CN105929032A - On-line monitoring system for non-methane total hydrocarbons - Google Patents
On-line monitoring system for non-methane total hydrocarbons Download PDFInfo
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- CN105929032A CN105929032A CN201610108944.XA CN201610108944A CN105929032A CN 105929032 A CN105929032 A CN 105929032A CN 201610108944 A CN201610108944 A CN 201610108944A CN 105929032 A CN105929032 A CN 105929032A
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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
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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
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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
- G01N2030/022—Column chromatography characterised by the kind of separation mechanism
- G01N2030/025—Gas chromatography
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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
- G01N2030/8809—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86 analysis specially adapted for the sample
- G01N2030/884—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86 analysis specially adapted for the sample organic compounds
- G01N2030/8854—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86 analysis specially adapted for the sample organic compounds involving hydrocarbons
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Abstract
The invention provides an on-line monitoring system for non-methane total hydrocarbons. The system includes a pretreatment system, an analysis system and a transmission system. The pretreatment system comprises a sampling pipe and a back flushing system; the back flushing system is connected to the sampling pipe, and can clean the sampling pipe; a sample gas enters the analysis system through the sampling pipe; the the analysis system includes at least one chromatographic column for analyzing non-methane total hydrocarbons in the sample gas; and the analysis system is electrically connected to the transmission system and can transmit the analysis data obtained by the analysis system to the outside through the transmission system.
Description
Technical field
The invention belongs to NMHC monitoring field, more particularly it relates to a kind of NMHC on-line monitoring gas chromatogram total system.
Background technology
Gas chromatograph is to carry out biased sample separating the device analyzing detection, including air-channel system, sampling system, piece-rate system, circuit control system, detecting system, data acquisition and processing system.In gas chromatograph, carrier gas carries the sample to be separated by the fixing phase in chromatographic column, make each Component seperation in sample, then detect respectively through detector, by peak height or the area of component each in data acquisition system to sample, through being calculated the content needing component.
Problem existence some problem following of this method:
1, carrier gas often contains background hydro carbons, thus the sensitivity of detector can be reduced；
2, containing substantial amounts of air in sample, wherein oxygen can produce interference to it through detector, occurs that Interference Peaks can quantitatively produce the biggest error, final reduction testing result accuracy to the cutting of peak shape with final.
3, part carbon more than five component can be produced when analyzing total hydrocarbon and retain by glass microsphere post, makes detection obtain total hydrocarbon content on the low side, affects the accuracy of final result.
Normally only gathering a certain region when gathering sample gas the most in the prior art, or gathered respectively in each region and calculate respectively, finally collect the average taking testing result as final result, the method not only bothers but also it cannot be guaranteed that the accuracy of result and objectivity.And the sample gas in current techniques gathers pipeline and the most do not includes blowback system, answer this when sample gas collection pipeline is contaminated, the accuracy of sample gas testing result can be affected.
In addition, need manual record analysis to collect after prior art obtains testing result, then transmit the result to relevant departments, this way is on the one hand it cannot be guaranteed that testing result is monitored in real time, on the other hand, artificial treatment testing result takes time and effort, and causes testing cost higher.
Therefore, those skilled in the art urgently invent a kind of NMHC on-line monitoring system, thus solve the above-mentioned problems in the prior art.
Summary of the invention
It is an object of the present invention to provide a kind of NMHC on-line monitoring system, described NMHC on-line monitoring system can not only improve the accuracy of the testing result for NMHC, and testing result can real-time Transmission to outside, in order to monitor in real time.
Further object is that a kind of NMHC on-line monitoring system of offer, the sample gas of zones of different can be acquired by described NMHC on-line monitoring system, so that it is guaranteed that the accuracy of sample gas testing result and objectivity.
For reaching above-mentioned purpose, the major technique solution of the present invention is to provide a kind of NMHC on-line monitoring system, described NMHC on-line monitoring system includes preprocessing system, analysis system and transmission system, described preprocessing system includes a sample introduction pipeline and a blowback system, described blowback system is connected with described sample introduction pipeline and can clean described sample introduction pipeline, one sample gas enters described analysis system by described sample introduction pipeline, described analysis system includes at least one chromatographic column, for the NMHC in described sample gas is analyzed, the analytical data transmission extremely outside that described analysis system is electrically connected with described transmission system and described analysis system can be drawn by described transmission system.
Preferably, described sample introduction pipeline in described preprocessing system includes a sample introduction branch road, an analysis valve, a sampling pump and a switch valve successively, described blowback system includes an air air source inlet and a back-flushing valve, wherein said air air source inlet connects described back-flushing valve, described blowback system and described sample introduction branch circuit parallel connection are in described analysis valve, so that described blowback system can carry out forward purging and reverse blow to described sample introduction pipeline.
Further, described sample introduction branch road includes one first sample introduction branch road, one second sample introduction branch road and one the 3rd sample introduction branch road, described first sample introduction branch road, second sample introduction branch road and the 3rd sample introduction branch circuit parallel connection are in described analysis valve, wherein said first sample introduction branch road includes one first injection port and one first sampling valve, described first sampling valve is connected between described first injection port and described analysis valve, described second sample introduction branch road includes one second injection port and one second sampling valve, described second sampling valve is connected between described second injection port and described analysis valve, described 3rd sample introduction branch road includes one the 3rd injection port and one the 3rd sampling valve, described 3rd sampling valve is connected between described 3rd injection port and described analysis valve.
Preferably, in described preprocessing system, described sample gas is omnidistance heat tracing in described sample introduction pipeline.
nullFurther，Described analysis system includes a ten-way valve、One six-way valve、One first chromatographic column、One second chromatographic column、One tertiary color spectrum post、One zero dead volume threeways and a detector，Described ten-way valve has one first carrier gas inlet、One second carrier gas inlet、One sample gas inlet and a valve drain，Described six-way valve has one the 3rd carrier gas inlet and sample gas outlet，Described zero dead volume threeway is connected with described detector，Wherein sample gas sequentially passes through described sample gas inlet and the outlet of described sample gas enters described ten-way valve and described six-way valve，First carrier gas source of the gas can sequentially pass through described ten-way valve by described first carrier gas inlet、Described first chromatographic column、Described second chromatographic column and described zero dead volume threeway，Eventually enter into described detector to detect，Second carrier gas source of the gas can be entered described ten-way valve by described second carrier gas inlet and be gone out from the described valve drain of described ten-way valve，3rd carrier gas source of the gas can sequentially pass through described six-way valve by described 3rd carrier gas inlet、Described tertiary color spectrum post and described zero dead volume threeway，Eventually enter into described detector to detect.
Preferably, described analysis system farther includes one first to take off hydrocarbon cleaning system, one second take off hydrocarbon cleaning system and the 3rd and take off hydrocarbon cleaning system, described first takes off hydrocarbon cleaning system is connected between described first carrier gas source of the gas and described first carrier gas inlet, described second takes off hydrocarbon cleaning system is connected between described second carrier gas source of the gas and described second carrier gas inlet, and the described 3rd takes off hydrocarbon cleaning system is connected between described 3rd carrier gas source of the gas and described 3rd carrier gas inlet.
Further, including high molecular polymer in described first chromatographic column, include carrier 5A molecular sieve in described second chromatographic column, described tertiary color spectrum post is rustless steel inertia pipe.
Preferably, described transmission system includes a built-in industrial computer, and described built-in industrial computer is electrically connected with described analysis system, with receive described analysis system data and by analyzing and processing after transmission extremely described outside.
Further, described outside includes that factory's Control Room and an Environmental Protection Agency, described factory Control Room and described Environmental Protection Agency are electrically connected at described built-in industrial computer simultaneously, in order to receive the described analytical data searching for the transmission of built-in industrial computer simultaneously.
Further, described transmission system also includes that a host computer and a number adopt instrument, described host computer and described number adopt instrument electrical series successively between described built-in industrial computer and described Environmental Protection Agency, and described host computer is had data integration software and is connected with described built-in industrial computer by netting twine or RS485/232, described number is adopted the two ends of instrument and is connected with described host computer by netting twine or RS485/232 respectively, and be connected with described Environmental Protection Agency by GPRS, transmit conveniently and efficiently realizing multiple types data.
Therefore, NMHC on-line monitoring system of the present invention is used can to reach some beneficial effect following:
1, NMHC on-line monitoring system of the present invention is owing to including many group sample introduction branch roads in described preprocessing system, thus ensures the multiformity of gathered sample gas, and then improves the accuracy of testing result.
2, NMHC on-line monitoring system of the present invention is owing to have employed blowback system in described sample introduction pipeline, therefore, it is possible to ensure the cleannes of sample introduction pipeline, so that it is guaranteed that the accuracy of testing result.
3, the described analysis system in NMHC on-line monitoring system of the present invention can disposably detect the methane in sample gas and total hydrocarbon, thus draws the content of non-methane in described sample gas, and detecting step is simple and convenient, result accurately and reliably.
4, the described transmission system in NMHC on-line monitoring system of the present invention can carry out real-time Transmission to the analytical data that described analysis system draws, so that it is guaranteed that monitoring real-time.
5, the analytical data that described analysis system can not only be drawn by the described transmission system in NMHC on-line monitoring system of the present invention transmits to factory's Control Room, moreover it is possible to arranges simultaneously and transmits to Environmental Protection Agency, so that it is guaranteed that the promptness of Environmental Protection Agency's monitoring.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the first preferred embodiment of NMHC on-line monitoring system of the present invention.
Fig. 2 is the workflow schematic diagram of the preprocessing system in the first preferred embodiment of NMHC on-line monitoring system of the present invention.
Fig. 3 is the structural representation under sampling state of the analysis system in the first preferred embodiment of NMHC on-line monitoring system of the present invention.
Fig. 4 is the structural representation under detection state of the analysis system in the first preferred embodiment of NMHC on-line monitoring system of the present invention.
Fig. 5 is the flowage structure schematic diagram of the detection of the analysis system in the first preferred embodiment of NMHC on-line monitoring system of the present invention.
Fig. 6 is the present invention test result schematic diagram according to above preferred embodiment.
Fig. 7 is the structured flowchart of the transmission system in the first preferred embodiment of NMHC on-line monitoring system of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
Fig. 1 is the structural representation of the first preferred embodiment of NMHC on-line monitoring system of the present invention, described NMHC on-line monitoring system is for monitoring the NMHC in sample gas, it is characterized in that, including a preprocessing system A, one analyzes system B and transmission system C, wherein said preprocessing system A includes a sample introduction pipeline and a blowback system, described blowback system is connected with described sample introduction pipeline and can clean described sample introduction pipeline, described sample gas enters described analysis system B by described sample introduction pipeline, described analysis system B includes at least one chromatographic column, for the NMHC in described sample gas is analyzed, described analysis system B is electrically connected with described transmission system C and can be transmitted the analytical data of described analysis system B to outside by described transmission system C.
In detail, the workflow schematic diagram of the described preprocessing system A being illustrated in figure 2 in the first preferred embodiment of NMHC on-line monitoring system of the present invention, described preprocessing system A includes a sample introduction pipeline and a blowback system, and described blowback system is connected and can realize the cleaning of the forward to described sample introduction pipeline and reversely cleans with described sample introduction pipeline.
Described sample introduction pipeline is sequentially connected with a sample introduction branch road, analysis valve 44, sampling pump 46 and a switch valve 48, described blowback system includes air air source inlet 51, back-flushing valve 49, wherein said air air source inlet 51 connects described back-flushing valve 49, described blowback system and described sample introduction branch circuit parallel connection are in described analysis valve, so that described blowback system can carry out forward purging and reverse blow to described sample introduction pipeline.
Further, described sample introduction branch road includes one first sample introduction branch road 41, described first sample introduction branch road 41 includes one first injection port 42 and one first sampling valve 43, and described first sampling valve 43 is connected between described first injection port 42 and described analysis valve 44, for controlling the break-make of sample gas.
As present invention further optimization, described sample introduction branch road also includes one second sample introduction branch road 41 ' and one the 3rd sample introduction branch road 41 "; described first sample introduction branch road the 41, second sample introduction branch road the 41 ', the 3rd sample introduction branch road 41 " it is parallel to described analysis valve 44, for the sample gas of zones of different being carried out collection analysis simultaneously, so that it is guaranteed that the sample multiformity of the sample gas gathered.Specifically, described second sample introduction branch road 41 ' includes one second injection port 42 ' and one second sampling valve 43 ', described 3rd sample introduction branch road 41 ' ' include one the 3rd injection port 42 ' ' and one the 3rd sampling valve 43 ' ', wherein said second injection port 42 ' and described second sampling valve 43 ' connect, described 3rd injection port 42 ' ' and described 3rd sampling valve 43 ' ' connect, thus complete the collection of the sample gas of zones of different.
Preferably, described sample introduction pipeline also includes one first filter 45, and described first filter 45 is connected between described analysis valve 44 and described sampling pump 46, to remove granule foreign in gas.
Further, described sample introduction pipeline also includes that flow meters 47, described effusion meter 47 are connected between described sampling pump 46 and described switch valve 48, to control to enter the amount of gas in described analysis system B.
Further, described effusion meter 47 is embodied as a spinner flowmeter.
Preferably, described blowback system also includes one second filter 50, described second filter 50 is connected between described air air source inlet 51 and described back-flushing valve 49, to remove the impurity in the air entered in described air air source inlet 51, thus ensure impurity that described air will not contain because of itself when purging described sample introduction pipeline and affect purging effect.
Specifically, described air enters described back-flushing valve 49 through described air air source inlet 51 and described second filter 50, when described analysis valve 44 cuts out, described air blows to described sample introduction branch road from described back-flushing valve 49, thus the first half section of described sample introduction pipeline is carried out blowback and sweeps, to ensure described first sample introduction branch road the 41, second sample introduction branch road 41 ', the 3rd sample introduction branch road 41 " the most blocked；When described first samples valve 43, second sampling valve 43 ', 3rd sampling valve 43 " close time, described air blows to described analysis valve 44 from described back-flushing valve 49, and sequentially pass through described first filter 45, described sampling pump 46, described effusion meter 47 and described switch valve 48, thus the second half section of described sample introduction pipeline is just purged, to ensure that the second half section of described sample introduction pipeline is not contaminated, thus ensure the cleannes of described sample introduction pipeline, so that described sample gas will not be affected by the cleannes of described sample introduction pipeline through described analysis system B of described sample introduction pipeline entrance and be reduced the accuracy of the detection of the content of NMHC in described sample gas.
Further, described sample introduction pipeline automatically, regularly just can blown and blowback, to ensure that described sample introduction pipeline is the most blocked and is not contaminated by described blowback system by software control.
Preferably, in the first embodiment of the present invention, described switch valve 48 is embodied as a two-position three-way valve, when described analysis system B and will run sample introduction, described two-position three-way valve switches to connect with described analysis system B, the sample introduction end making described analysis system B forms balance with air, it is ensured that the repeatability of described sample gas sample introduction and the accuracy of data；Described blowback system in described sampling system A carries out blowback when sweeping to the second half section of described sample introduction pipeline, and described two-position three-way valve switches to and described analysis system B disconnects, and makes anti-purging air discharge from described two-position three-way valve.
It is emphasized that in preprocessing system A of the present invention, described sample gas is omnidistance heat tracing in described sample introduction pipeline, it is ensured that the stability of the sample gas gathered, and prevents sample gas from having liquefaction phenomenon to affect the accuracy of sampling, improves testing result accuracy.
In detail, the structural representation under sampling state of the analysis system in the first preferred embodiment of NMHC on-line monitoring system of the present invention it is illustrated in figure 3.It is illustrated in figure 4 the structural representation under detection state of the analysis system in the first preferred embodiment of NMHC on-line monitoring system of the present invention.
Described analysis system B includes a ten-way valve V1, one six-way valve V2, one first chromatographic column 23, one second chromatographic column 24, one tertiary color spectrum post 22, one zero dead volume threeway 25 and detectors 26, described ten-way valve V1 has one first carrier gas inlet 7, one second carrier gas inlet 4, one sample gas inlet 9 and a valve drain 3, described six-way valve V2 has one the 3rd carrier gas inlet 12 and sample gas outlet 16, described zero dead volume threeway 25 is connected with described detector 26, sample gas 20 sequentially passes through described sample gas inlet 9 and described sample gas outlet 16 entrance described ten-way valve V1 and described six-way valve V2.As shown in Figure 4, under detection state, first carrier gas source of the gas 31 can drive described sample gas 20 to sequentially pass through described ten-way valve V1 by described first carrier gas inlet 7, described first chromatographic column 23, described second chromatographic column 24 and described zero dead volume threeway 25, eventually enter into described detector 26 to detect, second carrier gas source of the gas 35 can drive described sample gas 20 entered described ten-way valve V1 by described second carrier gas inlet 4 and gone out from the described valve drain 3 of described ten-way valve V1, 3rd carrier gas source of the gas 38 can drive described sample gas 20 to sequentially pass through described six-way valve V2 by described 3rd carrier gas inlet 12, described tertiary color spectrum post 22 and described zero dead volume threeway 25, eventually enter into described detector 26 to detect.
Therefore, as shown in Figure 4, under detection state, described ten-way valve V1 carries out detection level for methane in sample gas 20 is sent into described detector 26, and before described detector 26 detects, described sample gas 20 has utilized the blowing function of the described valve drain 3 of described ten-way valve V1 and described first chromatographic column 23 and described second chromatographic column 24 that the air in sample gas 20 carries out three times and has separated, thus improve the described air purity by the methane in separating degree, and then the raising described detector 26 of entrance in described sample gas 20.In other words, by repeatedly the air in sample gas 20 being separated, it is possible to avoid the oxygen in sample gas 20 that described detector 26 is produced interference, thus improve the detection sensitivity of described detector 26.
As shown in Figure 3, the most preferred as the present invention, described analysis system B also includes one first quantitative loop 19 and one second quantitative loop 32, and described sample gas 20 sequentially passes through described first quantitative loop 19 and described second quantitative loop 32 during exporting 16 by described sample gas inlet 9 and described sample gas.By described first quantitative loop 19 and described second quantitative loop 32, it is ensured that described sample gas 20 enters described ten-way valve V1 and the amount of described six-way valve V2.
Described analysis system B farther includes one first and takes off hydrocarbon cleaning system 17,1 second and take off hydrocarbon cleaning system 34 and the 3rd and take off hydrocarbon cleaning system 37, described first takes off hydrocarbon cleaning system 17 is connected between described first carrier gas source of the gas 31 and described first carrier gas inlet 7, described second takes off hydrocarbon cleaning system 34 is connected between described second carrier gas source of the gas 35 and described second carrier gas inlet 4, and the described 3rd takes off hydrocarbon cleaning system 37 is connected between described 3rd carrier gas source of the gas 38 and described 3rd carrier gas inlet 12.Hydrocarbon cleaning system 17 is taken off by increasing described first between described first carrier gas source of the gas 31 and described first carrier gas inlet 7, between described second carrier gas source of the gas 35 and described second carrier gas inlet 4, increase described second take off hydrocarbon cleaning system 34 and between described 3rd carrier gas source of the gas 38 and described 3rd carrier gas inlet 12, increase the described 3rd take off hydrocarbon cleaning system 37, it is thus possible to by described first carrier gas source of the gas 31, the hydrocarbon gas removing of trace in second carrier gas source of the gas 35 and described 3rd carrier gas source of the gas 38, thus avoid described first carrier gas source of the gas 31, background hydro carbons in second carrier gas source of the gas 35 and described 3rd carrier gas source of the gas 38 reduces the impact of the sensitivity of described detector 26.
Described analysis system B farther includes first flow control system 18, second flow control system 33 and one the 3rd flow control system 36, wherein said first flow control system 18 is connected to described first and takes off between hydrocarbon cleaning system 17 and described first carrier gas inlet 7, described second flow control system 33 is connected to described second and takes off between hydrocarbon cleaning system 34 and described second carrier gas inlet 4, and described 3rd flow control system 36 is connected to the described 3rd and takes off between hydrocarbon cleaning system 37 and described 3rd carrier gas inlet 12.Further, in the first embodiment of the present invention, described first flow control system 18, described second flow control system 33 and described 3rd flow control system 36 are EPC electronic flow control system.On the premise of described first carrier gas the 31, second carrier gas 35 and described 3rd carrier gas 38 are removed background hydrocarbon gas, by described EPC electronic flow control system, the flow of described first carrier gas the 31, second carrier gas 35 and described 3rd carrier gas 38 is monitored again, it is possible to further ensure that described analysis system B stability in the course of the work and concordance.
Those skilled in the art can be as required to described first carrier gas source of the gas 31, the de-hydrocarbon of the second carrier gas source of the gas 35 and described 3rd carrier gas source of the gas 38 purifies demand and flow-control demand is determined, can optionally or all increase described de-hydrocarbon cleaning system and described flow control system, as long as have employed or the technical scheme of approximation identical with the present invention, solve or the technical problem of approximation identical with the present invention, and reach or the technique effect of approximation identical with the present invention, within broadly falling into protection scope of the present invention, the detailed description of the invention of the present invention is not limited thereto.
One as the present invention is preferred, and in the first embodiment of the present invention, described detector 26 for flame ionization ditector and includes air intake 29 and a hydrogen inlet 30 respectively.As shown in the figure, described analysis system B farther includes one the 4th and takes off hydrocarbon cleaning system 28 and the 5th and take off hydrocarbon cleaning system 27, described 4th takes off hydrocarbon cleaning system 28 is connected between described air intake 29 and described detector 26, and the described 5th takes off hydrocarbon cleaning system 27 is connected between described hydrogen inlet 30 and described detector 26.In other words, the present invention is to have employed flame ionization ditector to detect the described methane in sample gas 20 and described total hydrocarbon content, and utilized the described 4th to take off hydrocarbon cleaning system 28 and the described 5th before described flame ionization ditector 26 air inlet is lighted a fire to take off hydrocarbon cleaning system 27 and carry out de-hydrocarbon, thus ensure that described detector 26 is when detecting the methane in described sample gas 20 and total hydrocarbon, will not be affected, therefore, it is possible to further ensure that accuracy and the reliability of the testing result of analysis system B of the present invention by the hydrocarbon gas in igniting air inlet.
Including high molecular polymer in it is emphasized that described first chromatographic column 23, include carrier 5A molecular sieve in described second chromatographic column 24, described tertiary color spectrum post 22 is rustless steel inertia pipe.Wherein said first chromatographic column 23 is for separating air, methane and the component of carbon more than 2 in sample gas 20, described second chromatographic column 24 is for separating the air in sample gas 20 and methane, and the total hydrocarbon composition that described tertiary color spectrum post 22 can be kept completely separate in sample gas 20, without causing the composition of carbon more than 5 in sample gas 20 to be retained by the glass microsphere post in described tertiary color spectrum post 22.Therefore, the total hydrocarbon content in the sample gas 20 that described tertiary color spectrum post 22 separates is unaffected, and ensures that the accuracy of the result of last detection.
In other words, as shown in Figure 3 and Figure 4, described ten-way valve V1 in described analysis system B that the present invention provides includes ten access ports of 1-10, described six-way valve V2 includes six access ports of 11-16, described first chromatographic column 23 and described second chromatographic column 24 are connected with described ten-way valve V1 respectively, described tertiary color spectrum post 22 is connected with described six-way valve V2, and described zero dead volume threeway 25 connects described second chromatographic column 24, described tertiary color spectrum post 22 and described detector 26 respectively.
As shown in Figure 3, under sampling state, sample gas 20 enters described ten-way valve V1 by described sample gas inlet 9, described first quantitative loop 19 is connected again by the 8th interface 8 of described ten-way valve, the first access port 1 again by described ten-way valve enters described ten-way valve V1, then gone out by the tenth access port 10 of described ten-way valve and enter described six-way valve V2 through the 15th access port of described six-way valve, the 14th access port through described six-way valve V2 connects described second quantitative loop 32 and the 11st access port by described six-way valve V2 is again introduced into described six-way valve V2 the most again, described sample gas outlet 16 finally by described six-way valve is gone out.When sample gas 20 enters described ten-way valve V1 and described six-way valve V2 and by described first quantitative loop 19 and described second quantitative loop 32, after cleaning up, described ten-way valve V1 and described six-way valve V2 is switched to as shown in Figure 4.
As shown in Figure 4, under detection state, described first carrier gas 31 was entered described first successively and was taken off hydrocarbon cleaning system 17 and described first flow control system 18, then described ten-way valve V1 is entered by described first carrier gas inlet 7, described first quantitative loop 19 is connected again by the 8th access port 8 in described ten-way valve V1, described ten-way valve V1 is entered again by the first access port 1 in described ten-way valve V1, then described first chromatographic column 23 is connected by described second access port 2 in described ten-way valve V1, described ten-way valve V1 is entered again by the 6th access port 6 in described ten-way valve V1, then described second chromatographic column 24 is connected by the 5th access port 5 in described ten-way valve V1, enter described detector 26 through described zero dead volume threeway 25 again to detect.Air in described sample gas 20, methane and carbon more than 2 component are separated by wherein said first chromatographic column 23, air in described sample gas 20 and methane are separated by described second chromatographic column 24, finally make described detector 26 detect the methane content in sample gas 20.
Similarly, described second carrier gas 35 sequentially passes through described second and takes off hydrocarbon cleaning system 34 and described second flow control system 33, then enters described ten-way valve V1 by described second carrier gas inlet 4, is then discharged by the described valve drain 3 in described ten-way valve V1.Described second carrier gas 35 utilizes the blowing function of the described valve drain 3 of described ten-way valve V1 to separate the air in described sample gas 20 and methane in the process of circulation, only makes methane enter described detector 26.
Described 3rd carrier gas 38 was entered the described 3rd successively and was taken off hydrocarbon cleaning system 37 and described 3rd flow controller 36, described six-way valve V2 is entered again by the 12nd access port 12 of described six-way valve V2, then described second quantitative loop 32 is connected by the 11st access port 11 of described six-way valve V2, described six-way valve V2 is entered again by the 14th access port 14 of described six-way valve V2, then described tertiary color spectrum post 22 is connected by the 13rd access port 13 of described six-way valve V2, it is connected to described detector 26 finally by described zero dead volume threeway 25, carry out detecting total hydrocarbon content.
Finally, the content of the total hydrocarbon in the sample gas 20 measured according to described detector 26 and methane content calculate the content of the NMHC in described sample gas 20.
It is emphasized that in the first embodiment of the present invention, described zero dead volume threeway 25 is zero dead volume 1/16 threeway.Those skilled in the art can determine the composition in the particular type of described zero dead volume threeway 25 and described first chromatographic column the 23, second chromatographic column 24 and tertiary color spectrum post 22 according to practical situation or real needs; as long as with present invention employs identical or approximation technical scheme; solve or the technical problem of approximation identical with the present invention; and reach or the technique effect of approximation identical with the present invention; within belonging to protection scope of the present invention, the detailed description of the invention of the present invention is not limited thereto.
As it is shown in figure 5, the flowage structure of the detection of analysis system in the first preferred embodiment of NMHC on-line monitoring system of the present invention comprises the following steps:
Step one: separate air, methane and the non-methane in sample gas 20, thus detect the methane content in sample gas 20；
Step 2: separate the air in sample gas 20, thus detect the total hydrocarbon content in sample gas 20；
By the NMHC content in the methane content in the sample gas 20 that described detector detects and total hydrocarbon content and calculating sample gas 20, wherein at least the air in sample gas 20 is carried out before described methane content is detected at least three times and separates.
Furthermore, it is necessary to it is emphasized that step one in the detecting step of the detection method of above-mentioned analysis system and step 2 do not have a sequencing, but sample gas 20 is detected simultaneously.
Detecting through described detector 26, the result obtained is such as Fig. 6 and as shown in following table one and table two, for chromatographic peak and content that this is NMHC.
Table one: the chromatographic peak peak area of NMHC
| Ingredient names | 1 peak area PA*S | 2 peak area PA*S | 3 peak area PA*S | 4 peak area PA*S | 5 peak area PA*S | 6 peak area PA*S | RSD% |
| Methane (10.18ppm) | 110.21 | 111.30 | 109.28 | 108.57 | 109.59 | 109.47 | 0.85% |
| Total hydrocarbon (21.71ppm) | 520.17 | 521.38 | 530.87 | 528.28 | 526.67 | 533.21 | 0.98% |
Table two: the chromatographic peak peak height of NMHC
| Ingredient names | 1 peak height PA | 2 peak height PA | 3 peak height PA | 4 peak height PA | 5 peak height PA | 6 peak height PA | RSD% |
| Methane (10.18ppm) | 34.21 | 33.07 | 34.50 | 33.28 | 34.21 | 33.87 | 1.68% |
| Total hydrocarbon (21.71ppm) | 119.54 | 120.21 | 118.67 | 119.02 | 118.90 | 117.42 | 0.79% |
Sensitivity: (being 0.03PA through the noise of measuring FID, 3 times of noises are 0.09PA)
In the present embodiment, the lowest detection of CH_4 detection is limited to: standard gas concentration ÷ (peak height/3 times noise)=10.18 ÷ (33.86/0.09)=0.027ppm
In the present embodiment, the lowest detection of total hydrocarbon detection is limited to: standard gas concentration ÷ (peak height/3 times noise)=21.71 ÷ (118.96/0.09)=0.016ppm(is with methanometer about 0.0117mg/m3)
Therefore, according to relative standard deviation national standard within 3%, the testing result of this practicality gas chromatograph for non-methane hydrocarbon measurement has good collimation, the detection limit of NMHC 0.0117 mg/m3 is far below the 0.14mg/m3 of national Specification simultaneously, it is ensured that the accuracy of result.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
In detail, the structured flowchart of the transmission system being illustrated in figure 7 in the first preferred embodiment of NMHC on-line monitoring system of the present invention.
Described transmission system C includes a built-in industrial computer 61, and described built-in industrial computer 61 is electrically connected with described analysis system B, for receive described analysis system B data and by analyzing and processing after transmission extremely described outside.
Preferably, described outside includes factory's Control Room 71 and an Environmental Protection Agency 72, and described factory Control Room 71 and described Environmental Protection Agency 72 are electrically connected at described built-in industrial computer 61 simultaneously.In other words, the data in described analysis system B can be directly transferred to described factory Control Room 71 and described Environmental Protection Agency 72. by described built-in industrial computer 61 simultaneously
Further, described transmission system C also includes a host computer 62, described host computer 62 is electrically connected between described built-in industrial computer 61 and described Environmental Protection Agency 72, described host computer 62 has data integration software, automatically the data integration can transmitted described built-in industrial computer 61 is form, thus realizes the no worker monitor test of whole system.
Preferably, described host computer 62 is connected with described built-in industrial computer 61 by netting twine or RS485/232, to realize the transmission of multiple types data.
Further, described transmission system C also includes that a number adopts instrument 63, and described number is adopted instrument 63 and is connected between described host computer 62 and described Environmental Protection Agency 72, and described number is adopted and after all data sheets are collected by instrument 63 sent final result to described Environmental Protection Agency 72.
Preferably, described number is adopted the two ends of instrument 63 and is connected with described host computer 62 by netting twine or RS485/232 respectively, is connected with described Environmental Protection Agency 72 by GPRS, it is achieved multiple types data are transmitted conveniently and efficiently.
In sum, NMHC on-line monitoring system of the present invention is used can to reach some beneficial effect following:
1, NMHC on-line monitoring system of the present invention is owing to including many group sample introduction branch roads in described preprocessing system, thus ensures the multiformity of gathered sample gas, and then improves the accuracy of testing result.
2, NMHC on-line monitoring system of the present invention is owing to have employed blowback system in described sample introduction pipeline, therefore, it is possible to ensure the cleannes of sample introduction pipeline, so that it is guaranteed that the accuracy of testing result.
3, the described analysis system in NMHC on-line monitoring system of the present invention can disposably detect the methane in sample gas and total hydrocarbon, thus draws the content of non-methane in described sample gas, and detecting step is simple and convenient, result accurately and reliably.
4, the described transmission system in NMHC on-line monitoring system of the present invention can carry out real-time Transmission to the analytical data that described analysis system draws, so that it is guaranteed that monitoring real-time.
5, the analytical data that described analysis system can not only be drawn by the described transmission system in NMHC on-line monitoring system of the present invention transmits to factory's Control Room, moreover it is possible to arranges simultaneously and transmits to Environmental Protection Agency, so that it is guaranteed that the promptness of Environmental Protection Agency's monitoring.
Claims (10)
1. a NMHC on-line monitoring system, it is characterized in that, described NMHC on-line monitoring system includes preprocessing system, analysis system and transmission system, described preprocessing system includes a sample introduction pipeline and a blowback system, described blowback system is connected with described sample introduction pipeline and can clean described sample introduction pipeline, one sample gas enters described analysis system by described sample introduction pipeline, described analysis system includes at least one chromatographic column, for the NMHC in described sample gas is analyzed, the analytical data transmission extremely outside that described analysis system is electrically connected with described transmission system and described analysis system can be drawn by described transmission system.
NMHC on-line monitoring system the most according to claim 1, it is characterized in that, described sample introduction pipeline in described preprocessing system includes a sample introduction branch road, an analysis valve, a sampling pump and a switch valve successively, described blowback system includes an air air source inlet and a back-flushing valve, wherein said air air source inlet connects described back-flushing valve, described blowback system and described sample introduction branch circuit parallel connection are in described analysis valve, so that described blowback system can carry out forward purging and reverse blow to described sample introduction pipeline.
NMHC on-line monitoring system the most according to claim 2, it is characterized in that, described sample introduction branch road includes one first sample introduction branch road, one second sample introduction branch road and one the 3rd sample introduction branch road, described first sample introduction branch road, second sample introduction branch road and the 3rd sample introduction branch circuit parallel connection are in described analysis valve, wherein said first sample introduction branch road includes one first injection port and one first sampling valve, described first sampling valve is connected between described first injection port and described analysis valve, described second sample introduction branch road includes one second injection port and one second sampling valve, described second sampling valve is connected between described second injection port and described analysis valve, described 3rd sample introduction branch road includes one the 3rd injection port and one the 3rd sampling valve, described 3rd sampling valve is connected between described 3rd injection port and described analysis valve.
NMHC on-line monitoring system the most according to claim 3, it is characterised in that in described preprocessing system, described sample gas is omnidistance heat tracing in described sample introduction pipeline.
null5. according to the NMHC on-line monitoring system according to any one of claim 1-4，It is characterized in that，Described analysis system includes a ten-way valve、One six-way valve、One first chromatographic column、One second chromatographic column、One tertiary color spectrum post、One zero dead volume threeways and a detector，Described ten-way valve has one first carrier gas inlet、One second carrier gas inlet、One sample gas inlet and a valve drain，Described six-way valve has one the 3rd carrier gas inlet and sample gas outlet，Described zero dead volume threeway is connected with described detector，Wherein sample gas sequentially passes through described sample gas inlet and the outlet of described sample gas enters described ten-way valve and described six-way valve，First carrier gas source of the gas can sequentially pass through described ten-way valve by described first carrier gas inlet、Described first chromatographic column、Described second chromatographic column and described zero dead volume threeway，Eventually enter into described detector to detect，Second carrier gas source of the gas can be entered described ten-way valve by described second carrier gas inlet and be gone out from the described valve drain of described ten-way valve，3rd carrier gas source of the gas can sequentially pass through described six-way valve by described 3rd carrier gas inlet、Described tertiary color spectrum post and described zero dead volume threeway，Eventually enter into described detector to detect.
NMHC on-line monitoring system the most according to claim 5, it is characterized in that, described analysis system farther includes one first to take off hydrocarbon cleaning system, one second take off hydrocarbon cleaning system and the 3rd and take off hydrocarbon cleaning system, described first takes off hydrocarbon cleaning system is connected between described first carrier gas source of the gas and described first carrier gas inlet, described second takes off hydrocarbon cleaning system is connected between described second carrier gas source of the gas and described second carrier gas inlet, and the described 3rd takes off hydrocarbon cleaning system is connected between described 3rd carrier gas source of the gas and described 3rd carrier gas inlet.
NMHC on-line monitoring system the most according to claim 6, it is characterised in that include high molecular polymer in described first chromatographic column, includes carrier 5A molecular sieve in described second chromatographic column, described tertiary color spectrum post is rustless steel inertia pipe.
NMHC on-line monitoring system the most according to claim 7, it is characterized in that, described transmission system includes a built-in industrial computer, and described built-in industrial computer is electrically connected with described analysis system, with receive described analysis system analytical data and by analyzing and processing after transmission extremely described outside.
NMHC on-line monitoring system the most according to claim 8, it is characterized in that, described outside includes factory's Control Room and an Environmental Protection Agency, described factory Control Room and described Environmental Protection Agency are electrically connected at described built-in industrial computer simultaneously, in order to receive the described analytical data searching for the transmission of built-in industrial computer simultaneously.
NMHC on-line monitoring system the most according to claim 9, it is characterized in that, described transmission system also includes that a host computer and a number adopt instrument, described host computer and described number adopt instrument electrical series successively between described built-in industrial computer and described Environmental Protection Agency, and described host computer is had data integration software and is connected with described built-in industrial computer by netting twine or RS485/232, described number is adopted the two ends of instrument and is connected with described host computer by netting twine or RS485/232 respectively, and be connected with described Environmental Protection Agency by GPRS, transmit conveniently and efficiently realizing multiple types data.
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