Anti-blocking ammonia injection device for fluidized bed SNCR device

Abstract

The utility model discloses an anti-blocking ammonia injection device for a fluidized bed SNCR (selective non-catalytic reduction) device, and belongs to the technical field of flue gas desulfurization. Comprising a fluidized bed SNCR device shell, a reaction cylinder is arranged in an inner cavity of the fluidized bed SNCR device shell, a spraying disc is arranged on the upper portion of the reaction cylinder, a plurality of evenly-distributed spraying holes are formed in the bottom of the spraying disc, one side of the upper portion of the spraying disc is communicated with an ammonia water pipe, the other side of the upper portion of the spraying disc is communicated with a circulating pipe, and the ammonia water pipe is provided with a high-pressure air pipe. And the high-pressure air pipe is arranged outside the fluidized bed SNCR device shell and is provided with an electromagnetic valve. After the technical scheme is adopted, compared with the prior art, the spraying device has the advantages that in order to prevent the spraying disc from being blocked, the electromagnetic valve of the high-pressure air pipe is opened at regular time, pulse airflow is formed, and the spraying disc is dredged. Meanwhile, the motor is started regularly, the bottom of the spraying disc is scraped through the scraper A, and the spraying disc is prevented from being blocked.

Description

Technical Field

[0001] The utility model relates to an anti-blocking ammonia injection device for a fluidized bed SNCR device, belonging to the technical field of flue gas desulfurization. Background Art

[0002] A large amount of flue gas is often generated in industrial production, such as power generation, smelting, heating, etc. The flue gas carries a large amount of harmful substances, among which SO2 is one of the main components. If it is not treated and directly discharged into the atmosphere, it will not only form acid rain and damage the environment, but also cause a variety of respiratory diseases. In recent years, with the continuous strengthening of environmental governance calls, the state has put forward increasingly stringent emission standards for the SO2 content in industrial flue gas. Therefore, flue gas denitrification has become a hot topic at present, among which the selective non-catalytic reduction method (SNCR) is the most widely used. The fluidized bed SNCR device is arranged from bottom to top in order from the elevation: oxidation section → concentration section → absorption section → demisting section. After the high-temperature flue gas enters the fluidized bed SNCR device in the concentration section, it passes through the nozzle layer of the concentration section and rises through the ventilation window at the junction of the concentration section and the absorption and oxidation sections to enter the absorption and oxidation sections. The flue gas is cooled and washed in the concentration section, and the droplets of the washing slurry are flash evaporated and crystallized into solid droplets. Under the action of intense and complex heat exchange and fluid dynamics, some of the fine droplets are condensed into ammonium sulfate solids and accumulated on the nozzle layer and the upper part of the support beam of the concentration section, resulting in a reduction in the flue gas flow area of ​​the nozzle layer, an increase in the resistance of the fluidized bed SNCR device, and the nozzle layer being broken by the ammonium sulfate crystals. Some of them are accumulated at the bottom of the ventilation window, blocking the flue gas flow area and causing an increase in the resistance of the fluidized bed SNCR device. Some of them are accumulated on the tower wall of the concentration section at the bottom of the nozzle layer, forming a huge ammonium sulfate hanging on the wall. Some of the crystals are deposited at the bottom of the concentration section, resulting in poor discharge of the concentration section and liquid blocking, which seriously affects the normal operation of the device.

[0003] Therefore, some manufacturers install anti-blocking ammonia injection devices, but traditional anti-blocking ammonia injection devices cannot be cleared in time, resulting in uneven ammonia injection after blockage. In addition, traditional anti-blocking ammonia injection devices cannot clean the outside of the anti-blocking ammonia injection devices, resulting in low anti-blocking ability.

[0004] In summary, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide an anti-blocking ammonia injection device for a fluidized bed SNCR device, which can timely dredge the injection device and prevent the injection device from being blocked.

[0006] An optimization scheme, an anti-blocking ammonia injection device for a fluidized bed SNCR device, comprising a fluidized bed SNCR device shell, an inner cavity of the fluidized bed SNCR device shell is provided with a reaction cylinder, a spray plate is provided on the upper part of the reaction cylinder, and a plurality of evenly distributed spray holes are provided at the bottom of the spray plate;

[0007] One side of the upper part of the spray plate is connected to an ammonia water pipe, and the other side of the upper part of the spray plate is connected to a circulation pipe;

[0008] The ammonia water pipe is provided with a high-pressure gas pipe, which is arranged outside the shell of the fluidized bed SNCR device and is provided with a solenoid valve.

[0009] Furthermore, a waste gas pipe is provided at the bottom of the side wall of the fluidized bed SNCR device shell, the end of the waste gas pipe is connected to the bottom of the side wall of the reaction cylinder, and the waste gas pipe arranged outside the fluidized bed SNCR device shell is provided with a one-way gas valve;

[0010] The upper opening of the reaction cylinder is connected with a conical hopper, the large-diameter opening of the conical hopper is arranged at the bottom of the spray plate, and the small-diameter opening of the conical hopper is arranged at the upper part of the inner cavity of the reaction cylinder.

[0011] Furthermore, a motor is provided at the bottom of the fluidized bed SNCR device shell, the motor is connected to a rotating shaft, the rotating shaft is arranged in the inner cavity of the reaction cylinder, a scraper A is provided on the upper part of the rotating shaft, and the side wall of the scraper A is arranged to fit the bottom of the spray plate.

[0012] Furthermore, the middle part of the side wall of the scraper A is fixedly connected to the upper part of the rotating shaft, and the length of the scraper A is the same as the diameter of the spray plate.

[0013] Furthermore, the outer wall of the rotating shaft is provided with a plurality of evenly distributed scrapers B, and the side walls of the scrapers B are arranged to fit the inner wall of the reaction tube.

[0014] Furthermore, a circulation pump is connected to the bottom side wall of the fluidized bed SNCR device shell, and the circulation pump is connected to the circulation pipe.

[0015] Furthermore, an absorption chamber is provided at the upper part of the inner cavity of the shell of the fluidized bed SNCR device, a defogger chamber is provided at the upper part of the absorption chamber, and an air outlet chamber is provided at the upper part of the defogger chamber.

[0016] Furthermore, the reaction cylinder is suspended in the inner cavity of the fluidized bed SNCR device shell through a plurality of evenly distributed connecting plates.

[0017] Compared with the prior art, the utility model has the following advantages after adopting the above technical solution:

[0018] To prevent the spray plate from being blocked, the solenoid valve of the high-pressure air pipe is opened at a fixed time to form a pulse airflow to clear the spray plate. At the same time, the motor is started at a fixed time to scrape the bottom of the spray plate through the scraper A to prevent the spray plate from being blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the anti-blocking ammonia injection device for a fluidized bed SNCR device of the utility model;

[0020] Figure 2 It is a schematic cross-sectional structure diagram of the anti-blocking ammonia injection device for a fluidized bed SNCR device of the utility model;

[0021] In the figure, 1-fluidized bed SNCR device shell, 2-reaction cylinder, 3-spray plate, 4-ammonia pipe, 5-circulation pipe, 6-high-pressure air pipe, 7-solenoid valve, 8-exhaust pipe, 9-one-way air valve, 10-conical hopper, 11-motor, 12-rotating shaft, 13-scraper A, 14-scraper B, 15-circulation pump, 16-absorption chamber, 17-demist chamber, 18-air outlet chamber, 19-connecting plate. DETAILED DESCRIPTION

[0022] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "top surface", "bottom surface" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the positions or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] Examples, such as Figure 1 and 2As shown, the utility model provides an anti-blocking ammonia injection device for a fluidized bed SNCR device, comprising a fluidized bed SNCR device housing 1, a reaction cylinder 2 is arranged in the inner cavity of the fluidized bed SNCR device housing 1, a spray plate 3 is arranged on the upper part of the reaction cylinder 2, and a plurality of evenly distributed spray holes are arranged at the bottom of the spray plate 3;

[0026] An ammonia water pipe 4 is connected to one side of the upper part of the spray plate 3, and a circulation pipe 5 is connected to the other side of the upper part of the spray plate 3;

[0027] The ammonia water pipe 4 is provided with a high-pressure gas pipe 6 , which is arranged outside the fluidized bed SNCR device housing 1 , and the high-pressure gas pipe 6 is provided with a solenoid valve 7 .

[0028] The bottom of the side wall of the fluidized bed SNCR device shell 1 is provided with an exhaust pipe 8, the end of the exhaust pipe 8 is connected to the bottom of the side wall of the reaction tube 2, and the exhaust pipe 8 arranged outside the fluidized bed SNCR device shell 1 is provided with a one-way gas valve 9;

[0029] The upper opening of the reaction tube 2 is connected to a conical hopper 10 , the large-diameter opening of the conical hopper 10 is arranged at the bottom of the spray plate 3 , and the small-diameter opening of the conical hopper 10 is arranged at the upper part of the inner cavity of the reaction tube 2 .

[0030] A motor 11 is provided at the bottom of the fluidized bed SNCR device shell 1, and the motor 11 is connected to a rotating shaft 12, which is arranged in the inner cavity of the reaction tube 2. A scraper A13 is provided on the upper part of the rotating shaft 12, and the side wall of the scraper A13 is arranged in contact with the bottom of the spray plate 3.

[0031] The middle part of the side wall of the scraper A13 is fixedly connected to the upper part of the rotating shaft 12 , and the length of the scraper A13 is the same as the diameter of the spray plate 3 .

[0032] The outer wall of the rotating shaft 12 is provided with a plurality of evenly distributed scrapers B14 , and the side walls of the scrapers B14 are arranged in close contact with the inner wall of the reaction tube 2 .

[0033] A circulation pump 15 is connected to the bottom side wall of the fluidized bed SNCR device shell 1 , and the circulation pump 15 is connected to the circulation pipe 5 .

[0034] An absorption chamber 16 is provided at the upper part of the inner cavity of the shell 1 of the fluidized bed SNCR device, a demisting chamber 17 is provided at the upper part of the absorption chamber 16 , and an air outlet chamber 18 is provided at the upper part of the demisting chamber 17 .

[0035] The reaction cylinder 2 is suspended in the inner cavity of the fluidized bed SNCR device housing 1 through a plurality of evenly distributed connecting plates 19 .

[0036] The working principle of this utility model:

[0037] Waste gas is introduced into the waste gas pipe 8, and ammonia water is introduced into the ammonia water pipe 4. The waste gas enters the reaction tube 2. The ammonia water is sprayed into the conical hopper 10 through the spray plate 3 to react with the waste gas in the reaction tube 2. At the same time, under the influence of the waste gas airflow, part of the waste gas and atomized ammonia water enter the absorption chamber 16 and continue to react in the absorption chamber 16. The excess ammonia water and the reactants produced after the reaction enter the spray plate 3 through the circulation pipe 5 and the circulation pump 15 for continued use to prevent the waste of ammonia water. The waste gas after desulfurization treatment is defogged in the defog chamber 17 and discharged through the air outlet chamber 18.

[0038] To prevent the spray plate 3 from being blocked, the electromagnetic valve 7 of the high-pressure air pipe 6 is opened regularly to form a pulse airflow to clear the spray plate 3. At the same time, the motor 11 is started regularly to scrape the bottom of the spray plate 3 through the scraper A13 to prevent the spray plate 3 from being blocked.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0040] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. Anti-blocking ammonia injection device for fluidized bed SNCR device, characterized by: It comprises a fluidized bed SNCR device shell (1), wherein the inner cavity of the fluidized bed SNCR device shell (1) is provided with a reaction cylinder (2), the upper part of the reaction cylinder (2) is provided with a spray plate (3), and the bottom of the spray plate (3) is provided with a plurality of evenly distributed spray holes; An ammonia water pipe (4) is connected to one side of the upper portion of the spray plate (3), and a circulation pipe (5) is connected to the other side of the upper portion of the spray plate (3); The ammonia water pipe (4) is provided with a high-pressure gas pipe (6), which is arranged outside the fluidized bed SNCR device housing (1), and the high-pressure gas pipe (6) is provided with a solenoid valve (7).

2. The anti-blocking ammonia injection device for a fluidized bed SNCR device according to claim 1, characterized in that: An exhaust pipe (8) is provided at the bottom of the side wall of the fluidized bed SNCR device shell (1), the end of the exhaust pipe (8) is connected to the bottom of the side wall of the reaction cylinder (2), and the exhaust pipe (8) arranged outside the fluidized bed SNCR device shell (1) is provided with a one-way gas valve (9); The upper opening of the reaction cylinder (2) is connected to a conical hopper (10), the large-diameter opening of the conical hopper (10) is arranged at the bottom of the spray plate (3), and the small-diameter opening of the conical hopper (10) is arranged at the upper part of the inner cavity of the reaction cylinder (2).

3. The anti-blocking ammonia injection device for a fluidized bed SNCR device according to claim 1, characterized in that: A motor (11) is provided at the bottom of the fluidized bed SNCR device housing (1), the motor (11) is connected to a rotating shaft (12), the rotating shaft (12) is arranged in the inner cavity of the reaction cylinder (2), a scraper A (13) is provided on the upper part of the rotating shaft (12), and the side wall of the scraper A (13) is arranged to fit the bottom of the spray plate (3).

4. The anti-blocking ammonia injection device for a fluidized bed SNCR device according to claim 3 is characterized in that: The middle portion of the side wall of the scraper A (13) is fixedly connected to the upper portion of the rotating shaft (12), and the length of the scraper A (13) is the same as the diameter of the spray plate (3).

5. The anti-blocking ammonia injection device for a fluidized bed SNCR device according to claim 3, characterized in that: The outer wall of the rotating shaft (12) is provided with a plurality of evenly distributed scrapers B (14), and the side walls of the scrapers B (14) are arranged to fit the inner wall of the reaction cylinder (2).

6. The anti-blocking ammonia injection device for a fluidized bed SNCR device according to claim 1, characterized in that: A circulating pump (15) is provided in communication with the bottom side wall of the fluidized bed SNCR device shell (1), and the circulating pump (15) is provided in communication with the circulating pipe (5).

7. The anti-blocking ammonia injection device for a fluidized bed SNCR device according to claim 1, characterized in that: An absorption chamber (16) is provided at the upper part of the inner cavity of the shell (1) of the fluidized bed SNCR device, a demisting chamber (17) is provided at the upper part of the absorption chamber (16), and an air outlet chamber (18) is provided at the upper part of the demisting chamber (17).

8. The anti-blocking ammonia injection device for a fluidized bed SNCR device according to claim 1, characterized in that: The reaction cylinder (2) is suspended in the inner cavity of the fluidized bed SNCR device housing (1) via a plurality of evenly distributed connecting plates (19).

Images