CN107149875A - Heterogeneity injection apparatus and method for SCR cold simulation tests - Google Patents
Heterogeneity injection apparatus and method for SCR cold simulation tests Download PDFInfo
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- CN107149875A CN107149875A CN201710338619.7A CN201710338619A CN107149875A CN 107149875 A CN107149875 A CN 107149875A CN 201710338619 A CN201710338619 A CN 201710338619A CN 107149875 A CN107149875 A CN 107149875A
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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
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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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/0278—Arrangement or mounting of spray heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
- B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
-
- 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)
- 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)
- Testing Of Engines (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention provides a kind of heterogeneity injection apparatus for SCR cold simulation tests, is arranged in a flue, including：It is multigroup that there is mutually isostructural injection subelement；Each injection subelement includes：One NOx/ spike gas dilutes wind inlet tube；Connect the NOx/ spike gas dilutes a stand tube of wind inlet tube；It is arranged at multiple nozzles of the stand tube；It is arranged at the static mixing tube of the nozzle of nozzle.The device can realize NO in SCR cold simulation testsxThe non-homogeneous injection of/search gas, so that guarantee test parameter more conforms to actual operating mode, improves the precision and reliability of cold model experiment.Injection method based on said apparatus is provided simultaneously.
Description
Technical field
The present invention relates to a kind of heterogeneity injection apparatus and method for SCR cold simulation tests, specifically
One kind can realize NOxThe SCR cold simulation test device and methods of the non-homogeneous injection of/search gas.
Background technology
During 13, coal fired power plant denitration minimum discharge is transformed into China emphasis NOxGas abatement important technology is arranged
One of apply.In China, process choice selective catalytic reduction (the Selective Catalytic of power station denitration technology main flow
Reduction, SCR), selective catalytic reduction refers in the presence of catalyst, utilizes reducing agent (such as NH3, liquefied ammonia, urine
Element) come " selective " with the NO in flue gasxReact and generate the N of nontoxic pollution-free2And H2O。
SCR denitration technology to boiler smoke NOx control effects very significantly, technology it is more ripe, stably, turned at present
In the world using a kind of most, most fruitful gas denitrifying technology.Under rational arrangement and temperature range, it can reach 80~
90% removal efficiency.Therefore, SCR denitration technology is widely used in the coal fired power plant of the country.
NO during selective-catalytic-reduction denitrified SCRxThe efficiency of reduction reaction is directly decided by NO in flue gasxWith NH3's
Matching degree (reaching rational equivalent weight ratio) is mixed, i.e., ammonia cigarette mixing matching degree is high then reacts completely, otherwise denitration efficiency will be caused low
Or NH3Surplus and form the escaping of ammonia, this is all unfavorable to the even whole steam generator system of SCR denitration system.
The double technique plan that the current optimization to SCR system is substantially verified using numerical simulation with cold simulation test
Omit, and cold simulation test rests on the checking research stage of " flue gas " speed Field distribution characteristic mostly at present.In recent years, there is portion
Researcher is divided to propose to simulate flowing and diffusion of the reducing agent ammonia in " flue gas " using search gas, having achieved some relatively has
The result of study of convincingness.What deserves to be explained is, above-mentioned research only only accounts for the flowing and diffusion of reducing agent ammonia, and assumes
Nitrogen oxides (the NO of denitration entrancex) living through after a series of turning flue is sufficiently mixed it is equally distributed.But again
There is researcher to be found by means such as field measurements, the NO of SCR system entrancexConcentration and non-uniform Distribution, therefore, using above-mentioned
Research strategy has some limitations.
The content of the invention
In view of the above-mentioned problems, it is an object of the invention to provide a kind of heterogeneity spray for SCR cold simulation tests
Injection device and method, the device can realize NO in SCR cold simulation testsxThe non-homogeneous injection of/search gas, so as to ensure
Test parameters more conforms to actual operating mode, improves the precision and reliability of cold model experiment.
For up to above-mentioned purpose, the present invention is adopted the technical scheme that：
A kind of heterogeneity injection apparatus for SCR cold simulation tests, is arranged in a flue, including：
It is multigroup that there is mutually isostructural injection subelement；
Each injection subelement includes：One NOx/ spike gas dilutes wind inlet tube；Connect the NOx/ spike gas dilutes wind inlet tube
A stand tube；It is arranged at multiple nozzles of the stand tube；It is arranged at the static mixing tube of the nozzle of nozzle.
Further, the flue is the entrance horizontal flue or entrance vertical gas pass of a SCR denitration system.
Further, the stand tube is a H type pipes, including a pair of transverse tubes；Connect the longitudinal tubule (L tubule) of a pair of transverse tubes；The nozzle
It is arranged at the longitudinal tubule (L tubule)；The NOx/ spike gas dilution wind inlet tube is connected with transverse tube；The static mixing tube has two, with institute
Longitudinal tubule (L tubule) is stated to be arranged in parallel.
Further, the arrangement group number and size of each injection subelement are according to flue size, scaling, interim gaging hole number
Mesh is determined.
Further, arbitrary neighborhood center line of suction transverse and longitudinal spacing is no more than 800mm, entrance caliber d1 span
For 30mm-50mm.
Further, the suction parameter of each injection subelement is NOx/ spike gas dilution wind jet velocity v and NOxConcentration c；
Live operational factor be each discrete point position based on the actual acquisition of interim gaging hole for being arranged in flue on velocity of flue gas with
NOxConcentration；The suction parameter of each injection subelement is obtained by live operational factor, and both transformational relations meet similarity criterion.
Further, single injection subelement arrangement nozzle sum is not less than 6, and the nozzle height is between 20mm-
30mm, is flat mouth or angle form.
Further, injection direction of the static mixing tube just to nozzle, is hollow cylindrical, static mixing tube hub
The distance of plane separation jet expansion is between 100mm~400mm where line.
A kind of heterogeneity injection method for SCR cold simulation tests, comprises the following steps：
Interim gaging hole is opened up in a flue, the velocity of flue gas and NO of multiple discrete point positions is obtainedxConcentration；
Multigroup mutually isostructural injection subelement is arranged in the interim gaging hole position of correspondence in flue；
Each injection subelement sprays NO according to different suction parametersx/ search gas；
Wherein, velocity of flue gas and NO of the different suction parameter according to multiple discrete point positionsxConcentration passes through full
The conversion of sufficient similarity criterion is obtained.
By taking NO in above-mentioned technical proposal, the achievable cold simulation test of the present inventionx/ spike gas it is non-homogeneous defeated
Enter, so that guarantee test parameter more conforms to actual operating mode, help to lift the precision and reliability of cold model experiment, help
In Instructing manufacture running optimizatin.
Brief description of the drawings
Fig. 1 is the NO in one embodiment of the invention for SCR cold simulation testsxThe peace of concentration heterogeneity injection apparatus
Holding position schematic diagram.
Fig. 2 is the NO in one embodiment of the invention for SCR cold simulation testsxConcentration heterogeneity injection apparatus it is total
Body overlooking surface arranges schematic diagram.
Fig. 3 is the NO in one embodiment of the invention for SCR cold simulation testsxSprayed in concentration heterogeneity injection apparatus
Penetrate the dimensional structure diagram of subelement.
Fig. 4 is the NO in one embodiment of the invention for SCR cold simulation testsxSprayed in concentration heterogeneity injection apparatus
Penetrate the side structure schematic view of subelement.
Fig. 5 is based on the NO in one embodiment of the invention for SCR cold simulation testsxConcentration heterogeneity injection apparatus
The cold simulation test result (the NO Flux Distributions characteristic before ammonia-spraying grid in flue cross section) carried out.
Embodiment
With reference to Figure of description and specific embodiment, the invention will be further described：
For certain 660MW grades of coal unit SCR system, the present embodiment provides a kind of for the non-of SCR cold simulation tests
Uniformity injection apparatus, is arranged in a flue, as shown in figure 1, being installed on SCR system entrance horizontal flue.Its sectional dimension
For 5200mm × 8400mm.The SCR system entrance horizontal flue top is reserved with 4 interim gaging holes altogether.For SCR cold models
The NO of experimentxConcentration heterogeneity injection apparatus installation site is consistent according to the position of the interim gaging hole of SCR system entrance,
In further embodiment, the entrance vertical gas pass of the optional SCR denitration system of flue, it is vertical that interim gaging hole is also accordingly opened in entrance
Flue.
As shown in Fig. 2 device includes：It is multigroup that there is mutually isostructural injection subelement；The choosing of dotted line frame institute frame is in figure
One of injection subelement.Each overall scaling of injection subelement is consistent with cold simulation test design scaling, root
Determine that present apparatus transverse and longitudinal respectively sprays the arrangement of subelement according to interim gaging hole quantity and each gaging hole institute placement of discrete measuring point quantity
Group number, and combine flue size, it is ensured that each injection subelement can uniformly be covered with whole " flue " section.
With reference to Fig. 3 and Fig. 4, each injection subelement includes：NOx/ spike gas dilution wind inlet tube 1；Connect NOx/ spike gas is dilute
Release the stand tube 2 of wind inlet tube 1；It is arranged at multiple nozzles 3 of stand tube 2；It is arranged at the static mixing tube of the nozzle of nozzle 3
4。
Stand tube 2 is a H type pipes, including a pair of transverse tubes；Connect the longitudinal tubule (L tubule) of a pair of transverse tubes；Nozzle 3 is arranged at longitudinal tubule (L tubule)；NOx/
Spike gas dilution wind inlet tube 1 is connected with transverse tube；Static mixing tube 4 has two, is be arranged in parallel with longitudinal tubule (L tubule).
The arrangement group number and size of each injection subelement are determined according to flue size, scaling, interim gaging hole number.
The NO of each injection subelementx/ spike gas dilution wind suction parameter can be non-homogeneous self-defined based on live operational factor,
Specifically, the suction parameter of each injection subelement is NOx/ spike gas dilution wind jet velocity v and NOxConcentration c, scene operation
Parameter is the velocity of flue gas and NO on each discrete point position based on the actual acquisition of interim gaging hole for being arranged in fluexConcentration,
The suction parameter of each injection subelement is obtained by live operational factor, and both transformational relations meet similarity criterion.
Injection direction of the static mixing tube just to nozzle, is hollow cylindrical.
The heterogeneity injection method for SCR cold simulation tests realized based on said apparatus, is comprised the following steps：
Interim gaging hole is opened up in a flue, the velocity of flue gas and NO of multiple discrete point positions is obtainedxConcentration；
Multigroup mutually isostructural injection subelement is arranged in the interim gaging hole position of correspondence in flue；
Each injection subelement sprays NO according to different suction parametersx/ search gas；
Wherein, velocity of flue gas and NO of the different suction parameter according to multiple discrete point positionsxConcentration passes through full
The conversion of sufficient similarity criterion is obtained.
The gaging hole direct measurement reserved in the present embodiment by SCR system entrance horizontal flue is obtained under each constant load operating mode
Entrance NOxConcentration non-uniform Distribution situation, i.e., obtain the NO on each discrete point position in flue gas using flue gas analyzerxConcentration,
Velocity of flue gas on each discrete point position is obtained using Pitot tube, and in this, as NOx4 in concentration heterogeneity injection apparatus
Individual injection subelement NOx/ spike gas dilution wind entrance jet velocity v and inlet flue gas NOxThe injection foundation of concentration, so as to realize
Inputted with the more consistent non-homogeneous entrance of live operating condition, because each gaging hole measures the operation characteristic of 3 depth altogether, therefore cloth
Put that 3 × 4 groups of structures are identical, the different injection subelement of suction parameter.Every group of injection subelement includes NOx/ spike gas
Dilute wind entrance, stand tube, injection nozzle, the part of static mixing tube four.
The scaling of SCR cold simulation tests is 1 in the present embodiment:12, meet similarity criterion related request.
Any two adjacent entries center line horizontal spacing of each injection subelement is 800mm, and longitudinal pitch is 600mm,
Entrance caliber d1 value is 50mm；In a further embodiment, arbitrary neighborhood center line of suction transverse and longitudinal spacing is no more than
800mm, entrance caliber d1 span are 30mm-50mm.
The injection subelement stand tube inner hollow so that NOx/ spike gas dilutes wind entrance boundary and connected with injection nozzle
Logical, single injection subelement arrangement nozzle sum is 8, and nozzle height is 20mm；In a further embodiment, single injection
Unit arrangement nozzle sum is not less than 6, and nozzle height, between 20mm-30mm, is flat mouth or angle form.
The injection subelement static mixing tube is located at the surface of injection nozzle, plane where static mixing tube center line
Height away from injection nozzle pelvic outlet plane is 250mm；In a further embodiment, plane separation spray where static mixing tube center line
The distance of mouth outlet is between 100mm~400mm.
NO in the implementation casexConcentration heterogeneity injection apparatus has mutually isostructural injection subelement common by multigroup
Composition, difference injection subelement has different suction parameters, it is ensured that test parameters more conforms to actual operation heterogeneous
Operating mode.
Based on a kind of NO suitable for SCR cold simulation tests in the present embodimentxConcentration heterogeneity injection apparatus is opened
The cold model experiment research under 100% load, 90% load, 75% load, 60% constant load operating mode is opened up, interception obtains spray ammonia
NO flux Field distribution characteristics in grid section, as shown in Figure 4.The acquisition of NO flux Field distribution characteristics overcomes traditional hypothesis
Entrance NOxThe intrinsic drawback of even concentration distribution, helps accurately to instruct to spray ammonia, production run adjustment is given strong
Guiding opinion.This illustrates a kind of NO suitable for SCR cold simulation tests disclosed in this inventionxConcentration heterogeneity injection dress
Put, NO in cold simulation test can be achievedxThe non-homogeneous input of/spike gas, so that guarantee test parameter more conforms to actual fortune
Row operating mode, helps to lift the precision and reliability of cold model experiment, contributes to Instructing manufacture running optimizatin.
As described above, be flowing and the diffusion property of more real reflection SCR system, improve the precision of cold model experiment with
Reliability, the NO suitable for SCR cold simulation tests that the present invention is providedxConcentration heterogeneity injection apparatus and method, are based on
Field measurement parameter realizes NO in cold simulation testxThe non-homogeneous input of/spike gas, so that in more comprehensive research system
NOx/ and NH3Diffusion process.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not the whole embodiments of the present invention, not to limit
The system present invention, within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc. should be included in
Within protection scope of the present invention.
In addition to technical characteristic described in specification, remaining technical characteristic is technology known to those skilled in the art.
Claims (9)
1. a kind of heterogeneity injection apparatus for SCR cold simulation tests, is arranged in a flue, it is characterised in that bag
Include：
It is multigroup that there is mutually isostructural injection subelement；
Each injection subelement includes：One NOx/ spikes gas dilutes wind inlet tube；Connect NOx/ spikes gas dilution wind inlet tube
One stand tube；It is arranged at multiple nozzles of the stand tube；It is arranged at the static mixing tube of the nozzle of nozzle.
2. it is used for the heterogeneity injection apparatus of SCR cold simulation tests as claimed in claim 1, it is characterised in that described
Flue is the entrance horizontal flue or entrance vertical gas pass of a SCR denitration system.
3. it is used for the heterogeneity injection apparatus of SCR cold simulation tests as claimed in claim 1, it is characterised in that described
Stand tube is a H type pipes, including a pair of transverse tubes；Connect the longitudinal tubule (L tubule) of a pair of transverse tubes；The nozzle is arranged at the longitudinal tubule (L tubule)；It is described
NOx/ spikes gas dilution wind inlet tube is connected with transverse tube；The static mixing tube has two, is be arranged in parallel with the longitudinal tubule (L tubule).
4. it is used for the heterogeneity injection apparatus of SCR cold simulation tests as claimed in claim 1, it is characterised in that each spray
The arrangement group number and size for penetrating subelement are determined according to flue size, scaling, interim gaging hole number.
5. it is used for the heterogeneity injection apparatus of SCR cold simulation tests as claimed in claim 1, it is characterised in that any
Adjacent NOx/ spikes gas dilution wind inlet tube center line transverse and longitudinal spacing is no more than 800mm, entrance caliber d1 span
For 30mm-50mm.
6. it is used for the heterogeneity injection apparatus of SCR cold simulation tests as claimed in claim 1, it is characterised in that each spray
Penetrate the suction parameter of subelement and dilute wind jet velocity v and NOx concentration c for NOx/ spikes gas；Live operational factor is based on cloth
The velocity of flue gas and NOx concentration being placed on each discrete point position of the actual acquisition of the interim gaging hole of flue, respectively spray subelement
Suction parameter obtained by live operational factor；Both transformational relations meet similarity criterion.
7. it is used for the heterogeneity injection apparatus of SCR cold simulation tests as claimed in claim 1, it is characterised in that single
Injection subelement arrangement nozzle sum is not less than 6, and the nozzle height, between 20mm-30mm, is flat mouth or angle form.
8. it is used for the heterogeneity injection apparatus of SCR cold simulation tests as claimed in claim 1, it is characterised in that described
Injection direction of the static mixing tube just to nozzle, is plane separation jet expansion where hollow cylindrical, static mixing tube center line
Distance between 100mm~400mm.
9. a kind of heterogeneity injection method for SCR cold simulation tests, comprises the following steps：
Interim gaging hole is opened up in a flue, the velocity of flue gas and NOx concentration of multiple discrete point positions is obtained；
Multigroup mutually isostructural injection subelement is arranged in the interim gaging hole position of correspondence in flue；
Each injection subelement sprays NOx/ search gas according to different suction parameters；
Wherein, the different suction parameter according to the velocity of flue gas and NOx concentration of multiple discrete point positions by meeting phase
Obtained like the conversion of criterion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710338619.7A CN107149875B (en) | 2017-05-15 | 2017-05-15 | Non-uniform injection device and method for SCR cold-state modeling test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710338619.7A CN107149875B (en) | 2017-05-15 | 2017-05-15 | Non-uniform injection device and method for SCR cold-state modeling test |
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| CN107149875B CN107149875B (en) | 2023-04-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112581848A (en) * | 2020-12-11 | 2021-03-30 | 中国建筑科学研究院有限公司 | Tunnel fire smoke motion measurement simulation test system |
| US11525380B2 (en) | 2019-01-11 | 2022-12-13 | Cummins Emission Solutions Inc. | Aftertreatment system with multiple dosing modules |
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| Publication number | Publication date |
|---|---|
| CN107149875B (en) | 2023-04-11 |
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