Flue gas full-load SCR denitration intelligent adjusting and optimizing device

Abstract

The invention belongs to the technical field of flue gas purification, and particularly discloses a flue gas full-load SCR denitration intelligent adjusting and optimizing device which comprises a flue gas uniform distributor, a gas ammonia uniform distributor and an ammonia flue gas mixer. The flue gas uniform distributor is installed in a flue and composed of a fixed plate and a movable plate, throttling holes are formed in the fixed plate and the movable plate, the overlapping amount of the throttling holes is changed by adjusting the position of the movable plate, and flue gas distribution adjustment is achieved. The ammonia gas uniform distributor is positioned behind the flue gas uniform distributor and consists of a ammonia gas pipeline, a fixed part and a movable part, the ammonia gas pipeline is provided with a first gas hole, the fixed part covers the ammonia gas pipeline and is provided with a second gas hole, the movable part is provided with a third gas hole, and the position of the movable part is adjusted to change the overlapping amount of the gas holes so as to realize ammonia gas distribution adjustment. And the ammonia flue gas mixer is arranged behind the gas ammonia uniform distributor and is used for mixing flue gas and ammonia gas, so that the denitration efficiency is improved. The device can realize uniform distribution of flue gas under a full-load working condition and accurate and uniform distribution of ammonia gas, improves the denitration efficiency, ensures ultralow emission of nitrogen oxides, and strictly controls ammonia escape.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas purification, and in particular to a flue gas full-load SCR denitration intelligent tuning device. Background Art

[0002] With the rapid development of my country's industry, the flue gas emissions from coal-fired power plants have attracted increasing attention. X ) is one of the main air pollutants, and its emission reduction has always been the focus of the environmental protection field. Selective catalytic reduction (SCR) denitrification technology has become the mainstream technology for flue gas denitrification in coal-fired power plants due to its high efficiency and mature characteristics. After more than 20 years of development, my country's industrial coal-fired flue gas SCR denitrification technology has been able to achieve ultra-low emissions or even ultra-low emissions under full load design conditions, while effectively controlling ammonia escape from exceeding the standard.

[0003] However, in recent years, with the rapid development of clean and renewable energy such as wind power and solar power, the operation mode of traditional coal-fired power generation has changed significantly. Coal-fired power plants have gradually transformed into peak-shaving power plants, which only operate at full load when clean and renewable energy power generation is insufficient. In most cases, peak-shaving power plants are operating at low load or ultra-low load. This change in operation mode has brought new challenges to SCR denitrification technology.

[0004] When operating at low or ultra-low load, the flue gas conditions seriously deviate from the design conditions. Specifically, the flue gas flow field is turbulent and the gas and ammonia are unevenly distributed, resulting in flue gas deviation and ammonia distribution deviation in local locations of the flue. These problems ultimately affect the denitrification efficiency, making it difficult for nitrogen oxide emissions to meet the standards, and ammonia escape is also likely to exceed the standards. This not only poses potential hazards to the environment, but also affects the normal operation and economic benefits of the power plant.

[0005] In order to solve the above problems, a solution of zoned ammonia injection is adopted in the prior art. This solution divides the ammonia injection pipeline into multiple zones, controls the ammonia injection amount of each zone by regulating valves, and installs multiple CEMS (continuous emission monitoring system) measuring devices in different zones on the reactor after denitrification. According to the nitrogen oxides NO measured by CEMS in each zone, X The concentration is adjusted by adjusting the ammonia regulating valve in the corresponding area. However, this solution has obvious shortcomings. First, it does not effectively rectify the flue gas during low load and ultra-low load operation, and cannot solve the problem of flue gas deviation. Secondly, the uniformity of ammonia distribution cannot be accurately controlled and can only be roughly adjusted. When the unit is operating at ultra-low load, its adjustment ability is obviously insufficient. In addition, installing a large number of CEMS measuring devices at the reactor outlet is not only costly, but also not conducive to the long-term stable operation of the system.

[0006] Therefore, it is necessary to propose a flue gas full-load SCR denitrification intelligent tuning device to solve the above problems. Summary of the invention

[0007] In view of the above-mentioned problems existing in the prior art, the present invention aims to provide a flue gas full-load SCR denitrification intelligent tuning device to solve the problems of low denitrification efficiency during low load and ultra-low load operation, excessive ammonia escape, limited adjustment capacity of the prior art, and high cost.

[0008] To achieve the above object, the present invention provides the following solution: a flue gas full-load SCR denitrification intelligent tuning device, comprising:

[0009] A smoke distributor is installed in the flue, and includes a smoke distributor fixed plate and a smoke distributor movable plate, both of which are provided with throttling holes, and the overlap amount of the throttling holes is changed by adjusting the position of the smoke distributor movable plate, thereby adjusting the distribution of the smoke;

[0010] The ammonia gas distributor is installed in the flue behind the flue gas distributor, and comprises an ammonia gas pipeline, an ammonia gas distributor fixing part and an ammonia gas distributor movable part; the ammonia gas pipeline is provided with a first air hole; the ammonia gas distributor fixing part is fixedly connected to the ammonia gas pipeline and covers the first air hole, and a second air hole is provided thereon; the ammonia gas distributor movable part is movably connected above the ammonia gas distributor fixing part, and a third air hole is provided thereon; the overlap amount of the second air hole and the third air hole is changed by adjusting the position of the ammonia gas distributor movable part, so as to adjust the distribution of ammonia gas;

[0011] The ammonia flue gas mixer is installed in the flue behind the gas-ammonia distributor and is used for mixing the flue gas and ammonia.

[0012] In some optional solutions of the present invention, the throttling holes on the fixed plate of the smoke distributor and the movable plate of the smoke distributor are evenly distributed, and the diameters and hole spacings of the throttling holes are the same.

[0013] In some optional schemes of the present invention, the smoke distributor also includes a smoke distributor actuator, which is arranged outside the flue, and its driving shaft extends into the flue and is connected to the smoke distributor movable plate, so as to drive the smoke distributor movable plate to reciprocate in a direction perpendicular to the flue.

[0014] In some optional schemes of the present invention, the gas-ammonia distributor fixing part is a right-angle plate covering the gas-ammonia pipeline, and the second air holes on its two plate surfaces are symmetrically distributed. The gas-ammonia distributor movable part has the same shape as the gas-ammonia distributor fixing part, and the third air holes thereon correspond one-to-one with the second air holes.

[0015] In some optional schemes of the present invention, the number of the second pores is equal to the number of the first pores, and the aperture of the second pores is half of that of the first pores.

[0016] In some optional solutions of the present invention, the movable part of the gas-ammonia distributor slides above the fixed part of the gas-ammonia distributor in a direction perpendicular to the flue, and a second sealing gasket is provided between the two.

[0017] In some optional solutions of the present invention, an airflow duct is fixedly connected to the outer side of the third air hole of the movable part of the gas-ammonia distributor, and the inner diameter of the airflow duct is the same as the aperture of the third air hole, which is used to guide the direction of the airflow.

[0018] In some optional solutions of the present invention, a disturbing body is provided at the outlet of the airflow duct, and the disturbing body is a reduced diameter tube body, which smoothly transitions with the inner wall of the airflow duct to form a Venturi effect and increase the airflow intensity.

[0019] In some optional schemes of the present invention, the gas-ammonia distributor also includes a gas-ammonia distributor actuator, which is arranged outside the flue, and its driving shaft extends into the flue and is connected to the gas-ammonia distributor movable part, so as to drive the gas-ammonia distributor movable part to reciprocate in a direction perpendicular to the flue.

[0020] In some optional schemes of the present invention, the ammonia flue gas mixer adopts a two-way flow guide plate to fully mix the flue gas and ammonia after being treated by the flue gas distributor and the gas-ammonia distributor.

[0021] Through innovative device design and intelligent adjustment mechanism, the invention can achieve uniform distribution of flue gas under full load conditions and precise distribution of ammonia, thereby improving denitrification efficiency and ensuring ultra-low emissions of nitrogen oxides. At the same time, it strictly controls ammonia escape, providing a more efficient, economical and stable solution for the environmentally friendly operation of coal-fired power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a structural schematic diagram of the intelligent optimization device for full-load SCR denitration of flue gas according to the present invention;

[0024] Figure 2 It is a structural schematic diagram of the smoke distributor in the device of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the gas-ammonia distributor in the device of the present invention;

[0026] Figure 4 is a cross-sectional view of an ammonia flue gas mixer in the device of the present invention;

[0027] Figure 5 The figure is a schematic diagram of the matching relationship between the throttle holes on the fixed plate and the movable plate of the smoke distributor in the device of the present invention.

[0028] In the figure: 1. Smoke distributor; 11. Smoke distributor fixing plate; 110. Throttle hole; 12. Smoke distributor movable plate; 13. Smoke distributor actuator; 2. Gas-ammonia distributor; 21. Gas-ammonia pipeline; 211. First air hole; 22. Gas-ammonia distributor fixing piece; 221. Second air hole; 23. Gas-ammonia distributor movable piece; 231. Third air hole; 24. Gas-ammonia distributor actuator; 25. First sealing gasket; 26. Second sealing gasket; 27. Airflow duct; 28. Turbine body; 3. Ammonia smoke mixer. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figures 1 to 5 As shown, an embodiment of the present invention provides a flue gas full-load SCR denitrification intelligent tuning device, including a flue gas distributor 1, a gas-ammonia distributor 2 and an ammonia-flue gas mixer 3.

[0032] Specifically, Figure 2 and Figure 5As shown, the smoke distributor 1 includes a smoke distributor body and a smoke distributor actuator 13. The smoke distributor body is fixedly installed in the flue, and a smoke distributor fixed plate 11 is fixedly connected thereto, and a smoke distributor movable plate 12 is slidably connected thereto. The smoke distributor actuator 13 is arranged outside the flue, and its driving shaft penetrates into the flue and is connected to the smoke distributor movable plate 12 to drive the smoke distributor movable plate 12 to reciprocate along the direction perpendicular to the flue. The smoke distributor fixed plate 11 and the smoke distributor movable plate 12 are both provided with a plurality of throttling holes 110 with the same diameter and the same hole spacing. It should be understood that the plurality of throttling holes 110 are evenly distributed on the smoke distributor fixed plate 11 and the smoke distributor movable plate 12.

[0033] Under different loads, according to the smoke flow rate, the smoke distributor actuator 13 automatically adjusts the position of the smoke distributor movable plate 12 to adjust the overlap between the smoke distributor movable plate 12 and the throttle hole 110 on the smoke distributor fixed plate 11. In this way, the flow rate of the throttle hole 110 can be stabilized, so as to achieve uniform distribution of smoke on the flue cross section. This local throttling design can effectively increase the flow rate of gas passing through the throttle hole 110, achieving the effect of regional smoke distribution.

[0034] Specifically, Figure 2 and Figure 4 As shown, the gas-ammonia distributor 2 includes a gas-ammonia pipeline 21, a gas-ammonia distributor fixing part 22, a gas-ammonia distributor movable part 23 and a gas-ammonia distributor actuator 24. The gas-ammonia pipeline 21 is installed in the flue behind the flue gas distributor 1, and one end of the gas-ammonia pipeline 21 extends out of the flue and is connected to a gas source (not shown in the figure). Furthermore, the gas-ammonia pipeline 21 is a circular straight pipe, on which a plurality of first air holes 211 are evenly distributed along the length direction. The gas-ammonia pipeline 21 is also fixedly connected to the gas-ammonia distributor fixing part 22. The gas-ammonia distributor fixing part 22 is a right-angle plate, which covers directly above the first air hole 211 and is sealed and connected to the gas-ammonia pipeline 21 through a first sealing gasket 25. A plurality of second air holes 221 of equal number and equal diameter are equidistantly provided on the two plate surfaces of the gas-ammonia distributor fixing part 22 along the length direction. Preferably, the number of the second air holes 221 is equal to the number of the first air holes 211, and the aperture of the second air holes 221 is half of the first air holes 211. The gas-ammonia distributor movable part 23 is slidably connected above the gas-ammonia distributor fixing part 22. The gas-ammonia distributor movable part 23 is also a right-angle plate, on which are provided third air holes 231 corresponding to the second air holes 221 on the gas-ammonia distributor fixing part 22, and the aperture of the third air holes 231 is equal to the second air holes 221. The gas-ammonia distributor movable part 23 is connected to the gas-ammonia distributor actuator 24 fixedly connected to the outside of the flue, and reciprocates under the drive of the gas-ammonia distributor actuator 24.

[0035] Under different loads, according to the flue gas flow rate and nitrogen oxides NO X The gas ammonia distributor actuator 24 automatically adjusts the position of the gas ammonia distributor movable part 23, so that the overlap between the third air hole 231 on the gas ammonia distributor movable part 23 and the second air hole 221 on the gas ammonia distributor fixed part 22 changes, thereby stabilizing the gas flow rate and achieving uniform distribution of the ammonia spray amount on the flue cross section. This design can accurately adjust the distribution of ammonia according to actual working conditions, avoiding the problem of reduced denitration efficiency and excessive ammonia escape caused by uneven distribution of ammonia.

[0036] A further optimization scheme is that a second sealing gasket 26 is provided between the movable part 23 of the gas-ammonia distributor and the fixed part 22 of the gas-ammonia distributor, one side of the second sealing gasket 26 is bonded to the fixed part 22 of the gas-ammonia distributor or the movable part 23 of the gas-ammonia distributor, and the other side is in sliding contact with the movable part 23 of the gas-ammonia distributor or the fixed part 22 of the gas-ammonia distributor, thereby improving the airtightness without affecting the sliding fit between the movable part 23 of the gas-ammonia distributor and the fixed part 22 of the gas-ammonia distributor.

[0037] As a further optimization scheme, an air flow duct 27 is fixedly connected to the outer side of the third air hole 231 of the movable part 23 of the gas-ammonia distributor, and the inner diameter of the air flow duct 27 is the same as the aperture of the third air hole 231 to guide the direction of the air flow.

[0038] A further optimized solution is that a disturbing body 28 is provided at the outlet of the airflow duct 27. The disturbing body 28 can be a section of reduced diameter tube and smoothly transition with the inner wall of the airflow duct 27, so that the airflow is compressed and then released when passing through, forming a Venturi effect to increase the airflow intensity.

[0039] Specifically, Figure 3 As shown, the ammonia flue gas mixer 3 is installed in the pipeline behind the gas ammonia distributor 2, and adopts a two-way flow guide plate. Its function is to fully mix the flue gas and ammonia treated by the flue gas distributor 1 and the gas ammonia distributor 2 under different loads. The design of the two-way flow guide plate can effectively promote the mixing of flue gas and ammonia, ensuring that the two are fully in contact before entering the subsequent SCR denitration reactor, thereby improving the efficiency and stability of the denitration reaction.

[0040] According to the throttling uniform distribution principle, the embodiment of the present invention performs local throttling on the flue gas or ammonia gas, appropriately increases the flow rate of the gas through each air hole, and achieves the effect of regional flue gas or ammonia gas uniform distribution.

[0041] Under different loads, according to the flue gas flow rate, the flue gas distributor actuator 13 automatically adjusts the flue gas distributor movable plate 12, adjusts the overlap of the throttle holes 110, stabilizes the gas flow rate, and realizes uniform distribution of flue gas on the flue cross section. XThe ammonia gas distributor actuator 24 automatically adjusts the position of the ammonia gas distributor movable part 23, adjusts the overlap between the second air hole 221 and the third air hole 231, stabilizes the gas flow rate, and realizes uniform distribution of ammonia spray on the flue cross section. The ammonia flue gas mixer fully mixes the flue gas spray under different loads.

[0042] In a specific embodiment, when the device of the present invention is used under low load conditions, the flue gas flow rate and nitrogen oxides NO X The concentration is relatively low. At this time, the smoke distributor actuator 13 automatically adjusts the position of the smoke distributor movable plate 12 according to the smoke flow signal detected by the sensor, so that the movable plate and the holes on the fixed plate partially overlap, reducing the cross-sectional area through which the smoke passes, increasing the smoke flow rate, and thus improving the uniformity of smoke distribution on the flue cross section. At the same time, the ammonia distributor actuator 24 adjusts the position of the smoke distributor movable plate 12 according to the smoke flow rate and NO X The concentration signal is used to adjust the position of the movable part 23 of the gas-ammonia distributor, so that the flow rate and distribution of ammonia through the throttle hole 110 are more uniform. The two-way flow guide plate of the ammonia flue gas mixer 3 further promotes the mixing of flue gas and ammonia. Through this synergistic effect, under low load conditions, the denitrification efficiency can be effectively improved to ensure that nitrogen oxides meet ultra-low emission requirements while avoiding excessive ammonia escape.

[0043] In a specific embodiment, when the device of the present invention is used under ultra-low load conditions, the flue gas flow rate and NO X The concentration is further reduced. At this time, the regulation of the flue gas distributor actuator 13 and the gas ammonia distributor actuator 24 is more critical. The flue gas distributor actuator 13 further optimizes the flue gas distribution by more finely adjusting the position of the movable plate. The gas ammonia distributor actuator 24 adjusts the flue gas flow rate and NO X The concentration can be adjusted accurately to ensure efficient denitration under ultra-low load. The bidirectional flow guide plate of the ammonia flue gas mixer 3 can effectively prevent the problem of insufficient mixing of flue gas and ammonia under this working condition, ensure the stable operation of the entire denitration system, and achieve ultra-low emission of nitrogen oxides and strict control of ammonia escape.

[0044] In a specific embodiment, when the device of the present invention is used under full load conditions, the flue gas flow rate and NO X The concentration reaches the design value. At this time, the regulating function of the flue gas distributor 1 and the gas ammonia distributor 2 is mainly reflected in maintaining the stability and uniformity of the flue gas and ammonia distribution. The flue gas distributor actuator 13 adjusts the position of the movable plate according to the high-flow flue gas signal, so that the flow rate and distribution of the flue gas through the throttle hole 110 meet the design requirements. The gas ammonia distributor actuator 24 adjusts the position of the movable plate according to the high-concentration NO XThe signal is used to adjust the distribution of ammonia to ensure that the mixing ratio of ammonia and flue gas is appropriate, thereby achieving an efficient denitration effect. The bidirectional flow guide plate of the ammonia flue gas mixer 3 can further optimize the mixing effect of flue gas and ammonia under full load conditions, ensure the efficient denitration reaction, and ensure ultra-low emissions of nitrogen oxides and control of ammonia escape.

[0045] In a specific embodiment, when the device of the present invention is applied under variable load conditions, in actual operation, the load of a coal-fired power plant may change frequently. The full-load SCR denitrification intelligent tuning device for flue gas of the present invention can adapt to such variable load conditions. When the load changes, the sensor will detect the flue gas flow rate and NO in real time. X The concentration changes and transmits the signal to the flue gas distributor actuator 13 and the gas ammonia distributor actuator 24. The two actuators quickly adjust the position of the movable plate according to the signal to dynamically optimize the distribution of flue gas and ammonia. The two-way flow guide plate of the ammonia flue gas mixer 3 can respond to this change in time to ensure that the mixing effect of flue gas and ammonia is always in the best state. Through this intelligent adjustment method, the device can always maintain an efficient denitrification effect under variable load conditions, achieve stable ultra-low emissions of nitrogen oxides and strict control of ammonia escape.

[0046] In some other specific embodiments, the device of the present invention can also work in coordination with other flue gas purification equipment, such as an electrostatic precipitator, a wet flue gas desulfurization tower, etc. In practical applications, the device is installed after the electrostatic precipitator and the wet flue gas desulfurization tower to further optimize the flue gas purification effect. The flue gas after the electrostatic precipitator removes particulate matter and the wet flue gas desulfurization tower removes sulfur dioxide enters the device for denitrification treatment. The flue gas distributor 1 and the gas-ammonia distributor 2 can effectively improve the distribution of flue gas and ammonia, and the ammonia flue gas mixer 3 ensures that the two are fully mixed. This collaborative application mode can achieve the coordinated emission reduction of multiple pollutants in the flue gas, improve the efficiency and stability of the entire flue gas purification system, and provide stronger support for the environmental protection standards of coal-fired power plants.

[0047] Compared with the prior art, the present invention can perform full-load SCR denitrification on flue gas, especially denitrification under ultra-low load, so as to achieve ultra-low emission requirements for nitrogen oxides and ammonia escape not exceeding the standard.

[0048] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A flue gas full-load SCR denitrification intelligent tuning device, characterized in that: include: A smoke distributor (1) is installed in a smoke duct, and comprises a smoke distributor fixed plate (11) and a smoke distributor movable plate (12), wherein both the smoke distributor fixed plate (11) and the smoke distributor movable plate (12) are provided with throttling holes (110), and the overlap amount of the throttling holes (110) is changed by adjusting the position of the smoke distributor movable plate (12), thereby adjusting the distribution of smoke; The ammonia gas distributor (2) is installed in the flue behind the flue gas distributor (1), and comprises an ammonia gas pipeline (21), an ammonia gas distributor fixing part (22) and an ammonia gas distributor movable part (23); the ammonia gas pipeline (21) is provided with a first air hole (211); the ammonia gas distributor fixing part (22) is fixedly connected to the ammonia gas pipeline (21) and covers the first air hole (211), and is provided with a second air hole (221); the ammonia gas distributor movable part (23) is movably connected above the ammonia gas distributor fixing part (22), and is provided with a third air hole (231); the position of the ammonia gas distributor movable part (23) is adjusted to change the overlap between the second air hole (221) and the third air hole (231), thereby adjusting the distribution of ammonia gas; The ammonia flue gas mixer (3) is installed in the flue gas behind the ammonia gas distributor (2) and is used for mixing the flue gas and ammonia.

2. The intelligent optimization device for flue gas full-load SCR denitrification according to claim 1 is characterized in that: The throttling holes (110) on the smoke uniform distributor fixed plate (11) and the smoke uniform distributor movable plate (12) are evenly distributed, and the diameters and hole spacings of the throttling holes (110) are the same.

3. The intelligent optimization device for flue gas full-load SCR denitrification according to claim 2 is characterized in that: The smoke distributor (1) further comprises a smoke distributor actuator (13), wherein the smoke distributor actuator (13) is arranged outside the flue, and its driving shaft extends into the flue and is connected to the smoke distributor movable plate (12), and is used to drive the smoke distributor movable plate (12) to reciprocate in a direction perpendicular to the flue.

4. The intelligent optimization device for flue gas full-load SCR denitrification according to claim 1 is characterized in that: The ammonia gas distributor fixing member (22) is a right-angle plate covering the ammonia gas pipeline (21), and the second air holes (221) on the two plate surfaces are symmetrically distributed. The ammonia gas distributor movable member (23) has the same shape as the ammonia gas distributor fixing member (22), and the third air holes (231) thereon correspond one-to-one with the second air holes (221).

5. The intelligent optimization device for flue gas full-load SCR denitrification according to claim 4 is characterized in that: The number of the second pores (221) is equal to the number of the first pores (211), and the aperture of the second pores (221) is half of that of the first pores (211).

6. The intelligent optimization device for flue gas full-load SCR denitrification according to claim 4 is characterized in that: The movable part (23) of the gas-ammonia distributor slides above the fixed part (22) of the gas-ammonia distributor in a direction perpendicular to the flue, and a second sealing gasket (26) is provided between the two.

7. The intelligent optimization device for flue gas full-load SCR denitrification according to claim 1 is characterized in that: An airflow conduit (27) is fixedly connected to the outer side of the third air hole (231) of the movable part (23) of the gas-ammonia distributor. The inner diameter of the airflow conduit (27) is the same as the aperture of the third air hole (231) and is used to guide the direction of the airflow.

8. The intelligent optimization device for flue gas full-load SCR denitrification according to claim 7 is characterized in that: A disturbing body (28) is provided at the outlet of the airflow duct (27). The disturbing body (28) is a reduced diameter tube body and smoothly transitions with the inner wall of the airflow duct (27) to form a Venturi effect and increase the airflow intensity.

9. The intelligent optimization device for flue gas full-load SCR denitrification according to claim 1 or 4, characterized in that: The gas-ammonia distributor (2) further comprises a gas-ammonia distributor actuator (24), which is arranged outside the flue, and has a driving shaft extending into the flue and connected to the gas-ammonia distributor movable part (23), for driving the gas-ammonia distributor movable part (23) to reciprocate in a direction perpendicular to the flue.

10. The intelligent optimization device for flue gas full-load SCR denitrification according to claim 1, characterized in that: The ammonia smoke mixer (3) adopts a bidirectional flow guide plate, which is used to fully mix the smoke and ammonia after being treated by the smoke distributor (1) and the gas-ammonia distributor (2).

Images