Boiler denitration system

Abstract

The utility model relates to a boiler denitration system which comprises a hearth. A smoke outlet of the hearth is connected with the denitration tower; the ammonia spraying mechanism is arranged on the denitration tower, and the ammonia spraying mechanism is used for spraying liquid ammonia into the denitration tower; the feeding mechanism is connected with the ammonia spraying mechanism through a conveying pipeline, and the feeding mechanism is used for providing liquid ammonia for the ammonia spraying mechanism; the adjusting mechanism is arranged on the conveying pipeline, and the adjusting mechanism is used for adjusting the opening degree of the conveying pipeline; the detection mechanism is used for detecting the concentration of nitric oxide in flue gas generated by the hearth; the detection mechanism is electrically connected with the control mechanism, the adjusting mechanism is electrically connected with the control mechanism, and the control mechanism is used for receiving and feeding back signals of the detection mechanism and controlling the adjusting mechanism to adjust the liquid ammonia conveying flow in the conveying pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler flue gas treatment, in particular to a boiler denitration system. Background Art

[0002] Flue gas is produced during boiler operation. The flue gas contains harmful substances such as sulfur dioxide, carbon monoxide and nitrogen oxides. If the flue gas is discharged directly into the atmosphere, it will pollute the air.

[0003] Currently, flue gas denitrification is carried out by spraying ammonia. Since the amount of ammonia sprayed by the spray gun is constant, when the flue gas volume is large, denitrification cannot be completely achieved, resulting in the presence of nitrogen oxides when the flue gas is discharged, causing air pollution; when the flue gas volume is small, the amount of ammonia escape is large, causing serious corrosion to the back-end equipment (such as: air preheater, etc.), reducing the service life of the back-end equipment (such as: air preheater, etc.). Utility Model Content

[0004] To this end, it is necessary to provide a boiler denitrification system to solve the technical problem that the amount of ammonia sprayed from the current spray gun is constant. When the flue gas volume is large, it cannot be completely denitrified, resulting in the presence of nitrogen oxides when the flue gas is discharged, causing air pollution; when the flue gas volume is small, the amount of ammonia escape is large, causing serious corrosion to the back-end equipment (such as: air preheater, etc.), reducing the service life of the back-end equipment (such as: air preheater, etc.).

[0005] To achieve the above objectives, the inventors provide a boiler denitration system, comprising:

[0006] furnace;

[0007] A denitration tower, wherein the smoke outlet of the furnace is connected to the denitration tower;

[0008] an ammonia spraying mechanism, the ammonia spraying mechanism being arranged on the denitration tower and being used for spraying liquid ammonia into the denitration tower;

[0009] a feeding mechanism, the feeding mechanism being connected to the ammonia spraying mechanism via a conveying pipeline, the feeding mechanism being used to provide liquid ammonia to the ammonia spraying mechanism;

[0010] An adjusting mechanism, the adjusting mechanism being provided on the delivery pipe and being used to adjust the opening size of the delivery pipe;

[0011] A detection mechanism, the detection mechanism is fixedly arranged and is used to detect the concentration of nitrogen oxides in the flue gas generated by the furnace;

[0012] The control mechanism is electrically connected to the detection mechanism, and the regulating mechanism is electrically connected to the control mechanism. The control mechanism is used to receive and feed back the signal of the detection mechanism and control the regulating mechanism to adjust the liquid ammonia delivery flow rate in the delivery pipeline.

[0013] As a preferred structure of the present invention, the boiler denitration system further comprises a desulfurization tower, the desulfurization tower is connected to the denitration tower via a pipeline, and the desulfurization tower is used to remove sulfur dioxide in the flue gas;

[0014] The detection mechanism is arranged on the smoke outlet pipe of the desulfurization tower; or the detection mechanism is arranged on the smoke inlet pipe of the denitrification tower.

[0015] As a preferred structure of the present invention, the feeding mechanism includes a urea solution storage tank, a first water pump, a desalted water storage tank, a dilution water pump, a mixer, a vaporizer and an air supply component;

[0016] The urea solution storage tank is connected to the mixer via a pipeline, and the first water pump is provided on the pipeline between the urea solution storage tank and the mixer;

[0017] The desalted water storage tank is connected to the mixer via a pipeline, and the dilution water pump is provided on the pipeline between the desalted water storage tank and the mixer;

[0018] The mixer is connected to the ammonia injection mechanism via the delivery pipeline;

[0019] The air supply component is connected to the ammonia injection mechanism through a pipeline.

[0020] As a preferred structure of the present invention, the feeding mechanism further includes a filtering component, and the filtering component is arranged on the conveying pipeline between the mixer and the regulating mechanism.

[0021] As a preferred structure of the present invention, the feeding mechanism further includes a check valve, which is arranged on the pipeline between the air supply component and the ammonia injection mechanism.

[0022] As a preferred structure of the present invention, the boiler denitration system further includes a urea storage bin, a conveying mechanism, a batching mechanism and a second water pump;

[0023] The conveying mechanism is arranged below the discharge port of the urea storage bin, and the batching mechanism is arranged on one side of the conveying mechanism, and the conveying mechanism is used to convey urea into the batching mechanism;

[0024] The desalted water storage tank is connected to the batching mechanism via a pipeline, and the batching mechanism is used to fully mix the desalted water and urea;

[0025] The dosing mechanism is connected to the urea solution storage tank through a pipeline, and the second water pump is arranged on the pipeline between the dosing mechanism and the urea solution storage tank.

[0026] As a preferred structure of the present invention, the batching mechanism includes a batching tank, a stirring component and a driving component. The driving component is fixedly arranged above the batching tank, the stirring component is arranged in the batching tank, and the driving component is transmission-connected to the stirring component.

[0027] As a preferred structure of the present invention, the boiler denitrification system also includes a feeding mechanism, which is arranged on one side of the urea storage bin and is connected to the feed port of the urea storage bin. The feeding mechanism is used to transport urea into the urea storage bin.

[0028] As a preferred structure of the present invention, the ammonia spraying mechanism includes a plurality of ammonia spraying guns, and the plurality of ammonia spraying guns are respectively arranged at intervals on the denitrification tower.

[0029] As a preferred structure of the present invention, the boiler denitrification system further includes an induced draft fan and a chimney. The desulfurization tower is connected to the chimney through a pipeline, and the induced draft fan is arranged on the pipeline between the desulfurization tower and the chimney.

[0030] Different from the prior art, the beneficial effects of the above technical solution are as follows: the boiler denitration system of the present invention provides liquid ammonia to the ammonia spraying mechanism in real time during operation through the feeding mechanism, and the ammonia spraying mechanism sprays liquid ammonia into the denitration tower. Liquid ammonia acts as a reducing agent and reacts with nitrogen oxides in the flue gas under the action of a catalyst to generate harmless nitrogen and water, thereby avoiding air pollution and improving environmental protection. The concentration of nitrogen oxides in the flue gas is detected in real time by a detection mechanism. When the concentration of nitrogen oxides in the flue gas is detected to be higher than a preset value, the detection mechanism sends a signal to the control mechanism. After receiving the signal, the control mechanism performs identification and processing. The control mechanism controls the regulating mechanism to increase the opening size of the conveying pipeline so that the ammonia spraying mechanism can spray more liquid ammonia to remove nitrogen oxides in the flue gas and avoid air pollution; when the concentration of nitrogen oxides in the flue gas is detected to be lower than the preset value, the detection mechanism sends a signal to the control mechanism. After the control mechanism receives the signal and performs identification processing, the control mechanism controls the regulating mechanism to reduce the opening size of the conveying pipeline so that the ammonia spraying mechanism can spray appropriate liquid ammonia, which can just remove nitrogen oxides in the flue gas, avoid the generation of excess liquid ammonia, and improve the service life of the back-end equipment (such as air preheater, etc.).

[0031] The above-mentioned records related to the content of the utility model are only an overview of the technical solution of this application. In order to enable ordinary technicians in this field to understand the technical solution of this application more clearly, and then implement it according to the text of the specification and the contents recorded in the drawings, and to make the above-mentioned purposes and other purposes, features and advantages of this application easier to understand, the following is an explanation in combination with the specific implementation methods and drawings of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of this application and other related contents, and are not to be considered as limiting this application.

[0033] In the drawings of the specification:

[0034] Figure 1 This is one of the flow diagrams of the boiler denitration system described in the specific implementation method;

[0035] Figure 2 This is the second flow diagram of the boiler denitration system described in the specific implementation method;

[0036] Figure 3 This is a schematic diagram of the feeding process of the boiler denitration system according to the specific embodiment;

[0037] Figure 4 A side view of the filter component according to the embodiment;

[0038] Figure 5 It is a circuit connection diagram of the boiler denitrification system feeding described in the specific implementation method.

[0039] The reference numerals in the above drawings are described as follows:

[0040] 1. Furnace,

[0041] 2. Denitrification tower,

[0042] 3. Ammonia spraying mechanism,

[0043] 4. Feeding mechanism,

[0044] 41. Urea solution storage tank,

[0045] 42. First water pump,

[0046] 43. Desalted water storage tank,

[0047] 44. Dilution water pump,

[0048] 45. Mixer,

[0049] 46. ​​Air supply components,

[0050] 47. Check valve,

[0051] 5. Transportation pipeline,

[0052] 51. Filter components,

[0053] 6. Adjustment mechanism,

[0054] 7. Testing agency,

[0055] 8. Control agency,

[0056] 9. Desulfurization tower,

[0057] 10. Urea storage silo,

[0058] 11. Conveying mechanism,

[0059] 12. Batching mechanism,

[0060] 121. Batching pool,

[0061] 122. stirring parts,

[0062] 123. Drive components,

[0063] 13. Second water pump,

[0064] 14. Feeding mechanism,

[0065] 15. Induced draft fan,

[0066] 16. Chimney. DETAILED DESCRIPTION

[0067] In order to explain in detail the possible application scenarios, technical principles, specific solutions that can be implemented, and the purpose and effects of this application, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application and are therefore only examples and are not intended to limit the scope of protection of this application.

[0068] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0069] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0070] In the description of this application, the term "and / or" is used to describe a logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0071] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, priority or sequence relationship between these entities or operations.

[0072] Without further limitations, in this application, the words "include", "comprise", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0073] Consistent with the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. Furthermore, in the description of the embodiments of this application, "multiple" means two or more (including two), and similar expressions related to "multiple," such as "multiple groups" and "multiple times," are also understood in this manner, unless otherwise specifically defined.

[0074] In the description of the embodiments of the present application, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also be indirectly connected to the other element "on" or "under" through an intermediate element.

[0075] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art of the present application, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0076] See also Figures 1 to 5 This embodiment relates to a boiler denitration system, wherein the boiler in this embodiment is a circulating fluidized bed boiler; specifically, the boiler denitration system includes:

[0077] Furnace 1;

[0078] A denitration tower 2, wherein the smoke outlet of the furnace 1 is connected to the denitration tower 2;

[0079] An ammonia injection mechanism 3 is provided on the denitrification tower 2 and is used for spraying liquid ammonia into the denitrification tower 2, wherein the sprayed liquid ammonia is used as a reducing agent to react with nitrogen oxides in the flue gas under the action of a catalyst to generate harmless nitrogen and water.

[0080] A feeding mechanism 4, wherein the feeding mechanism 4 is connected to the ammonia spraying mechanism 3 via a conveying pipe 5, and the feeding mechanism 4 is used to provide liquid ammonia to the ammonia spraying mechanism 3;

[0081] The regulating mechanism 6 is provided on the delivery pipe 5 and is used to adjust the opening size of the delivery pipe 5 ; wherein the regulating mechanism 6 in this embodiment is a flow proportional solenoid valve.

[0082] The detection mechanism 7 is fixedly arranged and is used to detect the concentration of nitrogen oxides in the flue gas generated by the furnace 1; wherein the detection mechanism 7 in this embodiment is a flue gas analyzer.

[0083] The control mechanism 8 is electrically connected to the detection mechanism 7 and the regulating mechanism 6. The control mechanism 8 is configured to receive and feed back signals from the detection mechanism 7 and control the regulating mechanism 6 to adjust the liquid ammonia delivery flow rate in the delivery pipeline 5. In this embodiment, the control mechanism 8 includes a PLC controller, a display screen, and an operation panel, and the display screen and the operation panel are electrically connected to the PLC controller.

[0084] Specifically, in the boiler denitration system of this embodiment, when in operation, liquid ammonia is provided to the ammonia spraying mechanism 3 in real time through the feeding mechanism 4, and the ammonia spraying mechanism 3 sprays liquid ammonia into the denitration tower 2. Liquid ammonia acts as a reducing agent and reacts with nitrogen oxides in the flue gas under the action of a catalyst to generate harmless nitrogen and water, thereby avoiding air pollution and improving environmental protection. The concentration of nitrogen oxides in the flue gas is detected in real time by the detection mechanism 7. When the concentration of nitrogen oxides in the flue gas is detected to be higher than a preset value, the detection mechanism 7 sends a signal to the control mechanism 8. After the control mechanism 8 receives the signal and performs identification processing, the control mechanism 8 controls the regulation. The regulating mechanism 6 increases the opening of the delivery pipe 5 so that the ammonia injection mechanism 3 can spray more liquid ammonia, thereby removing nitrogen oxides from the flue gas and preventing atmospheric pollution. When the concentration of nitrogen oxides in the flue gas is detected to be lower than a preset value, the detection mechanism 7 sends a signal to the control mechanism 8. After receiving the signal and performing identification processing, the control mechanism 8 controls the regulating mechanism 6 to decrease the opening of the delivery pipe 5 so that the ammonia injection mechanism 3 can spray an appropriate amount of liquid ammonia, which can just remove nitrogen oxides from the flue gas, avoid the production of excess liquid ammonia, and improve the service life of back-end equipment (such as the air preheater). It should be noted that the preset value in this embodiment can be adjusted according to actual conditions. In this embodiment, the preset value is 35mg / Nm³-40mg / Nm³.

[0085] Optionally, in some embodiments, Figure 1As shown, the boiler denitration system further includes a desulfurization tower 9, which is connected to the denitration tower 2 via a pipeline. The detection mechanism 7 is fixedly arranged on the smoke outlet pipe of the desulfurization tower 9. This arrangement is to ensure that the temperature of the smoke outlet pipe of the desulfurization tower 9 is relatively low, thereby avoiding damage to the detection mechanism 7 caused by high temperature, improving the accuracy of detection, and ensuring that the flue gas emissions meet environmental protection requirements and improve environmental protection; or in other embodiments, such as Figure 2 As shown, the detection mechanism 7 is fixedly arranged on the smoke inlet pipe of the denitrification tower 2. The desulfurization tower 9 is used to remove sulfur dioxide in the flue gas to avoid air pollution and improve environmental protection.

[0086] Optionally, in some embodiments, Figures 1 to 5 As shown, the feeding mechanism 4 includes a urea solution storage tank 41, a first water pump 42, a desalted water storage tank 43, a dilution water pump 44, a mixer 45 and an air supply component 46; the urea solution storage tank 41 is connected to the mixer 45 through a pipeline, and the first water pump 42 is arranged on the pipeline between the urea solution storage tank 41 and the mixer 45; the urea solution storage tank 41 is used to store urea solution, and the urea solution is transported to the mixer 45 for mixing with desalted water by the first water pump 42; the desalted water storage tank 43 is connected to the mixer 45 through a pipeline, and the dilution water pump 44 is arranged on the pipeline between the desalted water storage tank 43 and the mixer 45; the desalted water storage tank 43 is used to store desalted water, and the desalted water is transported to the mixer 45 for mixing with urea solution by the dilution water pump 44; the mixer 45 is connected to the ammonia injection mechanism 3 through the delivery pipeline; and the air supply component 46 is connected to the ammonia injection mechanism 3 through a pipeline. The air supply component 46 is an air compressor or a compressed air storage tank.

[0087] Optionally, in some embodiments, Figures 1 to 5 As shown, the feeding mechanism 4 further includes a filter component 51, which is disposed on the delivery pipe 5 between the mixer 45 and the regulating mechanism 6. The filter component 51 filters the liquid ammonia. In this embodiment, the filter component 51 is a filter mesh.

[0088] Optionally, in some embodiments, Figures 1 to 5 As shown, the feeding mechanism 4 further includes a check valve 47, which is disposed on the pipeline between the gas supply component 46 and the ammonia injection mechanism 3. The check valve 47 prevents the solution in the vaporizer from flowing back into the gas supply component 46. It should be noted that the structure of the feeding mechanism 4 of this embodiment is not limited to this, and those skilled in the art can select other suitable feeding mechanisms 4 based on the teachings of this embodiment.

[0089] Specifically, in this embodiment, Figures 1 to 5 As shown, the ammonia spraying mechanism 3 includes a plurality of ammonia spraying guns, which are respectively arranged at intervals on the denitrification tower. The plurality of ammonia spraying guns can fully remove nitrogen oxides in the flue gas.

[0090] Optionally, in some embodiments, Figures 1 to 5 As shown, the boiler denitration system also includes a urea storage bin 10, a conveying mechanism 11, a dosing mechanism 12, and a second water pump 13. The conveying mechanism 11 is disposed below the discharge port of the urea storage bin 10, and the dosing mechanism 12 is disposed on one side of the conveying mechanism 11. The conveying mechanism 11 is used to convey urea to the dosing mechanism 12. The urea storage bin lowers urea onto the conveying mechanism 11, which then delivers the urea to the dosing mechanism 12. The desalted water storage tank 43 is connected to the dosing mechanism 12 via a pipeline. The desalted water storage tank 43 conveys desalted water to the dosing mechanism 12, which is used to fully mix the desalted water with urea to produce a urea solution. The dosing mechanism 12 is connected to the urea solution storage tank 41 via a pipeline. The second water pump 13 is disposed in the pipeline between the dosing mechanism 12 and the urea solution storage tank 41. The second water pump 13 delivers the urea solution, after being fully stirred by the dosing mechanism 12, to the urea solution storage tank 41 for storage. In this embodiment, the delivery mechanism 11 is a conveyor belt or a chain conveyor.

[0091] Optionally, in some embodiments, Figures 1 to 5 As shown, the dosing mechanism 12 includes a dosing tank 121, a stirring component 122, and a driving component 123. The driving component 123 is fixedly disposed above the dosing tank 121, and the stirring component 122 is disposed within the dosing tank 121. The driving component 123 is in transmission connection with the stirring component 122. The driving component 123 drives the stirring component 122 to stir the desalted water and urea, thereby fully mixing the desalted water and urea to obtain a urea solution. The driving component 123 is a motor, and the stirring component 122 is a stirring plate.

[0092] Optionally, in some embodiments, Figures 1 to 5 As shown, the boiler denitration system further includes a feeding mechanism 14, which is disposed on one side of the urea storage bin 10 and is connected to the feed port of the urea storage bin 10. The feeding mechanism 14 is used to transport urea into the urea storage bin 10, which is easy to operate, saves time and effort, and improves work efficiency. The feeding mechanism 14 is a hoist.

[0093] Optionally, in some embodiments, Figures 1 to 5As shown, the boiler denitrification system also includes an induced draft fan 15 and a chimney 16. The desulfurization tower 9 is connected to the chimney 16 through a pipeline. The induced draft fan 15 is arranged on the pipeline between the desulfurization tower 9 and the chimney 16. After the flue gas passes through the denitrification tower 2 and the desulfurization tower 9 for denitrification and desulfurization, it is discharged from the chimney 16 through the induced draft fan 15, avoiding pollution to the atmosphere and improving environmental protection.

[0094] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concepts of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A boiler denitrification system, characterized in that: include: furnace; A denitration tower, wherein the smoke outlet of the furnace is connected to the denitration tower; an ammonia spraying mechanism, the ammonia spraying mechanism being arranged on the denitration tower and being used for spraying liquid ammonia into the denitration tower; a feeding mechanism, the feeding mechanism being connected to the ammonia spraying mechanism via a conveying pipeline, the feeding mechanism being used to provide liquid ammonia to the ammonia spraying mechanism; An adjusting mechanism, the adjusting mechanism being provided on the delivery pipe and being used to adjust the opening size of the delivery pipe; A detection mechanism, the detection mechanism is fixedly arranged and is used to detect the concentration of nitrogen oxides in the flue gas generated by the furnace; The control mechanism is electrically connected to the detection mechanism, and the regulating mechanism is electrically connected to the control mechanism. The control mechanism is used to receive and feed back the signal of the detection mechanism and control the regulating mechanism to adjust the liquid ammonia delivery flow rate in the delivery pipeline.

2. The boiler denitration system according to claim 1, characterized in that: The boiler denitration system further comprises a desulfurization tower, the desulfurization tower being connected to the denitration tower via a pipeline, and the desulfurization tower being used to remove sulfur dioxide from the flue gas; The detection mechanism is arranged on the smoke outlet pipe of the desulfurization tower; or the detection mechanism is arranged on the smoke inlet pipe of the denitrification tower.

3. The boiler denitration system according to claim 1 or 2, characterized in that: The feeding mechanism includes a urea solution storage tank, a first water pump, a desalted water storage tank, a dilution water pump, a mixer and an air supply component; The urea solution storage tank is connected to the mixer via a pipeline, and the first water pump is provided on the pipeline between the urea solution storage tank and the mixer; The desalted water storage tank is connected to the mixer via a pipeline, and the dilution water pump is provided on the pipeline between the desalted water storage tank and the mixer; The mixer is connected to the ammonia injection mechanism via the delivery pipeline; The air supply component is connected to the ammonia injection mechanism through a pipeline.

4. The boiler denitration system according to claim 3, characterized in that: The feeding mechanism further includes a filtering component, which is arranged on the conveying pipeline between the mixer and the regulating mechanism.

5. The boiler denitration system according to claim 3, characterized in that: The feeding mechanism further includes a check valve, which is arranged on the pipeline between the air supply component and the ammonia injection mechanism.

6. The boiler denitration system according to claim 3, characterized in that: The boiler denitration system further includes a urea storage bin, a conveying mechanism, a batching mechanism, and a second water pump; The conveying mechanism is arranged below the discharge port of the urea storage bin, and the batching mechanism is arranged on one side of the conveying mechanism, and the conveying mechanism is used to convey urea into the batching mechanism; The desalted water storage tank is connected to the batching mechanism via a pipeline, and the batching mechanism is used to fully mix the desalted water and urea; The dosing mechanism is connected to the urea solution storage tank through a pipeline, and the second water pump is arranged on the pipeline between the dosing mechanism and the urea solution storage tank.

7. The boiler denitration system according to claim 6, characterized in that: The batching mechanism includes a batching tank, a stirring component and a driving component. The driving component is fixedly arranged above the batching tank, the stirring component is arranged in the batching tank, and the driving component is transmission-connected to the stirring component.

8. The boiler denitration system according to claim 6, characterized in that: The boiler denitration system further includes a feeding mechanism, which is disposed on one side of the urea storage bin and is connected to a feed port of the urea storage bin. The feeding mechanism is used to transport urea into the urea storage bin.

9. The boiler denitration system according to claim 1, characterized in that: The ammonia spraying mechanism includes a plurality of ammonia spraying guns, and the plurality of ammonia spraying guns are respectively arranged at intervals on the denitration tower.

10. The boiler denitration system according to claim 2, characterized in that: The boiler denitration system further includes an induced draft fan and a chimney. The desulfurization tower is connected to the chimney through a pipeline. The induced draft fan is arranged on the pipeline between the desulfurization tower and the chimney.

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