CN101109741B - Device for testing and analyzing warehouse separated type denitrated catalyzer - Google Patents
Device for testing and analyzing warehouse separated type denitrated catalyzer Download PDFInfo
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- CN101109741B CN101109741B CN2007100926096A CN200710092609A CN101109741B CN 101109741 B CN101109741 B CN 101109741B CN 2007100926096 A CN2007100926096 A CN 2007100926096A CN 200710092609 A CN200710092609 A CN 200710092609A CN 101109741 B CN101109741 B CN 101109741B
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Abstract
The invention discloses a split testing and analyzing device for a denitration catalyst. A split testing reactor (3) communicates a smoke mixing assembly (2) and a smoke cleaning assembly (4); the inner cavity of the split testing reactor (3) are divided into four cavities (3-2) by partition boards (3-1); in the middle of each cavity (3-2), a catalyst basket (3-3) is placed; the catalyst basket (3-3) comprises a main pipe and a sieve mesh; on the catalyst basket (3-3), a hanging hole is provided; between the upper and the lower opening of the cavity (3-2) and the catalyst basket, a sampling port is provided for measuring temperature and pressure for each cavity (3-2). The invention can concurrently carry out performance comparison and test on denitration catalysts of different specifications and types under the same smoke conditions, saves greatly the analysis and test time, and increases the comparability.
Description
Technical field
The present invention relates to a kind of SCR of power plant sampling denitrating catalyst analysis and detection device, specifically, relate to a kind of device for testing and analyzing warehouse separated type denitrated catalyzer that can carry out the performance comparison to dissimilar and catalyzer specification at identical flue gas condition.
Background technology
Denitrating catalyst is the core of the SCR of power plant denitration, and its performance has very important influence to the performance of denitration engineering.Selection of catalysts is unreasonable, not only can cause the indexs such as denitration rate of denitration not reach guarantee value, also can cause the obstruction and the pressure drop of catalyzer to increase, cause the boiler operatiopn fault, in addition, improper if catalyzer is selected, poisoning, wearing and tearing and aging acceleration that also may cause catalyzer, do not reach the serviceable life of expection, need in advance more catalyst changeout.So, also be to use the owner of power plant of denitrating catalyst all to need denitrating catalyst is tested comparison no matter be denitrating catalyst production firm, engineering design side.
At present only when boiler shutdown, take out denitration in the boiler inner catalyst layer with catalyzer return catalizer production firm or send into the laboratory and analyze, observe the physical strength of catalyzer, life-span and poisoning situation, according to active testing, droop loss, physical strength, anti-poisoning situation, life-span and flue gas adaptability make comprehensive evaluation uniformly-spaced the time long, get and change inconvenience, therefore exist and to make timely judgement to the poisoning situation and the reason of denitrating catalyst, particularly the test of multiple denitrating catalyst adaptability and good situation is compared, must under identical environmental baseline, use in the denitration of same boiler smoke each catalyzer, and the identical time on probation, then each catalyzer is taken out, return catalizer production firm or send into the laboratory and carry out analysis-by-synthesis relatively, require a great deal of time, but also can be because boiler is discharged the change of the various parameters of flue gas, the residing environment of each catalyzer is changed, cause the comparability of test findings relatively poor.
Summary of the invention
The invention provides a kind of analysis test apparatus that can adopt many minutes storehouses, can under identical flue gas condition, carry out performance device relatively, for preferred suitable catalyst provides information accurately and effectively dissimilar and catalyzer specification.
Technical scheme of the present invention is as follows: device for testing and analyzing warehouse separated type denitrated catalyzer, and its key of gas cleaning assembly that comprises the mixed assembly of the flue gas that is communicated with the flue gas inlet tube and be communicated with blower unit is: be provided with between mixed assembly of flue gas and gas cleaning assembly and with the warehouse separated type test reactor of both connections; Described warehouse separated type test reactor inner chamber is four cavitys by a minute storehouse plate longitudinal subdivision, at each cavity middle part a catalyzer basket is housed; Described catalyzer basket is made up of the person in charge and screen cloth, on this catalyzer basket lifting hole(eyelet) is set, and by catalyzer basket support frame the catalyzer basket is put in the warehouse separated type test reactor; Be respectively arranged with upstream and downstream thermometric pressure measurement sample tap for each cavity between oral area and the catalyzer basket about the described cavity; The storehouse plate was put in the warehouse separated type test reactor by a minute storehouse plate support frame in described minute, was positioned at plate support frame below, branch storehouse and was provided with the total thermometric pressure measurement in downstream sample tap.
The catalyst elements that the present invention adopts is 150 * 150mm, this is a standard design for honeycombed catalyst, for board-like catalyzer and corrugated plate dst catalyzer, it is worked into 150 * 150 specification, the length of the identical or catalyzer to be selected of operation catalyst length in the length of detecting catalyst and the SCR reactor.In each catalyst space, the catalyst test unit places the catalyzer basket, and catalyzer basket maximum can be held detecting catalyst length 1.5m.The catalyzer basket can use suspension hook that it is taken out, and changes the detecting catalyst module.Catalyzer basket bottom is welded with the cross hang steelframe and supports the detecting catalyst unit.The catalyzer basket places on the small-sized supporting steel frame of each separation, and small-sized steelframe can adopt small-sized angle steel to make, and directly is welded on reactor and the branch storehouse plate.All catalyzer baskets and branch storehouse plate place a bigger framed structure upper support.
Divide the last lower edge of storehouse plate all to keep enough distances apart from catalyzer.The catalyzer upper surface remains on about 600mm apart from a minute plate upper edge, storehouse, to guarantee having sufficiently long mixer to guarantee into to reach the flue gas uniformity of catalyst surface, pressure tap and wind speed measuring point is set about 300mm therein; The catalyzer lower surface remains on about 600mm apart from lower clapboard, wherein in the position of the lower surface of distance catalyzer 300mm, flue gas speed measuring point, point for measuring temperature, pressure tap and sampling spot (analyzing oxides of nitrogen, SO2, NH3 isoconcentration) are set, indexs such as the oxygenation efficiency of the pressure drop of each catalyst elements, denitration rate, SO2, ammonia escapement ratio are compared under identical flue gas condition, and the mithridatism and the life-span of different catalysts comprehensively compared, seek out only catalyst type and catalyzer specification by the least possible test number (TN).
The flue gas inlet tube is provided with the inlet stop valve; The mixed assembly of flue gas upper end is for connecting pipe, and this pipe top is furnished with screw thread or flange, and described connection pipe becomes circle by the side and is communicated with stainless-steel tube; This stainless steel inside pipe wall is welded with micro-mixer, stretches into the jet pipe of blast injection system below micro-mixer, is positioned on this jet pipe to being arranged with nozzle, and described flue gas mixer assembly lower end is provided with square flange; The warehouse separated type test reactor is that the cross section is foursquare column structure, and the upper end adopts square flange to connect, and the lower end is communicated with lower linking tube by Fang Bianyuan and adopts round flange to connect.Described exhanst gas outlet purification plant is provided with and is used for the infundibulate tornado dust collector of dedusting, and these tornado dust collector are connected with variable valve one end of flue gas tolerance, and the other end of variable valve is connected with the flowmeter that measures; Whirlwind inlet tube upper end is provided with the flange that is connected with the warehouse separated type test reactor, and insert in the tornado dust collector its lower end; On the sidewall of described tornado dust collector level-sensing device is housed, exhaust-valve and evacuated tube are equipped with in the lower end.The main body of blower unit is an induced draft fan, and the induced draft fan inlet tube is communicated with by the outlet of flange-connection stainless steel metal flexible pipe with the outlet smoke eliminator; The induced draft fan outlet links to each other with threeway, and an endpiece of this threeway connects exhaust-valve; Another endpiece is that flue gas returns adapter, which is provided with outlet shutoff valve.
In order to prevent the flue gas short circuit,, adopt the resistant to elevated temperatures fiberglass sealed of inertia between catalyst test unit and the catalyzer basket and between catalyzer basket and branch storehouse plate and the reactor jacket.
On minute storehouse plate, establish total point for measuring temperature, pressure tap and sample tap (test O2, H2O steam, SO2, oxides of nitrogen and dust concentration etc.).For the warehouse separated type test macro that does not have operation SCR reactor, need carry out regulating and controlling to ammonia spraying amount according to outlet nitrous oxides concentration, total flue gas flow and ammonia escape value, so static mixer and sample tap are set in the reactor catalyst downstream, flue gas behind the differential responses pathway reaction is mixed, test nitrous oxides concentration and ammonia escape value etc. wherein is according to the emitted dose of oxides of nitrogen, ammonia escape value and the total flow control ammonia of outlet flue gas after the test mixing of back.For the test macro of building the SCR reactor,, also need not to measure total nitrous oxides concentration because the existing ammonia gas react agent in upstream so need not according to outlet NOx concentration ammonia spraying amount to be regulated, can not established catalyzer downstream static mixer.For two states, after minute storehouse, all need to be provided with pressure tap, judge when open the compressed air soot-blowing device according to the pressure drop of main channel, catalyzer is purged.
Test reactor adopts flange to be connected with upstream component, and the side of setting, downstream is connected with pipe after becoming circle, and pipe adopts flange to be connected with the cyclone separator in downstream.
After closing the valve of upstream and downstream, the catalyst module that can take out, return catalizer production firm or send into the laboratory and analyze, observe physical strength, life-span and the poisoning situation of catalyzer, make comprehensive evaluation according to active testing, droop loss, physical strength, anti-poisoning situation, life-span and flue gas adaptability, optimize appropriate catalyst type and specification.
Being described as follows of the miscellaneous part of warehouse separated type denitrated catalyzer analysis test apparatus:
The flue gas fairlead: flue gas is drawn through the flue gas fairlead in boiler flue or SCR reactor and is entered this denitrating catalyst detecting and analysing system.For the SCR reactor of having built, flue gas from the catalyzer upstream, the static mixer downstream directly draws;
The layout of ammonia jetting system: owing to be sprayed with an amount of NH3 in the flue gas, can directly enter and enter catalyzer after mixer mixes and carry out denitration reaction; For the test macro that the SCR denitrification apparatus is not installed, flue gas is taken from the flue between economizer and the air preheater, because the required ammonia of no denitration reaction in the flue gas, need set up ammonia generation metering injection system, ammonia sprays into detecting and analysing system through spray ammonia mouth after metering and carries out denitration reaction, and the emitted dose of ammonia is carried out regulating and controlling according to flue gas total amount, outlet nitrous oxides concentration and ammonia escape value;
Inlet stop valve: on the pipeline of introducing part, stop valve is set, timely off-response test macro when the flue gas overtemperature.When catalyst changeout more and when blowing ash, also need close this valve;
The upstream static mixer: the upstream in the warehouse separated type test reactor is provided with static mixer, and is identical with flue gas concentration, flue gas flow rate and the dust concentration etc. that guarantee arrival different catalysts surface;
Main chimney flue upstream sampling and testing system: in the downstream of mixer, the upstream of soot blower sample tap is set, parameters such as the flow of testing total flue, O2 concentration, water vapor concentration, NOx concentration, SO2 concentration and temperature;
Soot blower: in order to prevent the obstruction of catalyzer, in the catalyzer upstream compressed air soot-blowing device is set, soot blower places in the flue gas mixer assembly of upstream of warehouse separated type test reactor joint flange;
Exhanst gas outlet purification plant and blower unit: last flue gas directly discharges or returns in the boiler flue through the flue gas evacuated tube through induced draft fan air inducing after the cyclone separator dedusting.Variable valve and flowmeter are arranged on the flue after the dedusting, regulate and control the total flow that enters in the reaction test system.Cyclone separator is provided with outlet valve, and the ash bucket bottom is provided with exhaust-valve, observes the ash position in the ash bucket, and level-sensing device is set on ash bucket, can in time discharge flying dust;
Other: are in order to prevent thermal loss and scald operating personnel that all high-temperature components all need to be provided with attemperator.For the safety of system, need platform and fixed support device etc. be set in place according to field condition.
Beneficial effect: device for testing and analyzing warehouse separated type denitrated catalyzer provided by the invention can be under identical flue gas condition carries out performance relatively and test to the denitrating catalyst of multiple different size and type simultaneously, can preferably compare multiple catalyzer, save the analytical test time greatly, increase comparability, not only can be used for having built preferably suitable catalyst more of SCR denitrification apparatus power plant, the power plant that also can be used for SCR denitration engineering yet to be built compares multiple catalyzer, also can be used for denitrating catalyst production firm preparing catalyst to be selected is carried out preferably.
Description of drawings
Fig. 1 is the device for testing and analyzing warehouse separated type denitrated catalyzer structural representation;
Fig. 2 is the mixed assembly 2 syndeton synoptic diagram of flue gas inlet tube 1 and flue gas;
Fig. 3 is a warehouse separated type test reactor structural representation;
Fig. 4 is the A-A cut-open view of Fig. 3;
Fig. 5 is the F-F cut-open view of Fig. 3;
Fig. 6 is gas cleaning assembly 4 structural representations;
Fig. 7 is blower unit 5 structural representations;
Fig. 8 is the structural representation of embodiment 2;
Fig. 9 is the mixed assembly 2 syndeton synoptic diagram of embodiment 2 flue gas inlet tubes 1 and flue gas;
Figure 10 is embodiment 2 warehouse separated type test reactor structural representations.
Embodiment
Embodiment 1
The invention will be further described below in conjunction with drawings and Examples:
See also Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 device for testing and analyzing warehouse separated type denitrated catalyzer, by flue gas inlet tube 1, flue gas mixes assembly 2, blower unit 5, gas cleaning assembly 4 compositions such as grade, be communicated with the mixed assembly 2 of flue gas of flue gas inlet tube 1 and be communicated with between the gas cleaning assembly 4 of blower unit 5 warehouse separated type test reactor 3 is set, this warehouse separated type test reactor 3 is communicated with mixed assembly 2 of flue gas and gas cleaning assembly 4, described warehouse separated type test reactor 3 inner chambers are four cavity 3-2 by a minute storehouse plate 3-1 longitudinal subdivision, be provided with a catalyzer basket 3-3 at each cavity 3-2 middle part, branch storehouse plate 3-1 put in warehouse separated type test reactor 3 by a minute storehouse plate support frame 3-4; This catalyzer basket 3-3 is made up of the person in charge and screen cloth, on this catalyzer basket 3-3 lifting hole(eyelet) is set, and 3-5 puts catalyzer basket 3-3 in warehouse separated type test reactor 3 by catalyzer basket support frame; Be respectively arranged with thermometric pressure measurement sample tap for each cavity 3-2 between oral area and the catalyzer basket about the described cavity 3-2.
Further find out that by Fig. 2, Fig. 3, Fig. 6, Fig. 7 flue gas inlet tube 1 is provided with inlet stop valve 1-1; Mixed assembly 2 upper ends of flue gas are for connecting pipe 2-1, and this pipe 2-1 is furnished with at the top screw thread or flange, and described connection pipe 2-1 becomes circle 2-2 by the side and is communicated with stainless-steel tube 2-3; This stainless-steel tube 2-3 inwall is welded with micro-mixer 2-4, stretches into the jet pipe 2-5 of blast injection system below micro-mixer 2-4, is positioned at this jet pipe 2-5 and goes up to being arranged with nozzle, and described flue gas mixer assembly 2 lower ends are provided with square flange 2-6.Warehouse separated type test reactor 3 is that the cross section is foursquare column structure, and the upper end adopts square flange 3-9 to connect, and the lower end is communicated with lower linking tube 3-7 by side's change circle 3-6 and adopts round flange 3-8 to connect.Exhanst gas outlet purification plant 4 is provided with and is used for the infundibulate tornado dust collector 4-3 of dedusting, and these tornado dust collector 4-3 is connected with variable valve 4-7 one end of flue gas tolerance, and the other end of variable valve 4-7 is connected with the flowmeter 4-8 that measures; Whirlwind inlet tube 4-2 upper end is provided with the flange 4-1 that is connected with warehouse separated type test reactor 3, and insert among the tornado dust collector 4-3 its lower end; Level-sensing device 4-6 is housed on the sidewall of described tornado dust collector 4-3, and exhaust-valve 4-5 and evacuated tube 4-4 are equipped with in the lower end.The main body of blower unit 5 is induced draft fan 5-5, and induced draft fan inlet tube 5-4 is communicated with by the outlet 4-9 of flange-connection stainless steel metal flexible pipe with outlet smoke eliminator 4; Induced draft fan outlet 5-3 links to each other with threeway 5-2, and an endpiece of this threeway meets exhaust-valve 5-1; Another endpiece is that flue gas returns adapter 5-6, which is provided with outlet shutoff valve 5-7.
For the power plant that the SCR reactor is arranged, use from taking out an amount of flue gas between the superiors' catalyst layer and the static mixer; When too high or too low for temperature, surpass the range of operation of catalyst module, the off-response test macro.
Installing or more during catalyst changeout, opening the flange of reactor, use suspension hook that the catalyzer basket is taken out, the detecting catalyst module is packed in the catalyzer basket.Catalyst module is got 150 * 150 standard cellular shape catalyst module, for board-like catalyzer and corrugated plate dst catalyzer, then cuts out 150 * 150 size.In loading procedure, use the refractory glass fibre of inertia to prevent that flue gas is between catalyst module and the catalyzer basket and short circuit between catalyzer basket and the hydrogen-catalyst reactor.The catalyzer basket is put on inner steelframe.
When normal operation, nitrous oxides concentration, SO2 concentration and temperature in to the main entrance, the pressure of each upstream, catalyst test unit, the flow of the pressure in each downstream, catalyst test unit, nitrous oxides concentration, SO2 concentration and ammonia escape value and general export is measured.In operational process, need to observe the level-sensing device of cyclone separator, in time discharge the flying dust in the ash bucket.
Observing pressure drop when excessive, need open the compressed air soot-blowing device catalyzer is purged.At needs more during catalyst changeout, close induced draft fan, inlet valve and cyclone separator outlet valve, open radish ash discharge valve, behind the emptying dust stratification, adopt pressurized air to purge cooling again, until opening valve, use suspension hook to take out catalyzer basket and catalyst module to room temperature.
The catalyst module that takes out, can return catalizer production firm or send into the laboratory and analyze, observe physical strength, life-span and the poisoning situation of catalyzer, make comprehensive evaluation according to active testing, droop loss, physical strength, anti-poisoning situation, life-span and flue gas adaptability, optimize appropriate catalyst type and specification.
See also Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10 compares candidate's catalyzer for the power plant of no SCR reactor, that different is the nozzle 2-1 that stretches into the ammonia metering injection system in mixed assembly 2 upper ends of flue gas for the relative embodiment of device for testing and analyzing warehouse separated type denitrated catalyzer 1, being positioned at branch storehouse plate support frame in the warehouse separated type test reactor 3 transfers and is welded with static mixer 3-9, downstream pressure measurement sample tap 3-10 is set up in this static mixer below, and flue gas is drawn from suitable temperature range between economizer and the air preheater.When too high or too low for temperature, surpass the range of operation of catalyst module, the off-response test macro.
Under the situation of no SCR Benitration reactor, need spray into ammonia could in the denitrating catalyst module denitration reaction take place.The emitted dose of ammonia need regulate and control according to denitration rate, ammonia escapement ratio and total flue gas flow of downstream test.
When normal operation, nitrous oxides concentration, SO2 concentration and temperature in to the main entrance, the pressure of each upstream, catalyst test unit, the flow of the pressure in each downstream, catalyst test unit, nitrous oxides concentration, SO2 concentration and ammonia escape value and general export is measured.For no SCR reactor, also need general export nitrous oxides concentration and ammonia escapement ratio are measured.
Claims (6)
1. device for testing and analyzing warehouse separated type denitrated catalyzer, comprise the mixed assembly (2) of the flue gas that is communicated with flue gas inlet tube (1) and be communicated with the gas cleaning assembly (4) of blower unit (5), it is characterized in that: setting and between mixed assembly (2) of flue gas and gas cleaning assembly (4) the warehouse separated type test reactor (3) of both connections; Described warehouse separated type test reactor (3) inner chamber is four cavitys (3-2) by minute storehouse plate (3-1) longitudinal subdivision, at each cavity (3-2) middle part a catalyzer basket (3-3) is housed; Described catalyzer basket (3-3) is made up of the person in charge and screen cloth, on this catalyzer basket (3-3) lifting hole(eyelet) is set, and by catalyzer basket support frame (3-5) catalyzer basket (3-3) is put in warehouse separated type test reactor (3); Described cavity (3-2) is respectively arranged with upstream and downstream thermometric pressure measurement sample tap (3-10,3-11) for each cavity (3-2) between oral area and the catalyzer basket up and down; Described minute the storehouse plate (3-1) put in warehouse separated type test reactor (3) by branch storehouse plate support frame (3-4), be positioned at branch storehouse plate support frame (3-4) below and be provided with the total thermometric pressure measurement in downstream sample tap (3-12).
2. according to the described device for testing and analyzing warehouse separated type denitrated catalyzer of claim 1, it is characterized in that: flue gas inlet tube (1) is provided with inlet stop valve (1-1).
3. according to the described device for testing and analyzing warehouse separated type denitrated catalyzer of claim 1, it is characterized in that: described flue gas mixes assembly (2) upper end for connecting pipe (2-1), this pipe (2-1) top is furnished with screw thread or flange, and described connection pipe (2-1) is communicated with stainless-steel tube (2-3) by Fang Bianyuan (2-2); This stainless-steel tube (2-3) inwall is welded with micro-mixer (2-4), stretch into the jet pipe (2-5) of blast injection system in micro-mixer (2-4) below, being positioned at this jet pipe (2-5) goes up to being arranged with nozzle, described flue gas mixer assembly (2) lower end is provided with square flange (2-6), is positioned between this square flange (2-6) and the jet pipe (2-5) to be provided with the total thermometric pressure measurement in upstream sample tap (2-7).
4. according to the described device for testing and analyzing warehouse separated type denitrated catalyzer of claim 1, it is characterized in that: warehouse separated type test reactor (3) is that the cross section is foursquare column structure, the upper end adopts square flange (3-9) to connect, the lower end is communicated with lower linking tube (3-7) by Fang Bianyuan (3-6), and this lower linking tube (3-7) termination adopts round flange (3-8) to connect.
5. according to the described device for testing and analyzing warehouse separated type denitrated catalyzer of claim 1, it is characterized in that: described exhanst gas outlet purification plant (4) is provided with and is used for the tornado dust collector (4-3) of dedusting, these tornado dust collector (4-3) are connected with variable valve (4-7) end of flue gas tolerance, and the other end of variable valve (4-7) is connected with the flowmeter that measures (4-8); Whirlwind inlet tube (4-2) upper end is provided with the flange (4-1) that is connected with warehouse separated type test reactor (3), and insert in the tornado dust collector (4-3) its lower end; Level-sensing device (4-6) is housed on the sidewall of described tornado dust collector (4-3), and exhaust-valve (4-5) and evacuated tube (4-4) are equipped with in the lower end.
6. according to the described device for testing and analyzing warehouse separated type denitrated catalyzer of claim 1, it is characterized in that: the main body of blower unit (5) is an induced draft fan (5-5), and induced draft fan inlet tube (5-4) is communicated with by the outlet (4-9) of flange-connection stainless steel metal flexible pipe with outlet smoke eliminator (4); Induced draft fan outlet (5-3) links to each other with threeway (5-2), and an endpiece of this threeway connects exhaust-valve (5-1); Another endpiece is that flue gas returns adapter (5-6), which is provided with outlet shutoff valve (5-7).
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102288724B (en) * | 2011-05-06 | 2013-10-09 | 东南大学 | Portable denitration catalyst performance testing device |
| CN103018408B (en) * | 2012-12-10 | 2014-10-22 | 中国船舶重工集团公司第七一八研究所 | Device for testing dehydrogenation performance |
| CN105699604B (en) * | 2016-03-30 | 2017-11-21 | 大唐环境产业集团股份有限公司 | A kind of flue gas measurement apparatus |
| CN105866322A (en) * | 2016-05-03 | 2016-08-17 | 浙江三龙催化剂有限公司 | Mobile flue gas denitrification catalyst performance testing device |
| CN106644824B (en) * | 2017-02-08 | 2024-04-05 | 大唐南京环保科技有限责任公司 | SCR denitration catalyst pressure drop testing arrangement |
| CN110208464A (en) * | 2019-03-26 | 2019-09-06 | 青岛中和电力科技开发有限公司 | A kind of smoke composition content detection device and detection method |
| CN112730139A (en) * | 2020-12-02 | 2021-04-30 | 华电电力科学研究院有限公司 | Device and method for detecting abrasion performance of SCR denitration catalyst |
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