CN108854530A - A kind of wide load SCR denitration device of middle low temperature and method of denitration - Google Patents
A kind of wide load SCR denitration device of middle low temperature and method of denitration Download PDFInfo
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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
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- B01D53/8625—Nitrogen oxides
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Abstract
A kind of wide load SCR denitration device of middle low temperature of the present invention and method of denitration, including high temperature electric precipitation rear pass, flue deflector, entrance guiding plate, exhaust pass, flow straightening grid, ammonia-spraying grid, in low-temperature catalyzed oxidant layer and high temperature catalyst layer, in above low-temperature catalyzed oxidant layer, in flow straightening grid and ammonia-spraying grid are set between low-temperature catalyzed oxidant layer and high temperature catalyst layer, external flue gas via high temperature electric precipitation rear pass and flue deflector enter denitrification apparatus body interior pass through again in low-temperature catalyzed oxidant layer and high temperature catalyst layer catalytic denitration, gas after denitration is discharged via exhaust pass, by ammonia-spraying grid spray ammonia and with the NO in flue gasxDenitration reaction is carried out under the action of catalyst.The wide load SCR denitration device of middle low temperature provided by the invention and method of denitration, handle flue gas NO after dedustingx, to reach boiler under load variations, NO_x Reduction by Effective is carried out under flue-gas temperature, flowed fluctuation, can utmostly save equipment investment and operating cost.
Description
Technical field
The present invention relates to gas denitrifying technology fields, and in particular to a kind of wide load SCR denitration device of middle low temperature and denitration
Method.
Background technique
Nitrogen oxides（NOx）It is one of the important pollutant in atmosphere, the atmosphere pollution such as acid rain, photochemical pollution can be caused
Problem, the discharge of NOx are derived mainly from a large amount of burnings of fossil fuel, the especially industries such as thermoelectricity, metallurgy, building materials, are China NOx
The main source of discharge, but with China's expanding economy, the discharge standard of NOx is more and more harsh.Therefore, it is necessary to higher
Effect, more fully NOx control technology.
Selective catalytic reduction（SCR）Technology is most effective NOx control technology generally acknowledged at present, and denitration efficiency reaches as high as
It is denitration technology the most mature, principle is under the effect of the catalyst, with NH to 90% or more3For reducing agent, preferentially with
NOx reduction in flue gas generates nitrogen and water.The effecting reaction temperature window of general catalyst is between 300 DEG C -400 DEG C.For
Meet the suitable reaction temperature of SCR catalyst, SCR reactor is all set to boiler economizer outlet and air preheater at present
Between entrance.
Some industries, especially thermal power plant the case where there are boiler load variations, therefore the flue gas temperature before its denitration reaction
Degree and exhaust gas volumn have very big fluctuation, and flue-gas temperature can generally change between 180 DEG C -410 DEG C.How wide load is realized
SCR denitration is a meaningful problem.If the low temperature catalyst in（Catalytic reaction temperature is at 180 DEG C -300 DEG C）Come
The problems such as meeting the denitration efficiency in the case of boiler at low load, will lead to the increase of denitrification apparatus volume, catalyst cost increase.
Summary of the invention
In order to solve the problems existing in the prior art, the present invention provides the wide load SCR denitration devices of a kind of middle low temperature and de-
Nitre method.
To achieve the above object, the technical solution adopted by the present invention is：
A kind of wide load SCR denitration device of middle low temperature, including denitrification apparatus ontology are provided with high temperature on the denitrification apparatus ontology
Electric precipitation rear pass, flue deflector, entrance guiding plate and exhaust pass, denitrification apparatus body interior be provided with flow straightening grid,
Ammonia-spraying grid, in low-temperature catalyzed oxidant layer and high temperature catalyst layer, in above low-temperature catalyzed oxidant layer, in low-temperature catalyzed oxidant layer and in
Flow straightening grid and ammonia-spraying grid are respectively provided between high-temperature catalytic oxidant layer, external flue gas is led via high temperature electric precipitation rear pass and flue
Flowing plate enter denitrification apparatus body interior pass through again in low-temperature catalyzed oxidant layer and high temperature catalyst layer catalytic denitration, after denitration
Gas is discharged via exhaust pass, changes airflow direction by entrance guiding plate and flow straightening grid, sprays ammonia by ammonia-spraying grid
Gas simultaneously carries out denitration reaction with the NOx in flue gas under the action of catalyst.
Further, the denitrification apparatus body interior also sets up preparing catalyst layer, and denitrification apparatus body interior is by upper
Set gradually under flow straightening grid, ammonia-spraying grid, in low-temperature catalyzed oxidant layer, two layers of high temperature catalyst layer and preparing catalyst
Layer, flow straightening grid and ammonia-spraying grid be respectively equipped with two, in above low-temperature catalyzed oxidant layer, in low-temperature catalyzed oxidant layer and high temperature urge
A flow straightening grid and an ammonia-spraying grid are respectively provided between agent layer.
Further, the ammonia-spraying grid sprays grid using static mixing type, is respectively provided with several sprays on ammonia-spraying grid
Mouth simultaneously sprays the ammonia in ammonia-spraying grid by nozzle and reacts flue gas with ammonia, realizes denitration, ammonia straying quatity and flue gas
Middle NOxMolar ratio be 0.95 ~ 1.04：1.
Further, temperature sensor is also set up on the ammonia-spraying grid, is used for real-time monitoring denitrification apparatus body interior
Temperature change, temperature sensor is connected with monitoring center and real time temperature data is transmitted to monitoring center, engineering staff's root
According to the ammonia spraying amount of temperature change modulation ammonia-spraying grid.
Further, smoke inlet is set above the denitrification apparatus ontology, is provided with flue deflector at smoke inlet
With entrance guiding plate, external flue gas via smoke inlet flow into again successively via high temperature electric precipitation rear pass and flue deflector into
Entering denitrification apparatus body interior, flue deflector is parallel to high temperature electric precipitation rear pass, and the dog-ear of entrance guiding plate is 130 ~
150 °, airflow direction is changed by entrance guiding plate and flow straightening grid, exhaust pass is arranged in denitrification apparatus body bottom portion, is used for
The gas inside denitrification apparatus is discharged.
Further, the denitrification apparatus bodies top is the inclined surface that inclination angle is 30 ~ 40 °, denitrification apparatus body housing
With horizontal plane at 80 ~ 85 ° of angles.
Further, the metal-modified vanadium tungsten titanium denitrating catalyst of the middle low temperature catalyst layer choosing transition or transition gold
Belong to modified molecular sieve catalyst, high temperature catalyst layer selects conventional vanadium tungsten titanium denitrating catalyst, and preparing catalyst layer choosing is used
Transition metal modified vanadium tungsten titanium denitrating catalyst, transition metal modified molecular sieve catalyst or conventional vanadium tungsten titanium denitration catalyst
Agent.
Further, it by the temperature of temperature sensor real-time monitoring denitrification apparatus body interior and is sent in monitoring
The heart, engineering staff are 180 ~ 250 in the temperature of denitrification apparatus body interior according to the ammonia spraying amount of temperature change modulation ammonia-spraying grid
DEG C when, be only located in ammonia-spraying grid above low-temperature catalyzed oxidant layer ammonia is sprayed by nozzle, mix flue gas with ammonia, it is low in
The catalytic action of warm catalyst layer is by NOxIt is converted to N2With part N2O, remaining NOxBy high temperature catalyst layer and spare urge
Agent layer further reacts, and is converted into N2, it is discharged by exhaust pass；
The temperature of denitrification apparatus body interior at 250 ~ 410 DEG C, be located in ammonia-spraying grid above low-temperature catalyzed oxidant layer, in it is low
Ammonia-spraying grid between warm catalyst layer and high temperature catalyst layer starts to spray ammonia, and flue gas is mixed with ammonia, urged by middle low temperature
The catalytic action of agent layer and high temperature catalyst layer is by the NO in flue gasxAnd N2O is converted into N2, subsequent gas continue to flow down
It is dynamic, by preparing catalyst layer by remaining NOxIt is converted into N2, it is discharged by exhaust pass.
Compared with prior art, beneficial effects of the present invention are：
1）Wide temperature window denitrification apparatus provided by the invention solve thermal power plant because boiler load variation caused by flue-gas temperature,
It cannot achieve NO under air speed variationxRemoval, the problem for stablizing denitration ensure that denitration effect of the flue gas in the lower situation of temperature
Rate, it is ensured that boiler realizes under load variations, flue-gas temperature, the NO_x Reduction by Effective under flowed fluctuation, can utmostly save equipment
Investment and operating cost；
2）Denitrification apparatus provided by the invention may be arranged at deduster rear, the cigarette for handling flue gas NOx after dedusting, in flue gas
Gas dustiness is very low,（10~100mg/Nm3）, can be with so that the blockage and wear problem of catalyst surface will not be caused
The abrasion of catalyst and catalytic unit is utmostly avoided, reactor lifetime is extended, operating cost is reduced and catalyst regeneration is thrown
Enter；
3）The metal-modified middle low-temperature denitration catalyst of middle low temperature catalyst layer choosing transition that the present invention uses, solves low temperature
Poisoning of the lower catalyst to ammonium hydrogen sulfate, and when flue-gas temperature raising, the decomposition of ammonium hydrogen sulfate can also make denitrification apparatus and take off
The service life of denox catalyst greatly prolongs, it is ensured that wide temperature window of the flue-gas temperature at 180 ~ 410 DEG C, air speed 20000 ~
50000h-1Variation under, guarantee denitration efficiency 90% or more；
4）Denitrification apparatus provided by the invention can effectively reduce catalyst loading, guarantee catalysis in three-dimensional trapezium structure is inverted
The utilization rate of agent substantially reduces catalyst cost.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Wherein, 1, high temperature electric precipitation rear pass；2, flue deflector；3, entrance guiding plate；4, flow straightening grid；5, ammonia-spraying grid；
6, temperature sensor；7, low-temperature catalyzed oxidant layer in；8, high temperature catalyst layer；9, preparing catalyst layer；10, exhaust pass.
Specific embodiment
The present invention will be further explained combined with specific embodiments below.
As shown in Figure 1, a kind of wide load SCR denitration device of middle low temperature, is set to after deduster, including denitrification apparatus sheet
Body is provided with smoke inlet, high temperature electric precipitation rear pass 1, flue deflector 2, entrance guiding plate 3, whole on denitrification apparatus ontology
Flow grid 4, ammonia-spraying grid 5, temperature sensor 6, in low-temperature catalyzed oxidant layer 7, high temperature catalyst layer 8,9 and of preparing catalyst layer
Exhaust pass 10, smoke inlet are arranged above denitrification apparatus ontology, and external flue gas flows into denitrification apparatus via smoke inlet
Inside, exhaust pass 10 are arranged in denitrification apparatus body bottom portion, for the gas inside denitrification apparatus, denitrification apparatus ontology to be discharged
Top is the inclined surface that inclination angle is 30 ~ 40 °, denitrification apparatus body housing and horizontal plane into 80 ~ 85 ° of angles, denitrification apparatus ontology
In three-dimensional class trapezium structure is inverted, flue deflector 2 and entrance guiding plate 3 are provided at smoke inlet, flue deflector 2 is parallel
In high temperature electric precipitation rear pass 1, the dog-ear of entrance guiding plate 3 is 130 ~ 150 °, is changed by entrance guiding plate 3 and flow straightening grid 4
Become airflow direction, high temperature electric precipitation rear pass 1 is flowed into again successively via cigarette by smoke inlet by the flue gas of cleaner discharge
Road deflector 2 and entrance guiding plate 3 enter the denitration of denitrification apparatus body interior, low-temperature catalyzed oxidant layer 7 and middle height in flue gas process
Warm 8 catalytic denitration of catalyst layer, realization NOx conversion are N2, remaining NOx is converted into N by preparing catalyst layer 92, then via out
Acceptable gas N is outwardly discharged in mouth flue 102, inlet flue gas dustiness is 0 ~ 100mg/Nm3。
Denitrification apparatus body interior be from top to bottom disposed with flow straightening grid 4, ammonia-spraying grid 5, in low-temperature catalyzed oxidant layer
7, flow straightening grid 4, ammonia-spraying grid 5, two layers of high temperature catalyst layer 8 and preparing catalyst layer 9, flow straightening grid 4 and ammonia-spraying grid 5
Be respectively equipped with two, in be provided with a flow straightening grid 4 and ammonia-spraying grid 5 above low-temperature catalyzed oxidant layer 7, in low-temperature catalyzed oxidant layer
Another flow straightening grid 4 and ammonia-spraying grid 5 are provided between 7 and high temperature catalyst layer 8, ammonia-spraying grid 5 uses static mixing
Formula sprays grid, several nozzles are respectively provided on each ammonia-spraying grid 5 and sprays the ammonia in ammonia-spraying grid 5 by nozzle and makes
Flue gas is reacted with ammonia, realizes denitration, and the molar ratio of NOx is 0.95 ~ 1.04 in ammonia straying quatity and flue gas：1, each spray ammonia lattice
Temperature sensor 6 is also set up on grid 5, for the temperature change of real-time monitoring denitrification apparatus body interior, temperature sensor 6 and prison
Control center is connected and real time temperature data is transmitted to monitoring center, and engineering staff is according to temperature change modulation ammonia-spraying grid 5
Ammonia spraying amount, so as to realize wide load denitration according to the variation of flue-gas temperature and air speed.
In low-temperature catalyzed oxidant layer 7 select transition metal modified vanadium tungsten titanium denitrating catalyst or transition metal modified molecule
Sieve catalyst, high temperature catalyst layer 8 select conventional vanadium tungsten titanium denitrating catalyst, and preparing catalyst layer 9 selects transition metal to change
Property vanadium tungsten titanium denitrating catalyst, transition metal modified molecular sieve catalyst or conventional vanadium tungsten titanium denitrating catalyst.
The denitration principle of the middle wide load SCR denitration device of low temperature is：
When the temperature of denitrification apparatus body interior is at 180 ~ 250 DEG C, be only located in 7 top of low-temperature catalyzed oxidant layer spray ammonia lattice
Grid 5 spray ammonia by nozzle, mix flue gas with ammonia, NO of the ammonia in middle low temperature catalyst surface and flue gasxNH occurs3-
SCR reaction, by the NO in flue gasxIt is converted into N2With the N of part2O, remaining NOxBy high temperature catalyst layer 8 and spare urge
Agent layer 9 further reacts, and is converted into N2, then via the discharge of exhaust pass 10.
When the temperature of denitrification apparatus body interior is at 250 ~ 410 DEG C, be located in 7 top of low-temperature catalyzed oxidant layer spray ammonia lattice
Grid 5, in ammonia-spraying grid 5 between low-temperature catalyzed oxidant layer 7 and high temperature catalyst layer 8 begin through nozzle spray ammonia, flue gas and ammonia
Gas mixing, the catalytic action of low-temperature catalyzed oxidant layer 7 and high temperature catalyst layer 8 is by the NO in flue gas inxAnd N2O is converted into
N2, subsequent gas continues to flow downward, by preparing catalyst layer 9 by remaining NOxIt is converted into N2, then via exhaust pass 10
Discharge, guarantees the denitration efficiency of denitrification apparatus, while reducing the escaping of ammonia to the greatest extent, reduce the production of ammonium hydrogen sulfate to catalyst and after
The corrosiveness of continuous equipment.
Embodiment 1
As shown in Figure 1, a kind of wide load SCR denitration device of middle low temperature, is set to after deduster, including denitrification apparatus ontology,
High temperature electric precipitation rear pass 1, flue deflector 2, entrance guiding plate 3, flow straightening grid 4, spray ammonia are provided on denitrification apparatus ontology
Grid 5, temperature sensor 6, in low-temperature catalyzed oxidant layer 7, high temperature catalyst layer 8, preparing catalyst layer 9 and exhaust pass 10,
Smoke inlet is arranged above denitrification apparatus ontology, and exhanst gas outlet is arranged on denitrification apparatus body bottom portion, denitrification apparatus ontology top
Portion is the inclined surface that inclination angle is 30 ~ 40 °, denitrification apparatus body housing and horizontal plane into 80 ~ 85 ° of angles, is arranged at smoke inlet
There are flue deflector 2 and entrance guiding plate 3, flue deflector 2 is parallel to high temperature electric precipitation rear pass 1, the folding of entrance guiding plate 3
Angle is 130 ~ 150 °, changes airflow direction by entrance guiding plate 3 and flow straightening grid 4, is passed through by the flue gas that cleaner is discharged
Smoke inlet flows into high temperature electric precipitation rear pass 1 and successively enters denitrification apparatus sheet via flue deflector 2 and entrance guiding plate 3 again
Internal portion's denitration, flue gas pass through in low-temperature catalyzed oxidant layer 7, high temperature catalyst layer 8, preparing catalyst layer 9 realize NOxIt is converted into
N2, then via exhaust pass 10 acceptable gas N is outwardly discharged2, inlet flue gas dustiness is 0 ~ 100mg/Nm3。
Denitrification apparatus body interior be from top to bottom disposed with flow straightening grid 4, ammonia-spraying grid 5, in low-temperature catalyzed oxidant layer
7, flow straightening grid 4, ammonia-spraying grid 5, two layers of high temperature catalyst layer 8 and preparing catalyst layer 9, two layers of high temperature catalyst layer 8
Between enough gaps are set, flow straightening grid 4 and ammonia-spraying grid 5 are respectively equipped with two, in be provided with one above low-temperature catalyzed oxidant layer 7
A flow straightening grid 4 and ammonia-spraying grid 5, in be provided with another honeycomb screen between low-temperature catalyzed oxidant layer 7 and high temperature catalyst layer 8
Grid 4 and ammonia-spraying grid 5, ammonia-spraying grid 5 spray grid using static mixing type, are respectively provided with several sprays on each ammonia-spraying grid 5
Mouth simultaneously sprays the ammonia in ammonia-spraying grid 5 by nozzle and reacts flue gas with ammonia, realizes denitration, ammonia straying quatity and flue gas
Middle NOxMolar ratio be 0.95 ~ 1.04：1, temperature sensor 6 is also set up on each ammonia-spraying grid 5, is used for real-time monitoring denitration
Temperature change inside device noumenon, temperature sensor 6 are connected with monitoring center and real time temperature data are transmitted in monitoring
The heart, engineering staff is according to the ammonia spraying amount of temperature change modulation ammonia-spraying grid 5, so as to according to the variation of flue-gas temperature and air speed,
Realize wide load denitration.
O in simulated flue gas2Volume fraction is 6%, NOxConcentration is 2000ppm, balanced gas N2, air speed is
23000h-1, flue gas flow 80L/h, control flue-gas temperature at 180 ~ 250 DEG C, steadily accelerate by denitrification apparatus inside smoke flow velocity,
In low-temperature catalyzed oxidant layer 7 and preparing catalyst layer 9 select Mn-V-W-Ti System Catalyst, high temperature catalyst layer 8 selects V-W-
Ti System Catalyst, the time of contact for controlling flue gas and catalyst is 200ms or so, is conducive to reaction gas in catalyst micropore
Interior diffusion, absorption, reaction and the desorption of product and diffusion.
External flue gas successively flows into high temperature electric precipitation rear pass 1 and flue via the smoke inlet above denitrification apparatus ontology
Deflector 2 enters back into inside denitrification apparatus, changes airflow direction by entrance guiding plate 3 and flow straightening grid 4, be located in it is low-temperature catalyzed
The ammonia-spraying grid 5 of 7 top of oxidant layer sprays ammonia, NO of the ammonia in low-temperature catalyzed 7 surface of oxidant layer and flue gasxNH occurs3- SCR is anti-
It answers, by the NO in flue gasxIt is converted into N2With the N of part2O, remaining NOxFlow downwardly and through high temperature catalyst layer 8 and standby
It is further reacted with catalyst layer 9, is converted into N2, wherein ammonia and NOxMolar ratio be 0.95 ~ 1.04：1, flue gas pass through in it is low
NO after warm catalyst layer 7xConversion ratio 75 ~ 80%, further by after high temperature catalyst layer 8 and preparing catalyst layer 9,
NOxConversion ratio can achieve 90% or more, acceptable gas is discharged by exhaust pass 10, in low-temperature catalyzed oxidant layer 7, in
High-temperature catalytic oxidant layer 8, preparing catalyst layer 9 realize 90% or more N2Conversion, guarantees the denitration efficiency of denitrification apparatus, simultaneously to the greatest extent
Amount reduces the escaping of ammonia, reduces corrosiveness of the production to catalyst and follow-up equipment of ammonium hydrogen sulfate.
Embodiment 2
O in simulated flue gas2Volume fraction is 6%, NOxConcentration is 2000ppm, balanced gas N2, air speed 50000h-1,
Flue gas flow is 80L/h, controls flue-gas temperature at 250-410 DEG C, denitrification apparatus inside smoke flow velocity is steadily accelerated, and middle low temperature is urged
Agent layer 7 and preparing catalyst layer 9 select Mn-V-W-Ti System Catalyst, and high temperature catalyst layer selection V-W-Ti system is urged
Agent, the time of contact for controlling flue gas and catalyst is 200ms or so, is conducive to expansion of the reaction gas in catalyst micropore
Scattered, absorption, reaction and the desorption and diffusion of product.
Inlet flue gas enters inside denitrification apparatus through high temperature electric precipitation rear pass 1 and flue deflector 2, by entrance guiding plate
3 and flow straightening grid 4 change airflow direction, in 7 top of low-temperature catalyzed oxidant layer ammonia-spraying grid 5 and in low-temperature catalyzed 7 He of oxidant layer
Ammonia-spraying grid 5 between high temperature catalyst layer 8 sprays ammonia, NO of the flue gas in low-temperature catalyzed 7 surface of oxidant layer and flue gasxOccur
NH3- SCR reaction, by the part NO in flue gasxIt is converted into N2With the N of part2O, in after low-temperature catalyzed oxidant layer 7, NOxTurn
Rate is in 30 ~ 40%, NOxIt continues through high temperature catalyst layer 8 further to react, is converted into N2, pass through high temperature catalyst layer 8
NO afterwardsxConversion ratio 85 ~ 90%, remaining flue gas is further reacted by preparing catalyst layer 9, is converted into N2, then via outlet
Flue 10 is discharged outside to, wherein ammonia and NOxMolar ratio be 0.95 ~ 1.04：1, flue gas passes through 8 He of high temperature catalyst layer
After preparing catalyst layer 9, NOxConversion ratio can achieve 95% or more.
Remaining same embodiment 1.
The above embodiments do not limit the invention in any form, all to be obtained by the way of equivalent substitution or equivalent transformation
Technical solution, all fall within protection scope of the present invention.
Claims (8)
1. a kind of wide load SCR denitration device of middle low temperature, including denitrification apparatus ontology, which is characterized in that the denitrification apparatus sheet
High temperature electric precipitation rear pass is provided on body（1）, flue deflector（2）, entrance guiding plate（3）And exhaust pass（10）, denitration
Device noumenon is internally provided with flow straightening grid（4）, ammonia-spraying grid（5）, in low-temperature catalyzed oxidant layer（7）With high temperature catalyst layer
（8）, in low-temperature catalyzed oxidant layer（7）Top, in low-temperature catalyzed oxidant layer（7）With high temperature catalyst layer（8）Between be respectively provided with rectification
Grid（4）And ammonia-spraying grid（5）, external flue gas is via high temperature electric precipitation rear pass（1）With flue deflector（2）It is filled into denitration
Set body interior pass through again in low-temperature catalyzed oxidant layer（7）With high temperature catalyst layer（8）Catalytic denitration, gas after denitration via
Exhaust pass（10）Discharge, passes through entrance guiding plate（3）And flow straightening grid（4）Change airflow direction, passes through ammonia-spraying grid（5）Spray
Out ammonia and denitration reaction is carried out under the action of catalyst with the NOx in flue gas.
2. a kind of middle wide load SCR denitration device of low temperature according to claim 1, which is characterized in that the denitrification apparatus
Body interior also sets up preparing catalyst layer（9）, denitrification apparatus body interior from top to bottom sets gradually flow straightening grid（4）, spray
Ammonia grid（5）, in low-temperature catalyzed oxidant layer（7）, two layers of high temperature catalyst layer（8）With preparing catalyst layer（9）, flow straightening grid
（4）And ammonia-spraying grid（5）Be respectively equipped with two, in low-temperature catalyzed oxidant layer（7）Top, in low-temperature catalyzed oxidant layer（7）And high temperature
Catalyst layer（8）Between be respectively provided with a flow straightening grid（4）With an ammonia-spraying grid（5）.
3. a kind of middle wide load SCR denitration device of low temperature according to claim 1, which is characterized in that the ammonia-spraying grid
（5）Grid, ammonia-spraying grid are sprayed using static mixing type（5）On be respectively provided with several nozzles and ammonia-spraying grid sprayed by nozzle
（5）Interior ammonia simultaneously reacts flue gas with ammonia, realizes denitration, NO in ammonia straying quatity and flue gasxMolar ratio be 0.95 ~
1.04：1.
4. a kind of middle wide load SCR denitration device of low temperature according to claim 1, which is characterized in that the ammonia-spraying grid
（5）On also set up temperature sensor（6）, for the temperature change of real-time monitoring denitrification apparatus body interior, temperature sensor（6）
It is connected with monitoring center and real time temperature data is transmitted to monitoring center, engineering staff is according to temperature change modulation ammonia-spraying grid
（5）Ammonia spraying amount.
5. a kind of middle wide load SCR denitration device of low temperature according to claim 1, which is characterized in that the denitrification apparatus
Smoke inlet is set above ontology, is provided with flue deflector at smoke inlet（2）With entrance guiding plate（3）, external flue gas warp
It is flowed by smoke inlet again successively via high temperature electric precipitation rear pass（1）With flue deflector（2）Into in denitrification apparatus ontology
Portion, flue deflector（2）It is parallel to high temperature electric precipitation rear pass（1）, entrance guiding plate（3）Dog-ear be 130 ~ 150 °, pass through
Entrance guiding plate（3）And flow straightening grid（4）Change airflow direction, exhaust pass（10）Setting is used in denitrification apparatus body bottom portion
Gas inside discharge denitrification apparatus.
6. a kind of middle wide load SCR denitration device of low temperature according to claim 1, which is characterized in that the denitrification apparatus
Bodies top is the inclined surface that inclination angle is 30 ~ 40 °, denitrification apparatus body housing and horizontal plane into 80 ~ 85 ° of angles.
7. a kind of middle wide load SCR denitration device of low temperature according to claim 1, which is characterized in that the middle low temperature is urged
Agent layer（7）Select transition metal modified vanadium tungsten titanium denitrating catalyst or transition metal modified molecular sieve catalyst, middle height
Warm catalyst layer（8）Select conventional vanadium tungsten titanium denitrating catalyst, preparing catalyst layer（9）Select transition metal modified vanadium tungsten titanium
Denitrating catalyst, transition metal modified molecular sieve catalyst or conventional vanadium tungsten titanium denitrating catalyst.
8. a kind of method of denitration of -7 any middle wide load SCR denitration devices of low temperature, feature exist according to claim 1
In passing through temperature sensor（6）The temperature of real-time monitoring denitrification apparatus body interior is simultaneously sent to monitoring center, engineering staff's root
According to temperature change modulation ammonia-spraying grid（5）Ammonia spraying amount, when the temperature of denitrification apparatus body interior is 180 ~ 250 DEG C, only position
The low-temperature catalyzed oxidant layer in（7）The ammonia-spraying grid of top（5）Ammonia is sprayed by nozzle, flue gas is mixed with ammonia, passes through middle low temperature
Catalyst layer（7）Catalytic action by NOxIt is converted to N2With part N2O, remaining NOxPass through high temperature catalyst layer（8）With it is standby
Use catalyst layer（9）Further reaction, is converted into N2, pass through exhaust pass（10）Discharge；
The temperature of denitrification apparatus body interior at 250 ~ 410 DEG C, be located in low-temperature catalyzed oxidant layer（7）The ammonia-spraying grid of top
（5）, in low-temperature catalyzed oxidant layer（7）With high temperature catalyst layer（8）Between ammonia-spraying grid（5）Start to spray ammonia, flue gas and ammonia
Mixing, the low-temperature catalyzed oxidant layer in（7）With high temperature catalyst layer（8）Catalytic action by the NO in flue gasxAnd N2O conversion
For N2, subsequent gas continues to flow downward, and passes through preparing catalyst layer（9）By remaining NOxIt is converted into N2, pass through exhaust pass
（10）Discharge.
Priority Applications (1)
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| CN109603538A (en) * | 2019-01-22 | 2019-04-12 | 山东景耀玻璃集团有限公司 | Kiln exhuast gas desulfurization denitration dust collecting waste heat recycles integrated technology |
| CN111389219A (en) * | 2020-03-27 | 2020-07-10 | 浙江浙能技术研究院有限公司 | Ammonia injection control method for start-stop stage of coal-fired boiler |
| CN111664717B (en) * | 2020-05-25 | 2022-07-01 | 中钢集团天澄环保科技股份有限公司 | Intelligent catalytic denitration CO removal and waste heat utilization integrated device |
| CN111664717A (en) * | 2020-05-25 | 2020-09-15 | 中钢集团天澄环保科技股份有限公司 | Intelligent catalytic denitration CO removal and waste heat utilization integrated device |
| CN111545028A (en) * | 2020-06-22 | 2020-08-18 | 北京晨晰环保工程有限公司 | Integrative device of SOx/NOx control |
| CN112379035A (en) * | 2020-10-28 | 2021-02-19 | 山东电力研究院 | System and method for evaluating performance of catalyst of SCR (selective catalytic reduction) denitration device on line |
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