A bubble column tower with integral removable trays and an acid liquor stripping process
Patent Information
- Application Number
- CN202611046493.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-14
- Publication Date
- 2026-10-20
Smart Images
Figure FT_1 
Figure FT_2 
Figure FT_3
Abstract
Description
Technical Field
[0001] This invention relates to a bubble cap tower and an acid stripping process, particularly a bubble cap tower with a completely detachable tray and an acid stripping process. Background Technology
[0002] Bubble cap towers rely on the bubble cap structure on the trays to achieve full gas-liquid contact, making them a core piece of equipment commonly used in acid stripping and absorption processes. Existing traditional bubble cap tower trays employ a modular, assembled structure. For large-diameter towers, single-layer trays are often disassembled into multiple long, narrow pieces. During assembly, workers must enter the confined space within the tower through manholes, resulting in extremely limited space for installation, maintenance, and cleaning, making construction extremely difficult. In the acidic media conditions of this project, acid sludge will continuously accumulate during operation. Industry standard equipment requires complete disassembly and cleaning of the trays every six months to remove the accumulated sludge. With all the fastening bolts of traditional modular trays buried within the acid sludge for extended periods, severe corrosion and adhesion occur, making disassembly time-consuming, labor-intensive, and maintenance extremely costly.
[0003] Meanwhile, traditional bubble cap towers require a large installation gap between adjacent trays to allow for personnel access and operation, directly leading to a significant increase in the overall tower height, higher steel consumption, and higher overall cost. To meet the needs of layered assembly and personnel maintenance, multiple manholes need to be installed on the side walls of the tower, along with a large number of supporting steel, pressure plates, sealing gaskets, and other supporting components, further increasing the weight and manufacturing cost of the equipment. Traditional segmented assembly tower trays are manufactured in separate parts, making it difficult to uniformly control the flatness and dimensional accuracy of each segment. After assembly, the tray joints are prone to problems such as poor sealing and uneven liquid distribution, which can easily lead to gas-phase short circuits and reduce the efficiency of gas-liquid mass transfer reactions. Furthermore, traditional tower trays lack an independent surrounding structure, making it easy for acid sludge to get stuck in the gap between the tray and the inner wall of the tower. Long-term accumulation can cause the tray to jam and become impossible to disassemble. In addition, these stripping towers are mostly operated under negative pressure. The traditional split-panel structure has poor overall rigidity and lacks support for the tower body. A large number of reinforcing support components need to be added to the outer wall of the tower, which further increases material consumption. Multiple manhole openings also reduce the strength of the cylinder structure and increase the risk of sealing leakage.
[0004] In summary, existing traditional bubble cap towers have a series of defects, such as difficulty in disassembly and maintenance, difficulty in cleaning acid sludge, large cylinder height, high material consumption, poor processing and assembly accuracy, insufficient structural rigidity under negative pressure conditions, and high manufacturing cost. They cannot meet the requirements of this project for gradient acid solution, periodic and frequent sludge cleaning, and low-cost compact test equipment. Therefore, it is urgent to design a new type of bubble cap tower with a tray that can be hoisted and disassembled as a whole.
[0005] The purpose of this invention is to provide a bubble cap tower with a completely detachable tray and an acid stripping process. This invention features easy disassembly and maintenance, low difficulty in cleaning acid sludge, low tower height, low material consumption, high processing and assembly precision, sufficient structural rigidity under negative pressure conditions, and low manufacturing cost.
[0006] A bubble cap tower with a fully detachable tray includes an outer cylinder, inside which an upper tray, a middle tray, and a lower tray are assembled from top to bottom; a bottom cylinder is connected to the bottom of the outer cylinder, and a high-temperature steam spray pipe is connected inside the bottom cylinder; an acid spray pipe is connected to the top of the outer cylinder, and the acid spray pipe is located above the upper tray; a top cylinder is connected to the top of the outer cylinder, and a steam exhaust pipe is connected to the top cylinder. The upper, middle, and lower trays are all equipped with an integral base plate. The edge of the base plate has an upward-extending shroud. Several upward-extending gas inlet pipes are threaded through the base plate. The top of the gas inlet pipes is connected to an inverted bubble cap. Multiple air holes are provided on the side of the top of the gas inlet pipe below the bubble cap. A downward-extending drain pipe is threaded through the lower side of one side of the base plate. The drain pipes on the upper, middle, and lower trays are arranged to meet at the bottom.
[0007] Preferably, in the aforementioned bubble cap tower with a completely detachable tray, the bottom plate is provided with a high-level partition and a low-level partition, which are symmetrically arranged on the outside of the gas inlet pipe area. The height of the high-level partition is higher than that of the low-level partition, and the height of the low-level partition is higher than the height of the lower end face of the bubble cap. The drain pipe is located on the outside of the low-level partition.
[0008] Preferably, in the aforementioned bubble cap tower with a completely detachable tray, the upper surfaces of the high-level partition and the low-level partition are provided with toothed grooves perpendicular to their length direction.
[0009] Preferably, in the aforementioned bubble cap tower with a completely detachable tray, the outlet of the acid spray pipe is located outside the high-level partition on the upper tray.
[0010] Preferably, in the aforementioned bubble cap tower with a completely detachable tray, at least one set of lifting lugs is symmetrically provided on each of the upper, middle, and lower trays.
[0011] Preferably, in the aforementioned bubble cap tower with a completely detachable tray, the upper tray has a vertically installed fastening screw on the inner wall of the outer cylinder, which penetrates the inner wall of the outer cylinder and is threadedly connected to it.
[0012] Preferably, in the aforementioned bubble cap tower with a completely detachable tray, a defoaming layer is provided between the outer cylinder and the top cylinder, and a spray pipe is provided above the defoaming layer.
[0013] Preferably, in the aforementioned bubble cap tower with a completely detachable tray, the lower end of the drain pipe below the lower tray is connected to an inverted gas barrier, and a liquid distribution hole is provided on the side of the lower end of the drain pipe.
[0014] Preferably, in the aforementioned bubble cap tower with a completely detachable tray, the steam discharge pipe is horizontally arranged, the steam inlet is located on the upper side of the steam discharge pipe, and the bottom of the steam discharge pipe section located inside the top cylinder is provided with a return liquid hole.
[0015] Preferably, in the aforementioned bubble cap tower with a completely detachable tray, a baffle is provided inside the steam discharge pipe at the bottom position near the outer side of the top cylinder, and the height of the baffle is lower than the axis of the steam discharge pipe.
[0016] An acid stripping process for a bubble cap column with a completely detachable tray, implemented using the aforementioned bubble cap column, includes the following steps: S1. Equipment assembly: The upper, middle, and lower tower plates with integrated bottom plates and surrounding cylinders are hoisted into the outer cylinder as a whole in layers. The high-temperature steam spray pipe at the bottom cylinder, the acid spray pipe at the top of the tower, and the steam discharge pipe with return liquid holes and liquid baffles are assembled. S2. Continuous stripping operation: High-temperature steam is introduced from the high-temperature steam nozzle at the bottom of the tower. The steam passes through the gas inlet pipes of each tray from bottom to top, overflows through the gas holes on the side wall of the gas inlet pipe, and passes through the liquid phase of the tray. The acid is delivered to the upper tray from the acid spray pipe at the top of the tower and overflows to the lower layer through the staggered drainage pipes. The liquid is gradually concentrated and stripped by contact between the liquid and gas. The rising steam after stripping enters the steam discharge pipe. S3. Regular maintenance and sludge removal: After shutdown, the upper, middle and lower tower trays are lifted out of the tower body layer by layer by the lifting equipment, and the acid sludge accumulated in the bottom plate and the inner cylinder is directly washed away. After cleaning, the trays are lifted and reset layer by layer to continue the blow-off operation.
[0017] 1. Each tray of this invention is an integrated, integrally formed structure. It can be directly hoisted into and out of the tower body as a whole through the symmetrically arranged lifting lugs on the tray, without the need for personnel to enter the narrow space inside the tower to disassemble multiple trays. When cleaning acid sludge, the entire tray can be hoisted out of the tower for washing, which completely solves the problems of bolts being buried in acid sludge and difficult to disassemble in traditional equipment, as well as the cumbersome sludge cleaning process.
[0018] 2. The present invention features an upwardly extending shroud at the edge of the bottom plate of the tray to form an independent liquid level cylinder, which can stably maintain the liquid level, ensure that the liquid fully overflows the bubble cap gas distribution holes, ensure uniform gas-liquid contact, avoid gas phase short circuit, and stabilize the stripping reaction efficiency; the shroud isolates the tray from the inner wall of the tower, preventing acid sludge accumulation from causing the tray to jam and fail, and is more suitable for long-term acidic media conditions.
[0019] 3. This invention eliminates the need for reserved operating space inside the tower, significantly reducing the distance between adjacent tower trays. Under the same number of tower tray layers, the overall tower height is only half that of a traditional bubble cap tower. Furthermore, the integrated tower trays have built-in structural supports, which can support the inner cylinder under negative pressure conditions, reducing the need for external reinforcement support components. In addition, this invention eliminates multiple manholes, a large amount of supporting steel, split pressure plates, and spliced sealing gaskets, significantly reducing the overall consumption of steel and sealing materials, effectively lowering the manufacturing cost of the equipment.
[0020] 4. The single-layer tray of the present invention is integrally processed and formed, without gaps between multiple parts, and the processing flatness and dimensional accuracy are controllable; there is no need to consider the sealing problem between the tray parts during assembly, eliminating defects such as liquid leakage and gas flow deviation during splicing, and the gas-liquid distribution is uniform and stable, which improves the stripping and separation effect.
[0021] 5. The tray of the present invention is provided with two sets of symmetrical overflow baffles, one high and one low. The high baffle distributes the liquid and the low baffle overflows and drains the liquid. The drain pipe is arranged on the outside of the low baffle to achieve uniform lateral flow of liquid. The toothed grooves at the upper end of the baffle further refine the liquid flow to avoid liquid deviation and local liquid accumulation. The drain pipes of each layer are arranged in an alternating manner to prevent backflow of the lower layer airflow and ensure the stable formation of the acid concentration in the stepwise gradient. Attached Figure Description
[0022] Appendix Figure 1 This is a schematic diagram of the overall structure of the present invention; Appendix Figure 2 This is a schematic diagram of the structure of the upper tray of the present invention; only one gas inlet pipe and bubble cap are shown in the figure; Appendix Figure 3 This is a schematic diagram of the tower plate structure in this invention; only one air intake pipe and bubble cap are shown in the figure. Appendix Figure 4 This is a schematic diagram of the lower tray structure of the present invention; only one gas inlet pipe and bubble cap are shown in the figure. Appendix Figure 5 This is a top view of the lower and upper trays in this invention; Appendix Figure 6 This is a schematic diagram of the structure of the low-level partition of the present invention; Appendix Figure 7 This is a schematic diagram of the structure of the high-level partition of the present invention; Appendix Figure 8 This is a schematic diagram of the steam discharge pipe of the present invention.
[0023] Explanation of reference numerals in the attached drawings: 1-Outer cylinder, 2-Upper tray, 3-Middle tray, 4-Lower tray, 5-Bottom cylinder, 6-High-temperature steam nozzle, 7-Acid nozzle, 8-Steam exhaust pipe, 9-Spray pipe, 10-Demisting layer, 11-Cyclone, 12-Bottom plate, 13-Gas inlet pipe, 14-Vent hole, 15-Bubble cap, 16-Drain pipe, 17-Lifting lug, 18-High-level baffle, 19-Low-level baffle, 20-Fasting screw, 21-Divider hole, 22-Gas barrier, 23-Steam inlet, 24-Return hole, 25-Baffle, 26-Top cylinder. Detailed Implementation
[0024] The present invention will be further described below with reference to embodiments, but these embodiments are not intended to limit the scope of the invention.
[0025] Embodiments of the present invention Example 1
[0026] A bubble cap tower with a completely detachable tray, as shown in the attached figure. Figure 1-8 As shown, it includes an outer cylinder 1, inside which an upper tray 2, a middle tray 3, and a lower tray 4 are assembled from top to bottom, with multiple sets of middle trays 3; a bottom cylinder 5 is connected to the bottom of the outer cylinder 1, and a high-temperature steam spray pipe 6 is connected inside the bottom cylinder 5; an acid spray pipe 7 is connected to the top of the outer cylinder 1, and the acid spray pipe 7 is located above the upper tray 2; a top cylinder 26 is connected to the top of the outer cylinder 1, and a steam discharge pipe 8 is connected to the top cylinder 26. The upper tray 2, middle tray 3, and lower tray 4 are all provided with an integral base plate 12. The edge of the base plate 12 is provided with an upwardly extending sleeve 11. Several upwardly extending gas inlet pipes 13 are provided through the base plate 12. The top of the gas inlet pipe 13 is connected to an inverted bubble cap 15. The side of the top of the gas inlet pipe 13 below the bubble cap 15 is provided with multiple air holes 14. A downwardly extending drain pipe 16 is provided through the lower side of one side of the base plate 12. The drain pipes 16 on the upper tray 2, middle tray 3, and lower tray 4 are arranged to meet at the bottom.
[0027] In this embodiment, the outer cylinder 1 adopts a multi-segment flange splicing structure, and the material is S22053 duplex steel, which is suitable for the corrosive environment of acidic media with gradient concentration. The segmented flanges can increase or decrease the length of the cylinder section as needed, solving the problem of oversized transportation of large-diameter equipment. The bottom cylinder 5 is sealed and connected to the bottom flange of the outer cylinder 1. The high-temperature steam nozzle 6 penetrates the interior of the bottom cylinder laterally, and multiple sets of small injection holes are evenly opened on the pipe wall to distribute the steam evenly upward. The top cylinder 26 is sealed and fixed to the upper flange of the outer cylinder 1, forming a closed negative pressure operating chamber. The upper tower plate 2, middle tower plate 3, and lower tower plate 4 are integrated monolithically processed tower trays without segmented splicing seams. The surrounding cylinder 11 is bent upward along the bottom plate 12 to form an independent liquid collection tank. The outer diameter of the surrounding cylinder is slightly smaller than the inner diameter of the outer cylinder, leaving a small movement gap. The gas inlet pipe 13 is vertically welded and fixed to the base plate 12, and the array is evenly distributed. The bubble cap 15 is snapped onto the top of the gas inlet pipe, with a pre-reserved annular gas outlet gap between them. The gas holes 14 are evenly distributed around the top of the gas inlet pipe to achieve 360° uniform diffusion of steam. The drain pipes 16 of each tray are arranged on the left and right sides of the base plate, respectively, with the drain pipes of the upper tray on the left, the middle tray on the right, and the lower tray on the left, forming a staggered liquid discharge layout.
[0028] During operation, high-temperature desorption steam is introduced through the high-temperature steam nozzle 6. The steam rises through the vent pipes 13 of the lower, middle, and upper trays and exits through the vents 14, breaking through the liquid surface of the trays. The acid spray pipe 7 sprays the acid to be treated from top to bottom, and the liquid falls into the collection tank of the top tray 2. Gas and liquid fully contact and transfer mass under the bubble cap, completing the stripping of volatile components in the acid. The liquid overflows downwards layer by layer through the drain pipes 16. The staggered arrangement of the drain pipes prevents rising steam from the lower layer from directly entering the upper drain channel, preventing gas-phase short circuits. The independent confining cylinder 11 of each tray can stably maintain the liquid level, ensuring that the vents are completely submerged in the liquid, ensuring gas-liquid contact efficiency. During maintenance, the three trays can be lifted out as a whole without personnel entering the tower to disassemble the trays into smaller pieces. The trays can be directly lifted out of the tower for flushing and cleaning of acid sludge.
[0029] Further implementation, for example, is attached. Figure 1-8 As shown, the base plate 12 is provided with a high-level partition 18 and a low-level partition 19, which are symmetrically arranged on the outside of the air intake pipe 13 area. The height of the high-level partition 18 is higher than that of the low-level partition 19, and the height of the low-level partition 19 is higher than the height of the lower end face of the bubble cap 15. The drain pipe 16 is located outside the low-level partition 19. In this embodiment, the high-level partition 18 and the low-level partition 19 are welded parallel and symmetrically at both ends of the base plate 12, isolating the air intake pipe array area in the middle to form a flow channel with liquid inlet on one side and overflow on one side. The height of the high-level partition is 50-100mm higher than that of the low-level partition, and the top surface of the low-level partition is 20-30mm higher than the bottom of the bubble cap. Acid flows into the collection area of the tray from the outside of the high-level partition. The liquid first covers the entire bubble cap mass transfer area inside the high-level partition. When the liquid level exceeds the height of the low-level partition, the liquid flows over the low-level partition to the outer overflow area, and then is transported to the next layer through the drain pipe. The height of the low-level partition is higher than the bottom of the bubble cap, ensuring that all bubble cap structures are completely immersed in the liquid phase throughout the process, preventing vapor from escaping directly from the top of the bubble cap, and forcing all vapor to pass through the pores into the liquid phase, thus improving the stripping and separation effect. The high and low partitions create a stable liquid level difference, achieving uniform liquid distribution in each tray and avoiding localized flow deviation and liquid accumulation.
[0030] Further implementation, for example, is attached. Figure 1-8 As shown, the upper surfaces of the high-level partition 18 and the low-level partition 19 are provided with toothed grooves perpendicular to their length direction. In this embodiment, the toothed grooves are uniformly and continuously formed on the top surface of the partitions. The groove cross-section is an inverted trapezoid, and the groove body extends perpendicular to the length direction of the partition. The groove depth is 5-10 mm, and the tooth peaks and valleys are evenly distributed alternately. The partition is integrally milled. When the liquid flows over the partition, the toothed grooves cut the continuous liquid flow into multiple thin streams, disperse the liquid layer, and increase the specific surface area of the liquid. At the same time, it disperses the liquid flow velocity, eliminates local concentrated liquid scouring, and allows the liquid to be evenly distributed to the lower tray, further enhancing the gas-liquid two-phase contact area, improving the stripping reaction efficiency, and reducing liquid entrainment mist.
[0031] Further implementation, for example, is attached. Figure 1-8 As shown, the outlet of the acid spray nozzle 7 is located outside the high-level partition 18 on the upper tray 2. In this embodiment, the acid spray nozzle 7 is arranged horizontally below the top cylinder, with all spray holes facing downwards and aligned with the liquid inlet area outside the high-level partition of the upper tray. The spray range completely covers the liquid distribution area outside the high-level partition, and no liquid is directly sprayed into the bubble cap mass transfer zone. The acid is directly sprayed into the liquid inlet channel outside the high-level partition. The liquid first spreads evenly along the partition laterally, and then slowly crosses the high-level partition to enter the bubble cap reaction zone. This avoids the liquid directly impacting the bubble cap, causing violent fluctuations in the liquid surface and unstable gas-liquid contact, stabilizing the liquid level inside the tray, and ensuring stable and controllable mass transfer conditions for each layer.
[0032] Further implementation, for example, is attached. Figure 1-8 As shown, at least one set of lifting lugs 17 are symmetrically provided on each of the upper tower plate 2, middle tower plate 3, and lower tower plate 4. In this embodiment, the lifting lugs 17 are thickened steel plates, symmetrically welded and fixed to the left and right sides of the outer wall of the tower plate casing 11 on each layer. Each set of lugs has a lifting hole, and the lug thickness is not less than 12mm. They are fully welded to the casing for reinforcement. At least one set of symmetrical lugs is provided on each layer, and two additional sets can be provided for large-diameter tower plates. During equipment maintenance, mud cleaning, and tower plate replacement, the lifting lugs 17 are hooked onto the lifting hooks of the lifting equipment, allowing the entire integrated tower plate to be smoothly and vertically lifted into and out of the outer casing without requiring personnel to enter the confined space inside the tower to disassemble and assemble separate tower plates. When a single tower plate is damaged, it can be lifted and replaced individually, significantly reducing maintenance difficulty and operation time.
[0033] Further implementation, for example, is attached. Figure 1-8 As shown, the upper tray 2 has vertically installed fastening screws 20 on the wall of the surrounding cylinder 11. The fastening screws 20 penetrate the wall of the surrounding cylinder 11 and are threadedly connected to it. In this embodiment, multiple fastening screws 20 are evenly arranged around the circumference of the surrounding cylinder. The screws are screwed in horizontally from the outside of the outer cylinder, pass through the cylinder wall and abut against the outer wall of the surrounding cylinder. Corrosion-resistant sealing gaskets are provided at the ends of the screws to prevent acidic media from leaking and corroding the threaded structure. Under negative pressure operation, the fastening screws 20 limit and fix the top upper tray 2 from the outside, restricting the tray from floating or shifting upward. When disassembling the tray after the operation is completed, all fastening screws need to be unscrewed outward to release the limit, and the upper tray can be directly lifted and removed. Disassembly and assembly are convenient, and at the same time, the tray is prevented from shifting or tilting under negative pressure.
[0034] Further implementation, for example, is attached. Figure 1-8As shown, a demister layer 10 is provided between the outer cylinder 1 and the top cylinder 26, and a spray pipe 9 is provided above the demister layer 10. In this embodiment, the demister layer 10 is filled with a metal wire mesh demister, which is a disc structure that can be hoisted as a whole. It is clamped between the flanges of the two cylinder sections and is made of S22053 duplex steel, which is resistant to acid corrosion. The diameter of the demister layer is consistent with the inner diameter of the cylinder and there are no edge gaps. After the mist-laden steam is blown out by the three trays, it passes upward through the demister layer 10. The acidic droplets entrained in the steam collide with the wire mesh surface and converge, falling back to the lower tray by gravity. This greatly reduces the loss of acid entrainment in the tail gas, reduces the load on the tail gas treatment at the downstream end, and recovers materials.
[0035] Further implementation, for example, is attached. Figure 1-8 As shown, the lower end of the drain pipe 16 below the lower tray 4 is connected to an inverted gas baffle 22, and a liquid distribution hole 21 is provided on the side of the lower end of the drain pipe 16. In this embodiment, the gas baffle 22 is an inverted bowl-shaped structure, sealed and welded to the bottom end of the drain pipe. The bottom of the baffle is closed, and multiple liquid distribution holes 21 are opened on the side wall. The liquid distribution holes are evenly distributed around the circumference of the gas baffle, with uniform hole diameter. The bottom surface of the gas baffle is lower than the position of the liquid distribution holes to form a liquid seal groove. The upper liquid flows downward along the drain pipe 16 below the lower tray 4 and flows out laterally from the liquid distribution holes 21 into the bottom cylinder 5. The inverted gas baffle 22 is immersed in the liquid inside the bottom cylinder 5 to form a liquid seal, preventing the high-temperature steam in the bottom cylinder 5 from flowing upward from the drain pipe into the upper layer, completely avoiding gas phase short circuit, ensuring that all steam can only complete gas-liquid mass transfer through the gas inlet pipe and bubble cap, and improving the stripping efficiency.
[0036] Further implementation, for example, is attached. Figure 1-8 As shown, the steam discharge pipe 8 is horizontally arranged, with its steam inlet 23 located on the upper side of the steam discharge pipe 8. A return hole 24 is provided at the bottom of the section of the steam discharge pipe 8 located inside the top cylinder 26. In this embodiment, the steam discharge pipe 8 extends laterally through the side wall of the top cylinder. The steam inlet 23 is located at the upper semicircular position of the pipe, opening upwards to receive rising steam. Several return holes 24, with a diameter of 2-5 mm, are evenly distributed at the bottom of the pipe section immersed inside the top cylinder. The desorbed steam enters the discharge pipe through the upper steam inlet 23. The acidic droplets entrained in the steam condense and collect on the inner wall of the pipe. The liquid flows along the pipe wall to the bottom of the pipe, returns to the top cylinder through the return holes 24, and then falls back to the tray for recycling, reducing the loss of acidic media and lowering material consumption.
[0037] Further implementation, for example, is attached. Figure 1-8As shown, a baffle 25 is provided at the bottom of the steam discharge pipe 8 near the outer side of the top cylinder 26. The height of the baffle 25 is lower than the axis of the steam discharge pipe 8. In this embodiment, the baffle 25 is vertically welded to the bottom of the pipe. The height of the baffle is only 1 / 3 to 1 / 2 of the inner diameter of the pipe, which is lower than the central axis of the pipe. The baffle divides the inside of the pipe into an inner liquid collection zone and an outer exhaust zone. The condensed acid liquid accumulates inside the pipe. The baffle 25 prevents the liquid from being discharged directly to the outside, forcing the accumulated liquid to remain inside and return to the tower through the return liquid hole 24. Steam can be normally transported outward from the space above the baffle, realizing vapor-liquid separation, further reducing the amount of liquid carried in the tail gas, and improving the medium recovery rate. Example 2
[0038] An acid stripping process for a bubble cap column with a completely detachable tray, implemented using the aforementioned bubble cap column, includes the following steps: S1. Equipment assembly: The upper, middle, and lower tower plates with integrated bottom plates and surrounding cylinders are hoisted into the outer cylinder as a whole in layers. The high-temperature steam spray pipe at the bottom cylinder, the acid spray pipe at the top of the tower, and the steam discharge pipe with return liquid holes and liquid baffles are assembled. S2. Continuous stripping operation: High-temperature steam is introduced from the high-temperature steam nozzle at the bottom of the tower. The steam passes through the gas inlet pipes of each tray from bottom to top, overflows through the gas holes on the side wall of the gas inlet pipe, and passes through the liquid phase of the tray. The acid is delivered to the upper tray from the acid spray pipe at the top of the tower and overflows to the lower layer through the staggered drainage pipes. The liquid is gradually concentrated and stripped by contact between the liquid and gas. The rising steam after stripping enters the steam discharge pipe. S3. Regular maintenance and sludge removal: After shutdown, the upper, middle and lower tower trays are lifted out of the tower body layer by layer by the lifting equipment, and the acid sludge accumulated in the bottom plate and the inner cylinder is directly washed away. After cleaning, the trays are lifted and reset layer by layer to continue the blow-off operation.
[0039] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A bubble cap tower with a completely detachable tray, characterized in that: The system includes an outer cylinder (1), inside which an upper tray (2), a middle tray (3), and a lower tray (4) are assembled from top to bottom; a bottom cylinder (5) is connected to the bottom of the outer cylinder (1), and a high-temperature steam nozzle (6) is connected inside the bottom cylinder (5); an acid nozzle (7) is connected to the top of the outer cylinder (1), and the acid nozzle (7) is located above the upper tray (2); a top cylinder (26) is connected to the top of the outer cylinder (1), and a steam discharge pipe (8) is connected to the top cylinder (26). The upper tray (2), middle tray (3) and lower tray (4) are all provided with an integral base plate (12). The edge of the base plate (12) is provided with an upwardly extending sleeve (11). Several upwardly extending gas inlet pipes (13) are provided through the base plate (12). The top of the gas inlet pipe (13) is connected to an inverted bubble cap (15). The side of the top of the gas inlet pipe (13) below the bubble cap (15) is provided with multiple air holes (14). A downwardly extending drain pipe (16) is provided through the bottom of one side of the base plate (12). The drain pipes (16) on the upper tray (2), middle tray (3) and lower tray (4) are arranged to meet on the left and right sides.
2. The bubble cap tower with a completely detachable tray according to claim 1, characterized in that: The base plate (12) is provided with a high-level partition (18) and a low-level partition (19). The high-level partition (18) and the low-level partition (19) are symmetrically arranged on the outside of the air intake pipe (13) area. The height of the high-level partition (18) is higher than that of the low-level partition (19), and the height of the low-level partition (19) is higher than that of the lower end face of the blister cap (15). The drain pipe (16) is located on the outside of the low-level partition (19).
3. The bubble cap tower with a completely detachable tray according to claim 2, characterized in that: The upper surfaces of the high-position partition (18) and the low-position partition (19) are provided with toothed grooves perpendicular to their length direction.
4. The bubble cap tower with a completely detachable tray according to claim 2, characterized in that: The outlet of the acid spray nozzle (7) is located on the outside of the high-level partition (18) on the upper tray (2).
5. The bubble cap tower with an integrally detachable tray according to claim 1, characterized in that: At least one set of lifting lugs (17) is symmetrically provided on each of the upper tower plate (2), middle tower plate (3) and lower tower plate (4).
6. The bubble cap tower with a completely detachable tray according to claim 1, characterized in that: The upper tower plate (2) has a vertical fastening screw (20) on the wall of the surrounding cylinder (11), and the fastening screw (20) passes through the wall of the surrounding cylinder (11) and is threaded to it.
7. The bubble cap tower with a completely detachable tray according to claim 1, characterized in that: A defoaming layer (10) is provided between the outer cylinder (1) and the top cylinder (26), and a spray pipe (9) is provided above the defoaming layer (10).
8. The bubble cap tower with a completely detachable tray according to claim 1, characterized in that: The lower end of the drain pipe (16) below the lower tray (4) is connected to an inverted gas barrier (22), and the side of the lower end of the drain pipe (16) is provided with a liquid distribution hole (21).
9. The bubble cap tower with a completely detachable tray according to claim 1, characterized in that: The steam discharge pipe (8) is horizontally arranged, and its steam inlet (23) is located on the upper side of the steam discharge pipe (8). The bottom of the steam discharge pipe (8) located inside the top cylinder (26) is provided with a return hole (24). A baffle (25) is provided inside the steam discharge pipe (8) near the bottom of the outer side of the top cylinder (26). The height of the baffle (25) is lower than the axis of the steam discharge pipe (8).
10. An acid stripping process for a bubble cap column with detachable trays, characterized in that, The bubble cap tower described in claim 1 is implemented by comprising the following steps: S1. Equipment assembly: The upper, middle, and lower tower plates with integrated bottom plates and surrounding cylinders are hoisted into the outer cylinder as a whole in layers. The high-temperature steam spray pipe at the bottom cylinder, the acid spray pipe at the top of the tower, and the steam discharge pipe with return liquid holes and liquid baffles are assembled. S2. Continuous stripping operation: High-temperature steam is introduced from the high-temperature steam nozzle at the bottom of the tower. The steam passes through the gas inlet pipes of each tray from bottom to top, overflows through the gas holes on the side wall of the gas inlet pipe, and passes through the liquid phase of the tray. The acid is delivered to the upper tray from the acid spray pipe at the top of the tower and overflows to the lower layer through the staggered drainage pipes. The liquid is gradually concentrated and stripped by contact between the liquid and gas. The rising steam after stripping enters the steam discharge pipe. S3. Regular maintenance and sludge removal: After shutdown, the upper, middle and lower tower trays are lifted out of the tower body layer by layer by the lifting equipment, and the acid sludge accumulated in the bottom plate and the inner cylinder is directly washed away. After cleaning, the trays are lifted and reset layer by layer to continue the blow-off operation.