A flue gas treatment desulfurization tower

Abstract

The utility model relates to a desulfurizer, concretely is a flue gas treatment desulfurizer. It can improve flue gas treatment efficiency and stability to guarantee long -term efficient flue gas purification effect. Including tower body, exhaust inlet, desulfurizer liquid inlet and exhaust outlet, be equipped with a screen cylinder unit in the tower body, the screen cylinder unit includes the center main pipe of vertical penetration, this center main pipe is linked together with desulfurizer liquid inlet, and multiple spray layers are arranged along the axial direction interval of center main pipe. Each spray layer includes the inner ring pipe line, the middle ring pipe line and the outer ring pipe line of coaxial cover in center main pipe from inside to outside, is equipped with the spray head on each ring pipe line, and each ring pipe line is linked together with center main pipe through the branch pipe, is provided with the inner ring isolation board, the middle ring isolation board and the outer ring isolation board between two adjacent spray layers. The below of each spray layer corresponds to set up a group of screen plate, and the group of screen plate includes the inner ring screen plate, the middle ring screen plate and the outer ring screen plate fixed on the inner ring isolation board, the middle ring isolation board and the outer ring isolation board respectively, is opened in each screen plate and is equipped with the screen hole.

Description

Technical Field

[0001] This utility model relates to a desulfurization tower, specifically a flue gas treatment desulfurization tower. Background Technology

[0002] In industrial production, especially in some energy, chemical and metallurgical enterprises, a large amount of flue gas containing sulfur dioxide, nitrogen oxides, dust and other harmful components is generated during the specific production process, which needs to be purified.

[0003] Existing flue gas treatment equipment generally uses sieve plate towers, which typically consist of a vertical tower body with multiple layers of sieve plates inside. During operation, the absorbent (such as alkali or water) enters from the top of the tower and flows down the plates one by one through downcomers, maintaining a certain liquid level on each sieve plate. The flue gas to be treated enters from the bottom of the tower and, under pressure, passes through the sieve openings on each sieve plate sequentially from bottom to top. As the gas passes through the sieve openings at a certain velocity, it disperses the liquid on the plate into numerous droplets, liquid films, and bubbles, thereby increasing the contact area between the gas and liquid phases. In this intense turbulent process, harmful substances in the flue gas (such as SO2) react chemically with the absorbent or are captured by the droplets (such as dust), thus achieving flue gas purification.

[0004] However, existing sieve plate towers also have some common problems in treating flue gas. For example, they cannot control the airflow stability during the flue gas ascent, resulting in a low flue gas passing through the sieve plates, thus affecting the treatment quality. Furthermore, the nozzles are located in localized areas, and due to space constraints, their number is limited, thus affecting the flue gas treatment effect. Simultaneously, at the emission end of the sieve plate tower, when the outlet flue gas exceeds standards, it is often discharged directly without treatment due to a lack of detection methods, making it impossible to continuously meet emission standards. In addition, the structure of existing sieve plate towers makes it difficult to effectively guide the flue gas radially, and the various sieve plates do not form an effective purification path, limiting further improvements in desulfurization efficiency. Summary of the Invention

[0005] The purpose of this utility model is to provide a flue gas treatment desulfurization tower with improved structure, aiming to improve flue gas treatment efficiency and stability, thereby ensuring long-term and efficient flue gas purification effect. To achieve the above objective, this utility model adopts the following technical solution. A flue gas treatment desulfurization tower includes a tower body, a waste gas inlet, a desulfurization liquid inlet, and a waste gas outlet. A screen cylinder unit is provided inside the tower body. The screen cylinder unit includes a vertically penetrating central main pipe, which is connected to the desulfurization liquid inlet. Multiple spray layers are arranged at intervals along the axial direction of the central main pipe. Each spray layer includes an inner ring pipe, a middle ring pipe, and an outer ring pipe coaxially sleeved on the central main pipe from the inside to the outside. Each ring pipe is equipped with a nozzle, and each ring pipe is connected to the central main pipe through a branch pipe. An inner ring isolation plate, a middle ring isolation plate, and an outer ring isolation plate are provided between two adjacent spray layers. Below each of the spray layers, a set of sieve plates is provided. The set of sieve plates includes an inner ring sieve plate, a middle ring sieve plate, and an outer ring sieve plate, which are respectively fixed to the inner ring isolation plate, the middle ring isolation plate, and the outer ring isolation plate; each of the sieve plates is provided with sieve holes.

[0006] During operation, flue gas enters the bottom of the tower through the exhaust gas inlet and flows from bottom to top through the outer ring channel, middle ring channel and inner ring channel in sequence. It also passes through the screen holes on the screen plate in each channel and comes into contact with the desulfurization liquid layer on the screen plate to complete the purification.

[0007] Furthermore, the exhaust gas inlet is located at the bottom of the tower body, the desulfurization liquid inlet is located at the top of the tower body, and the exhaust gas outlet is located at the top of the tower body; the inner ring isolation plate, the middle ring isolation plate, and the outer ring isolation plate are arranged in a radial direction from the inside to the outside.

[0008] Furthermore, the arrangement of the inner ring isolation plate, the middle ring isolation plate, and the outer ring isolation plate forms multiple independent inner ring channels, middle ring channels, and outer ring channels in a concentric annular column shape within the sieve cylinder unit.

[0009] Furthermore, the edge of the sieve plate is provided with an overflow weir. The overflow weir at the edge of the sieve plate ensures that a certain thickness of desulfurization liquid layer can be maintained on the sieve plate, providing a stable liquid film or droplet contact interface for flue gas when passing through the sieve holes.

[0010] Furthermore, along the axial direction of the channel at the same radial position, the vertical projections of two adjacent sieve plates are staggered. This staggered vertical projection of adjacent sieve plates forms a zigzag or stepped flue gas rising path. This design breaks the straight upward trend of the flue gas, increases the degree of turbulence and the travel length, and allows for more thorough contact between the flue gas and the liquid layer.

[0011] Furthermore, between two adjacent spray layers, the inner ring isolation plate is located between the upper and lower inner ring pipes, the outer ring isolation plate is located between the upper and lower outer ring pipes, and the middle ring isolation plate is located between the upper and lower middle ring pipes.

[0012] Furthermore, a flue gas detection sensor is installed at the exhaust gas outlet, and a circulation pipeline is installed outside the tower body. The circulation pipeline is used to return the flue gas that fails the detection by the flue gas detection sensor to the bottom of the tower body.

[0013] Furthermore, the circulation pipeline includes a circulation outlet located at the top of the tower body, a circulation inlet located at the bottom of the tower body, and a connecting pipeline connecting the circulation outlet and the circulation inlet, wherein an exhaust fan is also installed on the connecting pipeline.

[0014] Furthermore, a dehydration plate is installed at the top of the tower, below the exhaust gas outlet. This plate is used to remove liquid droplets entrained in the purified flue gas, ensuring that the flue gas meets emission standards.

[0015] Furthermore, the screen cylinder unit is fixed to the inner wall of the tower body by a support arm extending radially from the central main pipe.

[0016] Compared with the prior art, this utility model has the following advantages.

[0017] This invention utilizes an annular partition plate to divide the screen cylinder unit into inner, middle, and outer annular channels. The physical partition forces the flue gas to pass sequentially through each annular channel, ensuring uniform distribution of the flue gas across the tower cross-section and eliminating flow dead zones and short-circuit phenomena, thereby stabilizing and improving overall treatment efficiency. Furthermore, this radially divided channel structure, combined with the axially staggered screen plate, constructs a three-dimensional gas-liquid contact network. The flue gas is redistributed radially and repeatedly deflected axially, greatly enhancing turbulence and mass transfer processes, which is the core structural guarantee for achieving ultra-high desulfurization efficiency in this device. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The scope of protection of the present invention is not limited to the following description.

[0019] Figure 1 This is a front view of the flue gas treatment desulfurization tower in an example.

[0020] Figure 2 This is a three-dimensional view of the sieve cylinder unit in an embodiment.

[0021] Figure 3 This is a top view of the sieve cylinder unit in an embodiment.

[0022] Figure 4 This is a front view of the sieve cylinder unit in an embodiment.

[0023] Figure 5 for Figure 4 A sectional view of AA.

[0024] Figure 6 A three-dimensional view of the screen cylinder unit with the isolation plate removed in the embodiment.

[0025] Figure 7 Front view of the sieve plate in the embodiment.

[0026] In the diagram, 1. Base; 2. Exhaust gas inlet; 3. Drainage outlet; 4. Maintenance inlet; 5. Tower body; 6. Screen cylinder unit; 7. Support ring; 8. Dewatering plate; 9. Exhaust gas outlet; 10. Detection sensor; 11. Circulation outlet; 12. Connecting pipeline; 13. Circulation inlet; 14. Exhaust fan; 15. Desulfurization liquid inlet; 601. Central main pipe; 602. Support arm; 603. Support arm fixing ring; 604. Branch pipe; 605. Inner ring pipeline; 606. Middle ring pipeline; 607. Outer ring pipeline; 608. Isolation plate; 609. Nozzle; 610. Screen plate; 611. Screen hole; 612. Overflow weir; 16. Outer ring channel; 17. Middle ring channel; 18. Inner ring channel. Detailed Implementation

[0027] First, an embodiment is provided to illustrate the structure and specific principle of this utility model: Example: Figure 1-7 As shown, the flue gas treatment desulfurization tower structure mainly consists of components such as base 1, exhaust gas inlet 2, tower body 5, screen cylinder unit 6, desulfurization liquid inlet 15, exhaust gas outlet 9, flue gas detection sensor 10, circulation inlet 13, circulation outlet 11, and exhaust fan 14.

[0028] The specific structural design and functions are as follows: 1. The base 1 serves as the supporting foundation for the desulfurization tower, ensuring equipment stability. The tower body 5 is the main structure for flue gas treatment, and a screen unit 6 is installed inside the tower body for purifying waste gas. A drain outlet 3 is also provided on the bottom side wall or bottom end cap of the tower body 5 to drain accumulated liquid inside the tower during equipment shutdown, maintenance, or cleaning. An inspection entrance 4 (usually a manhole or handhole) is also provided on the side wall of the tower body 5 at a suitable operating height, providing access for personnel to enter the tower for installation, inspection, and maintenance.

[0029] 2. The exhaust gas inlet 2 is located at the bottom of the desulfurization tower and is used to receive flue gas containing harmful gases such as sulfur dioxide and nitrogen oxides from industrial production processes. The exhaust gas outlet 9 is the outlet for the treated and purified flue gas.

[0030] 3. The desulfurization liquid inlet 15 is located in the middle of the tower body and is used to introduce the desulfurization liquid (such as alkali solution or water) into the central main pipe 601. The desulfurization liquid enters each branch pipe 604 through the central main pipe 601 and flows from the branch pipe 604 to the inner ring pipe 605, the middle ring pipe 606, and the outer ring pipe 607. Each pipe is evenly equipped with nozzles 609 for spraying the desulfurization liquid onto the sieve plate 610 to form a liquid layer.

[0031] 4. The screen cylinder unit 6 is the core part of the desulfurization tower. It is mainly composed of components such as the central main pipe 601, support arm 602, support arm fixing ring 603, branch pipe 604, inner ring pipe 605, middle ring pipe 606, outer ring pipe 607, nozzle 609, screen plate 610, screen hole 611, and overflow weir 612.

[0032] 5. The central main pipe 601 is connected to the desulfurization liquid inlet 15 via a pipeline, and is responsible for guiding the desulfurization liquid into the tower body. The central main pipe 601 is radially provided with branch pipes 604, which are interconnected with the central main pipe 601. The desulfurization liquid is introduced into the inner ring pipeline 605, the middle ring pipeline 606 and the outer ring pipeline 607 through the branch pipes 604.

[0033] The screen cylinder unit 6 is fixed to the inner wall of the desulfurization tower body 5 by a support arm 602 extending radially from the central main pipe 601. To further enhance the connection strength and stability, a support arm fixing ring 603 is fitted onto the central main pipe 601, and the inner end of the support arm 602 is fixedly connected to the support arm fixing ring 603. Specifically, the inner end of the support arm 602 is fixedly connected to the support arm fixing ring 603, while its outer end is fixedly connected to the support ring 7. Through the support ring fixed to the tower body 5, the screen cylinder unit 6 is stably suspended and positioned inside the tower body 5.

[0034] 6. Inner ring pipe 605, middle ring pipe 606, and outer ring pipe 607: These three pipes are concentrically arranged inside the screen cylinder unit 6, located in the inner, middle, and outer layers of the screen cylinder, respectively. Each layer of pipe is evenly equipped with nozzles 609, which are arranged horizontally to spray desulfurization liquid onto the corresponding screen plate 610 below, ensuring that the desulfurization liquid can evenly cover the screen plate 610 and maintain a certain liquid level.

[0035] 7. The screen cylinder unit 6 is equipped with multiple annular isolation plates 608, dividing the screen cylinder into an inner ring channel, a middle ring channel, and an outer ring channel. The design of the isolation plates 608 ensures that the flue gas can rise evenly and stably along different channels when passing through the screen cylinder unit 6. Each isolation plate 608 is evenly distributed with screen plates 610, which are fixed in the middle position of the isolation plate 608, and each screen plate 610 has an overflow weir 612 at its edge to block liquid and maintain a certain liquid layer thickness. Screen holes 611 are evenly arranged on the screen plates 610. When the flue gas passes through the screen holes 611, it comes into full contact with the sprayed desulfurization liquid, thus completing the flue gas purification.

[0036] Flue gas purification process: The flue gas to be treated enters the bottom of the desulfurization tower through the exhaust gas inlet 2. Under pressure, the flue gas passes through the sieve holes 611 on each layer of sieve plates 610 sequentially from bottom to top along the outer ring channel, middle ring channel, and inner ring channel. During this process, the desulfurization liquid is sprayed onto the sieve plate 610 through the nozzle 609, forming a liquid layer and undergoing intense gas-liquid contact with the flue gas, increasing the contact area between the gas and liquid phases. Harmful substances in the flue gas (such as SO2) react chemically with the desulfurization liquid or are captured by the droplets (such as dust), thereby achieving flue gas purification.

[0037] Flue gas detection sensor 10 and secondary treatment: A flue gas detection sensor 10 is installed at the exhaust gas outlet 9 inside the desulfurization tower to detect the sulfur content in the flue gas in real time. If the sulfur content in the flue gas meets the emission standards, the purified flue gas is discharged through the exhaust gas outlet 9; if the sulfur content in the flue gas exceeds the standard, the flue gas will enter the circulation inlet 13, and the exhaust fan 14 will guide the flue gas from the circulation outlet 11 back to the bottom of the desulfurization tower for secondary treatment until the sulfur content meets the emission standards.

[0038] Dewatering plate 8 and exhaust gas emission: After the purified flue gas passes through the screen cylinder unit 6, it passes through the dewatering plate 8 and is finally discharged from the exhaust gas outlet 9.

[0039] The specific implementation workflow is as follows: The absorbent enters the central main pipe 601 from the desulfurization inlet 15, and then flows through the central main pipe 601 into the branch pipe 604, inner ring pipe 605, middle ring pipe 606, and outer ring pipe 607. The desulfurization liquid is sprayed from the nozzles 609 on the annular pipes onto each screen plate 610 corresponding to each nozzle 609, forming a liquid layer on the screen plate 610.

[0040] The flue gas to be treated enters the desulfurization tower from the exhaust gas inlet 2. When it passes through the sieve cylinder unit 6, the flue gas comes into contact with the desulfurization liquid. When it passes through the sieve holes 611 on the sieve plate 610, the liquid is dispersed into droplets, liquid films, and bubbles, increasing the contact area between the gas and liquid phases. Harmful substances in the flue gas (such as SO2) react with the absorbent liquid or are captured by the droplets, thereby achieving the purification of the flue gas.

[0041] The purified flue gas passes through dehydration plate 8 and is finally discharged from exhaust outlet 9. If the sulfur content in the flue gas does not meet the emission standards, it undergoes secondary treatment through a recycling system to ensure that the final emissions meet environmental protection requirements.

[0042] Depending on actual needs, the number and layers of 604 branch pipes can be appropriately increased or decreased to meet the flue gas treatment requirements under different operating conditions. Simultaneously, the type and concentration of the desulfurization solution can also be adjusted according to the sulfur content of the treated flue gas to improve the desulfurization effect.

[0043] In summary, during operation, the desulfurization liquid enters the central main pipe 601 through the desulfurization liquid inlet 15, and is distributed to the inner ring pipe 605, middle ring pipe 606, and outer ring pipe 607 of each spray layer through the branch pipes 604, and is finally sprayed downwards from the nozzles 609. The flue gas to be treated enters the bottom of the tower through the exhaust gas inlet 2, and under pressure, flows from bottom to top through multiple channels formed by the inner ring isolation plate, middle ring isolation plate, and outer ring isolation plate, and passes through the sieve holes 611 on each sieve plate 610. During this process, it comes into full contact with the desulfurization liquid layer formed on the sieve plate 610 to complete the purification; the purified flue gas is finally discharged through the exhaust gas outlet 9.

[0044] It is understood that the above detailed description of the present utility model is only for illustrating the present utility model and is not limited to the technical solutions described in the embodiments of the present utility model.

[0045] Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the usage needs are met, they are all within the protection scope of this utility model.

Claims

1. A flue gas desulfurization tower, comprising a tower body (5), a waste gas inlet (2), a desulfurization liquid inlet (15), and a waste gas outlet (9), characterized in that: The tower body (5) is provided with a screen cylinder unit (6), which includes a vertically penetrating central main pipe (601), which is connected to the desulfurization liquid inlet (15); and multiple spray layers are arranged at intervals along the axial direction of the central main pipe (601). Each spray layer includes an inner ring pipe (605), a middle ring pipe (606) and an outer ring pipe (607) coaxially mounted on the central main pipe (601) from the inside out. Each ring pipe is equipped with a nozzle (609), and each ring pipe is connected to the central main pipe (601) through a branch pipe (604). Between two adjacent spray layers, an inner ring isolation plate, a middle ring isolation plate and an outer ring isolation plate are provided; below each spray layer, a set of sieve plates (610) are provided, the set of sieve plates (610) includes an inner ring sieve plate, a middle ring sieve plate and an outer ring sieve plate respectively fixed to the inner ring isolation plate, the middle ring isolation plate and the outer ring isolation plate; each sieve plate (610) is provided with sieve holes (611).

2. The flue gas treatment desulfurization tower according to claim 1, characterized in that: The exhaust gas inlet (2) is located at the bottom of the tower body (5), the desulfurization liquid inlet (15) is located at the top of the tower body (5), and the exhaust gas outlet (9) is located at the top of the tower body (5); the inner ring isolation plate, the middle ring isolation plate and the outer ring isolation plate are arranged in the radial direction from the inside to the outside.

3. The flue gas treatment desulfurization tower according to claim 2, characterized in that: The arrangement of the inner ring isolation plate, the middle ring isolation plate and the outer ring isolation plate forms multiple independent inner ring channels, middle ring channels and outer ring channels in the sieve cylinder unit (6) in a concentric ring column shape.

4. The flue gas treatment desulfurization tower according to claim 1, characterized in that: An overflow weir (612) is provided at the edge of the sieve plate (610).

5. The flue gas treatment desulfurization tower according to claim 1 or 2, characterized in that: Along the channel axis at the same radial position, the projections of two adjacent sieve plates (610) in the vertical direction are staggered.

6. The flue gas treatment desulfurization tower according to claim 2, characterized in that: Between two adjacent spray layers, the inner ring isolation plate is located between the upper and lower inner ring pipes (605), the outer ring isolation plate is located between the upper and lower outer ring pipes (607), and the middle ring isolation plate is located between the upper and lower middle ring pipes (606).

7. The flue gas treatment desulfurization tower according to claim 1, characterized in that: A flue gas detection sensor (10) is provided at the exhaust gas outlet (9), and a circulation pipeline is provided outside the tower body (5). The circulation pipeline is used to return the flue gas that fails the detection by the flue gas detection sensor (10) to the bottom of the tower body (5).

8. The flue gas treatment desulfurization tower according to claim 7, characterized in that: The circulation pipeline includes a circulation outlet (11) located at the top of the tower body, a circulation inlet (13) located at the bottom of the tower body, and a connecting pipeline (12) connecting the circulation outlet (11) and the circulation inlet (13). An exhaust fan (14) is also provided on the connecting pipeline (12).

9. The flue gas treatment desulfurization tower according to claim 1, characterized in that: A dehydration plate (8) is provided at the top of the tower body (5) and below the exhaust gas outlet (9).

10. The flue gas treatment desulfurization tower according to claim 1, characterized in that: The screen cylinder unit (6) is fixed to the inner wall of the tower body (5) by a support arm (602) extending radially from the central main pipe (601).

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