CN105289300A - Rotational flow plate type SCR denitration tower and denitration method thereof - Google Patents
Rotational flow plate type SCR denitration tower and denitration method thereof Download PDFInfo
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- CN105289300A CN105289300A CN201510765741.3A CN201510765741A CN105289300A CN 105289300 A CN105289300 A CN 105289300A CN 201510765741 A CN201510765741 A CN 201510765741A CN 105289300 A CN105289300 A CN 105289300A
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Abstract
The invention discloses a rotational flow plate type SCR denitration tower and a denitration method thereof. The denitration tower comprises a denitration tower body and a corrugated plate type catalyst layer arranged along the inner circumference face of the denitration tower body, and the corrugated plate type catalyst layer forms a flue gas channel. A plurality of layers of rotational flow atomizing nozzles performing jetting in the contact circle direction are distributed on the circumference face of the corrugated plate type catalyst layer from bottom to top. When flue gas enters the flue gas channel from the bottom of the denitration tower body, and the flue gas encounters ammonia gas jetted by the whirlwind atomizing nozzles, the flue gas and the ammonia gas are mixed in an entrainment mode and spirally raises in the inner circumference direction of the flue gas channel in a contact circle mode because the ammonia gas is jetted in a rotational flow mode in the contact circle direction. On the premise that efficient denitration is guaranteed, the catalyst use amount of the denitration tower is small, the technical means is easy and convenient to use. Compared with the prior art, the denitration tower is simple in structure, low in manufacturing cost, high in denitration efficiency and low in energy consumption, reduces the ammonia escape rate, makes denitration cost greatly reduced, and remarkably improves economic benefits.
Description
Technical field
The present invention relates to denitrating flue gas, particularly relate to a kind of spiral-flow plate-type SCR denitration tower and method of denitration thereof.
Background technology
Along with the aggravation of greenhouse effects and haze weather, the great fume treatment pressure of the industry faces such as electric power, petrochemical industry and pollutant control pressure, progressively increase major pollutants NO in flue gas
xemission control.In order to protection of the environment, need NO
xadminister, fundamentally administer NO
xdischarge the pollution caused imperative.
The method of denitration be widely adopted at present is Selective catalytic reduction method (SCR).The method utilizes NH
3as reducing agent under the effect of catalyst by NO
xbe reduced to harmless N
2, thus remove the NO in flue gas
x.Select suitable catalyst to be the core of SCR technology, catalyst structure generally has honeycomb fashion, flat and corrugated plate dst three kinds.Wherein, flat or corrugated plate dst catalyst has better anti-laying dust and blocking ability than cellular catalyst, but gas-solid contact specific area is little, catalytic reaction ability.
Research shows, denitration device both domestic and external, and due to by the impact of gas-solid contact area, in tower body, the Flow Field Distribution of flue gas is uneven, and the limited time of flue gas and reducing agent, catalyst exposure, its catalytic reduction reaction efficiency is low, and extensively there is NH
3the problem such as escape, catalyst blockage, catalyst failure.Not only affect the raising of denitration efficiency, and cause denitration cost up, occur secondary pollution problems.Research and develop efficient SCR device very urgent with necessity.
By known to existing SCR system research, the factor affecting denitration efficiency comprises reaction temperature, the time of staying, the mixture homogeneity of reducing agent and flue gas, reducing agent and NO
xstoichiometric ratio, catalyst performance etc.According to the kinetics principle of SCR catalyst, when reaction temperature and catalyst performance certain, ammonia and NO
xthe denitration efficiency of mixability on SCR technique there is great impact.In traditional denitration device, in order to increase ammonia and NO
xincorporation time, have employed the cross-sectional area of aggrandizement apparatus, reduce flue gas flow rate, increase the method for tower body height or length.The cross-sectional area of aggrandizement apparatus not only causes flow field in tower to present laminar flow regime, decreases the turbulence level of blender, reduces denitration efficiency, and add the deposition of particle in flue gas, make a large amount of dust stratification of catalyst surface, affect the activity of catalyst, increase the escape of ammonia; Increase tower body height or length increase catalyst amount again greatly, increase construction cost and operating cost.
Summary of the invention
The object of the invention is to the shortcoming and defect overcoming above-mentioned prior art, a kind of spiral-flow plate-type SCR denitration tower and method of denitration thereof are provided.Both can realize flue gas NO_x Reduction by Effective, solve again the problem of easy dust stratification, catalyst failure and the escaping of ammonia often occurred in prior art.
The present invention is achieved through the following technical solutions:
A kind of spiral-flow plate-type SCR denitration tower, the corrugated plate dst catalyst layer 9 comprising denitrating tower body and arrange along the inner peripheral surface of denitrating tower body; Corrugated plate dst catalyst layer 9 forms exhaust gases passes;
Along the periphery of corrugated plate dst catalyst layer 9, be distributed with multiple vortex atomizing nozzles 8 that multilayer is sprayed along circle of contact direction from bottom to top; When flue gas to be entered in exhaust gases passes by the bottom of denitrating tower body and meets with the ammonia that vortex atomizing nozzle 8 sprays, because ammonia sprays along circle of contact direction eddy flow, flue gas and ammonia are entrainmented mutually mix, and along the inner periphery direction by exhaust gases passes with the mode spiral of the circle of contact; Each vortex atomizing nozzle 8 connects the ammonia feed system be arranged on outside desulfurizing tower by pipeline.
The smoke inlet place of described denitrating tower body lower part is provided with cyclone 10, and the blade rotation of cyclone 10 makes flue gas spiral.
The described periphery along corrugated plate dst catalyst layer 9, is intervally distributed with multiple soot blower 7 from bottom to top, and soot blower 7 is attached to the dust stratification on corrugated plate dst catalyst layer 9 surface for blowing off.
Described ammonia feed system comprise liquid ammonia storage tank 6 that pipeline successively connects, for liquefied ammonia is evaporated liquid ammonia evaporator 5, for ammonia is cushioned ammonia dashpot 4, for ammonia/air mixer 3 of mixing ammonia and air and the dilution air 2 for diluting ammonia;
Described ammonia/air mixer 3 connects vortex atomizing nozzle 8 by one with the pipeline of magnetic valve 13; The outside of described denitrating tower body is also provided with a escaping of ammonia feedback control system 1, and the exhanst gas outlet of described denitrating tower bodies top is provided with the probe 12 for detecting ammonia density; The concentration data of the ammonia that the escaping of ammonia feedback control system 1 detects according to probe 12, controlling the aperture of ammonia feed system and magnetic valve 13, for controlling the straying quatity of vortex atomizing nozzle 8 pairs of ammonia in real time, making to spray into the ammonia amount in exhaust gases passes and NO
xconcentration matches.
Described denitrating tower body bottom portion is provided with dust stratification case 11, and the middle part of dust stratification case 11 has the tubaeform through hole passed through for flue gas.
A kind of spiral-flow plate-type SCR denitration method is as follows:
The cyclone 10 that flue gas is arranged by the smoke inlet place of denitrating tower body lower part, under the blade rotation effect of cyclone 10, flow-disturbing is carried out to flue gas, make flue gas spiral and enter to form in exhaust gases passes by corrugated plate dst catalyst layer 9, when the ammonia that spiralling flue gas and vortex atomizing nozzle 8 spray meets, because ammonia is sprayed along circle of contact direction by vortex atomizing nozzle 8 eddy flow, spiralling flue gas and ammonia are entrainmented mutually mix, and along the inner periphery direction by exhaust gases passes with the mode spiral of the circle of contact, repeatedly corrugated plate dst catalyst layer 9 is tangentially washed away in uphill process, and there is catalytic reduction reaction, increase the specific area contacted with corrugated plate dst catalyst layer 9, achieve denitrating flue gas.Can catalyst amount be reduced, strengthen catalytic reaction, reduce the escape of ammonia, improve denitrating flue gas efficiency.
The escaping of ammonia FEEDBACK CONTROL step: when probe 12 detects that the concentration of ammonia in flue gas is greater than preset value, the ammonia density data that the escaping of ammonia feedback control system 1 is fed back according to this probe 12, control the aperture of ammonia feed system and magnetic valve 13, for controlling the straying quatity of vortex atomizing nozzle 8 pairs of ammonia in real time, make to spray into the ammonia amount in exhaust gases passes and NO
xconcentration and preset value match.
The present invention, relative to prior art, has following advantage and effect:
1, flue gas and NH
3good mixing effect, even flow field, denitration efficiency are high.Flue gas is by cyclone, and eddy flow rises, and entrainments the ammonia sprayed into; Ammonia adopts and sprays into along exhaust gases passes circumferencial direction circle type eddy flow, enhances eddy flow field.The two entrainments mutually, makes flue gas and reducing agent Homogeneous phase mixing, forms a kind of swirling flow atomizing state.This swirling flow atomizing state, compared with the fluidised form that it is traditional, can increase the speed of gaseous mixture at circumferencial direction on the one hand, ensures that flue gas has enough strokes in exhaust gases passes, makes the abundant denitration of flue gas.On the other hand, flue gas spiral and non-rectilinear rise, add the stroke of flue gas in exhaust gases passes and the time of staying, make flow field more even, degree of filling is good, makes the catalytic reduction reaction of flue gas more abundant, time of contact is longer, increase reactant contact gear ratio surface area, the present invention efficiently utilizes the space of denitrating tower, further increases denitration efficiency.
2, avoid catalyst dust stratification, improve catalyst service efficiency.Corrugated plate dst catalyst layer is arranged in eddy flow catalysis field, gaseous mixture (flue gas and ammonia) is under the effect of corrugated plate dst catalyst layer surface high-speed rotational, the dust that centrifugation goes out, along the wall of the exhaust gases passes be made up of corrugated plate dst catalyst layer, tumbles the dust stratification case being arranged in bottom.In addition, for improving dust removing effects further, and being provided with soot blower between corrugated plate dst catalyst layer, regularly blowing eddy flow centrifugation off and going out and the dust stratification being attached to corrugated plate dst catalyst layer surface.Efficiently solve the contradiction between flue gas flow rate, dust stratification, contact gear ratio surface area, gaseous mixture is under corrugated plate dst catalyst layer surface repeatedly high-speed rotational effect, both decreased dust stratification and blocking, alleviated catalyst failure, and made again catalyst service efficiency reach higher level.
3, the escapement ratio of ammonia is reduced.On the one hand because ammonia sprays in the mode of eddy flow, flue gas and ammonia are entrainmented mutually and mixes, and along the inner periphery direction by exhaust gases passes with the mode spiral of the circle of contact, reduce NH in denitrating tower exiting flue gas
3volume fraction, have effectively achieved the NO_x Reduction by Effective of flue gas, reduce NH
3escapement ratio.On the other hand, for optimizing NH further
3escapement ratio, add the escaping of ammonia feedback control system, and be provided with the probe for detecting ammonia density at the exhanst gas outlet of denitrating tower bodies top; Ammonia feedback control system, according to the concentration data of the ammonia detected of popping one's head in, controlling the aperture of ammonia feed system and magnetic valve, for controlling the straying quatity of vortex atomizing nozzle to ammonia in real time, making to spray into the ammonia amount in exhaust gases passes and NO
xconcentration matches.Solve in traditional SCR device and spray ammonia real-time tracking Dynamic controlling problem, both ensured denitration efficiency, and reduce further the escapement ratio of ammonia.
4, the present invention is under the prerequisite ensureing NO_x Reduction by Effective, and catalyst amount is few, and technological means is simple and easy to do.Compared with prior art not only denitrating tower structure is simple, cheap, and denitration efficiency is high, and energy consumption is low, denitration cost is significantly reduced, significantly improves economic benefit.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is Fig. 1 hydrocyclone structure schematic diagram.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is more specifically described in detail.
Embodiment
As shown in Figure 1, 2.The invention discloses a kind of spiral-flow plate-type SCR denitration tower, the corrugated plate dst catalyst layer 9 comprising denitrating tower body and arrange along the inner peripheral surface of denitrating tower body; Corrugated plate dst catalyst layer 9 forms exhaust gases passes; Along the periphery of corrugated plate dst catalyst layer 9, be distributed with multiple vortex atomizing nozzles 8 that multilayer is sprayed along circle of contact direction from bottom to top; When flue gas to be entered in exhaust gases passes by the bottom of denitrating tower body and meets with the ammonia that vortex atomizing nozzle 8 sprays, because ammonia sprays along circle of contact direction eddy flow, flue gas and ammonia are entrainmented mutually mix, and along the inner periphery direction by exhaust gases passes with the mode spiral of the circle of contact; The ammonia that eddy flow is sprayed moves together with flue gas, enhance flue gas to mix with reducing agent, whole flow field is made fully to reach turbulent, solve the laminar flow regime that traditional SCR denitration flow field in tower presents, flue gas mixes bad with ammonia, the problem of flow field inequality, increases the specific area of gaseous mixture and catalyst exposure, further increases (nitrogen oxide) NO in ammonia and flue gas
xtime of contact with catalyst, improve denitration efficiency, decrease the escape of ammonia.
The smoke inlet place of described denitrating tower body lower part is provided with cyclone 10, and the blade rotation of cyclone 10 makes flue gas spiral.
The described periphery along corrugated plate dst catalyst layer 9, is intervally distributed with multiple soot blower 7 from bottom to top, and soot blower 7 is attached to the dust stratification on corrugated plate dst catalyst layer 9 surface for blowing off.Soot blower 7 connects outside high steam or compressed air, is blown off be attached to dust stratification on corrugated plate dst catalyst layer 9 by high velocity air.Both decreased dust stratification and blocking, alleviated catalyst failure, and made again catalyst service efficiency reach higher level.
Each vortex atomizing nozzle 8 connects the ammonia feed system be arranged on outside desulfurizing tower by pipeline.Described ammonia feed system comprise liquid ammonia storage tank 6 that pipeline successively connects, for liquefied ammonia is evaporated liquid ammonia evaporator 5, for ammonia is cushioned ammonia dashpot 4, for ammonia/air mixer 3 of mixing ammonia and air and the dilution air 2 for diluting ammonia;
Described ammonia/air mixer 3 connects vortex atomizing nozzle 8 by one with the pipeline of magnetic valve 13; The outside of described denitrating tower body is also provided with a escaping of ammonia feedback control system 1, and the exhanst gas outlet of described denitrating tower bodies top is provided with the probe 12 for detecting ammonia density; The concentration data of the ammonia that the escaping of ammonia feedback control system 1 detects according to probe 12, controlling the aperture of ammonia feed system and magnetic valve 13, for controlling the straying quatity of vortex atomizing nozzle 8 pairs of ammonia in real time, making to spray into the ammonia amount in exhaust gases passes and NO
xconcentration matches.
Described denitrating tower body bottom portion is provided with dust stratification case 11, for receiving the dust stratification fallen by corrugated plate dst catalyst layer 9 blowing up.The middle part of dust stratification case 11 has the tubaeform through hole passed through for flue gas.Tubaeform being beneficial to reduces the speed of service of flue gas along exhaust gases passes direction.
The denitrification process of spiral-flow plate-type SCR denitration tower of the present invention, realizes by following method:
The cyclone 10 that flue gas is arranged by the smoke inlet place of denitrating tower body lower part, under the blade rotation effect of cyclone 10, flow-disturbing is carried out to flue gas, make flue gas spiral and enter to form in exhaust gases passes by corrugated plate dst catalyst layer 9, when the ammonia that spiralling flue gas and vortex atomizing nozzle 8 spray meets, because ammonia is sprayed along circle of contact direction by vortex atomizing nozzle 8 eddy flow, spiralling flue gas and ammonia are entrainmented mutually mix, and along the inner periphery direction by exhaust gases passes with the mode spiral of the circle of contact, repeatedly corrugated plate dst catalyst layer 9 is tangentially washed away in uphill process, and there is catalytic reduction reaction, increase the specific area contacted with corrugated plate dst catalyst layer 9, achieve denitrating flue gas.
When probe 12 detects that the concentration of ammonia in flue gas is greater than preset value, the ammonia density data that the escaping of ammonia feedback control system 1 is fed back according to this probe 12, control the aperture of ammonia feed system and magnetic valve 13, for controlling the straying quatity of vortex atomizing nozzle 8 pairs of ammonia in real time, make to spray into the ammonia amount in exhaust gases passes and NO
xconcentration and preset value match.
Certainly, the flue gas of denitrating tower of the present invention also can be arranged to enter tower bottom flow from tower top and go out, and now, also tackle miscellaneous part and adjust accordingly, as cyclone 10 is placed in tower top, probe 12 is arranged on tower bottom outlet position etc.The present invention is also applicable to flat catalyst.
As mentioned above, just the present invention can be realized preferably.
Embodiments of the present invention are not restricted to the described embodiments; other are any do not deviate from Spirit Essence of the present invention and principle under do change, modification, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1. a spiral-flow plate-type SCR denitration tower, is characterized in that: the corrugated plate dst catalyst layer (9) comprising denitrating tower body and arrange along the inner peripheral surface of denitrating tower body; Corrugated plate dst catalyst layer (9) forms exhaust gases passes;
Along the periphery of corrugated plate dst catalyst layer (9), be distributed with multiple vortex atomizing nozzles (8) that multilayer is sprayed along circle of contact direction from bottom to top; When flue gas to be entered in exhaust gases passes by the bottom of denitrating tower body and meets with the ammonia that vortex atomizing nozzle (8) sprays, because ammonia sprays along circle of contact direction eddy flow, flue gas and ammonia are entrainmented mutually mix, and along the inner periphery direction by exhaust gases passes with the mode spiral of the circle of contact; Each vortex atomizing nozzle (8) connects the ammonia feed system be arranged on outside desulfurizing tower by pipeline.
2. spiral-flow plate-type SCR denitration tower according to claim 1, is characterized in that: the smoke inlet place of described denitrating tower body lower part is provided with cyclone (10), and the blade rotation of cyclone (10) makes flue gas spiral.
3. spiral-flow plate-type SCR denitration tower according to claim 1, it is characterized in that: the described periphery along corrugated plate dst catalyst layer (9), be intervally distributed with multiple soot blower (7) from bottom to top, soot blower (7) is attached to the dust stratification on corrugated plate dst catalyst layer (9) surface for blowing off.
4. spiral-flow plate-type SCR denitration tower according to any one of claim 1 to 3, is characterized in that: described ammonia feed system comprise liquid ammonia storage tank (6) that pipeline successively connects, for liquefied ammonia is evaporated liquid ammonia evaporator (5), for ammonia is cushioned ammonia dashpot (4), for ammonia/air mixer (3) of mixing ammonia and air and the dilution air (2) for diluting ammonia;
Described ammonia/air mixer (3) by one with magnetic valve (13) pipeline connect vortex atomizing nozzle (8); The outside of described denitrating tower body is also provided with a escaping of ammonia feedback control system (1), and the exhanst gas outlet of described denitrating tower bodies top is provided with the probe (12) for detecting ammonia density; The concentration data of the ammonia that the escaping of ammonia feedback control system (1) detects according to probe (12), control the aperture of ammonia feed system and magnetic valve (13), for controlling vortex atomizing nozzle (8) in real time to the straying quatity of ammonia, make to spray into the ammonia amount in exhaust gases passes and NO
xconcentration matches.
5. spiral-flow plate-type SCR denitration tower according to claim 4, is characterized in that: described denitrating tower body bottom portion is provided with dust stratification case (11), and the middle part of dust stratification case (11) has the tubaeform through hole passed through for flue gas.
6. a spiral-flow plate-type SCR denitration method, it is characterized in that adopting spiral-flow plate-type SCR denitration tower according to any one of claim 1 to 5 to realize, concrete steps are as follows:
The cyclone (10) that flue gas is arranged by the smoke inlet place of denitrating tower body lower part, under the blade rotation effect of cyclone (10), flow-disturbing is carried out to flue gas, make flue gas spiral and enter to form in exhaust gases passes by corrugated plate dst catalyst layer (9), when the ammonia that spiralling flue gas and vortex atomizing nozzle (8) spray meets, because ammonia is sprayed along circle of contact direction by vortex atomizing nozzle (8) eddy flow, spiralling flue gas and ammonia are entrainmented mutually mix, and along the inner periphery direction by exhaust gases passes with the mode spiral of the circle of contact, corrugated plate dst catalyst layer (9) is repeatedly tangentially washed away in uphill process, and there is catalytic reduction reaction, increase flue gas, the specific area that ammonia contacts with corrugated plate dst catalyst layer (9), achieve denitrating flue gas.
7. spiral-flow plate-type SCR denitration method according to claim 6, is characterized in that, also comprises a escaping of ammonia FEEDBACK CONTROL step:
When pop one's head in (12) detect that the concentration of ammonia in flue gas is greater than preset value, the ammonia density data that the escaping of ammonia feedback control system (1) is fed back according to this probe (12), control the aperture of ammonia feed system and magnetic valve (13), for controlling vortex atomizing nozzle (8) in real time to the straying quatity of ammonia, make to spray into the ammonia amount in exhaust gases passes and NO
xconcentration and preset value match.
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| CN108434987A (en) * | 2018-06-12 | 2018-08-24 | 朋仁锋 | A kind of thermal power plant's SCR denitration catalytic reaction device |
| CN108744968A (en) * | 2018-06-12 | 2018-11-06 | 朋仁锋 | A kind of coal steam-electric plant smoke treatment process |
| CN109745776A (en) * | 2019-03-11 | 2019-05-14 | 西安交通大学 | A kind of cyclone dust collector and its operating method |
| CN110368787A (en) * | 2019-07-24 | 2019-10-25 | 无锡市道格环保科技有限公司 | A kind of ozone denitration injection evenly mixing device |
| CN110455090A (en) * | 2019-09-10 | 2019-11-15 | 佛山科学技术学院 | A kind of efficient swirling flow atomizing desulfurization and dust-removal method |
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| CN106902660A (en) * | 2017-03-20 | 2017-06-30 | 北京清新环境技术股份有限公司 | A kind of ammonia jet mixing device for SCR Flue Gas Denitrification Engineerings |
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| CN108744968A (en) * | 2018-06-12 | 2018-11-06 | 朋仁锋 | A kind of coal steam-electric plant smoke treatment process |
| CN109745776A (en) * | 2019-03-11 | 2019-05-14 | 西安交通大学 | A kind of cyclone dust collector and its operating method |
| CN109745776B (en) * | 2019-03-11 | 2020-03-17 | 西安交通大学 | Cyclone dust removal device and operation method thereof |
| CN110368787A (en) * | 2019-07-24 | 2019-10-25 | 无锡市道格环保科技有限公司 | A kind of ozone denitration injection evenly mixing device |
| CN110368787B (en) * | 2019-07-24 | 2021-08-06 | 无锡市道格环保科技有限公司 | Ozone denitration sprays mixing device |
| CN110455090A (en) * | 2019-09-10 | 2019-11-15 | 佛山科学技术学院 | A kind of efficient swirling flow atomizing desulfurization and dust-removal method |
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