CN110988208B - VOCs check out test set based on ion mobility spectrometry - Google Patents
VOCs check out test set based on ion mobility spectrometry Download PDFInfo
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- CN110988208B CN110988208B CN201911308181.3A CN201911308181A CN110988208B CN 110988208 B CN110988208 B CN 110988208B CN 201911308181 A CN201911308181 A CN 201911308181A CN 110988208 B CN110988208 B CN 110988208B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/88—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86
Abstract
The invention provides VOCs detection equipment based on ion mobility spectrometry, which comprises: one or more collection device, a sample preprocessing device for removing dust and dewatering, VOCs detector and controller, the VOCs detector includes the ion mobility spectrometry, the sample air inlet of ion mobility spectrometry is equipped with dimethyl silicon film and/or polypropylene film, every sampling device passes through the pipeline intercommunication with sample processing apparatus respectively, all be equipped with the solenoid valve on the pipeline between every sampling device and the sample preprocessing device, the sample air inlet intercommunication of sample preprocessing device and ion mobility spectrometry, the controller controls collection device respectively, the solenoid valve, sample preprocessing device and ion mobility spectrometry. The invention can effectively remove the interference of dust, moisture and ammonia molecules in the sample gas, improve the resolution of the ion mobility spectrometry, and rapidly, qualitatively and quantitatively analyze the VOCS at different positions so as to make a purification treatment scheme in a targeted manner.
Description
Technical Field
The invention relates to the technical field of waste gas detection, in particular to VOCs (volatile organic compounds) detection equipment based on ion mobility spectrometry.
Background
VOCs are acronyms for volatile organic compounds (volatile organic compounds). The VOCs mainly include alkanes, alkenes, aromatics, aldehydes, ketones, and the like, wherein most of the VOCs have a certain pungent odor, and even some of the VOCs have a certain carcinogenicity. In order to effectively monitor the content of volatile organic compounds in the flue gas, Ion Mobility Spectrometry (IMS) is often used for detection. The ion mobility spectrometer has the advantages of portability, rapidness, sensitivity, industrialization and the like, but the existence of other complex matrixes such as water vapor and the like in the flue gas greatly limits the identification and qualitative capacity and the quantitative capacity of the ion mobility spectrometer.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides VOCs detection equipment based on ion mobility spectrometry.
The invention provides VOCs detection equipment based on ion mobility spectrometry, which comprises: the device comprises one or more acquisition devices, a sample pretreatment device for dust removal and water removal, a VOCs detector and a controller;
the VOCs detector comprises an ion mobility spectrometry, a sample air inlet of the ion mobility spectrometry is provided with a dimethyl silicon film and/or a polypropylene film, each collecting device is communicated with a sample pretreatment device through a pipeline, an electromagnetic valve is arranged on the pipeline between each collecting device and the sample pretreatment device, the sample pretreatment device is communicated with the sample air inlet of the ion mobility spectrometry, and a controller is respectively in control connection with the collecting devices, the electromagnetic valves, the sample pretreatment device and the ion mobility spectrometry.
Preferably, the device further comprises a circulating gas path, the circulating gas path comprises a first circulating pipe, a VOCs purification treatment device and a second circulating pipe which are sequentially communicated, the first circulating pipe is communicated with an exhaust port of the ion mobility spectrometry, the second circulating pipe is communicated with a carrier gas inlet of the ion mobility spectrometry, and the controller is in control connection with the VOCs purification treatment device.
Preferably, the device further comprises a gas chromatograph for pre-separating a sample to be detected, the sample pre-treatment device is communicated with a sample gas inlet of the gas chromatograph through a pipeline, a gas outlet of the gas chromatograph is communicated with a sample gas inlet of the ion mobility spectrometer through a pipeline in sequence, and the second circulating pipe is communicated with a carrier gas inlet of the gas chromatograph.
Preferably, the collection device comprises a collection box and a fan, the collection box is provided with a first air inlet and a first exhaust port, a dust removal filter screen is arranged in the collection box, the first exhaust port is communicated with the fan through a pipeline, the fan is communicated with the sample pretreatment device through a pipeline, a corresponding electromagnetic valve is arranged on the pipeline between the fan and the sample pretreatment device, and the controller is in control connection with the fan.
Preferably, the sample preprocessing device includes a heating box, the heating box is provided with a plurality of second air inlets for being connected with a plurality of fans in a one-to-one correspondence manner through pipelines and a second air outlet for being connected with a sample air inlet of an ion mobility spectrometry or a gas chromatography through a pipeline, the heating box is provided with a first filter layer and a second filter layer, a drying agent layer is arranged between the first filter layer and the second filter layer, the heating box is provided with a temperature control device for controlling the heating box, and the controller is in control connection with the temperature control device.
Preferably, a plurality of solenoid valves are provided in the plurality of second air inlets in a one-to-one correspondence.
Preferably, the exhaust system further comprises a back-blowing purification device, the back-blowing purification device is respectively communicated with the second exhaust port and the first exhaust port, and the controller is in control connection with the back-blowing purification device.
Preferably, the mobile terminal further comprises a wireless communication device, and the controller is connected with the wireless communication device in a control mode, and the wireless communication device is used for signal connection with a remote server and/or the mobile terminal.
Compared with the prior art, the invention has the following beneficial effects:
(1) through setting up one or more collection system and being used for gathering the sample gas in different positions or place, the VOCs of different positions of accessible ion mobility spectrometry qualitative fast quantitative analysis to the purification treatment scheme is formulated to the pertinence.
(2) The sample pretreatment device is used for effectively removing dust and moisture in the sample gas, water molecules and ammonia molecules of the sample gas are further removed through the dimethyl silicon film and/or the polypropylene film, formation of ion clusters is inhibited, the resolution ratio of the ion mobility spectrometry is improved, the dryness inside the ion mobility spectrometry is effectively kept, and the qualitative and quantitative capabilities of detection are improved.
Drawings
Fig. 1 is a schematic structural diagram of a VOCs detection apparatus based on ion mobility spectrometry according to the present invention.
Description of reference numerals:
1-collection box 2-fan 3-sample pretreatment device 4-gas chromatography 5-ion mobility spectrometry
6-VOCs purification treatment device 7-first circulating pipe 8-second circulating pipe
9-back blowing purification device 10-electromagnetic valve
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments in the present application may be combined with each other; the present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 1, the present invention provides a VOCs detection apparatus based on ion mobility spectrometry, including: one or more acquisition devices, a sample pretreatment device 3 for dust removal and water removal, a VOCs detector and a controller;
the VOCs detector comprises an ion mobility spectrometry 5, a sample air inlet of the ion mobility spectrometry 5 is provided with a dimethyl silicon film and/or a polypropylene film, each collecting device is communicated with a sample pretreatment device through a pipeline, an electromagnetic valve 10 is arranged on the pipeline between each collecting device and the sample pretreatment device 3, the sample pretreatment device 3 is communicated with the sample air inlet of the ion mobility spectrometry 5, and a controller is respectively in control connection with the collecting device, the electromagnetic valve 10, the sample pretreatment device 3 and the ion mobility spectrometry 5.
According to the invention, one or more acquisition devices are arranged for acquiring sample gases at different positions or places, VOCS at different positions can be rapidly, qualitatively and quantitatively analyzed through the ion mobility spectrometry 5, so that a purification treatment scheme can be established in a targeted manner, dust and moisture in the sample gases are effectively removed through the sample pretreatment device 3, water molecules and ammonia molecules of the sample gases are further removed through the dimethyl silicon film and/or the polypropylene film, ion clusters are inhibited from being formed, the resolution of the ion mobility spectrometry 5 is improved, the dryness inside the ion mobility spectrometry 5 is effectively kept, and the qualitative and quantitative detection capabilities are improved.
In order to improve the miniaturization degree and the portability of the ion mobility spectrometry 5, in a specific embodiment, the ion mobility spectrometry system further comprises a circulating gas path, the circulating gas path comprises a first circulating pipe 7, a VOCs purification treatment device 6 and a second circulating pipe 8 which are sequentially communicated, the first circulating pipe 7 is communicated with an exhaust port of the ion mobility spectrometry 5, the second circulating pipe 8 is communicated with a carrier gas inlet of the ion mobility spectrometry 5, and the controller is connected with the VOCs purification treatment device in a control mode. The part of clean air after the treatment of the VOCs purification treatment device 6 is circulated and used as carrier gas, and an external or internal gas cylinder is not required to be connected, so that the miniaturization degree and the portability of the ion mobility spectrometry 5 can be greatly improved, and the device is suitable for various use environments.
In order to further improve the detection efficiency and the detection accuracy, in a further specific embodiment, the system further comprises a gas chromatograph for pre-separating a sample to be detected, the sample pre-processing device 3 is communicated with a sample inlet of the gas chromatograph 4 through a pipeline, an exhaust port of the gas chromatograph 4 is communicated with a sample inlet of the ion mobility spectrometer 5 through a pipeline in sequence, and the second circulating pipe 8 is communicated with a carrier gas inlet of the gas chromatograph 4. The gas chromatography and the ion mobility spectrometry 5 are combined, and the selected compound is identified by using GC (gas chromatography) retention time and IMS (ion mobility spectrometry) drift time, so that the detection efficiency and the detection precision are effectively improved.
In order to collect sample gas conveniently, in a further specific embodiment, the collection device comprises a collection box 1 and a fan 2, the collection box 1 is provided with a first air inlet and a first exhaust port, a dust removal filter screen is arranged in the collection box 1, the first exhaust port is communicated with the fan 2 through a pipeline, the fan 2 is communicated with the sample pretreatment device 3 through a pipeline, a corresponding electromagnetic valve 10 is arranged on the pipeline between the fan 2 and the sample pretreatment device 3, and the controller is in control connection with the fan 2.
In order to guarantee the dust removal and the water outlet effect, in a further specific embodiment, the sample preprocessing device 3 comprises a heating box, the heating box is provided with a plurality of second air inlets connected with the plurality of fans 2 in a one-to-one correspondence manner through pipelines and a second air outlet connected with the sample air inlet of the ion mobility spectrometry 5 or the gas chromatography through a pipeline, a first filter layer and a second filter layer are arranged in the heating box, a drying agent layer is arranged between the first filter layer and the second filter layer, the heating box is provided with a temperature control device used for controlling the heating box, and the controller is in control connection with the temperature control device.
In order to purge the sample gas between the new sample gas and ensure the accuracy of each detection, in a further specific embodiment, a plurality of electromagnetic valves 10 are arranged in the plurality of second air inlets in a one-to-one correspondence.
In order to avoid the collection device and the sample pretreatment device 3 being blocked by dust, in a further specific embodiment, the collection device further comprises a back-blowing purification device 9, the back-blowing purification device 9 is respectively communicated with the second exhaust port and the first exhaust port, and the controller is in control connection with the back-blowing purification device 9.
In order to facilitate timely viewing and storing of data, in a specific embodiment, the mobile terminal further includes a wireless communication device, and the controller is in control connection with the wireless communication device, and the wireless communication device is used for signal connection with a remote server and/or the mobile terminal.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The equipment for detecting the VOCs based on the ion mobility spectrometry is characterized by comprising one or more acquisition devices, a sample pretreatment device (3) for removing dust and water, a VOCs detector and a controller;
the VOCs detector comprises an ion mobility spectrometry (5), a sample air inlet of the ion mobility spectrometry (5) is provided with a dimethyl silicon film and/or a polypropylene film, each acquisition device is respectively communicated with a sample pretreatment device (3) through a pipeline, an electromagnetic valve (10) is arranged on the pipeline between each acquisition device and the sample pretreatment device (3), the sample pretreatment device (3) is communicated with the sample air inlet of the ion mobility spectrometry (5), and a controller respectively controls and connects the acquisition devices, the electromagnetic valves (10), the sample pretreatment device (3) and the ion mobility spectrometry (5);
the sample preprocessing device (3) comprises a heating box, a plurality of second air inlets which are connected with a plurality of fans (2) in a one-to-one correspondence mode through pipelines and a second air outlet which is connected with a sample air inlet of an ion mobility spectrometry (5) or a gas chromatography through a pipeline are arranged on the heating box, a first filter layer and a second filter layer are arranged in the heating box, a drying agent layer is arranged between the first filter layer and the second filter layer, a temperature control device used for controlling the heating box is arranged on the heating box, and the controller is in control connection with the temperature control device.
2. The ion mobility spectrometry-based VOCs detection equipment according to claim 1, further comprising a circulating gas circuit, wherein the circulating gas circuit comprises a first circulating pipe (7), a VOCs purification treatment device (6) and a second circulating pipe (8) which are sequentially communicated, the first circulating pipe (7) is communicated with the exhaust port of the ion mobility spectrometry (5), the second circulating pipe (8) is communicated with the carrier gas inlet of the ion mobility spectrometry (5), and the controller is in control connection with the VOCs purification treatment device (6).
3. The ion mobility spectrometry-based VOCs detection apparatus according to claim 2, further comprising a gas chromatograph for pre-separating a sample to be detected, wherein the sample pre-processing device (3) is in communication with the sample inlet of the gas chromatograph (4) through a pipeline, the gas outlet of the gas chromatograph (4) is in communication with the sample inlet of the ion mobility spectrometry (5) through a pipeline in sequence, and the second circulation pipe (8) is in communication with the carrier gas inlet of the gas chromatograph (4).
4. The ion mobility spectrometry-based VOCs detection device according to any one of claims 1-3, wherein the collection device comprises a collection box (1) and a fan (2), the collection box (1) is provided with a first air inlet and a first air outlet, a dust removal filter screen is arranged in the collection box (1), the first air outlet is communicated with the fan (2) through a pipeline, the fan (2) is communicated with the sample pre-processing device (3) through a pipeline, a corresponding electromagnetic valve (10) is arranged on the pipeline between the fan (2) and the sample pre-processing device (3), and the controller controls and connects the fan (2).
5. The ion mobility spectrometry-based VOCs detection apparatus of claim 1, wherein a plurality of solenoid valves (10) are disposed in a one-to-one correspondence in the plurality of second air inlets.
6. The ion mobility spectrometry-based VOCs detection apparatus according to claim 5, further comprising a back-blowing purification device (9), wherein the back-blowing purification device (9) is respectively communicated with the second exhaust port and the first exhaust port, and the controller is in control connection with the back-blowing purification device (9).
7. The ion mobility spectrometry-based VOCs detection apparatus of claim 1, further comprising a wireless communication device, wherein the controller is in control connection with the wireless communication device, and the wireless communication device is used for signal connection with a remote server and/or a mobile terminal.
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| CN201911308181.3A CN110988208B (en) | 2019-12-18 | 2019-12-18 | VOCs check out test set based on ion mobility spectrometry |
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| CN201911308181.3A CN110988208B (en) | 2019-12-18 | 2019-12-18 | VOCs check out test set based on ion mobility spectrometry |
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| CN111337598B (en) * | 2020-05-18 | 2020-09-11 | 同方威视技术股份有限公司 | Trace detection device |
| CN113092568A (en) * | 2021-03-22 | 2021-07-09 | 西北大学 | Real-time online ion mobility spectrometry monitoring device and method |
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