Dedusting and gas mixing integrated equipment for denitration device

Abstract

The utility model relates to the technical field of denitration devices, in particular to dust removal and gas mixing integrated equipment for a denitration device, which comprises a boiler tail flue and a T-shaped flue. The T-shaped flue comprises a horizontal flue and a vertical flue vertically communicated with the horizontal flue, a smoke inlet of the horizontal flue is communicated with a smoke outlet of a tail flue of the boiler, one or more flue wind speed balance baffles are arranged in the horizontal flue, and a smoke outlet of the vertical flue is communicated with the denitration device; a strip-shaped grid fluid director is arranged at a connecting port of the vertical flue and the horizontal flue, one or more baffling dust removers are arranged in the horizontal flue below the strip-shaped grid fluid director, and the horizontal flue is connected with an ash storage bin below the baffling dust removers; and an ammonia spraying grid and a plurality of wind wheel ammonia mixers are arranged in the vertical flue above the strip-shaped grid fluid director. By using the integrated equipment, the flue gas can be effectively dedusted and uniformly mixed with ammonia before entering the denitration device.

Description

Technical Field

[0001] The utility model relates to the technical field of denitration devices, in particular to a dust removal and gas mixing integrated device for a denitration device. Background Art

[0002] In recent years, the installed capacity of renewable energy power generation has been increasing, resulting in increasingly frequent flexibility adjustments of coal-fired boilers, especially at low loads where the flue gas carrying capacity is poor, which can easily cause dust accumulation in the flue and wear and blockage of catalysts. What's worse, the flue gas fluctuations caused by flexibility adjustment are large, and conventional ammonia mixing equipment cannot meet the flexibility adjustment of the unit load, resulting in excessive ammonia escape from the denitrification device and blockage of the air preheater.

[0003] Therefore, there is an urgent need for a dust removal and gas mixing integrated device for a denitrification device to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to solve the problems that, when the existing coal-fired boiler is adjusted in flexibility, low-speed flue gas easily causes flue blockage and increased power consumption of the unit; high-ash operation of the unit easily wears and blocks the catalyst, bringing risks to the safe operation of the denitrification device; and the flue gas fluctuations caused by the flexibility adjustment are large, and conventional ammonia mixing equipment cannot meet the flexibility adjustment of the unit load, resulting in excessive ammonia escape from the denitrification device. The utility model provides a dust removal and gas mixing integrated device for the denitrification device.

[0005] The technical solution of the utility model is as follows:

[0006] A dust removal and gas mixing integrated device for a denitrification device, comprising a boiler tail flue and a T-shaped flue;

[0007] The T-shaped flue includes a horizontal flue and a vertical flue vertically connected to the horizontal flue. The smoke inlet of the horizontal flue is connected to the smoke outlet of the boiler tail flue. One or more flue wind speed balancing baffles are arranged inside the horizontal flue. The smoke outlet of the vertical flue is connected to the denitrification device. A strip grid deflector is arranged at the connection between the vertical flue and the horizontal flue. One or more baffle dust collectors are arranged inside the horizontal flue below the strip grid deflector. The horizontal flue is connected to an ash storage bin below the baffle dust collector. An ammonia injection grid and a plurality of wind wheel ammonia mixers are arranged inside the vertical flue above the strip grid deflector.

[0008] Preferably, a plurality of the flue wind speed balancing baffles are arranged at preset intervals in the horizontal and vertical directions inside the horizontal flue.

[0009] Preferably, the total height b of the plurality of flue wind speed balancing baffles spaced apart in the vertical direction is equal to the vertical height m of the horizontal flue. .

[0010] Preferably, the flue wind speed balancing baffle includes an upper wind baffle, a sleeve, a core shaft and a lower wind baffle, the upper wind baffle and the lower wind baffle are installed on the sleeve in relative directions, the sleeve is rotatably mounted on the core shaft, and one end of the core shaft is vertically connected to the side of the horizontal flue.

[0011] Preferably, the height of the lower wind shield is greater than that of the upper wind shield; and a plurality of ash discharge holes are provided on the surface of the sleeve.

[0012] Preferably, the deflection dust collector includes a plurality of right-angled deflection dust removal plates, and the plurality of right-angled deflection dust removal plates are arranged in a stepped manner at preset angles inside the horizontal flue.

[0013] Preferably, the preset angle is a=arctan(m / n), wherein m is the vertical height inside the horizontal flue, and n is the horizontal length inside the vertical flue.

[0014] Preferably, the spacing c between two adjacent deflection dust collectors is equal to the horizontal length n of the vertical flue. .

[0015] Preferably, the strip grid guide comprises a plurality of strip plates arranged at a preset interval, wherein the preset interval is 1 / 4 of the height d of the strip plates. The surfaces of the plurality of strip plates are arranged parallel to the flow direction of the flue gas.

[0016] Preferably, the horizontal arrangement interval of the plurality of wind wheel ammonia mixers is equal to the horizontal length n of the vertical flue. ; The vertical distance between the ammonia injection grid and the multiple wind wheel ammonia mixers is 300mm-500mm.

[0017] Preferably, the wind wheel ammonia mixer includes wind wheel blades, a wind sleeve and a wind wheel shaft, a plurality of the wind wheel blades are installed on the wind sleeve at preset intervals, the wind sleeve is rotatably mounted on the wind wheel shaft, and one end of the wind wheel shaft is vertically connected to the side of the vertical flue.

[0018] Preferably, two adjacent wind wheel blades are arranged in a cross-staggered manner; and a plurality of ash outlet holes are opened on the surface of the wind sleeve.

[0019] Preferably, the ammonia injection grid includes an ammonia supply main pipe and an ammonia injection branch pipe. The ammonia supply main pipe is arranged outside the vertical flue. One end of several ammonia injection branch pipes is connected to the ammonia supply main pipe, and the other end extends to the interior of the vertical flue. Several injection holes are opened on the ammonia injection branch pipes.

[0020] Preferably, the boiler tail flue includes a straight flue and an inclined flue connected to the straight flue, and the smoke outlet of the inclined flue is connected to the smoke inlet of the horizontal flue.

[0021] According to the above technical solution, based on the integrated dust removal and gas mixing equipment used in the denitrification device, the boiler flue gas can be diverted into the horizontal flue by setting up the boiler tail flue, and further by setting a flue wind speed balancing baffle in the horizontal flue, when the boiler is under high load, a large amount of flue gas can blow the flue wind speed balancing baffle into a horizontal shape, and when the load is reduced, the flue wind speed balancing baffle will gradually return to a vertical shape as the airflow decreases, forcing the flue gas to flow mainly through the bottom of the horizontal flue smoke inlet, ensuring that the flue gas at the bottom of the horizontal flue smoke inlet is always flowing at a high flow rate, which can fully carry the smoke dust and avoid the smoke dust from accumulating on the bottom surface of the horizontal flue smoke inlet, resulting in flue blockage and increased power consumption of the unit; and further by A strip grid deflector is set at the connection between the vertical flue and the horizontal flue, and a baffle dust collector and an ash storage bin are set below the strip grid deflector. When the flue gas carrying dust reaches the baffle dust collector area, the dust can fall into the ash storage bin under the inertia and the obstruction of the baffle dust collector and the strip grid deflector, and the low-ash flue gas will rise after being evenly distributed through the strip grid deflector, thereby effectively avoiding the high dust content in the flue gas from wearing out the catalyst and clogging the catalyst, which brings risks to the safe operation of the denitrification device; and further, by setting an ammonia injection grid and multiple wind wheel ammonia mixers, the air flow vortex street can be formed based on the turbulence to achieve uniform mixing of ammonia and low-ash flue gas, thereby avoiding ammonia escape exceeding the standard and effectively improving the denitrification efficiency of the subsequent denitrification device for the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the dust removal and gas mixing integrated equipment for the denitrification device;

[0023] Figure 2 This is a schematic diagram of the structure of the flue wind speed balance baffle of the dust removal and gas mixing integrated equipment used in the denitrification device;

[0024] Figure 3 This is a schematic diagram of the structure of the right-angle baffle dust collector plate of the baffle dust collector of the denitration device for dust removal and gas mixing.

[0025] Figure 4 This is a schematic diagram of the structure of the strip plate of the strip grid guide of the dust removal and gas mixing integrated equipment for the denitrification device;

[0026] Figure 5 This is a schematic diagram of the structure of a wind turbine ammonia mixer, which is a dust removal and gas mixing integrated device for a denitrification device;

[0027] Figure 6 This is a schematic diagram of the structure of the ammonia injection grid of the denitrification device, which is a dust removal and gas mixing integrated device;

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of a dust removal and gas mixing integrated device for a denitrification device in a specific embodiment.

[0029] Description of Reference Numerals

[0030] 1. Boiler tail flue; 11. Straight pipe flue; 12. Inclined pipe flue; 2. Flue wind speed balancing baffle; 21. Upper wind deflector; 22. Sleeve; 23. Core shaft; 24. Lower wind deflector; 3. Horizontal flue; 4. Ash discharge port; 5. Ash storage bin; 6. Baffle dust collector; 61. Right-angle baffle dust collector; 7. Strip grid deflector; 71. Strip plate; 8. Vertical flue; 9. Wind wheel ammonia mixer; 91. Wind wheel blades; 92. Wind sleeve; 93. Wind wheel shaft; 10. Ammonia injection grid; 101. Ammonia supply main pipe; 102. Ammonia injection branch pipe. DETAILED DESCRIPTION

[0031] The following describes the specific implementation of the embodiment of the present invention in detail. It should be understood that the specific implementation described herein is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0032] The utility model provides a dust removal and gas mixing integrated device for a denitrification device, such as Figure 1-7 As shown, the denitrification device uses a dust removal and gas mixing integrated device including a boiler tail flue 1 and a T-shaped flue;

[0033] The T-shaped flue includes a horizontal flue 3 and a vertical flue 8 vertically connected to the horizontal flue 3. The smoke inlet of the horizontal flue 3 is connected to the smoke outlet of the boiler tail flue 1. One or more flue wind speed balancing baffles 2 are arranged inside the horizontal flue 3. The smoke outlet of the vertical flue 8 is connected to the denitrification device. A strip grid deflector 7 is arranged at the connection between the vertical flue 8 and the horizontal flue 3. One or more baffle dust collectors 6 are arranged inside the horizontal flue 3 below the strip grid deflector 7. The horizontal flue 3 is connected to an ash storage bin 5 below the baffle dust collector 6. An ammonia injection grid 10 and a plurality of wind wheel ammonia mixers 9 are arranged inside the vertical flue 8 above the strip grid deflector 7.

[0034] According to the above technical solution, based on the integrated dust removal and gas mixing equipment for the denitrification device, by setting the boiler tail flue 1, the boiler flue gas can be diverted into the horizontal flue 3, and further by setting the flue wind speed balancing baffle 2 in the horizontal flue 3, when the boiler is under high load, a large amount of flue gas can blow the flue wind speed balancing baffle 2 into a horizontal shape, and when the load is reduced, the flue wind speed balancing baffle 2 will gradually return to a vertical shape as the airflow decreases, forcing the flue gas to flow mainly through the bottom of the horizontal flue 3 smoke inlet, ensuring that the flue gas at the bottom of the horizontal flue 3 smoke inlet is always flowing at a high flow rate, which can fully carry the smoke dust and avoid the smoke dust from accumulating on the bottom surface of the horizontal flue 3 smoke inlet, resulting in flue blockage and increased power consumption of the unit; and further by setting the flue wind speed balancing baffle 2 in the vertical A strip grid deflector 7 is provided at the connection port of the flue 8 and the horizontal flue 3, and a baffle dust collector 6 and an ash storage bin 5 are provided below the strip grid deflector 7. When the flue gas carrying dust reaches the baffle dust collector 6 area, the dust can fall into the ash storage bin 5 under the inertia and the obstruction of the baffle dust collector 6 and the strip grid deflector 7, and the low-ash flue gas flows upward after being evenly distributed through the strip grid deflector 7, thereby effectively avoiding the high dust content in the flue gas from wearing out the catalyst and clogging the catalyst, which brings risks to the safe operation of the denitrification device; and further, by providing an ammonia injection grid 10 and a plurality of wind wheel ammonia mixers 9, a vortex street of air flow can be formed based on turbulence to achieve uniform mixing of ammonia and low-ash flue gas, thereby avoiding ammonia escape exceeding the standard and effectively improving the denitrification efficiency of the subsequent denitrification device for the flue gas.

[0035] In the dust removal and gas mixing integrated equipment for the denitrification device described in the present invention, preferably, a plurality of the flue wind speed balancing baffles 2 are arranged at preset intervals in the horizontal and vertical directions inside the horizontal flue 3, and the specific arrangement density is determined according to the horizontal length and vertical height of the horizontal flue 3. Preferably, the total height b of the plurality of flue wind speed balancing baffles 2 arranged at intervals in the vertical direction is 1 / 4 of the vertical height m inside the horizontal flue 3. , and in the horizontal direction, they are arranged at preset intervals, and the specific intervals can be 3000mm-7000mm, so as to more effectively avoid the accumulation of smoke and dust on the bottom surface of the horizontal flue 3.

[0036] In a specific embodiment, the flue wind speed balancing baffle 2 includes an upper windshield 21, a sleeve 22, a core shaft 23, and a lower windshield 24. The upper windshield 21 and the lower windshield 24 are mounted on the sleeve 22 at 180 degrees relative to each other. The sleeve 22 is rotatably mounted on the core shaft 23. One end of the core shaft 23 is vertically connected to the side of the horizontal flue 3. Therefore, under the action of flue gas, the upper windshield 21, the sleeve 22, and the lower windshield 24 can rotate around the core shaft 23, thereby achieving flue wind speed balancing. Preferably, the upper windshield 21 and the lower windshield 24 can be a single plate, divided into upper and lower parts by the sleeve 22.

[0037] In a more specific embodiment, the upper windshield 21, the sleeve 22, the core shaft 23 and the lower windshield 24 of the flue wind speed balancing baffle 2 are all made of wear-resistant steel to ensure sufficient structural strength and suitability for flue gas environments.

[0038] In a preferred embodiment, the height of the lower wind shield 24 is greater than that of the upper wind shield 21. Specifically, the height of the lower wind shield 24 is 500mm-800mm, and the height of the upper wind shield 21 is 100mm-500mm. This allows the lower wind shield 24 to balance the gravity of the upper wind shield 21 while better balancing the flue gas flow rate, thereby ensuring that the flue gas flow rate balancing baffle 2 always remains vertical in its initial state and can gradually return to its initial state when the flue gas flow rate weakens. In another preferred embodiment, a plurality of ash discharge holes are provided on the surface of the sleeve 22 to facilitate the discharge of accumulated ash from the sleeve 22.

[0039] In the integrated dust removal and gas mixing equipment for the denitrification device described in the present invention, preferably, the deflection dust collector 6 includes a plurality of right-angled deflection dust removal plates 61, and the plurality of right-angled deflection dust removal plates 61 are arranged in a stepped manner at preset angles inside the horizontal flue 3, so as to better cooperate with the strip grid deflector 7 to achieve dust removal of the flue gas.

[0040] Further preferably, the preset angle is a=arctan(m / n), wherein m is the vertical height inside the horizontal flue, and n is the horizontal length inside the vertical flue, so as to further better remove dust from the flue gas.

[0041] In another preferred embodiment, the spacing c between two adjacent deflection dust collectors 6 is equal to the horizontal length n of the vertical flue. , thereby further improving the dust removal effect on the flue gas. Among them, the number of right-angled baffle plates 61 included in the two adjacent baffle dust collectors 6 can be the same or different, and can be set according to actual needs.

[0042] In a specific embodiment, the short fold of the right-angled baffle 61 is 50mm-100mm long, the long fold is 300mm-800mm long, and the spacing c between two adjacent baffles 6 is 100mm-200mm, thereby better removing dust from the flue gas. More specifically, the right-angled baffle 61 is made of wear-resistant steel to ensure sufficient structural strength and suitability for flue gas environments. An ash storage bin 5 is provided below the long fold. The ash storage bin 5 is funnel-shaped and has an ash discharge port 4 at the bottom to facilitate ash discharge.

[0043] In the dust removal and gas mixing integrated device for the denitration device of the present invention, preferably, the strip grid deflector 7 includes a plurality of strip plates 71 arranged at preset intervals, and the preset intervals are the height d of the strip plates 71. The surfaces of the multiple strip plates 71 are arranged parallel to the flue gas flow direction, thereby cooperating with the baffled dust collector 6 to better remove dust from the flue gas. Furthermore, the flue gas is evenly distributed before entering the subsequent denitrification device, thereby improving the denitrification effect of the denitrification device on the flue gas. In one specific embodiment, the height d of the strip plates 71 is 200-500 mm, and the thickness is 5-7 mm. In another specific embodiment, the strip plates 71 are made of wear-resistant steel to ensure sufficient structural strength and suitability for flue gas environments.

[0044] In the dust removal and gas mixing integrated equipment for the denitrification device of the present invention, preferably, the horizontal arrangement interval of the plurality of wind wheel ammonia mixers 9 is 1 / 4 of the horizontal length n inside the vertical flue 8. , thereby further effectively improving the uniformity of the mixing of ammonia and low-ash flue gas and preventing excessive ammonia escape. In another preferred embodiment, the ammonia injection grid 10 is arranged above or below the plurality of wind wheel ammonia mixers 9, and the vertical distance between the two is 300mm-500mm, to further improve the uniformity of the mixing of ammonia and low-ash flue gas.

[0045] In a specific embodiment, the wind wheel ammonia mixer 9 includes a wind wheel blade 91, a wind sleeve 92 and a wind wheel shaft 93. A plurality of the wind wheel blades 91 are installed on the wind sleeve 92 at preset intervals. The wind sleeve 92 is rotatably mounted on the wind wheel shaft 93. One end of the wind wheel shaft 93 is vertically connected to the side of the vertical flue 8. In actual application, the low-ash flue gas after dust removal and uniform flow by the deflector dust collector 6 and the strip grid deflector 7 rises along the vertical flue 8, and drives the wind wheel blades 91 and wind sleeves 92 of the plurality of wind wheel ammonia mixers 9 to rotate at high speed around the wind wheel shaft 93, so that the wind wheel blades 91 strongly disturb the airflow, forming an airflow vortex street, strengthening the mixing with the ammonia from the ammonia injection grid 10, and thereby effectively improving the uniformity of the mixing of ammonia and low-ash flue gas. In a more specific embodiment, as Figure 5As shown, the two adjacent wind wheel blades 91 are arranged in a staggered manner, preferably in a cross-staggered manner, so that the flue gas can better drive the wind wheel blades 91 to rotate, thereby improving the uniformity of the mixing of ammonia and low-ash flue gas. In another specific embodiment, a plurality of ash outlet holes are provided on the surface of the wind sleeve 92, so as to facilitate the discharge of accumulated ash from the wind sleeve 92. The height of the wind wheel blades 91 is 200mm-450mm, and the length is 500mm-800mm. The wind wheel blades 91, wind sleeve 92 and wind wheel shaft 93 of the wind wheel ammonia mixer 9 are all made of wear-resistant steel to ensure sufficient structural strength and suitability for flue gas environments.

[0046] In the integrated dust removal and gas mixing equipment for the denitrification device described in the present invention, preferably, the ammonia injection grid 10 includes an ammonia supply main pipe 101 and an ammonia injection branch pipe 102. The ammonia supply main pipe 101 is arranged outside the vertical flue 8, and one end of a plurality of ammonia injection branch pipes 102 is connected to the ammonia supply main pipe 101, and the other end extends to the interior of the vertical flue 8. A plurality of injection holes are provided on the ammonia injection branch pipe 102, so that in actual application, ammonia can be evenly introduced into the vertical flue 8 and evenly mixed with the low-ash flue gas. In another preferred embodiment, the diameter of the ammonia supply main pipe 101 is 30-50 times the diameter of the ammonia injection branch pipe 102, the spacing between two adjacent ammonia injection branch pipes 102 is generally 800mm-1500mm, the spacing between two adjacent injection holes on the ammonia injection branch pipe 102 is 200mm-500mm, and the injection gas velocity is 15m / s-25m / s, so as to better mix with the flue gas.

[0047] In the integrated dust removal and gas mixing equipment for the denitrification device described in the present invention, preferably, the boiler tail flue 1 includes a straight pipe flue 11 and an inclined pipe flue 12 connected to the straight pipe flue 11, and the smoke outlet of the inclined pipe flue 12 is connected to the smoke inlet of the horizontal flue 3, so that while introducing the boiler flue gas, the smoke outlet can be made smaller based on the inclined pipe flue 12, and then better used in conjunction with the flue wind speed balance baffle 2 in the horizontal flue 3 to avoid dust accumulation on the inner bottom of the horizontal flue 3.

[0048] The present invention will be described in detail below through embodiments, but the protection scope of the present invention is not limited thereto.

[0049] Example 1

[0050] Use Figure 1-7 The denitration device shown is implemented with a dust removal and gas mixing integrated device. Specifically, the denitration device includes a boiler tail flue 1 and a T-shaped flue;

[0051] The T-shaped flue includes a horizontal flue 3 and a vertical flue 8 vertically connected to the horizontal flue 3, the smoke inlet of the horizontal flue 3 is connected to the smoke outlet of the boiler tail flue 1, the horizontal flue 3 is provided with one or more flue wind speed balancing baffles 2, the smoke outlet of the vertical flue 8 is connected to the denitrification device, the vertical flue 8 and the horizontal flue 3 are connected with a strip grid deflector 7, the horizontal flue 3 is provided with one or more baffle dust collectors 6 below the strip grid deflector 7, the horizontal flue 3 is connected with an ash storage bin 5 below the baffle dust collector 6, the vertical flue 8 is provided with an ammonia injection grid 10 and a plurality of wind wheel ammonia mixers 9 above the strip grid deflector 7; the boiler tail flue 1 includes a straight pipe flue 11 and an inclined pipe flue 12 connected to the straight pipe flue 11, the smoke outlet of the inclined pipe flue 12 is connected to the smoke inlet of the horizontal flue 3.

[0052] In actual application, the flue gas to be denitrified from the boiler enters through the boiler tail flue 1, and then the flue gas entering the boiler tail flue 1 maintains a high flow rate under the acceleration of the inclined tube flue 12, the horizontal flue 3 and the flue wind speed balance baffle 2. Then, under the inertia and the obstruction of the deflection dust collector 6 and the strip grid deflector 7, the smoke falls into the ash storage bin 5. The low-ash flue gas flows evenly through the strip grid deflector 7 and then ascends to the ammonia injection grid 10 and multiple wind wheel ammonia mixers 9 for uniform mixing of ammonia and low-ash flue gas.

[0053] After testing, it was found that the use of the integrated dust removal and gas mixing equipment for the denitrification device described in the utility model can effectively avoid the accumulation of dust on the bottom of the horizontal flue, which leads to flue blockage and increased power consumption of the unit, compared with the existing solution of directly mixing boiler flue gas and ammonia without dust removal and then sending them to the denitrification device for denitrification, and avoid the high dust content in the flue gas that wears and clogs the catalyst, which brings risks to the safe operation of the denitrification device, and realize the effective and uniform mixing of ammonia and low-ash flue gas, thereby improving the subsequent denitrification efficiency of the flue gas.

[0054] Example 2

[0055] The embodiment 1 is implemented with reference to the embodiment 1, except that the six flue wind speed balancing baffles 2 are arranged at preset intervals in the horizontal and vertical directions inside the horizontal flue 3; the total height b of the two flue wind speed balancing baffles 2 arranged at intervals in the vertical direction is equal to the vertical height m of the horizontal flue 3. ; The flue wind speed balancing baffle 2 includes an upper wind shield 21, a sleeve 22, a core shaft 23 and a lower wind shield 24. The upper wind shield 21 and the lower wind shield 24 are installed on the sleeve 22 at 180° relative to each other. The sleeve 22 is rotatably mounted on the core shaft 23. One end of the core shaft 23 is vertically connected to the side of the horizontal flue 3; the height of the lower wind shield 24 is greater than the height of the upper wind shield 21; a plurality of ash discharge holes are provided on the surface of the sleeve 22.

[0056] After testing, it was found that the use of the integrated dust removal and gas mixing equipment for the denitrification device described in the utility model can further effectively prevent smoke and dust from accumulating on the bottom surface of the horizontal flue, causing flue blockage and increased power consumption of the unit, compared with the solution in Example 1, while improving the dust removal effect on the flue gas.

[0057] Example 3

[0058] Refer to Example 2 for implementation. The difference is that the deflection dust collector 6 includes a plurality of right-angle deflection dust collecting plates 61, which are arranged in a stepped manner at a preset angle inside the horizontal flue 3; the preset angle is a=arctan(m / n), where m is the vertical height inside the horizontal flue, and n is the horizontal length inside the vertical flue; the setting interval c between two adjacent deflection dust collectors 6 is the horizontal length n inside the vertical flue. The strip grid deflector 7 includes a plurality of strip plates 71 arranged at a preset interval, the preset interval being the height d of the strip plates 71. The plate surfaces of the plurality of strip plates 71 are arranged parallel to the flow direction of the flue gas.

[0059] After testing, it was found that the use of the integrated dust removal and gas mixing equipment for the denitrification device described in the utility model, compared with the solution in Example 2, based on the synergistic effect of the ash storage bin 5, the baffle dust collector 6 and the strip grid guide 7, can further effectively avoid the high dust content in the flue gas from wearing out the catalyst and clogging the catalyst, which brings risks to the safe operation of the denitrification device. At the same time, based on the uniform flow of the flue gas, the denitrification effect of the subsequent flue gas can also be improved.

[0060] Example 4

[0061] Refer to Example 3, except that the horizontal arrangement interval of the plurality of wind wheel ammonia mixers 9 is 1 / 4 of the horizontal length n of the vertical flue 8. ; The vertical distance between the ammonia injection grid 10 and the multiple wind wheel ammonia mixers 9 is 400 mm; the wind wheel ammonia mixer 9 includes a wind wheel blade 91, a wind sleeve 92 and a wind wheel shaft 93, and several of the wind wheel blades 91 are installed on the wind sleeve 92 at preset intervals. The wind sleeve 92 is rotatably mounted on the wind wheel shaft 93, and one end of the wind wheel shaft 93 is vertically connected to the side of the vertical flue 8; the adjacent two wind wheel blades 91 are arranged in a cross-staggered manner.

[0062] After testing, it was found that the use of the integrated dust removal and gas mixing equipment for the denitrification device described in the utility model can further effectively improve the uniformity of the mixing of low-ash flue gas and ammonia compared to the solution in Example 3, thereby avoiding excessive ammonia escape and improving the denitrification efficiency of subsequent flue gas.

[0063] Example 5

[0064] Refer to Example 4 for implementation, except that the ammonia injection grid 10 includes an ammonia supply main pipe 101 and an ammonia injection branch pipe 102. The ammonia supply main pipe 101 is arranged outside the vertical flue 8, and one end of a plurality of ammonia injection branch pipes 102 is connected to the ammonia supply main pipe 101, and the other end extends to the interior of the vertical flue 8. A plurality of injection holes are provided on the ammonia injection branch pipes 102.

[0065] After testing, it was found that the use of the integrated dust removal and gas mixing equipment for the denitrification device described in the utility model can further effectively improve the uniformity of the mixing of low-ash flue gas and ammonia compared to the solution in Example 4, thereby avoiding excessive ammonia escape and improving the denitrification efficiency of subsequent flue gas.

[0066] The utility model provides a denitrification device with a dust removal and gas mixing integrated equipment. By arranging a boiler tail flue, the boiler flue gas can be diverted into the horizontal flue, and further by arranging a flue wind speed balancing baffle in the horizontal flue, when the boiler is under high load, a large amount of flue gas can blow the flue wind speed balancing baffle into a horizontal shape. When the load is reduced, the flue wind speed balancing baffle will gradually return to a vertical shape as the air flow decreases, forcing the flue gas to flow mainly through the bottom of the horizontal flue smoke inlet, ensuring that the flue gas at the bottom of the horizontal flue smoke inlet is always flowing at a high flow rate, which can fully carry the smoke dust and avoid the smoke dust from accumulating on the bottom surface of the horizontal flue smoke inlet, resulting in smoke duct blockage and increased power consumption of the unit operation; and further by arranging a strip grid deflector at the connecting port of the vertical flue and the horizontal flue, and at the bottom of the strip grid deflector A baffle dust collector and an ash storage bin are set up. When the flue gas carrying dust reaches the baffle dust collector area, the dust can fall into the ash storage bin due to inertia and the obstruction of the baffle dust collector and the strip grid guide. The low-ash flue gas flows upward after uniform flow through the strip grid guide, thereby effectively avoiding the high dust content in the flue gas from wearing out the catalyst and clogging the catalyst, which brings risks to the safe operation of the denitrification device; and further by setting an ammonia spray grid and a plurality of wind wheel ammonia mixers, ammonia and low-ash flue gas can be evenly mixed based on turbulence, thereby avoiding ammonia escape exceeding the standard and effectively improving the denitrification efficiency of the subsequent denitrification device for the flue gas; and further by setting an ammonia spray grid and a plurality of wind wheel ammonia mixers, ammonia and low-ash flue gas can be evenly mixed based on turbulence, thereby avoiding ammonia escape exceeding the standard and effectively improving the denitrification efficiency of the subsequent denitrification device for the flue gas.

[0067] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the technical scope of the present invention, various simple variations of the present invention's technical solution are possible. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple variations and combinations should also be considered as disclosed herein and fall within the scope of protection of the present invention.

Claims

1. A dust removal and gas mixing integrated device for a denitrification device, characterized in that: The denitrification device includes a dust removal and gas mixing integrated device comprising a boiler tail flue (1) and a T-shaped flue; The T-shaped flue comprises a horizontal flue (3) and a vertical flue (8) vertically connected to the horizontal flue (3); the smoke inlet of the horizontal flue (3) is connected to the smoke outlet of the boiler tail flue (1); one or more flue wind speed balancing baffles (2) are arranged inside the horizontal flue (3); the smoke outlet of the vertical flue (8) is connected to a denitrification device; a strip grid deflector (7) is arranged at the connection between the vertical flue (8) and the horizontal flue (3); one or more baffle dust collectors (6) are arranged inside the horizontal flue (3) below the strip grid deflector (7); the horizontal flue (3) is connected to an ash storage bin (5) below the baffle dust collector (6); and an ammonia injection grid (10) and a plurality of wind wheel ammonia mixers (9) are arranged inside the vertical flue (8) above the strip grid deflector (7).

2. The integrated dust removal and gas mixing equipment for a denitrification device according to claim 1, characterized in that: A plurality of flue wind speed balancing baffles (2) are arranged at preset intervals in the horizontal and vertical directions inside the horizontal flue (3).

3. The integrated dust removal and gas mixing equipment for a denitrification device according to claim 2, characterized in that: The total height b of the plurality of flue wind speed balancing baffles (2) arranged at intervals in the vertical direction is equal to the vertical height m inside the horizontal flue (3). .

4. The integrated dust removal and gas mixing equipment for a denitration device according to any one of claims 1 to 3, characterized in that: The flue wind speed balancing baffle (2) comprises an upper wind shield (21), a sleeve (22), a core shaft (23) and a lower wind shield (24). The upper wind shield (21) and the lower wind shield (24) are mounted on the sleeve (22) in opposite directions. The sleeve (22) is rotatably mounted on the core shaft (23). One end of the core shaft (23) is vertically connected to the side of the horizontal flue (3).

5. The integrated dust removal and gas mixing equipment for a denitration device according to claim 4, characterized in that: The height of the lower wind shield (24) is greater than that of the upper wind shield (21); and a plurality of ash discharge holes are provided on the surface of the sleeve (22).

6. The integrated dust removal and gas mixing equipment for a denitrification device according to claim 1, characterized in that: The deflection dust collector (6) comprises a plurality of right-angled deflection dust removal plates (61), and the plurality of right-angled deflection dust removal plates (61) are arranged in a stepped manner at preset angles inside the horizontal flue (3).

7. The integrated dust removal and gas mixing equipment for a denitration device according to claim 6, characterized in that: The preset angle is a=arctan(m / n), wherein m is the vertical height inside the horizontal flue, and n is the horizontal length inside the vertical flue.

8. The integrated dust removal and gas mixing equipment for a denitrification device according to claim 1 or 6, characterized in that: The spacing c between two adjacent deflection dust collectors (6) is equal to the horizontal length n inside the vertical flue. .

9. The integrated dust removal and gas mixing equipment for a denitrification device according to claim 1, characterized in that: The strip grid deflector (7) comprises a plurality of strip plates (71) arranged at preset intervals, wherein the preset intervals are equal to the height d of the strip plates (71). The plate surfaces of the plurality of strip plates (71) are arranged parallel to the flow direction of the flue gas.

10. The integrated dust removal and gas mixing equipment for a denitrification device according to claim 1, characterized in that: The horizontal arrangement interval of the plurality of wind wheel ammonia mixers (9) is equal to the horizontal length n of the vertical flue (8). The vertical distance between the ammonia injection grid (10) and the plurality of wind wheel ammonia mixers (9) is 300 mm to 500 mm.

11. The integrated dust removal and gas mixing equipment for a denitration device according to claim 1 or 10, characterized in that: The wind wheel ammonia mixer (9) comprises a wind wheel blade (91), a wind sleeve (92) and a wind wheel shaft (93), wherein a plurality of the wind wheel blades (91) are mounted on the wind sleeve (92) at preset intervals, and the wind sleeve (92) is rotatably mounted on the wind wheel shaft (93), and one end of the wind wheel shaft (93) is vertically connected to the side of the vertical flue (8).

12. The integrated dust removal and gas mixing equipment for a denitration device according to claim 11, characterized in that: The adjacent two wind wheel blades (91) are arranged in a cross-staggered manner; and a plurality of ash outlet holes are provided on the surface of the wind sleeve (92).

13. The integrated dust removal and gas mixing equipment for a denitrification device according to claim 1, characterized in that: The ammonia injection grid (10) comprises an ammonia supply main pipe (101) and an ammonia injection branch pipe (102). The ammonia supply main pipe (101) is arranged outside the vertical flue (8). One end of a plurality of ammonia injection branch pipes (102) is connected to the ammonia supply main pipe (101), and the other end extends to the interior of the vertical flue (8). The ammonia injection branch pipes (102) are provided with a plurality of injection holes.

14. The integrated dust removal and gas mixing equipment for a denitrification device according to claim 1, characterized in that: The boiler tail flue (1) comprises a straight flue (11) and an inclined flue (12) connected to the straight flue (11), and a smoke outlet of the inclined flue (12) is communicated with a smoke inlet of the horizontal flue (3).

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