Multi-stage efficient seawater recovery system for seawater desulfurization

Abstract

The invention provides a multistage high-efficiency seawater recovery system for seawater desulfurization, and relates to the technical field of seawater desulfurization, the multistage high-efficiency seawater recovery system comprises an aeration tank, a plurality of layers of aeration areas are arranged in the aeration tank, a water inlet area is arranged at one end of the aeration area at the bottom layer, a backflow area is arranged at the communication part of two adjacent groups of aeration areas, and a water outlet area is arranged at the other end of the aeration area at the bottom layer. A drainage area is arranged at one end, far away from the backflow area, of the aeration area on the top layer; longitudinal partition walls are arranged in the aeration area in the water flow direction and divide the aeration area into a plurality of independent flow channels, and a first-stage aeration device is arranged on the lower portion of the interior of the aeration area on the bottom layer. Two or more layers of aeration areas are arranged in the aeration tank in the vertical direction in a folding manner, so that the aeration air is gathered and then is repeatedly utilized in a gradient manner, the aeration efficiency of the air can be greatly improved, the utilization efficiency of the air is improved, the required air volume is greatly reduced, the total energy consumption of the aeration system can be greatly reduced, and the energy-saving effect is realized.

Description

Technical Field

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

[0002] In the seawater flue gas desulfurization process of coal-fired power plants and industrial boiler exhaust, the seawater recovery system is an important system in the desulfurization process system. The desulfurized seawater is treated by the seawater recovery system and is discharged into the sea after meeting the local seawater quality standards.

[0003] In the seawater recovery system, an aeration fan introduces air into an aeration device arranged in an aeration tank to aerate the seawater. Usually, the aeration tank occupies a large area. The energy consumption of the aeration fan accounts for a large proportion compared to the energy consumption of the entire desulfurization process system. How to reduce the area occupied by the aeration tank, reduce the energy consumption of the aeration fan, and significantly reduce the construction cost and operation cost of the seawater desulfurization system are problems to be solved. Therefore, the present invention proposes a multi-stage and high-efficiency seawater recovery system for seawater desulfurization to solve the problems existing in the prior art. Summary of the invention

[0004] In view of the above problems, the present invention proposes a multi-stage and high-efficiency seawater recovery system for seawater desulfurization, which can improve the utilization efficiency of air in water and reduce the air consumption of the aeration system, thereby achieving energy saving; at the same time, the return aeration zone can greatly reduce the floor area of ​​the aeration tank, save land resources, and reduce construction costs.

[0005] To achieve the purpose of the present invention, the present invention is implemented by the following technical scheme: a multi-stage high-efficiency seawater recovery system for seawater desulfurization, comprising an aeration tank, wherein an aeration zone is provided inside the aeration tank, and the aeration zone is provided with several layers, one end of the aeration zone of the bottom layer is provided with a water inlet zone, a reflux zone is provided at the connection point of two adjacent groups of aeration zones, and one end of the aeration zone of the top layer away from the reflux zone is provided with a drainage zone; A longitudinal partition wall is arranged in the aeration zone along the water flow direction, and the longitudinal partition wall divides the aeration zone into a plurality of independent flow channels. A primary aeration device is arranged below the aeration zone on the bottom layer, and the primary aeration device is connected to an air supply assembly. Two adjacent groups of aeration zones are separated by a pool bottom plate, and an opening is arranged on the pool bottom plate. A secondary aeration device is arranged in the aeration zone above the opening, and an air convergence area is formed in the aeration zone below the pool bottom plate.

[0006] A further improvement is that a first water inlet weir is provided between the water inlet area and the aeration area of ​​the bottom layer, and the first water inlet weir is used to evenly distribute the water inlet of the aeration area of ​​the bottom layer.

[0007] A further improvement is that a water outlet weir is provided between the reflux zone and the aeration zone below, and the water outlet weir is used to adjust the flow rate of drainage of each flow channel of the aeration zone below to be uniform.

[0008] A further improvement is that a second water inlet weir is provided between the reflux zone and the aeration zone above, and the second water inlet weir is used to adjust the flow rate of water entering each flow channel in the aeration zone above to be uniform.

[0009] A further improvement is that a drainage weir is provided between the aeration area and the drainage area of ​​the top layer, and the drainage weir is used to adjust the flow rate of drainage of each flow channel in the aeration area of ​​the top layer.

[0010] A further improvement is that the air gathering area is formed between the pool bottom plate and the first water inlet weir, the water outlet weir and the pool wall of the aeration pool, and the air gathering area is a bowl-shaped semi-enclosed area.

[0011] A further improvement is that the air supply assembly includes an aeration fan and a delivery pipeline, the aeration fan is arranged outside the aeration tank, and the output end of the aeration fan is connected to the delivery pipeline, and the output end of the delivery pipeline is connected to the first-level aeration device.

[0012] A further improvement is that the aeration fan is a high-pressure fan, and the delivery pipeline is a glass fiber reinforced plastic pipeline or a corrosion-resistant metal pipeline.

[0013] A further improvement is that the height of the aeration zone is 2-6 m, and the depth of the air convergence area is 0.5-1.5 m.

[0014] A further improvement is that the diameter of the aeration holes of the first-stage aeration device is between 0.1 and 6 mm, and the diameter of the aeration holes of the second-stage aeration device is between 1 and 8 mm.

[0015] The beneficial effects of the present invention are: 1. The present invention sends compressed air into a primary aeration device through an air supply assembly, and enters the aeration zone of the bottom layer through an aeration hole. Under the buoyancy of seawater, aerated bubbles float to the top of the aeration zone of the bottom layer to the air collection area, where air and water are separated. The separated air passes through the openings on the pool bottom plate above the aeration zone and enters the secondary aeration device of the next level, where it is divided into small bubbles again and enters the second-level aeration zone until it overflows on the water surface. Since two or more layers of aeration zones are folded and arranged in the vertical direction in the aeration pool, the aeration air is gathered and utilized in multiple stages, which can greatly improve the aeration efficiency of the air. Since the utilization efficiency of the air is improved, the required air volume is greatly reduced, and the total energy consumption of the aeration system can be greatly reduced, achieving energy-saving effects.

[0016] 2. The present invention adopts a plurality of return aeration zones constructed in the form of reflux zone connection, which can greatly reduce the floor space of the aeration tank and save precious land resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the longitudinal section of the two-stage aeration tank of the present invention; Figure 2 It is a schematic plan view of a two-stage aeration tank of the present invention; Figure 3 It is a schematic cross-sectional view of a two-stage aeration tank of the present invention; Figure 4 It is a schematic diagram of the arrangement of the secondary aeration device of the present invention; Figure 5 It is a longitudinal cross-sectional schematic diagram of a three-stage aeration tank of the present invention; Figure 6 It is a schematic plan view of a three-stage aeration tank of the present invention; Figure 7 It is a schematic cross-sectional view of the three-stage aeration tank of the present invention.

[0018] Among them: 1. Aeration tank; 2. Aeration area; 3. Water inlet area; 4. Backflow area; 5. Drainage area; 6. Longitudinal partition wall; 7. Primary aeration device; 8. Opening; 9. Secondary aeration device; 10. Air gathering area; 11. First water inlet weir; 12. Water outlet weir; 13. Second water inlet weir; 14. Drainage weir; 15. Aeration fan; 16. Delivery pipeline; 17. Pool bottom plate. DETAILED DESCRIPTION

[0019] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0020] Embodiment 1 according to Figure 1 , 2 As shown in , 3, and 4, this embodiment proposes a multi-stage high-efficiency seawater recovery system for seawater desulfurization: Two-stage aeration The structure of aeration tank 1 is mainly composed of reinforced concrete.

[0021] like Figure 2 As shown, a longitudinal partition wall 6 is arranged in the aeration zone 2 along the water flow direction, dividing the aeration zone 2 into a plurality of independent flow channels.

[0022] like Figure 1 As shown, the water inlet area 3 is arranged at the bottom layer of the aeration tank 1 , and a first water inlet weir 11 is arranged between the water inlet area 3 and the first-stage aeration area 2 to evenly distribute the water inlet flow of the aeration area 2 .

[0023] An outlet weir 12 is provided between the first-stage aeration zone 2 and the reflux zone 4 to adjust the flow rate of each flow channel in the aeration zone 2 to ensure uniform water volume in each flow channel.

[0024] A second water inlet weir 13 is provided between the reflux zone 4 and the second-stage aeration zone 2 to adjust the flow rate of each flow channel in the second-stage aeration zone 2 .

[0025] A drainage weir 14 is provided between the second-stage aeration zone 2 and the drainage zone 5 to adjust the flow rate of each flow channel in the second-stage aeration zone 2 .

[0026] Among them, the air gathering area 10 is formed between the pool bottom plate 17 and the first water inlet weir 11, the water outlet weir 12, and the pool wall of the aeration pool 1, and the air gathering area 10 is a bowl-shaped semi-enclosed area, which uses gravity to achieve air-water separation and gather aerated air.

[0027] like Figure 3 As shown, the aeration fan 15 arranged on the aeration tank 1 delivers the compressed air to the primary aeration device 7 through the delivery pipe 16, and enters the first-level aeration zone 2 through the aeration holes on the aeration pipe. The aerated bubbles float to the top of the first-level aeration zone 2, the air collection area 10, where the air and water are separated; the separated air passes through the opening 8 on the bottom plate 17 of the second-level aeration zone 2 and enters the secondary aeration device 9. After passing through the secondary aeration device 9, the air is once again divided into small bubbles, enters the second-level aeration zone 2, and overflows on the water surface.

[0028] The aeration fan 15 adopts a high-efficiency high-pressure fan.

[0029] The delivery pipeline 16 is made of glass fiber reinforced plastic pipeline or corrosion-resistant metal pipeline.

[0030] like Figure 4 As shown, in the pool bottom plate 17, the separated air is collected and separated through the openings 8 and enters the corresponding main pipe of the aeration device, thereby entering the aeration device for further aeration.

[0031] The height of each aeration zone 2 is generally between 2 and 6 meters.

[0032] Except for the top aeration zone 2, the depth of the air collection area 10 formed in the upper part of the aeration zone 2 is between 0.5 and 1.5 meters.

[0033] The diameter of the aeration holes of the aeration device is between 0.1-6 mm for the first-stage aeration device 7 and between 1-8 mm for the second-stage aeration device 9. The total area of ​​the aeration holes should be increased step by step.

[0034] Embodiment 2 according to Figure 4 , 5 As shown in , 6, and 7, this embodiment proposes a multi-stage high-efficiency seawater recovery system for seawater desulfurization: Three-stage aeration system The aeration tank structure is mainly composed of reinforced concrete.

[0035] like Figure 6 As shown, a longitudinal partition wall 6 is arranged in the aeration zone 2 along the water flow direction, dividing the aeration zone 2 into a plurality of independent flow channels.

[0036] like Figure 5 As shown, the water inlet area 3 is arranged at the bottom layer of the aeration tank 1 , and a first water inlet weir 11 is arranged between the water inlet area 3 and the first-stage aeration area 2 to evenly distribute the water inlet flow of the aeration area 2 .

[0037] An outlet weir 12 is provided between the first-stage aeration zone 2 and the reflux zone 4 to adjust the flow rate of each flow channel in the aeration zone 2 to ensure uniform water volume in each flow channel.

[0038] A second water inlet weir 13 is provided between the reflux zone 4 and the second-stage aeration zone 2 to adjust the flow rate of each flow channel in the second-stage aeration zone 2 .

[0039] An outlet weir 12 is provided between the second-stage aeration zone 2 and the subsequent reflux zone 4 to adjust the flow rate of each flow channel in the second-stage aeration zone 2 .

[0040] A second water inlet weir 13 is provided between the reflux zone 4 and the third-stage aeration zone 2 to adjust the flow rate of each flow channel in the third-stage aeration zone 2 .

[0041] A drainage weir 14 is provided between the third-stage aeration zone 2 and the drainage zone 5 to adjust the flow rate of each flow channel in the third-stage aeration zone 2 to ensure uniform flow rate in each flow channel.

[0042] Among them, in the aeration zone 2 of each level, the air gathering area 10 is formed between the pool bottom plate 17 and the first water inlet weir 11, the water outlet weir 12, and the pool wall of the aeration pool 1, and the air gathering area 10 is a bowl-shaped semi-enclosed area, which uses gravity to achieve air-water separation and collects the air after aeration in the previous level.

[0043] like Figure 7As shown, the aeration fan 15 arranged on the aeration tank 1 delivers the compressed air to the primary aeration device 7 through the delivery pipe 16, and enters the first-level aeration zone 2 through the aeration holes on the aeration pipe. The aerated bubbles float to the top of the first-level aeration zone 2, the air collection area 10, where the air and water are separated; the separated air passes through the opening 8 on the bottom plate 17 of the second-level aeration zone 2 and enters the secondary aeration device 9 inside the second-level aeration zone 2. After passing through the secondary aeration device 9, the air is once again divided into small bubbles and enters the second-level aeration zone 2.

[0044] The separated air in the upper part of the second-stage aeration zone 2 passes through the opening 8 on the bottom plate 17 of the third-stage aeration zone 2 and enters the secondary aeration device 9 inside the third-stage aeration zone 2. The air passes through the aeration device and is once again divided into small bubbles, which enter the third-stage aeration zone 2 and overflow on the water surface.

[0045] The aeration fan 15 adopts a high-efficiency high-pressure fan.

[0046] The delivery pipeline 16 is made of glass fiber reinforced plastic pipeline or corrosion-resistant metal pipeline.

[0047] like Figure 4 As shown, in the pool bottom plate 17, the separated air is collected and separated through the openings 8 and enters the corresponding main pipe of the aeration device, thereby entering the aeration device for further aeration.

[0048] The aeration process of the aeration device at the lower part of the aeration zone 2 of the third stage is the same as the aeration process of the aeration device at the aeration zone 2 of the second stage.

[0049] The height of each aeration zone 2 is generally between 2 and 6 meters.

[0050] Except for the top aeration zone 2, the depth of the air collection area 10 formed in the upper part of the aeration zone 2 is between 0.5 and 1.5 meters.

[0051] The diameter of the aeration holes of the aeration device is between 0.1-6 mm for the first-stage aeration device 7 and between 1-8 mm for the second-stage aeration device 9. The total area of ​​the aeration holes should be increased step by step.

[0052] The multi-stage high-efficiency seawater recovery system for seawater desulfurization sends compressed air into the first-stage aeration device 7 through the air supply component, and enters the aeration area 2 of the bottom layer through the aeration holes. Under the buoyancy of seawater, the aerated bubbles float to the top of the aeration area 2 of the bottom layer to the air collection area 10, where air and water are separated. The separated air passes through the openings on the pool bottom plate 17 above the aeration area 2 of the bottom layer and enters the second-stage aeration device 9 of the next level, where it is once again divided into small bubbles and enters the second-stage aeration area 2 until it overflows on the water surface. Since two or more layers of aeration areas 2 are folded and arranged in the vertical direction in the aeration pool 1, the aeration air is gathered and utilized in multiple stages, which can greatly improve the aeration efficiency of the air. Since the utilization efficiency of the air is improved, the required air volume is greatly reduced, and the total energy consumption of the aeration system can be greatly reduced, achieving an energy saving effect of 10-20%. The present invention adopts a plurality of return aeration zones 2 constructed in the form of a connection between the reflux zones 4, which can greatly reduce the floor area of ​​the aeration tank 1 and save precious land resources. A two-layer aeration scheme can save about 50% of the floor area, a three-layer aeration scheme can save about 65% of the floor area, and a four-layer aeration scheme can save more than about 70% of the floor area. From the perspective of actual construction economy, it is preferable not to exceed four layers.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A multi-stage high-efficiency seawater recovery system for seawater desulfurization, comprising an aeration tank (1), characterized in that: An aeration zone (2) is provided inside the aeration tank (1), and the aeration zone (2) is provided with a plurality of layers, a water inlet zone (3) is provided at one end of the aeration zone (2) at the bottom layer, a reflux zone (4) is provided at the connection point between two adjacent groups of aeration zones (2), and a drainage zone (5) is provided at one end of the aeration zone (2) at the top layer away from the reflux zone (4); A longitudinal partition wall (6) is provided in the aeration zone (2) along the water flow direction, and the longitudinal partition wall (6) divides the aeration zone (2) into a plurality of independent flow channels. A primary aeration device (7) is provided below the aeration zone (2) at the bottom layer, and the primary aeration device (7) is connected to an air supply component. Two adjacent groups of aeration zones (2) are separated by a pool bottom plate (17), and an opening (8) is provided on the pool bottom plate (17). A secondary aeration device (9) is provided in the aeration zone (2) above the opening (8), and an air gathering area (10) is formed in the aeration zone (2) below the pool bottom plate (17).

2. A multi-stage high-efficiency seawater recovery system for seawater desulfurization according to claim 1, characterized in that: A first water inlet weir (11) is provided between the water inlet area (3) and the aeration area (2) at the bottom layer, and the first water inlet weir (11) is used to evenly distribute the inlet water of the aeration area (2) at the bottom layer.

3. A multi-stage high-efficiency seawater recovery system for seawater desulfurization according to claim 2, characterized in that: A water outlet weir (12) is provided between the reflux zone (4) and the aeration zone (2) below, and the water outlet weir (12) is used to uniformly adjust the flow rate of drainage from each flow channel of the aeration zone (2) below.

4. A multi-stage high-efficiency seawater recovery system for seawater desulfurization according to claim 3, characterized in that: A second water inlet weir (13) is provided between the reflow zone (4) and the aeration zone (2) above, and the second water inlet weir (13) is used to uniformly adjust the flow rate of water entering each flow channel in the aeration zone (2) above.

5. A multi-stage high-efficiency seawater recovery system for seawater desulfurization according to claim 4, characterized in that: A drainage weir (14) is provided between the aeration area (2) and the drainage area (5) of the top layer, and the drainage weir (14) is used to adjust the flow rate of drainage in each flow channel in the aeration area (2) of the top layer.

6. A multi-stage high-efficiency seawater recovery system for seawater desulfurization according to claim 5, characterized in that: The air gathering area (10) is formed between the pool bottom plate (17) and the first water inlet weir (11), the water outlet weir (12), and the pool wall of the aeration pool (1), and the air gathering area (10) is a bowl-shaped semi-enclosed area.

7. The multi-stage high-efficiency seawater recovery system for seawater desulfurization according to claim 1 is characterized in that: The air supply assembly comprises an aeration fan (15) and a delivery pipeline (16); the aeration fan (15) is arranged outside the aeration tank (1), and the output end of the aeration fan (15) is connected to the delivery pipeline (16); the output end of the delivery pipeline (16) is connected to the primary aeration device (7).

8. The multi-stage high-efficiency seawater recovery system for seawater desulfurization according to claim 6 is characterized in that: The aeration fan (15) is a high-pressure fan, and the delivery pipeline (16) is a glass fiber reinforced plastic pipeline or a corrosion-resistant metal pipeline.

9. The multi-stage high-efficiency seawater recovery system for seawater desulfurization according to claim 1, characterized in that: The height of the aeration zone (2) is 2-6 m, and the depth of the air convergence area (10) is 0.5-1.5 m.

10. A multi-stage high-efficiency seawater recovery system for seawater desulfurization according to claim 9, characterized in that: The diameter of the aeration holes of the primary aeration device (7) is between 0.1 and 6 mm, and the diameter of the aeration holes of the secondary aeration device (9) is between 1 and 8 mm.

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