Ash removal device for preventing flue gas denitration inlet flue from being blocked by accumulated ash

Abstract

The invention provides an ash removal device for preventing ash deposition and blockage of a flue gas denitration inlet flue, and relates to the technical field of flue gas treatment equipment.The ash removal device comprises a partial pressure dredging assembly 3, an ammonia spraying and mixing mechanism 6, an ash removal mechanism 7 and a controller 8, the right end of a flue gas outlet of a boiler 1 is fixedly communicated with a pipeline assembly 2, and the partial pressure dredging assembly 3 is fixedly arranged in the pipeline assembly 2; and an ammonia spraying and mixing mechanism 6 is fixedly arranged in the top of the pipeline assembly 2, an ash removal mechanism 7 is fixedly arranged at the bottom of the pipeline assembly 2, and the partial pressure dredging assembly 3, the ammonia spraying and mixing mechanism 6 and the ash removal mechanism 7 are electrically connected with a controller 8. Uniform cross section flue gas in partitions is realized through partition transformation, and uniform nitrogen oxide at a denitration outlet of the special-shaped flue is ensured by arranging partition valves and a denitration ammonia spraying main valve, so that ammonia escape is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas treatment equipment, and in particular to a dust removal device for preventing dust accumulation and blockage of a flue duct at an inlet of a flue gas denitration system. Background Art

[0002] Flue gas denitrification technology is one of the important technologies in the field of flue gas treatment, which is used to remove nitrogen oxides from flue gas. Flue gas denitrification technology includes a variety of methods, such as adsorption, absorption and selective catalytic reduction (SCR). Among them, SCR flue gas denitrification technology is widely used in industrial fields such as coal-fired power plants due to its high efficiency and stability.

[0003] However, in actual applications, according to research, the main reason for the blockage of air preheaters and low-temperature economizers of thermal power generating units is the ash sticking after ammonium bisulfate, and the currently commonly used SCR denitrification device, whether using liquid ammonia or urea, will inevitably produce ammonium bisulfate. The main reason for the production of ammonium bisulfate in the SCR denitrification device is that the cross-section of the flue gas at the ammonia spraying grid at the denitrification inlet is relatively uneven under the condition of uneven flue gas. In some areas, due to the small amount of flue gas and high ammonia spraying, the ammonia escape increases, and the air preheater is blocked. The horizontal flue at the entrance of the SCR flue gas denitrification device is prone to ash accumulation and blockage.

[0004] Especially when running at low load, the flue gas velocity is low, which makes it easy for dust to settle in the flue, which not only affects the operating efficiency and stability of the SCR device, but also may cause safety hazards. Therefore, it is particularly important to develop a dust removal device that can effectively prevent the flue from being blocked by dust accumulation. Summary of the invention

[0005] The present invention provides an ash removal device for preventing ash accumulation and blockage of a flue duct at an inlet of flue gas denitration, so as to solve the technical problems raised by the above-mentioned background technology.

[0006] In order to solve the above technical problems, the present invention provides an ash removal device for preventing ash accumulation and blockage in the flue of the flue gas denitrification inlet, comprising: a boiler, a pipeline assembly, a pressure-dividing and purge assembly, an ammonia spraying and mixing mechanism, an ash removal mechanism and a controller. The right end of the smoke outlet of the boiler is fixedly connected to the pipeline assembly, a pressure-dividing and purge assembly is fixedly provided inside the pipeline assembly, an ammonia spraying and mixing mechanism is fixedly provided on the top of the pipeline assembly, and an ash removal mechanism is fixedly provided on the bottom of the pipeline assembly. The pressure-dividing and purge assembly, the ammonia spraying and mixing mechanism and the ash removal mechanism are electrically connected to the controller respectively.

[0007] Preferably, the pipeline assembly includes: a horizontal pipeline 1, the right end of the smoke outlet of the boiler is fixedly connected to the horizontal pipeline 1, the right end of the horizontal pipeline 1 is fixedly connected to a right-angle bend pipe 1, the top of the right-angle bend pipe 1 is fixedly connected to a vertical pipe 1, the top of the vertical pipe 1 is fixedly connected to a right-angle bend pipe 2, the right end of the right-angle bend pipe 2 is fixedly connected to a catalytic reaction box, and a plurality of deoxidized catalytic layers are fixedly provided in the catalytic reaction box.

[0008] Preferably, the pressure dividing and diversion assembly includes: a pressure dividing baffle, two pressure dividing baffles are fixedly installed symmetrically along the front and back inside the connection between the horizontal pipe 1 and the right-angle bend pipe 1, and the pressure dividing baffle divides the internal space of the horizontal pipe 1 and the right-angle bend pipe 1 into three equal parts along the front and back direction; a plurality of vertical short guide plates 1 are fixedly installed on the left side inside the horizontal pipe 1 along the front and back direction, and a plurality of vertical short guide plates 2 are fixedly installed on the right side inside the horizontal pipe 1 along the front and back direction.

[0009] Preferably, the corner of the right-angle bend pipe is rotatably connected to a rotating shaft in the front-to-back direction, three arc guide plates are fixedly installed on the rotating shaft at equal intervals, a turbine is fixedly installed at the front end of the rotating shaft, a stack of fixed plates are symmetrically fixedly installed at the front end of the outer wall of the right-angle bend pipe, the center of the upper and lower fixed plates are rotatably connected to a worm gear, and the top of the worm gear is fixedly connected to the output shaft end of a servo motor.

[0010] Preferably, an inclined guide plate five is fixedly installed at the right end of the inside of the right-angle bend pipe two, and the corner of the right-angle bend pipe two is rotatably connected to a plurality of arc guide plates two along the diagonal direction, the front end of the axis of the arc guide plate two is fixedly connected to a worm gear two, the worm gear two is meshingly connected to a worm two, the left end of the worm gear two is fixedly connected to the output shaft end of the servo motor two, and the servo motor two is fixedly connected to the front wall of the right-angle bend pipe two.

[0011] Preferably, the ammonia spray mixing mechanism comprises: an ammonia spray grid, a layer of ammonia spray grid is fixedly connected to the middle part of the vertical pipe one, the ammonia spray grid is installed in three equal areas front and back, the right end of the ammonia spray grid in each area is fixedly connected to a spray pipe, the spray pipe is fixed to the right and passes through the right side wall of the vertical pipe one, a partition valve is fixedly installed on the right end of each spray pipe, the right end of the spray pipe is fixedly connected to a main pipe, a main valve is fixedly installed on the main pipe, the other end of the main pipe is fixedly connected to a general ammonia supply equipment, and three rotating shafts are rotatably connected along the left and right directions above the ammonia spray grid in the vertical pipe one.

[0012] Preferably, a plurality of mixing blades are alternately fixedly installed on the upper and lower parts of the rotating shaft, the left end of each rotating shaft is fixedly connected to a pulley 1, a motor bracket is fixedly installed on the left outer wall of the vertical tube 1, a mixing motor is fixedly installed on the left end of the motor bracket, an output shaft end of the mixing motor is fixedly connected to pulley 2, the right end of the axis of pulley 2 is rotatably connected to the left outer wall of the vertical tube 1, pulley 2 is connected to pulley 1 through a belt 1, and a layer of static mixer is fixedly installed on the top of the vertical tube 1.

[0013] Preferably, the dust removal mechanism includes: the right end of the bottom of the right-angle bend pipe 1 is fixedly connected to the box body 1, the left end of the box body 1 is slidably connected to the sealing plate at the connection between the right-angle bend pipe 1 and the box body 1, an electric telescopic rod is fixedly installed on the top of the sealing plate, and the left end of the electric telescopic rod is fixedly connected to the outer wall of the vertical pipe 1; the top of the box body 1 is rotatably connected to the screw 1 along the left and right directions, the right end of the screw 1 is fixedly connected to the output shaft end of the motor 3, and the screw 1 is threadedly connected to the L-shaped bracket; the left end of the L-shaped bracket is rotatably connected to the cleaning roller along the front and back directions, and the L-shaped bracket is fixedly provided with an elastic scraper, the front end of the cleaning roller is fixedly connected to the bevel gear 1, the bevel gear 1 is meshedly connected to the bevel gear 2, the right end of the bevel gear 2 is fixedly connected to the output shaft end of the motor 4, and the bottom of the box body 1 is fixedly connected to the collection box.

[0014] Preferably, a hybrid anomaly detection alarm module is further provided, and the hybrid anomaly detection alarm module includes:

[0015] Density sensor 1, used to detect the density of smoke at the inlet of horizontal pipe 1;

[0016] Density sensor 2, used to detect the density of smoke at the outlet of vertical pipe 1;

[0017] Density sensor three, used to detect the density value of liquid ammonia in the spray pipe;

[0018] Pressure sensor 1, used to detect the pressure value of liquid ammonia at the inlet of the spray pipe;

[0019] Pressure sensor 2, used to detect the pressure value of liquid ammonia at the nozzle of the ammonia spray grid;

[0020] A flow rate sensor, used to detect the flue gas flow rate value in the pipeline assembly;

[0021] Calculation module 1, used to calculate the predicted value of the average particle size of the nozzle spray of the ammonia injection grid;

[0022] Calculation module 2 is used to calculate the abnormal evaluation coefficient of the mixture of liquid ammonia spray and flue gas;

[0023] Alarm, used to give an alarm in abnormal state;

[0024] A control unit is used for centralized control and data processing, and regularly detects the inside of the pipeline assembly at set time intervals. Density sensor 1, density sensor 2, density sensor 3, pressure sensor 1, pressure sensor 2, calculation module 1, and calculation module 2 are all electrically connected to the control unit;

[0025] The comparison and judgment module is used to compare the abnormal evaluation coefficient of the mixture of liquid ammonia spray and flue gas with the preset evaluation range to determine whether it is abnormal.

[0026] Preferably, it also includes:

[0027] The calculation module 1 performs calculation based on the following formula 1;

[0028]

[0029] Where: SMD is the predicted value of the average particle size of the nozzle spray of the ammonia injection grid, σ is the surface tension of liquid ammonia, μ 1 is the viscosity of liquid ammonia, ρ 1 is the density of the flue gas at the inlet of the horizontal duct detected by density sensor 1, ρ 2 is the density of the flue gas at the outlet of the vertical pipe 1 detected by density sensor 2, r y is the thickness of the liquid ammonia film at the nozzle outlet, cos is the cosine function, θ is the semi-cone angle of the spray, ρ y is the density value of liquid ammonia detected by density sensor 3, P 3 is the pressure value of liquid ammonia at the inlet of the spray pipe detected by pressure sensor 1, P 4 The pressure value of liquid ammonia at the nozzle of the ammonia injection grid detected by pressure sensor 2;

[0030] The calculation module 2 is calculated based on the following formula 2:

[0031] Where: K is the abnormal assessment coefficient of the mixture of liquid ammonia spray and flue gas, v y is the average flue gas flow rate detected by the flow rate sensor, v 1 is the flue gas velocity value at the inlet of the horizontal pipe detected by the velocity sensor, v 2 is the flue gas velocity value at the outlet of the vertical pipe detected by the velocity sensor, is the flue gas dynamic pressure value at the vertical pipe outlet, is the flue gas dynamic pressure value at the inlet of the horizontal duct, μ y is the dynamic viscosity coefficient of flue gas, P 1 is the flue gas static pressure value detected by the pressure sensor at the inlet of the horizontal pipe, P 2 is the flue gas static pressure value detected by the pressure sensor at the outlet of the vertical pipe, a p is the static mixer width, δ pis the thickness of the static mixer, b p is the distance between adjacent static mixers;

[0032] Comparison and judgment module, if K is within the preset evaluation range, the alarm will not sound; when K is less than the preset evaluation range, the control unit increases the input pressure of the spray pipe until it reaches the preset evaluation range; when K exceeds the maximum value of the preset evaluation range, the control unit controls the alarm to sound an abnormal alarm, and promptly closes the main valve for ammonia spraying for maintenance.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides an ash removal device for preventing the inlet flue of flue gas denitrification from being blocked by ash accumulation. The flue gas generated by the boiler enters the pipeline assembly, and the pressure distribution and diversion assembly arranged inside the pipeline assembly can evenly distribute the flue gas flow, reduce eddy currents and dead corners, and reduce the risk of ash accumulation. The ammonia spray mixing mechanism is responsible for evenly spraying liquid ammonia into the flue gas to achieve effective mixing of ammonia. The ash removal mechanism removes the ash at the bottom of the pipeline assembly regularly or as needed to prevent blockage. All components are uniformly controlled by a controller to ensure the coordinated operation of the entire system. The present invention provides a new zoning scheme for special-shaped flues. The cross-sectional flue gas is uniform within the partition through zoning transformation, and zoning valves and denitrification ammonia spray main valves are arranged to ensure that nitrogen oxides at the denitrification outlet of the special-shaped flue evenly reduce ammonia escape.

[0034] Beneficial effects:

[0035] Improve denitrification efficiency: The numerical simulation results of the flow field show that the flow velocity in the three partitions of the cross section in front of the catalyst is very uniform, and the airflow distribution coefficient is less than 10%, indicating that the airflow diffuses horizontally in the area after ammonia injection, making the flow rate and flow velocity in the three areas tend to be consistent. The partial pressure guidance component ensures uniform distribution of flue gas, which is conducive to the full mixing of ammonia and improves the denitrification efficiency.

[0036] Reduce dust accumulation and blockage: The dust removal mechanism regularly removes dust accumulation to reduce the risk of pipeline blockage and ensure stable operation of the system.

[0037] Intelligent control: The controller realizes the coordinated operation of various components to improve the automation and intelligence level of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0039] Figure 1 It is a front cross-sectional schematic diagram of a ash removal device for preventing ash accumulation and blockage of a flue gas denitration inlet flue according to the present invention;

[0040] Figure 2 It is a front view schematic diagram of the connection of the right-angle elbow pipe 1, the vertical pipe 1 and the right-angle elbow pipe 2 of the present invention;

[0041] Figure 3 This Figure 1 A partial enlarged view of the middle part;

[0042] Figure 4 It is a left side schematic diagram of the ammonia spraying and mixing mechanism of the present invention;

[0043] Figure 5 It is a front sectional schematic diagram of the dust removal mechanism of the present invention.

[0044] Reference numerals:

[0045] 1. Boiler; 2. Pipeline assembly; 21. Horizontal pipeline 1; 22. Right-angle elbow 1; 23. Vertical pipe 1; 24. Right-angle elbow 2; 25. Catalytic reaction box; 26. Catalytic layer; 3. Pressure distribution and diversion assembly; 31. Pressure distribution partition; 32. Short guide plate 1; 33. Short guide plate 2; 34. Rotating shaft 1; 35. Arc guide plate 1; 36. Turbine 1; 37. Fixed plate 1; 38. Worm 1; 39. Servo motor 1; 4. Oblique guide plate 5; 5. Arc guide plate 2; 51. Worm gear 2; 52. Worm gear 2; 53. Servo motor 2; 6. Ammonia injection mixing mechanism; 61. Ammonia injection grid; 62 , spray pipe; 63, partition valve; 64, main pipe; 65, main valve; 66, ammonia supply equipment; 67, rotating shaft; 68, mixing blades; 69, pulley one; 610, motor bracket; 611, mixing motor; 612, pulley two; 613, belt one; 614, static mixer; 7, dust removal mechanism; 71, box one; 72, blocking plate; 73, electric telescopic rod; 74, screw one; 75, motor three; 76, L-shaped bracket; 77, cleaning roller; 78, elastic scraper; 79, bevel gear one; 710, bevel gear two; 711, motor four; 712, collection box; 8, controller. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0047] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0048] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0049] The present invention provides the following embodiments

[0050] Example 1

[0051] The embodiment of the present invention provides a dust removal device for preventing dust accumulation and blockage of the flue gas denitrification inlet. Figure 1 As shown, it includes: a pressure-dividing and guiding component 3, an ammonia spraying and mixing mechanism 6, an ash removal mechanism 7 and a controller 8. The right end of the smoke outlet of the boiler 1 is fixedly connected to the pipeline component 2, the pipeline component 2 is fixedly provided with a pressure-dividing and guiding component 3, the top of the pipeline component 2 is fixedly provided with an ammonia spraying and mixing mechanism 6, and the bottom of the pipeline component 2 is fixedly provided with an ash removal mechanism 7. The pressure-dividing and guiding component 3, the ammonia spraying and mixing mechanism 6 and the ash removal mechanism 7 are electrically connected to the controller 8 respectively.

[0052] The working principle and beneficial effects of the above technical solution are as follows: the ash removal device provided by the present invention prevents the flue gas denitrification inlet from being blocked by ash accumulation. The flue gas generated by the boiler 1 enters the pipe assembly 2. The pressure distribution and diversion assembly 3 arranged inside the pipe assembly 2 can evenly distribute the flue gas flow, reduce eddy currents and dead corners, and reduce the risk of ash accumulation. The ammonia spray mixing mechanism 6 is responsible for evenly spraying liquid ammonia into the flue gas to achieve effective mixing of ammonia. The ash removal mechanism 7 regularly or as needed removes the ash at the bottom of the pipe assembly 2 to prevent blockage. All components are uniformly controlled by the controller 8 to ensure the coordinated operation of the entire system. The present invention provides a new zoning scheme for special-shaped flues. The cross-sectional flue gas is uniform within the partition through zoning transformation, and a zoning valve 63 and a denitrification ammonia spray main valve 65 are provided to ensure that nitrogen oxides at the denitrification outlet of the special-shaped flue evenly reduce ammonia escape.

[0053] Beneficial effects:

[0054] Improve denitrification efficiency: The numerical simulation results of the flow field show that the flow velocity in the three partitions of the cross section in front of the catalyst is very uniform, and the airflow distribution coefficient is less than 10%, indicating that the airflow has horizontal diffusion in the area after the ammonia injection, making the flow rate and flow velocity in the three areas tend to be consistent. The partial pressure diversion component 3 ensures uniform distribution of the flue gas, which is conducive to the full mixing of ammonia and improves the denitrification efficiency.

[0055] Reduce dust accumulation and blockage: The dust removal mechanism 7 regularly removes dust accumulation to reduce the risk of pipeline blockage and ensure stable operation of the system.

[0056] Intelligent control: The controller 8 realizes the coordinated operation of each component and improves the automation and intelligence level of the system.

[0057] Example 2

[0058] On the basis of Example 1, Figure 1 , Figure 2 As shown, the pipeline assembly 2 includes: a horizontal pipeline 21, the right end of the smoke outlet of the boiler 1 is fixedly connected to the horizontal pipeline 21, the right end of the horizontal pipeline 21 is fixedly connected to a right-angle bend pipe 22, the top of the right-angle bend pipe 22 is fixedly connected to a vertical pipe 23, the top of the vertical pipe 23 is fixedly connected to a right-angle bend pipe 24, the right end of the right-angle bend pipe 24 is fixedly connected to a catalytic reaction box 25, and a plurality of de-catalyzed catalytic layers 26 are fixedly provided in the catalytic reaction box 25.

[0059] The pressure-dividing and diverting assembly 3 includes: a pressure-dividing baffle 31, two pressure-dividing baffles 31 are symmetrically fixedly installed inside the connection between the horizontal pipe 21 and the right-angle bend pipe 22 along the front-to-back direction, and the pressure-dividing baffle 31 divides the internal space of the horizontal pipe 21 and the right-angle bend pipe 22 into three equal parts along the front-to-back direction; a plurality of vertical short guide plates 32 are fixedly installed on the left side inside the horizontal pipe 21 along the front-to-back direction, and a plurality of vertical short guide plates 33 are fixedly installed on the right side inside the horizontal pipe 21 along the front-to-back direction.

[0060] The corner of the right-angle bend pipe 22 is rotatably connected to a rotating shaft 34 in the front-to-back direction, three arc guide plates 35 are fixedly installed on the rotating shaft 34 at equal intervals in the front and back, a turbine 36 is fixedly installed at the front end of the rotating shaft 34, and a stack of fixed plates 37 are symmetrically fixedly installed on the front end of the outer wall of the right-angle bend pipe 22, and the centers of the upper and lower fixed plates 37 are rotatably connected to a worm gear 38, and the top end of the worm gear 38 is fixedly connected to the output shaft end of a servo motor 39.

[0061] An inclined guide plate 5 4 is fixedly installed at the right end of the right angle bend pipe 24. The corner of the right angle bend pipe 24 is rotatably connected to a plurality of arc guide plates 2 5 along the diagonal direction. The front end of the axis of the arc guide plate 25 is fixedly connected to a worm gear 2 51. The worm gear 2 51 is meshingly connected to a worm 2 52. The left end of the worm 2 52 is fixedly connected to the output shaft end of a servo motor 2 53. The servo motor 2 53 is fixedly connected to the front wall of the right angle bend pipe 24.

[0062] The working principle and beneficial effects of the above technical solution are as follows: Working principle:

[0063] On the basis of Example 1, the pipe assembly 2 is designed in detail to include a horizontal pipe 1 21, a right-angle bend pipe 1 22, a vertical pipe 1 23 and a right-angle bend pipe 2 24, etc., to form a complex flue gas channel. The pressure-dividing and diverting assembly 3 realizes uniform distribution and diversion of flue gas, reduces eddy currents and dead corners, and further reduces the risk of ash accumulation through the cooperation of the pressure-dividing partition 31, the short guide plate 1 32, the short guide plate 2 33, the arc guide plate 1 35 and its driving mechanism (turbine 1 36, worm 1 38, servo motor 1 39, etc.) and the arc guide plate 2 5 and its driving mechanism (worm gear 2 51, worm 2 52, servo motor 2 53, etc.).

[0064] Beneficial effects:

[0065] Optimizing flue gas flow: The design of the pressure distribution and drainage component 3 makes the flue gas flow in the pipe component 2 more uniform, reduces eddy currents and dead corners, and helps reduce ash accumulation.

[0066] Improve system stability: By precisely controlling the angle and position of the guide plate, it can adapt to the flue gas flow requirements under different working conditions and improve the stability and adaptability of the system.

[0067] Intelligent adjustment: The addition of driving mechanisms such as servo motors allows the angle of the guide plate to be automatically adjusted, improving the intelligence level of the system.

[0068] Example 3

[0069] On the basis of Example 2, Figure 1 , Figure 3 As shown, the ammonia spray mixing mechanism 6 includes: an ammonia spray grid 61, a layer of ammonia spray grid 61 is fixedly connected to the middle part of the vertical pipe 23, the ammonia spray grid 61 is equally divided into three areas front and back, the right end of the ammonia spray grid 61 in each area is fixedly connected to a spray pipe 62, the spray pipe 62 is fixed to the right and penetrates the right side wall of the vertical pipe 23, each spray pipe 62 is fixedly installed with a partition valve 63 on the right end, the right end of the spray pipe 62 is fixedly connected to a main pipe 64, a main valve 65 is fixedly installed on the main pipe 64, the other end of the main pipe 64 is fixedly connected to a general ammonia supply device 66, and three rotating shafts 67 are rotatably connected along the left and right directions above the ammonia spray grid 61 in the vertical pipe 23.

[0070] The rotating shaft 67 is fixedly installed with a plurality of mixing blades 68 alternately up and down, and the left end of each rotating shaft 67 is fixedly connected to a pulley 69. The left outer wall of the vertical pipe 23 is fixedly installed with a motor bracket 610, and the left end of the motor bracket 610 is fixedly installed with a mixing motor 611. The output shaft end of the mixing motor 611 is fixedly connected to a pulley 2 612. The right end of the axis of the pulley 2 612 is rotatably connected to the left outer wall of the vertical pipe 23. The pulley 2 612 is connected to the pulley 1 69 through a belt 1 613. The vertical pipe 23 is located on the top of the rotating shaft 67 and a static mixer 614 is fixedly installed.

[0071] The working principle and beneficial effects of the above technical solution are:

[0072] Working principle:

[0073] On the basis of Example 2, the ammonia spraying and mixing mechanism 6 is designed in detail to include an ammonia spraying grid 61, a spray pipe 62, a partition valve 63, a main pipe 64, a main valve 65, a rotating shaft 67, a mixing blade 68, a pulley 1 69, a mixing motor 611, a pulley 2 612 and a static mixer 614. Liquid ammonia enters the main pipe 64 through the ammonia supply device 66, and is evenly sprayed onto the ammonia spraying grid 61 through the partition valve 63 and the spray pipe 62 to mix with the flue gas. The rotation of the rotating shaft 67 and the mixing blade 68 further promotes the mixing of ammonia and flue gas. The static mixer 614 provides an additional mixing effect.

[0074] Beneficial effects:

[0075] Improve mixing efficiency: The cooperation between the ammonia spray grid 61 and the spray pipe 62 enables liquid ammonia to be evenly sprayed into the flue gas. The rotation of the rotating shaft 67 and the mixing blades 68 further promotes the mixing of ammonia and flue gas, thereby improving the mixing efficiency.

[0076] Flexible adjustment: The setting of the partition valve 63 makes it possible to adjust the ammonia injection amount in different areas according to actual needs, thereby improving the flexibility of the system.

[0077] Enhanced mixing effect: The addition of the static mixer 614 provides an additional mixing effect, making the mixing of ammonia and flue gas more complete.

[0078] Example 4

[0079] On the basis of Example 2, Figure 1 , Figure 3 and Figure 5As shown, the dust removal mechanism 7 includes: the right end of the bottom of the right-angle bend pipe 22 is fixedly connected to the box body 71, the left end of the box body 71 is connected to the right-angle bend pipe 22 at a connection point where it slides up and down to connect the blocking plate 72, the top of the blocking plate 72 is fixedly installed with an electric telescopic rod 73, the left end of the electric telescopic rod 73 is fixedly connected to the outer wall of the vertical pipe 23, the top of the box body 71 is rotatably connected to the lead screw 74 along the left and right directions, the right end of the lead screw 74 is fixedly connected to the output shaft end of the motor three 75, and the lead screw is threadedly connected to the L-shaped bracket 76; the left end of the L-shaped bracket 76 is rotatably connected to the cleaning roller 77 along the front and rear directions, the L-shaped bracket 76 is fixedly provided with an elastic scraper 78, the front end of the cleaning roller 77 is fixedly connected to the bevel gear 1 79, the bevel gear 1 79 is meshedly connected to the bevel gear 2 710, the right end of the bevel gear 2 710 is fixedly connected to the output shaft end of the motor four 711, and the bottom of the box body 71 is fixedly connected to the collection box body 712.

[0080] The working principle and beneficial effects of the above technical solution are:

[0081] Working principle:

[0082] On the basis of Example 2, the dust removal mechanism 7 is designed in detail to include a box body 71, a blocking plate 72, an electric telescopic rod 73, a lead screw 74, a motor 3 75, an L-shaped bracket 76, a cleaning roller 77, an elastic scraper 78 and a motor 4 711. The electric telescopic rod 73 drives the blocking plate 72 to slide up and down to control the opening and closing of the box body 71. The motor 3 75 drives the lead screw 1 74 to rotate, driving the L-shaped bracket 76 to move left and right. The cleaning roller 77 and the elastic scraper 78 are responsible for removing the dust accumulated at the bottom of the pipe. The motor 4 711 drives the cleaning roller 77 to rotate to improve the dust cleaning efficiency. The accumulated dust is collected in the collection box 712.

[0083] Beneficial effects:

[0084] Effectively remove dust accumulation: The cooperation between the cleaning roller 77 and the elastic scraper 78 enables dust accumulation to be effectively removed to prevent pipeline blockage.

[0085] High degree of automation: the addition of the electric telescopic rod 73, the motor three 75 and the motor four 711 makes the dust removal process more automated and intelligent.

[0086] Easy maintenance: The setting of the collection box 712 makes the collection and treatment of accumulated dust more convenient, thus reducing maintenance costs.

[0087] Example 5

[0088] On the basis of Example 2, a hybrid anomaly detection alarm module is further provided, and the hybrid anomaly detection alarm module includes:

[0089] Density sensor 1, used to detect the density of smoke at the inlet of horizontal pipe 1 21;

[0090] Density sensor 2, used to detect the density of smoke at the outlet of vertical pipe 1 23;

[0091] Density sensor three, used to detect the density value of liquid ammonia in the spray pipe 62;

[0092] Pressure sensor 1, used to detect the pressure value of liquid ammonia at the inlet of the spray pipe 62;

[0093] Pressure sensor 2, used to detect the pressure value of liquid ammonia at the nozzle of the ammonia spray grid 61;

[0094] A flow rate sensor, used to detect the flue gas flow rate value in the pipeline assembly 2;

[0095] Calculation module 1, used to calculate the predicted value of the average particle size of the nozzle spray of the ammonia injection grid 61;

[0096] Calculation module 2 is used to calculate the abnormal evaluation coefficient of the mixture of liquid ammonia spray and flue gas;

[0097] Alarm, used to give an alarm in abnormal state;

[0098] A control unit is used for centralized control and data processing, and regularly detects the inside of the pipeline assembly 2 at set time intervals. Density sensor 1, density sensor 2, density sensor 3, pressure sensor 1, pressure sensor 2, calculation module 1, and calculation module 2 are all electrically connected to the control unit;

[0099] The comparison and judgment module is used to compare the abnormal evaluation coefficient of the mixture of liquid ammonia spray and flue gas with the preset evaluation range to determine whether it is abnormal.

[0100] Also includes:

[0101] The calculation module 1 performs calculation based on the following formula 1;

[0102]

[0103] Where: SMD is the predicted value of the average particle size of the nozzle spray of the ammonia injection grid 61, σ is the surface tension of liquid ammonia, μ 1 is the viscosity of liquid ammonia, ρ 1 is the density of the flue gas at the inlet of the horizontal pipe 21 detected by the density sensor, ρ 2 is the density of the flue gas at the outlet of the vertical pipe 23 detected by the density sensor 2, r y is the thickness of the liquid ammonia film at the nozzle outlet, cos is the cosine function, θ is the semi-cone angle of the spray, ρ y is the density value of liquid ammonia detected by density sensor 3, P 3 is the pressure value of liquid ammonia at the inlet of the spray pipe 62 detected by pressure sensor 1, P4 is the pressure value of liquid ammonia at the nozzle of the ammonia injection grid 61 detected by the pressure sensor 2;

[0104] The calculation module 2 is calculated based on the following formula 2:

[0105] Where: K is the abnormal assessment coefficient of the mixture of liquid ammonia spray and flue gas, v y is the average flue gas flow rate detected by the flow rate sensor, v 1 is the flue gas velocity value at the inlet of horizontal pipe 21 detected by the velocity sensor, v 2 is the flue gas velocity value at the outlet of the vertical pipe 23 detected by the velocity sensor, is the flue gas dynamic pressure value at the outlet of vertical pipe 23, is the flue gas dynamic pressure value at the inlet of horizontal pipe 21, μ y is the dynamic viscosity coefficient of flue gas, P 1 is the flue gas static pressure value detected by the pressure sensor at the inlet of the horizontal pipe 21, P 2 is the flue gas static pressure value detected by the pressure sensor at the outlet of the vertical pipe 23, a p is the width of the static mixer 614, δ p is the thickness of the static mixer 614, b p is the distance between adjacent static mixers 614;

[0106] According to the comparison and judgment module, if K is within the preset evaluation range, the alarm will not sound. When K is less than the preset evaluation range, the control unit increases the input pressure of the spray pipe 62 until it reaches the preset evaluation range. When K exceeds the maximum value of the preset evaluation range, the control unit controls the alarm to sound an abnormal alarm, and promptly closes the main valve for ammonia injection for maintenance.

[0107] The working principle and beneficial effects of the above technical solution are:

[0108] Working principle:

[0109] On the basis of Example 2, a mixed abnormality detection alarm module is added, including density sensor 1, density sensor 2, density sensor 3, pressure sensor 1, pressure sensor 2, flow rate sensor, calculation module 1, calculation module 2, alarm and control unit. The density sensor and the pressure sensor detect the density and pressure values ​​of the flue gas and liquid ammonia respectively. The flow rate sensor detects the flue gas flow rate value in the pipeline component 2. The calculation module 1 calculates the predicted value of the nozzle spray average particle size of the ammonia spray grid 61 according to the formula. The calculation module 2 calculates the abnormal evaluation coefficient of the mixing of liquid ammonia spray and flue gas according to the formula. The control unit centrally controls and processes data, and determines whether to alarm according to the abnormal evaluation coefficient.

[0110] Beneficial effects:

[0111] Real-time monitoring of mixing status: The mixing anomaly detection alarm module can monitor the mixing status of liquid ammonia spray and flue gas in real time and detect anomalies in time.

[0112] Improve system safety: When a mixing anomaly is detected, the alarm will sound in time, and the control unit will take corresponding measures (such as increasing the input pressure of the spray pipe 62 or closing the main valve 65 for spraying ammonia) to prevent accidents.

[0113] High degree of intelligence: Through the cooperation of the computing module and the control unit, intelligent monitoring and control of the mixing state are realized.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dust removal device for preventing dust accumulation and blockage of the flue gas denitrification inlet, characterized in that: include: A pressure distribution and drainage component (3), an ammonia spray mixing mechanism (6), an ash removal mechanism (7) and a controller (8); the right end of the smoke outlet of the boiler (1) is fixedly connected to the pipeline component (2); the pressure distribution and drainage component (3) is fixedly arranged inside the pipeline component (2); the ammonia spray mixing mechanism (6) is fixedly arranged inside the top of the pipeline component (2); the ash removal mechanism (7) is fixedly arranged at the bottom of the pipeline component (2); the pressure distribution and drainage component (3), the ammonia spray mixing mechanism (6) and the ash removal mechanism (7) are respectively electrically connected to the controller (8).

2. The ash removal device for preventing ash accumulation and blockage of the flue gas denitrification inlet according to claim 1 is characterized in that: The pipeline assembly (2) comprises: a horizontal pipeline (21); the right end of the smoke outlet of the boiler (1) is fixedly connected to the horizontal pipeline (21); the right end of the horizontal pipeline (21) is fixedly connected to a right-angle bend pipe (22); the top of the right-angle bend pipe (22) is fixedly connected to a vertical pipeline (23); the top of the vertical pipeline (23) is fixedly connected to a right-angle bend pipe (24); the right end of the right-angle bend pipe (24) is fixedly connected to a catalytic reaction box (25); and a plurality of desulfurized catalytic layers (26) are fixedly provided in the catalytic reaction box (25).

3. The ash removal device for preventing ash accumulation and blockage of the flue gas denitrification inlet according to claim 2 is characterized in that: The pressure dividing and diverting component (3) comprises: a pressure dividing partition (31), wherein two pressure dividing partitions (31) are fixedly installed symmetrically in the front-to-back direction inside the connection between the horizontal pipe (21) and the right-angle bend pipe (22), and the pressure dividing partition (31) divides the internal space of the horizontal pipe (21) and the right-angle bend pipe (22) into three equal parts in the front-to-back direction; a plurality of vertical short flow guide plates (32) are fixedly installed in the left side inside the horizontal pipe (21) in the front-to-back direction, and a plurality of vertical short flow guide plates (33) are fixedly installed in the right side inside the horizontal pipe (21) in the front-to-back direction.

4. The ash removal device for preventing ash accumulation and blockage of the flue gas denitrification inlet according to claim 2 is characterized in that: The anti-blocking and drainage adjustment mechanism comprises: a rotating shaft (34), the corner of the right-angle bend pipe (22) is rotatably connected to the rotating shaft (34) in the front-to-back direction, three arc guide plates (35) are fixedly installed on the rotating shaft (34) at equal intervals in the front and back, a turbine (36) is fixedly installed at the front end of the rotating shaft (34), a stack of fixed plates (37) are symmetrically fixedly installed at the front end of the outer wall of the right-angle bend pipe (22), the centers of the upper and lower fixed plates (37) are rotatably connected to a worm gear (38), and the top end of the worm gear (38) is fixedly connected to the output shaft end of a servo motor (39).

5. The ash removal device for preventing ash accumulation and blockage of the flue gas denitrification inlet according to claim 4 is characterized in that: The right end of the right angle bend pipe 2 (24) is fixedly installed with an inclined guide plate 5 (4); the right angle bend pipe 2 (24) is rotatably connected to a plurality of circular arc guide plates 2 (5) at the corner along the diagonal direction; the front end of the axis of the circular arc guide plates 2 (5) is fixedly connected to a worm gear 2 (51); the worm gear 2 (51) is meshedly connected to a worm gear 2 (52); the left end of the worm gear 2 (52) is fixedly connected to the output shaft end of a servo motor 2 (53); and the servo motor 2 (53) is fixedly connected to the front wall of the right angle bend pipe 2 (24).

6. The ash removal device for preventing ash accumulation and blockage of the flue gas denitrification inlet according to claim 2 is characterized in that: The ammonia spray mixing mechanism (6) comprises: an ammonia spray grid (61), a layer of ammonia spray grid (61) is fixedly connected to the middle of the vertical pipe (23), the ammonia spray grid (61) is equally divided into three areas in front and back, the right end of the ammonia spray grid (61) in each area is fixedly connected to a spray pipe (62), the spray pipe (62) is fixedly penetrated to the right side wall of the vertical pipe (23), a partition valve (63) is fixedly installed on the right end of each spray pipe (62), the right end of the spray pipe (62) is fixedly connected to a main pipe (64), a main valve (65) is fixedly installed on the main pipe (64), and the other end of the main pipe (64) is fixedly connected to a general ammonia supply device (66), and three rotating shafts (67) along the left and right directions are rotatably connected in the vertical pipe (23) above the ammonia spray grid (61).

7. The ash removal device for preventing ash accumulation and blockage of the flue gas denitrification inlet according to claim 6 is characterized in that: include: The rotating shaft (67) is alternately fixedly installed with a plurality of mixing blades (68) up and down, and the left end of each rotating shaft (67) is fixedly connected to a pulley one (69). The left outer wall of the vertical tube one (23) is fixedly installed with a motor bracket (610). The left end of the motor bracket (610) is fixedly installed with a mixing motor (611). The output shaft end of the mixing motor (611) is fixedly connected to a pulley two (612). The right end of the axis of the pulley two (612) is rotatably connected to the left outer wall of the vertical tube one (23). The pulley two (612) is connected to the pulley one (69) via a belt one (613). The vertical tube one (23) is located at the top of the rotating shaft (67) and is fixedly installed with a layer of static mixer (614).

8. The ash removal device for preventing ash accumulation and blockage of the flue gas denitrification inlet according to claim 2 is characterized in that: The dust removal mechanism (7) comprises: the bottom of the right-angled bend pipe (22) has a right end fixedly connected to a box body (71); the left end of the box body (71) is connected to the right-angled bend pipe (22) by sliding up and down to connect a blocking plate (72); the top of the blocking plate (72) is fixedly installed with an electric telescopic rod (73); the left end of the electric telescopic rod (73) is fixedly connected to the outer wall of the vertical pipe (23); the top of the box body (71) is rotatably connected to a lead screw (74) along the left and right directions; the right end of the lead screw (74) is fixedly connected to a motor The output shaft end of the third (75) is connected to the screw rod one by threading with the L-shaped bracket (76); the left end of the L-shaped bracket (76) is rotatably connected to the cleaning roller (77) along the front-back direction, and the L-shaped bracket (76) is fixedly provided with an elastic scraper (78); the front end of the cleaning roller (77) is fixedly connected to the bevel gear one (79), the bevel gear one (79) is meshedly connected to the bevel gear two (710), and the right end of the bevel gear two (710) is fixedly connected to the output shaft end of the motor four (711), and the bottom of the box body one (71) is fixedly connected to the collection box body (712).

9. The ash removal device for preventing ash accumulation and blockage of the flue gas denitrification inlet according to claim 6 is characterized in that: A hybrid anomaly detection alarm module is also provided, which includes: Density sensor 1, used to detect the density of smoke at the inlet of horizontal duct 1 (21); Density sensor 2, used to detect the density of smoke at the outlet of vertical pipe 1 (23); Density sensor three, used for detecting the density value of liquid ammonia in the spray pipe (62); Pressure sensor 1, used for detecting the pressure value of liquid ammonia at the inlet of the spray pipe (62); A second pressure sensor, used for detecting the pressure value of liquid ammonia at the nozzle of the ammonia spraying grid (61); A flow rate sensor, used for detecting a flue gas flow rate value in the pipeline component (2); A calculation module 1, used for calculating a predicted value of an average particle diameter of the nozzle spray of the ammonia spray grid (61); Calculation module 2 is used to calculate the abnormal evaluation coefficient of the mixture of liquid ammonia spray and flue gas; Alarm, used to give an alarm in abnormal state; A control unit is used for centralized control and data processing, and regularly detects the inside of the pipeline assembly (2) at set time intervals. The density sensor 1, the density sensor 2, the density sensor 3, the pressure sensor 1, the pressure sensor 2, the calculation module 1, and the calculation module 2 are all electrically connected to the control unit; The comparison and judgment module is used to compare the abnormal evaluation coefficient of the mixture of liquid ammonia spray and flue gas with the preset evaluation range to determine whether it is abnormal.

10. The ash removal device for preventing ash accumulation and blockage of the flue gas denitrification inlet according to claim 9, characterized in that: The calculation module 1 performs calculation based on the following formula 1; Where: SMD is the predicted value of the average particle size of the nozzle spray of the ammonia spray grid (61), σ is the surface tension of liquid ammonia, μ1 is the viscosity of liquid ammonia, ρ1 is the density of the flue gas at the inlet of the horizontal pipe (21) detected by the density sensor 1, ρ2 is the density of the flue gas at the outlet of the vertical pipe (23) detected by the density sensor 2, r y is the thickness of the liquid ammonia film at the nozzle outlet, cos is the cosine function, θ is the semi-cone angle of the spray, ρ y is the density value of liquid ammonia detected by density sensor 3, P3 is the pressure value of liquid ammonia at the inlet of the spray pipe (62) detected by pressure sensor 1, and P4 is the pressure value of liquid ammonia at the nozzle of the ammonia spray grid (61) detected by pressure sensor 2; The calculation module 2 is calculated based on the following formula 2: Where: K is the abnormal assessment coefficient of the mixture of liquid ammonia spray and flue gas, v y is the average flue gas flow rate value detected by the flow rate sensor, v1 is the flue gas flow rate value at the inlet of the horizontal pipe 1 (21) detected by the flow rate sensor, v2 is the flue gas flow rate value at the outlet of the vertical pipe 1 (23) detected by the flow rate sensor, is the flue gas dynamic pressure value at the outlet of vertical pipe 1 (23), is the flue gas dynamic pressure value at the inlet of horizontal duct 1 (21), μ y is the dynamic viscosity coefficient of the flue gas, P1 is the static pressure value of the flue gas detected by the pressure sensor at the inlet of the horizontal pipe (21), P2 is the static pressure value of the flue gas detected by the pressure sensor at the outlet of the vertical pipe (23), a p is the width of the static mixer (614), δ p is the thickness of the static mixer (614), b p is the distance between adjacent static mixers (614); The comparison judgment module is used. If K is within the preset evaluation range, the alarm does not sound. When K is less than the preset evaluation range, the control unit increases the input pressure of the spray pipe (62) until it reaches the preset evaluation range. When K exceeds the maximum value of the preset evaluation range, the control unit controls the alarm to sound an abnormal alarm, and promptly closes the main valve for spraying ammonia for maintenance.

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