Ammonia desulfurization device
By optimizing the design and process parameters in the ammonia desulfurization device, the problems of flue gas tailing and ultra-low emission requirements are solved, and efficient sulfur dioxide removal and low energy consumption desulfurization effects are achieved.
Patent Information
- Application Number
- CN202421126212.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-05-22
AI Technical Summary
The ammonia desulfurization device has severe flue gas tailing when treating flue gas, resulting in secondary visual pollution and equipment corrosion. It is difficult to meet the ultra-low emission level of 35mg/m3 sulfur dioxide emission quality concentration requirements.
By optimizing the design of the ammonia desulfurization device, it includes setting up a slurry section, backwash pump, pulse pump, circulation pump and spray pipe in the absorption tower, controlling the operating liquid level in the oxidation section, improving the oxidation effect, and optimizing spray and drum In the bubble process, use an absorbent liquid with a pH of 4.5 to 5.5, and flush it regularly to prevent blockage.
The sulfur dioxide emission in the flue gas is achieved by reducing the sulfur dioxide emissions by less than 35mg/m3, the smoke concentration is less than 10mg/m3, and the desulfurization efficiency is 96%-99%. At the same time, the power consumption is reduced by more than 10%, and the system stability and adaptability are improved.
Smart Images
Figure CN222468625U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ammonia desulfurization devices, in particular to an ammonia desulfurization device. Background Art
[0002] The flue gas emissions from coal-fired chimneys often have the phenomenon of flue gas tailing (the tailing flue gas is called "smoke rain"). This phenomenon is particularly serious when using desulfurization processes such as ammonia desulfurization. The flue gas tail is sometimes as long as hundreds of meters, and the secondary visual pollution caused has become the focus of environmental protection. The scattered "ammonium sulfate rain" causes serious corrosion to surrounding equipment. In addition, with the improvement of environmental protection emission requirements, the mass concentration of sulfur dioxide emissions is required to reach an ultra-low emission level of 35mg / m3, which further makes the flue gas tailing phenomenon more serious. In order to solve the above technical problems, in order to solve this technical problem, it is necessary to optimize and improve the ammonia desulfurization device. Therefore, there is an urgent need for an ammonia desulfurization device to solve the above technical problems. Utility Model Content
[0003] The purpose of the utility model is to provide an ammonia desulfurization device. To achieve the above purpose, the utility model provides the following technical solutions:
[0004] An ammonia desulfurization device comprises an absorption tower, wherein the lower end of the absorption tower has a slurry section, and a backwash pump is connected to the left side of the absorption tower, the flue gas from the boiler induced draft fan enters the absorption tower, and a pulse pump is connected to the right side of the lower end of the absorption tower, the lower end of the absorption tower is connected to a gypsum dehydration tank and a reuse water tank respectively through a slurry pump, a plurality of circulation pumps are connected to the absorption tower, a blower passes through the absorption tower through an air pipe, and is connected to a distribution tank and a pulping tank through a slurry delivery pump.
[0005] Preferably, three groups of circulating pumps are provided in total, and the three groups have the same model and specifications.
[0006] Preferably, a first spray pipe, a second spray pipe and a third spray pipe are respectively provided in the absorption tower, and a demisting and flushing system is provided above the first spray pipe.
[0007] Preferably, the first spray pipe, the second spray pipe and the third spray pipe are all arranged to spray downward.
[0008] Preferably, the lower left end of the absorption tower is connected to the accident slurry pool through an accident water pump.
[0009] Preferably, the distribution pool is located in the middle of the pulp delivery pump and the pulping pool.
[0010] Compared with the prior art, the utility model has the following beneficial effects: the ammonia desulfurization device controls the operating liquid level in the oxidation section, improves the working performance of the oxidation effect, increases the pressure of the oxidation wind, adds a flushing water pipeline to the compressed air pipe, and regularly flushes to prevent blockage, ensuring that the pressure of the oxidation wind is controlled at 70-80 kPa. Through cross-tests, by selecting an absorption liquid with a pH of 4.5-5.5, the oxidation rate of the slurry system is increased to more than 99.8%.
[0011] By using the spray bubbling characteristics, the two process characteristics of spraying and bubbling are met in one tower body. The flue gas is fully mixed with the slurry bubble in the oxidation section, and is fully sprayed in the concentration section and absorption section. While having a high desulfurization efficiency, it has a good dust removal effect. The desulfurization efficiency is 96%-99%, and the SO2 emission of the flue gas at the system outlet is less than 35mg / m 3 , smoke concentration is less than 10mg / m 3 It makes full use of the high-efficiency sections of the two processes, improves efficiency and reduces energy consumption, and reduces power consumption by more than 10% compared with similar desulfurization devices. It has large flue gas load elasticity and good gas equalization effect, and is suitable for different working conditions. The system has strong stability and can adjust the desulfurization efficiency by adjusting the slurry level to adapt to different coal types and chimney load changes. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:
[0013] Figure 1 This is a schematic diagram of the overall structure of the ammonia desulfurization device of the utility model;
[0014] In the figure: 1. backwash pump; 2. absorption tower; 3. slurry section; 4. blower; 5. chimney; 6. pulse pump; 7. slurry pump; 8. accident slurry pool; 9. accident water pump; 10. gypsum dehydration pool; 11. recycled water pool; 12. distribution pool; 13. slurry delivery pump; 14. slurry making pool; 15. circulation pump; 16. first spray pipe; 17. second spray pipe; 18. third spray pipe; 19. demisting and flushing system. DETAILED DESCRIPTION
[0015] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It should also be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. The different types of section lines in the drawings in the embodiments of the utility model are not marked according to the national standard, nor are there any requirements for the materials of the components, but are used to distinguish the cross-sectional views of the components in the drawings.
[0016] See also Figure 1 An ammonia desulfurization device includes an absorption tower 2, wherein the lower end of the absorption tower 2 has a slurry section 3, and a backwash pump 1 is connected to the left side of the absorption tower 2, the flue gas from the chimney 5 boiler induced draft fan enters the absorption tower 2, and a pulse pump 6 is connected to the right side of the lower end of the absorption tower 2, the lower end of the absorption tower 2 is connected to a gypsum dehydration tank 10 and a reuse water tank 11 respectively through a slurry pump 7, a plurality of circulation pumps 15 are connected to the absorption tower 2, a blower 4 passes through the absorption tower 2 through an air pipe, and is connected to a distribution tank 12 and a pulping tank 14 through a slurry pump 13.
[0017] Among them, there are three groups of circulating pumps 15, and the three groups have the same model and specifications.
[0018] The absorption tower 2 is provided with a first spray pipe 16 , a second spray pipe 17 , and a third spray pipe 18 , respectively. A demisting and flushing system 19 is provided above the first spray pipe 16 .
[0019] Among them, the first spray pipe 16, the second spray pipe 17 and the third spray pipe 18 are all arranged to spray downward.
[0020] The lower left end of the absorption tower 2 is connected to the accident slurry pool 8 through an accident water pump 9 .
[0021] The distribution pool 12 is located in the middle of the pulp delivery pump 13 and the pulp making pool 14 .
[0022] It should be noted that, in the ammonia desulfurization device, the absorption tower 2 is respectively provided with a first spray pipe 16, a second spray pipe 17, and a third spray pipe 18, and the first spray pipe 16, the second spray pipe 17 and the third spray pipe 18 are all arranged to spray downward.
[0023] The ammonia desulfurization device is sequentially arranged from bottom to top as an oxidation section, a concentration section, an absorption section, a demisting and flushing system 19, and a smoke outlet. The oxidation section includes a backwashing pump 1, a demisting and flushing system 19, an absorption tower 2, a circulation pump 15, and a chimney 5; the concentration section includes an accident slurry pool 8, a slurry pump 7, a gypsum dehydration pool 10, a recycled water pool 11, and an accident water pump 9; the absorption section includes a slurry delivery pump 13, a distribution pool 12, and a slurry making pool 14;
[0024] Among them, the concentration section is connected with the oxidation section; wherein the concentration section is provided with a flue gas inlet for introducing flue gas into the concentration section; the first spray pipe 16, the second spray pipe 17 and the third spray pipe 18 in the absorption tower 2 are all arranged to spray downward, and the first spray pipe 16, the second spray pipe 17 and the third spray pipe 18 are arranged to be connected with the oxidation section to realize primary circulation spraying; the oxidation section is connected with the absorption section through the flue gas riser; wherein the oxidation section is provided with an oxidation device, which is arranged to be connected with compressed air; the absorption medium inlet is arranged to introduce ammonia gas or ammonia water into the oxidation section; the circulation output port is arranged to be connected with the circulation tank, and the ammonium sulfate output port; the absorption section is isolated from the concentration section, and a spray device is arranged in the absorption section, which is arranged to be connected with the circulation tank, and the absorption section is arranged to be connected to the oxidation section through a reflux device to realize reflux; the demisting and flushing system for ammonia desulfurization is connected with the absorption section and the flue gas outlet.
[0025] The flue gas enters the desulfurization device through the flue gas inlet, and is cooled by the process cooling water transported by the process cooling water pipe. In the concentration section, the flue gas is fully mixed with the ammonia water brought by the primary circulation pump. The mixed flue gas passes through the flue gas grid plate evenly, and is further mixed with the ammonia gas in the ammonia spraying pipe in the ammonia spraying section, and then is mixed with the slurry in the oxidation section through the flue gas bubbling tube. The air compressor passes the compressed air into the oxidation section. The compressed air in the compressed air pipe reacts with (NH4)2S03 to generate (NH4)2S04. The clean flue gas enters the absorption section through the flue gas riser, and is sprayed by the secondary circulation spray pipe in the absorption section. The contact area between the gas phase and the liquid phase is increased through the packing layer, and a small amount of it is further reacted with ammonia water to generate (NH4)2S03, which returns to the oxidation section through the reflux pipe for oxidation reaction again. The flue gas passes through the first spray pipe 16, the second spray pipe 17 and the third spray pipe 18, and after being processed by the demisting and flushing system 19, it is discharged into the atmosphere through the chimney 5;
[0026] The contents not described in detail in this specification belong to the prior art known to professionals in this field.
[0027] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.
Claims
1. An ammonia desulfurization device, comprising an absorption tower (2), characterized in that: The lower end of the absorption tower (2) has a slurry section (3), and a backwash pump (1) is connected to the left side of the absorption tower (2). Flue gas from a boiler draft fan enters the absorption tower (2), and a pulse pump (6) is connected to the right side of the lower end of the absorption tower (2). The lower end of the absorption tower (2) is connected to a gypsum dehydration tank (10) and a recycling water tank (11) respectively through a slurry pump (7). A plurality of circulation pumps (15) are connected to the absorption tower (2). A blower (4) passes through the absorption tower (2) through an air pipe, and is connected to a distribution tank (12) and a pulping tank (14) through a slurry delivery pump (13).
2. The ammonia desulfurization device according to claim 1, characterized in that: The circulating pumps (15) are provided in three groups in total, and the three groups have the same model and specifications.
3. The ammonia desulfurization device according to claim 1, characterized in that: A first spray pipe (16), a second spray pipe (17), and a third spray pipe (18) are respectively arranged in the absorption tower (2), and a demisting and flushing system (19) is arranged above the first spray pipe (16).
4. The ammonia desulfurization device according to claim 3, characterized in that: The first spray pipe (16), the second spray pipe (17) and the third spray pipe (18) are all arranged to spray downward.
5. The ammonia desulfurization device according to claim 1, characterized in that: The lower left end of the absorption tower (2) is connected to the accident slurry pool (8) via an accident water pump (9).
6. The ammonia desulfurization device according to claim 1, characterized in that: The distribution pool (12) is located in the middle of the pulp delivery pump (13) and the pulp making pool (14).