Multi-stage circulating absorption device for sulfur dioxide
By using an independent modular design for a multi-stage circulating absorption device, the problems of slurry deposition and inter-stage interference were solved, achieving efficient sulfur dioxide removal and manganese resource recovery, and ensuring the stable operation and flexible adaptability of the device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIANGTAN ELECTROCHEMICAL SCI CO LTD
- Filing Date
- 2026-02-02
- Publication Date
- 2026-04-17
AI Technical Summary
Existing technologies for multi-stage absorption of sulfur dioxide in mineral slurries containing solid particles suffer from problems such as equipment blockage, increased pressure drop, severe inter-stage interference, and poor operational stability, making it difficult to achieve stable and efficient manganese resource recovery.
The system employs a multi-stage circulating absorption device, including independent absorption towers and storage tanks. Each module has an independent slurry circulation system, and sedimentation is prevented by a stirring system. The modules are connected in series through gas guide pipes, achieving modular design and independent operation.
It improves the sulfur dioxide removal rate and overall absorption efficiency, reduces maintenance difficulty and cost, ensures long-term stable operation of the unit, and adapts to different treatment needs.
Smart Images
Figure CN224126969U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of flue gas desulfurization and manganese resource recovery equipment, specifically a multi-stage circulating absorption device for sulfur dioxide. Background Technology
[0002] In the fields of manganese metallurgy, chemical industry, and environmental protection, the use of pyrolusite (mainly manganese dioxide) slurry to absorb sulfur dioxide from industrial flue gas is a wet process that integrates flue gas desulfurization and manganese resource recovery. The core of this process lies in the fact that the manganese dioxide slurry can efficiently absorb sulfur dioxide and, through an oxidation fixation reaction, primarily generate economically valuable manganese sulfate.
[0003] However, the industrial application of this technology has long faced a key challenge: how to construct a multi-stage absorption system capable of stably and efficiently processing slurries containing solid particles. Slurries containing solid particles are prone to settling and scaling in the absorption tower and circulation pipelines, leading to equipment blockage and increased pressure drop, which severely restricts the continuous operation cycle and processing efficiency of the unit.
[0004] Currently, the equipment solutions for multi-stage absorption treatment of sulfur dioxide can be mainly divided into the following two categories, but both have obvious shortcomings:
[0005] (1) Single-tower multi-stage absorption scheme
[0006] This scheme achieves multi-stage gas-liquid contact within a single absorption tower by setting up multiple layers of spray, internal baffles, or partitions.
[0007] High risk of slurry sedimentation and blockage: The complex internal components of the tower (such as baffles and packing support beams) provide a sedimentation platform for solid particles in the slurry, which can easily accumulate in dead corners, under components and in auxiliary pipes, leading to obstructed flow channels, increased system pressure loss, and extremely difficult maintenance and cleaning, which seriously affects the stability of long-term operation.
[0008] Severe interference between stages and low control precision: It is difficult to completely isolate the reaction zones of each stage physically, and the slurry is easy to mix. It is impossible to independently monitor and control the reaction conditions of each stage (such as slurry pH value, manganese ion concentration, solid content), resulting in uneven absorption efficiency at each stage and low overall resource utilization.
[0009] (2) Simple series connection scheme for multiple devices:
[0010] This scheme connects multiple independent absorption towers in series in the process flow. Each absorption tower contains pyrolusite slurry. The flue gas flows through each absorption tower in sequence, where sulfur dioxide is absorbed by the slurry. The absorption reaction of the pyrolusite slurry in the first-stage absorption tower reaches its endpoint first. Then, the pyrolusite slurry in the first-stage absorption tower is transferred to a chemical tank for further treatment. The pyrolusite slurry in each subsequent absorption tower is transferred to the previous absorption tower.
[0011] The use of interstage reflux causes the residue of the previous stage slurry to mix with the slurry of the next stage, affecting the uniformity of the slurry. Furthermore, the entire system has poor resistance to disturbance, and local deposition problems can affect the entire treatment system.
[0012] In summary, existing technologies for multi-stage sulfur dioxide absorption in the treatment of easily depositing slurries generally suffer from inherent defects such as weak anti-deposition capabilities, inability of each stage to operate independently, poor operational stability, and low modularity. Therefore, there is an urgent need for a multi-stage circulating absorption device with a rational structural design that can fundamentally prevent slurry deposition and enable independent, stable, and flexible operation of each stage. Summary of the Invention
[0013] The purpose of this invention is to provide a multi-stage circulating absorption device for sulfur dioxide, so as to solve at least one aspect of the problems and defects mentioned in the background art.
[0014] This utility model provides a multi-stage circulating absorption device for sulfur dioxide, including three or more sets of processing unit modules connected in series;
[0015] The processing unit module includes an absorption tower and a storage tank. The lower side wall of the absorption tower is provided with an air inlet, the top of the absorption tower is provided with an air outlet, the upper side wall of the absorption tower is provided with a slurry inlet, and the bottom of the absorption tower is provided with a slurry outlet. The upper part of the storage tank is provided with a slurry inlet, and the lower part of the storage tank is provided with a slurry outlet and a discharge outlet. The slurry outlet of the tower is connected to the slurry inlet of the tank through a gravity flow pipe, and the slurry outlet of the tank is connected to the slurry inlet of the tower through a slurry inlet pipe. The slurry inlet pipe is equipped with a circulation pump, and the storage tank is equipped with a stirring system.
[0016] The air outlet of the previous processing unit module is connected to the air inlet of the next processing unit module through a gas guide pipe.
[0017] A further embodiment: The absorption tower is equipped with a spraying device, which is located at the top of the absorption tower, and the main pipe of the spraying device is connected to the slurry inlet pipe.
[0018] A further embodiment: The absorption tower is equipped with a demister, which is located above the spraying device, and the outer wall of the demister is fixed to the inner wall of the absorption tower.
[0019] A further embodiment: The stirring system includes a stirring motor mounted on top of the storage tank, the output shaft of the stirring motor is connected to a stirring shaft, the stirring shaft extends into the storage tank and is connected to a stirring paddle, the stirring paddle being close to the bottom of the storage tank.
[0020] A further embodiment: The slurry outlet of the tower is located on the side wall of the absorption tower near the bottom plate, and the horizontal height of the slurry outlet is lower than the horizontal height of the air inlet.
[0021] A further embodiment: The bottom of the absorption tower is provided with a guide slope, and the slurry outlet of the tower is located at the bottom of the guide slope.
[0022] A further embodiment: The top of the absorption tower is shaped like an inverted funnel.
[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0024] 1. Each absorption tower has an independent external storage tank with stirring, and each absorption tower has a completely independent slurry circulation system, which avoids the mixing and interference of slurry between different absorption towers, improves the overall absorption efficiency and sulfur dioxide removal rate. After the slurry in the storage tank is transported into the absorption tower and fully contacts the flue gas, the slurry falls to the bottom of the tower and flows by gravity to the storage tank, where it can be fully stirred. This avoids the deposition and caking of solid particles at the bottom of the absorption tower or in the pipeline, making it particularly suitable for treating slurries containing solids such as manganese dioxide, ensuring long-term continuous and stable operation of the equipment.
[0025] 2. Adopting a modular "one tower, one reactor" design, the structure is clear and functions are decoupled. When a processing unit module needs inspection or maintenance, it can be isolated without affecting the operation of other processing unit modules, greatly reducing maintenance difficulty and cost. Processing unit modules can also be added or removed to easily adapt to different processing needs, resulting in a high degree of design standardization. Attached Figure Description
[0026] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.
[0027] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention.
[0028] Figure 2 This is a schematic diagram of the internal structure of the processing unit module in a preferred embodiment of the present invention.
[0029] In the diagram: 1-Absorption tower; 11-Air inlet; 12-Air outlet; 13-Slurry inlet of tower; 14-Slurry outlet of tower; 15-Spraying device; 16-Demister; 17-Guiding slope; 2-Storage vessel; 21-Slurry inlet of vessel; 22-Slurry outlet of vessel; 23-Slurry discharge port; 24-Agitator motor; 25-Agitator shaft; 26-Agitator paddle; 27-Slurry injection port; 3-Air inlet pipe; 4-Gas guiding pipe; 5-Slurry inlet pipe; 6-Circulation pump; 7-Gravity pipe; 8-Slurry discharge pipe; 9-Slurry injection pipe. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0032] In the description of this utility model, it should be understood that the use of terms such as "first" and "second" to define the components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model.
[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0034] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0035] Please see Figures 1-2 As shown, this utility model provides a multi-stage circulating absorption device for sulfur dioxide, comprising three or more treatment unit modules connected in series. Each treatment unit module includes an absorption tower 1 and a storage tank 2. The absorption tower 1 has an air inlet 11 on its lower side wall, an air outlet 12 on its top, a slurry inlet 13 on its upper side wall, and a slurry outlet 14 at its bottom. The storage tank 2 has a slurry inlet 21 on its upper part, a slurry outlet 22 and a slurry discharge outlet 23 on its lower part. The slurry outlet 14 is connected to the slurry inlet 21 via a gravity-flow pipe 7, and the slurry outlet 22 is connected to the slurry inlet 13 via a slurry inlet pipe 5. The slurry inlet pipe 5 is equipped with a circulating pump 6, and the storage tank 2 is equipped with a stirring system. The air outlet 12 of the previous treatment unit module is connected to the air inlet 11 of the next treatment unit module via a gas guiding pipe 4.
[0036] For example, please refer to Figure 1As shown, this embodiment sets up three sets of processing unit modules. The inlet 11 of the absorption tower 1 of the first set of processing unit modules located upstream is sealed and connected to the inlet pipe 3. The other end of the inlet pipe 3 is connected to the flue. The inlet pipe 3 is equipped with a gate. Opening the gate of the inlet pipe 3 can introduce the flue gas containing sulfur dioxide in the flue into the absorption tower 1 of the first set of processing unit modules. In the first set of absorption tower 1, the flue gas flows from bottom to top and flows through the outlet 12 in sequence through the second set of absorption tower 1 and the third set of absorption tower 1. The outlet 12 of the third set of absorption tower 1 is sealed and connected to the gas guide pipe 4. The other end of the third set of gas guide pipe 4 is sealed and connected to the gas discharge pipe. Each of the three processing unit modules has a storage tank 2 equipped with a grouting port 27 connected to the grouting pipe 9 and a grouting port 23 connected to the grouting discharge pipe 8. Both the grouting pipe 9 and the grouting pipe 8 are equipped with gate valves. Closing the gate valve of the grouting pipe 8 and opening the gate valve of the grouting pipe 9 allows the manganese dioxide slurry to be processed to be injected into the storage tank 2 for treatment. The stirring system is then activated to stir the slurry and prevent sedimentation. After injecting the preset amount of slurry, the gate valve of the grouting pipe 9 is closed. The circulating pump 6 introduces the slurry from the storage tank 2 into the absorption tower 1, and then opens the gate valve of the air inlet pipe 3. As the slurry falls from top to bottom, it fully contacts and reacts with the flue gas flowing from bottom to top, absorbing sulfur dioxide in the flue gas to achieve flue gas purification and simultaneously generating manganese sulfate as a product. The slurry falling to the bottom of absorption tower 1 flows into storage tank 2 via gravity pipe 7, where it is thoroughly stirred. This prevents solid particles from depositing or caking at the bottom of absorption tower 1 or in the pipes, making it particularly suitable for treating slurries containing solids such as manganese dioxide, ensuring long-term continuous and stable operation of the unit. The flue gas reacts counter-currently with the slurry in the first absorption tower 1. Residual gas that is not completely absorbed is discharged from the gas guide pipe 4 at the top of the first absorption tower 1 and enters the bottom of the second absorption tower 1. This process continues, with absorption occurring stage by stage, until the final qualified exhaust gas is discharged from the outlet at the top of the third absorption tower 1. The slurry in each processing unit module circulates within the corresponding absorption tower 1 and storage tank 2. After reacting with the flue gas in the absorption tower 1, the slurry flows back to the storage tank 2 and is transported back to the absorption tower 1 to react with the flue gas again. After multiple cycles, slurry samples are taken from each storage tank 2 and filtered through the discharge pipe 8 to obtain yellow-brown slag. The manganese content in the slag is analyzed to determine whether the slurry needs to be replaced. Preferably, when the manganese content of the slag in the first and second sets of storage tanks 2 is detected to be no more than 1.25%, the gate of the air inlet pipe 3 is closed, the corresponding circulation pump 6 is shut down, and the gate of the discharge pipe 8 of the corresponding storage tank 2 is opened, transferring the slurry (i.e., the reaction product) in the storage tank 2 to the chemical reaction tank for the next processing step. After the slurry (i.e., the reaction product) in the storage tank 2 has been discharged, the gate of the discharge pipe 8 is closed, and a preset amount of slurry to be treated is re-injected through the injection pipe 9 for the next round of processing.For the third set of storage tanks 2, when the manganese content in the slag is detected to be no more than 5%, the slurry is replaced so that the third set of storage tanks 2 has sufficient manganese dioxide to absorb sulfur dioxide.
[0037] Each absorption tower 1 has an independent external storage tank 2 with stirring. Each absorption tower 1 has a completely independent slurry circulation system. The slurry in each group of processing unit modules circulates only within the absorption tower 1 and storage tank 2 of the group, realizing the independence of each absorption tower 1. The state of the slurry in each storage tank 2 can be independently sampled, tested and replaced, avoiding the mixing and interference of slurry between different absorption towers 1, and improving the overall absorption efficiency and sulfur dioxide removal rate.
[0038] The system adopts a modular design with one tower and one reactor, resulting in a clear structure and functional decoupling. When a processing unit module requires inspection or maintenance, it can be isolated and connected in series with four other operating processing unit modules via gas flow pipes. This does not affect the operation of the other processing unit modules, significantly reducing maintenance difficulty and cost. Furthermore, processing unit modules can be added or removed to easily adapt to different processing needs, demonstrating a high degree of design standardization.
[0039] Preferably, please refer to Figure 2 As shown, the absorption tower 1 is equipped with a spray device 15, which is located at the top of the absorption tower 1. The spray device 15 is existing technology, and its structure and working principle will not be described in detail. It mainly includes a main pipe, several sub-pipes connected to the main pipe, and several nozzles installed on and connected to the sub-pipes. The main pipe of the spray device 15 is connected to the slurry inlet pipe 5. The circulating pump 6 introduces the slurry in the storage tank 2 into the main pipe of the spray device 15, and guides the slurry through the sub-pipes to the nozzles. The slurry is uniformly atomized and sprayed into the absorption tower 1 through the nozzles, where it undergoes a countercurrent contact reaction with the flue gas flowing from bottom to top, maintaining a highly efficient gas-liquid mass transfer reaction.
[0040] Preferably, please refer to Figure 2 As shown, the absorption tower 1 is equipped with a demister 16, which is located above the spray device 15. The outer wall of the demister 16 is fixed to the inner wall of the absorption tower 1. The demister 16 is existing technology, and its structure and working principle will not be described in detail. The demister 16 is located in the inner cavity of the absorption tower 1 and crosses the inner cavity of the absorption tower 1, and is used to remove mineral slurry droplets entrained in the flue gas.
[0041] Preferably, the slurry outlet 14 is located on the side wall of the absorption tower 1 near the bottom plate. The horizontal height of the slurry outlet 14 is lower than the horizontal height of the air inlet 11, which facilitates the slurry sprayed into the absorption tower 1 to flow out of the absorption tower 1 by itself, while avoiding the slurry from blocking the air inlet 11.
[0042] In some embodiments, please refer to Figure 2As shown, the stirring system includes a stirring motor 24 mounted on top of the storage tank 2. The output shaft of the stirring motor 24 is connected to a stirring shaft 25, which extends into the storage tank 2 and is connected to a stirring paddle 26. The stirring paddle 26 is located near the bottom of the storage tank 2. The stirring motor 24 is located outside the storage tank 2, and the stirring shaft 25 penetrates the top wall of the storage tank 2 and enters the storage tank 2, with the penetration point kept sealed. When the stirring motor 24 is started, it drives the stirring shaft 25, which in turn drives the stirring paddle 26 to rotate, thus stirring the slurry in the storage tank 2 and preventing the sedimentation of solid particles in the slurry.
[0043] In some embodiments, please refer to Figure 2 As shown, the bottom of the absorption tower 1 is provided with a guide slope 17, and the tower outlet 14 is located at the bottom of the guide slope 17, so that the slurry in the absorption tower 1 can flow out of the absorption tower 1 by gravity.
[0044] In some embodiments, please refer to Figure 1 , Figure 2 As shown, the top of the absorption tower 1 is an inverted funnel shape, which facilitates the gathering of flue gas towards the outlet 12.
[0045] It should be noted that the device is equipped with sealing measures at all points that require sealing. The sealing measures are selected from existing technologies, and the gates at each point are also from existing technologies.
[0046] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.
Claims
1. A multi-stage circulating sulfur dioxide absorption apparatus, characterized by comprising: Includes three or more sets of processing unit modules connected in series; The processing unit module includes an absorption tower and a storage tank. The lower side wall of the absorption tower is provided with an air inlet, the top of the absorption tower is provided with an air outlet, the upper side wall of the absorption tower is provided with a slurry inlet, and the bottom of the absorption tower is provided with a slurry outlet. The upper part of the storage tank is provided with a slurry inlet, and the lower part of the storage tank is provided with a slurry outlet and a discharge outlet. The slurry outlet of the tower is connected to the slurry inlet of the tank through a gravity flow pipe, and the slurry outlet of the tank is connected to the slurry inlet of the tower through a slurry inlet pipe. The slurry inlet pipe is equipped with a circulation pump, and the storage tank is equipped with a stirring system. The air outlet of the previous processing unit module is connected to the air inlet of the next processing unit module through a gas guide pipe.
2. A multi-stage SO2 absorption device according to claim 1, wherein The absorption tower is equipped with a spraying device, which is located at the top of the absorption tower. The main pipe of the spraying device is connected to the slurry inlet pipe.
3. A multi-stage SO2 absorption device according to claim 2, wherein The absorption tower is equipped with a demister, which is located above the spraying device. The outer wall of the demister is fixed to the inner wall of the absorption tower.
4. A multi-stage SO2 absorption device according to claim 1, wherein The stirring system includes a stirring motor installed on the top of the storage tank. The output shaft of the stirring motor is connected to a stirring shaft, which extends into the storage tank and is connected to a stirring paddle. The stirring paddle is located near the bottom of the storage tank.
5. A multi-stage SO2 absorption device according to claim 1, wherein The slurry outlet of the tower is located on the side wall of the absorption tower near the bottom plate, and the horizontal height of the slurry outlet is lower than the horizontal height of the air inlet.
6. A multi-stage SO2 absorption device according to claim 1 or 5, wherein The bottom of the absorption tower is provided with a guide slope, and the slurry outlet of the tower is located at the bottom of the guide slope.
7. A multi-stage SO2 absorption device according to claim 1, wherein The top of the absorption tower is shaped like an inverted funnel.