Slurry oxidation aeration device

Abstract

The utility model discloses a kind of slurry oxidation aeration devices, which is placed in the desulfurization absorption tower slurry pool inside in wet desulfurization process;It includes: interface, flow guiding cone, gas cover and bubble cutter;The small end of flow guiding cone is connected with oxidation air aeration branch pipe through interface;Flow guiding cone includes central cone and multiple flow guiding vanes arranged on central cone;Flow guiding cone cover is equipped with gas cover, adjacent flow guiding vane, central cone and gas cover form airflow channel, the air inlet direction of all airflow channels is coaxially arranged with the vertical axis of central cone, and the air outlet direction of all airflow channels is horizontal clockwise or counterclockwise air outlet;The lower surface of gas cover is arranged with arrayed bubble cutter.The utility model disperses large strand oxidation air flow into small bubbles by cyclone bubble cutting, strengthens gas-liquid mass transfer, in addition, through combination arrangement, it ensures that oxidation air is evenly distributed on the entire absorption tower cross section, and improves the oxidation efficiency of desulfurization slurry.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas treatment equipment, specifically to a slurry oxidation aeration device. Background Technology

[0002] In wet flue gas desulfurization (FGD) processes, the slurry oxidation system is one of the core units, and its performance directly affects desulfurization efficiency and operating costs. Currently, the mainstream technologies mainly employ two solutions: an oxidation pipeline system and an oxygen lance coupled with agitation devices.

[0003] When using an oxidation pipeline system, oxidation air enters the slurry tank as medium to large bubbles through small holes (13-15 mm in diameter) on the pipeline, resulting in relatively uniform overall aeration. However, due to significant turbulence within the slurry tank and vibrations in the pipeline caused by aeration, main pipe breaks frequently occur, greatly affecting aeration uniformity. Simultaneously, the aeration holes in the oxidation pipeline are prone to clogging due to scaling, increasing local resistance, which in turn increases energy consumption and affects oxygen transfer efficiency.

[0004] When using an oxygen lance with agitation, the oxidizing air is sprayed in large jets through a relatively large oxidizing lance tube towards the agitator blades. The agitator blades then break the oxidizing air into bubbles. This aeration method mainly produces large bubbles. Compared with an oxidation pipeline system, this aeration method is less prone to clogging. However, the aeration location is mainly near the tower wall. Although the agitator can push some bubbles a certain distance with the liquid flow, the overall uniformity of bubble distribution is relatively poor.

[0005] In summary, while traditional oxidation pipe network aeration systems offer uniform air distribution, they are less reliable. In contrast, traditional oxygen gun and stirring aeration systems offer higher reliability but suffer from uneven air distribution. Utility Model Content

[0006] In view of all or part of the problems existing in the prior art, this utility model provides a slurry oxidation aeration device with simple structure, good bubble dispersion effect and no clogging. The device breaks the large flow of oxidizing air into small bubbles by swirling bubble cutting, which enhances gas-liquid mass transfer. In addition, through combination and arrangement, it ensures that the oxidizing air is evenly distributed across the entire cross section of the absorption tower, thereby improving the oxidation efficiency of the desulfurization slurry.

[0007] This utility model discloses a slurry oxidation aeration device, which is placed inside the slurry tank of the desulfurization absorption tower in a wet desulfurization process; characterized in that the slurry oxidation aeration device includes: an interface, a flow guide cone, an air hood, and a bubble cutter.

[0008] The small end of the guide cone is connected to the oxidation air aeration branch pipe through the interface;

[0009] The guide cone includes a central cone and multiple guide vanes disposed on the central cone. The guide vanes deflect clockwise or counterclockwise around the central cone. The guide cone is covered by an air hood. An airflow channel is formed between adjacent guide vanes, the central cone and the air hood. The air inlet direction of all the airflow channels is coaxial with the vertical axis of the central cone, and the air outlet direction of all the airflow channels is horizontal clockwise or counterclockwise.

[0010] The lower surface of the air hood is provided with an array of bubble cutters, which are used to cut large bubbles from the airflow channel into smaller bubbles.

[0011] As a further improvement of this utility model, the slurry oxidation aeration device is arranged in at least one layer inside the slurry pool of the desulfurization absorption tower, and multiple devices are arranged in each layer. The oxidation air aeration branch pipe is connected to the oxidation air aeration main pipe, and the oxidation air aeration main pipe is externally connected to the oxidation fan.

[0012] As a further improvement of this utility model, the interface is a flange interface, the flange interface is DN50 or DN80 in size, and the length of the short section connected to the flange is 100-200mm.

[0013] As a further improvement of this utility model, the small end diameter of the guide cone is 50 or 80 mm, the large end diameter is 150-200 mm, and the height is 100-150 mm.

[0014] As a further improvement of this utility model, the number of guide vanes is 3 to 8, the outer edge of the guide vanes is tightly connected to the air cover, and the thickness of the guide vanes is 3 mm and the width is 20 to 25 mm.

[0015] As a further improvement of this utility model, at the starting end of the air intake, the end of the guide vane is aligned with the airflow direction. The airflow is divided by N guide vanes and enters (N-1) airflow channels, causing the oxidizing air to flow out of the guide vane tangentially.

[0016] As a further improvement of this utility model, the air hood is a two-section cone with a wall thickness of 3-5mm, including a first air hood cone and a second air hood cone; the taper of the first air hood cone is consistent with that of the guide cone and is tightly connected to the guide vanes provided on the guide cone; the inner diameter of the small end of the first air hood cone is 50 or 80mm, and the height of the first air hood cone is 10-20mm smaller than that of the guide cone, so that the guide cone extends from the bottom of the first air hood cone and is placed inside the second air hood cone.

[0017] As a further improvement of this utility model, the small end diameter of the second air hood cone is 140-180mm, the large end diameter is 400-600mm, and the height is 50-60mm.

[0018] As a further improvement of this utility model, bubble cutters are evenly arrayed below the second air hood cone.

[0019] As a further improvement of this utility model, the bubble cutter is a cylindrical, triangular prism or other shaped column with a length of 50-110mm. The upper end of the bubble cutter is connected to the lower part of the second air hood cone, and the lower ends of each bubble cutter are kept flush.

[0020] The method of using the slurry oxidation aeration device of this utility model is as follows:

[0021] The oxidation air supplied by the oxidation blower is distributed to various oxidation air branch pipes after passing through the main oxidation air duct. All oxidation air branch pipes are located below the main oxidation air duct and are arranged vertically downwards. The slurry oxidation aeration device of this invention is installed at the end of each oxidation air branch pipe, and this device is also arranged downwards. Oxidizing air is evenly distributed into its respective flow channels by the guide vanes at the inlet of the device. Following the curvature of the guide vanes, the airflow direction changes from flowing downwards along the branch pipe to flowing out of the guide vanes in a near-horizontal tangential direction. After flowing out of the guide vanes, the airflow comes into direct contact with the desulfurization slurry. Under the action of water pressure, the airflow is supported by the desulfurization slurry below the gas hood. The tangentially flowing airflow mixes with the desulfurization slurry to form a liquid-encapsulated gas state with large bubbles. Then, under the action of the bubble cutter below the gas hood, the large bubbles are gradually broken into small bubbles and flow out of the aeration device from the edge of the gas hood. The horizontal inertial effect caused by the airflow carrying the slurry will cause the bubbles to expand outwards, so that the distribution range is much larger than the diameter of the device. The slurry oxidation aeration device developed in this invention is a combination of multiple units arranged in the absorption tower. Although the number of bubbles that can be distributed in the central area of ​​a single unit is very small, this range will be compensated by the adjacent units, ultimately achieving uniform distribution of oxidizing air across the entire cross-section of the desulfurization tower slurry pool.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] Firstly, from the perspective of aeration uniformity, this invention utilizes a unique swirling bubble cutting principle to break down oxidizing air into numerous small bubbles. This results in a more uniform bubble distribution within the desulfurization slurry tank compared to traditional oxygen lance coupled stirring devices. The small bubbles, during their ascent, can more fully contact the slurry, significantly improving the mixing effect between the oxidizing air and the desulfurization slurry. This, in turn, comprehensively enhances the uniformity of the oxidation reaction throughout the entire tank, preventing localized insufficient or excessive oxidation. This ensures the desulfurization reaction proceeds stably and efficiently, effectively guaranteeing an improvement in desulfurization efficiency.

[0024] Secondly, regarding the issue of clogging, this invention eliminates the small-hole aeration method in oxidation pipeline systems, which is prone to scaling and clogging. Because there are no small holes, the risk of clogging due to scaling is fundamentally eliminated. This not only reduces equipment maintenance costs caused by clogging, including manpower, material resources, and economic losses from equipment downtime for repairs, but also ensures long-term stable operation of the device without frequent cleaning or replacement of parts due to clogging, effectively improving the operational reliability and continuity of the entire wet flue gas desulfurization system.

[0025] Furthermore, in terms of energy consumption, on the one hand, it avoids the increase in local resistance caused by blockage of aeration holes in the oxidation pipeline, thereby reducing the additional energy consumption required to maintain aeration. On the other hand, uniform aeration and efficient gas-liquid mass transfer make the oxidation reaction more complete. Under the condition of achieving the same desulfurization effect, it can reduce the overall consumption of oxidation air, further reducing energy consumption and saving enterprises a lot of operating costs.

[0026] Furthermore, from the perspective of equipment lifespan, this invention avoids the problem of main pipe breakage caused by slurry tank disturbance and aeration vibration, as seen in oxidation pipe network systems. The overall structure of the device is robust, reducing the frequency of replacement due to component damage, extending the equipment's service life, lowering equipment upgrade costs, and improving the efficiency of enterprise asset utilization.

[0027] Finally, from an environmental perspective, this invention enhances gas-liquid mass transfer, improves oxidation efficiency, and can more effectively remove sulfur from flue gas, reducing emissions of pollutants such as sulfur dioxide. This helps meet increasingly stringent environmental standards and makes a positive contribution to environmental protection. Attached Figure Description

[0028] Figure 1 This is a perspective view of the slurry oxidation aeration device of this utility model;

[0029] Figure 2 for Figure 1 The front view;

[0030] Figure 3 for Figure 1 Schematic diagram of the diversion vertebra;

[0031] Figure 4 This describes the bubble cutting process of the slurry oxidation aeration device of this utility model.

[0032] Figure 5 This is an example installation diagram of the slurry oxidation aeration device according to an embodiment of the present invention.

[0033] In the picture:

[0034] 1. Flange interface; 2. Guide cone; 2-1. Central cone; 2-2. Guide vane; 3. Air hood; 3-1. First air hood cone; 3-2. Second air hood cone; 4. Bubble cutter. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] The present invention will now be described in further detail with reference to the accompanying drawings:

[0037] like Figure 1 , 2 As shown, this utility model provides a slurry oxidation aeration device, which is mainly used inside the slurry tank of the desulfurization absorption tower in a wet desulfurization process. It enhances gas-liquid mass transfer and increases oxidation efficiency. Figure 5 As shown, the slurry oxidation aeration device is arranged in two layers inside the slurry tank of the desulfurization absorption tower, with multiple devices in each layer. Oxidation air aeration branch pipes are connected to the oxidation air aeration main pipe, which is externally connected to an oxidation blower. The slurry oxidation aeration device includes a flange interface 1, a guide cone 2, an air hood 3, and a bubble cutter 4. The flange interface 1 is used to connect the slurry oxidation aeration device to the oxidation air branch pipes inside the absorption tower. The flange interface is preferably DN50 or DN80, and the length of the short section connected to the flange is 100–200 mm. The small end of the guide cone 2 is connected to the flange interface 1. The small end diameter of the guide cone 2 is 50 mm or 80 mm, the large end diameter is 150–200 mm, and the height of the guide cone 2 is 100–150 mm.

[0038] like Figure 3As shown, the guide cone 2 includes a central cone 2-1 and multiple guide vanes 2-2 disposed on the central cone 2-1. The guide cone 2 is covered by an air shroud 3, meaning the inner side of the guide vanes 2-2 is connected to the central cone 2-1, and the outer side is connected to the bottom of the air shroud 3. The air shroud 3 is used to confine the oxidizing air ejected from the guide cone to the bubble dispersion area. Airflow channels are formed between adjacent guide vanes 2-2, the central cone 2-1, and the air shroud 3. The air inlet direction of all airflow channels is coaxial with the vertical axis of the central cone 2-1, and the air outlet direction of all airflow channels is horizontal clockwise or counterclockwise. Furthermore, the number of guide vanes 2-2 is 3 to 8, the outer edge of each guide vane 2-2 is tightly connected to the air shroud 3, and the thickness of each guide vane 2-2 is 3 mm, and its width is 20 to 25 mm. At the starting end of the air intake (the small end of guide cone 2), the tips of the guide vanes are aligned with the airflow direction. After the airflow is divided into (N-1) segments by N guide vanes, the guide vanes deflect clockwise or counterclockwise around the central cone of guide cone 2, causing the oxidizing air to flow tangentially out of guide cone 2. Figure 4 As shown.

[0039] like Figure 1 , 2 As shown, the air hood 3 of this invention consists of two conical sections with a wall thickness of 3-5 mm, including a first air hood conical section 3-1 and a second air hood conical section 3-2. The taper of the first air hood conical section 3-1 is consistent with that of the guide conical section 2 and is tightly connected to the guide vanes 2-2 provided on the guide conical section 2. The inner diameter of the small end of the first air hood conical section 3-1 is 50 or 80 mm, and the height of the first air hood conical section 3-1 is 10-20 mm smaller than that of the guide conical section 2, so that the guide conical section extends from the bottom of the first air hood conical section and is placed inside the second air hood conical section 3-2. An array of bubble cutters 4 is arranged on the lower surface of the air hood 3. The bubble cutters are used to cut large bubbles from the airflow channel into smaller bubbles. This arrangement allows the ends of the guide vanes of the guide conical section 2 to extend from the bottom of the first conical section of the air hood, which facilitates smoother airflow into the bubble cutters after being guided by the vanes on the guide conical section 2. The bubble cutter 4 can be cylindrical, triangular prism, or other shaped prisms, with a length of 50-110mm. The upper end of the bubble cutter is connected to the bottom of the air hood, and the lower ends of each bubble cutter are kept flush.

[0040] According to the slurry oxidation aeration device of this utility model embodiment, during operation, the oxidation air provided by the oxidation blower is distributed to each oxidation air branch pipe after passing through the oxidation air main pipe. The oxidation air branch pipes are all arranged below the oxidation air main pipe and vertically downwards. The ends of the oxidation air branch pipes are connected to the slurry oxidation aeration device of this utility model via flange bolts, and the device is also arranged downwards. The interface size adopts a large diameter of DN50 to DN80, eliminating the small-hole aeration method that is prone to scaling and clogging in oxidation pipe network systems. Because there is no small-hole structure, the risk of aeration holes being clogged due to scaling is fundamentally eliminated. This not only reduces equipment maintenance costs caused by clogging, including manpower, material resources, and economic losses due to equipment downtime for maintenance, but also ensures long-term stable operation of the device without frequent cleaning or replacement of parts due to clogging problems, effectively improving the operational reliability and continuity of the entire wet flue gas desulfurization system.

[0041] In this embodiment, the oxidizing air is evenly distributed by the guide vanes on the guide cone 2 at the inlet of the device and enters its respective flow channel. Following the curvature of the guide vanes, the airflow direction changes from flowing downward along the branch pipe to flowing out of the guide cone 2 in a near-horizontal tangential direction. After flowing out of the guide cone 2, the airflow comes into direct contact with the desulfurization slurry. Under the action of water pressure, the airflow is supported by the desulfurization slurry below the gas hood. The tangentially flowing airflow mixes with the desulfurization slurry to form a liquid-encapsulated gas state with large bubbles. Then, under the action of the bubble cutter 4 below the gas hood, the large bubbles are gradually broken into small bubbles and flow out of the aeration device from the edge of the gas hood 3. The horizontal inertial action caused by the airflow and the slurry will cause the bubbles to expand outward, so that the distribution range is much larger than the diameter of the device. The slurry oxidation aeration device developed in this utility model is a combination of multiple devices arranged in the absorption tower. Although the number of bubbles that can be distributed in the center of a single device is very small, this range will be compensated by the adjacent other devices, ultimately achieving uniform distribution of oxidizing air across the entire cross-section of the desulfurization tower slurry pool. Therefore, from the perspective of aeration uniformity, the slurry oxidation aeration device of this embodiment uses a unique swirling bubble cutting principle to cut the oxidizing air into a large number of small bubbles. Simultaneously, by arraying this device throughout the entire absorber slurry tank, the distribution of bubbles within the desulfurization slurry tank is more uniform compared to traditional oxygen gun coupled stirring devices. This significantly improves the mixing effect between the oxidizing air and the desulfurization slurry, thereby comprehensively enhancing the uniformity of the oxidation reaction throughout the slurry tank, avoiding localized insufficient or excessive oxidation, ensuring the stable and efficient conduct of the desulfurization reaction, and effectively guaranteeing the improvement of desulfurization efficiency.

[0042] In summary, the slurry oxidation aeration device of this utility model embodiment is a novel desulfurization slurry forced oxidation aeration device. This device uses a bubble cutter to break the large stream of oxidation air from the large-diameter airflow channel into small bubbles, which avoids the problem of easy clogging of the small-diameter oxidation air duct, and also avoids the problem of uneven air distribution in the oxygen gun plus stirring aeration method.

[0043] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A slurry oxidation aeration device placed inside a desulfurization absorption tower slurry pool in a wet desulfurization process; characterized in that, The slurry oxidation aeration device includes: an interface, a flow guide cone, an air hood, and a bubble cutter; The small end of the guide cone is connected to the oxidation air aeration branch pipe through the interface. The guide cone includes a central cone and multiple guide vanes disposed on the central cone. The guide vanes deflect clockwise or counterclockwise around the central cone. The guide cone is covered by an air hood. An airflow channel is formed between adjacent guide vanes, the central cone and the air hood. The air inlet direction of all the airflow channels is coaxial with the vertical axis of the central cone, and the air outlet direction of all the airflow channels is horizontal clockwise or counterclockwise. The lower surface of the air hood is provided with an array of bubble cutters, which are used to cut large bubbles from the airflow channel into smaller bubbles.

2. The slurry oxidation sparger of claim 1 wherein, The slurry oxidation aeration device is installed in at least one layer inside the slurry pool of the desulfurization absorption tower, and multiple devices are installed in each layer. The oxidation air aeration branch pipe is connected to the oxidation air aeration main pipe, and the oxidation air aeration main pipe is connected to an oxidation blower.

3. The slurry oxidation sparger of claim 1 wherein, The interface is a flange interface, the flange interface size is DN50 or DN80, and the length of the short section connected to the flange is 100~200mm.

4. The slurry oxidation sparger of claim 1 wherein, The small end of the guide cone has a diameter of 50 or 80 mm, the large end has a diameter of 150-200 mm, and the height is 100-150 mm.

5. The slurry oxidation sparger of claim 1 wherein, The number of guide vanes is 3 to 8, the outer edge of the guide vanes is tightly connected to the air cover, and the thickness of the guide vanes is 3 mm and the width is 20 to 25 mm.

6. The slurry oxidation sparger of claim 1 wherein, At the starting end of the air intake, the guide vanes are aligned with the airflow direction. The airflow is divided by N guide vanes and enters N-1 airflow channels, causing the oxidizing air to flow out of the guide vane tangentially.

7. The slurry oxidation sparger of claim 1 wherein, The air hood is a two-section cone with a wall thickness of 3-5mm, including a first air hood cone and a second air hood cone; the taper of the first air hood cone is consistent with that of the guide cone and is tightly connected to the guide vanes provided on the guide cone; the inner diameter of the small end of the first air hood cone is 50 or 80mm, and the height of the first air hood cone is 10-20mm smaller than that of the guide cone, so that the guide cone extends from the bottom of the first air hood cone and is placed inside the second air hood cone.

8. The slurry oxidation sparger of claim 7 wherein, The diameter of the small end of the second air hood cone is 140~180mm, the diameter of the large end is 400~600mm, and the height is 50~60mm.

9. The slurry oxidation sparger of claim 7 wherein, Bubble cutters are evenly arrayed below the second air hood cone.

10. The slurry oxidation sparger of claim 9 wherein, The bubble cutter is a cylindrical or triangular prism-shaped column with a length of 50-110mm. The upper end of the bubble cutter is connected to the lower part of the second air hood cone, and the lower ends of each bubble cutter are kept flush.

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