CN105498530B - The method that search gas instructs spray ammonia adjustment is introduced in SCR system simulation - Google Patents
The method that search gas instructs spray ammonia adjustment is introduced in SCR system simulation Download PDFInfo
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- CN105498530B CN105498530B CN201510896864.0A CN201510896864A CN105498530B CN 105498530 B CN105498530 B CN 105498530B CN 201510896864 A CN201510896864 A CN 201510896864A CN 105498530 B CN105498530 B CN 105498530B
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 134
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 64
- 239000007921 spray Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004088 simulation Methods 0.000 title claims abstract description 17
- 238000009826 distribution Methods 0.000 claims abstract description 15
- 239000003054 catalyst Substances 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000012546 transfer Methods 0.000 claims abstract description 3
- 238000005507 spraying Methods 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 6
- 206010022000 influenza Diseases 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 26
- 238000002474 experimental method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000000700 radioactive tracer Substances 0.000 description 2
- WWILHZQYNPQALT-UHFFFAOYSA-N 2-methyl-2-morpholin-4-ylpropanal Chemical compound O=CC(C)(C)N1CCOCC1 WWILHZQYNPQALT-UHFFFAOYSA-N 0.000 description 1
- 201000004569 Blindness Diseases 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- IXSZQYVWNJNRAL-UHFFFAOYSA-N etoxazole Chemical compound CCOC1=CC(C(C)(C)C)=CC=C1C1N=C(C=2C(=CC=CC=2F)F)OC1 IXSZQYVWNJNRAL-UHFFFAOYSA-N 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The method that spray ammonia is optimized and revised is instructed based on introducing search gas in being simulated in SCR system the invention discloses a kind of.By carrying out full size modeling and mesh generation to SCR system, original composition is replaced using equivalent search gas to part spray ammonia branch pipe, turbulent flow, multicomponent diffusivities, heat transfer and catalyst layer chemical reaction in numerical simulation SCR system, by exporting the concentration distribution of each search gas on outlet, the ammonia of each spray ammonia branch pipe ejection can be obtained in influence area corresponding to outlet.In field optimizing adjustment, it is higher or relatively low to export certain region NOx concentration, you can the adjustment of ammonia branch pipe valve opening is sprayed corresponding to the region obtained by Adjust and use this method, finally outlet NOx concentration is evenly distributed.Proved through field test, this method is effectively reliable, has higher practical value.The defects of avoiding the corresponding relation that exit region concentration and each spray ammonia branch pipe can not be found out in field test.
Description
Technical field
The invention belongs to thermal power plant's energy environment protection technical field, and in particular to a kind of to introduce tracer in SCR system simulation
Gas instructs to spray the method for ammonia adjustment, is related specifically to be based on to introduce search gas guidance spray ammonia optimization in SCR system simulation
The method of adjustment, optimize and revise fast and effectively to adjust in experiment available for spray ammonia and ammonia branch pipe valve opening is respectively sprayed in SCR system
So that outlet measuring point section NOxUniform concentration distribution.
Background technology
According to [2011] No. 51 texts of general office of national environmental protection portion letter《Fossil-fuel power plant atmospheric pollutant emission standard》, 2012
Newly-built thermal power generation boiler unit NOx emission concentration is not more than 100mg/Nm3 from January 1, in, existing from 1 day July in 2014
Unit NOx emission concentration is not more than 100mg/Nm3.SCR system turns into the essential part of thermal power generation unit.
Denitrating flue gas SCR device would generally carry out flow field simulation and physical experiments in the design phase to the stream in flue
Field optimizes, to ensure that the flue gas flow rate of SCR outlets and NOx distributions are more uniform.But due to site space limitation or
The factors such as installation, attention is optimized and revised not enough to ammonia-spraying grid plus the debugging stage, occurs SCR outlets in actual moving process
Section NOx distribution bias is big, and subregion the escaping of ammonia exceedes the phenomenon of design certified value.This can influence the overall denitration effect of system
Fruit, and the ammonium hydrogen sulfate corrosion of air preheater can be increased and block risk, the economic stability operation to system brings very big harm.
Optimized and revised therefore, it is quite necessary to carry out spray ammonia to SCR device, i.e., by adjusting the hand on every spray ammonia branch pipe of SCR inlet
It is dynamic to adjust valve, change the ammonia spraying amount of diverse location, so as to improve the uniformity of outlet NOx and NH3 distributions, ensure device denitration effect
While fruit, the operating cost of device is reduced, improves the availability of device.
It is to utilize to measure each branch pipe valve opening of exit NOx concentration field feedback adjustment in actual SCR system adjusts ammonia, but
Because actual SCR structure of reactor is complicated, it is difficult to find an exit certain regional concentration with adjusting certain spray ammonia from mode corresponding to geometry
The one-to-one relation of branch pipe, so blindness is very big during actual adjustment.If it is numerous to spray ammonia branch pipe, ammonia branch pipe valve is sprayed
Aperture number of combinations is huge, if spraying the adjustment of ammonia branch pipe valve opening without rational theoretical direction, relies solely on experience and realizes outlet
Time-consuming for the uniform task of concentration field, and efficiency is low, and cost sharply increases, and difficulty is big.Because live physical condition is limited, and it is unable to shadow
The normal operation of unit is rung, so exit region concentration and each spray ammonia branch pipe can not be found out by doing the method for field test
Corresponding relation.
The content of the invention
It is an object of the invention to provide a kind of method that search gas is introduced in SCR system simulation and instructs spray ammonia adjustment, profit
Exit region concentration and each spray ammonia branch pipe corresponding relation fast and effective can be easily found out with this method, then passes through this correspondence
The corresponding spray ammonia branch pipe aperture of relation adjustment causes the distribution of certain regional concentration to reach desired value, can be good at instructing scene spray ammonia excellent
Change adjustment, while there is good economy.And proved through field test, this method is effectively reliable, has higher practical valency
Value.Avoid the defects of field test in the prior art can not find out the corresponding relation of exit region concentration and each branch pipe.
In order to overcome deficiency of the prior art, search gas is introduced in SCR system simulation the invention provides one kind
The solution of the method for spray ammonia adjustment is instructed, i.e., offer is a kind of is based on introducing search gas guidance spray in SCR system simulation
The method that ammonia is optimized and revised, it is specific as follows：
A kind of method that search gas is introduced in SCR system simulation and instructs spray ammonia adjustment, obtain the structure chi of SCR system
It is very little, and smoke inlet flow, temperature, each component content and pollutant concentration, spray ammonia nozzle flow, constituent content and temperature,
Full size Fluid Mechanics Computation modeling is carried out to SCR system, including to SCR flues, ammonia-spraying grid, blender, deflector, rectification
The modeling of grid and catalyst layer and grid division, each parameter of SCR system import can be calculated by offer data and obtained, ammonia-spraying grid
Nozzle sprays ammonia and air Mixture, and each parameter is understood, the nozzle of part branch pipe introduces search gas and replaces ammonia, air to mix
Gas, catalyst layer consider NH3 and NOx chemical reaction, substitute into whole system and carry out numerical computations, determine to calculate after calculating convergence
As a result export outlet measuring point section search gas distribution map, establishes coordinate after correct, and Treatment Analysis obtains the main of search gas
Distributed areas, the region is to spray into the influence area corresponding to the spray ammonia branch pipe of the search gas, if NOx concentration on the region
Higher or relatively low i.e. adjustable spray ammonia branch pipe aperture size, most the region NOx concentration is transferred to desired value at last.Every spray ammonia branch
The corresponding influence area of pipe can be obtained by the above method, i.e., spray ammonia branch pipe is understood corresponding to each region in outlet, each
Region can reach desired value by spraying ammonia branch pipe valve opening corresponding to regulation, and most the distribution of whole cross section NOx concentration is adjusted at last
Whole uniformly to correspond to branch pipe figure by establishing each region, the figure can be used easily on the spot at the scene, instruct spray ammonia to optimize and revise
Experiment.
According to above-mentioned technical proposal, the modeling of described full size is included to flue, ammonia-spraying grid, blender, deflector, whole
Flow grid and catalyst layer carries out completely modeling and mesh generation.
According to above-mentioned technical proposal, described numerical simulation considers the turbulent flow of fluid in SCR system, multicomponent expands
Scattered, heat transfer and the chemical reaction of catalyst layer, can really reflect situation in SCR system.
According to above-mentioned technical proposal, described introduces the tracer that search gas replaces ammonia, air Mixture is the flows such as use
Gas is replaced, and the temperature of the search gas, density, diffusion coefficient are close with original gas.
According to above-mentioned technical proposal, described part branch pipe introduces search gas and introduced respectively once to calculate more branch pipes
Different search gas, outlet difference search gas distributed areas can be exported after the completion of calculating, i.e., once calculate can obtain it is more
The influence area of root branch pipe, efficiency improve.
Brief description of the drawings
Fig. 1 instructs the method schematic diagram that spray ammonia is optimized and revised to be a kind of based on introducing search gas in being simulated in SCR system,
Wherein：1st, SCR flues；2nd, ammonia-spraying grid；3rd, search gas；4th, blender；5th, deflector；6th, flow straightening grid；7th, catalyst layer；
8th, measuring point section is exported；
Fig. 2 is each branch pipe layout drawing of ×× power plant ammonia-spraying grid in embodiment, and R1-R12 is the numbering of 1/4 branch pipe.
Fig. 3 is that the gas for each spray ammonia branch pipe ejection for carrying out numerical simulation acquisition in embodiment to ×× power plant is surveyed in outlet
The influence area distribution in point section.
Embodiment
The content of the invention is described further with reference to the accompanying drawings and examples：
The embodiment is that ×× power plant 1000MW units SCR spray ammonia optimizes and revises experiment.The SCR system structure such as Fig. 1 institutes
Show, be included in the structure in SCR flues and set gradually ammonia-spraying grid 2, blender 4, deflector 5, flow straightening grid 6, catalysis
Oxidant layer 7, outlet measuring point section 8 are located at the lower section of catalyst layer 7, can thus obtain the structure arrangement of the SCR system, including
The size of SCR flues 1, the arrangement of ammonia-spraying grid 2, the positions and dimensions of nozzle, the arrangement and size of deflector 5, flow straightening grid 6
Size, the parameter of catalyst 7.Inlet flow rate, temperature, each component content and the pollutant concentration parameter under certain operating mode are obtained,
And spray ammonia nozzle flow, constituent content and parameter as temperature.The Fluid Mechanics Computation that full size is carried out to SCR system is built
Mould, including the modeling to SCR flues 1, ammonia-spraying grid, blender, deflector, flow straightening grid and catalyst layer, carry out grid and draw
Point.Suction parameter and spray ammonia suction parameter can be calculated by the data of above-mentioned acquisition.Due to the ammonia-spraying grid arrangement it is symmetrical
Property, region corresponding to 1/4 spray ammonia branch pipe need to be only obtained, remaining branch pipe can be obtained by symmetry.To serial number R1-R12 branch pipes
Introduce different search gas 3 and replace ammonia, air Mixture, its volume flow is still initial value.The turbulent flow of fluid in consideration system
The chemical reaction of diffusion, heat and mass and catalyst layer NH3 and NOx between dynamic, multicomponent, carries out numerical computations, calculates and determines to receive
After holding back, result of calculation and test data of knowing the real situation are compared, determine result of calculation in error range.Export outlet measuring point section 8
Each search gas distribution, establish coordinate, obtain the distributed areas of search gas, every kind of corresponding spray of search gas distribution
Ammonia branch pipe, the influence area of all branch pipes can be obtained by symmetry.Exit region corresponding diagram is drawn, is used for field adjustable.
In scene spray ammonia Optimum Experiment, each measuring point NOx concentration value in outlet 8 is measured, if some regions NOx concentration value is higher, is passed through
Corresponding diagram finds corresponding spray ammonia branch pipe, opens the big branch pipe valve opening, sprays into the increase of ammonia amount, and the region NOx concentration will
Decline, permitted to adjust through too small, the region NOx concentration is reached into desired value.The similar corresponding branch pipe valve of other regions adjustment, finally
Outlet 8NOx concentration distributions meet adjustment requirement, write down all valve openings, and the aperture is combined as the spray ammonia under the operating mode
Optimal aperture.Spray ammonia optimizes and revises end.
For baroque SCR reactors, it is difficult to find an exit section region with spraying ammonia branch pipe with conventional method
One-to-one relationship, but fast and effective corresponding relation easily can be found out using the above method, then pass through this corresponding relation
The corresponding spray ammonia branch pipe aperture of adjustment causes the distribution of certain regional concentration to reach desired value, can be good at instructing spray ammonia optimization in scene to adjust
It is whole, while there is good economy.And proved through field test, this method is effectively reliable, has higher practical value.
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, as long as be without departing from technical solution of the present invention content, according to the technical spirit of the present invention,
Within the spirit and principles in the present invention, any simple modification, equivalent substitution and improvement for being made to above example etc., still
Belong within the protection domain of technical solution of the present invention.
Claims (3)
- A kind of 1. method that virtual search gas is introduced in SCR system simulation and instructs spray ammonia adjustment, it is characterised in that to SCR System carries out full size Fluid Mechanics Computation modeling, including to SCR flues（1）, ammonia-spraying grid（2）, blender（4）, deflector （5）, flow straightening grid（6）And catalyst layer（7）Completely modeled, part sprays ammonia nozzle and introduces virtual search gas（3）Substitute into Model is calculated, and is controlled after calculating convergence compared with test data of knowing the real situation in error range, export outlet measuring point section（8） Each virtual search gas distribution map, and coordinate is established, Treatment Analysis obtains its main distributed areas, and the region virtually shows to introduce Influence area corresponding to the spray ammonia branch pipe of track gas；In field optimizing Adjustment Tests, outlet measuring point section is measured（8）Certain region NOxConcentration is higher or relatively low, you can ammonia branch pipe valve opening is sprayed corresponding to the region obtained by Adjust and use this method and is adjusted It is whole, different zones NOxConcentration by corresponding spray ammonia branch pipe control, using this method adjust corresponding to each branch pipe valve opening can will Outlet NOxConcentration distribution is tuned into uniformly.
- 2. the method according to claim 1 that virtual search gas is introduced in SCR system simulation and instructs spray ammonia adjustment, its It is characterised by：The turbulent flow of fluid in SCR system, multicomponent transmission diffusion, heat transfer and the change of catalyst layer are considered in simulation Reaction is learned, it is real to reflect actual conditions in SCR system.
- 3. the method according to claim 1 that virtual search gas is introduced in SCR system simulation and instructs spray ammonia adjustment, its It is characterised by：The virtual search gas of the flow such as use at ammonia branch pipe is being sprayed in simulation（3）Replace the ammonia originally sprayed into, air mixing Gas, and the temperature of the virtual search gas, density, diffusion coefficient and raw-gas are close.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107149875B (en) * | 2017-05-15 | 2023-04-11 | 大唐环境产业集团股份有限公司 | Non-uniform injection device and method for SCR cold-state modeling test |
| CN107349786A (en) * | 2017-07-06 | 2017-11-17 | 大唐东北电力试验研究所有限公司 | Selective catalytic reduction denitration device and its spray ammonia optimization method |
| CN109173635B (en) * | 2018-10-22 | 2024-03-26 | 中国能源建设集团华中电力试验研究院有限公司 | Reducing ammonia spraying grid pipeline system and SCR denitration device with same |
| CN110038426A (en) * | 2019-04-13 | 2019-07-23 | 程琛 | A kind of frequency modulation type is intelligent to control ammonia system and method |
| CN118743908A (en) * | 2024-09-03 | 2024-10-08 | 上海万澄环保科技有限公司 | Intelligent denitration system for cement kiln |
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Address after: 211100 Jiangsu city of Nanjing province Jiangning Tianyuan Science Park Road No. 19 Applicant after: Jiangsu Fangtian Power Technology Co., Ltd. Applicant after: Jiangsu Electric Power Company Applicant after: State Grid Corporation of China Address before: 211102 Jiangning, Jiangsu, Jiangsu Province, the source of the road No. 58 Applicant before: Jiangsu Fangtian Power Technology Co., Ltd. Applicant before: Jiangsu Electric Power Company Applicant before: State Grid Corporation of China |
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