CN112147248A - Method for rapidly determining content of benzene series components in waste gas of fixed pollution source - Google Patents
Method for rapidly determining content of benzene series components in waste gas of fixed pollution source Download PDFInfo
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- CN112147248A CN112147248A CN202011010795.6A CN202011010795A CN112147248A CN 112147248 A CN112147248 A CN 112147248A CN 202011010795 A CN202011010795 A CN 202011010795A CN 112147248 A CN112147248 A CN 112147248A
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- 238000000034 method Methods 0.000 title claims abstract description 7
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- 239000007789 gas Substances 0.000 claims abstract description 144
- 238000001514 detection method Methods 0.000 claims abstract description 75
- 238000000746 purification Methods 0.000 claims abstract description 35
- 230000007246 mechanism Effects 0.000 claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002808 molecular sieve Substances 0.000 claims abstract description 8
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 51
- 229910052757 nitrogen Inorganic materials 0.000 claims description 21
- 238000001914 filtration Methods 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 12
- 238000000862 absorption spectrum Methods 0.000 claims description 10
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 9
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 239000000725 suspension Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000004817 gas chromatography Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 2
- 238000012031 short term test Methods 0.000 claims 1
- 150000001555 benzenes Chemical class 0.000 abstract description 20
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 abstract description 10
- URLKBWYHVLBVBO-UHFFFAOYSA-N Para-Xylene Chemical group CC1=CC=C(C)C=C1 URLKBWYHVLBVBO-UHFFFAOYSA-N 0.000 abstract description 8
- IVSZLXZYQVIEFR-UHFFFAOYSA-N m-xylene Chemical group CC1=CC=CC(C)=C1 IVSZLXZYQVIEFR-UHFFFAOYSA-N 0.000 abstract description 8
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 abstract description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 5
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 abstract description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 abstract description 4
- 208000028571 Occupational disease Diseases 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000005194 fractionation Methods 0.000 abstract 1
- 238000004321 preservation Methods 0.000 description 4
- 230000009931 harmful effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 229940078552 o-xylene Drugs 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013375 chromatographic separation Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 239000008096 xylene Substances 0.000 description 1
Images
Classifications
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- 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
- G01N30/62—Detectors specially adapted therefor
- G01N30/74—Optical detectors
Abstract
The invention belongs to the technical field of waste gas monitoring, and particularly relates to a method for rapidly determining the content of benzene series components in waste gas of a fixed pollution source, which comprises a detection barrel and an air suction cover arranged at the output end of the detection barrel, wherein the air suction cover is fixed at the bottom of the detection barrel, the bottom end of the detection barrel is provided with a gas purification mechanism for removing impurities, and the top end in the detection barrel is provided with a detection chamber for detecting the benzene series components; through pack molecular sieve and active carbon in gas delivery pipe, can separate the isomer of three kinds of xylol of paraxylene, metaxylene and ortho-xylene completely to can detect benzene, toluene, ethylbenzene, paraxylene, metaxylene, ortho-xylene and styrene simultaneously, the chromatographic fractionation is effectual, and detection efficiency is high, can realize workplace occupational disease harm factor simultaneously and detect, indoor air quality detects and residential quarter atmospheric environment harm factor detects.
Description
Technical Field
The invention belongs to the technical field of waste gas monitoring, and particularly relates to a method for rapidly determining the content of benzene series components in waste gas of a fixed pollution source.
Background
The fixed pollution source is generally a place, equipment and a device which are pointed to the environment to discharge or release harmful substances or have harmful effects on the environment, the air pollution source comprises a fixed pollution source and a flowing pollution source, the fixed pollution source is divided into an organized emission source and an unorganized emission source, the organized emission source refers to a flue, a chimney, an exhaust funnel and the like, the unorganized emission source refers to an unorganized emission facility arranged in an open-air environment or an unorganized emission workshop or a workshop, and exhaust gas emitted by the unorganized emission source contains solid smoke dust and also contains various harmful substances in a gas state and a gas-molten colloid state.
The patent with publication number CN106525998A discloses a method for determining the content of benzene series components in waste gas of a fixed pollution source, which uses a combined light source consisting of an ultraviolet light source and an infrared light source to pass through a detection chamber, and uses a spectrometer to detect the absorption spectrum of a sample gas; the content of the benzene series components is obtained through calculation, but the used equipment is large in size, the fixed pollution sources are usually a flue, a chimney and an exhaust funnel, and the device is not easy to install and can obtain waste gas in time, so that the installation difficulty is increased, the detection difficulty is increased, and certain errors exist.
Disclosure of Invention
To solve the problems set forth in the background art described above. The invention provides a method for rapidly determining the content of benzene series components in waste gas of a fixed pollution source, which aims to solve the problems.
In order to achieve the purpose, the invention provides the following technical scheme: the device for rapidly determining the content of the benzene series components in the waste gas of the fixed pollution source comprises a detection barrel and an air suction cover arranged at the output end of the detection barrel, wherein the air suction cover is fixed at the bottom of the detection barrel, a gas purification mechanism for removing impurities is arranged at the bottom end of the detection barrel, a detection chamber for detecting the benzene series components is arranged at the top end of the detection barrel, the input end of the detection chamber is provided with a plurality of chromatographic columns, a heating chamber for heating is arranged outside the chromatographic columns and the detection chamber, the heating chamber is fixed at the middle position of the top end of the detection barrel, the detection chamber is fixed at the middle position of the detection barrel, a gas accelerating tube and a gas conveying tube for conveying gas are arranged between the gas purification mechanism and the chromatographic columns, a nitrogen bottle corresponding to the number of the gas conveying tubes is fixedly arranged at the top of the detection barrel, and the output end of the nitrogen bottle is fixedly connected with the gas, and an air supply pressure valve is arranged between the nitrogen cylinder and the air delivery pipe, and the air supply pressure valve is fixedly connected with the nitrogen cylinder.
Preferably, the cover of breathing in includes the cover body, inhales fan and fan support, cover body fixed mounting be in detect the bottom of bucket, it is located to inhale the fan the inside intermediate position department of the cover body, fan support is fixed in the inside wall top of the cover body, inhale the fan with fan support fixed connection, inhale fan and external power source electric connection.
Preferably, the detection barrel comprises a barrel body and a heat insulation layer, the barrel body is a hollow barrel body, the heat insulation layer is located on the inner side wall of the barrel body, and the heat insulation layer is fixedly connected with the barrel body.
Preferably, a hanging seat is arranged in the middle of the top of the barrel body and fixedly connected with the barrel body, and a rope hanging hole is formed in the hanging seat.
Preferably, gaseous purification mechanism is including location disk body, purification filtering agent, filter-tank and filter screen, the location disk body is hollow cylinder, the inside packing of location disk body has the purification filtering agent, just be formed with on the purification filtering agent the filter-tank, the tip fixed mounting of filter-tank has the filter screen.
Preferably, the purification filtering agent comprises silica gel, molecular sieve, activated carbon and deoxidizer.
Preferably, the number of the gas accelerating tubes is multiple, the gas accelerating tubes are evenly distributed on the inner side wall of the detection barrel, the number of the gas accelerating tubes corresponds to the number of the filter tanks one by one, and one ends of the gas accelerating tubes are connected with the filter tanks in a sealing mode.
Preferably, the number of the gas conveying pipes is the same as that of the gas accelerating pipes, one end of each gas conveying pipe is connected with the gas accelerating pipes in a sealing mode, and the other end of each gas conveying pipe is connected with the chromatographic column in a sealing mode.
Preferably, the quantity of chromatographic column with the quantity of gas accelerating tube, gas delivery pipe is the same, and every the chromatographic column connects one respectively gas accelerating tube and gas delivery pipe, the nitrogen cylinder with the quantity of gas delivery pipe corresponds, the nitrogen cylinder with pass through between the gas delivery pipe gas supply pressure valve sealing connection.
The detection method of the device for rapidly determining the content of the benzene series components in the waste gas of the fixed pollution source comprises the following steps:
s1, installing equipment at the exhaust end of a chimney of the point to be measured in a hoisting mode, binding and fixing one end of a rope with the suspension seat, fixing the other end of the rope on the hanger, completing installation, sampling air to obtain a sample to be measured, desorbing to obtain a desorbed sample to be measured, and filling a molecular sieve and active carbon in the gas delivery pipe;
step S2, performing gas chromatography, wherein when the sample gas to be detected is exhausted, the sample gas is pumped and pressurized by the air suction cover positioned at the bottom end of the device, purified by the gas purification mechanism and then introduced into the gas accelerating tube for pressurization, the nitrogen bottle at the joint of the gas accelerating tube and the gas conveying tube fills nitrogen into the gas conveying tube through the gas supply pressure valve, and the sample gas is conveyed to the chromatographic column for separation under the carrying of the nitrogen;
step S3, differential spectrum absorption, wherein the sample gas is sent to the chromatographic column for separation and then enters the detection chamber, and then a combined light source consisting of an ultraviolet light source and an infrared light source is used for detecting the absorption spectrum of the sample gas in the infrared and ultraviolet bands by a spectrometer after passing through the detection chamber filled with the sample gas;
and step S4, filtering, amplifying, collecting and calculating the electric signal generated by the spectrometer through data processing, detecting the content of the benzene series components by using the ultraviolet differential absorption spectrum of the ultraviolet light source, simultaneously detecting the water vapor content in the sample gas by jointly using the infrared differential absorption spectrum of the infrared light source, and correcting the detection result of the benzene series components in real time according to the water vapor content to obtain the final content of the benzene series components.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the exhaust gas purification device, the collection assembly for the exhaust gas, the assembly for exhaust gas purification and transmission and the assembly for gas detection are arranged, and the mechanisms are integrated in the detection barrel, when the exhaust gas purification device is used, the detection barrel is only required to be hung at the top of the exhaust funnel, so that the collection and detection of the exhaust gas can be completed, the exhaust gas purification device is small in size and convenient to install, can simultaneously obtain multiple groups of detection data, can discharge the interference of abnormal data, has high accuracy, can be used under high-temperature gas, can accelerate the detection by utilizing the waste heat of the exhaust gas, can exchange heat for the exhaust gas, can reduce the use of self energy, and is more energy-saving and environment-friendly;
2. in addition, the molecular sieve and the activated carbon are filled in the gas conveying pipe, so that isomers of three xylene, namely p-xylene, m-xylene and o-xylene, can be completely separated, benzene, toluene, ethylbenzene, p-xylene, m-xylene, o-xylene and styrene can be detected simultaneously, the chromatographic separation effect is good, the detection efficiency is high, and occupational disease hazard factor detection, indoor air quality detection and residential area atmospheric environment hazard factor detection of workplaces can be realized simultaneously.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view of the present invention;
FIG. 3 is a schematic sectional view taken along line A-A in FIG. 2;
fig. 4 is a schematic structural view of the gas purification mechanism of the present invention.
In the figure: 1. a detection barrel; 11. a barrel body; 12. a heat-insulating layer; 13. a suspension seat; 131. a rope hanging hole; 2. an air intake cover; 21. a cover body; 22. an air suction fan; 23. a fan bracket; 3. a nitrogen gas cylinder; 31. a gas supply pressure valve; 4. a gas purification mechanism; 41. positioning the tray body; 42. purifying the filtering agent; 43. a filter tank; 44. filtering with a screen; 5. a gas acceleration tube; 6. a gas delivery pipe; 7. a heating chamber; 8. a chromatographic column; 9. a detection chamber.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides the following technical solutions: a device for rapidly determining the content of benzene series components in waste gas of a fixed pollution source comprises a detection barrel 1 and an air suction cover 2 installed at the output end of the detection barrel, wherein the air suction cover 2 is fixed at the bottom of the detection barrel 1, a gas purification mechanism 4 for impurity removal is arranged at the bottom end of the detection barrel 1, a detection chamber 9 for detecting the benzene series components is arranged at the top end inside the detection barrel 1, a plurality of chromatographic columns 8 are arranged at the input end of the detection chamber 9, a heating chamber 7 for heating is arranged outside the chromatographic columns 8 and the detection chamber 9, the heating chamber 7 is fixed at the middle position of the top end inside the detection barrel 1, the detection chamber 9 is fixed at the middle position of the detection barrel 1, a gas accelerating tube 5 and a gas conveying tube 6 for conveying gas are arranged between the gas purification mechanism 4 and the chromatographic columns 8, nitrogen bottles 3 corresponding to the number of the gas conveying tubes 6 are fixedly installed at the top of the detection barrel 1, the output end of the nitrogen, and a gas supply pressure valve 31 is arranged between the nitrogen gas bottle 3 and the gas delivery pipe 6, and the gas supply pressure valve 31 is fixedly connected with the nitrogen gas bottle 3.
In the embodiment, the device comprises a detection barrel 1 and an air suction cover 2 installed at the output end of the detection barrel, wherein a gas purification mechanism 4 for removing impurities is arranged at the bottom end of the detection barrel 1, a gas accelerating tube 5 and a gas conveying tube 6 for conveying gas are arranged between the gas purification mechanism 4 and a chromatographic column 8, a heating chamber 7 for heating is arranged outside the chromatographic column 8 and the detection chamber 9, a collection component for discharged waste gas, the gas purification mechanism 4 for purifying and conveying waste gas, the gas accelerating tube 5, the gas conveying tube 6, the chromatographic column 8 and the detection chamber 9 for detecting gas are arranged, the mechanisms are integrated in the detection barrel 1, when the device is used, the detection barrel 1 is only required to be hung at the top of an exhaust barrel, so that the collection and detection of waste gas can be completed, the device is small in size and convenient to install, and can simultaneously obtain a plurality of groups of detection data, the interference that can discharge abnormal data has higher accuracy, and its use under the gas of high temperature, can utilize the waste heat of waste gas to accelerate going on of detection, carries out the heat transfer to waste gas, can reduce the use of self energy, more energy-concerving and environment-protective.
Specifically, the cover 2 of breathing in includes the cover body 21, suction fan 22 and fan support 23, cover body 21 fixed mounting is in the bottom that detects bucket 1, suction fan 22 is located the inside intermediate position department of the cover body 21, fan support 23 is fixed in the inside wall top of the cover body 21, suction fan 22 and fan support 23 fixed connection, suction fan 22 and external power source electric connection, through setting up suction fan 22 and cover body 21, the cover body 21 of horn mouth form can contact more waste gas, do benefit to suction fan 22 and inhale waste gas.
Specifically, detect bucket 1 and include staving 11 and heat preservation 12, staving 11 is hollow staving, and heat preservation 12 is located the inside wall of staving 11, and heat preservation 12 and 11 fixed connection of staving, through setting up heat preservation 12, can reduce inside calorific loss, more energy-conservation.
Specifically, the middle position of the top of the barrel body 11 is provided with the hanging seat 13, the hanging seat 13 is fixedly connected with the barrel body 11, and the hanging seat 13 is provided with the rope hanging hole 131, so that the barrel body 11 is conveniently hung on the top of the chimney, and the installation is convenient.
Specifically, gaseous purification mechanism 4 is including location disk body 41, purification filtering agent 42, filter tank 43 and filter screen 44, location disk body 41 is hollow cylinder, the inside packing of location disk body 41 has purification filtering agent 42, and be formed with filter tank 43 on the purification filtering agent 42, the tip fixed mounting of filter tank 43 has filter screen 44, purification filtering agent 42 includes silica gel, molecular sieve, active carbon and deoxidier, through setting up gaseous purification mechanism 4, can absorb and neutralize the remaining impurity in the waste gas, avoid the unexpected material of benzene series thing to cause the interference to the testing result.
Specifically, the number of the gas accelerating tubes 5 is plural, and the gas accelerating tubes 5 are uniformly distributed on the inner side wall of the detection barrel 1, the number of the gas accelerating tubes 5 corresponds to the number of the filter tanks 43 one by one, one end of each gas accelerating tube 5 is connected with the filter tank 43 in a sealing manner, the number of the gas conveying tubes 6 is the same as the number of the gas accelerating tubes 5, one end of each gas conveying tube 6 is connected with the gas accelerating tube 5 in a sealing manner, the other end of each gas conveying tube 6 is connected with the chromatographic column 8 in a sealing manner, the number of the chromatographic columns 8 is the same as the number of the gas accelerating tubes 5 and the number of the gas conveying tubes 6, each chromatographic column 8 is respectively connected with one gas accelerating tube 5 and one gas conveying tube 6, the nitrogen bottles 3 correspond to the number of the gas conveying tubes 6, the nitrogen bottles 3 are connected with the gas conveying tubes 6 in a sealing manner through the gas supply pressure valves 31, the nitrogen bottles 3 are filled with, under the carrying of nitrogen, the sample gas is sent to the chromatographic column 8 for separation.
A detection method of a device for rapidly determining the content of benzene series components in waste gas of a fixed pollution source comprises the following steps:
step S1, installing the device at the exhaust end of the chimney of the point to be measured in a hoisting mode, binding and fixing one end of a rope with the suspension seat 13, fixing the other end of the rope on the hoisting frame, completing installation, sampling air to obtain a sample to be measured, desorbing to obtain a desorbed sample to be measured, and filling the gas conveying pipe 6 with a molecular sieve and active carbon;
step S2, gas chromatography separation, wherein when the sample gas to be detected is exhausted, the sample gas is pumped and pressurized by the air suction cover 2 at the bottom end of the device, purified by the gas purification mechanism 4 and then introduced into the gas accelerating tube 5 for pressurization, the nitrogen gas bottle 3 at the joint of the gas accelerating tube 5 and the gas conveying tube 6 fills nitrogen gas into the gas conveying tube 6 through the gas supply pressure valve 31, and the sample gas is conveyed to the chromatographic column 8 for separation under the carrying of the nitrogen gas;
step S3, differential spectrum absorption, wherein the sample gas is sent to a chromatographic column 8 for separation and then enters a detection chamber 9, and then a combined light source consisting of an ultraviolet light source and an infrared light source is used for detecting the absorption spectrum of the sample gas in infrared and ultraviolet bands by a spectrometer after passing through the detection chamber 9 filled with the sample gas;
and step S4, filtering, amplifying, collecting and calculating the electric signal generated by the spectrometer through data processing, detecting the content of the benzene series components by using the ultraviolet differential absorption spectrum of the ultraviolet light source, simultaneously detecting the water vapor content in the sample gas by jointly using the infrared differential absorption spectrum of the infrared light source, and correcting the detection result of the benzene series components in real time according to the water vapor content to obtain the final content of the benzene series components.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a device of benzene series composition content in short-term test fixed pollution source waste gas which characterized in that: including detecting bucket (1) and installing cover (2) of breathing in at its output, cover (2) of breathing in is fixed in the bottom of detecting bucket (1), the bottom of detecting bucket (1) is equipped with gas purification mechanism (4) that are used for the edulcoration, the inside top of detecting bucket (1) is equipped with detection room (9) to the detection of benzene series thing composition, the input of detecting room (9) is equipped with a plurality of chromatographic column (8), the outside of chromatographic column (8), detection room (9) is equipped with heating chamber (7) that are used for the heating, heating chamber (7) are fixed in the inside top intermediate position department of detecting bucket (1), detection chamber (9) are fixed in the intermediate position department of detecting bucket (1), be equipped with gas accelerating tube (5) and gas conveyer pipe (6) that are used for transmitting gas between gas purification mechanism (4) and chromatographic column (8), detect the top fixed mounting of bucket (1) have nitrogen cylinder (3) that correspond with gas delivery pipe (6) quantity, the output of nitrogen cylinder (3) with gas delivery pipe (6) fixed connection, just be equipped with between nitrogen cylinder (3) and gas delivery pipe (6) air feed pressure valve (31), air feed pressure valve (31) with nitrogen cylinder (3) fixed connection.
2. The device for rapidly determining the content of the benzene series components in the waste gas of the fixed pollution source according to claim 1, wherein the device comprises: the cover (2) of breathing in is including the cover body (21), the fan (22) and fan support (23) of breathing in, the cover body (21) fixed mounting be in the bottom of detecting bucket (1), the fan (22) of breathing in is located the inside intermediate position department of the cover body (21), fan support (23) are fixed in the inside wall top of the cover body (21), the fan (22) of breathing in with fan support (23) fixed connection, the fan (22) of breathing in and external power source electric connection.
3. The device for rapidly determining the content of the benzene series components in the waste gas of the fixed pollution source according to claim 2, wherein the device comprises: the detection barrel (1) comprises a barrel body (11) and a heat insulation layer (12), the barrel body (11) is a hollow barrel body, the heat insulation layer (12) is located on the inner side wall of the barrel body (11), and the heat insulation layer (12) is fixedly connected with the barrel body (11).
4. The device for rapidly determining the content of the benzene series components in the waste gas of the fixed pollution source according to claim 3, wherein the device comprises: the hanging seat (13) is arranged in the middle of the top of the barrel body (11), the hanging seat (13) is fixedly connected with the barrel body (11), and the hanging seat (13) is provided with a rope hanging hole (131).
5. The device for rapidly determining the content of the benzene series components in the waste gas of the fixed pollution source according to claim 4, wherein the device comprises: gaseous purification mechanism (4) are including location disk body (41), purification filtering agent (42), filter tank (43) and filter screen (44), location disk body (41) are hollow cylinder, the inside packing of location disk body (41) has purification filtering agent (42), just be formed with on purification filtering agent (42) filter tank (43), the tip fixed mounting of filter tank (43) has filter screen (44).
6. The device for rapidly determining the content of the benzene series components in the waste gas of the fixed pollution source according to claim 5, wherein the device comprises: the purification filtering agent (42) comprises silica gel, molecular sieve, active carbon and deoxidizer.
7. The device for rapidly determining the content of the benzene series components in the waste gas of the fixed pollution source according to claim 6, wherein the device comprises: the quantity of gas accelerating tube (5) is a plurality of, and evenly distributed be in detect on the inside wall of bucket (1), the quantity of gas accelerating tube (5) with the quantity one-to-one of filter-tank (43), just the one end of gas accelerating tube (5) with filter-tank (43) sealing connection.
8. The device for rapidly determining the content of the benzene series components in the waste gas of the fixed pollution source according to claim 7, wherein the device comprises: the quantity of gas delivery pipe (6) with the quantity of gas accelerating tube (5) is the same, just the one end of gas delivery pipe (6) with gas accelerating tube (5) sealing connection, the other end with chromatographic column (8) sealing connection.
9. The device for rapidly determining the content of the benzene series components in the waste gas of the fixed pollution source according to claim 8, wherein the device comprises: the quantity of chromatographic column (8) with the quantity of gas accelerating tube (5), gas delivery pipe (6) is the same, and every chromatographic column (8) connects one respectively gas accelerating tube (5) and gas delivery pipe (6), nitrogen cylinder (3) with the quantity of gas delivery pipe (6) corresponds, nitrogen cylinder (3) with pass through between gas delivery pipe (6) gas supply pressure valve (31) sealing connection.
10. The detection method of the device for rapidly determining the content of the benzene series components in the waste gas of the fixed pollution source according to claim 9, characterized in that: the method comprises the following steps:
s1, installing equipment at the exhaust end of a chimney of a point to be measured in a hoisting mode, binding and fixing one end of a rope with the suspension seat (13), fixing the other end of the rope on a hoisting frame, completing installation, sampling air to obtain a sample to be measured, desorbing to obtain a desorbed sample to be measured, and filling a molecular sieve and active carbon in the gas conveying pipe (6);
step S2, performing gas chromatography, wherein when the sample gas to be detected is exhausted, the sample gas is pumped and pressurized by the air suction cover (2) positioned at the bottom end of the device, purified by the gas purification mechanism (4) and then introduced into the gas acceleration tube (5) for pressurization, the nitrogen gas bottle (3) fills nitrogen gas into the gas conveying tube (6) through the gas supply pressure valve (31) at the joint of the gas acceleration tube (5) and the gas conveying tube (6), and the sample gas is conveyed to the chromatographic column (8) for separation under the carrying of the nitrogen gas;
step S3, carrying out differential spectrum absorption, wherein the sample gas is sent to the chromatographic column (8) for separation, then enters the detection chamber (9), and then passes through the detection chamber (9) filled with the sample gas by using a combined light source consisting of an ultraviolet light source and an infrared light source, and then the absorption spectrum of the sample gas in infrared and ultraviolet wave bands is detected by using a spectrometer;
and step S4, filtering, amplifying, collecting and calculating the electric signal generated by the spectrometer through data processing, detecting the content of the benzene series components by using the ultraviolet differential absorption spectrum of the ultraviolet light source, simultaneously detecting the water vapor content in the sample gas by jointly using the infrared differential absorption spectrum of the infrared light source, and correcting the detection result of the benzene series components in real time according to the water vapor content to obtain the final content of the benzene series components.
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