CN205280700U - SCR denitration catalyst detection lab scale rectifier for device and device thereof - Google Patents
SCR denitration catalyst detection lab scale rectifier for device and device thereof Download PDFInfo
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- CN205280700U CN205280700U CN201521140865.4U CN201521140865U CN205280700U CN 205280700 U CN205280700 U CN 205280700U CN 201521140865 U CN201521140865 U CN 201521140865U CN 205280700 U CN205280700 U CN 205280700U
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- 239000003054 catalyst Substances 0.000 title claims abstract description 39
- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 62
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 38
- 238000012360 testing method Methods 0.000 claims description 35
- 229910052757 nitrogen Inorganic materials 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 229910001868 water Inorganic materials 0.000 claims description 14
- 239000006200 vaporizer Substances 0.000 claims description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 2
- 239000003546 flue gas Substances 0.000 abstract description 30
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 28
- 230000000694 effects Effects 0.000 description 18
- 238000000034 method Methods 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 7
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 6
- 239000000376 reactant Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000012159 carrier gas Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 229910052728 basic metal Inorganic materials 0.000 description 1
- 150000003818 basic metals Chemical class 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011020 pilot scale process Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The utility model provides a SCR denitration catalyst detection lab scale rectifier for device and device thereof, rectifier 33 is both ends open -ended cavity sleeve pipe shape, and can the detachable cover locates the flue gas entry end of the sample box 31 that loads the catalyst, the cross section of an arbitrary department of the inner space that the cavity sleeve pipe encloses is the same with sample box cross section, and the inner space that encloses of cavity sleeve pipe and sample box inner space form continuous unobstructed passageway, the inner space is controlled baffle quantity and is set up the position along vertically setting up at least one baffle 331 for the baffle can roughly cover the catalyst surface of sample box opening one side, and the baffle and the cross section of the residual space that the inner space formed respectively and the cross section in the space that forms between the catalyst corresponding.
Description
Technical field
The utility model belongs to electric power environmental engineering technical field of air pollution control, particularly relates to a kind of SCR denitration Activity determination equipment. Specifically, the utility model relates to a kind of SCR denitration detection small testing device rectifier and device thereof.
Background technology
In order to meet the NOx emission standard of increasingly stringent, selective catalytic reduction (SCR) has become the mainstream technology of thermal power plant's oxynitride control, and denitration efficiency is up to more than 85%. The principle of SCR method denitration sprays into NH in boiler emission flue gas3Deng reductive agent, under catalyst action, generate harmless N with the NOx in flue gas2And H2O. Catalyzer is the core of thermal power plant's SCR flue gas denitrification system, and catalyzer all adopts integral catalyzer, and pattern mainly contains honeycomb fashion and flat, mainly with TiO2For the V of carrier2O5Base commercial catalysts.
The quality of catalyst performance generally represents with catalyst activity, and the activity of catalyzer refers to catalyst NH3With the integration capability of NOx chemical reaction. Denitrating catalyst also exists the problem of activity decrease in application process, causes the reason of catalyst deactivation a lot, both relevant with flue gas characteristic, is also subject to the impact of operation scheme. Flying dust in flue gas, basic metal, alkaline-earth metal, metal oxide and arsenic etc. may blocking catalyst micropore or produce chemistry toxic action, and cause catalyzer to lose activity. In addition, in flue gas, denitration activity also can be impacted by temperature variation, and temperature is too low is unfavorable for denitration reaction, and temperature is too high, causes the irreversible changes such as catalyzer sintering.
Catalyst activity is directly connected to denitrating flue gas efficiency, and then affect flue gas whether qualified discharge, therefore the Activity determination of catalyzer is carried out, understanding catalyst performance with variation characteristic working time, running optimizatin and formulation catalyzer management plan for thermal power plant's denitrating system all have important meaning. At present, mainly through building special device, to simulate denitration catalyst reaction, according to nitrous oxides concentration calculated activity before and after reaction. Size size according to sample, device is divided into pilot plant and small testing device. Pilot plant directly chooses cell cube as sample, and small testing device then needs that cell cube cuts into little sample and detects.
Catalyst activity testing equipment generally comprises five parts, such as flue gas generation systems, Gas Parameters regulation system, reactor assembly, gas cleaning and blowdown system and Gas Parameters measuring system etc. Catalyst activity detection pilot plant wherein, carries out for complete cellular catalyst cell cube or according to the flat catalyzer after particular requirement cutting, and sample is positioned in reactor; Generally form simulated flue gas with gas-firing, control exhaust gas volumn by mass flowmeter; By Gas Parameters before and after online flue gas analyzing apparatus test reaction, calculate catalyst activity.
The sample that pilot plant needs is catalyst elements body, reactor bulky, and device floor space is huge; Controlling System is complicated; Needing very high flue gas flow, testing cost is very high, and general laboratory is difficult to purchase this kind of detection device. In addition, due to needs catalyst elements body, on-site sampling is also comparatively difficult. If power plant is not furnished with corresponding catalyzer spare unit, the breach caused because sampling cannot be filled up, the overall denitration efficiency of influential system.
Experimentation cost is low because possessing for active testing small testing device, the repeated good feature of test result, applies comparatively extensive. Sample is fixed in sample box, and sample box is generally steel rectangular parallelepiped, and its cross section is the square of length of side 20-50mm, and length is generally 200-300mm. Test flue gas generally adopts distribution method to produce. Its device flow process, test process are all identical with pilot scale test set with method of calculation etc.
Owing to being subject to test sample size limitation, flow of flue gas condition and engineering physical presence bigger difference in catalyzer in small testing device, if flow velocity in hole is often lower than actual flow velocity 1-2 order of magnitude, have influence on the mass transfer etc. of fluid in catalyzer micropore, what apply that this device to test obtains is active relative value, and result can not directly apply to actual denitrating system.
Practical novel content
An object of the present utility model is to provide a kind of SCR denitration detection small testing device rectifier;
Another object of the present utility model is to provide a kind of SCR denitration detection small testing device.
For reaching above-mentioned purpose, on the one hand, the utility model provides a kind of SCR denitration detection small testing device rectifier, wherein, described rectifier 33 is the hollow sleeve shape of both ends open, and dismountable can be sheathed on the smoke inlet end of the sample box 31 of loading catalyst, the cross section at any place of the internal space that described hollow sleeve surrounds is identical with sample box cross section, and the internal space that surrounds of hollow sleeve and sample box internal space form the unobstructed passage of continuous print, described internal space longitudinally arranges at least one dividing plate 331, control dividing plate quantity and position is set, dividing plate is made can roughly to cover the catalyst surface of sample box opening side, and the cross section in dividing plate and the residue space that described internal space is formed respectively and the cross section in the space formed between catalyzer corresponding.
According to some specific embodiments of the utility model, wherein, described rectifier outer 332 is stainless steel, and internal layer 333 is high temperature resistant inert material.
According to some specific embodiments of the utility model, wherein, described inert material is selected from stainless steel plate or ceramic plate.
According to some specific embodiments of the utility model, wherein, described dividing plate is dismountable is arranged at described internal space.
According to some specific embodiments of the utility model, wherein, described rectifier height is the 1/5��1/3 of sample box height.
According to some specific embodiments of the utility model, wherein, described dividing plate is 4, wherein two two inwalls abutting in rectifier relative are arranged, another two equidistant and parallel centres being arranged at two dividing plates pasting inner wall so that four dividing plates and rectifier inwall form three identical exhaust gases passes 14.
On the other hand, the utility model additionally provides a kind of SCR denitration detection small testing device, and wherein, described device comprises: gas distributing system 1, gas mixing system 2, reactive system 3, cooling separation 4 and Gas Parameters measuring system 5; Wherein reactive system 3 comprises the rectifier 33 described in sample box 31, well heater 32 and claim 1��6 any one, and wherein rectifier 33 is set in sample box 31 top, and well heater 32 is for heating sample box 31; Gas distributing system 1, gas mixing system 2, reactive system 3 and cooling separation 4 are linked in sequence, and Gas Parameters measuring system 5 is for monitoring before entering reactive system and through the gas of reactive system.
According to some specific embodiments of the utility model, wherein, gas distributing system 1 comprises air compressor 11, Nitrogen plant 12, water vaporizer 13, ammonia gas cylinder 14, NO gas cylinder 15 and SO2Gas cylinder 16, wherein air compressor 11 is connected to produce nitrogen with Nitrogen plant 12, the oxygen outlet 111 of air compressor 11, the nitrogen outlet 121 of Nitrogen plant, NO gas cylinder 15 and SO2Gas cylinder 16 converges via pipeline with the steam outlet 131 of water vaporizer 13 and is connected with the mixing tank 21 of gas mixing system 2, and ammonia gas cylinder 14 converges via pipeline with gas mixing system 2 and is connected with reactive system 3.
According to some specific embodiments of the utility model, wherein, the pipeline being connected with the steam outlet 131 of ammonia gas cylinder 14, air compressor oxygen outlet 111, Nitrogen plant nitrogen outlet 121, NO gas cylinder 15, SO2 gas cylinder 16 and water vaporizer independently arranges mass flowmeter 6.
According to some specific embodiments of the utility model, wherein, gas mixing system also comprises pre-heaters 22, the oxygen outlet 111 of air compressor, the nitrogen outlet 121 of Nitrogen plant, NO gas cylinder 15 and SO2Gas cylinder 16 is connected with described pre-heaters 22 after converging via pipeline with the steam outlet 131 of water vaporizer, then is connected with mixing tank 21.
The utility model additionally provides the method for application rectifier described in the utility model detection SCR denitration activity.
According to some specific embodiments of the utility model, wherein, described method comprises and by described rectifier, simulated flue gas is entered into sample box reacts with the catalyzer in sample box, wherein simulated flue gas in sample box in hole flow velocity be 0.1-5.0m/s, it is preferable that air speed is 3000-50000h-1, it is also preferred that the temperature of reaction of simulated flue gas in sample box is 280-380 DEG C.
According to some specific embodiments of the utility model, wherein, described method comprises the steps:
(1) get catalyst samples, place in sample box; Preferred sample is parallel to each other placement; It is also preferred that get 4, being wherein close to sample box inwall for 2, another two panels is evenly placed on the centre of the two panels being close to sample box inwall again so that form roughly the same air ventilation passage between the two panels sample closed on;
(2) rectifier is set in sample box top, and the residue space making sample box inside is corresponding with the air ventilation passage in sample box;
(3) leading to the mixed gas of the reactant gases into known quantity and carrier gas, the flue gas generated after reaction is through cooling discharge, and mixed gas before reacting with flue gas analyzing apparatus on-line monitoring and the flue gas that obtains after reaction, calculate activity value; Wherein preferred reactant gas is NO, O2��SO2And H2O; Preferred carrier gas is N2; Preferred reactant gas and carrier gas before entering sample box through preheating.
In sum, the utility model provides a kind of SCR denitration detection small testing device rectifier and device thereof and application. Scheme tool of the present utility model has the following advantages:
The utility model is catalyst activity test small testing device, and testing cost is low; Owing to have employed rectifier, gas flow condition is closer to actual engineering, and gained result can directly apply to engineering design and denitration system of power plant optimization and operation.
Accompanying drawing explanation
Fig. 1 is the rectifier schematic diagram of the utility model embodiment 1;
Fig. 2 is the SCR denitration detection small testing device schematic diagram of the utility model embodiment 1;
Fig. 3 be the utility model embodiment 1 loading catalyst after sample box cross sectional representation.
Embodiment
The useful effect of implementation process of the present utility model and generation is described in detail, it is intended to help reader to understand essence of the present utility model and feature better below by way of specific embodiment, not as can the restriction of practical range to this case.
Embodiment 1
The utility model device comprises gas distributing system, gas and vapor permeation and preheater, reactive system (containing rectification function), cooling separation and Gas Parameters measuring system etc., and wherein the rectifier in reactive system is key of the present utility model. The structure of the utility model device is as depicted in figs. 1 and 2.
Test needs use six kinds of gases, i.e. N2��O2��NO��SO2��NH3��H2O��N2Obtain through Nitrogen plant 12 by pressurized air, O2There is provided by air compressor 11, NO, SO2��NH3Three kinds of gases all adopt 10% standard steel cylinder gas, N2��O2��NO��SO2After gas is reduced pressure by respective reducing valve, enter pre-heaters 22 by mass flowmeter control respectively and carry out preheating, and in mixing tank 21, realize fully mixing. Water vapour extracts deionized water via micro pump 132, evaporates through water vaporizer 13 and is formed, then enters into pre-heaters together with reactant gases. NH3Add after mixing tank.
Reactive system comprises well heater (process furnace) 32, rectifier 33 and sample box 31, and wherein process furnace is used for heatable catalyst to reach design temperature, and furnace chamber is round shape, adopts five sections of formula heating. sample box is steel sleeve pipe, for loading catalyst. rectifier is key of the present utility model, it is steel sleeve pipe, it is fixed on sample box, length is the 1/5 of sample box, according to loading catalyst pattern, inside forms some square or rectangular passages by stainless material, and passage is completely parallel with the duct formed after sample box loading catalyst, after flue gas enters rectifier, flow pattern turns into laminar flow gradually from turbulent flow, then catalyst layer is entered with laminar flow, the flow condition of catalyst layer flue gas in the actual engineering of this simulation, improve active testing result precision, and test data can directly apply to engineering design and running optimizatin. catalyst sample is first placed in test kit, and rectifier is fixed in test kit upper end, is then jointly placed in Reaktionsofen, and smoke entrance is equipped with surveys temperature point. flue gas composition before and after reactor is discharged after being processed by cooling separation (condenser) 4 by Gas Parameters measuring system (flue gas analyzing apparatus) 5 on-line monitoring, reacted gas.
First catalyst samples is cut into before test the test film of 22mm*300mm, need 4 altogether, it is placed in sample box, wherein being close to sample box wall for 2, ensure without space, two panels is placed on centre in addition, 6mm it is spaced apart between sheet and sheet, forming 3 air ventilation passage, after loading catalyst, sample box cross section is the square of 22mm*22mm, as shown in Figure 3. Corresponding, by stainless steel substrates gap-forming 3 passages in rectifier, cross section is the square of 22mm*22mm, and length is 30mm, is fixed on sample box, together loads in electric furnace.
According to test condition, lead to reactant gases NO, O into known quantity2��SO2��H2O and carrier gas N2, respectively through preheater, mixing tank, reach after certain temperature with NH3Together entering rectifier, after carrying out rectification, react in reactor, temperature of reaction, by being arranged at catalyzer rectifier upper end and the thermocouple measurement of the lower end of sample box, makes it reach set temperature value by control heating by electric cooker temperature. Reacted flue gas is discharge after condenser processes. Flue gas composition before and after catalyzed reaction is by flue gas analyzing apparatus on-line monitoring, and then calculates activity value.
The scope of this unit simulation flue gas condition is as follows: temperature of reaction is at 280-380 DEG C; Air speed SV is at 3000-50000h-1, in hole, flow velocity is at 0.1-5.0m/s.
Illustrate as follows: get board-like catalyzer that is fresh and operation 5000h respectively, cut into regulation shape, be placed in sample box, be then placed in Reaktionsofen together with rectifier. Simulated flue gas becomes to be grouped into: NO is 500ppm, SO2For 1000ppm, O2Being 3.5%, all the other are N2, NH3/ NO is 1.1; Temperature of reaction is 350 DEG C, and air speed is 35000h-1, the catalyst activity value of acquisition is respectively 53.0m/h and 50.2m/h.
Claims (10)
1. a SCR denitration detection small testing device rectifier, it is characterized in that, the hollow sleeve shape that described rectifier (33) is both ends open, and the smoke inlet end of dismountable sample box (31) being sheathed on loading catalyst, the cross section at any place of the internal space that described hollow sleeve surrounds is identical with sample box cross section, and the internal space that surrounds of hollow sleeve and sample box internal space form the unobstructed passage of continuous print, described internal space longitudinally arranges at least one dividing plate (331), control dividing plate quantity and position is set, dividing plate is made can roughly to cover the catalyst surface of sample box opening side, and the cross section in dividing plate and the residue space that described internal space is formed respectively and the cross section in the space formed between catalyzer corresponding.
2. rectifier according to claim 1, it is characterised in that, described rectifier is made up of outer (332) and internal layer (333); And outer (332) are stainless steel plate, internal layer (333) is high temperature resistant inert material plate.
3. rectifier according to claim 2, it is characterised in that, described high temperature resistant inert material is selected from stainless steel plate or ceramic plate.
4. rectifier according to claim 1, it is characterised in that, described dividing plate is dismountable is arranged at described internal space.
5. rectifier according to claim 1, it is characterised in that, described rectifier height is the 1/5��1/3 of sample box height.
6. rectifier according to claim 1, it is characterized in that, described dividing plate is 4, wherein two two inwalls abutting in rectifier relative are arranged, another two equidistant and parallel centres being arranged at two dividing plates pasting inner wall so that four dividing plates and rectifier inwall form three identical exhaust gases passes (14).
7. a SCR denitration detection small testing device, it is characterized in that, described device comprises: gas distributing system (1), gas mixing system (2), reactive system (3), cooling separation (4) and Gas Parameters measuring system (5); Wherein reactive system (3) comprises the rectifier (33) described in sample box (31), well heater (32) and claim 1��6 any one, wherein rectifier (33) is set in sample box (31) top, and well heater (32) is for heating sample box (31); Gas distributing system (1), gas mixing system (2), reactive system (3) and cooling separation (4) are linked in sequence, and Gas Parameters measuring system (5) is for monitoring before entering reactive system and through the gas of reactive system.
8. device according to claim 7, it is characterized in that, described gas distributing system (1) comprises air compressor (11), Nitrogen plant (12), water vaporizer (13), ammonia gas cylinder (14), NO gas cylinder (15) and SO2Gas cylinder (16), wherein air compressor (11) is connected to produce nitrogen with Nitrogen plant (12), the oxygen outlet (111) of air compressor (11), the nitrogen outlet (121) of Nitrogen plant, NO gas cylinder (15) and SO2Gas cylinder (16) converges via pipeline with the steam outlet (131) of water vaporizer (13) and is connected with the mixing tank (21) of gas mixing system (2), and ammonia gas cylinder (14) converges via pipeline with gas mixing system (2) and is connected with reactive system (3).
9. device according to claim 8, it is characterised in that, with ammonia gas cylinder (14), air compressor oxygen outlet (111), Nitrogen plant nitrogen outlet (121), NO gas cylinder (15), SO2The pipeline that the steam outlet (131) of gas cylinder (16) and water vaporizer connects independently arranges mass flowmeter (6).
10. device according to claim 8 or claim 9, it is characterized in that, described gas mixing system also comprises pre-heaters (22), the oxygen outlet (111) of air compressor, the nitrogen outlet (121) of Nitrogen plant, NO gas cylinder (15) and SO2Gas cylinder (16) is connected with described pre-heaters (22) after converging via pipeline with the steam outlet (131) of water vaporizer, then is connected with mixing tank (21).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113358511A (en) * | 2021-05-14 | 2021-09-07 | 华电电力科学研究院有限公司 | Experimental device and method for abrasion resistance of denitration catalyst to dust-containing flue gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113358511A (en) * | 2021-05-14 | 2021-09-07 | 华电电力科学研究院有限公司 | Experimental device and method for abrasion resistance of denitration catalyst to dust-containing flue gas |
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