CN105582808A - SCR denitration device and method - Google Patents
SCR denitration device and method Download PDFInfo
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- CN105582808A CN105582808A CN201610143114.0A CN201610143114A CN105582808A CN 105582808 A CN105582808 A CN 105582808A CN 201610143114 A CN201610143114 A CN 201610143114A CN 105582808 A CN105582808 A CN 105582808A
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- spray ammonia
- flue
- pipeline
- ammonia
- denitrification apparatus
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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
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
-
- 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
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses an SCR denitration device and method. The SCR denitration device comprises a flue and at least one ammonia spraying pipeline layer, wherein the flue is provided with a gas inlet and a gas outlet, and flue gas flows to the gas outlet from the gas inlet; each ammonia spraying pipeline layer comprises multiple ammonia spraying pipelines, a gap is formed between every two adjacent ammonia spraying pipelines, the width of each gap is decreased and then increased in the circulation direction of the flue gas, and multiple ammonia spraying pores are formed in the side wall, facing the gap, of each ammonia spraying pipeline; the ammonia spraying pipeline layers penetrate through the flue, and the flue gas in the flue penetrates through the ammonia spraying pipeline layers through the gaps. The SCR denitration method is concise in step, the SCR denitration device is simple in structure, the flue gas and ammonia gas mixing effect can be optimized without additionally arranging a Venturi tube, the mixing distance is shortened, operation pressure drop is reduced, energy is further saved, and the flue gas treatment cost is reduced.
Description
Technical field
The present invention relates to the technical field of smoke eliminator structure and method, espespecially a kind of SCR is de-Nitre device and method.
Background technology
Along with expanding economy, the use amount of the fossil fuels such as coal, oil, natural gas increases year by year,The generation of nitrogen oxide also increases thereupon, the larger pressure that Which Ecological Environment Faced worsens. SCR(SelectiveCatalyticReduction, SCR technology) is as a kind of best feasibleDenitration technology, be widely used in the tail gas of the industries such as thermoelectricity, petrochemical industry, cement, glass and iron and steel/During the denitration of flue gas is processed.
Same tail gas/the flue gas of ammonia mixing uniformity directly affect SCR denitrification apparatus denitration efficiency andThe escaping of ammonia. Tradition SCR denitrification apparatus comprises flue and ammonia-gas spraying device, and ammonia-gas spraying device generally adopts latticeThe design of grid formula, grid pipeline is evenly arranged in flue cross section, on each grid pipeline, connects multiple spraysAmmonia branched pipe, branched pipe is provided with spray-hole, thereby ammonia is ejected in tail gas/flue gas; For increasingStrong mixed effect, the downstream of grid pipeline is generally provided with static mixing blade or vortex mixer is set,But the ammonia-gas spraying device of this form make ammonia and tail gas/flue gas to mix distance longer, and arrange mixedHing straps cause pressure drop larger, and mixed effect is also desirable not to the utmost. Along with China refers to discharged nitrous oxidesTarget requires more and more higher, and the denitration efficiency of existing SCR denitrification apparatus needs further to improve.
For solving the problems of the technologies described above, the applicant is devoted to provide a kind of novel SCR denitration dressPut and method.
Summary of the invention
The object of this invention is to provide a kind of SCR denitrification apparatus and method, wherein SCR denitrification apparatusSimple in structure, be easy for installation and removal, can make flue gas realize and mixing fully with ammonia, thereby carryThe high denitration efficiency of SCR denitrification apparatus, has reduced the escaping of ammonia rate.
For solving the problems of the technologies described above, the invention provides a kind of SCR denitrification apparatus, comprising: cigaretteRoad, has air inlet and gas outlet, and flue gas flows to described gas outlet from described air inlet; At least oneSpray ammonia pipe layers, described spray ammonia pipe layers comprises multiple spray ammonia pipelines, and adjacent described spray ammonia pipelineBetween there is gap, the width in described gap first reduces rear increase along the circulating direction of described flue gas,Described spray ammonia pipeline is provided with multiple spray ammonias hole towards the sidewall in described gap; Described spray ammonia pipe layersBe located in described flue, and flue gas in described flue through described gap through described spray ammonia pipelineLayer.
Preferably, the number of described spray ammonia pipe layers is multilayer.
Preferably, in described spray ammonia pipe layers, the axis of described spray ammonia pipeline is all positioned at same planeOn.
Preferably, described spray ammonia pipe layers is vertical with described flue.
Preferably, in spray ammonia pipe layers every layer described, the spray ammonia hole on described spray ammonia pipeline is positioned atOn the first side wall of described spray ammonia pipeline, the first side wall of described spray ammonia pipeline is that described spray ammonia pipeline leans onThe sidewall of the gas outlet of nearly described flue.
Preferably, in spray ammonia pipe layers every layer described, the place, spray ammonia hole of described spray ammonia pipelineThe angle of the axis place plane of caliber and described spray ammonia pipeline is 0～30 °.
Preferably, the cross section of described spray ammonia pipeline is oval.
Preferably, the cross section of described spray ammonia pipeline is circular.
Preferably, the diameter of described spray ammonia pipeline is 25～80mm.
The invention also discloses a kind of SCR method of denitration that is applied to above-mentioned SCR denitrification apparatus, bagDraw together step:
S10: make flue gas by the described gap in the spray ammonia pipe layers in described flue;
S20: ammonia is sprayed from the described spray ammonia hole of described spray ammonia pipeline, described ammonia and instituteState flue gas mixes in described gap.
SCR denitrification apparatus of the present invention and method can realize following any one beneficial effect.
1, in SCR denitrification apparatus of the present invention, spray ammonia device for cleaning pipeline cross spray ammonia hole to spray ammonia pipeline itBetween gap in spray ammonia, flue gas is by the gap between spray ammonia pipeline and mix flue gas with ammoniaWhen process is sprayed the gap of the venturi tubulose between ammonia pipeline, its flow velocity increases gradually in the flaring part in gap,And the minimum place in gap, that flow velocity reaches is maximum (be generally accelerated to former flow velocity 3～4 times), and cigaretteEntraining air stream rapids rushes intensity to be strengthened greatly, and the gap aditus laryngis of venturi tubulose is short, and resistance is little, and the stream of flue gasSpeed reduces gradually in the tapered portion in gap, and known according to hydrodynamics, flue gas and ammonia are at venturi tubuloseGap in mixed effect better, and the mixing of flue gas and ammonia distance is shorter, operation pressure drop is lower, fromAnd further saved the energy, reduce flue gas processing cost; And SCR denitrification apparatus of the present invention is notVenturi tube need to be set in addition, but form venturi by the gap between the sidewall of spray ammonia pipelineThe gap of tubulose, thus apparatus structure simplified, further reduce the input cost of equipment;
2, SCR denitrification apparatus of the present invention is provided with individual layer spray ammonia pipe layers, in spray ammonia pipe layersThe axis of spray ammonia pipeline is all in the same plane, and spray ammonia pipe layers is vertical with flue, arranges like this,Can make the flue gas in flue vertically pass through spray ammonia pipe layers, thereby make the mixed effect of ammonia and flue gasBetter;
The spray ammonia hole of 3, spraying ammonia pipeline in SCR denitrification apparatus of the present invention is arranged on spray ammonia pipelineNear flue gas outlet and on the sidewall in the gap of venturi tubulose, and spray place, ammonia holeCaliber is 0～30 ° with the angle of the axis place plane of spray ammonia pipeline, known through hydrodynamics, cigaretteEntraining air stream flow velocity is herein large, and rapid punching is strong, and pressure is low, and the mixed effect of flue gas and ammonia is better;
4, the cross section that sprays ammonia pipeline in SCR denitrification apparatus of the present invention is for circular, and spray ammonia pipeThe radius in road is 25～80mm, and while setting like this, the mixed effect of ammonia and flue gas is better;
5, SCR method of denitration operating procedure of the present invention is simple, the mixed effect of flue gas and ammoniaGood, effectively promote SCR denitration efficiency, reduce denitration cost.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Fig. 1 is the top view of a kind of specific embodiment of SCR denitrification apparatus of the present invention;
Fig. 2 is the cutaway view of the SCR denitrification apparatus shown in Fig. 1 in A-A direction;
Fig. 3 is the structure structure for amplifying schematic diagram at the B place shown in Fig. 2.
Drawing reference numeral explanation:
Flue 10; Spray ammonia pipeline 20, spray ammonia hole 21; Gap 30; Included angle B.
Detailed description of the invention
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below by rightIn embodiment or description of the Prior Art, the accompanying drawing of required use is briefly described, apparently,Accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain the attached of other according to these accompanying drawingsFigure.
It is below the specific embodiment of SCR denitrification apparatus of the present invention.
Embodiment mono-
Embodiment discloses a kind of SCR denitrification apparatus, comprising: flue, has air inlet and give vent to angerMouthful, flue gas flows to gas outlet from air inlet, and flue gas flow rate is generally 10～18m/s; At least one sprays ammoniaPipe layers, spray ammonia pipe layers comprises multiple spray ammonia pipelines, and has gap between adjacent spray ammonia pipeline,The width in gap first reduces rear increase along the circulating direction of flue gas, and spray ammonia pipeline is towards the sidewall in gapBe provided with multiple spray ammonias hole; Spray ammonia pipe layers is located in flue, and flue gas in flue is through gapThrough spray ammonia pipe layers.
In SCR denitrification apparatus of the present invention, spray ammonia device for cleaning pipeline and cross spray ammonia hole to spraying between ammonia pipelineIn gap, spray ammonia, flue gas is by the gap between spray ammonia pipeline and mix flue gas process with ammoniaWhile spraying the gap of the venturi tubulose between ammonia pipeline, its flow velocity increases gradually in the flaring part in gapGreatly, and locate in gap minimum, flow velocity reaches maximum (being generally accelerated to 3～4 times), thereby makesFlue gas stream rapids rushes intensity to be strengthened greatly, and in addition, the aditus laryngis in the gap of venturi tubulose is short, and resistance is little,And the flow velocity of flue gas reduces gradually in the tapered portion in gap.
Known according to hydrodynamics, mixed effect is in the gap of venturi tubulose for flue gas and ammoniaGood, and the mixing Distance Shortened of flue gas and ammonia, operation pressure drop reduces, thereby has further savedThe energy, has reduced flue gas processing cost; And SCR denitrification apparatus of the present invention does not need to establish in additionPut Venturi tube, but by between the gap formation venturi tubulose between the sidewall of spray ammonia pipelineGap, thus apparatus structure simplified, further reduce the input cost of equipment
Embodiment bis-
As shown in Figure 1, Figure 2 and Figure 3, embodiment bis-is one of SCR denitrification apparatus of the present inventionComparatively preferred embodiment, comprising: flue 10, there is air inlet and gas outlet, and flue gas is from air inletFlow to gas outlet, flue gas flow rate is generally 10～18m/s; A spray ammonia pipe layers, spray ammonia pipe layers bagDraw together multiple spray ammonia pipelines 20, and there is gap 30 between adjacent spray ammonia pipeline 20, gap 30Width first reduces rear increase along the circulating direction (the namely direction of arrow shown in Fig. 2) of flue gas,Spray ammonia pipeline 20 is provided with multiple spray ammonias hole 21 towards the sidewall in gap; Spray ammonia pipe layers is located inIn flue 10, and flue gas in flue 10 through gap through spray ammonia pipe layers.
As shown in Figure 2, the number that sprays ammonia pipe layers in SCR denitrification apparatus is one deck; At every layer of spray ammoniaIn pipe layers, the axis of spray ammonia pipeline 20 is all in the same plane; And spray ammonia pipe layers and flue10 is vertical.
As shown in Figure 3, in every layer of spray ammonia pipe layers, 21, the spray ammonia hole on spray ammonia pipeline 20On the first side wall of spray ammonia pipeline 21, the first side wall of spray ammonia pipeline 20 is for spray ammonia pipeline is near cigaretteThe sidewall of the gas outlet in road, the spray ammonia pipeline 20 shown in Fig. 3 is positioned at the sidewall of first quartile.And, in every layer of spray ammonia pipe layers, caliber and the spray at 21 places, spray ammonia hole of spray ammonia pipeline 20The included angle B of the axis place plane of ammonia pipeline 20 is 30 °.
Concrete, the cross section of spray ammonia pipeline 20 is circular, and its diameter is 45mm.
Certainly, in other embodiments, in SCR denitrification apparatus of the present invention, spray the number of ammonia pipe layersOrder can also be made as multilayer; Spray ammonia pipe layers can also be slightly obliquely or tilt be arranged on flueIn; The cross section of spray ammonia pipeline can also be made as ellipse; The diameter optimal selection scope of spray ammonia pipelineBe 25～80mm, such as 25mm, 30mm, 35mm, 50mm or 80mm etc., certainly alsoCan be made as other sizes; The caliber at the place, spray ammonia hole of spray ammonia pipeline and the axis institute of spray ammonia pipelineBe 0～30 ° in the angle optimal selection of plane, for example 0 °, 10 °, 15 °, 20 ° or 25 ° etc.,Can certainly be made as 40 °, 45 °, 50 ° or 55 ° etc.; In addition spray ammonia pipeline of the present invention,Size and the quantity of the spray ammonia pipeline in layer all can be adjusted according to the needs of Practical Project, hereinRepeat no more.
It is below the specific embodiment of SCR method of denitration of the present invention.
Embodiment mono-
The invention also discloses a kind of SCR method of denitration that is applied to above-mentioned SCR denitrification apparatus, bagDraw together step:
S10: make flue gas pass through the gap in the spray ammonia pipe layers in flue;
S20: ammonia is sprayed from the spray ammonia hole of spray ammonia pipeline, and ammonia and flue gas are mixed in gapClose.
Exemplary, as shown in Figure 2, the embodiment's bis-of SCR denitrification apparatus of the present invention is concreteApplicable cases is as follows:
One deck is sprayed to ammonia pipe layers and is arranged in flue 10, spray ammonia pipeline in spray ammonia pipe layers 20 itBetween be formed with the gap 30 of venturi tubulose, flue gas stream is vertically by spray ammonia pipe layers, and flue gasFlow velocity first increases and then decreases in the gap 30 of venturi tubulose, spray ammonia pipeline 20 by spray simultaneouslyIn 21Xiang gap, ammonia hole 30, spray ammonia, wherein spray the converging transition of ammonia hole 21 towards gap 30Part, according to hydrodynamics, the flow velocity of flue gas stream is large herein, rapid punching is strong, pressure is low, flue gas withThe good mixing effect of ammonia.
SCR denitrification apparatus of the present invention is simple in structure, by spraying the skilful of ammonia pipeline and spray ammonia holeWonderful setting, makes ammonia and flue gas can realize good mixed effect, has reduced ammonia and flue gas simultaneouslyMixing distance, further reduced operation pressure drop, thereby realized better SCR denitration effect,And reduce processing cost.
The above is only the preferred embodiment of the present invention, it should be pointed out that for the artThose of ordinary skill, under the premise without departing from the principles of the invention, can also make some improvementAnd retouching, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a SCR denitrification apparatus, is characterized in that, comprising:
Flue, has air inlet and gas outlet, and flue gas flows to described gas outlet from described air inlet;
At least one spray ammonia pipe layers, described spray ammonia pipe layers comprises multiple spray ammonia pipelines, and adjacent instituteState between spray ammonia pipeline and have gap, the width in described gap is first along the circulating direction of described flue gasReduce rear increase, described spray ammonia pipeline is provided with multiple spray ammonias hole towards the sidewall in described gap;
Described spray ammonia pipe layers is located in described flue, and flue gas in described flue is worn through described gapCross described spray ammonia pipe layers.
2. SCR denitrification apparatus as claimed in claim 1, is characterized in that:
The number of described spray ammonia pipe layers is multilayer.
3. SCR denitrification apparatus as claimed in claim 1, is characterized in that:
In spray ammonia pipe layers every layer described, the axis of described spray ammonia pipeline is all in the same plane.
4. SCR denitrification apparatus as claimed in claim 3, is characterized in that:
Described spray ammonia pipe layers is vertical with described flue.
5. SCR denitrification apparatus as claimed in claim 3, is characterized in that:
In spray ammonia pipe layers every layer described, the spray ammonia hole on described spray ammonia pipeline is positioned at described spray ammonia pipeOn the first side wall in road, the first side wall of described spray ammonia pipeline is that described spray ammonia pipeline is near described cigaretteThe sidewall of the gas outlet in road.
6. SCR denitrification apparatus as claimed in claim 5, is characterized in that:
In spray ammonia pipe layers every layer described, the caliber at the place, spray ammonia hole of described spray ammonia pipeline with described inThe angle of the axis place plane of spray ammonia pipeline is 0～30 °.
7. the SCR denitrification apparatus as described in claim 1 to 6 any one, is characterized in that:
The cross section of described spray ammonia pipeline is oval.
8. the SCR denitrification apparatus as described in claim 1 to 6 any one, is characterized in that:
The cross section of described spray ammonia pipeline is circular.
9. SCR denitrification apparatus as claimed in claim 8, is characterized in that:
The diameter of described spray ammonia pipeline is 25～80mm.
10. a SCR method of denitration, is characterized in that, described SCR method of denitration is applied to claim 1To the SCR denitrification apparatus described in any one in 9, comprise step:
S10: make flue gas by the described gap in the spray ammonia pipe layers in described flue;
S20: ammonia is sprayed from the described spray ammonia hole of described spray ammonia pipeline, described ammonia and described cigaretteGas mixes in described gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610143114.0A CN105582808B (en) | 2016-03-14 | 2016-03-14 | A kind of SCR denitration device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610143114.0A CN105582808B (en) | 2016-03-14 | 2016-03-14 | A kind of SCR denitration device and method |
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| Publication Number | Publication Date |
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| CN105582808A true CN105582808A (en) | 2016-05-18 |
| CN105582808B CN105582808B (en) | 2017-11-24 |
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| CN201610143114.0A Active CN105582808B (en) | 2016-03-14 | 2016-03-14 | A kind of SCR denitration device and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112870960A (en) * | 2021-03-19 | 2021-06-01 | 中国华电科工集团有限公司 | Ammonia spraying device and flue gas denitration device |
| CN113877399A (en) * | 2021-08-16 | 2022-01-04 | 华能国际电力股份有限公司大连电厂 | Load optimization system or thermoelectric load optimization method |
| CN116036853A (en) * | 2021-10-28 | 2023-05-02 | 中国石油化工股份有限公司 | Flue gas denitration ammonia spraying mixed dust removal equipment and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0788324A (en) * | 1993-09-21 | 1995-04-04 | Furukawa Co Ltd | Waste gas treating device |
| CN201394414Y (en) * | 2009-05-09 | 2010-02-03 | 江苏中科节能环保技术有限公司 | Injection ammonia-spray mixing mechanism of SCR reaction device |
| CN201632195U (en) * | 2010-04-06 | 2010-11-17 | 东南大学 | Fume denitration device with ammonia injection grid having regulation capability |
| CN205386409U (en) * | 2016-03-14 | 2016-07-20 | 上海蓝科石化环保科技股份有限公司 | SCR (selective catalytic reduction) denitration device |
-
2016
- 2016-03-14 CN CN201610143114.0A patent/CN105582808B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0788324A (en) * | 1993-09-21 | 1995-04-04 | Furukawa Co Ltd | Waste gas treating device |
| CN201394414Y (en) * | 2009-05-09 | 2010-02-03 | 江苏中科节能环保技术有限公司 | Injection ammonia-spray mixing mechanism of SCR reaction device |
| CN201632195U (en) * | 2010-04-06 | 2010-11-17 | 东南大学 | Fume denitration device with ammonia injection grid having regulation capability |
| CN205386409U (en) * | 2016-03-14 | 2016-07-20 | 上海蓝科石化环保科技股份有限公司 | SCR (selective catalytic reduction) denitration device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112870960A (en) * | 2021-03-19 | 2021-06-01 | 中国华电科工集团有限公司 | Ammonia spraying device and flue gas denitration device |
| CN113877399A (en) * | 2021-08-16 | 2022-01-04 | 华能国际电力股份有限公司大连电厂 | Load optimization system or thermoelectric load optimization method |
| CN113877399B (en) * | 2021-08-16 | 2024-06-11 | 华能国际电力股份有限公司大连电厂 | Denitration device |
| CN116036853A (en) * | 2021-10-28 | 2023-05-02 | 中国石油化工股份有限公司 | Flue gas denitration ammonia spraying mixed dust removal equipment and system |
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| Publication number | Publication date |
|---|---|
| CN105582808B (en) | 2017-11-24 |
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