CN205506776U - Evaluation device of SCR denitration catalyst - Google Patents
Evaluation device of SCR denitration catalyst Download PDFInfo
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- CN205506776U CN205506776U CN201620075303.4U CN201620075303U CN205506776U CN 205506776 U CN205506776 U CN 205506776U CN 201620075303 U CN201620075303 U CN 201620075303U CN 205506776 U CN205506776 U CN 205506776U
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Abstract
The utility model relates to an evaluation device of SCR denitration catalyst can appraise the performance of SCR denitration catalyst under true operating mode. The basic flue gas of device adopts gas boiler or oil fired boiler to produce, be equipped with gas distribution system and flue gas mixing arrangement, can be to evenly allocating NO, NH3, SO2, O2, H2O in the basic flue gas into, be equipped with two segmentation pre -heaters, can preheat the flue gas to 200~550 DEG C, be equipped with the reactor behind the second grade pre -heater, by 2 4 section series connection reaction tube is constituteed, and the interior section size of reaction tube is 5050 mm~150150 mm, and every segment length is 500~1500 mm, and operating temperature is 200~450 DEG C, be equipped with the sampling pipeline for the online analysis of flue gas component concentration, sampling pipeline one end links to each other the other end and online analysis headtotail through ooff valve and the sampling port that lies in every section reaction tube front and back portion, adopt programmable logic controler, through the man -machine interface control function nature component on the control your computer, usage data storehouse all operating parameters of software real -time recording and analysis result.
Description
Technical field
This utility model relates to the evaluating apparatus of a kind of SCR denitration, can be truly in particular to one
The device under operating mode, the reactivity worth of SCR catalyst for denitrating flue gas being evaluated.
Background technology
Nitrogen oxides (NOX) it is one of topmost atmosphere pollution, it can occur with other pollutant in air
Complicated secondary chemical reaction, forms acid rain, photochemical fog and can enter lung fine particle (i.e. PM2.5), having a strong impact on environment
Quality, is detrimental to health.NO in airXMostly being produced by Fossil fuel high-temp combustion process, main source includes firepower
Generating, vehicular emission and boiler waste gas.Chinese NO in 2013XDischarge capacity reaches 2227.4 ten thousand tons, wherein thermal power generation discharge
Amount reaches 8,340,000 tons, accounting 37.4%(coal-fired plant flue gas discharge continuous monitor system As-Is analysis: China Power reduces discharging research
2014, Wang Zhixuan etc. write, Beijing: China Electric Power Publishing House, and 2015, p18), it is NOXThe main source of discharge.Control thermoelectricity
NOXDischarge, is control atmosphere pollution, the emphasis reducing haze weather.
Gating catalytic oxidation reduction (Selective catalytic oxidation, SCR) has that device is simple, removing
Efficiency advantages of higher, is that current coal steam-electric plant smoke removes NOXMain stream approach.SCR method is with ammonia (NH3) it is reducing agent, by urging
Change process is by NOXChange into harmless nitrogen and water.SCR catalyst is generally with titanium dioxide (TiO2) it is carrier, with vanadium oxide
(V2O5) it is main active component, and add WO3Or MoO3Deng auxiliary agent.According to the difference of molding mode, board-like and honeycomb fashion can be divided into
Two classes.Along with power-plant flue gas discharge standard is improved constantly by China, SCR catalyst market is increasingly burning hot, but owing to lacking conjunction
Suitable catalyst reaction device for evaluating performance, catalyst prod difficult quality is protected.
Existing SCR catalyst evaluating apparatus can be divided into microreactor and medium-sized reactor.Microreactor internal diameter is relatively
Little, it is only capable of loading a small amount of that crush or the catalyst sample of powder.Because stream condition and catalyst actual operating mode have relatively
Big difference, on test result impact greatly, the result obtained cannot represent catalyst property under real working condition to test condition
Energy.Existing medium-sized reactor generally can load sectional dimension in the bulk catalyst sample of more than 70*70mm or sectional dimension
For the cell cube catalyst of 150*150mm, stream condition is closer to real working condition, the nitrogen making machine but basis flue gas is generally sampled
The nitrogen simulation occurred.Owing to simulated flue gas is mainly nitrogen, its composition and true flue gas difference are relatively big, and test result can not
Represent catalyst performance under real working condition.
Additionally, existing middle-scale device there is problems.
(1) flue gas flow is difficult to accurately regulate.Generally being provided only with a main flue gas passage, flue gas flow is only capable of by basis
Smoke generating appts carries out manual coarse adjustment, it is impossible to realizes accurately regulation and arranges, and makes the suitability of device greatly reduce, also
The accuracy making test result is affected.
(2) flue gas composition content is difficult to control to.Existing apparatus major part the most manually regulates the flow of flue gas composition and comes
Control the content of flue gas composition, not only waste time and energy, also require that operator have abundant operating experience, add device
Use difficulty, the dependence of artifact also be have impact on the reliability of test result.
(3) reactor seal operation difficulty.The catalyst sample can placed due to middle-scale device is relatively big, for the ease of behaviour
Make, the mode that reactor many employings top/side is opened, it is difficult to ensure that fully seal, dusty gas can be caused to reveal, harm behaviour
Make personal security.Also having partial devices to use cross section to open the mode of flange seal, reactor seals preferably, but handling catalyst
More difficulty.Additionally, due to flue gas has stronger corrosivity, interface gets rusty easily, and affects long term reliability.
(4) automatic control function is lacked, heavy dependence manual operation.SCR catalyst test needs the longer time, existing
Device typically requires a large amount of manual operation to complete the test processs such as Flow-rate adjustment, distribution, analysis, causes testing cost to occupy height not
Under, the reproducibility and reliability of result is also difficult to ensure that.
Summary of the invention
The purpose of this utility model is to provide the evaluating apparatus of a kind of SCR denitration, can overcome prior art
Weak point, is evaluated denitrating catalyst reactivity worth under real working condition.
A kind of evaluating apparatus of SCR denitration, including:
(1) basis flue gas uses gas fired-boiler or oil burning boiler to produce；
(2) it is provided with air distribution system and flue gas mixing arrangement, can uniformly allocate NO, NH in the flue gas of basis3、SO2、O2、H2O；
(3) two-part preheater it is provided with, can be by smoke pre-heating to 200 ~ 550 DEG C；
Being provided with reactor after (4) two grades of preheaters, be made up of 2-4 section cascade reaction pipe, the interior sectional dimension of reaction tube is
50*50 mm ~ 150*150 mm, every segment length is 500 ~ 1500 mm, uses Electric heating heating, and operating temperature is
200 ~ 450 ℃；
(5) being provided with sampling pipeline, for the on-line analysis of flue gas composition concentration, sampling pipeline one end is by switch valve and position
Sample port in every section of reaction tube front and rear part is connected, and the other end is connected with on-line analysis system.
This device is flue gas based on the flue gas that gas fired-boiler or oil burning boiler produce, it is possible to provide catalyst is in true work
Flue gas environment under condition, is the basic condition obtaining catalyst actual response performance.If using the nitrogen that nitrogen gas generator produces
Gas is as analog basis flue gas, and its composition is single, it is impossible to simulate the actual operating mode of catalyst completely, thus test result
Accuracy also can be affected.Smoke of oil-fuel boiler and coal steam-electric plant smoke closest to, be preferred scheme, the fuel used
Include but not limited to gasoline, diesel oil, kerosene, Petroleum etc..As subject to conditions can only use gas fired-boiler time, due to natural gas
Burning produces the water content of flue gas and is higher than coal steam-electric plant smoke, can install dehydrating unit on boiler export flue gas pipeline.This device
Boiler can share with plant produced line or heating system, to reduce operating cost.Only it is used for such as boiler producing basis flue gas,
Then need to be equipped with cooling back installation.Boiler can arrange different burning ranks under normal circumstances, with the flue gas stream that adaptation is different
Amount.When required flue gas flow scope is bigger, it is possible to the boiler of two different capacities of configuration.
It is provided with two-stage preheater, for by smoke pre-heating to 200 ~ 550 DEG C.First order preheater can set as required
Putting before or after distribution and gas mixer, preheater outlet in the second level is directly connected with reactor.
Reactor is in series by 2-4 section reaction tube, and interior sectional dimension is 50*50 mm ~ 150*150 mm, and every section anti-
Answering length of tube is 500 ~ 1500 mm, can load honeycombed catalyst sample, board-like catalyst sample or full-scale honeycomb and urge
Agent cell cube is tested.Reactor uses modular electrical heating, and operating temperature is 200 ~ 450 DEG C, and temperature-control heat couple is put
Among flue gas stream, to ensure the accuracy of reaction temperature.
It is provided with sample port before and after every section of reaction tube and is connected to sample pipeline and on-line analysis system, for flue gas group
Divide the on-line analysis of concentration.One or more in-line analyzers can be selected, such as NO according to the flue gas composition of required analysisX、SO2、O2
Can be analyzed by infrared spectrum analyser Deng constituent content, NH3、H2The constituent contents such as O can be analyzed by laser analyzer.
Analyser also can be provided with multiple passage and be joined directly together from different sampling locations, can realize reactor diverse location flue gas composition dense
The Synchronization Analysis of degree.
Preferably, it is 10 ~ 550 Nm by the flue gas flow of reactor3/h。
It is further preferred that be 50 ~ 350 Nm by the flue gas flow of reactor3/ h, can meet most SCR and urge
The testing requirement of agent.
Preferably, flue gas is out divided into two-way from boiler later, and a road is main road, leads to preheater reactor；Another road
It is bypass, for the outer row of excess flue gas.
It is further preferred that be respectively provided with flow control valve on main flue gas pipeline and gas bypass, by with main flue gas
Effusion meter on pipeline forms control loop and realizes the automatic adjustment of flue gas flow.Use Venturi tube flow under normal circumstances
Meter, is calculated flue gas flow accurately by measuring the pressure reduction of Venturi tube.The position of effusion meter can be arranged on according to demand
Before two grades of preheaters, two grades between preheater and reactor or after reactor.
Preferably, on-line analysis system and air distribution system composition control loop, it is automatically performed NO, NH in flue gas3、SO2、
O2、H2In O, the content of one or more gas components adjusts.Main flue gas pipeline after boiler is provided with air distribution system, is used for adjusting
The content of various gas components in whole flue gas.Mixing arrangement, being sufficiently mixed for flue gas composition it is provided with after air distribution system.Ammonia
Being the form sample introduction by ammonia or ammonia, NO can be provided by gas bomb, it is also possible to is generated by ammoxidation burning.
Preferably, high temperature resistant inert coatings is coated at two-stage preheater and inside reactor, it is to avoid sour gas is at high temperature
React with metal inside under super-humid conditions.
It is further preferred that hold placing graphite pad, close for reaction tube in reactor before and after every section of reaction tube
Envelope.
Preferably, sampling pipeline is provided with electrical heating and heat-insulation layer, the highest can be heated to 350 DEG C, to avoid inorganic salt at pipe
Deposit on wall.
It is further preferred that the switch valve between sampling pipeline and sample port is automatic switch valve, to realize sampling tube
The automatic switchover of line.
Compared with prior art, test device of the present utility model has a following remarkable advantage:
(1) using flue gas based on the true flue gas of combustion process generation, test condition is completely the same with real working condition,
Test result is the most accurate；
(2) gas bypass can be used to design, coordinate automatic regulating valve, it is achieved in working range, any flue gas flow is accurate
Quickly regulation；
(3) Graphite pad hydraulic packing can be used to design, reactor good seal, catalyst disassembling section is easy, reliably
Property is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of SCR denitration evaluating apparatus of the present utility model.
In figure: 1-oil and gas boiler；2a-by-pass adjustable valve；2b-main road flow control valve；3-one-level preheats
Device；4-air distribution system；5-mixing arrangement；6-effusion meter；Bis-grades of preheaters of 7-；8-thief hatch；9-reactor；10-samples pipeline；
11-on-line analysis system；12-exhaust pump；13-switch valve；14-reaction tube.
Detailed description of the invention
Embodiment 1
A kind of SCR denitration evaluating apparatus of the present utility model, flow process is as shown in Figure 1.Oil burning boiler (1) is used to make
Based on smoke generating appts, be furnished with two-stage preheater (3,7) and two section reactor (9).The inside of every section of reaction tube (14)
A size of 150*150*1500 mm, uses Graphite pad to seal before and after reaction tube (14), front portion, middle part, rear portion are equipped with sampling
Pipeline (10) is connected with on-line analysis system (11), and flue gas flow is measured by effusion meter (6), and bypasses with boiler (1) outlet
Flow control valve (2a) and reactor (9) export pipeline on flow control valve (2b) constitute control loop, automatically adjust warp
Cross the flue gas flow of reactor (9).
Embodiment 2
A kind of SCR catalyst evaluating apparatus of the present utility model, use as different from Example 1 natural gas fired incinerators and
Water trap replaces oil burning boiler (1).
Embodiment 3
A kind of SCR catalyst evaluating apparatus of the present utility model, does not wraps on boiler export pipeline as different from Example 1
Containing gas bypass pipeline and regulation valve (2a), do not possesses flue gas flow automatic regulating function.
Embodiment 4
A kind of SCR catalyst evaluating apparatus of the present utility model, the valve on pipeline (10) of sampling as different from Example 1
Door (13) is automatic switch valve.
Embodiment 5
A kind of SCR catalyst evaluating apparatus of the present utility model, the valve on pipeline (10) of sampling as different from Example 1
Door (13) is automatic switch valve.Air distribution system (4) is formed with on-line analysis system (11) and controls loop.
Embodiment 6
A kind of SCR catalyst evaluating apparatus of the present utility model, the valve on pipeline (10) of sampling as different from Example 1
Door (13) is automatic switch valve.Air distribution system (4) is formed with on-line analysis system (11) and controls loop；Device configuration is independent hard
Part security system and automatically perform system.
Embodiment 7
A kind of SCR catalyst evaluating apparatus of the present utility model, flow process sees Fig. 1, except that reaction tube (9) is interior
Portion a size of 70*70*750 mm.
Comparative example 1
Small-sized SCR catalyst evaluating apparatus, reactor (9) is single hop tubulose, internal diameter 4 cm, and catalyst volume 50 ml makes
With flange seal, basis flue gas uses nitrogen simulation.
Comparative example 2
Medium-sized SCR catalyst evaluating apparatus, is provided with two-part reaction tube (14), and every section of reaction tube (14) inside dimension is
150*150*1500 mm, reactor (9) basis flue gas uses nitrogen simulation.
Embodiment 8
Sample is filled, in phase after the honeycomb-shaped SCR catalyst of same batch being pressed the cutting of said apparatus reactor size or crushing
Same reaction temperature and SO2、NO、O2Testing under concentration, flue gas flow rate sets according to the optimal conditions of each equipment.
Test condition:
Reaction temperature: 385 DEG C
NO concentration: 400 vpm (standard dry state)
SO2Concentration: 500 vpm(standard dry states)
O2Content: 5.0%
Denitration efficiency and SO2/SO3The computational methods of conversion ratio:
Denitration efficiency %=(C1 - C2)/C2 × 100
SO2/SO3Conversion ratio %=(S3o - S3i)/S2i × 100
C1: reactor inlet NO* concentration
C2: reactor outlet NO* concentration
S3o: reactor outlet SO3Concentration
S3i: reactor inlet SO3Concentration
S2i: reactor inlet SO2Concentration
Equilibration time: start distribution to gas component and reach setting value required time.
Testing time: after preheater and reactor reach design temperature, start distribution to completing burn-in test all processes
Required time.
Denitration efficiency and SO2/SO3Conversion ratio is the meansigma methods of continuous three test results after stable reaction.
As can be seen from the above results, the actual measurement of the test result of this utility model device and factory closest to, and lead to
Cross the Automated condtrol to testing process, also can save significantly on equilibration time and distribution time.And small-sized micro-reactor (comparative example
1) and employ nitrogen as into analog basis flue gas middle-scale device (comparative example 2) test value deviation measured value more.Additionally, it is and little
Type device cannot be passed through SO simultaneously2, it is impossible to measure SO simultaneously2/SO3Conversion ratio.
Claims (10)
1. the evaluating apparatus of a SCR denitration, it is characterised in that including:
(1) basis flue gas uses gas fired-boiler or oil burning boiler (1) to produce；
(2) it is provided with air distribution system (4) and flue gas mixing arrangement (5), can uniformly allocate NO, NH in the flue gas of basis3、SO2、O2、
H2O；
(3) two-stage preheater (3,7) it is provided with, can be by smoke pre-heating to 200 ~ 550 DEG C；
It is provided with reactor (9) after (4) two grades of preheaters (7), is made up of 2-4 section cascade reaction pipe (14), reaction tube (14) interior
Sectional dimension is 50*50 mm ~ 150*150 mm, and every segment length is 500 ~ 1500 mm, uses Electric heating heating, work
It it is 200 ~ 450 DEG C as temperature；
(5) being provided with sampling pipeline (10), for the on-line analysis of flue gas composition concentration, sampling pipeline (10) one end is by switch
Valve (13) is connected with the sample port (8) being positioned at every section of reaction tube (14) front and rear part, and the other end is with on-line analysis system (11) even
Connect.
The evaluating apparatus of SCR denitration the most according to claim 1, it is characterised in that by the cigarette of reactor (9)
Throughput is 10 ~ 550 Nm3/h。
The evaluating apparatus of SCR denitration the most according to claim 2, it is characterised in that by the cigarette of reactor (9)
Throughput is 50 ~ 350 Nm3/h。
The evaluating apparatus of SCR denitration the most according to claim 1, it is characterised in that flue gas is from boiler (1) out
Be divided into two-way, a road is main road later, leads to preheater (3,7) and reactor (9)；Another road is bypass, for excess flue gas
Outer row.
The evaluating apparatus of SCR denitration the most according to claim 4, it is characterised in that: on gas bypass and main road
It is respectively equipped with flow control valve (2a) and (2b), and forms control loop with the flow measurement device (6) on flue gas main road, automatically
Flue gas flow is adjusted.
The evaluating apparatus of SCR denitration the most according to claim 1, it is characterised in that on-line analysis system (11)
Formed with air distribution system (4) and control loop, automatically to NO, NH in flue gas3、SO2、O2、H2One or more gas components in O
Content is adjusted.
The evaluating apparatus of SCR denitration the most according to claim 1, it is characterised in that two-stage preheater (3,7) and
Reactor (9) inwall is with the high temperature resistant inert coatings not reacted with sour gas.
The evaluating apparatus of SCR denitration the most according to claim 1, it is characterised in that in reactor (9) every section anti-
Placing graphite pad is held, for the sealing of reaction tube (14) before and after should managing (14).
The evaluating apparatus of SCR denitration the most according to claim 1, it is characterised in that sampling pipeline (10) is provided with
Electrical heating and heat-insulation layer, the highest can be heated to 350 DEG C.
The evaluating apparatus of SCR denitration the most according to claim 1, it is characterised in that sample pipeline (10) and adopt
Switch valve (13) between sample port (8) is automatic switch valve.
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| CN201620075303.4U CN205506776U (en) | 2016-01-26 | 2016-01-26 | Evaluation device of SCR denitration catalyst |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404984A (en) * | 2016-08-27 | 2017-02-15 | 华电电力科学研究院 | Equal-length middle-sized flue gas denitrification catalyst performance detection device and detection method |
| CN106908565A (en) * | 2017-01-13 | 2017-06-30 | 武汉都市环保工程技术股份有限公司 | A kind of SCR catalyst performance test methods |
| CN106932526A (en) * | 2017-04-12 | 2017-07-07 | 华能国际电力股份有限公司 | One kind is used for denitrating catalyst cryogenic property characterization processes and device |
| CN109738572A (en) * | 2018-12-25 | 2019-05-10 | 兰州金润宏成石油化工科技有限公司 | A kind of catalyst performance evaluation device and evaluation method |
-
2016
- 2016-01-26 CN CN201620075303.4U patent/CN205506776U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404984A (en) * | 2016-08-27 | 2017-02-15 | 华电电力科学研究院 | Equal-length middle-sized flue gas denitrification catalyst performance detection device and detection method |
| CN106404984B (en) * | 2016-08-27 | 2018-09-11 | 华电电力科学研究院 | The isometric medium-sized catalyst for denitrating flue gas device for detecting performance of one kind and detection method |
| CN106908565A (en) * | 2017-01-13 | 2017-06-30 | 武汉都市环保工程技术股份有限公司 | A kind of SCR catalyst performance test methods |
| CN106932526A (en) * | 2017-04-12 | 2017-07-07 | 华能国际电力股份有限公司 | One kind is used for denitrating catalyst cryogenic property characterization processes and device |
| CN109738572A (en) * | 2018-12-25 | 2019-05-10 | 兰州金润宏成石油化工科技有限公司 | A kind of catalyst performance evaluation device and evaluation method |
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