A flue gas denitrification device

Abstract

The present invention discloses a flue gas denitrification device, which relates to the technical field of nitrogen oxide waste gas treatment, including a flue, wherein the flue is in an inverted L shape, an ammonia spraying mechanism is provided in the middle of the vertical section of the flue, a cleaning mechanism located above the ammonia spraying mechanism is provided in the middle of the vertical section of the flue, and an anti-escape mechanism is provided on the flue and the cleaning mechanism. The present invention performs batch cleaning on multiple ammonia spray nozzles on the same auxiliary pipeline through two clearing operations, thereby improving the clearing efficiency; the multiple ammonia outlets on the ammonia spray nozzles are divided into two groups, and a two-group alternating cleaning mode is adopted to avoid the ammonia spray nozzles being completely blocked during cleaning, resulting in an improper ratio between the amount of ammonia sprayed and the amount of exhaust gas, ultimately affecting the denitrification efficiency and causing nitrogen emissions to be substandard; it can also prevent the released ammonia from escaping due to excessive flow rate; the gas buffer space formed by the changes in the blades of the upper and lower corresponding guide plate groups prevents the effect of reduced ammonia spraying during cleaning, which causes the exhaust gas to continue to enter and cause excessive exhaust gas.

Description

Technical Field

[0001] The present invention relates to the technical field of nitrogen oxide waste gas treatment, and in particular to a flue gas denitration device. Background Art

[0002] Nitrogen oxides are one of the important pollutants that cause environmental problems such as acid rain, photochemical smog and greenhouse effect. Flue gas denitrification equipment is mainly used to reduce the emission of nitrogen oxides generated during the combustion process to alleviate environmental pollution. The main flue gas denitrification methods include selective catalytic reduction, selective non-catalytic reduction, absorption, etc. The treatment steps of the selective catalytic reduction method are generally as follows: first, exhaust gas containing nitrogen oxides is introduced into the flue, and then an ammonia / air mixed gas or treated urea decomposition products are sprayed into the flue through an injection device to fully mix it with the exhaust gas containing nitrogen oxides. The mixed exhaust gas passes through a reactor equipped with a catalyst, where a chemical reaction occurs to produce nitrogen and water, thereby achieving exhaust gas treatment.

[0003] In the process of existing flue gas denitrification using selective catalytic reduction, the exhaust gas entering the flue contains pollutants such as dust and oil, and the gradual accumulation of urea crystals will cause the injection device to be blocked. In the case of blocked injection devices, it is often necessary to regularly shut down the system and disassemble the nozzles to clean them one by one, or to use the self-cleaning nozzles to perform self-cleaning during the operation of the system; however, the former is not efficient and requires shutting down the system, which affects the flue gas denitrification process. Secondly, the latter's self-cleaning operation of the nozzle is based on the change in pressure in the pipeline. The air pressure in the pipeline is used as an indicator parameter to judge whether the nozzle is blocked. The cleaning indication is triggered only when the nozzle is completely blocked, resulting in an improper ratio of the amount of ammonia sprayed to the amount of exhaust gas; thirdly, during the cleaning process, the amount of ammonia sprayed by the nozzle is affected, and the continuous entry of exhaust gas will lead to excessive exhaust gas, resulting in local uneven mixing.

[0004] Therefore, in order to improve the cleaning efficiency and prevent uneven mixing, the present invention provides a flue gas denitrification device. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and to propose a flue gas denitrification device.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A flue gas denitrification device includes a flue, which is in an inverted L-shape. An ammonia spraying mechanism is provided in the middle of the vertical section of the flue, and the ammonia spraying mechanism is composed of a main pipe mounted on the rear side wall of the flue in a front-to-rear direction and a plurality of auxiliary pipes evenly distributed on the main pipe in a left-to-right direction. A plurality of ammonia spraying nozzles are installed on the top wall of the auxiliary pipes, and a plurality of ammonia outlets are opened circumferentially on the ammonia spraying nozzles. A cleaning mechanism is provided in the middle of the vertical section of the flue and is located above the ammonia spraying mechanism, and an anti-escape mechanism is provided on both the flue and the cleaning mechanism.

[0008] The cleaning mechanism includes a support frame connected to the left and right side walls of the middle part of the vertical section of the flue through an electric slider that slides back and forth. A cleaning component corresponding to the ammonia spray nozzle is provided on the support frame. The cleaning component is used to alternately clear blockages of multiple ammonia outlets on the same ammonia spray nozzle. The cleaning component is provided with a flow diffuser group. The flow diffuser group is used to expand and reduce the speed of multiple ammonia outlets on non-clearing stations.

[0009] The anti-escape mechanism includes a guide plate group symmetrically arranged up and down with the ammonia injection mechanism as the center, and an opening and closing adjustment component symmetrically arranged on the inner wall of the flue and corresponding to the guide plate group. The opening and closing adjustment component drives the guide plate group to perform partial opening and closing adjustment to prevent ammonia escape and excessive exhaust gas during cleaning.

[0010] In the above-mentioned flue gas denitrification device, the cleaning component includes a gear ring 1, the middle part of the support frame is in the shape of a circular frame, and a plurality of gear rings 1 corresponding to the ammonia spray nozzles are connected on the circular frame in a uniform rotation from left to right, the inner ring wall of the gear ring 1 is fixedly connected to the support rod, and the top wall of the support rod is connected to the X-shaped frame through a spring rod.

[0011] In the above-mentioned flue gas denitrification device, a protrusion is fixedly connected to the middle of the top wall of the X-shaped frame, and the four corners of the bottom wall of the X-shaped frame are fixedly connected to the clearing cylinders corresponding to the ammonia outlet. The inside of the clearing cylinder is connected to the clearing plug for sliding up and down, and the top walls of multiple clearing plugs are commonly fixedly connected to a lower pressure frame, which is connected to the X-shaped frame by a spring for sliding up and down.

[0012] In the above-mentioned flue gas denitrification device, the inner ring wall of the gear ring 1 is symmetrically fixed with a diffuser group corresponding to the ammonia outlet through an extension plate with the support rod as the center, and the diffuser group is in an inverted cone shape. A dispersion disk with several through holes is fixed in the middle of the diffuser group.

[0013] In the above-mentioned flue gas denitrification device, a rack and a driving mechanism for driving the cleaning component are provided on the support frame. A rack is connected to the support frame through an electric slider that slides left and right and engages with a gear ring in front and back. The rack slides through the circular frame.

[0014] In the above-mentioned flue gas denitrification device, the driving mechanism includes a circular frame, the top wall of the circular frame is connected to the circular frame by an electric slider for sliding up and down, and the top wall of the circular frame is fixedly connected to a connecting plate corresponding to the X-shaped frame, and the bottom wall of the connecting plate is fixedly connected to a pressing round block corresponding to the protrusion and a pressing square block group corresponding to the lower pressure frame.

[0015] In the above-mentioned flue gas denitrification device, the guide plate group is rotatably connected between the left and right inner walls of the vertical section of the flue through a torsion spring rod. The inclination direction of the upper guide plate group is opposite to that of the lower guide plate group. The left and right ends of the torsion spring rod are both equipped with a gear ring 2.

[0016] In the above-mentioned flue gas denitrification device, the opening and closing adjustment component includes an inverted T-shaped piece connected to the inner wall of the flue through spring 2, and the upper part of the front side wall of the vertical section of the inverted T-shaped piece is inclined. The inverted T-shaped piece is used to push the guide plate group for partial closing adjustment during cleaning operations.

[0017] In the above-mentioned flue gas denitrification device, the inner wall of the flue is connected to a rake-like member by sliding up and down through spring three, and the vertical section of the rake-like member is fixedly connected to a wedge block one. The rake-like member locks the inclination angle of the torsion spring rod and the guide plate group by engaging with the installed rack two and the gear ring two.

[0018] In the above-mentioned flue gas denitrification device, the anti-escape mechanism also includes a driving member that is symmetrically arranged at the left and right ends of the support frame through an electric push rod. The driving member is composed of a trapezoidal plate fixedly connected to the support frame and a wedge block 2 corresponding to the wedge block 1 fixed to the side wall of the trapezoidal plate through an L-shaped plate, and the side of the trapezoidal plate close to the inverted T-shaped member is inclined to match it.

[0019] Compared with the existing technology, the advantages of the present invention are:

[0020] 1. Through the cooperation of the support frame and the cleaning component, multiple ammonia spray nozzles on the same auxiliary pipeline are cleaned in batches through two clearing operations to improve the clearing efficiency; the clearing cylinder moves downward to scrape off some impurities on the inner wall of the corresponding ammonia outlet to prevent dust, oil and other pollutants in the exhaust gas and ammonia crystals from clogging the ammonia outlet. At this time, the pressure of ammonia sprayed from the ammonia outlet causes the scraped impurities to enter the interior of the clearing cylinder, and the impurities inside the clearing cylinder are pushed downward and discharged from the interior of the clearing cylinder through clearing, which is convenient for the next cleaning.

[0021] 2. By coordinating the support frame, cleaning components and diffuser cover group, the multiple ammonia outlets on the ammonia spray nozzle are divided into two groups. The two groups are cleaned alternately to avoid the ammonia spray nozzle being completely blocked during cleaning, resulting in an improper ratio between the amount of ammonia sprayed and the amount of exhaust gas, which ultimately affects the denitrification efficiency and causes nitrogen emissions to fail to meet standards.

[0022] 3. Through the coordination of the cleaning mechanism and the anti-escape mechanism, during the cleaning process, part of the ammonia gas from the uncleaned ammonia outlet diffuses circumferentially through the bottom wall of the diffuser group, and part of the ammonia gas is diffused and diverted through the middle dispersion disk of the diffuser group to prevent the released ammonia from escaping due to excessive flow rate; the gas buffer space formed by the change of the upper and lower corresponding guide plate group blades changes the opening and closing of the upper and lower corresponding guide plate group blades as the cleanable position changes, preventing the impact of reduced ammonia spraying amount during cleaning, and the continuous entry of exhaust gas leading to excessive exhaust gas, which in turn leads to local uneven mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0024] Figure 1 A schematic diagram of the overall structure.

[0025] Figure 2 It is a partial structural diagram of the ammonia spraying mechanism and the cleaning mechanism.

[0026] Figure 3 for Figure 2 Schematic diagram of the structure at point A.

[0027] Figure 4 It is a partial structural diagram of the cleaning component and diffuser group.

[0028] Figure 5 Schematic diagram of the changes before and after the gear ring rotates.

[0029] Figure 6 A schematic diagram of the partial structural decomposition of the drive mechanism and cleaning components.

[0030] Figure 7 Schematic diagram of the changes before and after the blockage is cleared and moved downward.

[0031] Figure 8 This is a partial structural diagram of the anti-escape mechanism.

[0032] Figure 9 It is a partial structural diagram of the driving part and the opening and closing adjustment component.

[0033] Figure 10 Schematic diagram of the changes of the guide plate group before and after deflection.

[0034] In the figure: 1. Flue; 2. Ammonia spraying mechanism; 3. Cleaning mechanism; 31. Support frame; 32. Cleaning assembly; 321. Gear ring 1; 322. Support rod; 323. X-shaped frame; 324. Bump; 325. Blockage removal cylinder; 326. Down-pressing frame; 327. Blockage removal; 33. Diffuser assembly; 34. Rack 1; 35. Driving mechanism; 351. Reciprocating frame; 352. Connecting plate; 353. Pressing round block; 354. Pressing square block assembly; 4. Anti-escape mechanism; 41. Driving part; 42. Opening and closing adjustment assembly; 421. Inverted T-shaped part; 422. Wedge block 1; 423. Rake-shaped part; 424. Rack 2; 43. Guide plate assembly; 44. Gear ring 2. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0036] Reference Figures 1 to 2 A flue gas denitrification device includes a flue 1, which is in an inverted L shape. An ammonia injection mechanism 2 is provided in the middle of the vertical section of the flue 1. The ammonia injection mechanism 2 consists of a main pipeline mounted on the rear side wall of the flue 1 in a front-to-back direction and a plurality of auxiliary pipelines evenly distributed on the main pipeline in a left-to-right direction. A plurality of ammonia injection nozzles are installed on the top wall of the auxiliary pipeline. A plurality of ammonia outlets are opened on the ammonia injection nozzles in a circumferential direction. A cleaning mechanism 3 is provided in the middle of the vertical section of the flue 1 and is located above the ammonia injection mechanism 2. An anti-escape mechanism 4 is provided on the flue 1 and the cleaning mechanism 3.

[0037] The waste gas containing nitrogen oxides is passed into the flue 1 from bottom to top under the action of the induced draft fan (not shown in the figure, the induced draft fan is an existing mature equipment and will not be described in detail here). At the same time, ammonia is sprayed into the flue 1 through the ammonia spraying mechanism 2. The waste gas and ammonia are fully mixed. The mixed waste gas is discharged into a reactor equipped with a catalyst through the upper end outlet of the flue 1, where a chemical reaction occurs to generate nitrogen and water, thereby realizing waste gas treatment. After continuous use for a period of time, the ammonia spraying mechanism 2 is batch cleaned by the cleaning mechanism 3 to prevent blockage. The anti-escape mechanism 4 is driven by the cleaning mechanism 3 to prevent ammonia escape and excessive waste gas during the cleaning process.

[0038] Reference Figures 1 to 2The cleaning mechanism 3 includes a support frame 31 connected to the left and right side walls of the middle part of the vertical section of the flue 1 by an electric slider that slides back and forth. A cleaning component 32 corresponding to the ammonia spray nozzle is provided on the support frame 31. The cleaning component 32 is used to alternately clear the multiple ammonia outlets on the same ammonia spray nozzle. The cleaning component 32 is provided with a diffuser group 33. The diffuser group 33 is used to expand and reduce the speed of multiple ammonia outlets on non-clearing stations.

[0039] Reference Figures 2 to 7 The cleaning component 32 includes a gear ring 321. The middle part of the support frame 31 is in the shape of a circular frame. A plurality of gear rings 321 corresponding to the ammonia spray nozzles are connected to the circular frame in a uniform rotation from left to right. The inner ring wall of the gear ring 321 is fixedly connected to a support rod 322, and the top wall of the support rod 322 is connected to an X-shaped frame 323 through a spring rod; a protrusion 324 is fixedly connected to the middle part of the top wall of the X-shaped frame 323, and the four corners of the bottom wall of the X-shaped frame 323 are fixedly connected to a clearing cylinder 325 corresponding to the ammonia outlet, and a clearing plug 327 is connected to the inside of the clearing plug 325 for sliding up and down. The top walls of the plurality of clearing plugs 327 are fixedly connected to a lower pressure frame 326, and the lower pressure frame 326 is connected to the X-shaped frame 323 for sliding up and down through a spring 1 (not shown in the figure).

[0040] Reference Figure 2 、 Figure 4 and Figure 5 The inner ring wall of the gear ring 321 is symmetrically fixed with a diffuser group 33 corresponding to the ammonia outlet through an extension plate with the support rod 322 as the center. The diffuser group 33 is in an inverted cone shape, and a dispersion disk with a plurality of through holes is fixed in the middle of the diffuser group 33; a rack 34 and a driving mechanism 35 for driving the cleaning component 32 to operate are provided on the support frame 31. The support frame 31 is connected to a rack 34 that meshes with the gear ring 321 front and back through an electric slider that slides left and right, and the rack 34 slides through the circular frame.

[0041] Reference Figure 2 、 Figure 3 and Figure 6 The driving mechanism 35 includes a circular frame 351, the top wall of the circular frame is connected to the circular frame 351 by an electric slider for sliding up and down. The top wall of the circular frame 351 is fixedly connected to a connecting plate 352 corresponding to the X-shaped frame 323, and the bottom wall of the connecting plate 352 is fixedly connected to a pressing round block 353 corresponding to the protrusion 324 and a pressing square group 354 corresponding to the lower pressure frame 326.

[0042] When the cleaning mechanism 3 is cleaning, there is no need to shut down the system. The support frame 31 slides back and forth driven by the electric slider and stops above each auxiliary pipeline in turn, which is convenient for batch cleaning operations.

[0043] When cleaning multiple ammonia spray nozzles on a single auxiliary pipeline, the clearing cylinder 325 and diffuser assembly 33 are aligned with the corresponding ammonia outlet below. Driven by the electric slider, the circular frame 351 moves downward, the connecting plate 352 moves downward, and the pressing block 353 pushes downward against the protrusion 324, the X-shaped frame 323, and the clearing cylinder 325. At this point, the pressing block assembly 354 and the lower pressing frame 326 are positioned in an interlaced state. The clearing cylinder 325 moves downward into the corresponding ammonia outlet and scrapes away impurities from the inner wall of the corresponding ammonia outlet, preventing contaminants such as dust and oil in the exhaust gas and ammonia crystals from clogging the ammonia outlet. The pressure of the ammonia gas ejected from the ammonia outlet causes the scraped impurities to enter the interior of the clearing cylinder 325, preventing them from falling into the outlet. To facilitate insertion of the clearing cylinder 325 into the corresponding outlet, the ammonia outlet may be chamfered.

[0044] When the tooth ring 1 321 rotates forty-five degrees clockwise, the circular frame 351 continues to move downward through the drive of the electric slider. At this time, the pressing block group 354 and the lower pressing frame 326 change from a staggered state to a partially overlapping state, and the blockage clearing cylinder 325 rotates from the upper and lower corresponding state with the ammonia outlet to a staggered state. The pressing block group 354 moves downward to push the lower pressing frame 326 and the blockage clearing cylinder 327 to move downward. The blockage clearing cylinder 325 pushes the impurities inside the blockage clearing cylinder 325 downward to discharge them from the interior of the blockage clearing cylinder 325, making it easier to clean next time. The circular frame 351 moves upward through the drive of the electric slider to reset, and the pressing block group 354 and the lower pressing frame 326 are reset.

[0045] When the gear ring 321 rotates ninety degrees clockwise, the clearing cylinder 325 rotates to correspond to the uncleaned ammonia outlet, and the circular frame 351 continues to move downward driven by the electric slider, driving the pressing block 353 to push the protrusion 324, the X-shaped frame 323 and the clearing cylinder 325 downward to clean the uncleaned ammonia outlet.

[0046] When cleaning part of the ammonia outlet on the ammonia spray nozzle, this part of the ammonia outlet is blocked, so the pressure on the other part of the ammonia outlet becomes greater, and the flow rate of the ammonia discharge becomes faster. The diffuser cover group 33 corresponds to the other part of the uncleaned ammonia outlet up and down, so that part of the ammonia is diffused circumferentially through the bottom wall of the diffuser cover group 33, and part of the ammonia is diffused and diverted through the middle dispersion disk of the diffuser cover group 33 to prevent the released ammonia from escaping due to excessive flow rate.

[0047] Through two clearing operations, multiple ammonia spray nozzles on the same auxiliary pipeline are cleaned in batches to improve the clearing efficiency. At the same time, the ammonia outlet is cleaned alternately to avoid the ammonia spray nozzles being completely blocked during cleaning, resulting in an improper ratio between the amount of ammonia sprayed and the amount of exhaust gas, which ultimately affects the denitrification efficiency and causes nitrogen emissions to fail to meet standards.

[0048] Reference Figure 1 、 Figure 8 and Figure 9 The anti-escape mechanism 4 includes a guide plate group 43 symmetrically arranged up and down with the ammonia injection mechanism 2 as the center, and an opening and closing adjustment component 42 symmetrically arranged on the inner wall of the flue 1 corresponding to the guide plate group 43. The opening and closing adjustment component 42 drives the guide plate group 43 to perform partial opening and closing adjustment to prevent ammonia escape and excessive exhaust gas during cleaning; the guide plate group 43 is rotatably connected between the left and right inner walls of the vertical section of the flue 1 through a torsion spring rod, and the inclination direction of the upper guide plate group 43 is opposite to that of the lower guide plate group 43. The left and right ends of the torsion spring rod are both sleeved with a gear ring 44.

[0049] Reference Figures 8 to 10 The opening and closing adjustment component 42 includes an inverted T-shaped piece 421 that is connected to the inner wall of the flue 1 by a second spring (not shown in the figure) for sliding up and down. The upper part of the front side wall of the vertical section of the inverted T-shaped piece 421 is inclined. The inverted T-shaped piece 421 is used to push the guide plate group 43 for partial closing adjustment during cleaning operation; the inner wall of the flue 1 is connected to a rake-shaped piece 423 that is slidable up and down by a third spring (not shown in the figure). The vertical section of the rake-shaped piece 423 is fixedly connected to a wedge-shaped block 1 422. The rake-shaped piece 423 engages with the second gear ring 44 through the installed rack 2 424 to lock the inclination angle of the torsion spring rod and the guide plate group 43.

[0050] Reference Figures 8 to 10 The anti-escape mechanism 4 also includes a driving member 41 symmetrically arranged at the left and right ends of the support frame 31 through an electric push rod. The driving member 41 is composed of a trapezoidal plate fixedly connected to the support frame 31 and a wedge block 2 corresponding to the wedge block 1 422 fixed to the side wall of the trapezoidal plate through an L-shaped plate. The side of the trapezoidal plate close to the inverted T-shaped member 421 is inclined to match it.

[0051] The rake-shaped member 423 is pulled by the spring three to make the rack two 424 engage with the gear ring two 44, thereby limiting and locking the torsion spring rod and the guide plate group 43. In the initial state, the adjacent blades in the guide plate group 43 are not in contact with each other. The lower guide plate group 43 guides and evenly diverts the exhaust gas, and the upper guide plate group 43 guides and evenly diverts the mixed gas of ammonia and exhaust gas.

[0052] When the support frame 31 slides from front to back, it drives the driving member 41 to move, and the driving member 41 approaches the corresponding opening and closing adjustment component 42. The wedge block 2 approaches the wedge block 1 422. After the inclined surface of the wedge block 2 pushes the inclined surface of the wedge block 1 422, it drives the wedge block 1 422 and the rake-shaped member 423 to move away from the guide plate group 43. The rake-shaped member 423 and the rack 2 424 release the limit on the gear ring 2 44 and the torsion spring rod of the guide plate group 43.

[0053] Then, the inclined surface of the trapezoidal plate approaches and pushes the corresponding inverted T-shaped piece 421 to move in the direction of the guide plate group 43. The horizontal section of the inverted T-shaped piece 421 pushes the unlocked guide plate group 43, and the guide plate group 43 deflects and the torsion spring rod rotates. The adjacent blades of the guide plate group 43 gradually change to a state close to each other, so as to reduce the exhaust gas directly entering the cleaning area when the ammonia spraying mechanism 2 is cleaning, and at the same time reduce the outflow of the mixed gas of ammonia and exhaust gas. The gas buffer space formed by the change of the upper and lower corresponding guide plate groups 43 blades changes the opening and closing of the upper and lower corresponding guide plate groups 43 blades as the cleanable position changes, so as to prevent the amount of ammonia sprayed from being reduced during cleaning while the exhaust gas continues to enter, resulting in excessive exhaust gas, and then causing local uneven mixing.

[0054] It should be noted that protective covers are symmetrically and detachably installed on the inner wall of the vertical section of the flue 1 to protect the left and right ends of the support frame 31 and the opening and closing adjustment component 42, thereby reducing corrosion and impact caused by long-term use.

[0055] The specific operating steps of this flue gas denitrification device are as follows:

[0056] When cleaning multiple ammonia spray nozzles on a single auxiliary pipeline, the circular frame 351 drives the cleaning cylinder 325 to move downward into the corresponding ammonia outlet, scrapes off some impurities on the inner wall of the corresponding ammonia outlet, and the cleaning plug 327 pushes the impurities inside the cleaning cylinder 325 downward and discharges them out of the interior of the cleaning cylinder 325, and corresponds to the other part of the uncleaned ammonia outlet up and down through the diffuser cover group 33, so that part of the ammonia is diffused circumferentially through the bottom wall of the diffuser cover group 33, and part of the ammonia is diffused and diverted through the middle dispersion disk of the diffuser cover group 33; multiple ammonia spray nozzles on the same auxiliary pipeline are batch cleaned through two cleaning operations.

[0057] When the support frame 31 slides from front to back and the cleaning mechanism 3 performs batch cleaning on the ammonia spraying mechanism 2, the adjacent blades of the upper and lower corresponding guide plate groups 43 are driven to gradually change to a state close to each other, thereby reducing the direct entry of exhaust gas into the cleaning area and reducing the outflow of the mixed gas of ammonia and exhaust gas. The changes in the blades of the upper and lower corresponding guide plate groups 43 form a gas buffer space.

[0058] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A flue gas denitrification device, comprising a flue, characterized in that: The flue is in an inverted L-shape, and an ammonia spraying mechanism is provided in the middle of the vertical section of the flue. The ammonia spraying mechanism is composed of a main pipe mounted on the rear side wall of the flue in a front-to-back direction and a plurality of auxiliary pipes evenly distributed on the main pipe in a left-to-right direction. A plurality of ammonia spraying nozzles are installed on the top wall of the auxiliary pipes, and a plurality of ammonia outlets are opened on the ammonia spraying nozzles along the circumference. A cleaning mechanism is provided in the middle of the vertical section of the flue and is located above the ammonia spraying mechanism. An anti-escape mechanism is provided on both the flue and the cleaning mechanism. The cleaning mechanism includes a support frame connected to the left and right side walls of the middle part of the vertical section of the flue by an electric slider that slides back and forth. The support frame is provided with a cleaning assembly corresponding to the ammonia spray nozzle. The cleaning assembly is used to alternately clear blockages of multiple ammonia outlets on the same ammonia spray nozzle. The cleaning assembly is provided with a flow diffuser group. The flow diffuser group is used to expand and reduce the speed of multiple ammonia outlets at non-clearing stations. The anti-escape mechanism includes a guide plate group symmetrically arranged vertically with the ammonia injection mechanism as the center, and an opening and closing adjustment component symmetrically arranged on the inner wall of the flue and corresponding to the guide plate group. The opening and closing adjustment component drives the guide plate group to partially open and close to prevent ammonia escape and excessive exhaust gas during cleaning; When the support frame slides from front to back and the cleaning mechanism cleans the ammonia spraying mechanism in batches, the adjacent blades of the upper and lower corresponding guide plate groups are driven to gradually change to a state close to being in contact.

2. A flue gas denitrification device according to claim 1, characterized in that: The cleaning component includes a gear ring 1, the middle part of the support frame is in the shape of a circular frame, and the circular frame is evenly rotated from left to right with multiple gear rings corresponding to the ammonia spray nozzles connected, the inner ring wall of the gear ring 1 is fixedly connected to the support rod, and the top wall of the support rod is connected to the X-shaped frame through a spring rod.

3. A flue gas denitrification device according to claim 2, characterized in that: A protrusion is fixedly connected to the middle of the top wall of the X-shaped frame, and the four corners of the bottom wall of the X-shaped frame are fixedly connected to the clearing cylinders corresponding to the ammonia outlets. The inside of the clearing cylinders is connected to the clearing plugs for sliding up and down, and the top walls of multiple clearing plugs are fixedly connected to a lower pressure frame, which is connected to the X-shaped frame by a spring for sliding up and down.

4. A flue gas denitrification device according to claim 2, characterized in that: The inner ring wall of the gear ring 1 is symmetrically fixed with a diffuser group corresponding to the ammonia outlet through an extension plate with the support rod as the center, and the diffuser group is in an inverted cone shape. A dispersion disk with several through holes is fixed in the middle of the diffuser group.

5. The flue gas denitrification device according to claim 3, characterized in that: The support frame is provided with a rack and a driving mechanism for driving the cleaning component to operate. The support frame is connected to a rack that is meshed with a gear ring in front and back correspondingly through an electric slider that slides left and right. The rack slides through the circular frame.

6. A flue gas denitrification device according to claim 5, characterized in that: The driving mechanism includes a circular frame, the top wall of which is connected to the circular frame by an electric slider for sliding up and down, and the top wall of the circular frame is fixedly connected to a connecting plate corresponding to the X-shaped frame, and the bottom wall of the connecting plate is fixedly connected to a pressing round block corresponding to the protrusion and a pressing square group corresponding to the lower pressure frame.

7. The flue gas denitrification device according to claim 1, characterized in that: The guide plate group is rotatably connected between the left and right inner walls of the vertical section of the flue through a torsion spring rod. The inclination direction of the upper guide plate group is opposite to that of the lower guide plate group. The left and right ends of the torsion spring rod are both sleeved with gear ring 2.

8. The flue gas denitrification device according to claim 1, characterized in that: The opening and closing adjustment component includes an inverted T-shaped piece connected to the inner wall of the flue by sliding up and down through spring 2, and the upper part of the front side wall of the vertical section of the inverted T-shaped piece is inclined. The inverted T-shaped piece is used to push the guide plate group for partial closing adjustment during cleaning operations.

9. The flue gas denitrification device according to claim 7, characterized in that: The inner wall of the flue is connected to a rake-shaped member by sliding up and down through spring three, and the vertical section of the rake-shaped member is fixedly connected to a wedge-shaped block one. The rake-shaped member locks the inclination angle of the torsion spring rod and the guide plate group by engaging with the installed rack two and the gear ring two.

10. The flue gas denitrification device according to claim 9, characterized in that: The anti-escape mechanism also includes a driving member symmetrically arranged at the left and right ends of the support frame through an electric push rod. The driving member consists of a trapezoidal plate fixedly connected to the support frame and a wedge block 2 corresponding to the wedge block 1 fixed to the side wall of the trapezoidal plate through an L-shaped plate, and the side of the trapezoidal plate close to the inverted T-shaped member is inclined to match it.

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