CN106166444A - A kind of classification spray ammonia equipment for denitrifying flue gas and method - Google Patents
A kind of classification spray ammonia equipment for denitrifying flue gas and method Download PDFInfo
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- CN106166444A CN106166444A CN201610757743.2A CN201610757743A CN106166444A CN 106166444 A CN106166444 A CN 106166444A CN 201610757743 A CN201610757743 A CN 201610757743A CN 106166444 A CN106166444 A CN 106166444A
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Classifications
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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
-
- 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
- B01D53/8631—Processes characterised by a specific device
-
- 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
- B01D53/869—Multiple step processes
-
- 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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (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)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The present invention proposes a kind of classification spray ammonia equipment for denitrifying flue gas and method, including first order ammonia-spraying grid, first order catalyst layer, first order blender, second level blender, second level ammonia-spraying grid, commutator, the second level the first catalyst layer, the second level the second catalyst layer, second level preparing catalyst layer, first order control valve, second level control valve and reducing agent flow-control main valve, described device is connected with boiler back end ductwork, the out of stock device of two-stage is set, high denitration efficiency and low amount of ammonia slip can be reached under existing technical conditions.
Description
Technical field
The present invention relates to group of motors smoke pollution processing system, particularly a kind of classification spray ammonia equipment for denitrifying flue gas and side
Method.
Background technology
Along with country's raising to coal fired power plant atmosphere pollution NOx control standard, active service unit has carried out denitration mostly
Transformation, in numerous denitration means, SCR (Selective Catalytic Reduction, SCR) flue gas takes off
Nitre technology is because its denitration efficiency is high, technology maturation becomes the one preferred technique that Large-scale fire-electricity unit denitration is transformed.SCR denitration mechanism
Be converted under the catalytic action of catalyst after mixing with reducing agent (NH3) for: nitrogen oxides (NOx) non-harmful nitrogen and
Water.Generally the denitration efficiency of SCR is between 85%～95%, and promoting further of SCR denitration efficiency is lived by catalyst self
Property and ammonia nitrogen are than the impact of distributing homogeneity.
In the case of the conditions such as the activity of SCR catalyst self and status of equipment are certain, in reactor, ammonia nitrogen ratio is equal
Even degree is the most crucial on the impact of denitration efficiency.Correlational study shows: denitration efficiency is the highest, and the uniformity coefficient of ammonia nitrogen ratio is to it
Affect the biggest.Obtain the denitration efficiency of 70%～80%, when reactor outlet keeps the escaping of ammonia to be 3ppm, ammonia nitrogen ratio relative
Deviation factor need to control about 10%；When obtaining the denitration efficiency of 80%～90%, keeping outlet the escaping of ammonia is the bar of 3ppm
Under part, the relative deviation coefficient of ammonia nitrogen ratio need to control about 5%；When the denitration efficiency of acquisition more than 95%, keep simultaneously
When mouth the escaping of ammonia is 3ppm, it is necessary within the relative deviation coefficient of first floor catalyst inlet is reduced to 2%.Engineering is relatively held
Easily realize the deviation of 4%～about 10% to control, and the ammonia nitrogen within 4% to realize difficulty than deviation engineering bigger.
Summary of the invention
It is an object of the invention to arrange one layer of spray ammonia system in economizer exit, the spray ammonia system after cooperation forms classification
Spray ammonia, stage by stage by NOx removal, it is possible to while realizing NO_x Reduction by Effective, meet the requirement of the escaping of ammonia.
In order to solve the problems referred to above, the present invention proposes a kind of classification spray ammonia equipment for denitrifying flue gas and method.
The technical solution adopted in the present invention is:
A kind of classification spray ammonia equipment for denitrifying flue gas, connects with boiler back end ductwork, including:
First order denitrification apparatus, described first order denitrification apparatus is connected with boiler tail, including first order catalyst layer and
First order ammonia-spraying grid, after first order catalyst layer is arranged at first order ammonia-spraying grid；
Second level denitrification apparatus, after described second level denitrification apparatus is arranged at first order denitrification apparatus, takes off with the first order
Nitre device connects, and including second level catalyst layer and second level ammonia-spraying grid, second level catalyst layer is arranged at second level spray ammonia
After grid；
Reducing agent flow control valve, described reducing agent flow control valve is arranged at total pipeline, and total pipeline is connected with subtube,
Subtube is connected with first order ammonia-spraying grid and second level ammonia-spraying grid.
Further, also include that second level control valve, second level control valve are arranged on the ammonia-spraying grid pipeline of the second level, use
In controlling to enter the relative deviation coefficient of the ammonia nitrogen ratio of the flue gas of second level catalyst layer, it is ensured that the denitration effect of 80%～90%
Rate.
Further, also include that first order control valve, first order control valve are arranged on first order ammonia-spraying grid pipeline, use
In controlling to enter the relative deviation coefficient of the ammonia nitrogen ratio of the flue gas of second level catalyst layer, it is ensured that the denitration effect of 60%～80%
Rate.
Further, described first order ammonia-spraying grid is linear control type, and second level ammonia-spraying grid is partition type.
Further, described second level catalyst layer includes 2 to 3 layers of catalyst layer, can be well by second layer catalyst
The relative deviation of entrance ammonia nitrogen ratio is reduced to about 5%, and then significantly weakens second layer catalyst inlet ammonia nitrogen than distribution not
All impacts on denitration reaction.
Further, also include that first order blender and second level blender, described first order blender are arranged at first
Between level denitrification apparatus and second level ammonia-spraying grid, second level blender is arranged at second level ammonia-spraying grid and second level catalyst
Between Ceng, effectively alleviate the ammonia nitrogen of flue gas than skewness, eliminate its restriction to improving denitration efficiency.
Further, also include commutator, described commutator be arranged at second level blender and second level catalyst layer it
Between, effectively alleviate the ammonia nitrogen of flue gas than skewness, eliminate its restriction to improving denitration efficiency.
A kind of classification spray ammonia denitration method for flue gas, it is characterised in that based on the arbitrary described classification spray of claim 1 to 7
Ammonia equipment for denitrifying flue gas, comprises the following steps:
Step 1, after flue gas mixes with ammonia, enters first order catalyst layer and carries out denitration reaction.
Step 2, the flue gas after denitration, mix with ammonia.
Step 3, mixed flue gas remixes with ammonia, carries out denitration reaction subsequently into second level catalyst layer.
Further, the relative deviation coefficient of the ammonia nitrogen ratio of described step 1 controls at 5%-10%, the mean flow rate of flue gas
For 4m/s-6m/s, it is ensured that obtain the denitration efficiency of 70%～80% and keep the escaping of ammonia to be 3ppm in outlet.
Further, the relative deviation coefficient of the ammonia nitrogen ratio of described step 3 controls at 4%-5%, it is ensured that obtain 98%
During denitration efficiency and keep outlet the escaping of ammonia be 2ppm.
The present invention compared with the existing technology has the following advantages and effect:
1, the present invention is by arranging classification gametic fertility device, and the relative deviation coefficient at ammonia nitrogen ratio need to control at 4%-
Under conditions of 10%, the denitration efficiency of up to 98% can be realized, and the escaping of ammonia can control within 2ppm.
2, the present invention is by arranging classification gametic fertility device, and the relative deviation coefficient for ammonia nitrogen ratio need to control at 4%-
The condition of 10% easily realizes under conditions of existing engineering.
3, the present invention uses 2 layers of catalyst denitration, can be well by the relative deviation of second layer catalyst inlet ammonia nitrogen ratio
It is reduced to about 5%, and then significantly weakens second layer catalyst inlet ammonia nitrogen than the skewness impact on denitration reaction.
4, the present invention is by arranging classification gametic fertility device and blender and commutator, effectively alleviates ammonia nitrogen ratio
The skewness restriction to improving denitration efficiency.
Accompanying drawing explanation
The accompanying drawing of the part constituting the application is used for providing a further understanding of the present invention, and the present invention's is schematic real
Execute example and illustrate for explaining the present invention, being not intended that inappropriate limitation of the present invention.
Fig. 1 is the structural representation of the present invention.
Label declaration:
Burner hearth 1；Economizer 2；First order ammonia-spraying grid 3；First order catalyst layer 4；
First order blender 5；SCR upper corner flue 6；Second level blender 7；
Second level ammonia-spraying grid 8；Commutator 9；The second level the first catalyst layer 10；
The second level the second catalyst layer 11；Second level preparing catalyst layer 12；
Corner deflector 13 under SCR；First order control valve 14；Second level control valve 15；
Reducing agent flow-control main valve 16.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, not
For limiting the present invention.
Embodiment 1: as it is shown in figure 1, a kind of classification spray ammonia equipment for denitrifying flue gas, connect with boiler back end ductwork, including: stove
Thorax 1；It is positioned at the economizer 2 of burner hearth 1 afterbody；First order ammonia-spraying grid 3, first order catalyst layer 4 and first order blender 5 are all pacified
Being contained in economizer 2 and export interior, first order catalyst layer 4 is positioned over below first order ammonia-spraying grid 3, and first order blender 5 is placed in
After first order catalyst layer 4, it is positioned at economizer 2 exit, and first order ammonia-spraying grid 3 is linear control type；The most successively
Corner flue 6 on corner deflector 13, second level ammonia-spraying grid 8, second level blender 7 and SCR under connection SCR, the second level is mixed
Clutch 7 is positioned at the spout rear of second level ammonia-spraying grid 8, and second level ammonia-spraying grid 8 is partition type；It is finally commutator 9, second
Level the first catalyst layer 10, the second level the second catalyst layer 11 and second level preparing catalyst layer 12, commutator 9, the second level the
One catalyst layer 10, the second level the second catalyst layer 11 and second level preparing catalyst layer 12 are arranged in parallel；The first order is sprayed
Ammonia grid 3 and second level ammonia-spraying grid 8, arrange first order control valve 14, second level control valve 15, reducing agent flow-control main valve
16 control to spray ammonia flow, and reducing agent flow-control main valve 16 is arranged on total pipeline, first order control valve 14, and the second level controls
Valve 15 is separately mounted on lateral.
During fume emission, the flue gas flow rate entering first order denitrification apparatus is controlled at 4m/s-6m/s, then uses the first order
Control valve 14 arranges the spray ammonia flow of first order ammonia-spraying grid 3, it is ensured that the ammonia nitrogen ratio of the flue gas after first order ammonia-spraying grid 3
Relative deviation coefficient control at 5%-10%, mixed flue gas is through first order catalyst layer 4, it is achieved pre-denitration, it is thus achieved that
The denitration efficiency of 70%～80% and keep the escaping of ammonia to be the flue gas of 3ppm in outlet, then passes through first order blender 5, with little
After part ammonia mix homogeneously, the guiding of corner deflector 13 under SCR, through second level ammonia-spraying grid 8, use second level control
Valve 15 controls spray ammonia flow, it is ensured that the relative deviation coefficient of the ammonia nitrogen ratio of the flue gas after second level ammonia-spraying grid 8 controls
5%, after commutator current stabilization, finally enter the second level the first catalyst layer 10 and the second level the second catalyst layer 11, complete secondary
Denitration, it is thus achieved that the denitration efficiency of 98%, and the escaping of ammonia can control the tail gas within 2ppm.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (10)
1. a classification spray ammonia equipment for denitrifying flue gas, it is characterised in that connect with boiler back end ductwork, including:
First order denitrification apparatus, described first order denitrification apparatus is connected with boiler tail, including first order catalyst layer and first
Level ammonia-spraying grid, after first order catalyst layer is arranged at first order ammonia-spraying grid；
Second level denitrification apparatus, after described second level denitrification apparatus is arranged at first order denitrification apparatus, fills with first order denitration
Putting connection, including second level catalyst layer and second level ammonia-spraying grid, second level catalyst layer is arranged at second level ammonia-spraying grid
Afterwards；
Reducing agent flow control valve, described reducing agent flow control valve is arranged at total pipeline, and total pipeline is connected with subtube, is in charge of
Road is connected with first order ammonia-spraying grid and second level ammonia-spraying grid.
Classification the most according to claim 1 spray ammonia equipment for denitrifying flue gas, it is characterised in that also include second level control valve,
Second level control valve is arranged on the ammonia-spraying grid pipeline of the second level.
Classification the most according to claim 2 spray ammonia equipment for denitrifying flue gas, it is characterised in that also include first order control valve,
First order control valve is arranged on first order ammonia-spraying grid pipeline.
Classification the most according to claim 3 spray ammonia equipment for denitrifying flue gas, it is characterised in that described first order ammonia-spraying grid is
Linear control type, second level ammonia-spraying grid is partition type.
Classification the most according to claim 1 spray ammonia equipment for denitrifying flue gas, it is characterised in that described second level catalyst layer bag
Include 2 to 3 layers of catalyst layer.
Classification the most according to claim 1 spray ammonia equipment for denitrifying flue gas, it is characterised in that also include first order blender and
Second level blender, described first order blender is arranged between first order denitrification apparatus and second level ammonia-spraying grid, the second level
Blender is arranged between second level ammonia-spraying grid and second level catalyst layer.
Classification the most according to claim 6 spray ammonia equipment for denitrifying flue gas, it is characterised in that also include commutator, described whole
Stream device is arranged between second level blender and second level catalyst layer.
8. a classification spray ammonia denitration method for flue gas, it is characterised in that based on the arbitrary described classification spray ammonia of claim 1 to 7
Equipment for denitrifying flue gas, comprises the following steps:
Step 1, after flue gas mixes with ammonia, enters first order catalyst layer and carries out denitration reaction.
Step 2, the flue gas after denitration, mix with ammonia.
Step 3, mixed flue gas remixes with ammonia, carries out denitration reaction subsequently into second level catalyst layer.
Classification the most according to claim 8 spray ammonia denitration method for flue gas, it is characterised in that the ammonia nitrogen ratio of described step 1
Relative deviation coefficient controls at 5%-10%, and the mean flow rate of flue gas is 4m/s-6m/s.
Classification the most according to claim 8 spray ammonia denitration method for flue gas, it is characterised in that the ammonia nitrogen ratio of described step 3
Relative deviation coefficient controls at 4%-5%.
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| CN201610757743.2A CN106166444A (en) | 2016-08-29 | 2016-08-29 | A kind of classification spray ammonia equipment for denitrifying flue gas and method |
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| CN201610757743.2A CN106166444A (en) | 2016-08-29 | 2016-08-29 | A kind of classification spray ammonia equipment for denitrifying flue gas and method |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106540544A (en) * | 2017-01-20 | 2017-03-29 | 国网河南省电力公司电力科学研究院 | A kind of denitrating flue gas response system |
| CN106582285A (en) * | 2016-12-29 | 2017-04-26 | 华电电力科学研究院 | Multi-stage ammonia spraying efficient SCR flue gas denitrification system |
| CN106706836A (en) * | 2017-01-18 | 2017-05-24 | 华电电力科学研究院 | Online detection device and detection method of catalyst activity of SCR (selective catalytic reduction) denitrification system |
| CN106731812A (en) * | 2017-01-17 | 2017-05-31 | 国网河南省电力公司电力科学研究院 | A kind of flue gas subregion mixing denitrating system |
| CN106731804A (en) * | 2016-12-28 | 2017-05-31 | 华电电力科学研究院 | A kind of π type boiler SCR equipment for denitrifying flue gas based on stepped mixing |
| CN107008144A (en) * | 2017-05-23 | 2017-08-04 | 国电科学技术研究院 | A kind of device and denitration method for flue gas for realizing SCR denitrating flue gas multistage spray ammonia |
| CN107694305A (en) * | 2017-09-19 | 2018-02-16 | 华电电力科学研究院 | A kind of SCR denitration system and its method of work of two-stage reactor series connection |
| CN109647193A (en) * | 2018-12-28 | 2019-04-19 | 浙江天蓝环保技术股份有限公司 | A kind of SCR denitration method and device of ammonia segmentation supply |
| CN110394050A (en) * | 2019-07-02 | 2019-11-01 | 华电电力科学研究院有限公司 | A kind of two-stage spray ammonia combined denitration system and method for denitration |
| CN110585921A (en) * | 2019-07-25 | 2019-12-20 | 大唐东北电力试验研究院有限公司 | Double-ammonia-injection grid selective catalytic reduction denitration device and ammonia injection optimization method thereof |
| CN112823237A (en) * | 2018-10-09 | 2021-05-18 | 日本发动机股份有限公司 | SCR system for ship |
| CN113578042A (en) * | 2021-08-04 | 2021-11-02 | 河南工业职业技术学院 | Multistage ammonia-spraying efficient SCR flue gas denitration system |
| CN115532057A (en) * | 2022-10-31 | 2022-12-30 | 连云港虹洋热电有限公司 | Purification and denitration device and method for flue gas of thermal power plant |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106731804A (en) * | 2016-12-28 | 2017-05-31 | 华电电力科学研究院 | A kind of π type boiler SCR equipment for denitrifying flue gas based on stepped mixing |
| CN106582285A (en) * | 2016-12-29 | 2017-04-26 | 华电电力科学研究院 | Multi-stage ammonia spraying efficient SCR flue gas denitrification system |
| CN106731812A (en) * | 2017-01-17 | 2017-05-31 | 国网河南省电力公司电力科学研究院 | A kind of flue gas subregion mixing denitrating system |
| CN106706836A (en) * | 2017-01-18 | 2017-05-24 | 华电电力科学研究院 | Online detection device and detection method of catalyst activity of SCR (selective catalytic reduction) denitrification system |
| CN106540544A (en) * | 2017-01-20 | 2017-03-29 | 国网河南省电力公司电力科学研究院 | A kind of denitrating flue gas response system |
| CN107008144A (en) * | 2017-05-23 | 2017-08-04 | 国电科学技术研究院 | A kind of device and denitration method for flue gas for realizing SCR denitrating flue gas multistage spray ammonia |
| CN107008144B (en) * | 2017-05-23 | 2023-05-26 | 国家能源集团科学技术研究院有限公司 | Device for realizing SCR flue gas denitration multistage ammonia spraying and flue gas denitration method |
| CN107694305A (en) * | 2017-09-19 | 2018-02-16 | 华电电力科学研究院 | A kind of SCR denitration system and its method of work of two-stage reactor series connection |
| CN112823237B (en) * | 2018-10-09 | 2023-02-28 | 日本发动机股份有限公司 | SCR system for ship |
| CN112823237A (en) * | 2018-10-09 | 2021-05-18 | 日本发动机股份有限公司 | SCR system for ship |
| CN109647193A (en) * | 2018-12-28 | 2019-04-19 | 浙江天蓝环保技术股份有限公司 | A kind of SCR denitration method and device of ammonia segmentation supply |
| CN110394050A (en) * | 2019-07-02 | 2019-11-01 | 华电电力科学研究院有限公司 | A kind of two-stage spray ammonia combined denitration system and method for denitration |
| CN110585921B (en) * | 2019-07-25 | 2021-11-26 | 大唐东北电力试验研究院有限公司 | Double-ammonia-injection grid selective catalytic reduction denitration device and ammonia injection optimization method thereof |
| CN110585921A (en) * | 2019-07-25 | 2019-12-20 | 大唐东北电力试验研究院有限公司 | Double-ammonia-injection grid selective catalytic reduction denitration device and ammonia injection optimization method thereof |
| CN113578042A (en) * | 2021-08-04 | 2021-11-02 | 河南工业职业技术学院 | Multistage ammonia-spraying efficient SCR flue gas denitration system |
| CN115532057A (en) * | 2022-10-31 | 2022-12-30 | 连云港虹洋热电有限公司 | Purification and denitration device and method for flue gas of thermal power plant |
| CN115532057B (en) * | 2022-10-31 | 2023-10-27 | 连云港虹洋热电有限公司 | Purifying and denitrating device and method for flue gas of thermal power plant |
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Application publication date: 20161130 |