Seawater desulfurization aeration system

Abstract

The utility model belongs to the technical field of wet flue gas desulfurization, and particularly provides a seawater desulfurization aeration system which comprises a drainage channel and an aeration unit arranged in the drainage channel, the aeration unit comprises a seawater distribution tank, an aeration tank and a drainage tank which are communicated in sequence; the aeration tank is provided with a desulfurized seawater inlet; and the drainage tank is communicated with the drainage channel. According to the seawater desulfurization aeration system provided by the utility model, the aeration unit is excavated in the original seawater drainage channel, so that the field occupied by the aeration system is reduced while the drainage function of the original drainage channel is reserved. Besides, the number of the aeration units can be designed according to actual needs, aeration distinguishing units of different seawater desulfurization units are constructed, the aeration units are completely independent, mutual influence of aeration and drainage of aeration tanks of different units is avoided, the drainage function of an original drainage open channel is reserved, the occupied area is small, and the investment is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of wet flue gas desulfurization, and in particular relates to a seawater desulfurization aeration system. Background Art

[0002] Because rainwater brings alkaline substances (carbonates) from rock formations on land to the sea, natural seawater is usually alkaline, with a pH value generally greater than 7, which gives seawater a natural acid-base buffering capacity and the ability to absorb SO2. Seawater flue gas desulfurization is a desulfurization process that uses the natural alkalinity of seawater to absorb SO2 in flue gas. The flue gas is countercurrently contacted with seawater in the desulfurization tower to remove SO2 from the flue gas. The desulfurized seawater enters the aeration tank, where SO3 2 - Oxidize and release CO2, so that the seawater quality can be restored to meet the discharge standards.

[0003] Seawater desulfurization was first proposed by Professor Bromley LA of the University of California, Berkeley, in the 1960s, who also conducted research on the mechanism of seawater desulfurization technology. The first thermal power plant abroad to adopt seawater desulfurization technology was the Trombay Power Plant of Tata Power Company in India, which was designed by ABB of Norway in 1988 and had an overall desulfurization efficiency of more than 85%. The first domestic introduction of seawater desulfurization technology was the Shenzhen Mawan Power Plant, which introduced equipment and technology from ABB of Norway in 1998, with a desulfurization efficiency of 92% to 97%. Since then, seawater desulfurization technology has been put into operation in power plants such as Xiamen Songshan Power Plant and Huaneng Dalian Power Plant.

[0004] The seawater desulfurization process is simple, using natural seawater as a desulfurizer, without generating byproducts, and with low investment and operating costs, which has obvious advantages for desulfurization of coastal power plants and steel mills. However, the aeration tank of this process must be designed to consider both the full mixing of seawater and sufficient oxidation time, so the aeration tank occupies a large area, which limits the application of this process for existing and planned projects with a small desulfurization planning area and multiple power generation units in the park that need to be equipped with desulfurization equipment. Utility Model Content

[0005] The utility model aims to overcome the problems of large floor space, high construction cost and limited application of the existing multi-unit equipped seawater desulfurization device.

[0006] To this end, the utility model provides a seawater desulfurization aeration system, comprising a drainage channel and an aeration unit arranged in the drainage channel; the aeration unit comprises a seawater distribution tank, an aeration tank and a drainage tank connected in sequence; the aeration tank is provided with a desulfurized seawater inlet; the drainage tank is connected to the drainage channel.

[0007] Specifically, the seawater desulfurization aeration system further comprises a main water pipe for conveying fresh seawater; a first branch pipe and a second branch pipe are separated from one end of the main water pipe; the first branch pipe is connected to the seawater distribution tank; and the second branch pipe is connected to the drainage tank.

[0008] Specifically, water volume regulating baffles are provided in the first branch pipe and the second branch pipe.

[0009] Specifically, the seawater desulfurization aeration system further includes a water intake forepool; the water intake forepool is arranged in the drainage channel, and the water intake forepool is connected to the seawater distribution tank.

[0010] Specifically, the seawater desulfurization aeration system further comprises a lift pump room; a lift pump is arranged in the lift pump room; and a water inlet of the lift pump is connected to the water intake fore pool.

[0011] Specifically, the water intake fore pool and the seawater distribution pool are 2.5-4 m deeper than the aeration pool.

[0012] Specifically, the depth of the aeration tank is 2-4m.

[0013] Specifically, the seawater desulfurization aeration system comprises a plurality of aeration units; the plurality of aeration units are arranged in sequence along the length direction of the drainage channel.

[0014] Specifically, the drainage channel includes a connected open drainage channel and a bypass culvert; the plurality of aeration units are arranged in the open drainage channel; and the drainage tanks of the plurality of aeration units are respectively connected to the bypass culvert.

[0015] Specifically, the bypass culvert is provided with a drainage pipe for other drainage outside the aeration unit.

[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0017] The seawater desulfurization aeration system provided by the utility model reduces the space occupied by the aeration system while retaining the drainage function of the original drainage channel by excavating an aeration unit in the original seawater drainage channel. In addition, the number of aeration units can be designed according to actual needs. The condenser of the generator set is cooled by seawater. The drainage of the condensers of different units is introduced into different aeration units through pipelines. The seawater after desulfurization of each unit also flows into the corresponding aeration unit through pipelines. After aeration in the aeration tank, it is uniformly merged into the bypass culvert, and finally flows back to the downstream drainage open channel through the bypass culvert to complete the discharge up to standard. The aeration zones of different seawater desulfurization units are constructed in units, and each aeration unit is completely independent, which avoids the mutual influence of aeration and drainage of aeration tanks of different units, while retaining the drainage function of the original drainage open channel, occupying less space and with low investment.

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a seawater desulfurization aeration system provided by the utility model.

[0020] Figure 2 The utility model is a schematic diagram of the cross-sectional structure of an aeration unit of a seawater desulfurization aeration system.

[0021] Explanation of the reference numerals in the accompanying drawings: 1. open drainage channel; 2. bypass culvert; 3. aeration tank; 301. seawater inlet after desulfurization; 302. aeration weir; 4. drainage tank; 5. main water supply pipe; 501. first branch pipe; 502. second branch pipe; 503. water volume regulating baffle; 6. bypass weir; 7. seawater distribution tank; 8. front water intake tank; 9. lift pump room; 10. drainage pipe. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0025] Reference Figure 1-2The utility model provides a seawater desulfurization aeration system, including a drainage channel and an aeration unit arranged in the drainage channel; the aeration unit includes a seawater distribution tank 7, an aeration tank 3 and a drainage tank 4 connected in sequence; preferably, the seawater distribution tank 7 is arranged upstream of the aeration tank 3; the drainage tank 4 is arranged downstream of the aeration tank 3; the upstream of the aeration tank 3 is also provided with a desulfurized seawater inlet 301; the drainage tank 4 is connected to the drainage channel. In actual construction, the slope is leveled, the bottom is deepened and backfilled in the original seawater drainage channel to form the aeration tank 3, the seawater distribution tank 7 and the drainage tank 4 of the aeration unit. The aeration unit is preferably arranged upstream of the drainage channel to reduce the occupied space and investment costs. The condenser of the generator set used in the seawater desulfurization process adopts seawater cooling. The drainage generated by the condenser of the unit enters the aeration tank 3 through the seawater distribution tank 7, and the seawater after the unit desulfurization flows into the upstream of the aeration tank 3 through the desulfurized seawater inlet 301. Fresh seawater and desulfurized seawater are mixed in the aeration tank 3, and the pH is adjusted to about 5 to enhance the aeration effect of the desulfurized seawater in the aeration tank 3, and the SO3 2 - Oxidized to SO4 2 - Ions are removed and CO2 in the solution is blown out. After aeration, the seawater quality is restored and flows into the downstream drainage pool 4, and finally reaches the standard discharge through the drainage channel.

[0026] Furthermore, the seawater desulfurization aeration system also includes a water main pipe 5 for conveying fresh seawater; one end of the water main pipe 5 is connected to the condenser, and the other end is divided into a first branch pipe 501 and a second branch pipe 502; the first branch pipe 501 is connected to the seawater distribution tank 7; the second branch pipe 502 is connected to the drainage tank 4. The seawater coming out of the condenser is divided into two paths, one leading to the seawater distribution tank 7 upstream of the aeration unit, and the other leading to the drainage tank 4 downstream of the aeration unit. The fresh seawater entering the seawater distribution tank 7 flows into the aeration tank 3 and mixes with the desulfurized seawater flowing in through the desulfurized seawater inlet 301 to adjust its pH. The fresh seawater entering the drainage tank 4 is mixed with the aerated seawater to increase the pH of the aerated seawater and ensure the effluent water quality.

[0027] Preferably, water volume regulating baffles 503 are provided in both the first branch pipe 501 and the second branch pipe 502 to control the water inflow of the two routes, ensuring that the water volume entering the seawater distribution pool 7 and the drainage pool 4 meets their respective water needs.

[0028] Furthermore, the seawater desulfurization aeration system further includes a water intake foretank 8; the water intake foretank 8 is arranged in the drainage channel, and the water intake foretank 8 is connected to the seawater distribution tank 7. A part of the fresh seawater received in the seawater distribution tank 7 enters the aeration tank 3 to mix with the desulfurized seawater for aeration, and the other part flows into the water intake foretank 8 for the desulfurization process.

[0029] Specifically, the seawater desulfurization aeration system further includes a lift pump room 9; a lift pump is provided in the lift pump room 9; and the water inlet of the lift pump is connected to the water intake forebay 8. The lift pump room 9 is preferably arranged adjacent to the water intake forebay 8, and the fresh seawater in the water intake forebay 8 is transported to the subsequent desulfurization process through the lift pump.

[0030] Furthermore, the desulfurized seawater preferably stays in the aeration tank 3 for 3.5-5 minutes. The length and width of the aeration tank 3 are designed according to the size of the drainage channel, and the depth is preferably 2-4 meters, ensuring that the desulfurized seawater has a water depth of about 2-4 meters in the aeration tank 3.

[0031] Specifically, the water intake fore pool 8 is separated from the aeration pool 3 by the seawater distribution pool 7, and the water intake fore pool 8 and the seawater distribution pool 7 are 2.5-4 meters deeper than the aeration pool 3. On the one hand, it ensures that the seawater input from the water intake fore pool 8 to the subsequent desulfurization process is fresh seawater to ensure the desulfurization effect; on the other hand, it increases the turbulence degree when the fresh seawater and the desulfurized seawater are mixed, so that they are mixed evenly, thereby enhancing the aeration effect in the aeration pool 3.

[0032] In a detailed implementation, the seawater desulfurization aeration system includes a plurality of aeration units; the plurality of aeration units are arranged in sequence along the length direction of the drainage channel. The number of aeration units can be designed according to the number of generator sets in the desulfurization process. The condenser drainage of different units is introduced into different aeration units through pipelines. The seawater after desulfurization of each unit also flows into the corresponding aeration units through pipelines. The aeration zones of different seawater desulfurization units are constructed as units. Each aeration unit is completely independent, avoiding mutual influence during aeration and drainage of different units. In order to save space, the upper-level aeration unit is arranged adjacent to the lower-level aeration unit, but they are not connected to each other to avoid influence between the units.

[0033] Furthermore, the drainage channel includes a connected drainage open channel 1 and a bypass culvert 2; a plurality of aeration units are arranged in the drainage open channel 1; and the drainage pools 4 of the plurality of aeration units are respectively connected to the bypass culvert 2. The seawater aerated by each aeration unit is uniformly collected into the bypass culvert 2, and finally flows back to the downstream of the drainage open channel 1 through the bypass culvert 2 to complete the discharge up to standard. The aeration unit is preferably arranged upstream of the drainage open channel 1 to reduce the drainage volume of the bypass culvert 2, and reduce the occupied space and investment cost.

[0034] In some specific embodiments, a drain pipe 10 is provided on both the bypass culvert 2 and the drainage pool 4. Other drainage from the factory area in the aeration unit area is directly discharged into the drainage pool 4 or the bypass culvert 2 through the drain pipe 10, thereby avoiding the influence of other drainage on the aeration pool 3 and ensuring the aeration time and seawater recovery effect.

[0035] Embodiment 1:

[0036] like Figure 1As shown, this embodiment provides a seawater desulfurization aeration system suitable for three power generation units, including a drainage open channel 1 and a bypass dark channel 2 arranged side by side; the end of the bypass dark channel 2 is connected to the drainage open channel 1.

[0037] In the upstream section of the open drainage channel 1, three aeration units with the same structure are formed in sequence along the length direction through leveling of the slope, deepening of the bottom and backfilling.

[0038] The aeration unit is provided with a lift pump room 9, a water intake fore pool 8, a seawater distribution pool 7, an aeration pool 3 and a drainage pool 4 in sequence from upstream to downstream; the water intake fore pool 8, the seawater distribution pool 7, the aeration pool 3 and the drainage pool 4 are arranged adjacent to each other and the top space is connected; the upstream of the aeration pool 3 is provided with a desulfurized seawater inlet 301; the drainage pool 4 is connected with the bypass culvert 2; the tail of the aeration pool 3 is separated from the drainage pool 4 by an aeration weir 302; the aeration pool 3 is provided with a bypass on the side away from the bypass culvert 2, and a bypass weir 6 is provided in the bypass to divide the bypass into two parts, one part is connected with the seawater distribution pool 7, and the other part is connected with the drainage pool 4; the aeration weir 302 is 50-300mm higher than the bypass weir 6 to ensure that the water level in the aeration area is maintained at the designed water level and the aeration effect is ensured. Drain pipes 10 are provided on both the bypass culvert 2 and the drainage pool 4. The aeration unit further includes a water main pipe 5 , one end of which is divided into a first branch pipe 501 and a second branch pipe 502 ; the first branch pipe 501 is connected to the seawater distribution tank 7 ; the second branch pipe 502 is connected to the drainage tank 4 .

[0039] In actual use, the condensers of the three generator sets are respectively connected to the water delivery mains 5 of the three aeration units, and the desulfurized seawater of the units enters the corresponding aeration tank 3 through each desulfurized seawater inlet 301. The seawater from the condenser is divided into two paths after passing through the water delivery main 5, one leading to the seawater distribution tank 7, and the other leading to the drainage tank 4. Water volume regulating baffles 503 are arranged on the first branch pipe 501 and the second branch pipe 502 to control the water inflow of the two paths, to ensure that the water volume overflowing from the seawater distribution tank 7 into the water intake front tank 8 meets the desulfurization demand, and to allow part of the fresh seawater to enter the aeration tank 3 through the seawater distribution tank 7, to adjust the pH of the desulfurized seawater to about 5, and to enhance the aeration effect of the desulfurized seawater in the aeration tank 3. The aerated seawater flows into the downstream drainage tank 4 through the aeration weir 302, and is mixed with the fresh seawater flowing into the second branch pipe 502, to further increase the pH of the aerated seawater, and to ensure the effluent water quality. The aerated seawater in each drainage pool 4 is uniformly discharged into the bypass culvert 2, and finally flows back to the downstream of the drainage open channel 1 through the bypass culvert 2 to complete the discharge in compliance with the standards. Other drainage from the plant area within the aeration unit area is directly discharged into the bypass culvert 2 and the drainage pipe 10 of each aeration unit drainage pool 4.

[0040] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are identical or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A seawater desulfurization aeration system, Features: It comprises a drainage channel and an aeration unit arranged in the drainage channel; the aeration unit comprises a seawater distribution tank (7), an aeration tank (3) and a drainage tank (4) which are connected in sequence; the aeration tank (3) is provided with a desulfurized seawater inlet (301); the drainage tank (4) is connected to the drainage channel.

2. The seawater desulfurization aeration system according to claim 1, Features: It also comprises a main water pipe (5) for conveying fresh seawater; one end of the main water pipe (5) is divided into a first branch pipe (501) and a second branch pipe (502); the first branch pipe (501) is connected to the seawater distribution pool (7); and the second branch pipe (502) is connected to the drainage pool (4).

3. The seawater desulfurization aeration system according to claim 2, Features: The first branch pipe (501) and the second branch pipe (502) are both provided with water volume regulating baffles (503).

4. The seawater desulfurization aeration system according to claim 1, Features: It also comprises a water intake fore pool (8); the water intake fore pool (8) is arranged in the drainage channel, and the water intake fore pool (8) is connected to the seawater distribution pool (7).

5. The seawater desulfurization aeration system according to claim 4, Features: It also comprises a lift pump room (9); a lift pump is arranged in the lift pump room (9); and a water inlet of the lift pump is connected to the water intake fore pool (8).

6. The seawater desulfurization aeration system according to claim 4, Features: The water intake fore pool (8) and the seawater distribution pool (7) are 2.5-4 m deeper than the aeration pool (3).

7. The seawater desulfurization aeration system according to claim 1, Features: The depth of the aeration tank (3) is 2-4 m.

8. The seawater desulfurization aeration system according to claim 1, Features: It comprises a plurality of aeration units; the plurality of aeration units are arranged in sequence along the length direction of the drainage channel.

9. The seawater desulfurization aeration system according to claim 8, Features: The drainage channel comprises a connected open drainage channel (1) and a bypass dark channel (2); a plurality of aeration units are arranged in the open drainage channel (1); and the drainage pools (4) of the plurality of aeration units are respectively connected to the bypass dark channel (2).

10. The seawater desulfurization aeration system according to claim 9, Features: The bypass culvert (2) is provided with a drainage pipe (10) for receiving other drainage from the factory area.

Images