CN105954452A - On-line detection apparatus of non-methane hydrocarbon and detection method thereof - Google Patents
On-line detection apparatus of non-methane hydrocarbon and detection method thereof Download PDFInfo
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- CN105954452A CN105954452A CN201610107142.7A CN201610107142A CN105954452A CN 105954452 A CN105954452 A CN 105954452A CN 201610107142 A CN201610107142 A CN 201610107142A CN 105954452 A CN105954452 A CN 105954452A
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- G—PHYSICS
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- 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
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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
An on-line detection apparatus of non-methane hydrocarbon includes a ten-way valve, a six-way valve, a first chromatographic column, a second chromatographic column, a third chromatographic column, a non-dead-volume three-way device, and a detector, wherein the ten-way valve is provided with a first carrier gas inlet, a second carrier gas inlet, a sample gas inlet, and a valve evacuation outlet. The six-way valve is provided with a third carrier gas inlet and a sample gas outlet. The non-dead-volume three-way device is connected to the detector. A sample gas enters the ten-way valve and the six-way valve successively through the sample gas inlet and the sample gas outlet. A first carrier gas finally enters the detector from the first carrier gas inlet successively through the ten-way valve, the first chromatographic column, the second chromatographic column and the non-dead-volume three-way device. A second carrier gas enters the ten-way valve from the second carrier gas inlet and escapes from the valve evacuation outlet of the ten-way valve. A third carrier gas can finally enter the detector from the third carrier gas inlet successively through the six-way valve, the third chromatographic column and the non-dead-volume three-way device.
Description
Technical field
The invention belongs to detection device field gas detected by gas chromatograph, more particularly it relates to a kind of NMHC on-line measuring device and detection method thereof that can improve test structure accuracy and chromatographic column service life can be extended.
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.
Gas chromatograph of the prior art can pass through six-way valve or ten-way valve when carrying out the detection of NMHC, sample introduction obtains the content of methane and the content of total hydrocarbon once or twice, by minusing, the content of total hydrocarbon is deducted the content of methane, obtain the content of NMHC.Following 2 problems of problem existence 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.
Therefore, the NMHC on-line measuring device used in prior art not only can affect the accuracy of testing result during detection, and the chromatographic column life-span in NMHC on-line measuring device can be subject to the biggest interference, even affects the life-span of chromatographic column.So, those skilled in the art urgently invent a kind of NMHC on-line measuring device, 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 measuring device, described NMHC on-line measuring device can improve the accuracy of the testing result for NMHC.
Further object is that a kind of NMHC on-line measuring device of offer, described NMHC on-line measuring device can improve the service life of the chromatographic column in described NMHC on-line measuring device.
nullFor reaching above-mentioned purpose，The major technique solution of the present invention is to provide a kind of NMHC on-line measuring device，Described NMHC on-line measuring device 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.
Further, described NMHC on-line measuring device also includes one first quantitative loop and one second quantitative loop, and described sample gas sequentially passes through described first quantitative loop and described second quantitative loop during being exported by described sample gas inlet and described sample gas.
Preferably, described NMHC on-line measuring device 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, described NMHC on-line measuring device farther includes a first flow control system, a second flow control system and one the 3rd flow control system, wherein said first flow control system is connected to described first and takes off between hydrocarbon cleaning system and described first carrier gas inlet, described second flow control system is connected to described second and takes off between hydrocarbon cleaning system and described second carrier gas inlet, and described 3rd flow control system is connected to the described 3rd and takes off between hydrocarbon cleaning system and described 3rd carrier gas inlet.
Preferably, described first flow control system, described second flow control system and described 3rd flow control system are EPC electronic flow control system.
Specifically, described detector is for flame ionization ditector and to include an air intake and a hydrogen inlet respectively.
As preferably, described NMHC on-line measuring device farther includes one the 4th and takes off hydrocarbon cleaning system and the 5th and take off hydrocarbon cleaning system, described 4th takes off hydrocarbon cleaning system is connected between described air intake and described detector, and the described 5th takes off hydrocarbon cleaning system is connected between described hydrogen inlet and described detector.
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.
In addition, further object is that the detection method that a kind of NMHC on-line checking is provided, the detection method of described NMHC on-line checking can disposably detect the methane in sample gas and total hydrocarbon, thus draw the content of non-methane in described sample gas, and detecting step is simple and convenient, result accurately and reliably.
For reaching above-mentioned purpose, the major technique solution of the present invention is to provide the detection method of a kind of NMHC on-line checking, and the detection method of described NMHC on-line checking comprises the following steps:
Separate air, methane and the non-methane in sample gas, thus detect the methane content in sample gas；
Separate the air in sample gas, thus detect the total hydrocarbon content in sample gas；
Calculate the NMHC content in sample gas, wherein at least the air in sample gas is carried out before described methane content is detected at least three times and separates.
Therefore, the detection method of NMHC on-line measuring device of the present invention and described NMHC on-line checking is used can to reach some beneficial effect following:
1, NMHC on-line measuring device of the present invention due to detection during by repeatedly the oxygen in sample gas being separated, so that the oxygen eventually entered in detector is completely segregated, therefore, it is possible to the oxygen reduced in described sample gas is for the injury of detector, thus improve the service life of described detector；
2, due to NMHC on-line measuring device of the present invention by single branch road and be with special, be prevented from the chromatographic column that carbon more than five component retained by glass microsphere post in chromatographic column total hydrocarbon detected, thus improve accuracy and the reliability of the testing result of NMHC on-line measuring device of the present invention；
3, the detection method of NMHC on-line checking 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.
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 first preferred embodiment of NMHC on-line measuring device of the present invention structural representation under sampling state.
Fig. 2 is the first preferred embodiment of NMHC on-line measuring device of the present invention structural representation under detection state.
Fig. 3 invents the flowage structure schematic diagram of detection method first preferred embodiment of described NMHC on-line checking.
Fig. 4 is the present invention test result schematic diagram according to above preferred embodiment.
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 first preferred embodiment of NMHC on-line measuring device of the present invention structural representation under sampling state；Fig. 2 is the first preferred embodiment of NMHC on-line measuring device of the present invention structural representation under detection state.As depicted in figs. 1 and 2, present invention generally provides a kind of NMHC on-line measuring device, described NMHC on-line measuring device 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 2, 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 2, 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 the figure, the most preferred as the present invention, described NMHC on-line measuring device 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 NMHC on-line measuring device 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.
As shown in the figure, described NMHC on-line measuring device 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 NMHC on-line measuring device 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 NMHC on-line measuring device 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 by the hydrocarbon gas in igniting air inlet, therefore, it is possible to further ensure that accuracy and the reliability of the testing result of NMHC on-line measuring device of the present invention.
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 depicted in figs. 1 and 2, described ten-way valve V1 in the described NMHC on-line measuring device 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 1, 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 2.
As shown in Figure 2, 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 on figure 3, the first preferred embodiment of the detection method of NMHC on-line checking of the present invention, comprise 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 NMHC on-line checking 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. 4 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 | 111.17 | 110.85 | 110.87 | 111.21 | 0.36% |
| Total hydrocarbon (21.71ppm) | 520.17 | 521.38 | 522.34 | 524.01 | 523.78 | 522.95 | 0.28% |
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) | 33.52 | 33.58 | 33.92 | 33.79 | 33.64 | 33.87 | 0.48% |
| Total hydrocarbon (21.71ppm) | 119.54 | 120.21 | 119.02 | 119.87 | 120.15 | 120.06 | 0.38% |
Sensitivity: (being 0.02PA through the noise of measuring FID, 3 times of noises are 0.06PA)
In the present embodiment, the lowest detection of CH_4 detection is limited to: standard gas concentration ÷ (peak height/3 times noise)=10.18 ÷ (33.72/0.06)=0.018ppm
In the present embodiment, the lowest detection of total hydrocarbon detection is limited to: standard gas concentration ÷ (peak height/3 times noise)=21.71 ÷ (119.80/0.06)=0.011ppm(is with methanometer about 0.0078mg/m3)
Therefore, according to relative standard deviation national standard within 3%, the testing result of this practicality NMHC on-line measuring device has good collimation, simultaneously NMHC 0.0078
The detection limit of mg/m3 is far below the 0.14mg/m3 of national Specification, it is ensured that the accuracy of result.
In sum, the detection method of NMHC on-line measuring device of the present invention and described NMHC on-line checking is used can to reach some beneficial effect following:
1, NMHC on-line measuring device of the present invention due to detection during by repeatedly the oxygen in sample gas being separated, so that the oxygen eventually entered in detector is completely segregated, therefore, it is possible to the oxygen reduced in described sample gas is for the injury of detector, thus improve the service life of described detector；
2, due to NMHC on-line measuring device of the present invention by single branch road and be with special, be prevented from the chromatographic column that carbon more than five component retained by glass microsphere post in chromatographic column total hydrocarbon detected, thus improve accuracy and the reliability of the testing result of NMHC on-line measuring device of the present invention；
3, the detection method of NMHC on-line checking 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.
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.
Claims (9)
- null1. a NMHC on-line measuring device，It is characterized in that，Described NMHC on-line measuring device 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 measuring device the most according to claim 1, it is characterized in that, described NMHC on-line measuring device also includes one first quantitative loop and one second quantitative loop, and described sample gas sequentially passes through described first quantitative loop and described second quantitative loop during being exported by described sample gas inlet and described sample gas.
- NMHC on-line measuring device the most according to claim 2, it is characterized in that, described NMHC on-line measuring device 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 measuring device the most according to claim 3, it is characterized in that, described NMHC on-line measuring device farther includes a first flow control system, one second flow control system and one the 3rd flow control system, wherein said first flow control system is connected to described first and takes off between hydrocarbon cleaning system and described first carrier gas inlet, described second flow control system is connected to described second and takes off between hydrocarbon cleaning system and described second carrier gas inlet, described 3rd flow control system is connected to the described 3rd and takes off between hydrocarbon cleaning system and described 3rd carrier gas inlet.
- NMHC on-line measuring device the most according to claim 4, it is characterised in that described first flow control system, described second flow control system and described 3rd flow control system are EPC electronic flow control system.
- NMHC on-line measuring device the most according to claim 5, it is characterised in that described detector is for flame ionization ditector and to include an air intake and a hydrogen inlet respectively.
- NMHC on-line measuring device the most according to claim 6, it is characterized in that, described NMHC on-line measuring device farther includes one the 4th and takes off hydrocarbon cleaning system and the 5th and take off hydrocarbon cleaning system, described 4th takes off hydrocarbon cleaning system is connected between described air intake and described detector, and the described 5th takes off hydrocarbon cleaning system is connected between described hydrogen inlet and described detector.
- 8. according to the NMHC on-line measuring device according to any one of claim 1-7, it is characterized in that, 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.
- 9. the detection method of a NMHC on-line checking, it is characterised in that the detection method of described NMHC on-line checking comprises the following steps:Separate air, methane and the non-methane in sample gas, thus detect the methane content in sample gas；Separate the air in sample gas, thus detect the total hydrocarbon content in sample gas；Calculate the NMHC content in sample gas, wherein at least the air in sample gas is carried out before described methane content is detected at least three times and separates.
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