A multi-stage high-efficiency seawater recovery system for seawater desulfurization

Abstract

The application provides a multi-stage efficient seawater recovery system for seawater desulfurization, and relates to the technical field of seawater desulfurization, which comprises an aeration tank, an aeration zone is arranged in the aeration tank, the aeration zone is provided with a plurality of layers, one end of the aeration zone of the bottom layer is provided with a water inlet zone, a backflow zone is arranged at the connection of two adjacent groups of the aeration zone, and one end of the aeration zone of the top layer, which is away from the backflow zone, is provided with a water outlet zone; a longitudinal partition wall is arranged in the aeration zone along the water flow direction, the longitudinal partition wall divides the aeration zone into a plurality of independent flow channels, and a first-stage aeration device is arranged below the aeration zone of the bottom layer; the aeration tank is folded and arranged with two or more layers of aeration zones in the vertical direction, air is gathered and utilized in multiple stages, the aeration efficiency of air is greatly improved, the required air volume is greatly reduced due to the improved utilization efficiency of air, the total energy consumption of the aeration system can be greatly reduced, and the energy-saving effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of seawater desulfurization technology, and in particular to a multi-stage high-efficiency seawater recovery system for seawater desulfurization. Background Technology

[0002] In the seawater-based flue gas desulfurization process for coal-fired power plants and industrial boiler exhaust gases, the seawater recovery system is an important system in the desulfurization process. The desulfurized seawater is treated by the seawater recovery system to meet the local seawater quality standards before being discharged into the sea.

[0003] In seawater restoration systems, aeration blowers supply air to aeration devices installed in aeration tanks to aerate the seawater. Aeration tanks typically occupy a large area. The energy consumption of the aeration blowers accounts for a significant portion of the overall energy consumption of the desulfurization process. Therefore, reducing the footprint of aeration tanks, lowering the energy consumption of aeration blowers, and significantly reducing the construction and operating costs of seawater desulfurization systems are problems that need to be solved. Thus, this invention proposes a multi-stage, high-efficiency seawater restoration system for seawater desulfurization to address the problems existing in the prior art. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a multi-stage high-efficiency seawater restoration system for seawater desulfurization. This system can improve the utilization efficiency of air in water and reduce the air consumption of the aeration system, thereby achieving energy conservation. At the same time, the recirculating aeration zone can significantly reduce the floor space of the aeration tank, saving land resources and reducing construction costs.

[0005] To achieve the purpose of this invention, the invention is implemented through the following technical solution: a multi-stage high-efficiency seawater restoration system for seawater desulfurization, including an aeration tank, wherein the aeration tank is provided with an aeration zone inside, and the aeration zone is provided with several layers, one end of the bottom aeration zone is provided with a water inlet zone, the connection between two adjacent aeration zones is provided with a backflow zone, and the end of the top aeration zone away from the backflow zone is provided with a drainage zone.

[0006] The aeration zone is equipped with longitudinal partitions along the water flow direction, which divide the aeration zone into several independent flow channels. The bottom layer of the aeration zone is equipped with a primary aeration device, which is connected to an air supply component. Adjacent aeration zones are separated by a bottom plate, which has openings. The aeration zone above the openings is equipped with a secondary aeration device, and the aeration zone below the bottom plate forms an air gathering area.

[0007] A further improvement is that a first inlet weir is provided between the water inlet zone and the aeration zone at the bottom layer, and the first inlet weir is used to evenly distribute the water inlet to the aeration zone at the bottom layer.

[0008] A further improvement is that a effluent weir is provided between the backflow zone and the aeration zone below, and the effluent weir is used to regulate and evenly distribute the drainage flow of each channel in the aeration zone below.

[0009] A further improvement is that a second inlet weir is provided between the backflow zone and the aeration zone above, and the second inlet weir is used to regulate and evenly distribute the flow rate of water entering each channel in the aeration zone above.

[0010] A further improvement is that a drainage weir is provided between the aeration zone and the drainage zone of the top layer, and the drainage weir is used to regulate the flow rate of drainage from each channel in the aeration zone of the top layer.

[0011] A further improvement is that the air gathering area is formed between the bottom plate of the pool and the walls of the first inlet weir, the outlet weir, and the aeration tank, and the air gathering area is a bowl-shaped semi-enclosed area.

[0012] A further improvement is that the air supply component includes an aeration blower and a conveying pipe. The aeration blower is located outside the aeration tank, and the output end of the aeration blower is connected to the conveying pipe. The output end of the conveying pipe is connected to the primary aeration device.

[0013] Further improvements include: the aeration blower is a high-pressure blower, and the conveying pipeline is a fiberglass pipe or a corrosion-resistant metal pipe.

[0014] A further improvement is that the height of the aeration zone is 2-6m, and the depth of the air gathering zone is 0.5-1.5m.

[0015] A further improvement is that the diameter of the aeration holes in the primary aeration device is between 0.1 and 6 mm, and the diameter of the aeration holes in the secondary aeration device is between 1 and 8 mm.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. This invention delivers compressed air to the primary aeration device via an air supply component. The compressed air enters the bottom aeration zone through aeration holes. Due to the buoyancy of the seawater, the aerated bubbles rise to the top of the bottom aeration zone, reaching the air collection area. In this area, air and water separate. The separated air then enters the next-stage secondary aeration device through openings in the bottom plate above the aeration zone, where it is further divided into smaller bubbles and enters the second-stage aeration zone until it overflows onto the water surface. Because the aeration tank has two or more layers of aeration zones arranged vertically, the aeration air is collected and utilized multiple times, significantly improving the aeration efficiency. This increased air utilization efficiency greatly reduces the required air volume, resulting in a significant reduction in the overall energy consumption of the aeration system and achieving energy savings.

[0018] 2. The present invention uses a series of recirculating aeration zones constructed in a recirculating zone connection manner, which can significantly reduce the land area occupied by the aeration tank and save valuable land resources. Attached Figure Description

[0019] Figure 1 This is a schematic longitudinal cross-sectional view of the two-stage aeration tank of the present invention;

[0020] Figure 2 This is a schematic diagram of the two-stage aeration tank of the present invention.

[0021] Figure 3 This is a schematic cross-sectional view of the two-stage aeration tank of the present invention;

[0022] Figure 4 This is a schematic diagram of the arrangement of the secondary aeration device of the present invention;

[0023] Figure 5 This is a schematic longitudinal cross-sectional view of the three-stage aeration tank of the present invention;

[0024] Figure 6 This is a schematic plan view of the three-stage aeration tank of the present invention;

[0025] Figure 7 This is a schematic cross-sectional view of the three-stage aeration tank of the present invention.

[0026] The components include: 1. Aeration tank; 2. Aeration zone; 3. Inlet zone; 4. Backflow zone; 5. Drainage zone; 6. Longitudinal partition wall; 7. Primary aeration device; 8. Opening; 9. Secondary aeration device; 10. Air collection area; 11. First inlet weir; 12. Outlet weir; 13. Second inlet weir; 14. Drainage weir; 15. Aeration blower; 16. Conveying pipeline; 17. Tank bottom plate. Detailed Implementation

[0027] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0028] Example 1

[0029] according to Figure 1 , 2 As shown in Figures 3 and 4, this embodiment proposes a multi-stage, high-efficiency seawater restoration system for seawater desulfurization:

[0030] Two-stage aeration method

[0031] The structure of aeration tank 1 is mainly composed of reinforced concrete.

[0032] like Figure 2As shown, longitudinal partition walls 6 are installed in the aeration zone 2 along the water flow direction, dividing the aeration zone 2 into several independent flow channels.

[0033] like Figure 1 As shown, the inlet zone 3 is located at the bottom of the aeration tank 1, and a first inlet weir 11 is provided between the inlet zone 3 and the first-stage aeration zone 2 to evenly distribute the inlet flow of the aeration zone 2.

[0034] A weir 12 is installed between the first-stage aeration zone 2 and the return flow zone 4 to regulate the flow rate of each channel in the aeration zone 2, so as to ensure the uniformity of water volume in each channel.

[0035] A second inlet weir 13 is provided between the backflow zone 4 and the second-stage aeration zone 2 to regulate the flow rate of each channel in the second-stage aeration zone 2.

[0036] A drainage weir 14 is provided between the second-stage aeration zone 2 and the drainage zone 5 to regulate the flow rate of each channel in the second-stage aeration zone 2.

[0037] The air gathering area 10 is formed between the bottom plate 17 of the pool and the walls of the first inlet weir 11, the outlet weir 12, and the aeration tank 1. The air gathering area 10 is a bowl-shaped semi-enclosed area that uses gravity to achieve air-water separation and gathers the air after aeration.

[0038] like Figure 3 As shown, the aeration blower 15 installed on the aeration tank 1 sends compressed air through the conveying pipe 16 into the primary aeration device 7, and then into the first-stage aeration zone 2 through the aeration holes on the aeration pipe. The aerated air bubbles rise to the top of the first-stage aeration zone 2, into the air collection area 10, where air and water separate. The separated air enters the secondary aeration device 9 through the openings 8 on the bottom plate 17 of the second-stage aeration zone 2. After passing through the secondary aeration device 9, the air is further divided into small bubbles, which enter the second-stage aeration zone 2 and overflow onto the water surface.

[0039] The aeration blower 15 is a high-efficiency high-pressure blower.

[0040] The conveying pipeline 16 shall be made of fiberglass or corrosion-resistant metal.

[0041] like Figure 4 As shown, in the bottom plate 17, the air that has been separated and gathered enters the main pipe of the corresponding aeration device through the opening 8, and then enters the aeration device for aeration again.

[0042] The height of each aeration zone is generally between 2 and 6 meters.

[0043] Except for the top aeration zone 2, the depth of the air collection area 10 formed above aeration zone 2 is between 0.5 and 1.5 meters.

[0044] The aeration holes of the aeration devices are as follows: the diameter of the aeration holes in the primary aeration device 7 is between 0.1-6 mm, and the diameter of the aeration holes in the secondary aeration device 9 is between 1-8 mm. The total area of ​​the openings in the aeration devices should increase progressively.

[0045] Example 2

[0046] according to Figure 4 , 5 As shown in Figures 6 and 7, this embodiment proposes a multi-stage, high-efficiency seawater restoration system for seawater desulfurization:

[0047] Three-stage aeration method

[0048] The aeration tank structure is mainly composed of reinforced concrete.

[0049] like Figure 6 As shown, longitudinal partition walls 6 are installed in the aeration zone 2 along the water flow direction, dividing the aeration zone 2 into several independent flow channels.

[0050] like Figure 5 As shown, the inlet zone 3 is located at the bottom of the aeration tank 1, and a first inlet weir 11 is provided between the inlet zone 3 and the first-stage aeration zone 2 to evenly distribute the inlet flow of the aeration zone 2.

[0051] A weir 12 is installed between the first-stage aeration zone 2 and the return flow zone 4 to regulate the flow rate of each channel in the aeration zone 2, so as to ensure the uniformity of water volume in each channel.

[0052] A second inlet weir 13 is provided between the backflow zone 4 and the second-stage aeration zone 2 to regulate the flow rate of each channel in the second-stage aeration zone 2.

[0053] A weir 12 is provided between the second-stage aeration zone 2 and the subsequent return zone 4 to regulate the flow rate of each channel in the second-stage aeration zone 2.

[0054] A second inlet weir 13 is provided between the backflow zone 4 and the third-stage aeration zone 2 to regulate the flow rate of each channel in the third-stage aeration zone 2.

[0055] A drainage weir 14 is provided between the third-stage aeration zone 2 and the drainage zone 5 to regulate the flow rate of each channel in the third-stage aeration zone 2 and ensure that the flow rate in each channel is uniform.

[0056] In each aeration zone 2, an air gathering area 10 is formed between the bottom plate 17 and the first inlet weir 11, outlet weir 12, and the walls of the aeration tank 1. The air gathering area 10 is a bowl-shaped semi-enclosed area that uses gravity to achieve air-water separation and gathers the air after aeration in the previous stage.

[0057] like Figure 7 As shown, the aeration blower 15 installed on the aeration tank 1 sends compressed air through the conveying pipe 16 into the primary aeration device 7, and then into the first-stage aeration zone 2 through the aeration holes on the aeration pipe. The aerated air bubbles rise to the top of the first-stage aeration zone 2, where air and water separate in the air collection area 10. The separated air then enters the secondary aeration device 9 inside the second-stage aeration zone 2 through the openings 8 on the bottom plate 17. After passing through the secondary aeration device 9, the air is further divided into small bubbles and enters the second-stage aeration zone 2.

[0058] The air separated in the upper part of the second-stage aeration zone 2 enters the secondary aeration device 9 inside the third-stage aeration zone 2 through the opening 8 on the bottom plate 17. After passing through the aeration device, the air is further divided into small bubbles, enters the third-stage aeration zone 2, and overflows onto the water surface.

[0059] The aeration blower 15 is a high-efficiency high-pressure blower.

[0060] The conveying pipeline 16 shall be made of fiberglass or corrosion-resistant metal.

[0061] like Figure 4 As shown, in the bottom plate 17, the air that has been separated and gathered enters the main pipe of the corresponding aeration device through the opening 8, and then enters the aeration device for aeration again.

[0062] The aeration process of the aeration device in the lower part of the third-stage aeration zone 2 is the same as that of the aeration device in the second-stage aeration zone 2.

[0063] The height of each aeration zone is generally between 2 and 6 meters.

[0064] Except for the top aeration zone 2, the depth of the air collection area 10 formed above aeration zone 2 is between 0.5 and 1.5 meters.

[0065] The aeration holes of the aeration devices are as follows: the diameter of the aeration holes in the primary aeration device 7 is between 0.1-6 mm, and the diameter of the aeration holes in the secondary aeration device 9 is between 1-8 mm. The total area of ​​the openings in the aeration devices should increase progressively.

[0066] This multi-stage high-efficiency seawater restoration system for seawater desulfurization delivers compressed air through an air supply component to the primary aeration device 7. The air then enters the bottom aeration zone 2 through aeration holes. Due to seawater buoyancy, the aerated bubbles rise to the top of the bottom aeration zone 2, reaching the air collection area 10. In this area, air and water separate. The separated air then enters the next stage, the secondary aeration device 9, through openings in the bottom plate 17 above the bottom aeration zone 2. There, it is further divided into smaller bubbles and enters the second-stage aeration zone 2 until it overflows onto the water surface. Because the aeration tank 1 has two or more layers of aeration zones 2 arranged vertically, the aeration air is collected and utilized multiple times, significantly improving aeration efficiency. This increased air utilization efficiency drastically reduces the required air volume, resulting in a significant reduction in overall aeration system energy consumption, achieving an energy saving effect of 10-20%. The present invention uses a series of recirculating aeration zones 2 constructed in a recirculating zone 4, which can significantly reduce the land area of ​​the aeration tank 1 and save valuable land resources. The two-layer aeration scheme can save about 50% of the land area, the three-layer aeration scheme can save about 65% of the land area, and the four-layer aeration scheme can save more than 70% of the land area. From the perspective of actual construction economy, it is advisable to not exceed four layers.

[0067] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage high-efficiency seawater restoration system for seawater desulfurization, comprising an aeration tank (1), characterized in that: The aeration tank (1) is provided with an aeration zone (2) inside, and the aeration zone (2) is provided with several layers. The bottom aeration zone (2) is provided with an inlet zone (3) at one end, and a backflow zone (4) is provided at the connection between two adjacent aeration zones (2). The top aeration zone (2) is provided with a drainage zone (5) at the end away from the backflow zone (4). The aeration zone (2) is provided with a longitudinal partition wall (6) along the water flow direction, and the longitudinal partition wall (6) divides the aeration zone (2) into several independent flow channels. The bottom of the aeration zone (2) is provided with a primary aeration device (7) and the primary aeration device (7) is connected to the air supply component. The two adjacent aeration zones (2) are separated by a bottom plate (17) and an opening (8) is provided on the bottom plate (17). A secondary aeration device (9) is provided in the aeration zone (2) above the opening (8). An air gathering area (10) is formed in the aeration zone (2) below the bottom plate (17). The height of the aeration zone (2) is 2-6m, the depth of the air gathering area (10) is 0.5-1.5m, the diameter of the aeration hole opening of the primary aeration device (7) is between 0.1-6mm, and the diameter of the aeration hole opening of the secondary aeration device (9) is 1-8mm. A first inlet weir (11) is provided between the water inlet zone (3) and the aeration zone (2) at the bottom layer, and the first inlet weir (11) is used to evenly distribute the water inlet of the aeration zone (2) at the bottom layer; A water outlet weir (12) is provided between the backflow zone (4) and the aeration zone (2) below, and the water outlet weir (12) is used to regulate and evenly distribute the flow rate of each channel of the aeration zone (2) below. A second inlet weir (13) is provided between the backflow zone (4) and the aeration zone (2) above, and the second inlet weir (13) is used to regulate the flow rate of water entering each channel in the aeration zone (2) above. A drainage weir (14) is provided between the aeration zone (2) and the drainage zone (5) at the top layer, and the drainage weir (14) is used to regulate the flow rate of drainage from each channel in the aeration zone (2) at the top layer; The air gathering area (10) is formed between the bottom plate (17) and the walls of the first inlet weir (11), the outlet weir (12), and the aeration tank (1), and the air gathering area (10) is a bowl-shaped semi-enclosed area.

2. The multi-stage high-efficiency seawater restoration system for seawater desulfurization according to claim 1, characterized in that: The air supply assembly includes an aeration blower (15) and a conveying pipe (16). The aeration blower (15) is located outside the aeration tank (1), and the output end of the aeration blower (15) is connected to the conveying pipe (16). The output end of the conveying pipe (16) is connected to the primary aeration device (7).

3. A multi-stage high-efficiency seawater restoration system for seawater desulfurization according to claim 2, characterized in that: The aeration blower (15) is a high-pressure blower, and the conveying pipe (16) is a fiberglass pipe or a corrosion-resistant metal pipe.

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