Boiler flue gas desulfurization system
By introducing a normalized phase change bed and multi-stage spray assembly into the boiler flue gas desulfurization system, the problems of poor gas-liquid separation effect and ammonia escape are solved, and efficient sulfur dioxide removal and dust removal are achieved, reducing the operating pressure drop.
Patent Information
- Application Number
- CN202422361655.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-26
AI Technical Summary
The existing boiler flue gas desulfurization equipment has problems such as poor gas-liquid separation effect, flue gas water corrosion equipment, ammonia escape and flue gas tailing.
The normalized phase change flushing spray assembly is adopted, including the normalized phase change bed and the spray assembly. The flue gas is in the countercurrent contact with the desulfurization liquid, and pollutants are trapped by inertia impact of the filler ball, and spraying is circulated through the multi-stage phase change bed and liquid collector, combining the defogger and gas-liquid separator to achieve efficient desulfurization and dust removal.
Improves gas-liquid separation efficiency, reduces water and ammonia escape from flue gas, avoids equipment corrosion and aerosol generation, and achieves more efficient sulfur dioxide removal and lower operating pressure drop.
Smart Images
Figure CN223144453U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of boiler flue gas treatment, in particular to a boiler flue gas desulfurization system with high gas-liquid separation efficiency. Background Technique
[0002] In waste gas treatment, a desulfurization tower is usually used to absorb sulfur dioxide in the flue gas. The waste gas enters the concentration section of the desulfurization tower from the lower part of the spray tower, contacts the secondary spray slurry countercurrently, is cooled by washing after being showered, and then enters the absorption section to contact the primary slurry with 20% ammonia water added countercurrently to absorb sulfur dioxide in the flue gas. The desulfurized flue gas is discharged from the chimney at the top of the tower through a demister.
[0003] At present, the flue gas of the desulfurization tower carries water, the gas-liquid separation effect is poor, which causes serious corrosion to the surrounding equipment and environment, and the existing flue gas desulfurization equipment has serious ammonia escape and flue gas tailing phenomena. Content of the Utility Model
[0004] Therefore, the utility model provides a boiler flue gas ammonia desulfurization system with high gas-liquid separation efficiency.
[0005] In view of the above technical problems, the utility model provides the following technical solutions:
[0006] A boiler flue gas desulfurization system includes a desulfurization tower and a regulated flow phase change flushing spray assembly arranged in the desulfurization tower. The regulated flow phase change flushing spray assembly includes: at least one group of regulated flow phase change beds, and packing balls are arranged in the regulated flow phase change beds; a spray assembly, which includes a first flue gas spray assembly and a phase change bed spray assembly. The first flue gas spray assembly sprays towards the lower side of the desulfurization tower, and the phase change bed spray assembly sprays towards the lower side of the regulated flow phase change bed.
[0007] In some embodiments of the utility model, the first flue gas spray assembly is located below the regulated flow phase change bed, and the flue gas inlet of the desulfurization tower is located below the first flue gas spray assembly.
[0008] In some embodiments of the utility model, the regulated flow phase change bed includes a first-stage regulated flow phase change bed located at the lower side and a second-stage regulated flow phase change bed located at the upper side. The phase change bed spray assembly includes a first-stage phase change bed spray assembly and a second-stage phase change bed spray assembly. The first-stage phase change bed spray assembly sprays towards the lower side of the first-stage regulated flow phase change bed, and the second-stage phase change bed spray assembly sprays towards the lower side of the second-stage regulated flow phase change bed.
[0009] In some embodiments of the utility model, it further includes a liquid collector, which includes a first-stage liquid collector and a second-stage liquid collector. The first-stage liquid collector is located below the first flue gas spray assembly, and the second-stage liquid collector is located below the second-stage phase change bed spray assembly.
[0010] In some embodiments of the present utility model, a liquid storage area for accommodating desulfurized liquid is provided at the lower side of the desulfurization tower. The first flue gas spraying assembly is communicated with the liquid storage area through a first suction pump, and the first-stage phase change bed spraying assembly is communicated with the liquid storage area through a second suction pump; the first-stage liquid collector is communicated with the liquid storage area through a pipeline.
[0011] In some embodiments of the present utility model, it further includes a water seal tank. The second-stage phase change bed spraying assembly is communicated with the water seal tank through a third suction pump; the second-stage liquid collector is communicated with the water seal tank through a pipeline.
[0012] In some embodiments of the present utility model, it further includes a circulation tank for accommodating desulfurized liquid. The circulation tank is communicated with the desulfurization tower through a circulation pipeline, and a fourth suction pump is provided on the circulation pipeline.
[0013] In some embodiments of the present utility model, the desulfurization tower includes a desulfurized liquid inlet and a desulfurized liquid outlet that are communicated with the circulation pipeline of the circulation tank. The desulfurized liquid inlet is located below the lowest-stage liquid collector, and the desulfurized liquid outlet is located below the flue gas inlet.
[0014] In some embodiments of the present utility model, the spraying assembly further includes a second flue gas spraying assembly. The second flue gas spraying assembly is communicated with the desulfurized liquid inlet and sprays downward toward the desulfurization tower.
[0015] In some embodiments of the present utility model, it further includes a demister, a demisting pad, and a gas-liquid separator. The demister is located above the uppermost-stage regulated flow phase change bed, the demisting pad is located above the demister, and the gas-liquid separator is located above the demisting pad.
[0016] The technical solution of the present utility model has the following technical effects compared with the prior art:
[0017] In the boiler flue gas desulfurization system provided by the present utility model, by arranging at least one set of regular flow phase change beds, dust, droplets, and sulfur dioxide carried in the flue gas are captured by the liquid film due to inertial impact on the surface of the packing balls. The packing balls move regularly and continuously. When the amount of the liquid film on its surface reaches a certain degree, that is, when the gravity of the liquid film droplets is greater than the tension of the droplets on the surface of the packing balls, the droplets will fall, thus completing the efficient adsorption process of pollutants in the flue gas. Using a small amount of desulfurization spray circulating liquid can achieve the effect of efficiently removing sulfur dioxide. Without changing the original liquid-gas ratio, it has the function of desulfurization efficiency increase, can effectively absorb volatile ammonia, control ammonia escape, avoid the generation of aerosols, efficiently remove dust and fog, and achieve higher gas-liquid separation efficiency, lower operating pressure drop, and a wider operating flexibility range, avoid the situation of flue gas carrying water and trailing, and complete the efficient adsorption process of pollutants in the flue gas. At the same time, a spray component is arranged on the lower side of the regular flow phase change bed to avoid the problem that impurities in the liquid block the regular flow phase change bed caused by arranging the spray component on the upper side. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The following will describe in detail the preferred embodiments of the present utility model with the help of the drawings, which will help to understand the purpose and advantages of the present utility model, wherein:
[0019] Figure 1 It is a structural schematic diagram of a specific embodiment of the boiler flue gas desulfurization system of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] The following will clearly and completely describe the technical solutions of the present utility model with the help of the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0021] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0022] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0023] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.
[0024] As Figure 1 shown in the figure is a specific embodiment of the boiler flue gas desulfurization system (hereinafter referred to as the desulfurization system) of the present utility model, which is used to absorb sulfur dioxide in the flue gas. The desulfurization system includes a desulfurization tower 1 and a regulated flow phase change flushing spray assembly arranged inside the desulfurization tower 1. The regulated flow phase change flushing spray assembly includes at least one group of regulated flow phase change beds, and packing balls are arranged in the regulated flow phase change beds; a spray assembly, the spray assembly includes a first flue gas spray assembly 20 and a phase change bed spray assembly. The first flue gas spray assembly 20 sprays towards the lower side of the desulfurization tower 1, and the phase change bed spray assembly sprays towards the lower side of the regulated flow phase change bed.
[0025] In the above desulfurization system, by arranging at least one group of regulated flow phase change beds, the dust, droplets, and sulfur dioxide carried in the flue gas are captured by the liquid film due to inertial impact on the surface of the packing balls. The packing balls move regularly continuously. When the amount of the liquid film on its surface reaches a certain degree, that is, when the gravity of the liquid film droplets is greater than the tension of the droplets on the surface of the packing balls, the droplets will fall, thus completing the efficient adsorption process of the pollutants in the flue gas. Using a small amount of desulfurization spray circulating liquid can achieve the effect of efficiently removing sulfur dioxide. Without changing the original liquid-gas ratio, it has the function of desulfurization efficiency enhancement, can effectively absorb volatile ammonia, control ammonia escape, avoid the generation of aerosols, efficiently remove dust and mist, and achieve higher gas-liquid separation efficiency, lower operating pressure drop, and a wider operating flexibility range with a lower operating pressure drop, avoid the situation of flue gas carrying water and trailing, and complete the efficient adsorption process of the pollutants in the flue gas. At the same time, a spray assembly is arranged on the lower side of the regulated flow phase change bed to avoid the problem that impurities in the liquid block the regulated flow phase change bed caused by arranging the spray assembly on the upper side.
[0026] Specifically, in an alternative embodiment, the flue gas inlet 9 of the desulfurization tower 1 is located below the first flue gas spraying assembly 20, and the first flue gas spraying assembly 20 is located below the regulated flow phase change bed. After the flue gas enters the desulfurization tower 1, it first passes through the first flue gas spraying assembly 20. The first flue gas spraying assembly 20 sprays the desulfurization liquid with 20% concentrated ammonia water, contacts the flue gas countercurrently, absorbs sulfur dioxide in the flue gas, and the desulfurized flue gas is discharged from the chimney at the top of the tower through the demister.
[0027] Specifically, in an alternative embodiment, the regulated flow phase change bed includes a first-stage regulated flow phase change bed 3 located at the lower side and a second-stage regulated flow phase change bed 5 located at the upper side. The phase change bed spraying assembly includes a first-stage phase change bed spraying assembly 2 and a second-stage phase change bed spraying assembly 4. The first-stage phase change bed spraying assembly 2 sprays towards the lower side of the first-stage regulated flow phase change bed 3, and the second-stage phase change bed spraying assembly 4 sprays towards the lower side of the second-stage regulated flow phase change bed 5. By arranging two groups of regulated flow phase change beds, multi-stage desulfurization of the flue gas can be carried out.
[0028] Specifically, in an alternative embodiment, the desulfurization system further includes a liquid collector for collecting the liquid after being sprayed by the spraying assembly and reacting with the flue gas. The liquid collector includes a first-stage liquid collector 16 and a second-stage liquid collector 18. The first-stage liquid collector 16 is located below the first flue gas spraying assembly 20 and is used for collecting the liquid formed after being sprayed by the first-stage phase change bed spraying assembly 2 and reacting with the flue gas. The second-stage liquid collector 18 is located below the second-stage phase change bed spraying assembly 4 and is used for collecting the liquid formed after being sprayed by the second-stage phase change bed spraying assembly 4 and reacting with the flue gas.
[0029] Specifically, in an alternative embodiment, a liquid storage area 21 for accommodating the desulfurization liquid is provided below the desulfurization tower 1. The first flue gas spraying assembly 20 is communicated with the liquid storage area 21 through a first suction pump 12, and the first-stage phase change bed spraying assembly 2 is communicated with the liquid storage area 21 through a second suction pump 13; the first-stage liquid collector 16 is communicated with the liquid storage area 21 through a pipeline. The desulfurization liquid is 20% concentrated ammonia water. The first-stage regulated flow phase change bed 3 is flushed with the first-stage circulating desulfurization liquid, and the flushed slurry flows back to the oxidation section through the first-stage return pipe 17 by the first-stage liquid collector 16 for circulation.
[0030] Specifically, in an alternative embodiment, the desulfurization system further includes a water seal tank 14 for accommodating water. The second-stage phase change bed spraying assembly 4 is communicated with the water seal tank 14 through a third suction pump 15; the second-stage liquid collector 18 is communicated with the water seal tank 14 through a second-stage return pipeline 19. The second-stage regulated flow phase change bed 5 is flushed with the water seal circulating slurry, and the flushed slurry flows back to the water seal tank 14 through the second-stage return pipeline 19 by the second-stage liquid collector 18 for circulation.
[0031] Specifically, in an alternative embodiment, the desulfurization system further includes a circulation tank 10 for containing desulfurization liquid. The circulation tank 10 is connected to the desulfurization tower 1 through a circulation pipeline, and a fourth suction pump 11 is provided on the circulation pipeline. The fourth suction pump 11 is used to suck the desulfurization liquid in the circulation tank 10 into the desulfurization tower 1 for desulfurization reaction with the flue gas. More specifically, the desulfurization tower 1 includes a desulfurization liquid inlet and a desulfurization liquid outlet connected to the circulation pipeline of the circulation tank 10. The desulfurization liquid inlet is located below the lowest-level liquid collector, and the desulfurization liquid outlet is located below the flue gas inlet 9.
[0032] The spray assembly further includes a second flue gas spray assembly 22. The second flue gas spray assembly 22 is connected to the desulfurization liquid inlet and sprays downward toward the desulfurization tower 1. After the flue gas enters the desulfurization tower 1 from the flue gas inlet 9, it first undergoes a desulfurization reaction with the desulfurization liquid sprayed by the second flue gas spray assembly 22, and then enters the first-stage regulated flow phase change bed 3 and the second-stage regulated flow phase change bed 5.
[0033] Specifically, in an alternative embodiment, the desulfurization system further includes a demister 6, a demisting pad 7, and a gas-liquid separator 8. The demister 6 is located above the uppermost regulated flow phase change bed, the demisting pad 7 is located above the demister 6, and the gas-liquid separator 8 is located above the demisting pad 7. The demister 6 is a roof-type demister 6, the demisting pad 7 is a wire mesh demisting pad 7, and the gas-liquid separator 8 is a vane-type gas-liquid separator 8, which is internally provided with a falling liquid reflux system and a vane washing system. By arranging the demister 6 in the desulfurization tower 1, two layers of roof-type demisters 6 and one layer of wire mesh demisting pads 7 are installed above the second-stage regulated flow phase change bed 5, and a process water washing nozzle and system are added. The mist droplets separated from the flue gas and the washing water generated by the washing system are refluxed to the water seal tank 14 through the water seal reflux pipe by the second-stage liquid collector 18 for circulation, and water is supplied to the oxidation section.
[0034] When the desulfurization system is in use, the flue gas first enters the concentration section of the desulfurization tower 1 through the original flue, then continues to rise. First, it is desulfurized by the second flue gas spray assembly 22 and two layers of the first flue gas spray assemblies 20, then enhanced by the first-stage regulated flow phase change bed 3 to further improve the desulfurization efficiency of sulfur dioxide, reduce the pH value of the first-stage circulating slurry, reduce ammonia escape, thereby reducing the aerosol generated in the subsequent flue gas, and then undergoes water seal spraying by the second-stage phase change bed spray assembly 4 and the second-stage regulated flow phase change bed 5 to remove dust, sulfur dioxide, and mist droplets in the flue gas again. The flue gas continues to flow upward, passes through two layers of roof-type demisters 6, one layer of wire mesh demisting pad 7, and the vane-type gas-liquid separator 8 to further remove a small amount of mist droplets and dust in the flue gas. Finally, the purified flue gas is discharged into the atmosphere through the chimney.
[0035] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.
Claims
1. A boiler flue gas desulfurization system, comprising a desulfurization tower and a regulated flow phase change flushing spray assembly disposed in the desulfurization tower, characterized in that, The flow-regulating phase-change flushing and spraying assembly includes: At least one set of flow-regulating phase-change beds, with packing balls arranged inside the flow-regulating phase-change beds; A spraying assembly, which includes a first flue gas spraying assembly and a phase-change bed spraying assembly. The first flue gas spraying assembly sprays towards the lower side of the desulfurization tower, and the phase-change bed spraying assembly sprays towards the lower side of the flow-regulating phase-change beds.
2. The boiler flue gas desulfurization system according to claim 1, characterized in that, The first flue gas spraying assembly is located below the flow-regulating phase-change beds, and the flue gas inlet of the desulfurization tower is located below the first flue gas spraying assembly.
3. The boiler flue gas desulfurization system according to claim 2, characterized in that, The flow-regulating phase-change beds include a first-stage flow-regulating phase-change bed located at the lower side and a second-stage flow-regulating phase-change bed located at the upper side. The phase-change bed spraying assembly includes a first-stage phase-change bed spraying assembly and a second-stage phase-change bed spraying assembly. The first-stage phase-change bed spraying assembly sprays towards the lower side of the first-stage flow-regulating phase-change bed, and the second-stage phase-change bed spraying assembly sprays towards the lower side of the second-stage flow-regulating phase-change bed.
4. A boiler flue gas desulfurization system according to claim 3, characterized in that, It further includes a liquid collector, which includes a first-stage liquid collector and a second-stage liquid collector. The first-stage liquid collector is located below the first flue gas spraying assembly, and the second-stage liquid collector is located below the second-stage phase-change bed spraying assembly.
5. A boiler flue gas desulfurization system according to claim 4, characterized in that, A liquid storage area for accommodating desulfurization liquid is provided at the lower side of the desulfurization tower. The first flue gas spraying assembly is communicated with the liquid storage area through a first suction pump, and the first-stage phase-change bed spraying assembly is communicated with the liquid storage area through a second suction pump; the first-stage liquid collector is communicated with the liquid storage area through a pipeline.
6. The boiler flue gas desulfurization system according to claim 5, wherein It further includes a water seal tank. The second-stage phase-change bed spraying assembly is communicated with the water seal tank through a third suction pump; the second-stage liquid collector is communicated with the water seal tank through a pipeline.
7. A boiler flue gas desulfurization system according to claim 6, characterized in that, It further includes a circulation tank for accommodating desulfurization liquid. The circulation tank is communicated with the desulfurization tower through a circulation pipeline, and a fourth suction pump is provided on the circulation pipeline.
8. A boiler flue gas desulfurization system according to claim 7, characterized in that, The desulfurization tower includes a desulfurization liquid inlet and a desulfurization liquid outlet that are communicated with the circulation pipeline of the circulation tank. The desulfurization liquid inlet is located below the lowest-level liquid collector, and the desulfurization liquid outlet is located below the flue gas inlet.
9. A boiler flue gas desulfurization system according to claim 8, characterized in that, The spraying assembly further includes a second flue gas spraying assembly, which is communicated with the desulfurization liquid inlet and sprays towards the lower side of the desulfurization tower.
10. A boiler flue gas desulfurization system according to claim 1, characterized in that, It further includes a demister, a deentrainer, and a gas-liquid separator. The demister is located above the uppermost flow-regulating phase-change bed, the deentrainer is located above the demister, and the gas-liquid separator is located above the deentrainer.