CN105797583A - Efficient denitration device with low ammonia escape - Google Patents
Efficient denitration device with low ammonia escape Download PDFInfo
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- CN105797583A CN105797583A CN201610161832.0A CN201610161832A CN105797583A CN 105797583 A CN105797583 A CN 105797583A CN 201610161832 A CN201610161832 A CN 201610161832A CN 105797583 A CN105797583 A CN 105797583A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
Abstract
The invention discloses an efficient denitration device with low ammonia escape and belongs to the field of flue gas denitrification. The efficient denitration device comprises an ammonia spraying device, an ammonia and flue gas mixing device and a flow guidance device, wherein the ammonia spraying device is arranged in a flue between a coal economizer and a denitration catalyst, and the ammonia and flue gas mixing device is arranged behind the ammonia spraying device; the flow guidance device comprises an inlet flow guidance device body and an outlet flow guidance device body and further comprises a flow equalizing device, wherein the inlet flow guidance device body is arranged on the corner of a flue inlet on the flue gas upstream portion of the ammonia spraying device, the outlet flow guidance device body is arranged on the corner of a flue outlet on the flue gas downstream portion of the ammonia and flue gas mixing device, and the flow equalizing device is arranged between the inlet flow guidance device body and the ammonia spraying device; the distance between the corner of the flue inlet and the flow equalizing device is larger than or equal to one time of the flue equivalent diameter, the distance between the flow equalizing device and the ammonia spraying device is larger than or equal to 0.5 m, and the distance between the ammonia and flue gas mixing device and the corner of the flue outlet is 3-5 m. The device meets the requirement for low ammonia escape when denitration efficiency reaches 90% or above.
Description
Technical field
The invention belongs to the out of stock field of flue gas, particularly relate to the control to the escaping of ammonia when denitration efficiency more than 90%.
Background technology
Along with environment protection emission is increasingly paid attention to by country, for boiler tail NOXDischarge value require also more and more higher, " coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014 the year two thousand twenty) " explicitly points out in action plan: the newly-built Thermal generation unit NO of eastern region 11 provinces and citiesXConcentration of emission basically reaches gas turbine group emission limit (namely not higher than 50mg/Nm under benchmark oxygen content 6% condition3), middle part 8 province new-built unit, in principle close to or up gas turbine group emission limit, encourages west area new-built unit close to or up gas turbine group emission limit.Under this background, to the requirement of denitration efficiency often more than 90%, in high efficiency, when being easy to cause denitration efficiency up to standard during low emission value, the escaping of ammonia exceeds standard, and design is just had higher requirement.
Summary of the invention
It is an object of the invention to: propose a kind of to meet the device of low the escaping of ammonia requirement during denitration efficiency more than 90%.
The object of the invention is realized by following technical proposals:
nullA kind of device of the low the escaping of ammonia of NO_x Reduction by Effective，Including the ammonia-gas spraying device being arranged in the flue between economizer and denitrating catalyst and ammonia flue gas mixing arrangement after，And guiding device，Guiding device includes the inlet guide being arranged in the flue entrance corner of ammonia-gas spraying device flue gas upstream，And it is arranged in the outlet guiding device of the flue outlet corner in ammonia flue gas mixing arrangement flue gas downstream，Also include the current equalizer being arranged between inlet guide and ammonia-gas spraying device，Current equalizer is arranged straight plate row by two and is formed，Interlock with layer decussation or levels cross between two rows straight plate row，And levels cross staggered time two-layer be close to layout，Two arrange straight plate row forms by some groups of straight plate groups，Often organize straight plate group to be made up of the adjacent two blocks straight plates being arranged symmetrically，Each straight plate elongated layout in flue section，One arranges straight plate row is in a row made up of along the arrangement of flue depth direction some straight plates，With flue gas direction (due under practical situation on flue section，Flue gas direction also differs，And in order to define a reference direction in this patent，With flue gas flow direction on flue length bearing of trend for flue gas direction: the such as flue of standard cuboid，Long for its longest dimension，Its flue gas direction i.e. its length direction) and flue depth direction constitute face be datum level，Two blocks of straight plates of each straight plate group of this row straight plate row this datum level all vertical，And become 45-70 ° of angle of inclination with flue depth direction，Two blocks of straight plates are arranged symmetrically with in "eight" shape structure on flue depth direction，And this "eight" shape structure is gradually wide along flue gas direction opening；Another is arranged straight plate row and is in a row made up of along the arrangement of flue width some straight plates, the face constituted with flue gas direction and flue width is for datum level, two blocks of straight plates of each straight plate group of this row straight plate row this datum level all vertical, 45-70 ° of angle of inclination is become with flue width, two blocks of straight plates are arranged symmetrically with in "eight" shape structure on flue width, and this "eight" shape structure is gradually wide along flue gas direction opening；Flue entrance corner is to the current equalizer distance flue equivalent diameter be more than or equal to 1 times, and the distance between current equalizer and ammonia-gas spraying device is be more than or equal to 0.5m, and ammonia flue gas mixing arrangement is 3～5m to flue outlet corner distance.
In the present invention, traditional technology is to meet denitration efficiency, the escaping of ammonia by the commutator (catalyst inlet fairing) of increase deflector in denitration flue, catalyst top, but, at denitration efficiency more than 90%, export NOXContent requirement is lower than 50mg/Nm3Time, will there is the escaping of ammonia risk of exceeding criterion in the method, escape ammonia can produce NH3HSO4, thus blocking air preheater.At present, it is common to way be to increase one layer of catalyst, increase nozzle quantity to meet ammonia coverage rate on section.But, inventor studies discovery, and the drawback of this method is not account for the importance of flow field uniformity.Traditional flow field control strategy is before spray ammonia and the catalyst surface two place maximum relative deviation of flow velocity is less than positive and negative 15%, and inventor studies discovery, only this parameter is reduced to 10% even lower, assist to increase catalyst amounts simultaneously, nozzle quantity, could fundamentally ensure that, when requiring high denitration efficiency, the escaping of ammonia does not exceed standard.And in nozzle downstream, owing to there is ammonia flue gas mixing arrangement (such as static type hybrid blade), deflector, catalyst top current equalizer, if adding other current equalizer, effect is inconspicuous.Therefore, inventor studies discovery, only adds suitable current equalizer before spray ammonia, improves the flow field uniformity before spray ammonia, and guarantee ammonia and flue gas reach the mixed effect of optimum, thus reaching the maximization of reaction effect.
Therefore, current equalizer is the equipment of most critical in this technology, and the current equalizer of particular design of the present invention disclosure satisfy that this low the escaping of ammonia of high denitration efficiency and the high request of low flow field relative velocity deviation.
In the present invention, ammonia flue gas mixing arrangement to flue outlet corner distance controlling at 3～5m, to ensure that ammonia and flue gas enter back into denitration flue horizontal segment after being sufficiently mixed, the long substantial increase easily causing flue cost of this value, too short meeting is unable to reach the mixed effect of blender requirement；Current equalizer is to the flue entrance corner distance flue equivalent diameter be more than or equal to 1 times, to ensure that current equalizer is away from smoke backflow district after turning.Straight plate range of tilt angles is 45-70 °, and the excessive current-sharing weak effect of angle, angle too small resistance can increase more.
Additionally, in current equalizer downstream owing to percent opening there will be local, very short-range flow field non-uniform phenomenon, but, along with certainly mixing of flue gas, this non-uniform phenomenon quickly can disappear.Therefore, the distance between nozzle and current equalizer is be more than or equal to 0.5m, the position injection full and uniform in flow field to guarantee ammonia.
As selection, often organize and two blocks of straight plates of straight plate group all have hole, different percent openings can be selected according to resistance.
As further selection, flow field is arranged orientation along straight plate and be there is gradient, and Flow Field Distribution be by p side little by q side big time, p is more than q.In turn, flow field is arranged orientation along straight plate and be there is gradient, and Flow Field Distribution is that q is more than p by p side greatly by q side hour.In the program, in flow field along flue depth direction gradient bigger time, improve the uniformity in flow field further by adjusting current equalizer and the distance p of flue wall, q.Flow Field Distribution be by p side little by q side big time, Adjustable Range makes p more than q, otherwise, when by p side greatly by q side little time, adjust distance make q more than p.
As selection, the length of the straight plate plate spacing be more than or equal to 2 times, to ensure current-sharing effect, this plate spacing is two blocks of straight plates distance at the little opening part of "eight" shape structure of straight plate group.
As selection, straight plate thickness ranges for 3-6mm, can according to the mellow lime content adjustment of flue gas, to prevent abrasion.
As selection, ammonia flue gas mixing arrangement is static type hybrid blade.
As selection, each straight plate is elongated layout in flue section all, and straight plate extends against flue both sides inwall in flue section.
Aforementioned main formula case of the present invention and each further selection scheme thereof can independent assortment to form multiple scheme; it is the scheme that the present invention can adopt and claim: such as the present invention; each selection can select combination in any with other; those skilled in the art can understand there is multiple combination according to prior art and known general knowledge after understanding the present invention program; it is the claimed technical scheme of the present invention, does not do exhaustive at this.
Beneficial effects of the present invention: the present invention can make at denitration efficiency more than 90%, when the escaping of ammonia is less than or equal to 3ppm, by adding current equalizer after entrance is turned, before ammonia flue gas mixing arrangement, to ensure before spray ammonia, flow field relative velocity deviation is even lower less than 10%, to ensure being sufficiently mixed of ammonia and flue gas, before catalyst, ammonia nitrogen mol ratio deviation is optimum.Meanwhile, different current equalizers can be designed according to different denitration efficiencies, resistance.
The current equalizer of the present invention under equal porosity, circular hole board-like (Fig. 7) and bar grating (Fig. 8) that resistance ratios cross over flue section is arranged in flue and Open Side Down that folded plate type (Figure 10) reduces about 2/3.Comparing (Fig. 9) with opening upwards folded plate type, owing to straight plate is uniformly distributed at section, current-sharing effect is more excellent.Meanwhile, when high porosity, due to the existence at straight plate angle of inclination, current-sharing effect is better than that circular hole is board-like and bar grating.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of the straight plate group of the current equalizer of the present invention；
Fig. 3 is the current equalizer arrangement schematic diagram of the embodiment of the present invention 1；
Fig. 4 is the side view of Fig. 3；
Fig. 5 is the current equalizer arrangement schematic diagram of the embodiment of the present invention 2；
Fig. 6 is the side view of Fig. 5；
Fig. 7 is the structural representation of the board-like current equalizer of circular hole in prior art；
Fig. 8 is the structural representation of bar grating current equalizer in prior art；
Fig. 9 is the structural representation of prior art split shed upwards folded plate type current equalizer；
Figure 10 is the structural representation of the downward folded plate type current equalizer of prior art split shed；
Wherein 11. entrance guiding plate 12. entrance guiding plate 2. current equalizer 3. ammonia-gas spraying device 4. static type hybrid blade 5. catalyst inlet fairing 6. denitrating catalyst.
Detailed description of the invention
Following non-limiting examples is used for the present invention is described.
Embodiment 1:
With reference to shown in Fig. 1,2,3,4, a kind of device of the low the escaping of ammonia of NO_x Reduction by Effective, including denitrating catalyst 6 and catalyst inlet fairing 5 thereof, it is arranged in the ammonia-gas spraying device 3 in the flue between economizer and denitrating catalyst 6 and ammonia flue gas mixing arrangement after, and guiding device, as selection, ammonia flue gas mixing arrangement is static type hybrid blade 4, and guiding device is deflector.nullAs shown in this embodiment，Deflector includes the entrance guiding plate 11 being arranged in the flue entrance corner of ammonia-gas spraying device 3 flue gas upstream，And it is arranged in the outlet deflector 12 of the flue outlet corner in static type hybrid blade 4 flue gas downstream，Also include the current equalizer 2 being arranged between entrance guiding plate 11 and ammonia-gas spraying device 3，Current equalizer 2 is arranged straight plate row by two and is formed，Two arrange between straight plate row with layer decussation，Two arrange straight plate row forms by some groups of straight plate groups，Often organize straight plate group to be made up of the adjacent two blocks straight plates being arranged symmetrically，Each straight plate elongated layout in flue section，One arranges straight plate row is in a row made up of along flue depth direction (i.e. l direction in Fig. 3) arrangement some straight plates，The face constituted with flue gas direction and flue depth direction is for datum level，Two blocks of straight plates of each straight plate group of this row straight plate row this datum level all vertical，And 70 ° of angle of inclination A are become with flue depth direction，Two blocks of straight plates are arranged symmetrically with in "eight" shape structure on flue depth direction，And this "eight" shape structure is gradually wide along flue gas direction opening；Another is arranged straight plate row and is in a row made up of along flue width (i.e. w direction in Fig. 4) arrangement some straight plates, the face constituted with flue gas direction and flue width is for datum level, two blocks of straight plates of each straight plate group of this row straight plate row this datum level all vertical, 70 ° of angle of inclination A are become with flue width, two blocks of straight plates are arranged symmetrically with in "eight" shape structure on flue width, and this "eight" shape structure is gradually wide along flue gas direction opening；Flue entrance corner is to current equalizer 2 apart from the flue equivalent diameter that b is 1 times, and the distance between current equalizer 2 and ammonia-gas spraying device 3 is 0.5m, and static type hybrid blade 4 is 3.5m to flue outlet corner distance b.As selection, as shown in this embodiment, the length k of straight plate is the plate spacing of 2 times, and this plate spacing is two blocks of straight plates distance r at the little opening part of "eight" shape structure of straight plate group.Straight plate thickness ranges for 3mm.Often organizing and all have hole on two blocks of straight plates of straight plate group, percent opening is 10%.In flow field along straight plate arrange orientation gradient bigger time, the uniformity in flow field is improved further: wherein by adjustment current equalizer and the distance p of flue wall, q, arrange orientation in flow field along straight plate and there is gradient, and Flow Field Distribution be by p side little by q side big time, p is more than q.In turn, arrange orientation in flow field along straight plate and there is gradient, and Flow Field Distribution is that q is more than p by p side greatly by q side hour.(when straight plate row arranges in a row along flue depth direction, flue depth direction is straight plate row's orientation of this row straight plate row in p and q respectively straight plate row's orientation；Same, when straight plate row arranges in a row along flue width, flue width is straight plate row's orientation of this row straight plate row) two ends to the distance between flue inner wall, l is that (when straight plate row's orientation that flue depth direction is this row straight plate row, this length is the flue degree of depth to flue section length in the row's orientation of this straight plate；Same, when straight plate row's orientation that flue width is this row straight plate row, this length is flue width).This embodiment is at denitration efficiency 91%, and during the escaping of ammonia 3ppm, before ammonia-gas spraying device and catalyst surface flow field relative velocity deviation positive and negative 8%, before catalyst, the maximum relative deviation of ammonia nitrogen mol ratio positive and negative 3% and resistance value added that thus current equalizer brings are 80Pa.
Embodiment 2:
With reference to shown in Fig. 1,2,5,6, a kind of device of the low the escaping of ammonia of NO_x Reduction by Effective, including denitrating catalyst 6 and catalyst inlet fairing 5 thereof, it is arranged in the ammonia-gas spraying device 3 in the flue between economizer and denitrating catalyst 6 and ammonia flue gas mixing arrangement after, and guiding device, as selection, ammonia flue gas mixing arrangement is static type hybrid blade 4, and guiding device is deflector.nullAs shown in this embodiment，Deflector includes the entrance guiding plate 11 being arranged in the flue entrance corner of ammonia-gas spraying device 3 flue gas upstream，And it is arranged in the outlet deflector 12 of the flue outlet corner in static type hybrid blade 4 flue gas downstream，Also include the current equalizer 2 being arranged between entrance guiding plate 11 and ammonia-gas spraying device 3，Current equalizer 2 is arranged straight plate row by two and is formed，Two arrange levels cross between straight plate row interlocks，And levels cross staggered time two-layer be close to layout，Two arrange straight plate row forms by some groups of straight plate groups，Often organize straight plate group to be made up of the adjacent two blocks straight plates being arranged symmetrically，Each straight plate elongated layout in flue section，One arranges straight plate row is in a row made up of along flue depth direction (i.e. l direction in Fig. 5) arrangement some straight plates，The face constituted with flue gas direction and flue depth direction is for datum level，Two blocks of straight plates of each straight plate group of this row straight plate row this datum level all vertical，And 70 ° of angle of inclination A are become with flue depth direction，Two blocks of straight plates are arranged symmetrically with in "eight" shape structure on flue depth direction，And this "eight" shape structure is gradually wide along flue gas direction opening；Another is arranged straight plate row and is in a row made up of along flue width (i.e. w direction in Fig. 6) arrangement some straight plates, the face constituted with flue gas direction and flue width is for datum level, two blocks of straight plates of each straight plate group of this row straight plate row this datum level all vertical, 70 ° of angle of inclination A are become with flue width, two blocks of straight plates are arranged symmetrically with in "eight" shape structure on flue width, and this "eight" shape structure is gradually wide along flue gas direction opening；Flue entrance corner is to current equalizer 2 apart from the flue equivalent diameter that b is 1 times, and the distance between current equalizer 2 and ammonia-gas spraying device 3 is 0.5m, and static type hybrid blade 4 is 4m to flue outlet corner distance b.As selection, as shown in this embodiment, the length k of straight plate is the plate spacing of 2 times, and this plate spacing is two blocks of straight plates distance r at the little opening part of "eight" shape structure of straight plate group.Straight plate thickness ranges for 3mm.Often organizing and all have hole on two blocks of straight plates of straight plate group, percent opening is 12%.In flow field along straight plate arrange orientation gradient bigger time, the uniformity in flow field is improved further: wherein by adjustment current equalizer and the distance p of flue wall, q, arrange orientation in flow field along straight plate and there is gradient, and Flow Field Distribution be by p side little by q side big time, p is more than q.In turn, arrange orientation in flow field along straight plate and there is gradient, and Flow Field Distribution is that q is more than p by p side greatly by q side hour.(when straight plate row arranges in a row along flue depth direction, flue depth direction is straight plate row's orientation of this row straight plate row in p and q respectively straight plate row's orientation；Same, when straight plate row arranges in a row along flue width, flue width is straight plate row's orientation of this row straight plate row) two ends to the distance between flue inner wall, l is that (when straight plate row's orientation that flue depth direction is this row straight plate row, this length is the flue degree of depth to flue section length in the row's orientation of this straight plate；Same, when straight plate row's orientation that flue width is this row straight plate row, this length is flue width).This embodiment is at denitration efficiency 91%, during the escaping of ammonia 3ppm, with catalyst surface flow field relative velocity deviation positive and negative 7% before ammonia-gas spraying device.The maximum relative deviation of ammonia nitrogen mol ratio positive and negative 3% before catalyst.The resistance value added 70Pa that thus current equalizer brings.
Comparative example 1:
With reference to shown in Fig. 1,2,5,6, a kind of device of the low the escaping of ammonia of NO_x Reduction by Effective, including denitrating catalyst 6 and catalyst inlet fairing 5 thereof, it is arranged in the ammonia-gas spraying device 3 in the flue between economizer and denitrating catalyst 6 and ammonia flue gas mixing arrangement after, and guiding device, ammonia flue gas mixing arrangement is static type hybrid blade 4, and guiding device is deflector.nullDeflector includes the entrance guiding plate 11 being arranged in the flue entrance corner of ammonia-gas spraying device 3 flue gas upstream，And it is arranged in the outlet deflector 12 of the flue outlet corner in static type hybrid blade 4 flue gas downstream，Also include the current equalizer 2 being arranged between entrance guiding plate 11 and ammonia-gas spraying device 3，Current equalizer 2 is arranged straight plate row by two and is formed，Two arrange levels cross between straight plate row interlocks，And levels cross staggered time two-layer be close to layout，Two arrange straight plate row forms by some groups of straight plate groups，Often organize straight plate group to be made up of the adjacent two blocks straight plates being arranged symmetrically，Each straight plate elongated layout in flue section，One arranges straight plate row is in a row made up of along flue depth direction (i.e. l direction in Fig. 5) arrangement some straight plates，The face constituted with flue gas direction and flue depth direction is for datum level，Two blocks of straight plates of each straight plate group of this row straight plate row this datum level all vertical，And 70 ° of angle of inclination A are become with flue depth direction，Two blocks of straight plates are arranged symmetrically with in "eight" shape structure on flue depth direction，And this "eight" shape structure is gradually wide along flue gas direction opening；Another is arranged straight plate row and is in a row made up of along flue width (i.e. w direction in Fig. 6) arrangement some straight plates, the face constituted with flue gas direction and flue width is for datum level, two blocks of straight plates of each straight plate group of this row straight plate row this datum level all vertical, 80 ° of angle of inclination A are become with flue width, two blocks of straight plates are arranged symmetrically with in "eight" shape structure on flue width, and this "eight" shape structure is gradually wide along flue gas direction opening；Flue entrance corner is to current equalizer 2 apart from the flue equivalent diameter that b is 1 times, and the distance between current equalizer 2 and ammonia-gas spraying device 3 is 0.5m, and static type hybrid blade 4 is 2m to flue outlet corner distance b.The length k of straight plate is the plate spacing of 2 times, and this plate spacing is two blocks of straight plates distance r at the little opening part of "eight" shape structure of straight plate group.Straight plate thickness ranges for 3mm.Often organize and two blocks of straight plates of straight plate group all have hole, percent opening 10%.This embodiment is at denitration efficiency 91%, during the escaping of ammonia 3ppm, with catalyst surface flow field relative velocity deviation positive and negative 15% before ammonia-gas spraying device.The maximum relative deviation of ammonia nitrogen mol ratio positive and negative 5% before catalyst.The resistance value added 30Pa that thus current equalizer brings.
Comparative example 2:
Opening upwards folded plate type: with reference to Fig. 1, shown in 9, a kind of device of the low the escaping of ammonia of NO_x Reduction by Effective, including the ammonia-gas spraying device 3 in the flue being arranged between economizer and denitrating catalyst 6 and ammonia flue gas mixing arrangement after, and guiding device, as selection, ammonia flue gas mixing arrangement is static type hybrid blade 4, and guiding device is deflector.As shown in this embodiment, deflector includes the entrance guiding plate 11 being arranged in the flue entrance corner of ammonia-gas spraying device 3 flue gas upstream, and it is arranged in the outlet deflector 12 of the flue outlet corner in static type hybrid blade 4 flue gas downstream, also include the current equalizer 2 being arranged between entrance guiding plate 11 and ammonia-gas spraying device 3, current equalizer 2 is opening upwards folded plate type current equalizer as shown in Figure 9, after running a period of time, water conservancy diversion load increases deformation, have impact on the uniformity in flow field.And before ammonia-gas spraying device and when catalyst surface flow field relative velocity deviation reaches positive and negative 8%, the unit number of current equalizer is more, and resistance reaches 120Pa.More than embodiment 1.
Comparative example 3:
Open Side Down folded plate type: with reference to Fig. 1, shown in 10, a kind of device of the low the escaping of ammonia of NO_x Reduction by Effective, including the ammonia-gas spraying device 3 in the flue being arranged between economizer and denitrating catalyst 6 and ammonia flue gas mixing arrangement after, and guiding device, as selection, ammonia flue gas mixing arrangement is static type hybrid blade 4, and guiding device is deflector.As shown in this embodiment, deflector includes the entrance guiding plate 11 being arranged in the flue entrance corner of ammonia-gas spraying device 3 flue gas upstream, and it is arranged in the outlet deflector 12 of the flue outlet corner in static type hybrid blade 4 flue gas downstream, also include the current equalizer 2 being arranged between entrance guiding plate 11 and ammonia-gas spraying device 3, current equalizer 2 is that Open Side Down as shown in Figure 10 folded plate type current equalizer.This embodiment is at denitration efficiency 91%, during the escaping of ammonia 3ppm, with catalyst surface flow field relative velocity deviation positive and negative 8% before ammonia-gas spraying device.The maximum relative deviation of ammonia nitrogen mol ratio positive and negative 3% before catalyst.But the resistance value added 240Pa that thus current equalizer brings.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
Claims (7)
- null1. the device of the low the escaping of ammonia of NO_x Reduction by Effective，Including the ammonia-gas spraying device being arranged in the flue between economizer and denitrating catalyst and ammonia flue gas mixing arrangement after，And guiding device，Guiding device includes the inlet guide being arranged in the flue entrance corner of ammonia-gas spraying device flue gas upstream，And it is arranged in the outlet guiding device of the flue outlet corner in ammonia flue gas mixing arrangement flue gas downstream，It is characterized in that: also include the current equalizer being arranged between inlet guide and ammonia-gas spraying device，Current equalizer is arranged straight plate row by two and is formed，Interlock with layer decussation or levels cross between two rows straight plate row，And levels cross staggered time two-layer be close to layout，Two arrange straight plate row forms by some groups of straight plate groups，Often organize straight plate group to be made up of the adjacent two blocks straight plates being arranged symmetrically，Each straight plate elongated layout in flue section，One arranges straight plate row is in a row made up of along the arrangement of flue depth direction some straight plates，The face constituted with flue gas direction and flue depth direction is for datum level，Two blocks of straight plates of each straight plate group of this row straight plate row this datum level all vertical，And become 45-70 ° of angle of inclination with flue depth direction，Two blocks of straight plates are arranged symmetrically with in "eight" shape structure on flue depth direction，And this "eight" shape structure is gradually wide along flue gas direction opening；Another is arranged straight plate row and is in a row made up of along the arrangement of flue width some straight plates, the face constituted with flue gas direction and flue width is for datum level, two blocks of straight plates of each straight plate group of this row straight plate row this datum level all vertical, 45-70 ° of angle of inclination is become with flue width, two blocks of straight plates are arranged symmetrically with in "eight" shape structure on flue width, and this "eight" shape structure is gradually wide along flue gas direction opening；Flue entrance corner is to the current equalizer distance flue equivalent diameter be more than or equal to 1 times, and the distance between current equalizer and ammonia-gas spraying device is be more than or equal to 0.5m, and ammonia flue gas mixing arrangement is 3～5m to flue outlet corner distance.
- 2. the device of the low the escaping of ammonia of NO_x Reduction by Effective as claimed in claim 1, it is characterised in that: often organize and two blocks of straight plates of straight plate group all have hole.
- 3. the device of the low the escaping of ammonia of NO_x Reduction by Effective as claimed in claim 2, it is characterised in that: flow field is arranged orientation along straight plate and be there is gradient, and Flow Field Distribution be by p side little by q side big time, p is more than q.
- 4. the device of the low the escaping of ammonia of NO_x Reduction by Effective as claimed in claim 2, it is characterised in that: flow field is arranged orientation along straight plate and be there is gradient, and Flow Field Distribution is that q is more than p by p side greatly by q side hour.
- 5. the device of the low the escaping of ammonia of NO_x Reduction by Effective as claimed in claim 1, it is characterised in that: the length of the straight plate plate spacing be more than or equal to 2 times, this plate spacing is two blocks of straight plates distance at the little opening part of "eight" shape structure of straight plate group.
- 6. the device of the low the escaping of ammonia of NO_x Reduction by Effective as claimed in claim 1, it is characterised in that: straight plate thickness ranges for 3-6mm.
- 7. the device of the low the escaping of ammonia of NO_x Reduction by Effective as claimed in claim 1, it is characterised in that: ammonia flue gas mixing arrangement is static type hybrid blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610161832.0A CN105797583B (en) | 2016-03-18 | 2016-03-18 | A kind of device of the low the escaping of ammonia of NO_x Reduction by Effective |
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| CN106345293A (en) * | 2016-11-03 | 2017-01-25 | 无锡华光新动力环保科技股份有限公司 | Fume turbulent flow device used in SCR denitrification system |
| CN107583489A (en) * | 2017-10-31 | 2018-01-16 | 东方电气集团东方锅炉股份有限公司 | A kind of NO_x Reduction by Effective sprays ammonia mixing arrangement |
| CN108786460A (en) * | 2018-08-09 | 2018-11-13 | 国电龙源节能技术有限公司 | Coal-burning power plant's denitration ammonia-gas spraying device flow fieldoptimization system |
| CN112569783A (en) * | 2019-09-30 | 2021-03-30 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Mixing device for mixing gases in a channel of rectangular cross section |
| CN114288847A (en) * | 2021-12-24 | 2022-04-08 | 杭州新世纪能源环保工程股份有限公司 | SCR denitration device with uniform flue gas flow field flow velocity and ammonia concentration distribution |
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| CN106345293A (en) * | 2016-11-03 | 2017-01-25 | 无锡华光新动力环保科技股份有限公司 | Fume turbulent flow device used in SCR denitrification system |
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| CN114288847A (en) * | 2021-12-24 | 2022-04-08 | 杭州新世纪能源环保工程股份有限公司 | SCR denitration device with uniform flue gas flow field flow velocity and ammonia concentration distribution |
| CN114288847B (en) * | 2021-12-24 | 2022-09-02 | 杭州新世纪能源环保工程股份有限公司 | SCR denitration device with uniform flue gas flow field flow velocity and ammonia concentration distribution |
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