CN113686945A - Rapid analysis and detection system and method for volatile organic compounds in asphalt flue gas - Google Patents
Rapid analysis and detection system and method for volatile organic compounds in asphalt flue gas Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 130
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 53
- 238000001514 detection method Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004458 analytical method Methods 0.000 title claims abstract description 28
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims description 24
- 239000003546 flue gas Substances 0.000 title claims description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 74
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 49
- 239000004917 carbon fiber Substances 0.000 claims abstract description 49
- 239000002904 solvent Substances 0.000 claims abstract description 31
- 239000000779 smoke Substances 0.000 claims abstract description 26
- 239000002184 metal Substances 0.000 claims abstract description 21
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 42
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 40
- 150000002500 ions Chemical class 0.000 claims description 34
- 239000011521 glass Substances 0.000 claims description 20
- 238000001819 mass spectrum Methods 0.000 claims description 13
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- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 6
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- 150000001875 compounds Chemical class 0.000 abstract description 4
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- 238000004949 mass spectrometry Methods 0.000 description 18
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- 230000007613 environmental effect Effects 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- -1 metalloporphyrins Chemical class 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 206010028980 Neoplasm Diseases 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 201000011510 cancer Diseases 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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Abstract
The invention belongs to the technical field of analysis and detection, and discloses a rapid analysis and detection system and a rapid analysis and detection method for volatile organic compounds in asphalt smoke, wherein the analysis and detection system comprises: the sample inlet of the mass spectrometer is connected with a metal sleeve through a high-voltage power line, the metal sleeve is connected with a solvent pipeline, carbon fibers are arranged in the metal sleeve, and an auxiliary solvent is arranged in the solvent pipeline; the heating device is arranged below the carbon fibers, the asphalt sample to be detected is placed on the heating device, and the heating device is used for heating the asphalt sample to be detected. The analysis and detection system has simple structure, easy construction and low cost; the method has the advantages of high throughput, rapidness and high sensitivity, the molecular weight range of the detected compound is 10-1000Da, the real-time direct analysis of volatile components in the asphalt at different temperatures can be realized, and an important reference can be provided for the implementation temperature during the construction of the asphalt pavement.
Description
Technical Field
The invention relates to the technical field of analysis and detection, in particular to a system and a method for rapidly analyzing and detecting volatile organic compounds in asphalt smoke.
Background
Asphalt has excellent rheological property, so that the asphalt is always used as an important road engineering material for highway construction in China. Bitumen is extremely complex in chemical composition, and its composition usually includes alkanes, polycyclic aromatic hydrocarbons, metalloporphyrins, heterocyclic compounds, and the like. In road surface engineering, asphalt materials are mixed with different engineering materials as binders to form a final asphalt mixture. The production of the asphalt mixture can adopt hot-mix asphalt or warm-mix asphalt technology, the two mixing processes are carried out at different production temperatures, the mixing and compacting temperatures in the hot-mix process are generally over 140 ℃, a large amount of Volatile Organic Compounds (VOCs) can be released in the stirring and paving processes due to the high working temperature during asphalt construction, serious air pollution can be inevitably caused, and respiratory tract or different cancer diseases can be caused by long-term contact and inhalation of the VOCs. Therefore, there is an increasing worldwide pressure to reduce the emission of soot. It can be seen that the environmental hazard of asphalt fumes is of much concern in order to construct green traffic systems worldwide.
In recent decades, the field of chemical analysis of bitumen soot has attracted renewed interest to researchers, as it is a prerequisite for the development of new methods for reducing the emission of volatile organic compounds from bitumen. However, due to the complex chemical composition of asphalt fumes, the characterization method is still limited. Current methods include fluorescence and uv-vis spectrophotometry, which are only used to detect the overall characteristics of VOCs and are difficult to perform for single component analysis. The mass spectrometry technology is widely applied to the field of asphalt analysis as a powerful analysis technology. For example, thermogravimetric analysis-mass spectrometry, proton transfer reaction time-of-flight mass spectrometry, and gas chromatography-mass spectrometry have been used to assess emissions of VOCs in different bituminous materials. Although there are many advantages to the mass spectrometry technique, there are some significant disadvantages. Most importantly, the molecular weight of the compounds detected by the mass spectrometry currently used for detecting the asphalt smoke is limited to 400Da, and the results of the gas chromatography-mass spectrometry cannot reveal the true molecular weight distribution of the asphalt smoke. Therefore, it is necessary to establish a new method for realizing direct real-time analysis of asphalt smoke in a larger mass range.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a system and a method for rapidly analyzing and detecting volatile organic compounds in asphalt smoke, wherein the system is simple in structure, easy to build and low in cost; the method has the advantages of high throughput, rapidness and high sensitivity, the molecular weight range of the detected compound is 10-1000Da, the real-time direct analysis of volatile components in the asphalt at different temperatures can be realized, and an important reference can be provided for the implementation temperature during the construction of the asphalt pavement.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
A quick analysis and detection system for volatile organic compounds in asphalt flue gas includes: the sample inlet of the mass spectrometer is connected with a metal sleeve through a high-voltage power line, the metal sleeve is connected with a solvent pipeline, carbon fibers are arranged in the metal sleeve, and an auxiliary solvent is arranged in the solvent pipeline;
the heating device is arranged below the carbon fibers, the asphalt sample to be detected is placed on the heating device, and the heating device is used for heating the asphalt sample to be detected.
Preferably, the heating device comprises a heating plate and a temperature regulator; the signal output end of the temperature regulator is electrically connected with the signal input end of the heating plate, and the asphalt sample to be tested is placed on the heating plate.
Preferably, the length of the carbon fiber is 10-15 mm.
Preferably, the distance between the asphalt sample to be detected and the sample inlet of the mass spectrometer is 5-10mm, the distance between the asphalt sample to be detected and the carbon fiber is 5-10mm, and the distance between the carbon fiber and the sample inlet of the mass spectrometer is 5-10 mm.
(II) the method for rapidly analyzing and detecting the volatile organic compounds in the asphalt smoke comprises the following steps:
step 1, placing an asphalt sample to be detected on a glass slide, then placing the glass slide filled with the asphalt sample to be detected on a heating plate, and adjusting the temperature of the heating plate through a temperature regulator to enable the heating plate to heat the asphalt sample to be detected;
and 2, ionizing volatile organic compounds in the heated asphalt sample to be detected in real time by using the carbon fibers as an ionization source, and allowing the ionized volatile organic compounds to enter a mass spectrometer through an ion transfer tube for mass spectrum detection to determine the chemical component mass distribution change condition of the volatile organic compounds in the asphalt smoke.
Preferably, in the step 1, the content of the asphalt sample to be detected is 1-20 mg.
Preferably, in step 1, the temperature of the heating plate is adjusted to be in the range of 30-500 ℃.
Preferably, in step 2, the length of the carbon fiber is 10-15 mm.
Preferably, in step 2, the mass spectrometry detection conditions are as follows: the temperature of the ion transmission tube is 250-280 ℃, the voltage of the high-voltage power supply is 2000-3000V, the mass interval is set to be 10-1000Da, and a positive ion mode and a negative ion mode are adopted; the solvent is methanol or acetonitrile.
Further preferably, the flow rate of the solvent is 3 to 10. mu.L/min.
Compared with the prior art, the invention has the beneficial effects that:
1) according to the rapid analysis and detection system for volatile organic compounds in asphalt smoke, the temperature regulator and the heating plate are added on the basis of the carbon fiber ion source, and the asphalt to-be-detected sample is placed on the heating plate, so that the volatile components in the asphalt sample are directly and rapidly analyzed in real time, namely the asphalt smoke is generated and enters the mass spectrometer for rapid detection and analysis.
2) The method for rapidly analyzing and detecting the volatile organic compounds in the asphalt flue gas can rapidly obtain the relative intensity data of the compound peak of the mass distribution of the components of the asphalt flue gas within 1-5 minutes, and has the advantages of larger molecular weight range, higher analysis speed and higher flux compared with the existing gas chromatography-mass spectrometry (GC-MS) method, and has the application potential of being connected with various mass spectrometers. The method is used in addition to the existing GC-MS method, and has important significance for analyzing and monitoring the components of the asphalt smoke.
3) The open ionization method has no precedent in the analysis of the asphalt smoke, and the invention develops a related mass spectrometry method by building a rapid analysis and detection system for volatile organic compounds in the asphalt smoke, really realizes rapid and direct evaluation of components of the asphalt smoke, and has important application potential in the field of environmental monitoring in future road construction. And the carbon fiber ionization technology and the mass spectrometry are combined, so that the method is suitable for analyzing the asphalt smoke and evaluating the difference distribution of volatile components in the asphalt smoke at different heating temperatures.
Drawings
The invention is described in further detail below with reference to the figures and specific embodiments.
FIG. 1 is a schematic structural diagram of a system for directly and rapidly analyzing volatile organic compounds in asphalt flue gas according to the present invention;
FIG. 2 is a mass spectrum of matrix asphalt obtained in a positive ion detection mode at 50-200 ℃;
FIG. 3 is a mass spectrum of matrix asphalt obtained in a mass spectrometry negative ion detection mode at 50-200 ℃;
FIG. 4 is a mass spectrum of an asphalt saturator obtained in a 140 ℃ positive ion detection mode;
FIG. 5 is a mass spectrum of an aromatic component of asphalt obtained in a positive ion detection mode at 140 ℃;
FIG. 6 is a mass spectrum of the pitch colloid component obtained in the 140 ℃ positive ion detection mode;
FIG. 7 is a mass spectrum of an asphaltene component obtained in the 140 ℃ positive ion detection mode;
FIG. 8 is a mass spectrum of SBS modified asphalt obtained in 140 deg.C positive ion detection mode.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
Example 1
The method for rapidly analyzing and detecting the volatile components in the matrix asphalt comprises the following steps:
step 1, referring to fig. 1, building a direct and rapid analysis system for volatile organic compounds in asphalt flue gas
The carbon fiber with the length of 1.5cm is communicated with a solvent pipeline through a metal sleeve, a high-voltage power supply is clamped at the front end of a sample inlet of the metal sleeve and a mass spectrometer, a heating plate is placed below the carbon fiber, a temperature regulator is electrically connected with the heating plate, the temperature of the heating plate is regulated through the temperature regulator, and then the temperature generated by asphalt smoke on the heating plate is regulated. The distance b between the carbon fiber and the sample inlet of the mass spectrometer is 1cm, the distance d between the pitch sample to be detected and the sample inlet of the mass spectrometer is 1cm, and the distance c between the pitch sample to be detected and the carbon fiber is 0.5 cm.
Step 2, placing 10mg of matrix asphalt (asphalt sample to be detected) on a glass slide, wherein the size of the glass slide is 20mm multiplied by 20 mm; and then placing the glass slide filled with the matrix asphalt on a heating plate, adjusting the temperature of the heating plate through a temperature regulator, heating the asphalt sample to be measured by the heating plate, heating the heating plate from 50 ℃, increasing the temperature gradually according to 10 ℃ and increasing the temperature to 200 ℃, and measuring the mass distribution change of the volatile chemical components in the matrix asphalt at different temperatures.
Step 3, using the carbon fiber as an ionization source to ionize volatile organic compounds in the heated asphalt sample to be detected in real time, allowing the ionized volatile organic compounds to enter a mass spectrometer through an ion transfer tube for mass spectrum detection, and determining the chemical component mass distribution change condition of the volatile organic compounds in the asphalt smoke, wherein the mass spectrum detection condition is as follows: the temperature of the ion transmission tube is 250 ℃, the ionization voltage is 2500V (voltage at a in figure 1), the solvent in the solvent pipeline adopts methanol, and the flow rate of the methanol is 5 mu L/min; the mass spectrometer acquires spectrograms at intervals of 10 ℃ for 1min, and the average spectrograms of the temperatures under the positive and negative ion modes are shown in figures 2 and 3, so that the mass distribution change of chemical components in the asphalt smoke at different temperatures can be clearly reflected in figures 2-3.
Example 2
The method for rapidly analyzing and detecting the volatile components of the saturated components of the asphalt comprises the following steps:
step 1, building a direct and rapid analysis system for volatile organic compounds in asphalt flue gas
The carbon fiber with the length of 1.5cm is communicated with a solvent pipeline through a metal sleeve, a high-voltage power supply is clamped at the front end of a sample inlet of the metal sleeve and a mass spectrometer, a heating plate is placed below the carbon fiber, a temperature regulator is electrically connected with the heating plate, the temperature of the heating plate is regulated through the temperature regulator, and then the temperature generated by asphalt smoke on the heating plate is regulated. The distance b between the carbon fiber and the sample inlet of the mass spectrometer is 1cm, the distance d between the pitch sample to be detected and the sample inlet of the mass spectrometer is 1cm, and the distance c between the pitch sample to be detected and the carbon fiber is 0.5 cm.
Step 2, placing 1mg of asphalt saturation fraction (asphalt sample to be detected) on a glass slide, wherein the size of the glass slide is 20mm multiplied by 20 mm; and then placing the glass slide filled with the asphalt saturation fraction on a heating plate, adjusting the temperature of the heating plate through a temperature regulator, and heating the temperature of the asphalt saturation fraction to 140 ℃ by using the heating plate.
Step 3, using the carbon fiber as an ionization source to ionize volatile organic compounds in the heated asphalt saturates in real time, wherein the ionized volatile organic compounds enter a mass spectrometer through an ion transfer tube to perform mass spectrometry, and the mass spectrometry is performed under the following conditions: the temperature of the ion transmission tube is 250 ℃, the ionization voltage is 2500V, the solvent in the solvent pipeline adopts methanol, and the flow rate of the methanol is 5 mu L/min; the mass spectrometer collects the spectrogram of 1min, the mass spectrogram of the 140 ℃ positive ion detection mode is shown in figure 4, and the mass distribution change of chemical components in the asphalt saturation fraction at the temperature can be clearly reflected in figure 4.
Example 3
The method for rapidly analyzing and detecting the volatile components in the aromatic components of the asphalt comprises the following steps:
step 1, building a direct and rapid analysis system for volatile organic compounds in asphalt flue gas
The carbon fiber with the length of 1.5cm is communicated with a solvent pipeline through a metal sleeve, a high-voltage power supply is clamped at the front end of a sample inlet of the metal sleeve and a mass spectrometer, a heating plate is placed below the carbon fiber, a temperature regulator is electrically connected with the heating plate, the temperature of the heating plate is regulated through the temperature regulator, and then the temperature generated by asphalt smoke on the heating plate is regulated. The distance b between the carbon fiber and the sample inlet of the mass spectrometer is 1cm, the distance d between the pitch sample to be detected and the sample inlet of the mass spectrometer is 1cm, and the distance c between the pitch sample to be detected and the carbon fiber is 0.5 cm.
Step 2, placing 1mg of asphalt aromatic component (to-be-detected asphalt sample) on a glass slide, wherein the size of the glass slide is 20mm multiplied by 20 mm; and then placing the glass slide filled with the asphalt aromatic molecules on a heating plate, adjusting the temperature of the heating plate through a temperature regulator, and heating the temperature of the asphalt aromatic molecules to 140 ℃ by using the heating plate.
Step 3, using the carbon fiber as an ionization source to ionize volatile organic compounds in the heated asphalt aromatic component in real time, wherein the ionized volatile organic compounds enter a mass spectrometer through an ion transfer tube to perform mass spectrometry, and the conditions of the mass spectrometry are as follows: the temperature of the ion transmission tube is 250 ℃, the ionization voltage is 2500V, the solvent in the solvent pipeline adopts methanol, and the flow rate of the methanol is 5 mu L/min; the mass spectrometer collects the spectrogram of 1min, the mass spectrogram of the 140 ℃ positive ion detection mode is shown in figure 5, and the mass distribution change of chemical components in the asphalt aromatic component at the temperature can be clearly reflected in figure 5.
Example 4
The method for rapidly analyzing and detecting the volatile components in the asphalt colloid component comprises the following steps:
step 1, building a direct and rapid analysis system for volatile organic compounds in asphalt flue gas
The carbon fiber with the length of 1.5cm is communicated with a solvent pipeline through a metal sleeve, a high-voltage power supply is clamped at the front end of a sample inlet of the metal sleeve and a mass spectrometer, a heating plate is placed below the carbon fiber, a temperature regulator is electrically connected with the heating plate, the temperature of the heating plate is regulated through the temperature regulator, and then the temperature generated by asphalt smoke on the heating plate is regulated. The distance b between the carbon fiber and the sample inlet of the mass spectrometer is 1cm, the distance d between the pitch sample to be detected and the sample inlet of the mass spectrometer is 1cm, and the distance c between the pitch sample to be detected and the carbon fiber is 0.5 cm.
Step 2, placing 1mg of asphalt colloid component (asphalt sample to be detected) on a glass slide, wherein the size of the glass slide is 20mm multiplied by 20 mm; the slide with the pitch colloid component was then placed on a hot plate, the temperature of which was adjusted by a temperature regulator, and the temperature of the pitch colloid component was heated to 140 ℃ using the hot plate.
Step 3, using the carbon fiber as an ionization source to ionize volatile organic compounds in the heated asphalt colloid component in real time, and allowing the ionized volatile organic compounds to enter a mass spectrometer through an ion transfer tube for mass spectrometry, wherein the mass spectrometry conditions are as follows: the temperature of the ion transmission tube is 250 ℃, the ionization voltage is 2500V, the solvent in the solvent pipeline adopts methanol, and the flow rate of the methanol is 5 mu L/min; the mass spectrometer collects the spectrogram of 1min, the mass spectrogram of the 140 ℃ positive ion detection mode is shown in fig. 6, and the mass distribution change of chemical components in the asphalt colloid component at the temperature can be clearly reflected in fig. 6.
Example 5
The method for rapidly analyzing and detecting the volatile components in the asphaltene components comprises the following steps:
step 1, building a direct and rapid analysis system for volatile organic compounds in asphalt flue gas
The carbon fiber with the length of 1.5cm is communicated with a solvent pipeline through a metal sleeve, a high-voltage power supply is clamped at the front end of a sample inlet of the metal sleeve and a mass spectrometer, a heating plate is placed below the carbon fiber, a temperature regulator is electrically connected with the heating plate, the temperature of the heating plate is regulated through the temperature regulator, and then the temperature generated by asphalt smoke on the heating plate is regulated. The distance b between the carbon fiber and the sample inlet of the mass spectrometer is 1cm, the distance d between the pitch sample to be detected and the sample inlet of the mass spectrometer is 1cm, and the distance c between the pitch sample to be detected and the carbon fiber is 0.5 cm.
Step 2, placing 1mg of asphaltene component (an asphalt sample to be detected) on a glass slide, wherein the size of the glass slide is 20mm multiplied by 20 mm; the slide with the asphaltene component was then placed on a hot plate, the temperature of which was adjusted by a temperature regulator, and the temperature of the asphaltene component was heated to 140 ℃ using the hot plate.
Step 3, using the carbon fiber as an ionization source to ionize volatile organic compounds in the heated asphaltene component in real time, wherein the ionized volatile organic compounds enter a mass spectrometer through an ion transfer tube to perform mass spectrometry, and the conditions of the mass spectrometry are as follows: the temperature of the ion transmission tube is 250 ℃, the ionization voltage is 2500V, the solvent in the solvent pipeline adopts methanol, and the flow rate of the methanol is 5 mu L/min; the mass spectrometer collects the 1min spectrogram, the mass spectrogram of the 140 ℃ positive ion detection mode is shown in fig. 7, and the mass distribution change of chemical components in the asphaltene component at the temperature can be clearly reflected in fig. 7.
Example 6
The rapid analysis and detection method for the volatile components in the SBS modified asphalt comprises the following steps:
step 1, building a direct and rapid analysis system for volatile organic compounds in asphalt flue gas
The carbon fiber with the length of 1.5cm is communicated with a solvent pipeline through a metal sleeve, a high-voltage power supply is clamped at the front end of a sample inlet of the metal sleeve and a mass spectrometer, a heating plate is placed below the carbon fiber, a temperature regulator is electrically connected with the heating plate, the temperature of the heating plate is regulated through the temperature regulator, and then the temperature generated by asphalt smoke on the heating plate is regulated. The distance b between the carbon fiber and the sample inlet of the mass spectrometer is 1cm, the distance d between the pitch sample to be detected and the sample inlet of the mass spectrometer is 1cm, and the distance c between the pitch sample to be detected and the carbon fiber is 0.5 cm.
Step 2, placing 10mg of SBS modified asphalt (an asphalt sample to be detected) on a glass slide, wherein the size of the glass slide is 20mm multiplied by 20 mm; and then placing the glass slide filled with the SBS modified asphalt on a heating plate, adjusting the temperature of the heating plate through a temperature regulator, and heating the SBS modified asphalt to 140 ℃ by using the heating plate.
Step 3, using the carbon fiber as an ionization source to ionize volatile organic compounds in the heated SBS modified asphalt in real time, wherein the ionized volatile organic compounds enter a mass spectrometer through an ion transfer tube to perform mass spectrometry, and the mass spectrometry is performed under the following conditions: the temperature of the ion transmission tube is 250 ℃, the ionization voltage is 2500V, the solvent in the solvent pipeline adopts methanol, and the flow rate of the methanol is 5 mu L/min; the mass spectrometer collects the spectrogram of 1min, the mass spectrogram of the 140 ℃ positive ion detection mode is shown in fig. 8, and the mass distribution change of the chemical components in the SBS modified asphalt at the temperature can be clearly reflected in fig. 8.
In the above embodiments, the mass spectrometer may adopt a low-resolution mass spectrometer and a high-resolution mass spectrometer, or adopt a portable small-sized mass spectrometer, and the mass spectrometer is used for analyzing asphalt flue gas to be detected and acquiring spectrogram data.
The working principle of the system for directly and quickly analyzing the volatile organic compounds in the asphalt flue gas provided by the invention is as follows: the carbon fiber is used as an ionization source to ionize volatile components in asphalt smoke released by heating in real time, and the ionized volatile components enter a mass spectrum through an ion transmission pipe to be analyzed and measured.
Although the present invention has been described in detail in this specification with reference to specific embodiments and illustrative embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A quick analysis detecting system for volatile organic compounds in pitch flue gas, its characterized in that includes: the sample inlet of the mass spectrometer is connected with a metal sleeve through a high-voltage power line, the metal sleeve is connected with a solvent pipeline, carbon fibers are arranged in the metal sleeve, and an auxiliary solvent is arranged in the solvent pipeline;
the heating device is arranged below the carbon fibers, the asphalt sample to be detected is placed on the heating device, and the heating device is used for heating the asphalt sample to be detected.
2. The system for rapidly analyzing and detecting the volatile organic compounds in the asphalt flue gas according to claim 1, wherein the heating device comprises a heating plate and a temperature regulator; the signal output end of the temperature regulator is electrically connected with the signal input end of the heating plate, and the asphalt sample to be tested is placed on the heating plate.
3. The system for rapidly analyzing and detecting the volatile organic compounds in the asphalt flue gas according to claim 1, wherein the length of the carbon fiber is 10-15 mm.
4. The system for rapidly analyzing and detecting the volatile organic compounds in the asphalt flue gas according to claim 1, wherein the distance between the asphalt sample to be detected and the sample inlet of the mass spectrometer is 5-10mm, the distance between the asphalt sample to be detected and the carbon fiber is 5-10mm, and the distance between the carbon fiber and the sample inlet of the mass spectrometer is 5-10 mm.
5. The method for rapidly analyzing and detecting the volatile organic compounds in the asphalt flue gas is characterized by comprising the following steps of:
step 1, placing an asphalt sample to be detected on a glass slide, then placing the glass slide filled with the asphalt sample to be detected on a heating plate, and adjusting the temperature of the heating plate through a temperature regulator to enable the heating plate to heat the asphalt sample to be detected;
and 2, ionizing volatile organic compounds in the heated asphalt sample to be detected in real time by using the carbon fibers as an ionization source, and allowing the ionized volatile organic compounds to enter a mass spectrometer through an ion transfer tube for mass spectrum detection to determine the chemical component mass distribution change condition of the volatile organic compounds in the asphalt smoke.
6. The method for rapidly analyzing and detecting the volatile organic compounds in the asphalt flue gas according to claim 5, wherein in the step 1, the content of the asphalt sample to be detected is 1-20 mg.
7. The method for rapidly analyzing and detecting the volatile organic compounds in the asphalt flue gas according to claim 5, wherein in the step 1, the temperature of the heating plate is adjusted within a range of 30-500 ℃.
8. The method for rapidly analyzing and detecting the volatile organic compounds in the asphalt flue gas according to claim 5, wherein in the step 2, the length of the carbon fiber is 10-15 mm.
9. The method for rapidly analyzing and detecting the volatile organic compounds in the asphalt flue gas according to claim 5, wherein in the step 2, the conditions for mass spectrum detection are as follows: the temperature of the ion transmission tube is 250-280 ℃, the voltage of the high-voltage power supply is 2000-3000V, the mass interval is set to be 10-1000Da, and a positive ion mode and a negative ion mode are adopted; the auxiliary solvent is methanol or acetonitrile.
10. The method for rapidly analyzing and detecting the volatile organic compounds in the asphalt flue gas according to claim 9, wherein the flow rate of the auxiliary solvent is 3-10 μ L/min.
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