Flue gas ammonia removal device and ammonia-doped combustion boiler

Abstract

The utility model discloses a flue gas ammonia removal device and an ammonia-doped combustion boiler. The flue gas ammonia removal device comprises an ammonia gas adsorption module which is used for allowing flue gas to pass through and adsorbing ammonia gas in the flue gas and comprises a receiving surface for receiving the flue gas; the frame comprises a bearing frame for bearing the ammonia gas adsorption module and a mounting part for mounting the flue gas ammonia removal device on an object to be mounted; and the size of the ammonia gas adsorption module along the passing direction of the flue gas passing through the ammonia gas adsorption module from the receiving surface is smaller than the size along the vertical direction perpendicular to the passing direction.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler combustion, and particularly relates to a flue gas ammonia removal device and an ammonia-doped combustion boiler. Background Art

[0002] Ammonia (NH 3 ) as a zero-carbon fuel and an efficient hydrogen storage medium is introduced into coal-fired units to replace part of the coal. By adding key equipment and systems for ammonia-doped combustion, the clean and efficient coupling combustion of ammonia and coal in the boiler can be realized, so as to achieve the purpose of reducing the carbon dioxide emissions of coal-fired units in the same proportion.

[0003] However, due to the high ignition temperature of ammonia, slow flame propagation speed, and poor combustion reaction activity of ammonia, there are technical problems such as difficult ignition, poor combustion stability, and incomplete combustion in ammonia combustion. Especially when a coal-fired boiler burns with a large proportion of ammonia doping, if the combustion control is improper, there is a risk that the amount of unburned ammonia exceeds the standard. Excessive residual ammonia flows through the tail flue with the flue gas and is then discharged, which will not only pollute the atmosphere secondly, but also increase the risk of air preheater blockage and exacerbate the low-temperature corrosion of the tail flue if high ammonia escape forms ammonium salt aerosol during the process of flue gas temperature reduction, causing equipment damage to the boiler tail. In addition, in extreme accident situations, such as very poor ammonia burnout and high ammonia escape, resulting in the accumulation of ammonia combustibles in the flue, there is a risk of secondary deflagration. Summary of the Invention

[0004] The purpose of the utility model is to provide a flue gas ammonia removal device capable of adsorbing ammonia in flue gas and an ammonia-doped combustion boiler applying the flue gas ammonia removal device.

[0005] The first aspect of the utility model discloses a flue gas ammonia removal device, including:

[0006] An ammonia adsorption module for receiving flue gas and adsorbing ammonia in the flue gas, including a receiving surface for receiving the flue gas;

[0007] A frame, including a carrier for carrying the ammonia adsorption module and a mounting part for mounting the flue gas ammonia removal device on an object to be mounted. The size of the ammonia adsorption module along the passing direction of the flue gas from the receiving surface through the ammonia adsorption module is smaller than the size along the vertical direction perpendicular to the passing direction.

[0008] In some embodiments, the ammonia adsorption module is a cuboid module, the height direction of the cuboid module is the passing direction, and the width direction of the cuboid module is the vertical direction.

[0009] In some embodiments, the ammonia adsorption module includes zeolite, and the zeolite is used for adsorbing ammonia in the flue gas.

[0010] In some embodiments, it further includes a filter plate for blocking dust in the flue gas before the flue gas enters the receiving surface. Along the passing direction, the filter plate is located upstream of the receiving surface.

[0011] In some embodiments, the filter plate is inclined with respect to the receiving surface.

[0012] In some embodiments, it further includes a plurality of support portions provided at opposite ends of the frame. The plurality of support portions support the filter plate, and the height of the support portion at one end of the opposite ends of the frame is greater than the height of the support portion at the other end.

[0013] In some embodiments, the mounting portion includes two rotating shafts located at opposite ends of the frame.

[0014] A second aspect of the present utility model discloses an ammonia-doped combustion boiler, including a furnace body and any one of the flue gas ammonia removal devices described above. The flue gas ammonia removal device is provided in the smoke exhaust passage of the furnace body.

[0015] In some embodiments, the flue gas ammonia removal device is rotatable relative to the furnace body. The flue gas ammonia removal device has a first position and a second position that can be rotated and switched. In the first position, the passing direction of the flue gas ammonia removal device is parallel to the flue gas flow direction of the smoke exhaust passage. In the second position, the passing direction of the flue gas ammonia removal device is perpendicular to the flue gas flow direction of the smoke exhaust passage.

[0016] In some embodiments, the furnace body includes a furnace chamber. The smoke exhaust passage includes a horizontal smoke exhaust passage located downstream of the furnace chamber along the flue gas flow direction and a vertical smoke exhaust passage located downstream of the horizontal smoke exhaust passage. The flue gas ammonia removal device is provided in the vertical smoke exhaust passage.

[0017] In some embodiments, it includes a plurality of flue gas ammonia removal devices arranged side by side in the horizontal direction. The mounting portion of the flue gas ammonia removal device includes two rotating shafts located at opposite ends of the frame. The rotating shafts of the plurality of flue gas ammonia removal devices are parallel and arranged along the horizontal direction.

[0018] In some embodiments, the flue gas ammonia removal device further includes a filter plate for blocking dust in the flue gas before the flue gas enters the receiving surface. Along the passing direction of the flue gas ammonia removal device, the filter plate is located upstream of the receiving surface. When the flue gas ammonia removal device is in the first position, the blocking surface of the filter plate of the flue gas ammonia removal device for blocking dust is inclined and not perpendicular to the vertical direction.

[0019] In some embodiments, it further includes a vibrator provided on the flue gas ammonia removal device for vibrating the filter plate and a controller signal-connected to the vibrator.

[0020] In some embodiments, it further includes a driving part for driving the flue gas ammonia removal device to rotate relative to the furnace body, a detection unit for detecting the ammonia concentration in the flue gas passage, and a controller signal - connected to the driving part and the detection unit. The controller is configured to control the action of the driving part according to the detection result of the detection unit.

[0021] Based on the flue gas ammonia removal device provided by the present utility model, by arranging an ammonia adsorption module on the bearing frame of the frame, ammonia in the flue gas can be adsorbed by the flue gas. At the same time, the size of the ammonia adsorption module along the passing direction of the flue gas passing through the ammonia adsorption module from the receiving surface is smaller than the size along the vertical direction perpendicular to the passing direction. When ammonia adsorption is not required, by adjusting the angle of the ammonia adsorption module, the resistance to the flow of the flue gas can be reduced.

[0022] Other features and advantages of the present utility model will become clear through the following detailed description of the exemplary embodiments of the present utility model with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present utility model and constitute a part of this application. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0024] Figure 1 is a schematic structural diagram of the flue gas ammonia removal device according to an embodiment of the present utility model;

[0025] Figure 2 is Figure 1 a cross - sectional structural diagram of the flue gas ammonia removal device shown;

[0026] Figure 3 is a schematic structural principle diagram of an ammonia - doped combustion boiler according to an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation to the present utility model and its application or use. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that for the sake of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof in subsequent drawings is not necessary.

[0029] In the description of the present utility model, it should be understood that the use of terms such as "first" and "second" to define components is only for the convenience of differentiating the corresponding components. Without further statement, the above terms have no special meaning, and thus, should not be construed as limiting the protection scope of the present utility model.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium. 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.

[0031] For the sake of description, spatial relative terms such as "above", "on top of", "on the upper surface", "above-mentioned", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "on top of other devices or structures" will then be positioned "below other devices or structures" or "beneath other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0032] Such as Figure 1 and Figure 2As shown, the flue gas ammonia removal device 1 of this embodiment is used for removing ammonia from flue gas. The flue gas ammonia removal device 1 includes an ammonia adsorption module 11 and a frame.

[0033] The ammonia adsorption module 11 is used for adsorbing ammonia in the flue gas through the flue gas. The ammonia adsorption module 11 includes a receiving surface for receiving the flue gas.

[0034] The frame includes a carrier 12 for carrying the ammonia adsorption module 11 and an installation part 13 for installing the flue gas ammonia removal device 1 onto an object to be installed. The dimension of the ammonia adsorption module 11 along the passing direction of the flue gas from the receiving surface through the ammonia adsorption module 11 is smaller than the dimension along the vertical direction perpendicular to the passing direction. In Figure 1 and Figure 2 In the shown embodiment, the carrier 12 is a frame-shaped carrier. As Figure 2 shown, its outer contour is in the shape of a cuboid, but the six faces of the cuboid are all hollow. The installation part is used to connect with an object to be installed, such as a boiler, etc., to install the flue gas ammonia removal device 1 onto the object to be installed. In Figure 2 In the shown embodiment, the frame further includes two cover plates 16 located at both ends of the carrier. The installation part is arranged on the cover plates. By opening the cover plates, the replacement of the ammonia adsorption module 11 can be realized.

[0035] As Figure 2 shown, the y direction is the passing direction of the ammonia adsorption module 11. The receiving surface of the ammonia adsorption module 11 is the upper surface in Figure 2 . When the flue gas passes through the ammonia adsorption module 11, it first contacts the receiving surface and enters the ammonia adsorption module 11 from the receiving surface. The dimension of the ammonia adsorption module 11 along the passing direction of the flue gas from the receiving surface through the ammonia adsorption module 11 is the maximum contour dimension of the outline of the ammonia adsorption module 11 along the y direction in Figure 2 . The dimension of the ammonia adsorption module 11 along the vertical direction perpendicular to the passing direction is the maximum contour dimension of the outline of the ammonia adsorption module 11 along a certain vertical direction. In Figure 2 In the embodiment, the x direction is one of the vertical directions perpendicular to the passing direction. The dimension of the ammonia adsorption module 11 along the x direction is also the maximum dimension of the outline of the ammonia adsorption module 11 along the x direction.

[0036] The ammonia removal device 1 of this embodiment uses the carrier 12 of the frame to carry the ammonia adsorption module 11, so that ammonia in the flue gas can be adsorbed by the flue gas. At the same time, the dimension of the ammonia adsorption module 11 along the passing direction of the flue gas through the ammonia adsorption module 11 from the receiving surface is smaller than the dimension along the vertical direction perpendicular to the passing direction. When it is necessary to adsorb chlorine, the passing direction of the ammonia adsorption module 11 can be parallel to the flue gas flow direction, so that the cross-sectional area covered by the ammonia adsorption module 11 in the flue gas flow channel is larger, and more flue gas can enter the ammonia adsorption module 11. When it is not necessary to adsorb ammonia, by adjusting the angle of the ammonia adsorption module 11, the cross-sectional area covered by the ammonia adsorption module 11 in the flue gas flow channel can be reduced, and the resistance to flue gas flow can be reduced.

[0037] In some embodiments, such as Figure 2 shown, the ammonia adsorption module 11 is a cuboid module. In Figure 2 , the height direction of the cuboid module, that is, the y direction, is the passing direction, and the width direction of the cuboid module, that is, the x direction, is the vertical direction. That is, in this embodiment, the vertical direction is defined as the x direction.

[0038] In some embodiments, the ammonia adsorption module 11 includes zeolite, which is used to adsorb ammonia in the flue gas. Due to the large number of cavities and channels in its crystal lattice, the huge internal surface area is the basis for the high adsorption efficiency of zeolite. Moreover, zeolite has good thermal stability and is a high-temperature adsorbent (500°C - 850°C). Zeolite can be divided into natural zeolite and synthetic zeolite. There are up to one or two hundred kinds of synthetic zeolite, and one of them is fly ash synthetic zeolite, which is one of the ways to effectively utilize resources. The process is simple, with low energy consumption, high synthesis yield and no three wastes pollution. The utilization of zeolite provides a way for the comprehensive utilization of fly ash in coal-fired power plants. In terms of zeolite performance, different from general commonly used solid adsorbents, it has two significant characteristics, namely the selective adsorption and high-efficiency adsorption of zeolite. Some studies have shown that the saturated adsorption capacity of zeolite for ammonia is 0.13 mg / g, and the adsorption effect is most obvious when the water content is 40%. The research of Jilin University's "Research on the Treatment of Ammonia by Modified Zeolite Adsorbent" studied the adsorption effect of modified zeolite on ammonia and found that the adsorption effect of metal chloride-impregnated modified zeolite on ammonia is 7 times higher than that of the original zeolite; the adsorption effect of humidified zeolite is about 7 times higher than that of dry zeolite. Based on the above adsorption effect of zeolite on ammonia, this embodiment mainly uses zeolite or modified zeolite as the ammonia adsorption material, and realizes the adsorption and capture of ammonia by designing the adsorption module.

[0039] In some embodiments, such as Figure 1 and Figure 2As shown, the flue gas ammonia removal device 1 further includes a filter plate 14 for blocking dust in the flue gas before the flue gas enters the receiving surface. Along the passing direction, the filter plate 14 is located upstream of the receiving surface. The filter plate is provided with a plurality of filter holes, and the aperture of the filter holes is configured to be able to pass small molecule gases in the flue gas, such as ammonia, carbon dioxide, nitrogen and other gases, but not to pass larger particles such as dust, so as to protect the ammonia adsorption module 11.

[0040] In some embodiments, as Figure 2 shown, the filter plate 14 is inclined relative to the receiving surface. The filter plate 14 is inclined relative to the receiving surface, that is, the filter plate 14 is not perpendicular to the passing direction, which helps the dust blocked by the filter plate 14 to move along the surface of the filter plate 14 to one side to be collected or carried away by the flue gas.

[0041] In some embodiments, as Figure 1 and Figure 2 shown, the flue gas ammonia removal device 1 further includes a plurality of support parts 15 provided at opposite ends of the frame. The plurality of support parts 15 support the filter plate 14, and the height of the support part 15 at one end of the opposite ends of the frame is greater than the height of the support part 15 at the other end.

[0042] In some embodiments, the mounting part 13 includes two rotating shafts located at opposite ends of the frame. The arrangement of the rotating shafts can rotatably mount the flue gas ammonia removal device 1 on an object.

[0043] In some embodiments, an ammonia-doped combustion boiler is also disclosed. As Figure 2 shown, the ammonia-doped combustion boiler includes a furnace body and any one of the above-mentioned flue gas ammonia removal devices 1. The flue gas ammonia removal device 1 is arranged in the smoke exhaust passage of the furnace body. When the ammonia-coal mixed fuel in the ammonia-doped combustion boiler burns in the furnace and due to improper control or abnormal working conditions, it causes flue gas containing a certain amount of unburned ammonia to flow out of the furnace. The flue gas ammonia removal device 1 can adsorb ammonia in the flue gas.

[0044] In some embodiments, as Figure 3 shown, the flue gas ammonia removal device 1 is rotatable relative to the furnace body. The flue gas ammonia removal device 1 has a first position and a second position that can be rotated and switched. In the first position, as Figure 3 shown, the passing direction of the flue gas ammonia removal device 1 is parallel to the flue gas flow direction of the smoke exhaust passage, and can effectively adsorb ammonia in the flue gas. In the second position, the passing direction of the flue gas ammonia removal device 1 is perpendicular to the flue gas flow direction of the smoke exhaust passage (that is, Figure 3 shown, the flue gas ammonia removal device 1 rotates 90 degrees relative to the furnace body). The ammonia removal effect of the flue gas ammonia removal device 1 is poor, but it can reduce the resistance to the flow of flue gas in the smoke exhaust passage.

[0045] In some embodiments, asFigure 3 As shown, the furnace body includes a furnace chamber 21. The smoke exhaust passage includes a horizontal smoke exhaust passage 22 located downstream of the furnace chamber along the smoke flow direction and a vertical smoke exhaust passage 23 located downstream of the horizontal smoke exhaust passage. The flue gas deammoniation device 1 is disposed in the vertical smoke exhaust passage 23. Figure 3 The arrow in the furnace body indicates the smoke flow direction. The ammonia adsorption module 1 is placed in the vertical smoke exhaust passage 23, specifically, it can be in front of or behind the economizer in the tail flue of the boiler. The flue gas temperature at this position is within the temperature resistance range of zeolite for ammonia adsorption, and the residual ammonia can be adsorbed in front of the air preheater at this position, reducing the risk of blockage of the air preheater by residual ammonia and the low-temperature corrosion of the tail flue, and minimizing the equipment damage to the boiler tail.

[0046] In some embodiments, as Figure 3 shown, the ammonia-fired combustion boiler includes a plurality of flue gas deammoniation devices 1 arranged in parallel in the horizontal direction. The installation part 13 of the flue gas deammoniation device 1 includes two rotating shafts located at opposite ends of the frame. The rotating shafts of the plurality of flue gas deammoniation devices 1 are parallel and arranged along the horizontal direction. By rotating the flue gas deammoniation device 1, an effective switching between the first position and the second position of the flue gas deammoniation device 1 can be achieved, thereby effectively removing ammonia from the flue gas in the vertical smoke exhaust passage 23 or reducing the resistance to flue gas flow when ammonia removal is not required. At the same time, when the flue gas deammoniation device 1 is working in the first position, the dust blocked by the filter plate 14 can move along the surface of the filter plate 14 to the gap between adjacent flue gas deammoniation devices 1 and be carried away by the flue gas.

[0047] In some embodiments, the flue gas deammoniation device 1 further includes a filter plate 14 for blocking the dust in the flue gas before the flue gas enters the receiving surface. Along the passing direction of the flue gas deammoniation device 1, the filter plate 14 is located upstream of the receiving surface. When the flue gas deammoniation device 1 is in the first position, the blocking surface of the filter plate 14 of the flue gas deammoniation device 1 for blocking dust is inclined and not perpendicular to the vertical direction.

[0048] In some embodiments, the ammonia-fired combustion boiler further includes a vibrator for vibrating the filter plate 14 disposed on the flue gas deammoniation device 1 and a controller 27 signal-connected to the vibrator. The vibrator includes an ultrasonic vibrator. Setting the vibrator to increase the vibration of the filter plate to accelerate the concentration of the dust on the inclined filter plate to one side of the filter plate 14 for treatment.

[0049] In some embodiments, the ammonia-doped combustion boiler further includes a driving part for driving the flue gas ammonia removal device 1 to rotate relative to the furnace body, a detection unit 24 for detecting the ammonia concentration in the flue gas passage, and a controller 27 that is signal-connected to the driving part and the detection unit 24. The controller 27 is configured to control the operation of the driving part according to the detection result of the detection unit. The detection unit includes instrument components such as an ammonia detector that can detect the ammonia concentration. The driving part includes components such as a gear and a driving motor that are drivingly connected to the rotating shaft of the flue gas ammonia removal device 1. In the embodiment shown in the figure, the detection unit 24 includes a first detection unit located upstream of the flue gas ammonia removal device 1 and a second detection unit located downstream along the flue gas flow direction. The ammonia-doped combustion boiler further includes a first signal collector 25 signal-connected between the first detection unit and the controller and a second signal collector 26 signal-connected between the second detection unit and the controller. The first signal collector 25 and the second signal collector 26 respectively transmit the detection results of the first detection unit and the second detection unit to the controller. For example, when the first detection unit detects that the ammonia concentration in the flue gas is less than the first preset value of 3 ppm, the controller controls the driving part to drive the flue gas ammonia removal device 1 to the second position; when it is detected that the ammonia concentration in the flue gas is greater than the first preset value of 3 ppm, the controller controls the driving part to drive the flue gas ammonia removal device 1 to the first position. At this time, the flue gas sequentially flows through the filter plate 15 and the zeolite adsorption core of the flue gas ammonia removal device 1. The zeolite adsorption core is artificially processed into a honeycomb shape from zeolite or modified zeolite to increase the contact area between the flue gas and the zeolite and improve the adsorption performance. Additionally, in extreme cases, when it is detected that the ammonia concentration in the flue gas is much greater than the preset value of 3 ppm, the ammonia supply valve of the boiler can be closed simultaneously to cut off the ammonia fuel supply.

[0050] The flue gas adsorbed by the flue gas ammonia removal device 1 is on-line monitored by the second detection unit to further determine whether the ammonia concentration in the flue gas is greater than the preset value of 3 ppm. When the ammonia concentration is greater than the preset value of 3 ppm, it indicates that the zeolite adsorption core has reached the saturation limit of ammonia adsorption and needs to be replaced through the zeolite adsorption core.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A flue gas ammonia removal device, characterized in that: include: an ammonia adsorption module for passing the flue gas and adsorbing ammonia in the flue gas, including a receiving surface for receiving the flue gas; The frame includes a support frame for supporting the ammonia adsorption module and a mounting portion for mounting the flue gas ammonia removal device on an object to be installed. The dimension of the ammonia adsorption module along the passage direction of the flue gas from the facing surface through the ammonia adsorption module is smaller than the dimension along the vertical direction perpendicular to the passage direction.

2. The flue gas ammonia removal device according to claim 1, characterized in that: The ammonia adsorption module is a rectangular parallelepiped module, the height direction of the rectangular parallelepiped module is the passing direction, and the width direction of the rectangular parallelepiped module is the vertical direction.

3. The flue gas ammonia removal device according to claim 1, characterized in that: The ammonia adsorption module comprises zeolite, and the zeolite is used for adsorbing ammonia in flue gas.

4. The flue gas ammonia removal device according to claim 1, characterized in that: It also includes a filter plate for blocking dust in the smoke before the smoke enters the facing surface. Along the passing direction, the filter plate is located upstream of the facing surface.

5. The flue gas ammonia removal device according to claim 4, characterized in that: The filter plate is arranged obliquely relative to the facing surface.

6. The flue gas ammonia removal device according to claim 4, characterized in that: It also includes a plurality of support parts arranged at opposite ends of the frame, the plurality of support parts support the filter plate, and the height of the support part at one of the opposite ends of the frame is greater than the height of the support part at the other end.

7. The flue gas ammonia removal device according to claim 1, characterized in that: The mounting portion includes two rotating shafts located at opposite ends of the frame.

8. An ammonia-blended combustion boiler, characterized in that: It comprises a furnace body and a flue gas ammonia removal device as claimed in any one of claims 1 to 7, wherein the flue gas ammonia removal device is arranged in a smoke exhaust channel of the furnace body.

9. The ammonia-blended combustion boiler according to claim 8, characterized in that: The flue gas ammonia removal device is rotatable relative to the furnace body, and has a first position and a second position that can be rotatably switched. In the first position, the passing direction of the flue gas ammonia removal device is parallel to the flue gas flow direction of the exhaust channel. In the second position, the passing direction of the flue gas ammonia removal device is parallel and perpendicular to the flue gas flow direction of the exhaust channel.

10. The ammonia-blended combustion boiler according to claim 9, characterized in that: The furnace body comprises a furnace, the smoke exhaust channel comprises a horizontal smoke exhaust channel located downstream of the furnace along the smoke flow direction and a vertical smoke exhaust channel located downstream of the horizontal smoke exhaust channel, and the smoke ammonia removal device is arranged in the vertical smoke exhaust channel.

11. The ammonia-blended combustion boiler according to claim 10, characterized in that: It comprises a plurality of flue gas ammonia removal devices arranged in parallel in the horizontal direction, wherein the mounting parts of the flue gas ammonia removal devices comprise two rotating shafts located at opposite ends of the frame, and the rotating shafts of the plurality of flue gas ammonia removal devices are arranged in parallel and in the horizontal direction.

12. The ammonia-blended combustion boiler according to claim 11, characterized in that: The flue gas ammonia removal device also includes a filter plate for blocking dust in the flue gas before the flue gas enters the facing surface. Along the passing direction of the flue gas ammonia removal device, the filter plate is located upstream of the facing surface. When the flue gas ammonia removal device is in the first position, the blocking surface of the filter plate of the flue gas ammonia removal device for blocking dust is tilted and not perpendicular to the vertical direction.

13. The ammonia-blended combustion boiler according to claim 12, characterized in that: It also includes a vibrator arranged on the flue gas ammonia removal device for vibrating the filter plate and a controller connected to the vibrator signal.

14. The ammonia-blended combustion boiler according to claim 10, characterized in that: It also includes a driving unit for driving the flue gas ammonia removal device to rotate relative to the furnace body, a detection unit for detecting the ammonia concentration in the smoke exhaust channel, and a controller connected to the driving unit and the detection unit signal, and the controller is configured to control the action of the driving unit according to the detection result of the detection unit.

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