shielding member 75 is provided on the side of the rear wall 742 away from the air intake pipe 91. The shielding member 75 is telescopically disposed in the buffer cavity 74 and can shield the drainage cavity 72.

[0046] By setting the shielding component 75, the oxidation method can be freely selected according to the flow state of the absorbent. For example, when the flow rate is low and the flow volume is small, air can be drawn in through the drainage chamber 72 for oxidation. When the flow rate increases and the flow velocity becomes faster, the gas filling component 92 intervenes to supplement the oxidizing gas. When the flow rate further increases and the flow velocity becomes faster, the drainage chamber 72 is closed by the shielding component 75, so that the oxidation process depends entirely on the gas filling component 92 to continuously supplement the oxidizing gas, thereby achieving efficient and stable desulfurization under all working conditions.

[0047] As a preferred specific example under embodiment 2: such as Figure 1 , Figure 2 As shown, the drainage cavity 72 is inclined forward along the flow direction of the absorbent liquid, and the axis of the drainage cavity 72 forms an angle α with the horizontal direction, where α is an acute angle. The inclined drainage cavity 72 can accelerate the intake of air, allowing the air to flow more smoothly into the absorbent liquid along the inclined angle, reducing the resistance when the air enters and improving the gas-liquid mixing efficiency; at the same time, the inclined structure allows the air to penetrate deeper into the absorbent liquid more easily, avoiding accumulation at the top of the channel 612 and enhancing the completeness of the oxidation reaction.

[0048] As a preferred embodiment of this application: (e.g.) Figure 1 , Figure 2 As shown, oxidation section 1 is connected to a circulation device 10. The circulation device 10 includes a delivery pipe and a delivery pump. The inlet pipe of the delivery pump is connected to oxidation section 1, and the outlet pipe of the delivery pump is connected to the delivery pipe. The delivery pipe is connected to a spraying device. By setting up the circulation device 10, the absorbent is recycled, improving the utilization rate of the absorbent and realizing the cyclic treatment of the gas to be treated.

[0049] The technical solutions protected by this utility model are not limited to the above embodiments. It should be noted that any combination of the technical solutions of any embodiment with one or more other embodiments is within the protection scope of this utility model. Although this utility model has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this utility model are within the scope of protection claimed by this utility model.

Claims

1. A desulfurization tower, comprising, from bottom to top, an oxidation section, a concentration section, an absorption section, and a demisting section, wherein the concentration section is provided with an inlet for the gas to be treated, the absorption section is provided with a spraying device for spraying absorbent liquid, and a liquid collection device is provided between the absorption section and the concentration section, wherein the gas to be treated entering the concentration section passes through the liquid collection device and enters the absorption section, and the liquid collection device is capable of collecting the absorbent liquid, characterized in that, The liquid collection device is connected to the return pipe, which is connected to the oxidation section to transport the absorbent collected by the liquid collection device to the oxidation section. A gas suction device is provided at the top of the return pipe to guide oxidizing gas into the return pipe so that the absorbent is oxidized in the return pipe.

2. A desulfurization tower according to claim 1, characterized in that, The reflux pipe includes an installation section, a bend section, and a liquid discharge section. One end of the installation section is connected to the liquid collection component, and the other end extends horizontally away from the absorption section and out of the tower body of the desulfurization tower. The liquid discharge section extends towards the oxidation section and connects to the oxidation section. One end of the bend section is connected to the liquid discharge section, and the other end is connected to the installation section. The gas suction device is located on the upper part of the bend section or the portion of the installation section that extends out of the tower body.

3. A desulfurization tower according to claim 2, characterized in that, The liquid-falling section includes a vertical section connected to the curved section, a variable-diameter section connected to the vertical section, and a connecting section connected to the variable-diameter section. The connecting section is connected to the oxidation section, and the inner diameter of the connecting section is smaller than the inner diameter of the vertical section.

4. A desulfurization tower according to claim 2, characterized in that, The top end of the mounting section is provided with a fixing hole, and the gas intake device includes a guide member disposed in the fixing hole. The guide member is provided with a drainage cavity, one end of which is connected to the mounting section and the other end is connected to air.

5. A desulfurization tower according to claim 4, characterized in that, The air guide is equipped with a dust cover at one end.

6. A desulfurization tower according to claim 4, characterized in that, The installation section is hollow and has a channel for the absorption liquid to flow. A guide plate is provided behind the fixing hole along the flow direction of the absorption liquid. The guide plate is located at the top of the channel and extends downward and obliquely along the flow direction of the absorption liquid.

7. A desulfurization tower according to claim 6, characterized in that, The flow guide is also provided with a buffer cavity, which connects the drainage cavity and the channel. Along the flow direction of the absorbent liquid, the front wall of the buffer cavity extends forward and downward at an angle.

8. A desulfurization tower according to claim 7, characterized in that, The flow guide is connected to an air intake assembly, which includes an air intake pipe and a gas filling component. One end of the air intake pipe is connected to the air outlet of the gas filling component, and the other end is connected to the rear wall of the buffer chamber. The rear wall is provided with multiple air intake holes.

9. A desulfurization tower according to claim 8, characterized in that, The rear wall is provided with a shield on the side opposite to the air intake pipe. The shield is telescopically disposed in the buffer cavity and can block the drainage cavity.

10. A desulfurization tower according to claim 4, characterized in that, Along the flow direction of the absorbent liquid, the drainage cavity is inclined forward, and the axis of the drainage cavity is at an angle α with the horizontal direction, where α is an acute angle.

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