CN115656404A - Catalytic combustion easily polymerizes class VOCs's catalyst performance detection device - Google Patents
Catalytic combustion easily polymerizes class VOCs's catalyst performance detection device Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 52
- 239000003054 catalyst Substances 0.000 title claims abstract description 49
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 25
- 238000007084 catalytic combustion reaction Methods 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 46
- 238000006243 chemical reaction Methods 0.000 claims abstract description 40
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 26
- 238000010926 purge Methods 0.000 claims abstract description 25
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 9
- 238000002347 injection Methods 0.000 claims description 31
- 239000007924 injection Substances 0.000 claims description 31
- 238000012545 processing Methods 0.000 claims description 18
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims 1
- 238000002309 gasification Methods 0.000 abstract description 17
- 238000002156 mixing Methods 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 107
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 56
- 238000012360 testing method Methods 0.000 description 36
- 239000006200 vaporizer Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 17
- 239000000523 sample Substances 0.000 description 15
- 239000000126 substance Substances 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 11
- 230000008569 process Effects 0.000 description 9
- 230000005587 bubbling Effects 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 6
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 229910001873 dinitrogen Inorganic materials 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention relates to a catalyst performance detection device for catalytic combustion of easily polymerizable VOCs, which comprises: a front end gas inlet part, a reaction part, a gas switching treatment part, a tail end detection part and a purging part; the front end gas inlet part is used for feeding an easily polymerizable reagent into the reaction part for treatment; the reaction part is used for reacting the catalyst with the easily polymerizable reagent and controlling the reaction temperature; the gas switching treatment part is used for treating the easily polymerized reagent after reaction and controlling the flow rate of the entering gas; the tail end detection part is used for detecting the tail gas emitted by the gas switching treatment part; the purging part is used for treating residual gas in the device; wherein the front end gas inlet part, the reaction part, the gas switching treatment part, the tail end detection part and the purging part are sequentially connected. The invention has scientific, reasonable and safe design, directly injects the reagent into the heating furnace through the front-end injector, and reacts through the catalyst along with the uniform mixing and gasification of air, thereby preventing the high-temperature polymerization of easily polymerized organic matters from blocking the inner pipeline of the instrument.
Description
Technical Field
The invention relates to the technical field of catalytic combustion performance evaluation of catalysts, in particular to a catalyst performance detection device for catalytic combustion easily-polymerized VOCs.
Background
The catalyst is an indispensable important component in the chemical industry, has high activity, high selectivity, convenient operation and long service cycle, plays an important role in reducing the consumption of raw materials and energy, improving the productivity of equipment, improving the quality of products, reducing three wastes, preventing environmental pollution and the like, and brings great economic benefit and social benefit. The catalyst performance evaluation device can quickly, accurately and simply know the performance of the catalyst so as to ensure high activity and high stability in subsequent use.
The existing catalyst performance evaluation device adopts a bubbling method or injects a reagent into a vaporizer by using an injection pump for gasification and then introduces the reagent into a heating furnace for reaction, when an easily polymerized substance is tested, the reagent is easily polymerized on the inner wall of an injection pipeline of the vaporizer after high-temperature gasification to cause blockage, the test cannot be completed, the gasification temperature of the vaporizer for general experiments is not higher than 180 ℃, partial substances cannot be completely gasified and can be accumulated in the vaporizer, a large amount of residues are caused, and the problem that the vaporizer is blocked seriously is also caused. The direct injection method directly injects the reagent into the upper part of the heating furnace through the injection pump, and the reagent is uniformly gasified in the heating furnace under the driving of air, so that the use of a vaporizer and a small injection pipeline is reduced, and the blockage condition is avoided.
The existing catalyst performance evaluation device directly leads the reacted tail gas into the detection equipment, for some easily polymerized chemical substances, the chemical substances are easily polymerized and adsorbed in a gas pipe and adsorbed on a sample inlet or a sample inlet filter cotton of a detection instrument in the process of entering the detection equipment through the gas pipe, long-time high-concentration detection can cause certain influence on a test result under the condition of low-concentration detection, and particularly great influence is caused on a high-requirement and high-activity catalyst test result.
Disclosure of Invention
The invention aims to solve the problem that an easily polymerizable substance is easy to polymerize and cause blockage in the gasification process, an easily polymerizable reagent is directly injected into a heating furnace by using an injection pump for gasification, the condition that a pipeline is blocked in the gasification process is avoided, the tail gas after reaction is directly introduced into detection equipment by using the conventional catalyst performance evaluation device, and for some easily polymerizable chemical substances, the easily polymerizable chemical substances are easy to polymerize and adsorb in a gas pipe and on a sample inlet or a sample inlet filter cotton of a detection instrument in the process of entering the detection equipment through the gas pipe, long-time high-concentration detection can cause certain influence on a test result under the condition of low-concentration detection, particularly great influence on a catalyst test result with high requirement and high activity.
In order to achieve the purpose, the invention provides the following scheme:
a catalytic combustion easy polymerization class VOCs's catalyst performance detection device includes:
a front end gas inlet part, a reaction part, a gas switching treatment part, a tail end detection part and a purging part;
the front end gas inlet part is used for feeding an easy-to-polymerize reagent into the reaction part;
the reaction part is used for reacting a catalyst with the easily polymerizable reagent and controlling the reaction temperature;
the gas switching processing part is used for processing the easily polymerized reagent after reaction and controlling the flow rate of the inlet gas;
the tail end detection part is used for detecting the tail gas emitted by the gas switching treatment part;
the purging part is used for processing residual gas in the device;
wherein the front end gas inlet part, the reaction part, the gas switching treatment part, the tail end detection part and the purging part are connected in sequence.
Preferably, the front end air inlet part comprises an air compression device, a mass flow meter and an injection pump, the air compression device is connected with the mass flow meter, and the injection pump and the mass flow meter are respectively connected with the reaction part through a first pipeline.
Preferably, the reaction part comprises a heating device, a plurality of temperature control devices and a catalyst placing device, the catalyst placing device is fixedly placed inside the heating device, part of the temperature control device extends into the heating device, the heating device is respectively connected with the injection pump and the mass flow meter through the first pipeline, and the heating device is connected with the gas switching processing part through the second pipeline.
Preferably, gaseous switching processing portion includes tail gas processing unit and gaseous appearance switching unit that advances, tail gas processing unit through first three-way valve respectively with the second pipeline with gaseous appearance switching unit connects, firing equipment passes through the second pipeline with gaseous appearance switching unit connects.
Preferably, the gas sampling switching unit comprises a first electromagnetic valve, a second electromagnetic valve, a first rotameter and a second rotameter, the first three-way valve is connected with the second pipeline and the first electromagnetic valve respectively, the first electromagnetic valve is connected with the first rotameter, one end of the second electromagnetic valve is connected with the second rotameter, the other end of the second electromagnetic valve is connected with the purging part, and the first rotameter and the second rotameter are connected with the terminal detection part through the second three-way valve.
Preferably, the tail gas treatment unit adopts a tail gas alkali washing device.
Preferably, the purge portion contains a high purity gas.
Preferably, the end detecting section includes a gas phase analyzing device connected to the second three-way valve through a third pipeline.
The invention has the beneficial effects that:
(1) According to the invention, the vaporizer part is removed, the easily polymerizable reagent is directly injected above the heating furnace by using the injection pump and enters the heating furnace for high-temperature gasification under the drive of air, so that the condition of polymerization blockage caused by injecting the easily polymerizable reagent into the vaporizer for gasification is avoided;
(2) The tail gas treatment device is additionally arranged, most of the tail gas after reaction is introduced into the alkali washing device for absorption treatment, so that the environmental pollution is avoided;
(3) The invention is provided with the purging device at the tail end of the gas chromatograph, and the high-purity nitrogen is used for purging the pipeline introduced into the gas chromatograph, so that the tail gas is reduced to remain in the gas pipe and the gas chromatograph, the influence on the subsequent experiment is reduced, the accuracy of the experiment is ensured, and the reliability of the evaluation test of the catalyst performance is further improved;
(4) The invention carries out dynamic on-line detection on the temperature, gas flow, time reaction parameters, tail gas components and the like of the catalytic combustion reaction, and reduces the error and instability of manual detection of personnel; according to the invention, the gas purging switching realizes the gas circuit switching by opening and closing the one-way solenoid valve, so that the leakage caused by manual replacement of a gas pipe by a tester is reduced, and the damage caused by suction of the tester is avoided; the whole experimental device is simple to operate and is suitable for various testing requirements.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a device for detecting the performance of a catalyst for catalytic combustion of easily polymerizable VOCs according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the FID test results of testing the bypass concentration variation of the prior art syringe pump + vaporizer combination device in accordance with an embodiment of the present invention;
FIG. 3 is a graph showing the FID detection of the bypass concentration change using the bubbling method test apparatus according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of FID detection results of bypass concentration changes of a direct injection gasification test apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of FID detection results of performance detection of VOCs catalytic oxidation Volatile Organic Compounds (VOCs) by using the apparatus of the present invention in the embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating the detection results of purging the pipeline and the gas chromatograph according to an embodiment of the present invention;
the system comprises a pump 1, a heating furnace 2, a catalyst 3, a front-end temperature control probe 4, a rear-end temperature control probe 5, an alkaline cleaning device 6, a first three-way valve 7, a first electromagnetic valve 8, a first rotor flowmeter 9, a second three-way valve 10, a gas chromatograph 11, a second electromagnetic valve 12, a second rotor flowmeter 13, high-purity nitrogen 14, a heating belt 15, an air compressor 16 and a mass flowmeter 17.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the present invention provides a device for detecting the performance of a catalyst for catalytic combustion of easily polymerizable VOCs, comprising:
a front end gas inlet part, a reaction part, a gas switching treatment part, a tail end detection part and a purging part;
the front end gas inlet part is used for feeding an easily-polymerized reagent into the reaction part;
the reaction part is used for reacting a catalyst with the easily polymerizable reagent and controlling the reaction temperature;
the gas switching processing part is used for processing the easily polymerized reagent after reaction and controlling the flow of the entering gas;
the tail end detection part is used for detecting the tail gas emitted by the tail gas treatment unit;
the purging part is used for treating residual gas in the device;
wherein the front end gas inlet part, the reaction part, the gas switching treatment part, the tail end detection part and the purging part are connected in sequence.
The front end air inlet part comprises an air compression device, a mass flow meter and an injection pump, the air compression device is connected with the mass flow meter, and the injection pump and the mass flow meter are respectively connected with the reaction part through first pipelines.
The reaction part comprises a heating device, a plurality of temperature control devices and a catalyst placing device, the catalyst placing device is fixedly placed inside the heating device, the temperature control device extends into the heating device, the heating device is respectively connected with the injection pump and the mass flow meter through the first pipeline, and the heating device is connected with the gas switching processing part through the second pipeline.
The gas switching processing part comprises a tail gas processing unit and a gas sample introduction switching unit, wherein the tail gas processing unit is respectively connected with the second pipeline and the gas sample introduction switching unit through a first three-way valve, and the heating equipment is connected with the gas sample introduction switching unit through the second pipeline.
The gas sampling switching unit comprises a first electromagnetic valve, a second electromagnetic valve, a first rotameter and a second rotameter, the first three-way valve is respectively connected with the second pipeline and the first electromagnetic valve, the first electromagnetic valve is connected with the first rotameter, one end of the second electromagnetic valve is connected with the second rotameter, the other end of the second electromagnetic valve is connected with the purging part, and the first rotameter and the second rotameter are connected with the tail end detection part through the second three-way valve.
For better description, styrene is taken as an example of the easily polymerizable organic substance in this example.
Compared with the prior art, the invention has the first advantage that the reagent is directly injected into the heating furnace through the injector for direct gasification, thereby reducing the use of a vaporizer and avoiding the condition that the reagent cannot be injected because easily-polymerized substances are polymerized and block the vaporizer pipeline in the high-temperature heating process. Compare in prior art, the second advantage lies in that the device can switch into gas chromatograph's gas with cross control solenoid valve, the long-time letting in of low temperature section high concentration tail gas easily remains in pipeline and gas chromatograph, test low concentration tail gas and lead to certain influence to follow-up high temperature section, let in gas chromatograph through switching high-purity nitrogen gas, utilize high-purity nitrogen gas to sweep pipeline and gas chromatograph, will remain the tail gas and sweep totally and test again, experimental error has been reduced, the accuracy of test data has been improved, test data's reliability has further been promoted. And the switching process is completed through the switch electromagnetic valve, so that gas leakage caused by manual switching of pipelines by testers is avoided, and the safety of the testers can be guaranteed.
The prior syringe pump plus vaporizer combination was tested for bypass concentration change with the test substrate exemplified by styrene. The amount of styrene injected by the injection pump is 80ul/min, the temperature of the vaporizer is set to 155 ℃, the temperature is about 10 ℃ higher than the boiling point temperature (145.2) of the styrene, the flow rate of the mass flow meter is 8.8L/min, and the volume space velocity is 15000h -1 Styrene concentration of 5000mg/m 3 (ii) a Heating and heat preservation are adopted for all gas pipelines in the equipment by heating belts; the bypass outlet of the device is connected with a gas chromatograph for FID detector detection analysis, and the detection result is shown in figure 2.
The glass transition temperature of polystyrene generated by styrene polymerization is 80-100 ℃, the melting temperature is 240 ℃, the decomposition temperature is more than 280 ℃, and the gasification temperature of a vaporizer of the existing detection device is usually lower than 200 ℃; after the injection pump injects for a period of time, the polystyrene generated by polymerization forms a glass substance in the vaporizer to block the vaporizer, and the glass substance cannot be decomposed and removed, so that the concentration of the styrene in the bypass test is gradually reduced; meanwhile, the injection pressure of the injection pump is increased due to the blockage of the pipeline, so that the injection pump is blocked and stops working.
The bypass concentration change of the apparatus was tested using the existing bubbling method, and the test substrate was styrene as an example. The mass flow meter controls the total flow of air to be 8.8L/min, wherein the flow of air entering the bubbling tank is 0.5L/min, the air and 8.3L/min air are uniformly mixed in the gas mixing tank, and the volume space velocity is 15000h -1 Styrene concentration of 5000mg/m 3 (ii) a Heating and heat preservation are adopted for all gas pipelines in the equipment by heating belts; the bypass outlet of the device is connected with a gas chromatograph for FID detector detection analysis, and the detection result is shown in figure 3.
A large amount of styrene reagent needs to be filled into the bubbling tank in the bubbling method test, and more styrene can volatilize into air in the filling and sealing processes, so that the experiment operation personnel are injured. Meanwhile, the unstable concentration of bypass styrene can occur in the test process of the bubbling method, and the longer gas pipeline increases the polymerization of styrene, thereby affecting the accuracy of the test result of the experiment.
The device is adopted for direct injection gasification method measurementThe bypass concentration of the test apparatus was varied and the test substrate was styrene as an example. The styrene injection amount of the injection pump is 80ul/min, the temperature of the tubular furnace is set to be 150 ℃, the air flow controlled by the mass flow meter is 8.8L/min, and the volume airspeed is 15000h -1 Styrene concentration of 5000mg/m 3 (ii) a Heating and heat preservation are adopted for all gas pipelines in the equipment by heating belts; the bypass outlet of the device is connected with a gas chromatograph for FID detector detection analysis, and the detection result is shown in FIG. 4.
By adopting the direct injection gasification method to test the equipment bypass, the concentration of the styrene is kept at 5000 +/-50 mg/m in the 20-hour continuous test process 3 In the range, the bypass concentration remained stable and did not tend to decline.
The performance of VOCs catalyst catalytic oxidation easily polymerized volatile organic compounds is detected by adopting the existing equipment, and acrylonitrile is taken as an example of a test substrate. The catalyst is tightly wrapped by heat preservation cotton and is loaded into a heating furnace, the experimental test temperature is 180-360 ℃, the heating rate of 10 ℃/min is increased to 180 ℃, and the test is carried out by taking one temperature point at every 20 ℃. The mass flow meter controls the air flow to be 8.8L/min, the acrylonitrile injection volume to be 60ul/min, the acrylonitrile bypass concentration to be 2000ppm, and the volume airspeed to be 15000h -1 The detection results are shown in FIG. 5.
And opening the first electromagnetic valve 8 when detecting the tail gas, adjusting the first rotor flowmeter 9, and controlling the amount of the tail gas entering the gas chromatograph to be 10ml/min. After the detection of one temperature point is finished, closing the first electromagnetic valve 8, opening the second electromagnetic valve 12, adjusting the second rotameter 13, controlling the amount of high-purity nitrogen entering the gas chromatograph to be 30ml/min, and purging the pipeline and the gas chromatograph; the results of the detection are shown in FIG. 6.
When the equipment is adopted to detect the performance of the VOCs catalyst for catalyzing acrylonitrile, the sample of the catalyst is consistent with the above, and when the reaction temperature is more than or equal to 280 ℃, the concentration of acrylonitrile in tail gas is 0, so that the standard emission requirement is met, and the catalyst can meet the application requirement of catalytic combustion industry.
The above-described embodiments and examples are presented for the purpose of illustrating the invention in a clear manner and not for the purpose of limiting the same, and the above-described embodiments and examples are illustrative of the operation of the invention, but are merely preferred embodiments of the invention, and it will be apparent to those skilled in the art that many other variations and modifications can be made on the basis of the above description. And should not be used to limit the invention. All changes, modifications and the like which come within the scope of the claims are to be embraced within their scope.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (8)
1. A catalytic combustion easy polymerization class VOCs's catalyst performance detection device which characterized in that includes:
a front end gas inlet part, a reaction part, a gas switching treatment part, a tail end detection part and a purging part;
the front end gas inlet part is used for feeding an easy-to-polymerize reagent into the reaction part;
the reaction part is used for reacting a catalyst with the easy polymerization reagent and controlling the reaction temperature;
the gas switching processing part is used for processing the easily polymerized reagent after reaction and controlling the flow of the entering gas;
the tail end detection part is used for detecting the tail gas emitted by the gas switching treatment part;
the purging part is used for treating residual gas in the device;
wherein the front end gas inlet part, the reaction part, the gas switching treatment part, the tail end detection part and the purging part are connected in sequence.
2. The device for detecting the performance of a catalyst for catalytic combustion of VOCs (volatile organic compounds) easy to polymerize according to claim 1, wherein the front end air inlet comprises an air compression device, a mass flow meter (17) and an injection pump (1), the air compression device is connected with the mass flow meter (17), and the injection pump (1) and the mass flow meter (17) are respectively connected with the reaction part through first pipelines.
3. The device for detecting the performance of the catalyst for catalytic combustion of VOCs (volatile organic compounds) easy to polymerize according to claim 2, wherein the reaction part comprises a heating device, a plurality of temperature control devices and a catalyst placing device, the catalyst placing device is fixedly placed inside the heating device, a part of the temperature control device extends into the heating device, the heating device is respectively connected with the injection pump (1) and the mass flow meter (17) through the first pipeline, and the heating device is connected with the gas switching processing part through a second pipeline.
4. The device for detecting the performance of the catalyst for catalytic combustion of VOCs (volatile organic compounds) easy to polymerize according to claim 3, wherein the gas switching part comprises a tail gas processing unit and a gas sample introduction switching unit, the tail gas processing unit is connected with the second pipeline and the gas sample introduction switching unit through a first three-way valve (7), and the heating equipment is connected with the gas sample introduction switching unit through the second pipeline.
5. The device for detecting the performance of the catalyst for catalytic combustion VOCs (volatile organic compounds) of easy polymerization according to claim 4, wherein the gas sampling switching unit comprises a first solenoid valve (8), a second solenoid valve (12), a first rotameter (9) and a second rotameter (13), the first three-way valve (7) is respectively connected with the second pipeline and the first solenoid valve (8), the first solenoid valve (8) is connected with the first rotameter (9), one end of the second solenoid valve (12) is connected with the second rotameter (13), the other end of the second solenoid valve is connected with the purging part, and the first rotameter (9) and the second rotameter (13) are connected with the end detecting part through a second three-way valve (10).
6. The device for detecting the performance of the catalyst for catalytic combustion of VOCs easy to polymerize according to claim 5, wherein the tail gas treatment unit adopts a tail gas alkali washing device.
7. The apparatus for detecting performance of a catalyst that catalyzes combustion of easily polymerizable VOCs according to claim 6, wherein the purge unit contains a high-purity gas.
8. The apparatus for detecting performance of a catalyst for catalytic combustion of VOCs having a tendency to polymerize according to claim 6, wherein the end detecting section includes a gas phase analyzing device connected to the second three-way valve (10) through a third pipe.
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| JP2008232695A (en) * | 2007-03-19 | 2008-10-02 | Shimadzu Corp | Water quality analyzer |
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| CN103687847A (en) * | 2011-07-13 | 2014-03-26 | 宇部兴产株式会社 | Method for producing isocyanate compound |
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| CN111855874A (en) * | 2020-09-05 | 2020-10-30 | 安徽昊源化工集团有限公司 | System for preventing polymerization of sampling tube of styrene chromatographic analyzer |
| CN113848280A (en) * | 2021-09-29 | 2021-12-28 | 北京工业大学 | Device for evaluating performance of catalyst |
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