Desulfurization double-tower connecting flue cleaning structure

Abstract

This utility model discloses a cleaning structure for a desulfurization dual-tower connected flue, belonging to the field of flue cleaning technology. The flue cleaning structure includes a water source acquisition component, a flue, a main flushing pipe, a branch flushing structure, a nozzle assembly, and a control system. The main flushing pipe is fully welded to the flue sidewall via a gasket and fixed to the inner wall of the flue via three fixed pipe seats. The branch flushing structure includes a branch flushing water pipe installed on one side of the main flushing pipe. The nozzle assembly has multiple circular holes along its length on both the main flushing pipe and the branch flushing water pipe, with a nozzle installed at each hole. The nozzle's spray direction forms a 45° angle with the horizontal plane. The control system is electrically connected to an electric valve. This utility model achieves timed and quantitative flushing by precisely controlling the opening and closing of the electric valve through the control system. By adding a flushing water device at the pre-washing tower outlet, timed flushing is achieved within the internal support of the desulfurization pre-washing tower inlet flue, ensuring that calcium sulfate does not condense or accumulate on the wall surface during operation.

Description

Technical Field

[0001] This utility model relates to the field of flue gas cleaning technology, and more specifically, to a flue gas cleaning structure for a desulfurization double-tower connection. Background Technology

[0002] In industries such as power and steel, limestone-gypsum wet desulfurization technology is widely used due to its high efficiency in removing SO2, especially in dual-tower series desulfurization systems, where the connecting flue between the pre-washing tower and the absorption tower plays a crucial role in flue gas transmission. However, this type of flue has long faced serious scaling problems, becoming a core challenge restricting the safe and stable operation of the system. For example, overloaded gypsum accumulation in the connecting flue can cause it to collapse, posing a significant safety hazard and potentially leading to the collapse of lower structures. Flue subsidence can cause expansion joint tears, resulting in desulfurized flue gas leakage, environmental pollution, and significant environmental impact assessments. The gypsum accumulation in the connecting flue of the dual desulfurization towers requires regular, large-scale cleaning during annual maintenance. Existing flushing technologies have significant limitations: traditional high-pressure water flushing requires shutdown and consumes a large amount of water, easily causing fluctuations in the absorption tower's liquid level; acoustic cleaning has limited effectiveness against solidified gypsum scale. Therefore, we propose a cleaning structure for the connecting flue of the dual desulfurization towers. Utility Model Content

[0003] The purpose of this invention is to provide a cleaning structure for a desulfurization dual-tower connected flue, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A desulfurization dual-tower connected flue cleaning structure includes a water source acquisition component, which includes a process water header pipe located on the top of the pre-washing tower pump room, an electric valve located below the manhole door at the top of the pre-washing tower, and a water supply pipe connecting the process water header pipe and the electric valve. The water supply pipe is fixed by the reinforcement support of the maintenance platform on the upper part of the pre-washing tower.

[0006] The flue and main flushing pipe are arranged horizontally in the north-south direction along the flue platform at the inlet of the pre-washing tower. One end of the flue is connected to the electric valve, and the other end is closed. The main flushing pipe is fully welded to the side wall of the flue through a pad and is fixed to the inner wall of the flue through three fixed pipe seats.

[0007] The branch flushing structure includes a branch flushing water pipe installed on one side of the main flushing pipe. The branch flushing water pipe is connected to the main flushing pipe through the branch pipe. A pipe support structure is also installed between the branch flushing water pipe and the main flushing pipe.

[0008] The nozzle assembly, main flushing pipe and branch flushing water pipe are all provided with multiple round holes along the length direction, and a nozzle is installed at each round hole. The spray direction of the nozzle is at a 45° angle to the horizontal plane.

[0009] The control system is electrically connected to the electric valve and is used to control the opening and closing of the electric valve.

[0010] Preferably, the main flushing pipe has φ16 round holes every 300mm along its length, and the branch flushing water pipe has φ10 round holes every 300mm.

[0011] Preferably, the reinforcement support for the upper maintenance platform of the pre-washing tower is an I-beam support, and the water supply pipeline is fixed to the I-beam support by U-shaped pipe clamps.

[0012] Preferably, the nozzles of the main flushing pipe spray towards the inner arc section and bottom of the flue, achieving thorough flushing of the flue floor plate without any dead angles, while the flushing holes of the branch flushing water pipes face the top and sides of the flue support structure, used to flush away the scale buildup on the surface of the support structure.

[0013] Preferably, both the main flushing pipe and the branch flushing water pipe are made of duplex stainless steel.

[0014] Preferably, the electric valve is a fully open / fully closed electric butterfly valve.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] (1) This utility model adds a flushing water device to the outlet of the pre-washing tower to realize timed flushing of the flue gas duct at the inlet of the desulfurization pre-washing tower, including the internal support, to ensure that calcium sulfate will not condense or accumulate on the wall surface during operation, thus completely solving the problem of easy scale accumulation in the flue gas duct connecting the two towers and eliminating the safety hazard of heavy flue gas ducts from the source. After flushing, the flushing water flows into the absorption tower, which not only ensures that the flushing part does not accumulate scale or blockage, but also maintains the balance of the liquid level in the absorption tower, so that calcium sulfate is not easy to condense or accumulate during long-term operation.

[0017] (2) This utility model uses a control system to precisely control the opening and closing of electric valves to achieve timed and quantitative flushing (e.g., flushing for 10 minutes per hour), which ensures that the flushing frequency is sufficient to suppress crystal growth and prevents the supersaturated slurry from staying on the wall for more than the critical time, while also avoiding excessive rise in the liquid level of the absorption tower. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the flue of this utility model.

[0020] The following are the labels in the diagram: 1. Main flushing pipe; 101. Branch flushing water pipe; 102. Branch pipe; 2. Manhole; 3. Maintenance platform; 4. Water supply pipe; 5. Fixed pipe seat; 6. Pipe support structure; 7. Flue. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example:

[0023] Please see Figure 1-2 A desulfurization dual-tower connected flue cleaning structure includes a water source acquisition component for introducing water into the pre-washing tower. The water source acquisition component includes a process water header pipe located on the top of the pre-washing tower pump room, an electric valve located below the manhole door 2 at the top of the pre-washing tower, and a water supply pipe 4 connecting the process water header pipe and the electric valve. The water supply pipe 4 is fixed by the reinforcement support of the upper maintenance platform 3 of the pre-washing tower.

[0024] Specifically, the process water header (φ219) serves as the source of flushing water, directly connected to the existing process water network of the desulfurization system. It utilizes the stable pressure of the process water (0.4–0.6 MPa) to provide flushing power, avoiding the need for additional water pumps and reducing energy consumption and equipment costs. Electric valves are installed below the manhole at the top of the pre-washing tower, in a dry area outside the flue gas pre-washing tower outlet, preventing direct corrosion of the valves by gypsum slurry and ensuring their service life. The control system precisely controls the opening and closing of the electric valves, achieving timed and quantitative flushing (e.g., flushing for 10 minutes per hour). This ensures a sufficient flushing frequency to inhibit crystal growth and prevent supersaturated slurry from remaining on the wall for longer than the critical time, while also preventing excessive rise in the absorber level. The water supply pipeline is made of duplex stainless steel, such as S31803, to resist the Cl content in the desulfurization slurry. - Corrosion; The upper maintenance platform 3 of the pre-washing tower is reinforced with an I-beam support. The water supply pipeline is fixed to the I-beam support by U-shaped pipe clamps to offset the impact of water flow during rinsing and prevent pipeline vibration from causing weld cracking or interface leakage.

[0025] Flue 7 and main flushing pipe 1 are arranged horizontally in the north-south direction along the flue platform at the inlet of the pre-washing tower. One end of the pipe is connected to an electric valve, and the other end is closed. The main flushing pipe 1 is fully welded to the side wall of flue 7 through a pad and is fixed to the inner wall of flue 7 through three fixed pipe seats 5.

[0026] Specifically, the main flushing pipe 1 is horizontally arranged in a north-south direction at the inlet flue platform of the pre-washing tower. The axis of the main flushing pipe 1 is aligned with the center of curvature of the inner arc segment of the flue, ensuring that the nozzle spray range covers the full width of the flue bottom plate. The end of the main flushing pipe 1 is sealed with a blind flange welded to prevent the flushing water from forming eddies at the pipe end, which could lead to localized scale buildup. A gasket (8mm thick, made of the same material as the pipe) is fully welded to the side wall of the flue, forming a continuous sealing surface to prevent flushing water from seeping into the gap between the anti-corrosion layer and the steel substrate. Three fixed pipe supports are connected to the pre-embedded steel plate on the inner wall of the flue with bolts, controlling the pipe vibration amplitude to within 0.05mm to accommodate the micro-vibrations in the flue caused by the flue gas flow.

[0027] The branch flushing structure includes a branch flushing water pipe 101 installed on one side of the main flushing pipe 1. The branch flushing water pipe 101 is connected to the main flushing pipe 1 through a branch pipe 102. A pipe support structure 6 is also installed between the branch flushing water pipe 101 and the main flushing pipe 1.

[0028] Specifically, branch pipe 102 is vertically led out from the top of main flushing pipe 1, and the φ10 flushing hole on branch flushing water pipe 101 faces the top and side of the support beam, directly flushing the dead corner of scale accumulation at the connection between the flange and web of the support beam; the pipe support structure 6 fixes the connection between branch pipe 102 and main pipe, and bears the reaction force when the branch flushing water pipe 101 is flushed, so as to avoid fatigue cracks in main flushing pipe 1 due to vibration of branch pipe.

[0029] The nozzle assembly, the main flushing pipe 1 and the branch flushing water pipe 101 are all provided with multiple round holes along the length direction, and a nozzle is installed at each round hole. The spray direction of the nozzle is at a 45° angle to the horizontal plane. After repeated tests, the angle between the flushing water nozzle and the horizontal plane was adjusted to 25°, 30°, 45° and 60°. Finally, the angle between the nozzle and the horizontal plane was determined to be 45°. This angle has the best flushing effect and ensures that the flue bottom plate is fully covered by flushing without leaving any dead corners.

[0030] The control system is electrically connected to the electric valve. The control system is used to control the opening and closing of the electric valve so that the flushing frequency is 10 minutes every 1 hour. The electric valve is a fully open and fully closed electric butterfly valve.

[0031] The system is designed to rinse for 10 minutes every hour, matching the growth cycle of gypsum crystals under low load conditions. Laboratory data shows that the initial adhesion time of gypsum crystals to the wall is about 40 to 50 minutes, and rinsing is completed before crystal nuclei form. The system integrates the absorption tower liquid level sensor signal (accuracy ±10mm). When the liquid level exceeds the set threshold (such as normal liquid level +80mm), the rinsing interval is automatically extended to 1.5 hours to ensure that the liquid level fluctuation is always within a safe range (within ±100mm).

[0032] In one possible embodiment, the electric butterfly valve has a response time of <5s and works with a pressure sensor to monitor the process water pressure in real time. When the pressure is lower than 0.3MPa, an alarm is automatically issued to avoid incomplete flushing due to insufficient water pressure.

[0033] This application proposes a flushing water system at the outlet of the pre-washing tower. The flushing water flows into the absorption tower after rinsing, which not only prevents scaling and clogging in the flushing area, but also maintains the balance of the liquid level in the absorption tower, thus preventing calcium sulfate from condensing and accumulating during long-term operation.

[0034] In this application, the main flushing pipe 1 has φ16 round holes every 300mm along its length, and nozzles are installed in the round holes. The nozzles are at a 45° angle to the horizontal plane. This angle provides the best flushing effect and ensures that the flue bottom plate is fully covered by flushing without leaving any dead corners. The diameter of the main flushing pipe 1 is φ159. The branch flushing water pipe 101 has φ10 round holes every 300mm on its wall. At the same time, it flushes the flue support and eliminates the phenomenon of easy scale accumulation and caking inside the flue support during operation. The diameter of the branch flushing water pipe 101 is φ57.

[0035] The main pipe has a φ16 round hole matched with a high-flow nozzle (flow rate 50-80L / min) to flush large areas of scale on the flue bottom plate; the branch flushing water pipe 101 has a φ10 round hole matched with a low-flow nozzle (flow rate 20-30L / min) to achieve fine flushing of the supporting structure without increasing the total water consumption.

[0036] In this application, the nozzle of the main flushing pipe 1 sprays towards the inner arc section and bottom of the flue, so as to achieve a thorough flushing of the flue bottom plate without dead angles. The flushing holes of the branch flushing water pipe 101 face the top and side surfaces of the flue support structure and are used to flush the scale on the surface of the support structure.

[0037] In this application, both the main flushing pipe 1 and the branch flushing water pipe 101 are made of duplex stainless steel with a yield strength ≥450MPa.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A desulfurization dual-tower connected flue gas cleaning structure, characterized in that, include: The water source acquisition component includes a process water header pipe located on the top of the prewashing tower pump house, an electric valve located below the manhole door (2) at the top of the prewashing tower, and a water supply pipe (4) connected between the process water header pipe and the electric valve. The water supply pipe (4) is fixed by the reinforcement support of the upper maintenance platform (3) of the prewashing tower. The flue (7) and the main flushing pipe (1) are arranged horizontally in the north-south direction along the flue platform at the inlet of the pre-washing tower. One end of the pipe is connected to the electric valve, and the other end is closed. The main flushing pipe (1) is fully welded to the side wall of the flue (7) through a pad and fixed to the inner wall of the flue (7) through three fixed pipe seats (5). The branch flushing structure includes a branch flushing water pipe (101) provided on one side of the main flushing pipe (1). The branch flushing water pipe (101) is connected to the main flushing pipe (1) through a branch pipe (102). A pipe support structure (6) is also provided between the branch flushing water pipe (101) and the main flushing pipe (1). The nozzle assembly has multiple round holes along its length on both the main flushing pipe (1) and the branch flushing water pipe (101), and a nozzle is installed at each round hole. The spraying direction of the nozzle is at a 45° angle to the horizontal plane. A control system is electrically connected to the electric valve, and the control system is used to control the opening and closing of the electric valve.

2. The desulfurization dual-tower connected flue gas cleaning structure according to claim 1, characterized in that: The main flushing pipe (1) has φ16 round holes every 300mm along its length, and the branch flushing water pipe (101) has φ10 round holes every 300mm on its wall.

3. The desulfurization dual-tower connected flue gas cleaning structure according to claim 1, characterized in that: The upper maintenance platform (3) of the pre-washing tower is reinforced with an I-beam support, and the water supply pipeline is fixed to the I-beam support by a U-shaped pipe clamp.

4. The desulfurization dual-tower connected flue gas cleaning structure according to claim 1, characterized in that: The nozzle of the main flushing pipe (1) sprays towards the inner arc section and bottom of the flue, achieving a thorough flushing of the flue bottom plate without any dead angles. The flushing holes of the branch flushing water pipe (101) face the top and side surfaces of the flue support structure, and are used to flush away the scale buildup on the surface of the support structure.

5. The desulfurization dual-tower connected flue gas cleaning structure according to claim 1, characterized in that: The main flushing pipe (1) and the branch flushing water pipe (101) are both made of duplex stainless steel.

6. The desulfurization dual-tower connected flue gas cleaning structure according to claim 1, characterized in that: The electric valve is a fully open / fully closed electric butterfly valve.

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