A desulfurization absorption tower self-oxidation device

Abstract

The present invention discloses a self-oxidation device for a desulfurization absorption tower, comprising a desulfurizer collecting tank, a desulfurizer overflow tank, a gas-liquid mixing pipe, an air inlet pipe, a gas-liquid connecting pipe, a desulfurizer branch pipe, and a desulfurizer aeration pipe. The liquid level of the desulfurizer overflow tank is higher than the liquid level in the absorption tower, and the liquid will naturally flow from high potential energy to low potential energy. During this process, a negative pressure will be formed in the gas-liquid connecting pipe arranged on the gas-liquid mixing pipe, and the upper part of the gas-liquid connecting pipe is connected to the air inlet pipe, which is connected to the atmosphere, so air will naturally be sucked in. As the liquid continues to move downward, gas is also continuously sucked in. Air is continuously introduced into a position requiring aeration and oxidation through the gas-liquid connecting pipe, the gas-liquid mixing pipe, and the desulfurizer aeration pipe, thereby realizing self-oxidation of the desulfurizer in the absorption tower. The entire working process is carried out spontaneously, reducing energy consumption and operation and maintenance costs.

Description

Technical Field

[0001] The invention belongs to the field of flue gas desulfurization, and in particular relates to a limestone-gypsum wet desulfurization or seawater desulfurization absorption tower self-oxidation device. Background Art

[0002] Both limestone-gypsum wet desulfurization and seawater desulfurization involve a desulfurizer oxidation aeration system to oxidize sulfate. The oxidation aeration system for limestone-gypsum wet desulfurization is installed in the desulfurization absorption tower, using a dedicated oxidation blower to deliver air into the absorption tower to oxidize sulfites. Seawater desulfurization utilizes a dedicated seawater recovery system to oxidize sulfites.

[0003] Both of these desulfurization processes require specialized aeration systems to provide the required air volume, as well as dedicated space for the equipment. In some areas, separate housing for the fans is necessary to control noise and maintain thermal insulation, leading to high energy consumption and maintenance costs. Therefore, an oxidation device that can reduce these costs is urgently needed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a desulfurization absorption tower self-oxidation device with a simple structure and capable of reducing energy consumption and operation and maintenance costs.

[0005] The present invention provides a desulfurization absorption tower self-oxidation device, comprising a plurality of inclined desulfurizer collecting tanks installed in the absorption tower, a circle of desulfurizer overflow tanks installed on the inner wall of the absorption tower, a plurality of gas-liquid mixing pipes connected to the bottom of the desulfurizer overflow tank at the upper part, a plurality of air inlet pipes connected to the plurality of gas-liquid mixing pipes through air-liquid connecting pipes, and a plurality of desulfurizer aeration pipes. The desulfurizer collecting tank is arranged above the desulfurizer overflow tank, and the desulfurizer in the desulfurizer collecting tank can flow into the desulfurizer overflow tank. The desulfurizer overflow tank is located above the flue gas inlet of the absorption tower and below the spray layer of the absorption tower. There is a height difference between the overflow liquid level of the desulfurizer overflow tank and the liquid level in the absorption tower. The upper end of the air inlet pipe is open and the lower end is sealed. The upper air inlet of the air inlet pipe extends out of the absorption tower. The lower end of each gas-liquid mixing pipe is connected to the desulfurizer aeration pipe. The number of gas-liquid mixing pipes, air inlet pipes, and desulfurizer aeration pipes is equal.

[0006] The present invention provides a desulfurization absorption tower self-oxidation device, wherein each gas-liquid mixing tube is connected to the air inlet pipe through two gas-liquid connecting tubes, the upper ends of each two gas-liquid connecting tubes are connected to the bottom of the air inlet pipe, and the lower ends of each two gas-liquid connecting tubes are connected to the upper part of the gas-liquid mixing tube.

[0007] The present invention provides a self-oxidation device for a desulfurization absorption tower, wherein each gas-liquid connecting pipe includes a vertically arranged middle section which is integrally constructed or connected in sections, a head section connected to the upper end of the middle section, and a tail section connected to the lower end of the middle section, the connection between the head section and the air inlet pipe is higher than the connection between the head section and the middle section, and the connection between the tail section and the gas-liquid mixing pipe is lower than the connection between the tail section and the middle section.

[0008] The present invention provides a desulfurization absorption tower self-oxidation device, wherein a plurality of desulfurizer collecting tanks are installed on the inner wall of the absorption tower, and the plurality of desulfurizer collecting tanks are arranged from the inner wall of the absorption tower toward the center of the absorption tower and inclined upward, and holes are opened on the desulfurizer collecting tanks near their fixed ends, and the plurality of holes are located directly above the desulfurizer overflow tank.

[0009] The present invention provides a desulfurization absorption tower self-oxidation device, wherein a plurality of desulfurizer collecting tanks are installed on the overflow weir of the desulfurizer overflow tank, and the connection end between the desulfurizer collecting tank and the overflow weir is lower than the other end of the desulfurizer collecting tank.

[0010] The present invention provides a desulfurization absorption tower self-oxidation device, wherein the spray pipe of the absorption tower spray layer is connected to the desulfurizer upper tower pipeline.

[0011] The present invention provides a desulfurization absorption tower self-oxidation device, which further includes a desulfurizer branch pipe, one end of which is connected to the desulfurizer upper tower pipeline, and the other end of which is connected to the desulfurizer overflow tank.

[0012] The present invention provides a desulfurization absorption tower self-oxidation device, wherein the inner diameter of the desulfurizer branch pipe is smaller than the inner diameter of the spray pipe of the absorption tower spray layer.

[0013] The present invention provides a desulfurization absorption tower self-oxidation device, which further comprises a desulfurizer circulation pump, and the desulfurizer circulation pump transports the desulfurizer to the desulfurizer overflow tank through a pipeline.

[0014] Compared with the prior art, the advantages of the present invention are: the self-oxidation device of the desulfurization absorption tower of the present invention works on the siphon principle, including a desulfurizer collecting tank, a desulfurizer overflow tank, a gas-liquid mixing pipe, an air inlet pipe, a gas-liquid connecting pipe, a desulfurizer branch pipe, and a desulfurizer aeration pipe. When in use, it is installed in the absorption tower. Since the liquid level in the desulfurizer overflow tank is higher than the liquid level in the absorption tower, the liquid will naturally flow from high potential energy to low potential energy. In this process, negative pressure will be formed in the gas-liquid connecting pipe arranged on the gas-liquid mixing pipe, and the upper part of the gas-liquid connecting pipe is connected to the air inlet pipe, and the air inlet pipe is also connected to the gas-liquid connecting pipe. Connected to the atmosphere, air will be naturally sucked in, as the liquid continues to move downward, gas is also continuously sucked in, the movement of the liquid in the pipeline plays the role of a "piston", and air is continuously introduced into the position where aeration and oxidation are required through the gas-liquid connecting pipe, the gas-liquid mixing pipe, and the desulfurizer aeration pipe, thereby realizing aeration and oxidation. The entire working process proceeds spontaneously, with a simple structure, relatively small investment and easy implementation, and has no effect on the desulfurization of the absorption tower. The entire device has no moving parts. As long as the absorption tower is working, the process will proceed automatically, reducing energy consumption and reducing operation and maintenance costs.

[0015] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a half-section structure of a desulfurization absorption tower auto-oxidation device according to the present invention, showing the absorption tower;

[0017] Figure 2 This is a main cross-sectional view of a desulfurization absorption tower auto-oxidation device according to the present invention, showing the absorption tower;

[0018] Figure 3 This is a top view of a desulfurization absorption tower self-oxidation device of the present invention.

[0019] Among them, 1-desulfurizer collecting tank, 2-desulfurizer overflow tank, 3-gas-liquid mixing pipe, 4-air inlet pipe, 5-gas-liquid connecting pipe, 6-desulfurizer branch pipe, 7-absorption tower spray layer diagram, 8-desulfurizer upper tower pipeline, 9-desulfurizer aeration pipe, 10-flue gas inlet, 11-hole, 71-spray hole, 1'-absorption tower. DETAILED DESCRIPTION

[0020] like Figure 1-3As shown, the present invention is a desulfurization absorption tower self-oxidation device, comprising a plurality of inclined desulfurizer collecting tanks 1 installed in the absorption tower 1', a circle of desulfurizer overflow tanks 2 installed on the inner wall of the absorption tower 1', a plurality of gas-liquid mixing pipes 3 connected to the bottom of the desulfurizer overflow tank 2 at the upper part, a plurality of air inlet pipes 4 connected to the plurality of gas-liquid mixing pipes 3 through gas-liquid connecting pipes 5, and a plurality of desulfurizer aeration pipes 9. The desulfurizer collecting tank 1 is arranged above the desulfurizer overflow tank 2, and the desulfurizer in the desulfurizer collecting tank 1 is discharged. The desulfurizer can flow into the desulfurizer overflow trough 2, which is located above the absorber flue gas inlet 10 and below the absorber spray layer 7. There is a height difference between the overflow liquid level of the desulfurizer overflow trough 2 and the liquid level in the absorber 1'. The upper end of the air inlet pipe 4 is open and the lower end is sealed. The upper air inlet of the air inlet pipe 4 extends outside the absorber 1'. The lower end of each gas-liquid mixing pipe 3 is connected to the desulfurizer aeration pipe 9. The number of gas-liquid mixing pipes 3, air inlet pipes 4, and desulfurizer aeration pipes 9 is equal. The spray pipe of the absorber spray layer 7 is connected to the desulfurizer upper tower pipeline 8.

[0021] like Figure 1 、 2 As shown, each gas-liquid mixing tube 3 is connected to the air inlet pipe 4 via two gas-liquid connecting tubes 5. The upper ends of each of the two gas-liquid connecting tubes 5 are connected to the bottom of the air inlet pipe 4, and the lower ends of each of the two gas-liquid connecting tubes 5 are connected to the upper portion of the gas-liquid mixing tube 3. Each gas-liquid connecting tube 5 includes a vertically arranged middle section, which is integrally formed or connected in sections, a head section connected to the upper end of the middle section, and a tail section connected to the lower end of the middle section. The connection between the head section and the air inlet pipe is higher than the connection between the head section and the middle section, and the connection between the tail section and the gas-liquid mixing tube 3 is lower than the connection between the tail section and the middle section.

[0022] The cross section of the desulfurizing agent collecting tank 1 is semi-circular, and the desulfurizing agent collecting tank 1 adopts an arc-shaped groove. Figure 2 There is a semicircular groove in the middle. A plurality of desulfurizing agent collecting tanks 1 are installed on the inner wall of the absorption tower 1'. The plurality of desulfurizing agent collecting tanks 1 are arranged from the inner wall of the absorption tower to the center of the absorption tower and tilted upward (that is, the connection between the desulfurizing agent collecting tank 1 and the inner wall of the absorption tower is lower than the free end of the desulfurizing agent collecting tank 1, see Figure 2 , the root of the desulfurizer collecting tank 1 is lower than the end), and holes 11 are formed in the desulfurizer collecting tank 1 near its fixed end (the root of the desulfurizer collecting tank 1). Multiple holes 11 are located directly above the desulfurizer overflow tank 2. The desulfurizer flowing out of the spray holes 71 of the spray pipe of the desulfurizer spray layer 7 falls into the desulfurizer collecting tank 1 and flows into the desulfurizer overflow tank 2 through the holes 11 in the desulfurizer collecting tank 1.

[0023] The desulfurization absorption tower auto-oxidation device of the present invention further includes a desulfurizer branch pipe 6, one end of which is connected to a desulfurizer upper tower pipeline 8, and the other end of which is connected to a desulfurizer overflow tank 2 to ensure overflow of the desulfurizer in the desulfurizer overflow tank 2. The inner diameter of the desulfurizer branch pipe 6 is smaller than the inner diameter of the spray pipe of the absorption tower spray layer 7.

[0024] The desulfurization absorption tower auto-oxidation device of the present invention further includes a desulfurizer circulation pump, which transports desulfurizer to the desulfurizer overflow tank 2 via a pipeline. The desulfurizer circulation pump can independently supply desulfurizer to the desulfurizer overflow tank 2. Alternatively, the desulfurizer circulation pump can simultaneously supply desulfurizer to the absorption tower spray layer 7 and the desulfurizer overflow tank 2 via the desulfurizer upper tower pipeline 8 and the desulfurizer branch pipe 6.

[0025] In the present invention, multiple desulfurizer collecting tanks 1 can also be installed on the overflow weir of the desulfurizer overflow tank 2, with the connection end of the desulfurizer collecting tank 1 and the overflow weir lower than the other end of the desulfurizer collecting tank 1. The installation position and tilt direction of the desulfurizer collecting tank 1 can be any as long as it can ensure that the desulfurizer flows into the desulfurizer overflow tank 2.

[0026] In a desulfurization absorption tower auto-oxidation device of the present invention, a desulfurizer overflow trough 2 is installed on the absorption tower wall, located above the absorption tower flue gas inlet 10, and located at an appropriate height below the first layer of the desulfurizer spray layer 7 to ensure that the overflow liquid level of the desulfurizer overflow trough 2 has the maximum height difference with the liquid level in the absorption tower 1'.

[0027] In the present invention, the gas-liquid mixing pipe 3 is connected to the bottom of the desulfurizer overflow tank 2 to ensure that the desulfurizer in the desulfurizer overflow tank 2 can flow into the gas-liquid mixing pipe 3 by itself.

[0028] In the present invention, the upper end opening of the air inlet pipe 4 is the air inlet, which extends out of the absorption tower 1' and communicates with the atmosphere. The bottom of the air inlet pipe 4 is connected to the gas-liquid connecting pipe 5 to ensure that the air outside the tower can be smoothly inhaled.

[0029] The present invention provides a desulfurization absorption tower self-oxidation device, which is installed on the absorption tower 1' when in use. The working principle is the siphon principle. Since the liquid level of the desulfurizer overflow tank is higher than the liquid level in the absorption tower, the liquid will naturally flow from high potential energy to low potential energy. During this process, negative pressure will be formed in the gas-liquid connecting pipe arranged on the gas-liquid mixing pipe. Since the upper part of the gas-liquid connecting pipe is connected to the air inlet pipe, and the air inlet pipe is connected to the atmosphere, air will naturally be sucked in. As the liquid continues to move downward, gas is also continuously sucked in. The movement of the liquid in the pipeline plays the role of a "piston". Air is continuously introduced into the position where aeration and oxidation are required through the gas-liquid connecting pipe, the gas-liquid mixing pipe, and the desulfurizer aeration pipe, thereby realizing aeration and oxidation. The entire working process proceeds spontaneously and has no effect on the desulfurization of the absorption tower. The entire device has no moving parts. As long as the absorption tower is working, the process proceeds automatically.

[0030] The present invention provides a desulfurization absorption tower self-oxidation device, which can replace the desulfurizer oxidation system of the limestone-gypsum wet desulfurization absorption tower for the limestone-gypsum wet desulfurization process; for the seawater desulfurization system, arranging the present invention on the absorption tower can help reduce the energy consumption of the seawater recovery system.

[0031] For the limestone-gypsum wet desulfurization system, when the desulfurization system is started, the desulfurizer provides slurry to the absorption tower through the upper tower pipeline 8. Part of the slurry can be controlled by the valve through the desulfurizer branch pipe 6 to enter the desulfurizer overflow tank 2, so that the self-oxidation device establishes a siphon phenomenon. When the siphon is established, outdoor air will be naturally sucked in and then sent to the slurry pool at the bottom of the absorption tower to achieve aeration oxidation. At the same time, the desulfurizer collection tank 1 can also collect part of the slurry to ensure that the desulfurizer overflow tank 2 overflows. During implementation, the number of desulfurizer collection tanks 1 can be calculated as needed. When there are a sufficient number of desulfurizer collection tanks 1, the desulfurizer branch pipe 6 can be cut off to reduce the load on the desulfurizer circulation pump. When in use, the number of this device required can be selected according to actual working conditions, and a better oxidation effect can be achieved through reasonable layout. After the absorption tower is installed with this device, the oxidation air system can be eliminated, thereby saving the initial project equipment investment and the subsequent operation and maintenance costs. It also saves project space and avoids the noise problem caused by the fan.

[0032] For the seawater desulfurization process, this device can be set between the lower part of the absorption tower packing layer and the absorption tower flue gas inlet. By setting a reasonable number, pre-aeration of seawater in the lower tower of the absorption tower can be achieved, thereby saving energy consumption of the seawater recovery system.

[0033] The present invention provides a desulfurization absorption tower auto-oxidation device, which has the following characteristics:

[0034] 1. Replace the oxidation aeration system of the limestone-gypsum wet desulfurization system, thereby achieving energy saving in the desulfurization system and reducing investment costs and operation and maintenance expenses.

[0035] 2. It can save part of the energy consumption of the seawater recovery system, that is, it reduces energy consumption.

[0036] 3. The structure is simple, the construction or renovation work is small, there are no moving parts, and no special maintenance is required, which reduces the operation and maintenance costs.

[0037] 4. After the siphon is established, the system will run automatically without the need for special monitoring means and will not affect the desulfurization effect.

[0038] 5. In order to achieve better oxidation effect, multiple groups can be set up without worrying about system energy consumption.

[0039] The present invention provides a desulfurization absorption tower self-oxidation device, which utilizes the siphon principle and reasonably arranges the air inlet pipeline to achieve self-oxidation of the desulfurizer in the absorption tower. It can replace the deoxidation air system of the existing limestone-gypsum wet desulfurization process and reduce the energy consumption of the seawater recovery system of the seawater desulfurization process, making the desulfurization system more energy-efficient while saving equipment space and operation and maintenance costs.

[0040] Those skilled in the art should know that the protection scheme of the present invention is not limited to the above-mentioned embodiments, and various arrangements, combinations and transformations can be made on the basis of the above-mentioned embodiments. Without violating the spirit of the present invention, various transformations of the present invention fall within the protection scope of the present invention.

Claims

1. A desulfurization absorption tower self-oxidation device, comprising a plurality of inclined desulfurizer collecting tanks (1) installed in an absorption tower (1'), a circle of desulfurizer overflow tanks (2) installed on the inner wall of the absorption tower (1'), a plurality of gas-liquid mixing pipes (3) whose upper parts are connected to the bottom of the desulfurizer overflow tanks (2), a plurality of air inlet pipes (4) connected to the plurality of gas-liquid mixing pipes (3) through air-liquid connecting pipes (5), and a plurality of desulfurizer aeration pipes (9), wherein the desulfurizer collecting tank (1) is arranged above the desulfurizer overflow tank (2), the desulfurizer in the desulfurizer collecting tank (1) can flow into the desulfurizer overflow tank (2), the desulfurizer overflow tank (2) is located above the flue gas inlet (10) of the absorption tower and below the spray layer (7) of the absorption tower, the overflow liquid level of the desulfurizer overflow tank (2) and the liquid level in the absorption tower (1') have a height difference, and the upper end of the air inlet pipe (4) is open. The upper end and lower end of the air inlet pipe (4) are sealed, the upper air inlet of the air inlet pipe (4) extends out of the absorption tower (1'), the lower end of each gas-liquid mixing pipe (3) is connected to the desulfurizer aeration pipe (9), and the number of the gas-liquid mixing pipes (3), the air inlet pipe (4), and the desulfurizer aeration pipe (9) are equal; the spray pipe of the absorption tower spray layer (7) is connected to the desulfurizer upper tower pipeline (8); the desulfurization absorption tower self-oxidation device also includes a desulfurizer branch pipe (6), one end of the desulfurizer branch pipe (6) is connected to the desulfurizer upper tower pipeline (8), and the other end of the desulfurizer branch pipe (6) is connected to the desulfurizer overflow tank (2); the inner diameter of the desulfurizer branch pipe (6) is smaller than the inner diameter of the spray pipe of the absorption tower spray layer (7); the desulfurization absorption tower self-oxidation device also includes a desulfurizer circulation pump, and the desulfurizer circulation pump transports the desulfurizer to the desulfurizer overflow tank (2) through the pipeline.

2. A desulfurization absorption tower auto-oxidation device according to claim 1, characterized in that: Each gas-liquid mixing tube (3) is connected to the air inlet tube (4) via two gas-liquid connecting tubes (5), the upper ends of each of the two gas-liquid connecting tubes (5) are connected to the bottom of the air inlet tube (4), and the lower ends of each of the two gas-liquid connecting tubes (5) are connected to the upper part of the gas-liquid mixing tube (3).

3. A desulfurization absorption tower auto-oxidation device according to claim 2, characterized in that: Each gas-liquid connecting pipe (5) comprises a vertically arranged middle section which is integrally formed or connected in sections, a head section connected to the upper end of the middle section, and a tail section connected to the lower end of the middle section, wherein the connection between the head section and the air inlet pipe is higher than the connection between the head section and the middle section, and the connection between the tail section and the gas-liquid mixing pipe (3) is lower than the connection between the tail section and the middle section.

4. A desulfurization absorption tower auto-oxidation device according to claim 3, characterized in that: A plurality of the desulfurizing agent collecting tanks (1) are installed on the inner wall of the absorption tower (1'). The plurality of the desulfurizing agent collecting tanks (1) are arranged from the inner wall of the absorption tower toward the center of the absorption tower and tilted upward. A hole (11) is opened on the desulfurizing agent collecting tank (1) near its fixed end. The plurality of holes (11) are all located directly above the desulfurizing agent overflow tank (2).

5. The desulfurization absorption tower auto-oxidation device according to claim 3, characterized in that: A plurality of the desulfurizing agent collecting tanks (1) are installed on the overflow weir of the desulfurizing agent overflow tank (2), and the connection end between the desulfurizing agent collecting tank (1) and the overflow weir is lower than the other end of the desulfurizing agent collecting tank (1).

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