CN115646187A - Variable entry guiding device and use its denitration reactor - Google Patents
Variable entry guiding device and use its denitration reactor Download PDFInfo
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- CN115646187A CN115646187A CN202211357829.8A CN202211357829A CN115646187A CN 115646187 A CN115646187 A CN 115646187A CN 202211357829 A CN202211357829 A CN 202211357829A CN 115646187 A CN115646187 A CN 115646187A
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Abstract
The variable inlet guide device comprises a first-level guide unit, wherein the first-level guide unit is arranged at the top end of a denitration tower and connected with an air inlet channel, the variable inlet guide device comprises a partition plate, the partition plate is arranged below the inner side of a top plate of the denitration tower and forms a guide cavity with the top plate, mixed gas can enter the guide cavity from the air inlet channel, a plurality of guide cylinders which are rotatably connected are arranged on the partition plate, the upper ends of the guide cylinders extend into the guide cavity, the lower ends of the guide cylinders extend out of the guide cavity and face a catalyst in the denitration tower, the guide cylinders are divided into a first guide cylinder group and a second guide cylinder group by taking the central line of the denitration tower as a boundary, the guide cylinders close to one side of the air inlet channel are the first guide cylinder group, the guide cylinders far away from one side of the air inlet channel are the second guide cylinder group, and the first guide cylinder group and the second guide cylinder group which are rotatably connected can react with high-speed mixed gas and low-speed mixed gas uniformly react with the catalyst.
Description
Technical Field
The invention relates to the technical field of SCR denitration, in particular to a variable inlet guide device and a denitration reactor using the same.
Background
The current primary task of improving air quality against haze pollution is to control PM2.5 emissions, while organics and nitrates are the most major components of PM2.5, and therefore nitrogen oxide emissions must be drastically reduced.
With the coming of more strict atmospheric pollutant emission standards of China, the emission of nitrogen oxide concentration in chemical plants and power plants including cement manufacturers is required to be reduced to 50 milligrams per standard cubic meter, and the denitration efficiency is required to be greatly improved by new standards.
In order to meet increasingly severe emission standards, plants with more nitrogen oxide waste gas generation begin to adopt SCR denitration reactors to perform harmless treatment on nitrogen oxides in the waste gas, so that the nitrogen oxides and charged ammonia gas generate harmless nitrogen and water under the action of catalysts, and the discharged waste gas meets the new national environment-friendly standard.
At present SCR denitration reactor, the mist of ammonia and nitrogen oxide waste gas is discharged into in the denitration tower from one side on its denitration tower top, in order to make mist can with the even abundant contact of catalyst in the denitration tower, refer specifically to patent 214764550U (comparison document 1) that FIG. 1 demonstrates and disclose an SCR deNOx systems's inner structure, be provided with fixed water conservancy diversion grid and guide plate in the pipeline that the top or the top of its inside denitration tower are connected and carry out the water conservancy diversion to mixing flue gas, the inside water conservancy diversion grid and the guide plate structure of general traditional SCR deNOx reactors are roughly the same with the content disclosed in comparison document 1.
And the production speed of nitrogen oxide waste gas is not fixed in the mill, the production speed of nitrogen oxide waste gas can change along with the work efficiency change of mill, consequently also can make the velocity that the mist got into in the denitration tower also change, the production of nitrogen oxide waste gas is more, the velocity of mist can be fast, most mist can be washed to the one side of keeping away from the inlet port, react with the catalyst of denitration tower this side, the production of nitrogen oxide waste gas is few, the velocity of mist can slow down, most mist can be under the effect of gravity, react with the catalyst that is close to inlet port one side in the denitration tower, fixed water conservancy diversion grid and guide plate can only carry out approximate change to the flow direction of mist, can not adjust to the velocity variation of mist, the mist of constantly changing of velocity can finally lead to catalyst wearing and tearing to consume inhomogeneously, make the catalyst block up easily or collapse, influence the normal work of SCR denitration reactor.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a variable inlet guide device and a denitration reactor using the same.
The technical scheme of the invention is as follows:
a variable inlet guide device comprises a primary guide unit, wherein the primary guide unit is arranged at the top end of a denitration tower and connected with an air inlet channel and comprises a partition plate, the partition plate is arranged below the inner side of a top plate of the denitration tower and forms a guide cavity with the top plate, mixed gas can enter the guide cavity from the air inlet channel, a plurality of air guide cylinders which are rotatably connected are arranged on the partition plate, the upper ends of the air guide cylinders extend into the guide cavity, the lower ends of the air guide cylinders extend out of the guide cavity and face a catalyst in the denitration tower, the air guide cylinders are divided into a first air guide cylinder group and a second air guide cylinder group by taking the center line of the denitration tower as a boundary, the air guide cylinder close to one side of the air inlet channel is the first air guide cylinder group, and the air guide cylinder far away from one side of the air inlet channel is the second air guide cylinder group;
furthermore, the height of the cylinder wall of one side of the air duct far away from the air inlet duct is higher than that of the cylinder wall of the opposite side, so that the air duct is more easily driven by mixed gas blown into the flow guide cavity from the air inlet duct.
Furthermore, the upper end of the air guide cylinder of the first air guide cylinder group faces one side of the air inlet channel in an initial state, the lower end of the air guide cylinder is inclined downwards and faces one side far away from the air inlet channel, the upper end of the air guide cylinder can swing towards the direction far away from the air inlet channel under the blowing of high-speed air flow, and low-speed mixed gas entering the air guide cylinder of the first air guide cylinder group is guided and divided, so that the accelerated wear and aging speed of a catalyst at the side caused by the long-term reaction of the low-speed mixed gas and the catalyst at one side close to the air inlet channel is avoided;
furthermore, the air guide cylinders of the second air guide cylinder group are vertically arranged at the upper end and the lower end in an initial state, the upper end of each air guide cylinder can swing towards the direction away from the air inlet channel under the blowing of high-speed air flow, high-speed mixed gas entering the air guide cylinders of the second air guide cylinder group is guided and divided, and the abrasion and aging speed of the catalyst at one side is prevented from being accelerated due to the fact that the high-speed mixed gas reacts with the catalyst at one side away from the air inlet channel for a long time.
According to the variable inlet guide device, one end, far away from the air inlet, of the top plate of the denitration tower is obliquely and downwards arranged, and the isolation plate is arranged in parallel with the top plate of the denitration tower, so that a space with the same height as the top plate of the denitration tower can be formed between the guide cavity and the top plate of the denitration tower, and mixed air entering the isolation cavity can uniformly blow the rotating cylinder which is rotatably connected onto the isolation plate.
According to the variable inlet guide device, the air duct is internally provided with the spiral air guide module, the spiral air guide module comprises the fixed shaft and the spiral blades, the fixed shaft is vertically arranged at the middle position of the air duct, the spiral blades are arranged between the fixed shaft and the inner wall of the air duct around the fixed shaft, the fixed shaft can provide support for the arrangement of the spiral blades, a spiral air duct is formed between the spiral blades and the air duct, and mixed gas can be fully guided after passing through the spiral air duct, so that the mixed gas can be sprayed out only along the direction of the air duct.
According to the variable inlet guide device, the isolation plate is provided with the air duct hole at the position where the air duct penetrates, the side wall of the air duct is rotatably connected to the inner side of the air duct hole through the rotating shaft, the swing angle of the air duct of the first air duct group is an angle a, the angle of the angle a is 10-30 degrees, the swing angle of the air duct of the second air duct group is an angle b, the angle of the angle b is 5-15 degrees, and the inclination of the air duct hole can limit the direction of the air duct penetrating through the air duct hole, so that the accurate flow direction control of mixed gas passing through the air duct is realized.
Furthermore, the thickness of the wall of the air duct close to one side of the air inlet channel is larger than that of the wall of the opposite side, the weight of the wall of the air duct close to one side of the air inlet channel is larger than that of the wall of the opposite side, the overlooking projection shape of the air duct hole is the same as the outer ring shape of the overlooking section of the air duct, under the limit of the air duct hole, the air duct of the first air duct group is kept in a vertical state when the flow rate of the mixed gas is high, and the air duct of the second air duct group is kept in a vertical state when the flow rate of the mixed gas is low.
Preferably, the minimum length of the air guide cylinder is not less than 40cm, so that the mixed gas can be sufficiently guided after entering the air guide cylinder.
According to the variable inlet guide device, the second-stage rectifying unit is arranged below the first-stage guide unit in the denitration tower and comprises the rectifying plate, the rectifying plate is provided with the rectifying holes, and the rectifying holes are arranged in a staggered mode relative to the air guide cylinder of the first-stage guide unit, so that mixed gas guided by the first-stage guide unit can be rectified when passing through the second-stage rectifying unit, and the mixed gas in contact with a catalyst can flow more stably.
Furthermore, a rectification rotating plate is arranged in the rectification hole, the rectification rotating plate is spiral in shape, and the rectification effect of the secondary rectification unit can be improved due to the arrangement of the rectification rotating plate.
Preferably, the rectifying rotary plate in the rectifying hole adopts a design without a main shaft, so that the whole weight of the secondary rectifying unit can be reduced while the rectifying requirement is met.
A denitrification reactor comprising a variable inlet guide as described above.
The invention has the beneficial effects that:
1. according to the variable inlet guide device and the denitration reactor using the same, the air guide cylinder of the primary guide unit can be used for carrying out targeted guide direction change according to the flow velocity of the mixed gas entering a denitration tower, so that the mixed gas is prevented from being flushed and brushed with a catalyst at a certain position when the flow velocity of the mixed gas is too high or too low, the mixed gas with different flow velocities can be effectively and stably guided correctly, the mixed gas and the catalyst can be subjected to full and uniform catalytic reaction in the denitration tower, and the phenomenon that the catalyst is blocked or collapsed due to uneven wear and consumption is avoided;
2. according to the variable inlet guide device and the denitration reactor using the same, the helical blades in the air guide cylinder and the rectifying rotary plates in the rectifying holes can perform helical guide and helical rectification on passing mixed gas in a helical mode, the flowing direction of the mixed gas can be completely twisted, and compared with the traditional rotational flow plates, the variable inlet guide device is more stable and has a better rectifying effect.
Drawings
The aspects and advantages of the present application will become apparent to those skilled in the art from a reading of the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
In the drawings:
fig. 1 is a schematic structural view of an SCR denitration system disclosed in reference 1;
FIG. 2 is a schematic view showing the state of the inside of the denitration tower when the nitrogen oxide exhaust gas is produced in a small amount in the embodiment 1;
FIG. 3 is a schematic view showing the state of the denitration tower in the embodiment 1 when the nitrogen oxide waste gas is produced in a large amount;
fig. 4 is a schematic structural view of the air guide duct of the first air guide duct set in the present embodiment 1 (the dotted line indicates a state where the flow rate of the mixed gas is large);
fig. 5 is a schematic structural view of an air duct of the second air duct set in the embodiment 1 (the dotted line indicates a state where the flow rate of the mixed gas is large);
fig. 6 is a schematic view of the internal structure of the air duct in this embodiment 1;
FIG. 7 is a top view of the air duct of this embodiment 1;
FIG. 8 is a schematic view of the inner structure of the rectifying hole in this embodiment 1;
the components represented by the reference numerals in the figures are:
1. a denitration tower; 2. an air inlet channel; 3. a first stage flow guide unit; 31. a separator plate; 32. a flow guide cavity; 33. a first air guide cylinder group; 34. a second air guide cylinder group; 35. a spiral wind guiding module; 36. a fixed shaft; 37. a helical blade; 38. a duct hole; 4. a secondary rectification unit; 41. a rectifying plate; 42. a flow rectifying hole; 43. a rectifying rotary plate; 5. a catalyst.
Detailed Description
Example 1
Referring to fig. 2 to 8, a variable inlet guide device comprises a first-stage guide unit 3, wherein the first-stage guide unit 3 is arranged at the top end of a denitration tower 1 and connected with an air inlet channel 2, the first-stage guide unit 3 comprises a partition plate 31, the partition plate 31 is arranged below the inner side of a top plate of the denitration tower 1, a guide cavity 32 is formed between the partition plate and the top plate, mixed gas can enter the guide cavity 32 from the air inlet channel 2, a plurality of rotatably connected air guide cylinders are arranged on the partition plate 31, the upper ends of the air guide cylinders extend into the guide cavity 32, the lower ends of the air guide cylinders extend out of the guide cavity 32 and face a catalyst 5 in the denitration tower 1, the air guide cylinders are divided into a first air guide cylinder group 33 and a second air guide cylinder group 34 by taking the center line of the denitration tower 1 as a boundary, the air guide cylinders close to one side of the air inlet channel 2 are the first air guide cylinder group 33, and the air guide cylinders far away from one side of the air inlet channel 2 are the second air guide cylinder group 34.
Further, referring to fig. 4 to 6, the partition plate 31 is provided with an air duct hole 38 at a position through which the air duct passes, the air duct hole 38 can accommodate the air duct to swing back and forth in the air duct hole 38, the side wall of the air duct is rotatably connected to the inner side of the air duct hole 38 through a rotating shaft, the swing angle of the air duct of the first air duct group 33 is an angle a, the angle of the angle a is 10 to 30 degrees, the swing angle of the air duct of the second air duct group 34 is an angle b, the angle of the angle b is 5 to 15 degrees, and the arrangement of the air duct hole 38 can limit the orientation of the air duct passing therethrough, so that accurate flow direction control of the mixed gas passing through the air duct is realized.
Further, referring to fig. 5 and 6, the thickness of the wall of the air duct on the side close to the air inlet 2 is greater than the thickness of the wall on the opposite side, the weight of the wall on the side close to the air inlet 2 is greater than the weight of the wall on the opposite side, the air duct hole 38 through which the air duct of the first air duct group 33 passes faces an inclination angle a close to the air inlet side relative to the direction of the gravity, the air duct hole 38 through which the air duct of the second air duct group 34 passes faces an inclination angle b away from the air inlet side relative to the direction of the gravity, the top view projection shape of the air duct hole 38 is the same as the outer ring shape of the top view cross section of the air duct, under the limit of the air duct hole 38, the air duct of the first air duct group 33 can maintain the state that the lower end of the air duct is inclined downward to the side away from the air inlet 2 when the flow rate of the mixed gas is low, the vertical state when the mixed gas flow rate is high, and the air duct of the second air duct group 35 can maintain the state that the lower end of the air duct is inclined downward to the side close to the air inlet 2 when the high rate is the mixed gas.
Preferably, the height of the wall of the air duct on the side far away from the air inlet duct is higher than the height of the wall of the air duct on the opposite side, so that the air duct is more easily driven by the mixed gas blown into the flow guide cavity 32 from the air inlet duct 2 to swing and deflect.
Referring to fig. 4, the air ducts of the first air duct group 33 are initially arranged such that the upper end faces the side of the air inlet duct 2, the lower end faces the side away from the air inlet duct 2 in a downward inclined manner, the upper end can swing in the direction away from the air inlet duct 2 under the blowing of high-speed air, when the flow rate of the mixed gas entering the denitration tower 1 from the air inlet duct 2 is not high, most of the low-speed mixed gas enters the first air duct group 33 under the action of gravity, and is guided by the first air duct group 33 in the direction away from the air inlet duct 2, so as to avoid that the abrasion consumption of the catalyst 5 on the side is accelerated due to the long-term reaction of the low-speed mixed gas with the catalyst 5 on the side close to the air inlet duct 2 in the denitration tower 1, when nitrogen oxide waste gas output increases, the gas mixture velocity of flow when accelerating, the gas mixture can be blown to keeping away from intake duct 2 one side in the denitration tower 1 from intake duct 2, the upper end of first air duct group 33 guide duct can be blown to the air current in the 32 gas mixture of water conservancy diversion chamber this moment, make the guide duct lower extreme orientation of first air duct group 33 rotate near one side of intake duct 2, the high-speed gas mixture that gets into first air duct group 33 carries out the reposition of redundant personnel that leads to, let partly high-speed gas can blow to catalyst 5 near intake duct 2 one side, avoid high-speed gas mixture to react with catalyst 5 far away from intake duct 2 one side for a long time and lead to this side catalyst 5 wearing and tearing ageing speed to accelerate.
Referring to fig. 5, the air guide duct of the second air guide duct set 34 is set to be vertically arranged at the upper and lower ends in an initial state, the upper end of the air guide duct set can swing away from the air inlet duct 2 under the blowing of high-speed air flow, when the flow rate of the mixed gas entering the denitration tower 1 from the air inlet duct 2 is not high, a small amount of the mixed gas with low flow rate flowing to the position of the second air guide duct set 34 in the air guide chamber 32 can enter the air guide duct of the second air guide duct set 34, and can perform catalytic reaction with the catalyst 5 directly below under the action of the second air guide duct set 34, when the flow rate of the mixed gas increases, the mixed gas flowing to the large flow rate block at the position of the second air guide duct set 34 in the air guide chamber 32 can blow the upper end of the air guide duct of the second air guide duct set 34, so that the upper end of the air guide duct set 34 rotates towards the side away from the air inlet duct 2, thereby driving the lower end of the air guide duct set 34 to rotate towards the side close to the high-speed air inlet duct 2, and avoiding the influence of the catalyst 5 on the side of the high-speed of the mixed gas entering the denitration tower 2, thereby avoiding the catalyst 5.
Referring to fig. 6, a spiral air guiding module 35 is arranged in the air guiding cylinder, the spiral air guiding module 35 includes a fixed shaft 36 and a spiral blade 37, the fixed shaft 36 is vertically arranged in the middle of the air guiding cylinder, the spiral blade 37 is arranged between the fixed shaft 36 and the inner wall of the air guiding cylinder around the fixed shaft 36, the fixed shaft 36 can provide support for the spiral blade 37, the flow rate of the mixed gas which enters the desulfurizing tower at first is fast, the pressure of the spiral blade 37 in the air guiding cylinder is also high, the fixed shaft 36 can increase the structural strength of the spiral blade 37, the spiral blade 37 is prevented from being blown out by the mixed gas, a spiral air duct is formed between the spiral blade 37 and the air guiding cylinder, the mixed gas can be sufficiently guided after passing through the spiral air duct, and can only be sprayed out along the direction of the air guiding cylinder, so that the accurate control of the flow direction of the mixed gas is realized, the flow guiding effect of the spiral air duct is stronger than that of a single spiral air duct, a plate type guiding device which is common in the market, the flow direction of the mixed gas is further controlled, so that the mixed gas can be in contact with the catalyst 5 more uniformly, and the service life of the catalyst 5 is prevented from being affected by uneven wear.
Preferably, the denitration tower is a cuboid, the cross section of the denitration tower is rectangular, the top plate of the denitration tower is a rectangular flat plate, one end, far away from the air inlet channel 2, of the top plate of the denitration tower 1 is arranged obliquely downwards, so that mixed air entering the isolation cavity can be blown off obliquely downwards after entering the flow guide cavity 32, the isolation plate 31 is arranged in parallel to the top plate of the denitration tower 1, a space with equal height can be formed between the flow guide cavity 32 and the top plate of the denitration tower 1, the mixed air entering the isolation cavity can uniformly blow the rotating cylinder rotatably connected to the isolation plate 31, and the flow guide cylinder can more accurately, uniformly and stably guide the mixed air.
Preferably, the minimum length of the air guide cylinder is not less than 40cm, so that the mixed gas can be sufficiently guided after entering the air guide cylinder, the flow direction of the mixed gas is sufficiently twisted, and the air guide cylinder can have a sufficient guide effect.
Referring to fig. 2, 3 and 7, a second-stage rectification unit 4 is arranged below the first-stage flow guide unit 3 in the denitration tower, the second-stage rectification unit 4 includes a rectification plate 41, the rectification plate 41 is horizontally and fixedly arranged below the first-stage flow guide unit 3 in the denitration tower 1, and above the uppermost catalyst 5, a plurality of rectification holes 42 are formed in the rectification plate 41, and the rectification holes 42 are arranged in a staggered manner relative to the air guide cylinder of the first-stage flow guide unit 3, so that the mixed gas guided by the first-stage flow guide unit 3 can be rectified when passing through the second-stage rectification unit 4, the flow of the mixed gas contacting the catalyst 5 is more stable, the mixed gas is ensured to be stably and uniformly contacted with the catalyst 5, and the phenomena of blockage or collapse and the like caused by uneven wear reaction of the catalyst 5 are further prevented.
Furthermore, a rectification rotary plate 43 is arranged in the rectification hole 42, the rectification rotary plate 43 is spiral in shape, the rectification effect of the secondary rectification unit 4 can be improved due to the arrangement of the rectification rotary plate 43, the mixed gas after being rectified by the rectification rotary plate 43 in a spiral manner can flow more uniformly and can fully react with the catalyst 5 arranged below the secondary rectification unit 4, and the treatment efficiency of nitrogen oxides in the mixed gas is improved.
Preferably, the rotation direction of the rectifying plate 43 is opposite to the rotation direction of the spiral blade 37 in the air guide duct, so that the uniformity of the mixed gas in the denitration tower 1 is further improved.
Preferably, since the flow velocity of the mixed gas is reduced after passing through the primary flow guide unit 3, and the impact force is reduced, the design of no main shaft is adopted for the flow adjusting rotary plate 43 in the flow adjusting hole 42, so that the flow adjusting requirement is met, the overall weight of the secondary flow adjusting unit 4 can be reduced, and the manufacturing cost of the secondary flow adjusting unit 4 can be reduced to a certain extent.
A denitrification reactor comprising a variable inlet guide as described above.
Claims (10)
1. The variable inlet guide device is characterized by comprising a primary guide unit (3), wherein the primary guide unit (3) is arranged at the top end of a denitration tower (1) and connected with an air inlet channel (2), the variable inlet guide device comprises a partition plate (31), the partition plate (31) is arranged below the inner side of a top plate of the denitration tower (1) and forms a guide cavity (32) with the top plate, a plurality of rotatably connected air guide cylinders are arranged on the partition plate (31), the upper ends of the air guide cylinders extend into the guide cavity (32), the lower ends of the air guide cylinders extend out of the guide cavity (32) and face a catalyst (5) in the denitration tower (1), the air guide cylinders are divided into a first air guide cylinder group (33) and a second air guide cylinder group (34) by taking the central line of the denitration tower (1) as a boundary, the first air guide cylinder group (33) is close to one side of the air inlet channel (2), and the second air guide cylinder group (34) is far away from one side of the air inlet channel (2);
the height of the cylinder wall of one side of the air guide cylinder, which is far away from the air inlet duct, is higher than that of the cylinder wall of the opposite side;
the air guide cylinders of the first air guide cylinder group (33) are arranged in an initial state that the upper ends face one side of the air inlet channel (2), the lower ends face one side far away from the air inlet channel (2) obliquely downwards, and the upper ends can swing towards the direction far away from the air inlet channel (2) under the blowing of high-speed air flow;
the upper end and the lower end of the air guide cylinder of the second air guide cylinder group (34) are arranged vertically in an initial state, and the upper end of the air guide cylinder can swing towards the direction far away from the air inlet channel (2) under the blowing of high-speed air flow.
2. The variable inlet guide device according to claim 1, wherein the top plate of the denitration tower (1) is arranged obliquely downward away from the end of the air inlet channel (2), and the separation plate (31) is arranged in parallel with the top plate of the denitration tower (1).
3. The variable inlet guide device according to claim 1, wherein a spiral guide module (35) is arranged in the air guide cylinder, the spiral guide module (35) comprises a fixed shaft (36) and spiral blades (37), the fixed shaft (36) is vertically arranged in the middle of the air guide cylinder, and the spiral blades (37) are arranged between the fixed shaft (36) and the inner wall of the air guide cylinder around the fixed shaft (36).
4. The variable inlet guide device according to claim 1, wherein the partition plate (31) is provided with a duct hole (38) at a position through which the duct passes, the side wall of the duct is rotatably connected to the inside of the duct hole (38) by a rotating shaft, the duct oscillating angle of the first duct group (33) is an angle a, the angle a is 10 to 30 degrees, the duct oscillating angle of the second duct group (34) is an angle b, and the angle b is 5 to 15 degrees.
5. The variable inlet guide device according to claim 4, wherein the thickness of the wall of the air duct adjacent to the air inlet (2) is greater than the thickness of the opposite wall, the weight of the air duct adjacent to the air inlet (2) is greater than the weight of the opposite wall, and the shape of the air duct hole (38) in plan projection is the same as the outer ring shape of the air duct in plan cross section.
6. The variable inlet guide device according to claim 1, wherein the minimum length of the air guide duct is not less than 40cm.
7. The variable inlet guide device according to claim 1, wherein a second-stage rectifying unit (4) is arranged below the first-stage guide unit (3) in the denitration tower, the second-stage rectifying unit (4) comprises a rectifying plate (41), a plurality of rectifying holes (42) are formed in the rectifying plate (41), and the rectifying holes (42) are arranged in a staggered manner relative to the air guide cylinder of the first-stage guide unit (3).
8. A variable inlet guide device according to claim 7, characterized in that a straightening spiral (43) is provided in the straightening orifice (42), the shape of the straightening spiral (43) comprising a spiral.
9. A variable inlet guide device according to claim 8, characterised in that the flow straightening vanes (43) in the flow straightening holes (42) are of a shaftless design.
10. A denitrification reactor comprising the variable inlet guide apparatus of any one of claims 1 to 9.
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| CN202211357829.8A CN115646187B (en) | 2022-11-01 | 2022-11-01 | Variable inlet flow guiding device and denitration reactor using same |
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| CN202211357829.8A CN115646187B (en) | 2022-11-01 | 2022-11-01 | Variable inlet flow guiding device and denitration reactor using same |
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| CN115646187B CN115646187B (en) | 2023-07-21 |
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| CN111569647A (en) * | 2020-05-14 | 2020-08-25 | 华电电力科学研究院有限公司 | SCR denitration inlet flow field adjusting device and control method thereof |
| CN213790875U (en) * | 2020-10-31 | 2021-07-27 | 李通 | SCR denitration reactor entry flue gas water conservancy diversion subassembly |
| CN113815834A (en) * | 2021-10-08 | 2021-12-21 | 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） | Marine air conditioner air distributor with helical blades |
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