An adaptive ammonia-nitrogen molar ratio denitrification system

Abstract

The present invention discloses an adaptive ammonia-nitrogen molar ratio denitrification system, comprising a flue gas duct, a diversion section provided within the flue gas duct, the diversion section being provided with at least one set of parallel diversion channels, each of which being provided with an ammonia-nitrogen molar ratio detection mechanism, a plurality of flow regulating baffles provided at the inlets of the diversion channels for independently opening and closing the inlets, each flow regulating baffle having a plurality of vents distributed thereon, the vents of each flow regulating baffle varying in size, an opening and closing mechanism provided on the flue gas duct for selectively opening and closing the flow regulating baffles, the opening and closing mechanism being signal-connected to the ammonia-nitrogen molar ratio detection mechanism, the opening and closing mechanism opening and closing the corresponding flow regulating baffles based on the detection signal of the ammonia-nitrogen molar ratio detection mechanism, and a catalyst layer provided in the flue gas duct downstream of the diversion section. This adaptive ammonia-nitrogen molar ratio denitrification system has the advantages of improving denitrification efficiency and achieving a good adaptive effect.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas diversion devices, and in particular to an adaptive ammonia-nitrogen molar ratio denitrification system. Background Art

[0002] Thermal power generators, when operating on and off, can experience low-load denitration during frequency and peak regulation. Traditional wide-load denitration technology primarily relies on flue gas duct modification, but this technology has drawbacks such as a narrow scope of application, poor adaptability, and a lack of proactiveness. Consequently, a denitration device that can automatically adapt to boiler load is urgently needed to address this situation, focusing on flue gas volume and catalysts. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an adaptive ammonia-nitrogen molar ratio denitrification system that can improve denitrification efficiency and achieve good adaptive effects.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] An adaptive ammonia-nitrogen molar ratio denitrification system comprises a flue gas duct, wherein a diversion section is provided in the flue gas duct, and the diversion section is provided with at least one group of diversion channels arranged side by side, and each diversion channel is provided with an ammonia-nitrogen molar ratio detection mechanism, and a plurality of flow regulating baffles for independently opening and closing the inlet are provided at the inlet of the diversion channel, and a plurality of air vents are distributed on each of the flow regulating baffles, and the air vents of each flow regulating baffle are of different sizes. An opening and closing mechanism for selectively opening and closing the flow regulating baffle is provided on the flue gas duct, and the opening and closing mechanism is connected to the signal of the ammonia-nitrogen molar ratio detection mechanism, and the opening and closing mechanism opens and closes the corresponding flow regulating baffle according to the detection signal of the ammonia-nitrogen molar ratio detection mechanism, and a catalyst layer is provided in the flue gas duct downstream of the diversion section.

[0006] As a further improvement of the above technical solution:

[0007] There are multiple opening and closing mechanisms, and each flow regulating baffle at the entrance of the diversion channel is correspondingly connected to an opening and closing mechanism.

[0008] The opening and closing mechanism includes an opening and closing motor, a clutch assembly and multiple opening and closing assemblies, all of which are arranged on the flue gas duct. Each of the opening and closing assemblies is connected to each flow regulating baffle in a one-to-one manner. The opening and closing motor is transmission-connected to each opening and closing assembly through the clutch assembly. The clutch assembly is signal-connected to the ammonia-nitrogen molar ratio detection mechanism, and engages with the corresponding opening and closing assembly according to the detection signal of the ammonia-nitrogen molar ratio detection mechanism to open and close the corresponding flow regulating baffle.

[0009] The diversion channel is square, and the flow regulating baffles are hinged on different sides of the diversion channel inlet.

[0010] The opening and closing assembly includes a wire reel provided on the flue gas duct and a pull wire wound around the wire reel. The pull wire is connected to the corresponding flow regulating baffle. The clutch assembly is engaged with the wire reel. The flue gas duct is provided with a locking mechanism on the side of each wire reel for locking the wire reel.

[0011] The locking mechanism includes a locking rod rotatably arranged in the middle on the flue gas duct and a locking and releasing driving component for driving the locking rod to swing. One end of the locking rod is connected to the locking and releasing driving component, and the other end is provided with a locking tooth. The peripheral side of the winding reel is provided with a plurality of locking openings for inserting the locking teeth, and each of the locking openings is arranged at intervals around the center of the winding reel.

[0012] The winding reel is provided with a transmission gear, and the clutch assembly includes a transmission shaft, a clutch gear slidably arranged on the transmission shaft and rotating synchronously with the transmission shaft, and a toggle for toggling the clutch gear to slide along the transmission shaft. The clutch gear is engaged and disengaged with the transmission gear.

[0013] The self-adaptive ammonia-nitrogen molar ratio denitrification system further comprises a control module, and the opening and closing motor, the ammonia-nitrogen molar ratio detection mechanism, the locking and releasing driving member and the toggle are all connected to the control module by signal.

[0014] The diversion section is square.

[0015] A rectifying grid is provided in the flue gas duct upstream of the diversion section.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] The adaptive ammonia-nitrogen molar ratio denitrification system of the present invention can select a flow regulating baffle with a corresponding aperture according to the size of the ammonia-nitrogen molar ratio, thereby adjusting the flue gas flow rate of the corresponding part of the catalyst layer, so as to make the ammonia-nitrogen mixing more uniform, and at the same time reduce the flue gas flow rate at the place with large flue gas flow, prevent excess ammonia from escaping, prolong its residence time in the catalyst layer, improve the denitrification efficiency, and achieve a good adaptive effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main cross-sectional structure of the adaptive ammonia-nitrogen molar ratio denitrification system of the present invention.

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the diversion channel of the self-adaptive ammonia-nitrogen molar ratio denitrification system of the present invention.

[0020] Figure 3 It is a first-perspective three-dimensional structural schematic diagram of the opening and closing mechanism of the adaptive ammonia-nitrogen molar ratio denitrification system of the present invention.

[0021] Figure 4 It is a second perspective stereoscopic structural diagram of the opening and closing mechanism of the adaptive ammonia-nitrogen molar ratio denitrification system of the present invention.

[0022] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0023] The numbers in the figure represent:

[0024] 1. Flue gas duct; 11. Diversion section; 2. Diversion channel; 3. Ammonia-nitrogen molar ratio detection mechanism; 4. Flow regulating baffle; 41. Air vent; 5. Opening and closing mechanism; 51. Opening and closing motor; 52. Clutch assembly; 521. Drive shaft; 522. Clutch gear; 523. Toggle; 53. Opening and closing assembly; 531. Reel; 532. Pull wire; 533. Locking port; 534. Drive gear; 6. Locking mechanism; 61. Locking rod; 611. Locking tooth; 62. Locking and releasing drive member; 7. Catalyst layer; 8. Rectifier grid. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] As shown in this disclosure and the claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not specifically refer to the singular, but also include the plural. The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0027] Figures 1 to 5 An embodiment of the adaptive ammonia-nitrogen molar ratio denitrification system of the present invention is shown. The adaptive ammonia-nitrogen molar ratio denitrification system of this embodiment includes a flue gas duct 1, a diversion section 11 is provided in the flue gas duct 1, the diversion section 11 is provided with at least one group of diversion channels 2 arranged side by side, each diversion channel 2 is provided with an ammonia-nitrogen molar ratio detection mechanism 3, and a plurality of flow regulating baffles 4 for independently opening and closing the inlet are provided at the inlet of the diversion channel 2. A plurality of air holes 41 are distributed on each flow regulating baffle 4, and the air holes 41 of each flow regulating baffle 4 are of different sizes. An opening and closing mechanism 5 for selectively opening and closing the flow regulating baffle 4 is provided on the flue gas duct 1, and the opening and closing mechanism 5 is connected to the ammonia-nitrogen molar ratio detection mechanism 3 by signal. The opening and closing mechanism 5 opens and closes the corresponding flow regulating baffle 4 according to the detection signal of the ammonia-nitrogen molar ratio detection mechanism 3, and a catalyst layer 7 is provided downstream of the diversion section 11 in the flue gas duct 1.

[0028] When in use, the air inlet of the flue gas duct 1 is connected to the exhaust flue of the boiler, and the diversion section 11 is located upstream of the catalyst layer 7 (in this embodiment, the diversion section 11 is located above the catalyst layer 7 and close to the catalyst layer 7). Ventilation holes 41 of different sizes are distributed on each flow regulating baffle 4 at the entrance of each diversion channel 2, that is, the apertures of the vents 41 on different flow regulating baffles 4 are different. The flow regulating baffle 4 is mainly used to control the various physical parameters of the flue gas entering the catalyst layer 7; the ammonia nitrogen molar ratio detection mechanism 3 is used to detect the ammonia nitrogen content in the flue gas in the diversion channel 2 and calculate the ammonia nitrogen molar ratio, so as to feed back to the opening and closing mechanism 5, so that the opening and closing mechanism 5 takes effect; when the operating condition of the ammonia nitrogen molar ratio in the diversion channel 2 changes, the opening and closing mechanism 5 opens the flow regulating baffle 4 corresponding to the original operating condition, and closes the flow regulating baffle 4 corresponding to the changed operating condition. If there are four flow regulating baffles 4, the operating conditions corresponding to the apertures of the vent holes 41 on each flow regulating baffle 4 are 0, 20%, 50%, and 70% of the original operating conditions, respectively. When all the flow regulating baffles 4 are raised, the ammonia nitrogen in each part of the diversion section 11 is evenly mixed and the flow rate is appropriate. If the ammonia nitrogen molar ratio in the diversion channel 2 is 0-35% of the normal ammonia nitrogen molar ratio, the flow regulating baffle 4 with a load of 20% is closed; if it is 35%-60%, the flow regulating baffle 4 with a load of 50% is closed; if it is 60%-85%, the flow regulating baffle 4 with a load of 70% is closed; if it exceeds 85%, all the flow regulating baffles 4 are raised to even out the ammonia nitrogen molar ratio at each part, so as to achieve the maximum utilization rate of ammonia and prevent ammonia from escaping.

[0029] The flow area of the flow regulating baffle 4 with a small aperture is reduced, and the flue gas is subject to greater resistance. Less flue gas passes through the flow regulating baffle 4, that is, the shunt channel 2 with a small ammonia-nitrogen molar ratio, and the amount of flue gas discharged is also reduced, thereby reducing the situation where NOx removal is incomplete due to the small ammonia-nitrogen molar ratio. The flow area of the flow regulating baffle 4 with a large aperture is increased, and the flue gas is subject to less resistance. More flue gas passes through the flow regulating baffle 4, that is, the shunt channel 2 with a large ammonia-nitrogen molar ratio, and the amount of flue gas discharged is also increased, and the amount of flue gas passing through the downstream catalyst layer 7 is increased. In other words, the shunt channel 2 with a small ammonia-nitrogen molar ratio, due to its small discharge volume, forces more flue gas with a small ammonia-nitrogen molar ratio to enter the shunt channel 2 with a large ammonia-nitrogen molar ratio, making the discharged ammonia and nitrogen more evenly mixed, and preventing the escape of ammonia nitrogen caused by a high ammonia-nitrogen molar ratio and a small amount of flue gas.

[0030] The adaptive ammonia-nitrogen molar ratio denitrification system of the present invention can select a flow regulating baffle 4 of corresponding aperture according to the size of the ammonia-nitrogen molar ratio, thereby adjusting the flue gas flow rate of the corresponding part of the catalyst layer 7, so as to make the ammonia-nitrogen mixing more uniform, and at the same time reduce the flue gas flow rate at the place with large flue gas flow, prevent excess ammonia from escaping, prolong its residence time in the catalyst layer 7, improve the denitrification efficiency, and achieve a good adaptive effect.

[0031] In this embodiment, there are multiple opening and closing mechanisms 5, and each flow regulating baffle 4 at the entrance of each diversion channel 2 is connected to a corresponding opening and closing mechanism 5. Specifically, Figure 3 and Figure 4 As shown, the opening and closing mechanism 5 includes an opening and closing motor 51, a clutch assembly 52, and a plurality of opening and closing assemblies 53, all of which are arranged on the flue gas duct 1. Each opening and closing assembly 53 is connected to each flow regulating damper 4 in a one-to-one correspondence. The opening and closing motor 51 is connected to each opening and closing assembly 53 through the clutch assembly 52. The clutch assembly 52 is connected to the ammonia nitrogen molar ratio detection mechanism 3 by signal. According to the detection signal of the ammonia nitrogen molar ratio detection mechanism 3, it engages with the corresponding opening and closing assembly 53 to open and close the corresponding flow regulating damper 4. For example, if 70% of the flow regulating dampers 4 at the inlet of the diverter channel 2 are closed, when the ammonia nitrogen molar ratio detection mechanism 3 in the diverter channel 2 detects that the ammonia nitrogen molar ratio is 35%-60%, the opening and closing motor 51 first drives 70% of the flow regulating dampers 4 to open, and the clutch assembly 52 then engages with the opening and closing assembly 53 corresponding to the 50% load flow regulating damper 4, driving the 50% load flow regulating damper 4 to close, thereby achieving the effect of closing the corresponding flow regulating damper 4 according to the ammonia nitrogen molar ratio.

[0032] In this embodiment, Figure 2 As shown, the diversion channel 2 is square, and the flow regulating baffles 4 are hinged on different sides of the diversion channel 2 entrance. Specifically, four flow regulating baffles 4 are provided at the entrance of each diversion channel 2, and the four flow regulating baffles 4 are hinged on the four sides of the diversion channel 2 entrance. This has a simple structure and is easy to manufacture.

[0033] In this embodiment, Figure 3 and Figure 4 As shown, the opening and closing assembly 53 includes a cable reel 531 provided on the flue gas duct 1 and a pull wire 532 wound around the cable reel 531. The pull wire 532 is connected to the corresponding flow regulating baffle 4. The clutch assembly 52 engages and disengages with the cable reel 531. The flue gas duct 1 is provided with a locking mechanism 6 on the side of each cable reel 531 for locking the cable reel 531. Specifically, the four flow regulating baffles 4 at the entrance of each diversion channel 2 correspond to four cable reels 531 arranged side by side on the outer wall of the flue gas duct 1. The clutch assembly 52 engages and disengages with the four side-by-side cable reels 531, and engages and disengages with the corresponding cable reel 531 based on the detection signal of the ammonia nitrogen molar ratio detection mechanism 3 to open and close the corresponding flow regulating baffle 4. When the flow regulating baffle 4 is fully opened, the locking mechanism 6 locks the cable reel 531 corresponding to the flow regulating baffle 4.

[0034] In this embodiment, Figure 5As shown, the locking mechanism 6 includes a locking rod 61 whose central portion is rotatably mounted on the flue gas duct 1, and a locking and releasing driving member 62 for driving the locking rod 61 to swing. One end of the locking rod 61 is connected to the locking and releasing driving member 62, and the other end is provided with a locking tooth 611. The peripheral side of the cable reel 531 is provided with a plurality of locking openings 533 for inserting the locking teeth 611, and the locking openings 533 are arranged at intervals around the center of the cable reel 531. The locking and releasing driving member 62 drives the locking rod 61 to swing so that the locking teeth 611 are inserted into the locking openings 533 on the peripheral side of the cable reel 531, thereby locking the cable reel 531. Conversely, the locking and releasing driving member 62 drives the locking rod 61 to swing in the opposite direction, so that the locking teeth 611 are pulled out of the locking openings 533 on the peripheral side of the cable reel 531, thereby unlocking the cable reel 531. Specifically, the locking and releasing drive member 62 includes a locking and releasing motor and a bent rod. The locking and releasing motor is mounted on the flue gas duct 1. The bent rod is connected to the driving shaft of the locking and releasing motor. The end of the locking rod 61 away from the locking teeth 611 is rotatably connected to the bent rod. A return spring can also be provided between the locking rod 61 and the flue gas duct 1.

[0035] In this embodiment, Figure 3 and Figure 4 As shown, a transmission gear 534 is provided on the cable reel 531. The clutch assembly 52 includes a transmission shaft 521, a clutch gear 522 slidably mounted on the transmission shaft 521 and rotating synchronously with the transmission shaft 521, and a toggle 523 for toggling the clutch gear 522 to slide along the transmission shaft 521. The clutch gear 522 engages and disengages with the transmission gear 534. The clutch gear 522 can be divided into a first set of clutch gears 522 and a second set of clutch gears 522. By toggling the first set of clutch gears 522 axially along the transmission shaft 521 via the toggle 523, one clutch gear 522 in the first set of clutch gears 522 can be engaged with the transmission gear 534 of one cable reel 531, while the other clutch gear 522 is disengaged from the transmission gear 534 of the other cable reel 531, thereby realizing the opening and closing of the single flow regulating baffle 4. By pulling the second clutch gear 522 along the axial direction of the transmission shaft 521 through the toggle 523, each clutch gear 522 can be engaged with the transmission gear 534 of each winding reel 531, so that each flow regulating baffle 4 is opened.

[0036] In this embodiment, the adaptive ammonia-nitrogen molar ratio denitrification system also includes a control module, to which the opening and closing motor 51, the ammonia-nitrogen molar ratio detection mechanism 3, the lock-release driver 62, and the toggle 523 are all signal-connected. The ammonia-nitrogen molar ratio detection mechanism 3 transmits a detection signal to the control module. Based on the received detection signal, the control module controls the movement of the toggle 523, causing the clutch gear 522 to engage with the transmission gear 534 of the corresponding cable reel 531, thereby opening and closing the corresponding flow regulating baffle 4. An opening contact switch is provided on the flue gas duct 1, which contacts the flow regulating baffle 4 when it is opened. The opening contact switch is signal-connected to the control module. When the flow regulating baffle 4 is fully opened, the opening contact switch transmits an opening signal to the control module. Based on the received opening signal, the control module sends a command to the lock-release driver 62, causing the lock-release driver 62 to swing the locking rod 61, causing the locking teeth 611 to engage the locking opening 533 on the side of the cable reel 531, thereby locking the flow regulating baffle 4 in the open state. Specifically, the diversion section 11 is vertically arranged, the diversion channel 2 is vertically arranged, the top opening of the diversion channel 2 is the inlet, and the bottom opening is the outlet. The flow regulating baffle 4 can be flipped down and closed under the action of its own gravity, and opened under the upward pulling action of the pull wire 532.

[0037] In this embodiment, the diversion section 11 is square. A rectifying grid 8 is provided upstream of the diversion section 11 in the flue gas duct 1 . Figure 1 The direction of the arrow in the middle is the direction of flue gas flow.

[0038] Although the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, utilize the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. An adaptive ammonia-nitrogen molar ratio denitrification system, comprising a flue gas duct (1), characterized in that: The flue gas duct (1) is provided with a diversion section (11), the diversion section (11) is provided with at least one group of diversion channels (2) arranged side by side, each of the diversion channels (2) is provided with an ammonia nitrogen molar ratio detection mechanism (3), a plurality of flow regulating baffles (4) for independently opening and closing the inlet are provided at the inlet of the diversion channel (2), a plurality of vents (41) are distributed on each of the flow regulating baffles (4), and the vents (41) of each of the flow regulating baffles (4) are of different sizes, an opening and closing mechanism (5) for selectively opening and closing the flow regulating baffles (4) is provided on the flue gas duct (1), and the opening and closing mechanism (5) is related to the ammonia nitrogen molar ratio. The detection mechanism (3) is connected to the signal of the detection mechanism (3), and the opening and closing mechanism (5) opens and closes the corresponding flow regulating baffle (4) according to the detection signal of the ammonia nitrogen molar ratio detection mechanism (3). A catalyst layer (7) is provided in the flue gas duct (1) downstream of the diversion section (11); the opening and closing mechanism (5) is provided with a plurality of flow regulating baffles (4) at the entrance of each diversion channel (2) and is connected to a corresponding opening and closing mechanism (5); the opening and closing mechanism (5) includes an opening and closing motor (51), a clutch component (52) and a plurality of opening and closing components (53) all provided on the flue gas duct (1), and each opening and closing component (53) is connected to each flow regulating baffle (4) one by one. The opening and closing motor (51) is connected to each opening and closing component (53) through a clutch component (52), and the clutch component (52) is connected to the ammonia nitrogen molar ratio detection mechanism (3) by signal. According to the detection signal of the ammonia nitrogen molar ratio detection mechanism (3), the opening and closing component (53) is engaged with the corresponding opening and closing component (53) to open and close the corresponding flow regulating baffle (4); the opening and closing component (53) includes a winding drum (531) provided on the flue gas duct (1) and a pull wire (532) wound on the winding drum (531), the pull wire (532) is connected to the corresponding flow regulating baffle (4), the clutch component (52) is connected to the winding drum (53 1) Clutch cooperation, the flue gas duct (1) is provided with a locking mechanism (6) on the side of each winding drum (531) for locking the winding drum (531); the locking mechanism (6) comprises a locking rod (61) rotatably arranged in the middle on the flue gas duct (1) and a locking and releasing driving member (62) for driving the locking rod (61) to swing; one end of the locking rod (61) is connected to the locking and releasing driving member (62), and the other end is provided with a locking tooth (611); a plurality of locking openings (533) for inserting the locking teeth (611) are provided on the peripheral side of the winding drum (531), and each of the locking openings (533) is arranged at intervals around the center of the winding drum (531).

2. The adaptive ammonia-nitrogen molar ratio denitrification system according to claim 1, characterized in that: The diversion channel (2) is square, and the flow regulating baffles (4) are hinged to different sides of the inlet of the diversion channel (2).

3. The adaptive ammonia-nitrogen molar ratio denitrification system according to claim 2, characterized in that: The cable reel (531) is provided with a transmission gear (534), and the clutch assembly (52) includes a transmission shaft (521), a clutch gear (522) slidably arranged on the transmission shaft (521) and rotating synchronously with the transmission shaft (521), and a toggle (523) for toggling the clutch gear (522) to slide along the transmission shaft (521), and the clutch gear (522) and the transmission gear (534) are engaged and disengaged.

4. The adaptive ammonia-nitrogen molar ratio denitrification system according to claim 3, characterized in that: The self-adaptive ammonia-nitrogen molar ratio denitrification system further comprises a control module, and the opening and closing motor (51), the ammonia-nitrogen molar ratio detection mechanism (3), the locking and releasing driving member (62) and the toggle (523) are all connected to the control module by signal.

5. The adaptive ammonia-nitrogen molar ratio denitrification system according to claim 2, characterized in that: The diversion section (11) is square.

6. The adaptive ammonia-nitrogen molar ratio denitrification system according to any one of claims 1 to 5, characterized in that: A rectifying grid (8) is provided in the flue gas duct (1) upstream of the diversion section (11).

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