CN116236877B - Comprehensive experiment system for adsorbing and desorbing VOCs gas by using activated carbon - Google Patents
Comprehensive experiment system for adsorbing and desorbing VOCs gas by using activated carbon Download PDFInfo
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- CN116236877B CN116236877B CN202111482668.0A CN202111482668A CN116236877B CN 116236877 B CN116236877 B CN 116236877B CN 202111482668 A CN202111482668 A CN 202111482668A CN 116236877 B CN116236877 B CN 116236877B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 84
- 238000002474 experimental method Methods 0.000 title claims abstract description 66
- 238000001179 sorption measurement Methods 0.000 claims abstract description 123
- 239000007789 gas Substances 0.000 claims abstract description 101
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 238000003795 desorption Methods 0.000 abstract description 38
- 238000001816 cooling Methods 0.000 abstract description 8
- OKTJSMMVPCPJKN-IGMARMGPSA-N Carbon-12 Chemical class [12C] OKTJSMMVPCPJKN-IGMARMGPSA-N 0.000 description 21
- 238000012360 testing method Methods 0.000 description 4
- 239000002156 adsorbate Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention discloses a comprehensive experiment system for adsorbing and desorbing Volatile Organic Compounds (VOCs) gas by using activated carbon, which comprises a water vapor generator, a VOCs gas source tank, a nitrogen tank, a mixing buffer tank, an adsorption tank, a gas chromatograph, a VOCs gas storage tank, a quantitative air pump, a flowmeter, a bidirectional air pump, an air dryer and a stop valve, and belongs to the technical field of underground operation of oil and gas wells. The invention can perform adsorption experiments and desorption experiments of the activated carbon on the VOCs gas, and respectively study the influence of the activated carbon type, the working temperature of the adsorption box, the humidity and the flow rate of the VOCs gas on the adsorption and desorption efficiency. The cooling time of the adsorption box in adsorption and desorption experiments is reduced by the air cooling mode of the bidirectional air pump. Multiple groups of data under the same experimental conditions can be obtained by performing adsorption and desorption experiments of multiple active carbons in one experiment, so that the accuracy of experimental data is ensured, the experimental efficiency is greatly improved, and the labor intensity is reduced.
Description
Technical Field
The invention relates to the technical field of underground operation of oil and gas wells, is suitable for testing and researching relevant parameters such as the efficiency of adsorbing and desorbing VOCs gas by active carbon, and particularly relates to a comprehensive experiment system for adsorbing and desorbing the VOCs gas by the active carbon.
Background
In the section of 'terminal treatment and comprehensive utilization', the adsorption method is specifically proposed to be applicable to the treatment of VOCs in various concentration ranges and is a priority technology. The existing VOCs gas adsorption experiment can perform the influence of multiple factors on the adsorption efficiency, but has the following defects: (1) Only adsorption experiments can be carried out, and desorption experiments cannot be carried out at the same time. The adsorption and desorption experiments adopt two sets of experiment systems, so that the repeated investment and the cost are high, and the error of experimental data is larger due to the change of the experiment systems, so that the subsequent analysis and evaluation are influenced; (2) The VOCs gas adsorbates can be only tested one at a time, the test efficiency is low, and the adsorbates need to be continuously replaced; when the desorption test is carried out, the desorption temperature is high, and a long time is needed when the temperature variation test is carried out; and, to the adsorption and desorption experiments of same kind of adsorbate, the acquisition of a data often needs to repeat 4 experiments under the same experimental conditions to find the average value, guarantee that experimental data does not receive the influence of random condition, but current experimental apparatus only can once go on, not only can't guarantee the unanimity of experimental conditions, also cause experimental efficiency lower equally.
Therefore, it is needed to design an experimental system with comprehensive functions, capable of performing adsorption and desorption experiments simultaneously, and adjusting multiple experimental factors in the adsorption and desorption experiments, high experimental efficiency and low labor intensity for adsorbing and desorbing VOCs.
Disclosure of Invention
The invention aims to make up the defects of the prior art and provides a comprehensive experiment system for adsorbing and desorbing VOCs gas by activated carbon, which can simultaneously carry out adsorption and desorption experiments of the activated carbon on the VOCs gas, can study the influence of the type of the activated carbon, the working temperature, the humidity of the VOCs gas and the airflow velocity in an adsorption box on the adsorption efficiency in the adsorption experiment of the activated carbon on the VOCs gas, can study the influence of the type of the activated carbon, the working temperature of the adsorption box and the airflow velocity in the adsorption box on the adsorption efficiency in the desorption experiment of the activated carbon on the VOCs gas, and can carry out adsorption and desorption experiments of multiple activated carbons in one experiment or obtain multiple groups of data under the same experiment condition, thereby greatly improving the experiment efficiency and reducing the labor intensity while ensuring the accuracy and the reliability of the verification data.
In order to solve the technical problems, the invention adopts the following technical scheme:
A comprehensive experiment system for adsorbing and desorbing VOCs gas by activated carbon comprises a water vapor generator, a water vapor buffer tank, a VOCs gas source tank, a quantitative air pump, a nitrogen tank, a mixing buffer tank, an adsorption box, a bidirectional air pump, a gas chromatograph and a VOCs gas storage tank which are connected through system pipelines;
The output end of the steam generator is controllably connected with the input end of the steam buffer tank in an on-off mode;
The output end of the VOCs gas source tank is controllably connected with the on-off of the input end of the quantitative gas pump;
The output end of the water vapor buffer tank, the output end of the quantitative air pump and the output end of the nitrogen tank are respectively and controllably connected with the on-off state of the input end of the mixing buffer tank;
the output end of the mixing buffer tank is controllably connected with the input end of the adsorption box in an on-off mode;
The output end of the adsorption box is controllably connected with the input ends of the branch pipelines in an on-off mode;
each branch pipeline is also provided with a bidirectional air pump, the output end of each branch pipeline is also provided with a sampling port so as to convey the gas pumped out from the adsorption box to a gas chromatograph for detection, the output ends of the branch pipelines are also gathered together and connected with the input end of the VOCs gas storage tank in an on-off controllable manner;
The output end of the VOCs gas reservoir tank is connected with the water vapor generator so as to convey the VOCs gas to the water vapor generator and serve as fuel for generating water vapor by the water vapor generator;
The inner cavity of the adsorption box is equally divided into a plurality of channels which are not communicated with each other, wherein the number of the channels is consistent with that of the branch pipelines, the input end of each channel jointly forms the input end of the adsorption box, the output end of each channel is respectively connected with the input end of one branch pipeline in a one-to-one correspondence manner, and the same or different types of activated carbon are respectively placed in each channel. The same kind of activated carbon is used for obtaining multiple groups of data under the same experimental condition by one experiment, and different kinds of activated carbon are used for researching the influence rule of the activated carbon type on adsorption and desorption under the same experimental condition by one experiment.
Further, a temperature detection control device is arranged on the adsorption box, a group of heating devices are arranged in the adsorption box, and the temperature detection control device is used for controlling the heating devices to heat various activated carbon in the adsorption box and detecting the temperature of the various activated carbon.
Further, the activated carbon in each channel is uniformly provided with a plurality of airflow holes along the airflow flowing direction, the inlet or the outlet of each airflow hole is respectively provided with a plug, and each plug arranged at the inlet and each plug arranged at the outlet are mutually staggered.
Further, the adsorption tanks are arranged in parallel, one adsorption tank is an experimental main adsorption tank, the other adsorption tank is a standby adsorption tank, and the two adsorption tanks can be used together or independently according to requirements.
Further, a flowmeter I is arranged on a system pipeline connected with the output end of the water vapor buffer tank, a flowmeter II is arranged on a system pipeline connected with the output end of the VOCs gas source tank, and a flowmeter III is respectively arranged on the system pipeline connected with the input ends of the two adsorption tanks.
Further, each two-way air pump is connected with an air inlet in a on-off controllable mode, each air inlet is provided with an air dryer I, and the input end of the adsorption box is connected with an air outlet in a on-off controllable mode.
Further, an air dryer II is arranged on a system pipeline connected with the input end of the VOCs gas storage tank.
Compared with the prior art, each part in the integrated experimental system for adsorbing and desorbing VOCs gas by the activated carbon is controllably connected with the on-off state of the stop valve through the system pipeline, the integrated experimental system can be switched into an adsorption experimental system and a desorption experimental system by controlling the on-off state of the stop valve, the adsorption experiment of the activated carbon on the VOCs gas and the desorption experiment of the activated carbon after the VOCs gas is adsorbed can be carried out, and the influence of the type of the activated carbon, the working temperature of the adsorption box, the humidity and the flow rate of the VOCs gas on the adsorption efficiency and the influence of the type of the activated carbon, the working temperature of the adsorption box and the flow rate of the air flow on the desorption efficiency can be respectively studied. The installation mode and the structure of the activated carbon in the adsorption box enable the comprehensive experiment system to simultaneously perform experiments of various activated carbons, or obtain multiple groups of data through one experiment by one activated carbon. The cooling time of the adsorption box in the adsorption and desorption experiments is reduced by the air cooling mode of the bidirectional air pump, so that the error of an experiment system is reduced, the experiment efficiency is improved, the experiment cost is saved, and the intensity of experiment labor is reduced.
Drawings
In order that the advantages of the invention will be readily understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Understanding that these drawings depict only typical embodiments of the invention and are not therefore to be considered to be limiting of its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings.
FIG. 1 is a schematic diagram of the integrated experimental system for adsorbing and desorbing VOCs gas by using activated carbon;
FIG. 2 is a schematic diagram of a side view of an adsorption tank of the integrated experimental system for adsorbing and desorbing VOCs gas by activated carbon according to the present invention;
FIG. 3 is a schematic diagram of the front cut-away structure of the activated carbon of the integrated experimental system for adsorbing and desorbing VOCs gas by the activated carbon of the present invention;
FIG. 4 is a schematic side view of the structure of the activated carbon of the present invention.
In the figure: 1. a water vapor generator; 2. a water vapor buffer tank; 3. VOCs gas source tank; 4. a quantitative air pump; 5. a nitrogen tank; 6. a mixing buffer tank; 7. an adsorption box; 8. a branch pipeline; 9. a two-way air pump; 10. a gas chromatograph; 11. a VOCs gas reservoir tank; 12. activated carbon; 121. an air flow hole; 122. a plug; 13. a temperature detection control device; 14. a heating device; 15. a stop valve I; 16. a stop valve II; 17. a shut-off valve III; 18. a stop valve IV; 19. a stop valve V; 20. a stop valve VI; 21. a shut-off valve VII; 22. a shut-off valve VIII; 23. a shut-off valve IX; 24. a flowmeter I; 25. a flow meter II; 26. a flow meter III; 27. an air dryer I; 28. an air dryer II.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that embodiments of the invention may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the embodiments of the invention.
In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the present invention. It will be apparent that embodiments of the invention may be practiced without limitation to the specific details that are set forth by those skilled in the art. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments in addition to these detailed descriptions.
In the description of the present invention, the terms "inside", "outside", "longitudinal", "transverse", "upper", "lower", "top", "bottom", and the like refer to the orientation or positional relationship based on that shown in the drawings, only for convenience in describing the present invention, and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Embodiments of the present invention will be described in further detail below with reference to the attached drawings:
referring to fig. 1 to 4, the comprehensive experiment system for adsorbing and desorbing VOCs gas by activated carbon comprises a water vapor generator 1, a water vapor buffer tank 2, a VOCs gas source tank 3, a quantitative air pump 4, a nitrogen tank 5, a mixing buffer tank 6, an adsorption box group, a branch pipeline 8, a bidirectional air pump 9, a gas chromatograph 10, a VOCs gas storage tank 11, activated carbon 12, a temperature detection control device 13, a heating device 14, a flowmeter and an air dryer which are controllably connected with each other by system pipeline and cut-off valve on-off; wherein,
The output end of the water vapor generator 1 is connected with the input end of the water vapor buffer tank 2, the output end of the water vapor buffer tank 2 is connected with the input end of the mixing buffer tank 6, and a stop valve I15 and a flowmeter I24 are also arranged on a system pipeline between the water vapor buffer tank 2 and the mixing buffer tank 6;
The output end of the VOCs gas source tank 3 is connected with the input end of the mixing buffer tank 6, and a stop valve II 16, a quantitative air pump 4 and a flowmeter II 25 are also arranged on a system pipeline between the VOCs gas source tank 3 and the mixing buffer tank 6; the output end of the nitrogen tank 5 is connected with the input end of the mixing buffer tank 6, and a stop valve III 17 is also arranged on a system pipeline between the nitrogen tank 5 and the mixing buffer tank 6. The input end and the output end of the mixing buffer tank 6 are also respectively provided with a stop valve IV 18 and a stop valve V19;
The adsorption box group consists of two adsorption boxes 7 which are arranged in parallel; one is an experimental main adsorption box, and the other is a standby adsorption box; the two adsorption tanks 7 can be used together or independently according to the requirements, and the structures and the connection relations of the two adsorption tanks 7 are consistent; The structure and principle of the adsorption tank 7 will be described in detail by taking an example: the input end of the adsorption box 7 is connected with the output end of the mixing buffer tank 6, a stop valve VI 20 and a flowmeter III 26 are also arranged on a system pipeline between the adsorption box 7 and the mixing buffer tank 6, meanwhile, the input end of the adsorption box 7 is also connected with an air outlet, a stop valve VII 21 is arranged on the air outlet and is used for on-off control through the stop valve VII 21, the inner cavity of the adsorption box 7 is divided into four channels which are not communicated with each other by a partition plate, the input end of each channel jointly forms the input end of the adsorption box 7, the output end of each channel is respectively connected with the input end of a branch pipeline 8 in a one-to-one correspondence manner, The same or different types of activated carbon 12 are respectively placed in each channel, a temperature detection control device 13 is further arranged on the adsorption box 7, a group of heating devices 14 is further arranged in the adsorption box 7, the group of heating devices 14 can be arranged on a partition plate in the adsorption box 7 and used for heating all the activated carbon 12 in four channels, the temperature detection control device 13 is used for controlling the heating devices 14 to heat all the activated carbon 12 in the adsorption box 7, the temperature detection control device 13 can also detect the temperature of various activated carbon 12, the cross section shapes of the four channels can be processed into plane shapes such as but not limited to square, rectangle, round and the like, correspondingly, the end surface shape of each activated carbon 12 can be, but not limited to, square, rectangle, round and other plane shapes, a plurality of airflow holes 121 are uniformly processed on each activated carbon 12 along the airflow direction, the plurality of airflow holes 121 on each activated carbon 12 can be distributed in an array form of, but not limited to, square array, rectangle array, round array and the like, a plug 122 is respectively arranged at the inlet or the outlet of each airflow hole 121 on the same activated carbon 12, and the plugs 122 arranged at the inlet and the plugs 122 arranged at the outlet are mutually staggered, i.e. the plugs 122 do not block the inlet and the outlet of the airflow hole 121, The air flow hole 121 with the plug 122 at the inlet is not provided with the plug 122 at the outlet, the air flow hole 121 with the plug 122 at the outlet is not provided with the plug 122 at the inlet, air flow enters the activated carbon 12 from the inlet of the air flow hole 121 which is not blocked, air flow is forced to enter the adjacent air flow hole 121 through the activated carbon wall due to the blocked outlet of the air flow hole 121, and air flow flows out from the outlet of the adjacent air flow hole 121 due to the blocked inlet of the adjacent air flow hole 121 but the unblocked outlet; Each branch pipeline 8 is provided with a bidirectional air pump 9 and a stop valve VIII 22; each bidirectional air pump 9 is also provided with an air inlet, the air inlet, a stop valve IX 23 and an air dryer I27 are sequentially connected, so that each air inlet is controlled to be on-off through the corresponding stop valve IX 23 and the corresponding air dryer I27 carries out drying treatment on air absorbed from the atmosphere; the output end of each branch pipeline 8 is provided with a sampling port so as to be convenient for conveying the gas sucked from the adsorption box 7 to the gas chromatograph 10 for detection, meanwhile, the output ends of the branch pipelines 8 are also gathered together and connected with the input end of the VOCs gas storage tank 11, and an air dryer II 28 is also arranged on a system pipeline between the output end of each branch pipeline 8 and the input end of the VOCs gas storage tank 11; The output end of the VOCs gas reservoir tank 11 is connected to the water vapor generator 1 to supply VOCs gas to the water vapor generator 1 and to serve as fuel for generating water vapor by the water vapor generator 1.
Adsorption experiment:
And the stop valve III 17, the stop valve IV 18, the stop valve V19, the two stop valves VI 20 and the four stop valves VIII 22 are opened, the rest stop valves are closed, nitrogen in the nitrogen tank 5 is sucked into the mixing buffer tank 6 and the subsequent system pipelines and the adsorption box 7 by the four bidirectional air pumps 9, other gases such as air in the system pipelines are purged, other gases such as air in the system pipelines are discharged, and the influence on the subsequent experimental results is reduced. After the purge is completed, all shut-off valves are closed.
The stop valve I15 and the stop valve IV 18 are opened, the rest stop valves are closed, the water vapor generated by the water vapor generator 1 enters the mixing buffer tank 6 through a system pipeline after being buffered and controlled in the water vapor buffer tank 2, and the flow entering the mixing buffer tank 6 can be controlled through the stop valve I15 and is metered by the flowmeter I24. The stop valve II 16 and the stop valve IV 18 are opened, the rest stop valves are closed, VOCs gas in the VOCs gas source tank 3 is sucked into the mixing buffer tank 6 by the quantitative air pump 4, the flow entering the mixing buffer tank 6 can be controlled by the quantitative air pump 4 and is metered by the flowmeter II 25, so that mixed gas with a certain proportion of water vapor and VOCs gas can be formed in the mixing buffer tank 6, and the influence of the proportion (namely humidity) of the water vapor and the VOCs gas on the adsorption efficiency is studied. When the influence of humidity is not to be studied, water vapor may not be reserved.
The stop valve V19, the two stop valves VI 20 and the four stop valves VIII 22 are opened, the rest stop valves are closed, the water vapor and the VOCs gas according to the set proportion are uniformly mixed in the mixing buffer tank 6 and then are sucked into the two adsorption tanks 7 by the four bidirectional air pumps 9 according to the set flow, the air flow speed is controlled by the four bidirectional air pumps 9 and is detected by the two flow meters III 26, and therefore the influence of the air flow speed on the adsorption efficiency can be studied.
The mixed gas is absorbed by active carbon after entering two absorption boxes 7, one or four kinds of active carbon 12 are respectively arranged in each absorption box 7, and the active carbon 12 is distributed and installed in two rows and two columns to absorb VOCs gas. When an activated carbon 12 is placed, 4 sets of data can be obtained through one experiment under the same experimental conditions, and an average value can be obtained. When four kinds of activated carbon 12 are placed, adsorption research of the four kinds of activated carbon can be performed simultaneously, and then influence of adsorption carbon types on adsorption efficiency can be researched.
The temperature detection control device 13 and the heating device 14 are further arranged in each adsorption box 7, the temperature detection control device 13 can control the heating device 14 to heat various activated carbon 12 in the adsorption box 7, and then control the working temperature of the activated carbon in the adsorption box 7 when the activated carbon adsorbs VOCs gas, and the temperature detection control device 13 can also detect the heated temperature of various activated carbon 12, so that the influence of the working temperature of the adsorption box on the adsorption efficiency can be studied.
The mixture of the adsorbed water vapor and VOCs (non-adsorbed VOCs) is sucked from the two adsorption tanks 7 by four bidirectional air pumps 9, and is detected by a gas chromatograph 10 after sampling, thereby evaluating the adsorption efficiency under the corresponding activated carbon types, humidity, air flow speed and operating temperature of the adsorption tanks.
The mixed gas of the water vapor and the VOCs gas sucked from the two adsorption tanks 7 enters the VOCs gas storage tank 11 after the water vapor is removed by the air dryer II 28, the VOCs gas storage tank 11 is also connected with the water vapor generator 1, and the VOCs gas in the VOCs gas storage tank 11 can be used as fuel for generating the water vapor by the water vapor generator 1.
After a group of adsorption experiments are completed, the stop valve VII 21, the two stop valves VI 20 and the four stop valves IX 23 are opened, the rest stop valves are closed, the four bidirectional air pumps 9 can suck air from the atmosphere and enter the two adsorption tanks 7 through the four air dryers I27, the temperatures of the two adsorption tanks 7 can be reduced, the cooling speed is increased, and the waiting time of the next group of experiments is reduced.
Before the next group of experiments are started, a stop valve III 17, a stop valve IV 18, a stop valve V19, two stop valves VI 20 and four stop valves VIII 22 are opened, the rest stop valves are closed, nitrogen in the nitrogen tank 5 is sucked into the mixing buffer tank 6 and the subsequent system pipelines and the adsorption box 7 by the four bidirectional air pumps 9, and the residual mixed gas and air of VOCs gas and water vapor in the system are discharged, so that the influence of the mixed gas and air on the subsequent experimental results is reduced.
Desorption experiment:
the temperature detection control device 13 controls the heating device 14 to heat various active carbon 12 in the adsorption box 7, so that the adsorption box 7 maintains the working temperature required by desorption experiments.
The stop valve III 17, the stop valve IV 18, the stop valve V19, the two stop valves VI 20 and the four stop valves VIII 22 are opened, the rest stop valves are closed, nitrogen in the nitrogen tank 5 is sucked by the four bidirectional air pumps 9 to enter the mixing buffer tank 6 and the two adsorption tanks 7, at the moment, the nitrogen entering the adsorption tanks 7 is heated and used as desorption medium to desorb VOCs gas adsorbed in the activated carbon, the air flow speed of the nitrogen is controlled by the four bidirectional air pumps 9 and is detected by the two flow meters III 26, and therefore the influence of the air flow speed of the nitrogen on desorption efficiency can be studied.
The nitrogen gas gets into two adsorption tanks 7 and carries out the desorption of VOCs gas, has all put into one or four kinds of active carbon 12 in every adsorption tank 7, and active carbon 12 is two rows two and arranges the installation that distributes, and desorption VOCs gas can carry out the study of one or four kinds of active carbon desorption performance simultaneously.
The temperature detection control device 13 controls the heating device 14 to heat various activated carbon 12 in the adsorption box 7, so as to control the working temperature of the adsorption box 7 during desorption, and the temperature detection control device 13 can also detect the heated temperature of various activated carbon 12, so that the influence of the working temperature during desorption on the desorption efficiency can be studied.
The mixed gas of the desorbed nitrogen and the VOCs gas is sucked from the two adsorption tanks 7 by using four bidirectional air pumps 9, and is detected by using a gas chromatograph 10 after sampling, so as to evaluate the desorption efficiency of the corresponding activated carbon types, the air flow speed and the desorption working temperature of the adsorption tanks.
The mixed gas of nitrogen and VOCs gas sucked from the two adsorption tanks 7 passes through the air dryer II 28 to remove water vapor and then enters the VOCs gas storage tank 11, the VOCs gas storage tank 11 is also connected with the water vapor generator 1, and the VOCs gas in the VOCs gas storage tank 11 can be used as fuel for generating water vapor by the water vapor generator 1.
After a set of desorption experiments are completed, the stop valve VII 21, the two stop valves VI 20 and the four stop valves IX 23 are opened, the rest stop valves are closed, the four bidirectional air pumps 9 can suck air from the atmosphere and enter the two adsorption tanks 7 through the four air dryers I27, the temperatures of the two adsorption tanks 7 can be cooled, the cooling speed is increased, and the experimental efficiency of the desorption experiments, which is influenced by the temperature in the desorption experiments, is improved.
The comprehensive experiment system is switched into the adsorption experiment system and the desorption experiment system by controlling the on-off of the stop valve through the system pipeline and the stop valve, so that the adsorption experiment of the activated carbon on the VOCs and the desorption experiment of the activated carbon after the VOCs are adsorbed can be carried out, and the influence of the type of the activated carbon, the working temperature of the adsorption box, the humidity and the flow rate of the VOCs on the adsorption efficiency and the influence of the type of the activated carbon, the working temperature of the adsorption box and the flow rate of the air flow on the desorption efficiency can be respectively researched. The installation mode and the structure of the activated carbon in the adsorption box enable the comprehensive experiment system to simultaneously perform experiments of various activated carbons. The cooling time of the adsorption box in the desorption experiment can be reduced by the air cooling mode of the bidirectional air pump, so that the error of an experiment system is reduced, the experiment efficiency is improved, the experiment cost is saved, and the intensity of experiment labor is reduced.
It should be noted that the present invention is not limited to the above embodiments, and those skilled in the art may set forth other embodiments within the spirit of the present invention, and these embodiments are included in the scope of the present invention.
Claims (3)
1. The comprehensive experiment system for adsorbing and desorbing VOCs gas by using the activated carbon is characterized by comprising a water vapor generator, a water vapor buffer tank, a VOCs gas source tank, a quantitative air pump, a nitrogen tank, a mixed buffer tank, an adsorption box, a bidirectional air pump, a gas chromatograph and a VOCs gas storage tank which are connected through system pipelines;
The output end of the steam generator is controllably connected with the input end of the steam buffer tank in an on-off mode;
The output end of the VOCs gas source tank is controllably connected with the on-off of the input end of the quantitative gas pump;
The output end of the water vapor buffer tank, the output end of the quantitative air pump and the output end of the nitrogen tank are respectively and controllably connected with the on-off state of the input end of the mixing buffer tank;
the output end of the mixing buffer tank is controllably connected with the input end of the adsorption box in an on-off mode;
The output end of the adsorption box is controllably connected with the input ends of the branch pipelines in an on-off mode;
each branch pipeline is also provided with a bidirectional air pump, the output end of each branch pipeline is also provided with a sampling port so as to convey the gas pumped out from the adsorption box to a gas chromatograph for detection, the output ends of the branch pipelines are also gathered together and connected with the input end of the VOCs gas storage tank in an on-off controllable manner;
the output end of the VOCs gas storage tank is connected with the water vapor generator so as to convey the VOCs gas to the water vapor generator and serve as fuel for generating water vapor by the water vapor generator;
the inner cavity of the adsorption box is divided into a plurality of mutually non-communicated channels, wherein the number of the channels is consistent with that of the branch pipelines, the input end of each channel jointly forms the input end of the adsorption box, the output end of each channel is respectively connected with the input end of one branch pipeline in a one-to-one correspondence manner, and different types of activated carbon are respectively placed in each channel;
The adsorption box is provided with a temperature detection control device, a group of heating devices are arranged in the adsorption box, and the temperature detection control device is used for controlling the heating devices to heat various active carbon in the adsorption box and detecting the temperature of the various active carbon; the number of the adsorption tanks is two, and the two adsorption tanks are arranged in parallel; a flowmeter I is arranged on a system pipeline connected with the output end of the water vapor buffer tank, a flowmeter II is arranged on a system pipeline connected with the output end of the VOCs gas source tank, and a flowmeter III is respectively arranged on a system pipeline connected with the input ends of the two adsorption tanks; an air inlet is controllably connected to each two-way air pump in a on-off mode, an air dryer I is arranged on each air inlet, and an air outlet is controllably connected to the input end of the adsorption box in a on-off mode.
2. The comprehensive experiment system for adsorbing and desorbing VOCs gas by using activated carbon according to claim 1, wherein a plurality of airflow holes are uniformly formed in each channel along the airflow direction, a plug is respectively arranged at the inlet or the outlet of each airflow hole, and the plugs arranged at the inlet and the plugs arranged at the outlet are mutually staggered.
3. The comprehensive experiment system for adsorbing and desorbing VOCs gas by using active carbon according to claim 1, wherein an air dryer II is arranged on a system pipeline connected with the input end of the VOCs gas storage tank.
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| CN113368659A (en) * | 2021-06-22 | 2021-09-10 | 航天凯天环保科技股份有限公司 | Combined activated carbon equipment |
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