Water collection and gas distribution disc for flue gas cooling of flue gas ultra-low emission desulfurization tower

Abstract

The utility model discloses a water collection and gas distribution disc for cooling flue gas of a flue gas ultra-low emission desulfurization tower, relates to the field of flue gas ultra-low emission, and is particularly suitable for a wet flue gas desulfurization system. The device comprises a catchment discharge pipe, a catchment collecting tank, a support beam, a catchment gas distribution module and a catchment ditch. The water collecting and gas distributing module comprises a bottom plate, a vertical flue gas pipeline, a vertical flue gas pipeline outlet and a rainproof eave. The vertical flue gas pipeline is a rectangular pipeline, and holes are formed in the opposite long side faces, close to the rainproof eaves, of the upper portion of the pipeline respectively, so that two vertical flue gas pipeline outlets are formed. The bottom plate is provided with rectangular holes. The water collection and gas distribution module forms a large bottom plate through mutual bonding or welding of the bottom plates, and a plurality of modules are spliced into a complete device. The flue gas cooling water lifting device can effectively improve the flue gas cooling water lifting effect, does not influence the water balance of the desulfurization tower, does not interfere the flue gas flow field in the flue gas desulfurization tower, and reduces the water consumption and the operation cost.

Description

Technical Field

[0001] This utility model relates to the field of ultra-low emissions of flue gas, and is particularly applicable to wet flue gas desulfurization systems. Background Technology

[0002] In recent years, with the improvement of national flue gas emission standards and the widespread promotion and implementation of wet desulfurization technology, various industries have imposed stricter requirements on the performance of wet flue gas desulfurization systems and on reducing process water consumption, especially in areas with relatively scarce water resources.

[0003] During the wet flue gas desulfurization process, a large amount of process water evaporates and enters the clean flue gas. If the water vapor in the clean flue gas from the wet desulfurization process is condensed and collected and added to the process water system, the amount of process water used can be reduced, thus saving water.

[0004] Current wet desulfurization systems typically collect process water from the clean flue gas using a flue gas spray cooling process. This involves spraying circulating cooling water onto the clean flue gas to condense and collect the water vapor. Numerous engineering cases demonstrate that cooling the clean flue gas with circulating cooling water to condense some of the evaporated process water is a crucial water-saving method.

[0005] However, the circulating cooling spray water cannot enter the original wet desulfurization system, and the condensed water cannot enter the original system either, otherwise it will disrupt the water balance of the desulfurization system. At the same time, the cooling spray water will interfere with the flue gas flow field inside the flue gas desulfurization tower during the spraying process, affecting the desulfurization efficiency. Utility Model Content

[0006] To address the shortcomings of the existing technology, the purpose of this invention is to provide a water collection and distribution plate for cooling flue gas in an ultra-low emission desulfurization tower. It effectively improves the water lifting effect during flue gas cooling, does not affect the water balance of the desulfurization tower, does not interfere with the flue gas flow field within the desulfurization tower, and reduces water consumption and operating costs.

[0007] To achieve the above-mentioned objectives, the technical solution of this utility model is implemented in the following manner:

[0008] A water collection and air distribution plate for cooling flue gas in a flue gas ultra-low emission desulfurization tower is placed between the desulfurization spray layer and the cooling spray layer in the wet desulfurization tower. It is usually arranged above the demister of the wet desulfurization tower. The water collection and air distribution plate is a multi-channel through-flow type multi-opening water collection structure.

[0009] The wet flue gas passes through the water collection and distribution plate into the spray condensation zone. After being cooled by circulating cooling water, the flue gas is discharged from the condensation zone. The water condensed from the wet flue gas mixes with the spray water and falls into the water collection and distribution plate, where it is collected and transported to the corresponding circulating buffer water tank for reuse. This ensures that the water is completely collected and discharged, maintaining a uniform flue gas flow field within the desulfurization tower.

[0010] A water collection and air distribution plate for cooling flue gas in an ultra-low emission desulfurization tower comprises: a water collection and discharge pipe, a water collection tank, a support beam, a water collection and air distribution module, and a water collection ditch. The water collection and air distribution module includes: a base plate, a vertical flue gas duct, a vertical flue gas duct outlet, and a rainproof eaves. The vertical flue gas duct is rectangular, with openings on opposite long sides near the rainproof eaves at the top, forming two vertical flue gas duct outlets.

[0011] The base plate has rectangular holes. Water collection and air distribution modules are bonded or welded together to form a large base plate; multiple modules are assembled into a complete device. Water collection and air distribution modules are typically made of wear-resistant and corrosion-resistant alloy plates or fiberglass.

[0012] A cooling water layer of a certain height is formed in the water collection tank. Once the water layer exceeds a certain height, it flows into the water collection tank and is discharged from the water collection outlet pipe.

[0013] The number of water collection and discharge pipes and water collection tanks is determined according to the tower diameter and spray water volume. Generally, 1-4 are selected, and they can be preferentially arranged in the 0°, 90°, 180° and 270° directions of the water collection and air distribution plate.

[0014] Due to the adoption of the above-described structure, this utility model has the following advantages and beneficial effects compared with the prior art:

[0015] 1) The flue gas passes through the water collection and distribution module and then through the water collection and distribution plate. After the flue gas in the upper part of the water collection and distribution plate is cooled, the condensate falls onto the water collection and distribution plate and is discharged into the collection tank through the guide channel, which can effectively separate the flue gas and the condensate.

[0016] 2) The water collection and air distribution plate can collect and discharge the spray water without leakage, ensuring the water balance of the desulfurization system.

[0017] 3) It has the effect of optimizing the uniformity of the flue gas flow field, thus having a good effect on the uniformity of flue gas flow field distribution.

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a plan view of the water collection and air distribution plate.

[0020] Figure 2 Elevation layout of the water collection and air distribution panel.

[0021] Figure 3 This is the front view of the water collection and air distribution module.

[0022] Figure 4 This is a side view of the elevation of the water collection and air distribution module.

[0023] In the diagram: 1-Water collection and discharge pipe, 2-Water collection tank, 3-Support beam, 4-Water collection and air distribution module, 5-Water collection ditch, 6-Base plate, 7-Vertical flue gas pipe, 8-Vertical flue gas pipe outlet, 9-Rainproof eaves. Detailed Implementation

[0024] See Figures 1 to 4 The water collection and air distribution plate for cooling flue gas in the ultra-low emission desulfurization tower of this utility model is arranged above the flue gas inlet of the desulfurization tower and below the lowest spray layer of the desulfurization system. The planar and vertical layout of the water collection and air distribution plate is as follows. Figure 1 , Figure 2 As shown, multiple support beams (3) are installed inside the absorption tower. Water collection and gas distribution modules (4) are installed above the support beams. Water collection tank (2) and water discharge pipe (1) are installed below the support beams (3). The gap between the two sets of water collection and gas distribution modules (4) forms a water collection ditch (5).

[0025] The flue gas first enters the vertical flue gas duct (7) through the opening at the bottom plate (6) of the water collection and gas distribution module (4). The flue gas rises and is discharged to the outlets (8) of the vertical flue gas ducts on both sides after encountering the rainproof eaves (9). During the discharge process, the flue gas comes into contact with the spray cooling water in the opposite direction, and the flue gas is cooled down. The water vapor in the flue gas condenses to form condensate. When the spray water and flue gas condensate fall in the absorption tower, they first fall to the rainproof eaves (9), and then flow along the rainproof eaves (9) to the water collection ditch (5). The water collection ditches (5) eventually converge into the water collection tank (2), and then are discharged from the absorption tower through the water collection discharge pipe (1).

Claims

1. A water collection and distribution plate for cooling flue gas in an ultra-low emission desulfurization tower, comprising: The system is composed of a water collection and discharge pipe (1), a water collection tank (2), a support beam (3), a water collection and air distribution module (4), and a water collection ditch (5). The water collection and air distribution module (4) includes a base plate (6), a vertical flue gas pipe (7), a vertical flue gas pipe outlet (8), and a rainproof eaves (9). The vertical flue gas pipe is a rectangular pipe, and holes are opened on the opposite long sides of the upper part of the pipe near the rainproof eaves (9) to form two vertical flue gas pipe outlets (8).

2. The water collection and gas distribution plate for cooling flue gas in an ultra-low emission desulfurization tower according to claim 1, characterized in that: The base plate (6) has a rectangular hole; its feature is that the water collection and air distribution module (4) is formed by bonding or welding the base plates (6) together to form a large base plate, and multiple modules are spliced ​​together to form a complete device.

3. A water collection and gas distribution plate for cooling flue gas in an ultra-low emission desulfurization tower according to claim 1, characterized in that: A desulfurization cooling water layer of a certain height is formed in the water collection tank (2). After the water layer exceeds a certain height, it flows into the water collection tank (2) and is discharged from the water collection outlet pipe (1).

4. A water collection and gas distribution plate for cooling flue gas in an ultra-low emission desulfurization tower according to claim 1, characterized in that: The number of water collection and discharge pipes (1) and water collection tanks (2) is determined according to the tower diameter and spray water volume. Generally, 1-4 are selected, and they can be arranged in the 0°, 90°, 180° and 270° directions of the water collection and air distribution plate, respectively.

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