CN206897180U - Heterogeneity injection apparatus for SCR cold simulation tests - Google Patents
Heterogeneity injection apparatus for SCR cold simulation tests Download PDFInfo
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- CN206897180U CN206897180U CN201720533478.XU CN201720533478U CN206897180U CN 206897180 U CN206897180 U CN 206897180U CN 201720533478 U CN201720533478 U CN 201720533478U CN 206897180 U CN206897180 U CN 206897180U
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Abstract
The utility model 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/ tracer gas dilutes wind inlet tube；Connect the NOx/ tracer 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 as to which guarantee test parameter more conforms to actual operating mode, improve the precision and reliability of cold model experiment.
Description
Technical field
It the utility model is related to a kind of heterogeneity injection apparatus for SCR cold simulation tests, specifically one
Kind can realize NOxThe SCR cold simulation test devices 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 is very notable to boiler smoke NOx control effects, technology is more ripe, stably, has turned at present
In the world using a kind of most, most fruitful gas denitrifying technologies.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 height then reacts complete, and denitration efficiency otherwise 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 currently optimization to SCR system is substantially using numerical simulation and the double technique plan of cold simulation test checking
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 assume
Nitrogen oxides (the NO of denitration entrancex) after living through a series of turning flue and being 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, use is above-mentioned
Research strategy has some limitations.
Utility model content
In view of the above-mentioned problems, the purpose of this utility model be to provide it is a kind of for the non-homogeneous of SCR cold simulation tests
Property injection apparatus and method, the device can realize NO in SCR cold simulation testsxThe non-homogeneous injection of/search gas, so as to
Guarantee test parameter more conforms to actual operating mode, improves the precision and reliability of cold model experiment.
For the above-mentioned purpose, the utility model adopts the technical scheme that：
A kind of heterogeneity injection apparatus for SCR cold simulation tests, it is arranged in a flue, including：
It is multigroup that there is mutually isostructural injection subelement；
Each injection subelement includes：One NOx/ tracer gas dilutes wind inlet tube；Connect the NOx/ tracer 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/ tracer gas dilution wind inlet tube connects with transverse tube；The static mixing tube has two, with institute
Longitudinal tubule (L tubule) is stated to be arranged in parallel.
Further, arbitrary neighborhood center line of suction transverse and longitudinal spacing is no more than 800mm, entrance caliber d1 span
For 30mm-50mm.
Further, single injection subelement arrangement nozzle sum is not less than 6, and the nozzle height is between 20mm-
30mm, it is flat mouth or angle form.
Further, the injection direction of the static mixing tube face nozzle, is hollow cylindrical, static mixing tube hub
The distance of plane separation jet expansion is between 100mm~400mm where line.
By taking above-mentioned technical proposal, the utility model can realize NO in cold simulation testx/ tracer gas it is non-homogeneous
Input, so as to which guarantee test parameter more conforms to actual operating mode, help to lift the precision and reliability of cold model experiment, have
Help Instructing manufacture running optimizatin.
Brief description of the drawings
Fig. 1 is the NO for being used for SCR cold simulation tests in the embodiment of the utility model onexConcentration heterogeneity injection apparatus
Schematic view of the mounting position.
Fig. 2 is the NO for being used for SCR cold simulation tests in the embodiment of the utility model onexConcentration heterogeneity injection apparatus
Overall overlooking surface arrangement schematic diagram.
Fig. 3 is the NO for being used for SCR cold simulation tests in the embodiment of the utility model onexConcentration heterogeneity injection apparatus
The dimensional structure diagram of middle injection subelement.
Fig. 4 is the NO for being used for SCR cold simulation tests in the embodiment of the utility model onexConcentration heterogeneity injection apparatus
The side structure schematic view of middle injection subelement.
Embodiment
With reference to Figure of description and specific embodiment, the utility model will be further described：
For certain 660MW level coal unit SCR system, the present embodiment provides a kind of for the non-of SCR cold simulation tests
Uniformity injection apparatus, it 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 injection subelement entirety scaling 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 flue size is combined, ensure that each injection subelement can uniformly be covered with whole " flue " section.
With reference to figure 3 and Fig. 4, each subelement that sprays includes：NOx/ tracer gas dilution wind inlet tube 1；Connect NOx/ tracer 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/
Tracer gas dilution wind inlet tube 1 connects 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 determine according to flue size, scaling, interim gaging hole number.
The NO of each injection subelementx/ tracer gas dilution wind suction parameter can be non-homogeneous self-defined based on live operational factor,
Specifically, respectively the suction parameter of injection subelement is NOx/ tracer gas dilution wind jet velocity v and NOxConcentration c, scene operation
Parameter is based on the velocity of flue gas and NO on the actual each discrete point position obtained of the 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.
The injection direction of static mixing tube face nozzle, it 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, obtains the velocity of flue gas and NO of multiple discrete point positionsxConcentration；
Multigroup mutually isostructural injection subelement is arranged in corresponding interim gaging hole position 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 obtains.
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., the NO on each discrete point position in flue gas is obtained 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/ tracer 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/ tracer 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.
Each injection any two adjacent entries center line horizontal spacing of subelement is 800mm, longitudinal pitch 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/ tracer gas dilutes wind entrance boundary and connected with injection nozzle
Logical, single injection subelement arrangement nozzle sum is 8, nozzle height 20mm；In a further embodiment, single injection
Unit arrangement nozzle sum is not less than 6, and nozzle height is flat mouth or angle form between 20mm-30mm.
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 have different suction parameters, ensure 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,.It was found that the acquisition that experiment obtains NO flux Field distribution characteristics overcomes traditional vacation
If entrance NOxThe intrinsic drawback of even concentration distribution, help 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 the utility modelxConcentration heterogeneity
Injection apparatus, NO in cold simulation test can be achievedxThe non-homogeneous input of/tracer gas, so as to which guarantee test parameter more conforms to
Actual operating mode, help to lift the precision and reliability of cold model experiment, contribute to Instructing manufacture running optimizatin.
As described above, be the more really flowing of reflection SCR system and diffusion property, improve the precision of cold model experiment with
Reliability, the NO provided by the utility model suitable for SCR cold simulation testsxConcentration heterogeneity injection apparatus and method,
NO in cold simulation test is realized based on field measurement parameterxThe non-homogeneous input of/tracer gas, so as to more comprehensive research system
NO in systemx/ and NH3Diffusion process.
Preferred embodiment of the present utility model is the foregoing is only, is not whole embodiments of the present utility model,
It is all within the spirit and principles of the utility model not to limit the utility model, any modification for being made, equivalent substitution,
Improve etc., it should be included within the scope of protection of the utility model.
In addition to technical characteristic described in specification, remaining technical characteristic is technology known to those skilled in the art.
Claims (6)
1. a kind of heterogeneity injection apparatus for SCR cold simulation tests, it 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/ tracer gas dilutes wind inlet tube；Connect the NOxThe one of/tracer gas dilution wind inlet tube
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/ tracer gas dilution wind inlet tube connects 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 any
Adjacent NOx/ tracer gas dilution wind inlet tube center line transverse and longitudinal spacing is no more than 800mm, entrance caliber d1 span
For 30mm-50mm.
5. it is used for the heterogeneity injection apparatus of SCR cold simulation tests as claimed in claim 1, it is characterised in that single
Spray subelement arrangement nozzle sum and be not less than 6, the nozzle height is flat mouth or angle form between 20mm-30mm.
6. it is used for the heterogeneity injection apparatus of SCR cold simulation tests as claimed in claim 1, it is characterised in that described
The injection direction of static mixing tube face nozzle, is hollow cylindrical, plane separation jet expansion where static mixing tube center line
Distance between 100mm ~ 400mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720533478.XU CN206897180U (en) | 2017-05-15 | 2017-05-15 | Heterogeneity injection apparatus for SCR cold simulation tests |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720533478.XU CN206897180U (en) | 2017-05-15 | 2017-05-15 | Heterogeneity injection apparatus for SCR cold simulation tests |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206897180U true CN206897180U (en) | 2018-01-19 |
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ID=61288716
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720533478.XU Expired - Fee Related CN206897180U (en) | 2017-05-15 | 2017-05-15 | Heterogeneity injection apparatus for SCR cold simulation tests |
Country Status (1)
| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107149875A (en) * | 2017-05-15 | 2017-09-12 | 大唐环境产业集团股份有限公司 | Heterogeneity injection apparatus and method for SCR cold simulation tests |
-
2017
- 2017-05-15 CN CN201720533478.XU patent/CN206897180U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107149875A (en) * | 2017-05-15 | 2017-09-12 | 大唐环境产业集团股份有限公司 | Heterogeneity injection apparatus and method for SCR cold simulation tests |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180119 |