CN109799314A - A kind of catalyst activity evaluating apparatus and method - Google Patents
A kind of catalyst activity evaluating apparatus and method Download PDFInfo
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- CN109799314A CN109799314A CN201910225612.3A CN201910225612A CN109799314A CN 109799314 A CN109799314 A CN 109799314A CN 201910225612 A CN201910225612 A CN 201910225612A CN 109799314 A CN109799314 A CN 109799314A
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Abstract
The present invention provides a kind of catalyst activity evaluating apparatus and method, including is made of evaporation element, catalyst unit, sample unit, tail gas disposal unit；By HCB as dioxin Substitute Indexes object; it is reacted with catalyst; the catalytic degradation efficiency of the HCB under condition of different temperatures, different void tower flow conditions can be simulated; there are corresponding relationships between the catalytic degradation efficiency A of HCB and the catalytic degradation effect B of dioxin; and B=A*95%; the apparatus structure is simple, and substitutes the higher dioxin of toxicity using the lower HCB of toxicity, and the safety of experimenter can be effectively protected.
Description
Technical field
The invention belongs to evaluating catalyst field, the evaluation of especially a kind of catalyst for catalytic degradation dioxin is filled
It sets and method.
Background technique
The removal technique of dioxin is to be removed by cloth bag and active carbon absorption technology, but the technique is only in traditional flue gas
It is that the dioxin in flue gas is transformed into solid-state flying dust, there is no eliminate dioxin.Thus catalytic degradation technique generates, with
V2O5/WO3-TiO2、V2O5/MoO3-TiO2Catalyst are waited, the dioxin in the flue gas that can degrade, two dislike in catalytic reaction process
English is by exhaustive oxidation, final product H2O、CO2 And HCl.New technology of the technology as catalytic degradation dioxin, gradually obtains
Industrial application.
Dioxin is a kind of persistence organic pollutant, the concentration in flue gas be it is lower, at present China to waste incineration,
Dioxin concentration discharge value in the various fields incineration flue gas such as dangerous waste incineration, sintering flue gas has emission limit requirement.
Since the acquisition of the sample of dioxin is more demanding, while the lab analysis process of dioxin is complicated, and the period is longer, analysis two
A large amount of human and material resources and financial resources will be spent by disliking English sample.Due to the hypertoxicity and difficult volatility of dioxin, at present in lab scale
Stage directlys adopt the gas containing dioxin there are no method or dioxin calibrating gas carries out catalysis degeneration experiment.If
Pilot scale or industrial application stage evaluate the efficiency of catalyst degradation dioxin, then spend a large amount of cost of human and material resources,
The research and development for being unfavorable for catalysis are carried out.
If can evaluate catalyst when lab scale to the degradation effect of dioxin, then can timely adjust
The formula of whole catalyst is the target that everybody studies at present.And in lab scale using the lower substitute of toxicity come simulated target
Catalyst is that evaluation goal catalyst has a kind of methods and techniques of degrading activity to become dioxin to the degradation efficiency of dioxin
Gesture.
Summary of the invention
The present invention provides a kind of catalyst activity evaluating apparatus and method, which can be used in evaluating catalyst
To the degradation efficiency of dioxin.
To achieve the purpose of the present invention, using following technical scheme:
A kind of catalyst activity evaluating apparatus and method, comprising: evaporation element, catalyst unit, sample unit, tail gas disposal unit
Composition.
Whole device pipeline influences this hair using 316 stainless steel makings of interior polishing to prevent HCB to be adsorbed in pipeline
The reliability and stability of the data of bright device.
All pipelines have heating tape on device, and are wrapped up with thermal insulation materials such as asbestos, to guarantee the temperature in pipeline
Controllably, it prevents the gas in pipeline from condensing, influences the data reliability of device.
Pipeline is equipped with check-valves, exhaust-valve in needed positions such as elbow, tieing, to guarantee that management has safety.
(1) evaporation element, the evaporation element include that gas generator 1, standard specimen 2, heater 3, carrier gas 4, gas are mixed
Clutch 5 forms.
Above-mentioned (1) evaporation element is HCB standard sample in standard specimen 2, fixed into gas generator 1 by micro-injection pump
Amount generates HCB liquid, controls temperature by heater 3, gasifies in gas generator 1；
Above-mentioned (1) evaporation element is N in carrier gas 42Bottle and O2Gas cylinder, N2And O2After being mixed in mixer 5, with gas generator
The HCB to gasify in 1 enters catalyst unit together, by adjusting N2And O2Yield and flow velocity control the concentration of HCB gas.
(2) catalyst unit, the catalyst unit include catalytic reactor 6, temperature controller 7.
What is held in catalytic reactor 6 in above-mentioned (2) catalyst unit is catalyst to be evaluated；
The HCB gas generated among above-mentioned (1) evaporation element is in N2And O2Protection under, into catalytic reactor 6 with to
The catalyst of evaluation reacts；
Temperature in catalytic reactor 6 is controlled by temperature controller 7 in catalytic reactor 6 in above-mentioned (2) catalyst unit, constantly
The optimal temperature conditions for testing out HCB gas and catalyst to be evaluated reacts.
(3) sample unit, the sample unit include adsorbent equipment 8.
In above-mentioned (2) catalyst unit after anti-raw catalysis reaction, unreacted HCB gas enter adsorbent equipment 8 it
Before, measuring HCB concentration in gas is A1, and unreacted HCB gas is in entering adsorbent equipment 8, the XAD2 that is adsorbed in device 8
Resin adsorption measures the concentration A2 of HCB in gas, surveys catalytic degradation efficiency A=(A1-A2)/A1% of HCB after absorption.
(4) Tail gas cleanup unit, the Tail gas cleanup unit packet grade one filter (9), secondary filter (10).
Above-mentioned (4) Tail gas cleanup unit is for handling gas remaining in above-mentioned (3), by grade one filter 9 and second level
The normal hexane and active carbon of filtering 10, purified gas direct emission adsorb the normal hexane and active carbon saturation of residual gas
It is handled afterwards as dangerous substance.
Prove exist between the catalytic degradation efficiency A of HCB and the catalytic degradation efficiency B of dioxin through a large number of experiments
Corresponding relationship, and B=A*95%.The catalyst activity evaluating apparatus and method do not need experimenter and touch the evil of Poisons two
English, energy assay go out catalyst to the catalytic degradation effect of dioxin, and device is simple, easy to operate.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without any creative labor, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of catalyst activity evaluating apparatus and method schematic diagram that present embodiment provides.
Specific embodiment
Concrete operation step:
(1) a certain amount of HCB solid etalon sample is put into gas generator 1, by controlling the temperature of heater 3,
Under the conditions of corresponding temperature, gasify after HCB solid etalon sample gas solid phase partition equilibrium, the N in carrier gas 42And O2Under cooperation,
It is blown into the catalytic reactor 6 in catalyst unit.
(2) N in carrier gas 4 in above-mentioned (1)2And O2Gas flow optimized in a certain range.
(3) size of catalytic reactor 6 is 20*300mm in above-mentioned (1), is made of quartz ampoule, temperature controller is by heating
Band and heating furnace composition；Catalyst granules and silica wool composition catalyst bed to be evaluated are placed in catalytic reactor 6.Pass through
Temperature controller 7 controls the temperature range of catalytic reactor 6 at 80-400 DEG C.
(4) HCB gas and the HCB after catalyst generation catalytic degradation reaction to be evaluated, not being degraded in above-mentioned (3)
Gas enters in adsorbent equipment 8, is adsorbed the XAD2 resin adsorption placed in device 8, brings XAD2 resin into laboratory and carries out
HCB content is analyzed, the catalytic degradation efficiency A of HCB is calculated.
(5) gas generated in above-mentioned (1)-(4), is not adsorbed reaction, eventually by grade one filter 9 and second level
It is discharged after the normal hexane and activated carbon adsorption filtration, purification of filtering 10.
(6) between the catalytic degradation efficiency A of HCB and the catalytic degradation effect B of dioxin there are corresponding relationship, and B=A*
95%。
Device stability test
(1) air tightness test: after whole device closing, being forced into 0.6Mpa, kept for 48 hours, and the variation of whole device pressure difference is little
In 0.15Mpa.
(2) temperature controller: heater 3 and temperature controller can maintain set range of temperature on 3 DEG C
Under.
(3) stability test takes three groups of 20ug/L, 40ug/L, 100ug/L as a result, using HCB as target contaminant respectively
HCB concentration value carry out rate of recovery test experiments, every group test 3 times, test 30min.
The results are shown in Table 1:
Table 1
| Serial number | The rate of recovery 1 | The rate of recovery 2 | The rate of recovery 3 | Average recovery rate |
| 1 | 87.5 | 89.6 | 88.4 | 88.5 |
| 2 | 90.2 | 89.6 | 88.6 | 89.5 |
| 3 | 87.4 | 88.2 | 87.9 | 87.8 |
It is above-mentioned statistics indicate that the rate of recovery is within controlled range.
Application case 1
A type catalyst is verified to the catalytic degradation efficiency of dioxin, 6 gas flow rate of catalytic reactor is set as 5000h-1, verifies
Condition of different temperatures is to A type catalyst efficiency.
Pass through N in control carrier gas 42And O2Air-flow in 300ml/min, allow into gas before catalytic reactor 6
HCB concentration is 20ppm, takes 200mg A type catalyst to be put into catalytic reactor 6, air velocity is set as 5000h-1, entirely
Duration of the reaction is 2h, and verifying condition of different temperatures samples lab analysis to A type catalyst degradation efficiency.
Experimental result is as shown in table 2:
Table 2
| Serial number | Temperature DEG C | HCB removal rate % | Convert dioxin removal rate % |
| 1 | 150 | 97.2 | 92.3% |
| 2 | 180 | 99.3 | 94.3% |
| 3 | 220 | 98.2 | 93.3% |
When the above results show 180 DEG C, A type catalyst is to HCB(dioxin) degradation efficiency is best.
6 temperature of catalytic reactor is set as 180 DEG C, verifies gas with various flow conditions to A type catalyst efficiency.
Pass through N in control carrier gas 42And O2Air-flow in 300ml/min, allow into gas before catalytic reactor 6
HCB concentration is 20ppm, and 200mg A type catalyst is taken to be put into catalytic reactor 6, and entire duration of the reaction is 2h, and sampling is real
Test room analysis.
Experimental result is as shown in table 3:
Table 3
| Serial number | Air velocity | HCB removal rate % | Convert dioxin removal rate % |
| 1 | 5000h-1 | 99.1 | 94.1% |
| 2 | 8000h-1 | 99.3 | 94.3% |
| 3 | 15000h-1 | 98.6 | 93.7% |
By the test of temperature and air velocity, A type catalyst is to HCB(dioxin) the condition of best catalytic degradation effect be
180 DEG C, air velocity 8000h-1.
Application case 2
Verifying Type B catalyst is tested, and experimental procedure is as case 1.
Air velocity is set as 5000h-1, and Type B catalyst is to HCB(dioxin under condition of different temperatures) degradation rate knot
Fruit is as shown in table 4:
Table 4
| Serial number | Temperature DEG C | HCB removal rate % | Convert dioxin removal rate % |
| 1 | 150 | 98.2 | 93.3% |
| 2 | 180 | 98.6 | 93.7% |
| 3 | 220 | 99.3 | 94.3% |
Temperature is set as 220 DEG C, and Type B catalyst is to HCB(dioxin under different air velocities) degradation results such as 5 institute of table
Show:
Table 5
| Serial number | Air velocity | HCB removal rate % | Convert dioxin removal rate % |
| 1 | 5000h-1 | 98.4 | 93.5% |
| 2 | 8000h-1 | 99.6 | 94.6% |
| 3 | 15000h-1 | 97.7 | 92.8% |
By the test of temperature and air velocity, Type B catalyst is to HCB(dioxin) the condition of best catalytic degradation effect be
220 DEG C, air velocity 8000h-1.
Claims (9)
1. a kind of catalyst activity evaluating apparatus and method, which is characterized in that the device includes: evaporation element, catalysis list
Member, sample unit, tail gas disposal unit composition, for evaluating catalyst to the catalytic degradation efficiency of dioxin；
Evaporation element, the evaporation element include that gas generator (1), standard specimen (2), heater (3), carrier gas (4), gas are mixed
Clutch (5)；
Catalyst unit, the catalyst unit include catalytic reactor (6), temperature controller (7)；
Sample unit, the sample unit include adsorbent equipment (8)；
Tail gas cleanup unit, the Tail gas cleanup unit packet grade one filter (9), secondary filter (10).
2. catalyst activity evaluating apparatus according to claim 1 and method, which is characterized in that standard specimen (2) is using micro
Syringe or pump, calibrated shot go out HCB, and carrier gas is by N in (4)2With 02Tank composition, the middle placement of catalytic reactor (6) are to be evaluated
Catalyst.
3. according to claim 1, catalyst activity evaluating apparatus and method described in 2, which is characterized in that the evaporation element
It is, by the purging of carrier gas (4), to generate stable, low concentration gaseous state HCB gas after the HCB gasification for standard specimen (2) calibrated shot
Body, which enters, carries out catalytic degradation reaction in catalyst unit.
4. catalyst activity evaluating apparatus according to claim 3 and method, which is characterized in that pass through the N in carrier gas (4)2
With 02Void tower flow velocity in the concentration and flow velocity and catalytic reactor (6) of occurrence quantity and gas flow rate to adjust HCB.
5. according to claim 1, catalyst activity evaluating apparatus and method described in 3, which is characterized in that in adsorbent equipment (8)
For XAD2 resin etc., the HCB in the gas of uncatalyzed reaction is adsorbed.
6. according to claim 1, catalyst activity evaluating apparatus and method described in 5, which is characterized in that in adsorbent equipment (8)
Unadsorbed complete residual gas enters the grade one filter in Tail gas cleanup unit (9), secondary filter (10) carries out at purification
It manages, is discharged after tail gas clean-up.
7. according to claim 1, catalyst activity evaluating apparatus and method described in 6, which is characterized in that grade one filter (9)
Middle placement is that active carbon is placed in (10) in normal hexane, secondary filter.
8. catalyst activity evaluating apparatus and method described in -7 according to claim 1, which is characterized in that injection in standard specimen (2)
The gasification of HCB standard sample after catalytic degradation reaction, catalytic degradation efficiency occurs with catalyst to be evaluated in catalyst unit
For A, catalyst degradation dioxin catalytic degradation efficiency is that relevance, and B=A*95% is presented in B, A and B.
9. catalyst activity evaluating apparatus and method described in -8 according to claim 1, which is characterized in that in device pipeline uses
The stainless steel making in the 316 of polishing, all pipelines have heating tape on device, to guarantee the temperature-controllable in pipeline.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111579708A (en) * | 2020-05-19 | 2020-08-25 | 福州大学 | Device and method for evaluating activity of desulfurization catalyst |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111579708A (en) * | 2020-05-19 | 2020-08-25 | 福州大学 | Device and method for evaluating activity of desulfurization catalyst |
| CN111579708B (en) * | 2020-05-19 | 2021-12-24 | 福州大学 | Device and method for evaluating activity of desulfurization catalyst |
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