A buffer tank-regulated complexed iron desulfurization system and process

Abstract

This invention relates to the field of separation, specifically to a buffer tank-controlled desulfurization system and process for complexed iron. The system includes at least one regeneration tank, at least one settling tank, and a buffer tank connected in sequence. The buffer tank and all settling tanks are connected to at least one filter press, and the buffer tank and all filter presses are connected to a filtrate tank. The buffer tank includes a cavity, which comprises a first cavity and a second cavity connected by a pipe. The first cavity is equipped with a wall-scraping component for cleaning sulfur scale on the inner wall of the cavity, and a settling-promoting component that disperses large clumps of suspended colloids to promote the settling of sulfur particles as the wall-scraping component cleans the inner wall of the cavity. This process utilizes the above system. Existing complexed iron desulfurization systems suffer from low desulfurization efficiency and poor operational stability. The system and process provided by this invention offer high desulfurization efficiency and good operational stability.

Description

Technical Field

[0001] This invention relates to the field of separation, and more specifically to a complexed iron desulfurization system and process controlled by a buffer tank. Background Technology

[0002] Complexed iron desulfurization is one of the most commonly used desulfurization processes for purifying natural gas and other gases containing sulfuric acid (containing H2S). It uses alkaline solution to absorb H2S gas and generate H2S. - Ions, through Fe 3+ The oxidizing property of Fe oxidizes it to sulfur, at which point Fe... 3+ Reduced to Fe 2+ Fe through air 2+ Oxidation and regeneration to Fe 3+ Reuse.

[0003] The sulfuric acid-containing gas first enters the natural gas desulfurization unit, and then enters the pre-reactor of the acid gas desulfurization unit. In the pre-reactor, it undergoes a preliminary reaction with the lean liquid from the lean liquid pump. After some H2S is absorbed, the sulfuric acid-containing gas continues to enter the absorption tower. The lean liquid from the lean liquid pump enters the tail gas desulfurization tower simultaneously from the top, middle and bottom positions of the absorption tower through three pipelines, and fully contacts and reacts with the sulfuric acid-containing gas. The H2S in the sulfuric acid-containing gas is absorbed, and the purified gas flows out from the top of the absorption tower. After the fluid is separated by the post-separator, it enters the venting system and is sent to the flare.

[0004] The rich liquor formed after the lean liquor in the absorption tower absorbs hydrogen sulfide must then enter the complexed iron desulfurization system to be treated into lean liquor. Existing complexed iron desulfurization systems typically include: a regeneration tank for mixing air with the rich liquor flowing out of the absorption tower to undergo an oxidative regeneration reaction to obtain a first composite solution containing sulfur particles; a settling tank for the sulfur particles in the first composite solution to settle, resulting in a second composite solution containing sulfur particles at the top and a first bottom solution containing sulfur particles at the bottom; a buffer tank for further settling of the second composite solution to obtain a first clear liquid at the top and a second bottom solution containing sulfur particles at the bottom; a filter press for pressing and filtration the sulfur in the first and second bottom solutions to obtain sulfur and a filtered clear liquid; and a filtrate tank for holding the first clear liquid and the filtered clear liquid, which constitute the lean liquor. The lean liquor in the filtrate tank is pressurized by a lean liquor pump and then diverted back into the pre-reactor and desulfurization tower to absorb H2S from the acid gas. However, during this process, sulfur particles tend to aggregate into large clumps of suspended colloids during sedimentation. These large clumps settle slowly and easily deposit and harden at the bottom and inner walls of the container, forming a hard sulfur scale. This scale not only reduces the effective volume of the container, thus decreasing its storage and processing capacity, but also increases the frequency, difficulty, and cost of container cleaning. Cleaning operations require interrupting system operation, severely impacting production continuity. Furthermore, these large clumps of suspended colloids can clog the filter cloth when entering the filter press, requiring frequent rinsing. This reduces filtration efficiency, affects the filtration effect, and may even damage the filter press, impacting system operation.

[0005] Therefore, existing complexed iron desulfurization systems suffer from low desulfurization efficiency and poor operational stability. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a complex iron desulfurization system and process with high desulfurization efficiency and good operational stability controlled by a buffer tank.

[0007] To solve the above-mentioned technical problems, the present invention provides a complexed iron desulfurization system controlled by a buffer tank, comprising at least one regeneration tank, at least one settling tank, and a buffer tank connected in sequence. The number of regeneration tanks is the same as the number of settling tanks. The buffer tank and all settling tanks are connected to at least one filter press, and the buffer tank and all filter presses are connected to a filtrate tank.

[0008] The buffer tank includes a cavity, which includes a first cavity and a second cavity connected by a pipe; the first cavity is provided with a wall scraping component for cleaning sulfur scale on the inner wall of the cavity and a settling component that can disperse large clumps of suspended colloids as the wall scraping component cleans the inner wall of the cavity to promote the settling of sulfur particles.

[0009] The settling-promoting component includes a force-bearing block that can rise and fall with the operation of the wall-scraping component, and the force-bearing block is fixedly connected to a ring; at least three wing plates are vertically mounted on the outer wall of the ring around its central axis.

[0010] As a further improvement of the present invention: the wall scraping assembly includes a rotating shaft rotatably mounted in the cavity and capable of rotating about the axis of the cavity, and a first motor for driving the rotating shaft to rotate; a downwardly inclined scraper is vertically fixedly mounted on the rotating shaft.

[0011] As a further improvement of the present invention: the settling component includes a hollow cylinder vertically fixedly installed at the bottom of the cavity. The hollow cylinder has multiple small holes on the side wall at the lower end. The hollow cylinder has a cavity, in which a piston capable of reciprocating along the axial direction of the hollow cylinder is disposed. A vertical rod is vertically installed on the top of the piston. The top end of the vertical rod passes through the upper bottom surface of the hollow cylinder and extends to the outside of the hollow cylinder. A force-bearing block is fixedly installed on the top end of the vertical rod. A ring is slidably sleeved on the outside of the hollow cylinder. The ring is fixedly connected to the force-bearing block by at least two connecting rods.

[0012] Preferably, a first return spring is fitted over the portion of the vertical rod located between the upper bottom surface of the hollow cylinder and the top of the piston. The top end of the first return spring is fixedly connected to the bottom of the upper bottom surface of the hollow cylinder, and the bottom end of the first return spring is fixedly connected to the top of the piston.

[0013] Preferably, each wing plate has multiple through holes, and each through hole is equipped with an anti-agglomeration component for breaking up large clumps of suspended colloid.

[0014] Preferably, the anti-agglomeration component includes a double-opening cylinder with openings on both sides located directly below the through hole. The double-opening cylinder is vertically fixedly installed at the bottom of the wing plate. The double-opening cylinder is made of flexible material. A truncated cone is fixedly installed at the bottom of the double-opening cylinder. Multiple drainage channels are provided on the side of the truncated cone to guide fluid from the upper part of the truncated cone to the bottom. A vibrating head is fixedly installed at the bottom of the truncated cone to break up large clumps of suspended colloids.

[0015] Preferably, the vibrating head includes a single-opening cylinder with a single-sided opening that is vertically fixedly installed at the bottom of the truncated cone. An elastic sheet is fixedly installed at the opening of the single-opening cylinder. A second return spring is vertically fixedly installed at the bottom of the upper surface of the single-opening cylinder. An impact block for impacting the elastic sheet to cause resonance is fixedly installed at the end of the second return spring away from the upper surface of the single-opening cylinder. A small column for breaking up large clumps of suspended colloid is fixedly installed at the bottom of the elastic sheet.

[0016] As a further improvement of the present invention, an ultrasonic density meter for monitoring the concentration of fluid in the settling tank is installed on the settling tank.

[0017] As a further improvement of the present invention: a drain pipe is provided in the outlet of the buffer tank, and the small end of a trumpet-shaped tube is fixedly connected to one end of the drain pipe inside the buffer tank.

[0018] This invention also provides a buffer tank-controlled complexed iron desulfurization process, which, using the above-mentioned buffer tank-controlled complexed iron desulfurization system, includes the following steps:

[0019] S1. The rich solution in the absorption tower enters the regeneration tank and mixes with air to undergo an oxidation regeneration reaction. After the sulfides in the rich solution are oxidized, the first composite solution containing sulfur particles is obtained.

[0020] S2. The first composite solution in the regeneration tank flows into the settling tank. After some sulfur particles settle, a second composite solution containing sulfur particles at the top and a first bottom solution containing sulfur particles at the bottom are obtained.

[0021] S3. The second composite solution in the settling tank flows into the buffer tank for further settling, resulting in the first clear liquid at the top and the second bottom solution containing sulfur particles at the bottom;

[0022] S4. The first clear liquid in the buffer tank flows into the filter tank;

[0023] S5. The first bottom solution in the settling tank and the second bottom solution in the buffer tank are both sent to the filter press for filter pressing and shaping, and the filtered clear liquid flows into the filtrate tank.

[0024] S6. The first clear liquid and the filtered clear liquid in the filtrate tank are pressurized by the lean liquid pump and then diverted to the pre-reactor and desulfurization tower respectively.

[0025] The beneficial effects of the present invention are as follows: The complexed iron desulfurization system and process with buffer tank regulation provided by the present invention have high desulfurization efficiency and good operational stability.

[0026] First, the scraping assembly in the buffer tank cavity can clean the sulfur particles adhering to the inner wall of the cavity in real time, reducing the probability of sulfur scale accumulation from the source, increasing the effective volume of the buffer tank, reducing the number of shutdowns for cleaning, and thus improving the efficiency of the entire system. Furthermore, the downward-sloping scraper can exert a downward force on the scraped sulfur particles during rotation, significantly increasing the settling velocity of the sulfur particles and improving settling efficiency.

[0027] Secondly, the settling-promoting component can disperse large clumps of suspended colloids as the scraping component cleans the inner wall of the chamber, thereby promoting the settling of sulfur particles. No additional power source is required. It works in conjunction with the scraping component. The fluid in the cavity of the hollow cylinder is ejected from each small hole, and the lifting and lowering of the wing plates and the vibration of the small cylinder disperse the large clumps of suspended colloids, enabling the sulfur particles to settle more quickly and avoiding the problem of filter press clogging.

[0028] In this way, by reducing the formation of large clumps of suspended colloids, the settling efficiency of sulfur particles can be improved to enhance the desulfurization efficiency of the system. At the same time, the probability of interrupting system operation to clean buffer tanks and filter cloths can be reduced when using the system, thus enhancing the stability of system operation. Attached Figure Description

[0029] Figure 1 A schematic diagram showing the positional relationship of various components in a complexed iron desulfurization system regulated by a buffer tank;

[0030] Figure 2 This is a schematic diagram of the overall structure of the buffer tank and the wall scraping assembly in this invention;

[0031] Figure 3 This is a schematic diagram of the overall structure of the first cavity (see-through view), the wall scraping assembly, and the sedimentation promotion assembly in this invention.

[0032] Figure 4 This is a schematic diagram showing the positional relationship between the first cavity, the second cavity, and the pipe in this invention;

[0033] Figure 5 This is a schematic diagram of the overall structure of the sedimentation promotion component, the anti-agglomeration component, and the vibration head in this invention;

[0034] Figure 6 This is an assembly drawing of the piston, vertical rod, force-bearing block, ring, connecting rod, and wing plate in this invention;

[0035] Figure 7 This is a schematic diagram showing the positional relationship between the wing plate, the anti-aggregation component, and the vibration head in this invention;

[0036] Figure 8 This is a schematic diagram of the overall structure of the anti-aggregation component and the vibration head in this invention;

[0037] Figure 9 This is a schematic diagram of the overall structure of the anti-aggregation component and the vibration head in this invention from another angle;

[0038] Figure 10 This is a schematic diagram of the overall structure of the frustum in this invention;

[0039] Figure 11 This is a partial cross-sectional schematic diagram of part of the frustum and the vibrating head in this invention;

[0040] The names of the components corresponding to the markings in the above figures are as follows: 1. Regeneration tank; 2. Settling tank; 3. Buffer tank; 301. First chamber; 302. Second chamber; 303. Pipeline; 4. Filter press; 5. Filtration tank; 6. Scraper assembly; 601. Rotating shaft; 602. First motor; 603. Scraper; 7. Settling promotion assembly; 701. Hollow cylinder; 7011. Orifice; 702. Piston; 703. Vertical rod; 70 4. Force-bearing block; 705. Ring; 706. Connecting rod; 707. Wing plate; 7071. Through hole; 8. Anti-aggregation component; 801. Double-opening cylinder; 802. Frustum; 8021. Drainage channel; 803. Cylinder; 9. Vibration head; 901. Single-opening cylinder; 902. Second return spring; 903. Impact block; 904. Elastic sheet; 905. Small column; 10. Liquid mixing tank; 11. Clear water tank. Detailed Implementation

[0041] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0042] like Figure 1 As shown, the present invention provides a buffer tank-controlled complexed iron desulfurization system comprising at least one regeneration tank 1 connected in sequence. Figure 1 There are two in the middle), and at least one settling tank 2 ( Figure 1 There are two in the middle), buffer tank 3, and the number of regeneration tank 1 is the same as the number of settling tank 2. Buffer tank 3 and all settling tank 2 are connected to at least one filter press 4. Figure 1 The buffer tank 3 and all the filter presses 4 are connected to the filtrate tank 5. The buffer tank-controlled complex iron desulfurization system also includes a liquid preparation tank 10 for replenishing the complex iron desulfurization system controlled by the buffer tank and a clear water tank 11 for replenishing the complex iron desulfurization system controlled by the buffer tank. An ultrasonic density meter for monitoring the concentration of the fluid in the settling tank 2 is installed on the settling tank 2 to facilitate the adjustment of the pumping rate of each pump. The outlet of the absorption tower is connected to the inlet of the regeneration tank 1. Each regeneration tank 1 is accompanied by a corresponding settling tank 2. The outlet of each regeneration tank 1 is connected to the inlet of its corresponding settling tank 2. The outlet of all settling tanks 2 located at the top, supplying the second composite solution, is connected to the inlet of the buffer tank 3. The outlet of all settling tanks 2 located at the bottom, supplying the first bottom solution, is connected to the inlet of all filter presses 4. The outlet of the buffer tank 3 located at the top, supplying the first clear liquid, is connected to the inlet of the filtrate tank 5. The outlet of the buffer tank 3 located at the bottom, supplying the second bottom solution, is connected to the inlet of all filter presses 4. The outlet of all filter presses 4 is connected to the inlet of the filtrate tank 5. The mixing tank 10 and the clear water tank 11 are connected to the equipment requiring mixing and clear water, respectively, to maintain the stability of the desulfurizing agent properties and the liquid levels of each tower and tank in the complexed iron desulfurization system regulated by the buffer tank.

[0043] like Figure 2 , Figure 3 , Figure 4 As shown, the buffer tank 3 includes a cavity, which comprises a first cavity 301 for promoting the sedimentation of sulfur particles and a second cavity 302 for containing a first clear liquid, connected by a pipe 303. The pipe 303 is inclined from top to bottom from the first cavity 301 to the second cavity 302 to facilitate the flow of the first clear liquid into the second cavity 302. The outlet of the buffer tank 3 for the second bottom solution includes an outlet on the inner wall of the first cavity 301 for the second bottom solution to flow out and an outlet on the second cavity 302 for the second bottom solution to flow out. The inner wall of the buffer tank 302 has an outlet for the second bottom solution to flow out. The inner bottom of the first cavity 301 and the inner bottom of the second cavity 302 are collectively referred to as the inner bottom of the cavity. Both the inner bottom of the first cavity 301 and the inner bottom of the second cavity 302 are inclined. The inner bottom of the first cavity 301 is inclined from top to bottom from the end away from the outlet for the second bottom solution on the inner wall of the first cavity 301 towards the end where the outlet for the second bottom solution is located. The inner bottom of the second cavity 302 is inclined from the end away from the outlet for the second bottom solution on the inner wall of the second cavity 302 towards the end where the outlet for the second bottom solution is located on the inner wall of the second cavity 302 to facilitate the flow out of the second bottom solution. The angle between the inner bottom and the horizontal plane is 15°. A drain pipe is provided in the outlet of the buffer tank 3. The end of the drain pipe located inside the buffer tank 3 is fixedly connected to the small end of the trumpet-shaped tube to facilitate the extraction of the second bottom solution. Both the first chamber 301 and the second chamber 302 are cylindrical structures, and their central axes can be perpendicular to the horizontal plane. To further accelerate particle settling, based on the Boycott effect, the first chamber 301 and the second chamber 302 can be tilted so that their central axes form an angle with the vertical plane. The Boycott effect is that tilted containers can accelerate the settling of solid particles in the solution. Although settling occurs in both the settling tank 2 and the buffer tank 3, the large number of sulfur particles settling in the settling tank 2 can easily damage the added components. Therefore, to reduce the probability of large clumps of suspended colloids entering the filter press 4 from the buffer tank 3 and to reduce sulfur scale in the buffer tank 3, a wall scraping component 6 for cleaning sulfur scale on the inner wall of the first chamber 301 and a settling-promoting component 7 that disperses large clumps of suspended colloids and promotes sulfur particle settling are provided in the first chamber 301.

[0044] like Figure 2 , Figure 3As shown, the wall scraping assembly 6 includes a rotating shaft 601 rotatably mounted in the first cavity 301 of the cavity and capable of rotating about the axis of the first cavity 301, and a first motor 602 mounted on the top of the buffer tank 3 for driving the rotating shaft 601 to rotate; the rotating shaft 601 is parallel to the axis of the first cavity 301, and a downwardly inclined scraper 603 for cleaning sulfur scale on the inner wall of the first cavity 301 is vertically fixed on the rotating shaft 601, and the scraper 603 has an arc-shaped structure for contacting the edge of the first cavity 301.

[0045] like Figure 3 , Figure 5 , Figure 6 , Figure 7As shown, the settling-promoting component 7 includes a force-bearing block 704 that can rise and fall with the operation of the wall-scraping component 6. The force-bearing block 704 is fixedly connected to a ring 705. At least three wing plates 707 are vertically mounted around the central axis on the outer wall of the ring 705, and a hollow cylinder 701 is vertically fixedly installed at the bottom of the first cavity 301 of the cavity. Multiple small holes 7011 are opened on the side wall at the lower end of the hollow cylinder 701. Each small hole 7011 is inclined upward, and there is an angle between the central axis of the small hole 7011 and the horizontal plane. The small holes 7011 are located on the curved surface of the hollow cylinder 701. The orifice on the outer wall is higher than the orifice 7011 located on the inner wall of the curved surface of the hollow cylinder 701. The hollow cylinder 701 has a cavity, in which a piston 702 is installed, capable of reciprocating along the axial direction of the hollow cylinder 701. The piston 702 is a hollow cylinder, and a vertical rod 703 is vertically mounted on the top of the piston 702. The vertical rod 703 and the connecting rod 706 are both hollow rods. The top of the vertical rod 703 penetrates the upper bottom surface of the hollow cylinder 701 and extends to the outside of the hollow cylinder 701. A force-bearing block 704 is fixedly installed on the top of the vertical rod 703. The force-bearing block 704 is a hollow sphere. A first return spring is sleeved on the portion of the vertical rod 703 located between the upper bottom surface of the hollow cylinder 701 and the top of the piston 702. The top of the first return spring is fixedly connected to the bottom of the upper bottom surface of the hollow cylinder 701, and the bottom of the first return spring is fixedly connected to the top of the piston 702. The piston 702, vertical rod 703, force-bearing block 704, ring 705, connecting rod 706, and wing plate 707 all have densities lower than the fluid density in the first cavity 301, and can float when no external force is applied. At this time, the first return spring is in a naturally extended state. The first return spring can bring the piston 702 back to its initial position when the buoyancy is insufficient or the fluid density is too high. The ring 705 is slidably sleeved on the outside of the hollow cylinder 701. The ring 705 is fixedly connected to the force-bearing block 704 by at least two connecting rods 706. At least three wing plates 707 are vertically mounted on the outer wall of the ring 705 around its central axis. The wing plates 707 are all parallel to the bottom surface of the hollow cylinder 701. The wing plate 707 includes sub-plates and mother plates stacked from top to bottom. The cross-section of the sub-plate is semi-elliptical.

[0046] like Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11As shown, multiple through holes 7071 are provided on each of the wing plates 707. Each through hole 7071 contains an anti-agglomeration component 8 for breaking up large clumps of suspended colloid. The anti-agglomeration component 8 includes a double-opening cylinder 801 with openings on both sides located directly below the through holes 7071. The central axis of the through holes 7071 and the central axis of the double-opening cylinder 801 are on the same straight line. The double-opening cylinder 801 is vertically fixedly installed at the bottom of the wing plate 707. The double-opening cylinder 801 is made of a deformable flexible material, such as latex or silicone. A frustum 802 is fixedly installed at the bottom of the double-opening cylinder 801. Multiple flow channels 8021 are provided on the sides of the frustum 802 to guide fluid flow from the top to the bottom of the frustum 802. A vibrating head 9 for breaking up large clumps of suspended colloid is fixedly installed at the bottom of the frustum 802. A cylinder 803 is vertically fixedly installed at the top of the frustum 802.

[0047] like Figure 8 , Figure 11 As shown, the vibrating head 9 includes a single-opening cylinder 901 with a single-sided opening that is vertically fixedly installed at the bottom of the frustum 802. The opening of the single-opening cylinder 901 is located at one end of the single-opening cylinder 901 away from the bottom of the frustum 802. An elastic sheet 904 is fixedly installed at the opening of the single-opening cylinder 901. A second return spring 902 is vertically fixedly installed at the bottom of the upper surface of the single-opening cylinder 901. An impact block 903 for impacting the elastic sheet 904 to cause resonance is fixedly installed at one end of the second return spring 902 away from the upper surface of the single-opening cylinder 901. The impact block 903 has a spherical structure. A small column 905 for breaking up large clumps of suspended colloid is fixedly installed at the bottom of the elastic sheet 904.

[0048] This invention also provides a buffer tank-controlled complexed iron desulfurization process, which, using the above-mentioned buffer tank-controlled complexed iron desulfurization system, includes the following steps:

[0049] S1. The rich liquid in the absorption tower enters the regeneration tank 1 and mixes with air to undergo an oxidation regeneration reaction. The sulfides in the rich liquid are oxidized into elemental sulfur (i.e., sulfur) to obtain the first composite solution containing sulfur particles. The remaining air is discharged from the vent at the top of the regeneration tank 1.

[0050] S2. The first composite solution in the regeneration tank 1 flows into the settling tank 2. After some sulfur particles settle, a second composite solution containing sulfur particles at the top and a first bottom solution containing sulfur particles at the bottom are obtained.

[0051] S3. The second composite solution in the settling tank 2 flows into the buffer tank 3 for further settling, resulting in the first clear liquid at the top and the second bottom solution containing sulfur particles at the bottom;

[0052] S4. The first clear liquid in buffer tank 3 flows into filter tank 5;

[0053] S5. The first bottom solution in the settling tank 2 and the second bottom solution in the buffer tank 3 are both sent to the filter press 4 for filter pressing and shaping. The filtered clear liquid flows into the filtrate tank 5. Both the first clear liquid and the filtered clear liquid are lean liquids.

[0054] S6. The lean liquid in the filtrate tank 5 is pressurized by the lean liquid pump and then diverted to the pre-reactor and desulfurization tower respectively to absorb H2S in the acid gas.

[0055] The working principle of this invention is as follows: the rich liquid in the absorption tower enters the regeneration tank 1 and mixes with air to undergo an oxidation regeneration reaction. After the sulfides in the rich liquid are oxidized into sulfur, a first composite solution containing sulfur particles is obtained. The remaining air is discharged from the vent at the top of the regeneration tank 1. The first composite solution in the regeneration tank 1 flows into the settling tank 2. After some sulfur particles settle, a second composite solution containing sulfur particles at the top and a first bottom solution containing sulfur particles at the bottom are obtained.

[0056] The second composite solution in settling tank 2 flows into buffer tank 3 for further settling. It first enters the first cavity 301. After settling for a period of time, the first motor 602 is started to drive the rotating shaft 601 to rotate around the axis of the first cavity 301, so that the scraper 603 scrapes the sulfur scale on the inner wall of the first cavity 301. Because the scraper 603 is tilted downward, it will push the sulfur scale downward when scraping the sulfur scale, making the sulfur scale more powerful and easier to fall. After the rotating shaft 601 stops rotating, the fluid will still maintain a short rotation due to inertia. At this time, the weak centrifugal force can make some particles move towards the inner wall of the first cavity 301, and the centrifugal force in the vertical direction will be superimposed on gravity, slightly accelerating the settling of some sulfur particles.

[0057] When the scraper 603 rotates, its lower end contacts the force-receiving blocks 704 of each sedimentation component 7 in sequence, causing the force-receiving blocks 704 to be subjected to a downward force. The fluid near the force-receiving blocks 704 will move downward, thus slightly accelerating the sedimentation of sulfur particles in the fluid. The force-receiving blocks 704 drive the piston 702 to slide downward in the cavity of the hollow cylinder 701 via the vertical rod 703. The first return spring is stretched, and the fluid that previously entered the cavity of the hollow cylinder 701 through the small holes 7011 will now flow out from the small holes 7011. The 011 jet discharge, due to the small orifice diameter of the small hole 7011 being set to an upward tilt, forms multiple upward tilting jet streams, which shear and disperse the surrounding sulfur particles, reducing the phenomenon of sulfur particles agglomerating into large clumps of suspended colloids and being crushed or caked at the bottom. This results in a uniform concentration of the second bottom solution and also allows the sulfur particles to be quickly and effectively guided to the bottom of the first cavity 301, so that the sulfur particles can be discharged in time, reducing the total amount of sulfur that remains and accumulates at the bottom and on the inner wall of the first cavity.

[0058] When the force-bearing block 704 descends, it also drives the ring 705 to slide downwards outside the hollow cylinder 701 via the connecting rods 706, thereby causing the vanes 707 to descend synchronously and break up the large clumps of suspended colloids in the first cavity 301. The arc-shaped structure on the upper surface of the sub-plate of the vane 707 can reduce the probability of sulfur particles accumulating on it. When the vane 707 descends, the fluid will exert an upward force on the frustum 802. This force is transmitted to the double-opening cylinder 801 through the frustum 802, causing the double-opening cylinder 801 to deform in the length direction. The change occurs when the length of the truncated cone 802 is compressed, causing it to approach the through hole 7071 and block it. This reduces the probability that the fluid containing more sulfur particles will rise from the through hole 7071 and hinder the settling of the sulfur particles. When the wing plate 707 stops at its lowest point, the impact block 903 will continue to fall under the action of inertia and impact the elastic sheet 904, causing vibration. The vibration of the elastic sheet 904 will drive the small column 905 to vibrate, and the vibration of the small column 905 will accelerate the separation of the large clumps of suspended colloids around the small column 905. When the lower end of the scraper 603 is no longer in contact with the force-bearing block 704, the first return spring shortens, causing the piston 702 to slide upward in the cavity of the hollow cylinder 701. The force-bearing block 704 moves upward under the action of the first return spring and buoyancy, returning to its initial position. When the force-bearing block 704 rises, each vane 707 rises, and the fluid with fewer sulfur particles flows into the through hole 7071. When it flows in, the cylinder 803 can separate the large clumps of suspended colloids. The flowing fluid pushes the frustum 802 downward, so that the double-opening cylinder 801 returns to its undeformed state. The fluid with fewer sulfur particles flows down from the drainage groove 8021 on the surface of the frustum 802 and is sprayed to the surroundings, which helps to disperse and homogenize the sulfur particles in the fluid. It also helps to mix the fluid with fewer sulfur particles with the fluid with more sulfur particles below, so that the fluid with more sulfur particles below maintains good fluidity and uniformity, which is convenient for conveying the fluid with more sulfur particles below.

[0059] After sedimentation, the second composite solution in the first chamber 301 is divided into a first clear liquid at the top and a second bottom solution containing sulfur particles at the bottom. The first clear liquid flows into the second chamber 302 through the pipe 303, and then flows into the filter tank 5. The second chamber 302 allows the trace sulfur particles remaining in the first clear liquid to settle again.

[0060] The first bottom solution in the settling tank 2 and the second bottom solution in the first chamber 301 and the second chamber 302 of the buffer tank 3 are all sent to the filter press 4 for filter pressing and shaping. The filtered clear liquid flows into the filtrate tank 5. The lean liquid in the filtrate tank 5 is pressurized by the lean liquid pump and then diverted to enter the pre-reactor and the desulfurization tower respectively to absorb H2S in the acid gas, thus completing the solution circulation process.

Claims

1. A buffer tank-regulated complexed iron desulfurization system, characterized in that, It includes at least one regeneration tank (1), at least one settling tank (2), and a buffer tank (3) connected in sequence. The number of regeneration tanks (1) is the same as the number of settling tanks (2). The buffer tank (3) and all settling tanks (2) are connected to at least one filter press (4). The buffer tank (3) and all filter presses (4) are connected to a filtrate tank (5). The buffer tank (3) includes a cavity, which includes a first cavity (301) and a second cavity (302) connected by a pipe (303); the first cavity (301) is provided with a wall scraping assembly (6) for cleaning sulfur scale on the inner wall of the cavity and a settling component (7) that can disperse large clumps of suspended colloids to promote the settling of sulfur particles as the wall scraping assembly (6) cleans the inner wall of the cavity. The settling component (7) includes a force block (704) that can move up and down with the wall scraping component (6) during operation. The force block (704) is fixedly connected to a ring (705). At least three wing plates (707) are vertically mounted on the outer wall of the ring (705) around its central axis.

2. The complexed iron desulfurization system with buffer tank regulation according to claim 1, characterized in that, The scraping assembly (6) includes a rotating shaft (601) rotatably mounted in the cavity and capable of rotating about the axis of the cavity, and a first motor (602) for driving the rotating shaft (601) to rotate. A downwardly inclined scraper (603) is vertically fixed on the rotating shaft (601).

3. A buffer tank-regulated complexed iron desulfurization system according to any one of claims 1 to 2, characterized in that, The settling component (7) includes a hollow cylinder (701) vertically fixedly installed at the bottom of the cavity. The hollow cylinder (701) has multiple small holes (7011) on its lower side wall. The hollow cylinder (701) has a cavity, in which a piston (702) is provided that can slide back and forth along the axial direction of the hollow cylinder (701). A vertical rod (703) is vertically installed on the top of the piston (702). The top end of the vertical rod (703) passes through the upper bottom surface of the hollow cylinder (701) and extends to the outside of the hollow cylinder (701). A force-bearing block (704) is fixedly installed on the top end of the vertical rod (703). A ring (705) is slidably sleeved on the outside of the hollow cylinder (701). The ring (705) is fixedly connected to the force-bearing block (704) through at least two connecting rods (706).

4. The complexed iron desulfurization system with buffer tank regulation according to claim 3, characterized in that, The vertical rod (703) located between the upper bottom surface of the hollow cylinder (701) and the top of the piston (702) is fitted with a first return spring. The top end of the first return spring is fixedly connected to the bottom of the upper bottom surface of the hollow cylinder (701), and the bottom end of the first return spring is fixedly connected to the top of the piston (702).

5. A buffer tank-regulated complexed iron desulfurization system according to any one of claims 1 to 2, characterized in that, An ultrasonic density meter for monitoring the concentration of fluid in the settling tank (2) is installed on the settling tank (2).

6. A buffer tank-regulated complexed iron desulfurization system according to any one of claims 1 to 2, characterized in that, The outlet of the buffer tank (3) is provided with a drain pipe, and the end of the drain pipe located inside the buffer tank (3) is fixedly connected to the small end of a trumpet-shaped tube.

7. A buffer tank-regulated complexed iron desulfurization process, characterized in that, The complexed iron desulfurization system with buffer tank regulation according to claim 1 includes the following steps: S1. The rich liquid in the absorption tower enters the regeneration tank (1) and mixes with air to undergo an oxidation regeneration reaction. After the sulfides in the rich liquid are oxidized, the first composite solution containing sulfur particles is obtained. S2. The first composite solution in the regeneration tank (1) flows into the settling tank (2). After some sulfur particles settle, a second composite solution containing sulfur particles at the top and a first bottom solution containing sulfur particles at the bottom are obtained. S3. The second composite solution in the settling tank (2) flows into the buffer tank (3) for further settling, resulting in the first clear liquid at the top and the second bottom solution containing sulfur particles at the bottom; S4. The first clear liquid in the buffer tank (3) flows into the filter tank (5); S5. The first bottom solution in the settling tank (2) and the second bottom solution in the buffer tank (3) are both sent to the filter press (4) for filter pressing and shaping, and the filtered clear liquid flows into the filtrate tank (5). S6. The first clear liquid and the filtered clear liquid in the filtrate tank (5) are pressurized by the lean liquid pump and then diverted to the pre-reactor and desulfurization tower respectively.

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