CN209471083U - A kind of non-methane total hydrocarbons content detection device - Google Patents
A kind of non-methane total hydrocarbons content detection device Download PDFInfo
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- CN209471083U CN209471083U CN201822166460.8U CN201822166460U CN209471083U CN 209471083 U CN209471083 U CN 209471083U CN 201822166460 U CN201822166460 U CN 201822166460U CN 209471083 U CN209471083 U CN 209471083U
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- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 180
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 179
- 238000001514 detection method Methods 0.000 title claims abstract description 62
- 238000005070 sampling Methods 0.000 claims abstract description 118
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 99
- 239000007789 gas Substances 0.000 claims abstract description 82
- 239000012159 carrier gas Substances 0.000 claims abstract description 60
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims 1
- 238000003556 assay Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 14
- 238000012360 testing method Methods 0.000 description 8
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- -1 C2-C8) Chemical class 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
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- 230000007613 environmental effect Effects 0.000 description 2
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- 206010003497 Asphyxia Diseases 0.000 description 1
- 206010019233 Headaches Diseases 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
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- 231100001243 air pollutant Toxicity 0.000 description 1
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Abstract
The utility model discloses a kind of non-methane total hydrocarbons content detection devices, utility model device includes a sample gas channel, one carrier gas passage, methane quantitative loop, total hydrocarbon quantitative loop, methane chromatographic column, total hydrocarbon chromatographic column, one detector and a multi-pass sampling valve carry out state switching by multi-pass sampling valve, in the loaded state, sample gas is filled methane quantitative loop and total hydrocarbon quantitative loop, it realizes quantitative sampling, while carrier gas blowback methane chromatographic column enters detector after total hydrocarbon chromatographic column, realizes the detection to non-methane total hydrocarbons.Under sample introduction state, carrier gas successively enters detector after methane quantitative loop, methane chromatographic column, total hydrocarbon quantitative loop, total hydrocarbon chromatographic column, successively realizes the detection to total hydrocarbon and methane content in sample gas.It using the technical solution of the utility model, may be implemented to detect non-methane total hydrocarbons using minusing or directly under the conditions of single injected sampling, solve the problems such as existing non-methane total hydrocarbons assay device structures are complicated, the detection used time is longer.
Description
Technical field
The utility model belongs to gas detection technology field, in particular to a kind of non-methane total hydrocarbons content detection device.
Background technique
Methane and non-methane total hydrocarbons are the important generations of nature and mankind's activity, are prevalent in atmosphere.Wherein,
Methane is a kind of greenhouse gases, and greenhouse effects are 25 times bigger than carbon dioxide.When methane concentration is excessively high, oxygen content in air can be made
It is substantially reduced, makes one to suffocate, when Methane in Air reaches 25%-30%, headache, dizzy, out of strength, attention can be caused not to collect
In, situations such as breathing and palpitating quickly, can death by suffocation if separate not in time.
Non-methane total hydrocarbons refers to all volatilizable hydrocarbons (mainly C2-C8), component ten in addition to methane
Divide complexity, it is mainly derived from gasoline combustion, waste incineration, solvent evaporation and waste refinement etc..When non-methane total hydrocarbons in atmosphere
When more than certain concentration, except directly to human health in addition to, can also be generated through solar radiation under certain conditions photochemical
Smog is learned, is caused damages to environment and the mankind.
The concentration of methane and non-methane total hydrocarbons is about 1.8ppmv and 30ppbv in atmosphere, in view of methane in atmosphere and non-first
Various harm of alkane total hydrocarbon, monitoring and control to the regions such as surrounding air, factory circle progress methane, non-methane total hydrocarbons have very much must
It wants, wherein factory's circle concentration standard of the non-methane total hydrocarbons of China " discharge standard of air pollutants " is 5mg/m3。
Ministry of Environmental Protection is about (HJ 38-2017) non-first in surrounding air (HJ 604-2017) and stationary source
The measuring method of alkane total hydrocarbon is gas chromatography, measures non-methane total hydrocarbons content using minusing.I.e. respectively in total hydrocarbon column and first
The total hydrocarbon and methane content in sample gas are measured on alkane column, and total hydrocarbon content is subtracted into methane content and obtains containing for non-methane total hydrocarbons
Amount.
But there is detection error superposition in minusing, i.e., when in sample background non-methane hydrocarbon concentration be far smaller than
When methane concentration, when also namely for methane (CH4) concentration is close to total hydrocarbon (THC) concentration, minusing will cause non-methane total hydrocarbons (NMHC)
Error detection value superposition.Under very low CONCENTRATION STATE, the data error of non-methane total hydrocarbons becomes larger accordingly.Such as work as CTHC=1.4
±0.07mg/m3(in terms of 5% error), CCH4=1.3 ± 0.07mg/m3It (is 1.3mg/m with the atmospheric background value3, 5% error meter)
When, due to CNMHC=CTHC-CCH4, obtain CNMHC=0.1 ± 0.14mg/m3(140% error), it can be seen that non-methane total hydrocarbons
Actual concentrations value is completely within the scope of huge detection error, causes detected value inaccurate.
Number of patent application is the patent of " CN201711122759 " patent name " non-methane total hydrocarbons detection device and method "
A solution is disclosed, a multi-pass sampling valve, all the way carrier gas passage, all the way sample gas channel, two quantitative loops, two are used
A chromatographic column and a fid detector realize the detection to methane, total hydrocarbon in sample gas.Need double sampling that could complete wheel survey
Examination, the process of minusing is to obtain containing for non-methane total hydrocarbons with the methane content that total hydrocarbon content cuts in sample gas 2 in sample gas 1
Amount, but due to cannot be guaranteed the consistency of sample gas constituent content in sampling twice in succession, will affect minusing and calculate non-methane
The accuracy of total hydrocarbon concentration.And an elongated segment pipe of connecting after methane chromatographic column is needed, it avoids going out from methane chromatographic column blowback
The non-methane total hydrocarbons come influences the test result of total hydrocarbon, increases test total time.
Utility model content
The utility model provides a multi-pass sampling valve, all the way carrier gas passage, all the way sample gas channel, two quantitative loops, two
A chromatographic column and a detector complete the detection of total hydrocarbon, methane, non-methane total hydrocarbons content in sample gas.
The technical solution of the utility model is as follows:
A kind of non-methane total hydrocarbons content detection device, including a sample gas channel, a carrier gas passage, two quantitative loops,
Including a methane quantitative loop and a total hydrocarbon quantitative loop, it is successively set on methane chromatographic column in the carrier gas passage, total hydrocarbon
Chromatographic column and the detector being connected with the carrier gas passage, at least one multi-pass sampling valve；
The multi-pass sampling valve can switch under two working conditions of load condition and sample introduction state, when the multi-pass
In the loaded state, two quantitative loops are connected into sample gas channel for quantitative sampling to sampling valve, and sample gas is through sample gas inlet
Enter an exhaust outlet after being filled to methane quantitative loop and total hydrocarbon quantitative loop, methane chromatographic column described in carrier gas blowback is through described total
Enter the detector after hydrocarbon chromatographic column, realizes the detection to non-methane total hydrocarbons；When the multi-pass sampling valve is under sample introduction state,
Two quantitative loops connect the carrier gas passage for detecting, and carrier gas is successively through the methane quantitative loop, the methane chromatography
Enter the detector after column, the total hydrocarbon quantitative loop, the total hydrocarbon chromatographic column, successively realizes and total hydrocarbon in sample gas is contained with methane
The detection of amount.
Preferably, the detector is flame ionization ditector；It is described more when the multi-pass sampling valve is one
Logical sampling valve is ten-way valve, ten two-port valves or ten four-way valves.
Preferably, a control pressurer system is additionally provided in the carrier gas passage, the control pressurer system control enters
The pressure of the carrier gas of chromatographic column.
Preferably, it is additionally provided with a sampling pump on sample gas channel, the sampling pump is placed in sample gas feeder connection and institute
It states and is sampled in a manner of positive pressure between multi-pass sampling valve, or be placed between multi-pass sampling valve and the exhaust outlet with negative pressure extracting
Mode is sampled.
Preferably, it is additionally provided with a three-way solenoid valve on sample gas channel, the three-way solenoid valve is placed in the sampling
Between pump and the multi-pass sampling valve.For realizing the switching of sampling and equilibrium function.Under sampling step, connection sampling pump with
Multi-pass sampling valve；After sampling, switching the three-way solenoid valve makes sample gas channel be connected with atmosphere, completes sample gas and atmospheric pressure
The effect of balance.
It preferably, further include heating module.The heating module is used to need to the non-methane total hydrocarbons content detection device
The component of temperature control is wanted to heat.
It preferably, further include vapour lock, the vapour lock is placed in carrier gas passage, enters gas in the detector for adjusting
Flow.
It preferably, further include extension tube, the extension tube is placed in carrier gas passage, and methane chromatography is placed in load condition
After column and it is located at before multi-pass sampling valve, is used to separate total hydrocarbon chromatographic peak that the detector detects with after in the sample introduction stage
The methane chromatographic peak in face.
The utility model also provides a kind of directly to be detected using non-methane total hydrocarbons content detection device as described above
The method of non-methane total hydrocarbons content, comprising the following steps:
(1) it samples: switching the multi-pass sampling valve and make it into load condition, sample gas is introduced into from sample gas inlet described
It is emptied in methane quantitative loop and the total hydrocarbon quantitative loop and from the exhaust outlet, two quantitative loops realize the sampling to sample gas
Amount is quantified；
(2) total hydrocarbon and CH_4 detection: switch the multi-pass sampling valve and make it into sample introduction state, carrier gas is successively through the first
Enter the detector after alkane quantitative loop, the methane chromatographic column, the total hydrocarbon quantitative loop, the total hydrocarbon chromatographic column, it is successively real
Now to the detection of total hydrocarbon and methane content in sample gas, wherein the sample gas in the methane quantitative loop passes through the methane chromatographic column
Methane and non-methane total hydrocarbons are separated, it is ensured that only methane component enters in detector, and detector successively goes out total hydrocarbon, methane
Chromatographic peak；
(3) blowback methane column: switching the multi-pass sampling valve and make it into load condition, methane chromatography described in carrier gas blowback
The non-methane total hydrocarbons remained in the methane chromatographic column is blown into the detector by column, and detector goes out non-methane total hydrocarbons color
Spectral peak.
This method, which can subtract methane content according to the total hydrocarbon content that detection obtain in step (2) and obtain non-methane total hydrocarbons, to be contained
Amount.Optionally, quantitative calculating can also be carried out to its content according to the non-methane total hydrocarbons chromatographic peak detected in step (3).
It preferably, further include an equilibrium step between the step (1) and the step (2), by the way that a triple valve is arranged
So that sample gas channel is connected with atmosphere so that the sample gas to be measured in the methane quantitative loop, the total hydrocarbon quantitative loop with
Atmospheric pressure balance.
Compared with prior art, the beneficial effects of the utility model are as follows:
(1) configuration and structure of analyzer are simplified: using a multi-pass sampling valve, all the way carrier gas passage, sample gas is logical all the way
Road, two quantitative loops, two chromatographic columns and a detector, single injected sampling are completed total hydrocarbon, methane, non-methane total hydrocarbons in sample gas and are contained
The detection of amount avoids error detection value caused by direct minusing from being superimposed problem, while reducing equipment cost.
(2) facilitate control: there was only carrier gas passage all the way since structure is simplified, so that only needing a control pressurer system
The pressure stable case that carrier gas passage can be realized, increases the reliability of instrument.
(3) reduce test total time: multi-pass sampling valve is completed at the same time sampling, to the anti-of methane chromatographic column in the loaded state
It blows, survey non-methane total hydrocarbons process；Multi-pass sampling valve completes the test process to total hydrocarbon, methane under sample introduction state；Methane and total
Hydrocarbon can realize that chromatographic peak separates, and can be not required to extension tube.And using blowback mode under constant temperature conditions by non-methane total hydrocarbons from first
It is blown out in alkane chromatographic column, not needing additional high temperature can be realized detection.
(4) improve the accuracy of non-methane total hydrocarbons content: environmental protection is supported in the measurement of the utility model patent non-methane total hydrocarbons
The minusing and directly measure two methods that portion requires.Wherein the utility model is detected using primary sampling, can meet difference
Basic demand (the C of subtractionNMHC=CTHC-CCH4)；The folded of minusing directly can avoid to the method that non-methane total hydrocarbons is measured
Add error problem, to improve the test accuracy of low content non-methane total hydrocarbons.
(5) reduce FID baseline fluctuation: multi-pass sampling valve is being loaded under two states of sample introduction in the utility model, is entered
The gross pressure of the carrier gas of detector is consistent with total flow, therefore reduces multi-pass sampling valve FID signal before and after cutting valve to greatest extent
The fluctuation situation of baseline.
Certainly, any product for implementing the utility model does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the first embodiment of the utility model patent under multi-pass sampling valve load condition,
It is simultaneously also sampling, blowback methane chromatographic column and the structural schematic diagram for testing non-methane total hydrocarbons.
Fig. 2 is structural schematic diagram of the first embodiment of the utility model patent under multi-pass sample introduction valve injection state,
It is simultaneously also the structural schematic diagram of analysis total hydrocarbon, methane.
Fig. 3 is the structure connection diagram of second of embodiment of the utility model patent.
Fig. 4 is the structure connection diagram of the third embodiment of the utility model patent.
Marginal data:
1- sample gas inlet；2- methane quantitative loop；3- total hydrocarbon quantitative loop；4- three-way solenoid valve；5- sampling pump；6- exhaust outlet；
7- carrier gas；8- electronic pressure controller；9- methane chromatographic column；10- total hydrocarbon chromatographic column；11- detector；12- multi-pass sampling valve；A-
Load condition；B- sample introduction state；V1, V2- six-way valve；For each interface of ten-way valve respectively with A0 to A9, six-way valve V1's is each
Interface indicates that each interface of six-way valve V2 is indicated respectively with S0 to S5 respectively with P0 to P5.
Specific embodiment
The present invention will be further illustrated below in conjunction with specific embodiments.It should be understood that these embodiments are merely to illustrate
The utility model, rather than limit the protection scope of the utility model.Those skilled in the art are according to this in practical applications
The modifications and adaptations that utility model is made, still fall within the protection scope of the utility model.
In order to better illustrate the utility model, the utility model is described in detail below with attached drawing.
A kind of non-methane total hydrocarbons content detection device, including a sample gas channel, a carrier gas passage, two quantitative loops,
Including a methane quantitative loop 2 and a total hydrocarbon quantitative loop 3, it is successively set on methane chromatographic column 9 in the carrier gas passage, total
Hydrocarbon chromatographic column 10 and the detector 11 being connected with the carrier gas passage, at least one multi-pass sampling valve 12；
The multi-pass sampling valve 12 can switch under two working conditions of load condition A and sample introduction state B, when described
Multi-pass sampling valve is at load condition A, and two quantitative loops are connected into sample gas channel for quantitative sampling, and sample gas is through sample gas
Entrance 1 enters an exhaust outlet 6, methane chromatography described in 7 blowback of carrier gas after being filled to methane quantitative loop 2 and total hydrocarbon quantitative loop 3
Column 9 enters the detector 11 after the total hydrocarbon chromatographic column 10, realizes the detection to non-methane total hydrocarbons；When the multi-pass sample introduction
Valve is at sample introduction state B, and two quantitative loops connect the carrier gas passage for detecting, and carrier gas 7 is successively fixed through the methane
Enter the detector 11 after measuring ring 2, the methane chromatographic column 9, the total hydrocarbon quantitative loop 3, the total hydrocarbon chromatographic column 10, successively
Realize the detection to total hydrocarbon and methane content in sample gas.
The utility model using a multi-pass sampling valve 12, all the way carrier gas passage, all the way sample gas channel, two quantitative loops,
Two chromatographic columns and a detector 11, single injected sampling are completed the detection of total hydrocarbon, methane, non-methane total hydrocarbons content in sample gas, are kept away
Exempt from the superposition problem of error detection value caused by direct minusing, while reducing equipment cost.Multi-pass sampling valve is in load and sample introduction
Under two kinds of working conditions, because device composition internal gas flow direction mutually causes the structure connection side of non-methane total hydrocarbons detection device instead
Formula is there are multiple combinations variation, also achievable the utility model patent purpose.
Multi-pass sampling valve 12 can be individually, ten-way valve or ten two-port valves or ten four-way valves as shown in figure 1,
The combination of multiple single valve structures can be used to realize, such as two six-way valves V1, V2 in Fig. 4 or an eight ways valve and a four-way valve,
In conjunction with the utility model patent flow path designs, also achievable the utility model patent purpose.
A kind of detection method of non-methane total hydrocarbons detection device, it is characterised in that the following steps are included:
(1) sample: switching multi-pass sampling valve makes it into load condition, is drawn sample gas from sample gas inlet 1 by sampling pump 5
Enter in concatenated two quantitative loops (methane quantitative loop 2 and total hydrocarbon quantitative loop 3) and is emptied from exhaust outlet 5, two quantitative loop realities
Now the sampling quantity of sample gas is quantified.
(2) total hydrocarbon and CH_4 detection: switching multi-pass sampling valve makes it into sample introduction state, and carrier gas 7 is successively quantitative to methane
Ring 2, methane chromatographic column 9, total hydrocarbon quantitative loop 3, total hydrocarbon chromatographic column 10 carry out purging and enter flame ionization ditector 11.Its
In, the sample gas in methane quantitative loop 2 is separated methane and non-methane total hydrocarbons by methane chromatographic column 9, it is ensured that only methane
Component enters in detector, and detector successively goes out total hydrocarbon, methane chromatographic peak.
(3) blowback methane column: switching multi-pass sampling valve makes it into load condition, and carrier gas 7 is redirected back into methane chromatographic column 9
Blowback is carried out, the non-methane total hydrocarbons remained in methane chromatographic column 9 is blown into flame ionization ditector 11, detector goes out
Non-methane total hydrocarbons chromatographic peak.
Non-methane total hydrocarbons content calculates in this method: subtracting methane according to the total hydrocarbon content that detection obtains in step (2) and contains
Measure non-methane total hydrocarbons content.Its content can also be quantified according to the non-methane total hydrocarbons chromatographic peak detected in (3) step
It calculates.
It further, further include an equilibrium step between the step (1) and the step (2): switching multi-pass sampling valve
Load condition is made it into, switching three-way solenoid valve 4 makes sample gas channel be connected with atmosphere, completes sample gas and atmospheric pressure balance
Effect.
The utility model is further described combined with specific embodiments below.
Specific embodiment 1
Specific embodiment 1 provides the detection device and method that the utility model patent is used to test non-methane total hydrocarbons content,
And Fig. 1 and Fig. 2 is combined to give first specific structure embodiment based on the utility model patent.
Non-methane total hydrocarbons detection device involved by the utility model patent includes: a sample gas channel, a carrier gas passage,
Methane quantitative loop 2, total hydrocarbon quantitative loop 3, be successively set on methane chromatographic column 9 in carrier gas passage, total hydrocarbon chromatographic column 10 and with
The connected detector 11 of carrier gas passage, the detection device further comprises:
In the present embodiment, in order to simplify apparatus structure and flow path switching, the multi-pass sampling valve 12 is ten-way valve.Referring to figure
1 and Fig. 2, the ten-way valve include 10 interfaces (A0 to A9) altogether.Sample gas inlet 1 is connected with the interface A1 of multi-pass sampling valve 12,
Interface A2 is connect after connecting with methane quantitative loop 2 with interface A6, and interface A5 is connect after connecting with total hydrocarbon quantitative loop 3 with interface A9,
Interface A0 is connect with three-way solenoid valve 4, sampling pump 5 and exhaust outlet 6, and sampling pump 5 is sampled in the form of negative pressure；Carrier gas 7 is connected
It is connected after electronic pressure controller 8 with interface A3, the both ends of methane chromatographic column 9 are separately connected interface A4 and interface A7, interface A8
It is connect after series connection total hydrocarbon chromatographic column 10 with detector 11.
Multi-pass sampling valve 12, the multi-pass sampling valve 12 can loaded and switched over simultaneously under two working conditions of sample introduction
Two quantitative loops are optionally made to be connected into sample gas channel for quantitative sampling, multi-pass sampling valve 12 respectively connects at load condition A
Mouth connection type is interface A1 connector A2, interface A3 connector A4, interface A5 connector A6, interface A7 connector A8, interface
A9 connector A0, in Fig. 1, sample gas is sequentially filled methane quantitative loop 2 and total hydrocarbon quantitative loop 3 through sample gas inlet 1, and realization is quantitatively adopted
Sample；At sample introduction state B, each interface connection type is interface A0 connector A1, interface A2 connector A3, connects multi-pass sampling valve 12
Mouth A4 connector A5, interface A6 connector A7, interface A8 connector A9 use two quantitative loops connection carrier gas passages in Fig. 2
In detection, wherein when two quantitative loops are for when detecting, carrier gas 7 to be successively fixed to methane quantitative loop 2, methane chromatographic column 9, total hydrocarbon
Amount ring 3, total hydrocarbon chromatographic column 10 enter detector 11 after being purged and detect to total hydrocarbon and methane content.When two quantitative loops
When for quantitative sampling, in load condition A, carrier gas 7 is redirected back into methane chromatographic column 9 and carries out blowback simultaneously to it multi-pass sampling valve 12
Enter flame ionization ditector 11 after total hydrocarbon chromatographic column 10 to detect non-methane total hydrocarbons content.
Three-way solenoid valve 4, the three-way solenoid valve 4 are arranged on sample gas channel, are placed in sampling pump 5 and multi-pass sampling valve 12
Between, for realizing the switching of sampling and equilibrium function.Under sample states, connection sampling pump 5 and multiple-way valve；Sampling terminates
Afterwards, switching three-way solenoid valve makes sample gas channel be connected with atmosphere, completes the effect of sample gas and atmospheric pressure balance.
Preferably, further including heating module, the heating module is used to need to the non-methane total hydrocarbons detection device
The component of temperature control heats.
Preferably, further including that vapour lock is placed in carrier gas passage, enter gas in flame ionization ditector for adjusting
The flow of body.
As optional, further include that extension tube is placed in carrier gas passage, is placed in load condition after methane chromatographic column 9,
Before multi-pass sampling valve 12, the total hydrocarbon chromatographic peak and subsequent methane chromatography that separation detection device 11 detects are used in the sample introduction stage
Peak.
Multi-pass sampling valve is being loaded under two kinds of working conditions of sample introduction, is mutually caused instead because device composition internal gas flows to
The structural union of non-methane total hydrocarbons detection device is there are multiple combinations variation, also achievable the utility model patent purpose.
Multiple single valve structure combinations can be used to realize for single multi-pass sampling valve, such as more by a ten-way valve in embodiment 1
It is changed to two six-way valves or an eight ways valve and a four-way valve, it is also achievable in conjunction with the utility model patent flow path designs
The utility model patent purpose.
The present embodiment additionally provides the detection method using above-mentioned non-methane total hydrocarbons detection device, comprising the following steps:
(A1) sample: switching multi-pass sampling valve makes it into load condition as shown in Figure 1, switches 4 connection of three-way solenoid valve
Sampling pump 5 and multiple-way valve are evacuated by sampling pump 5, and sample gas is introduced concatenated two quantitative loop (methane from sample gas inlet 1
Quantitative loop 2 and total hydrocarbon quantitative loop 3) in and empty from exhaust outlet 5, the realization of two quantitative loops quantifies the sampling quantity of sample gas.
(A2) balance: switching multi-pass sampling valve makes it into load condition as shown in Figure 1, and switching three-way solenoid valve 4 makes sample
Gas channel is connected with atmosphere, completes the effect of sample gas and atmospheric pressure balance.
(A3) total hydrocarbon and CH_4 detection: switching multi-pass sampling valve makes it into sample introduction state as shown in Figure 2, and carrier gas 7 is through electricity
Sub- pressure controller 8 is adjusted with stable pressure successively to methane quantitative loop 2, methane chromatographic column 9, total hydrocarbon quantitative loop 3, total hydrocarbon color
Spectrum column 10 carries out purging and enters flame ionization ditector 11.Wherein, the sample gas in methane quantitative loop 2 passes through methane chromatographic column
9 separate methane and non-methane total hydrocarbons, it is ensured that only methane component enters in detector, and detector successively goes out total hydrocarbon, first
Alkane chromatographic peak.
(A4) blowback methane column: switching multi-pass sampling valve makes it into load condition as shown in Figure 1, and carrier gas 7 is through electronics pressure
Force controller 8, which is adjusted, enters the progress blowback of methane chromatographic column 9 with stable pressure reversal, will remain in methane chromatographic column 9
Non-methane total hydrocarbons is blown into flame ionization ditector 11, and detector goes out non-methane total hydrocarbons chromatographic peak.
(A5) non-methane total hydrocarbons content calculates:
Methane content, which is subtracted, according to the total hydrocarbon content detected in (A3) step obtains non-methane total hydrocarbons content.
Optionally, quantitative calculating can also be carried out to its content according to the non-methane total hydrocarbons chromatographic peak detected in (A4) step.
Accuracy using the non-methane total hydrocarbons content of this method measurement is higher.The utility model is carried out using primary sampling
Detection, can meet the basic demand (C of minusingNMHC=CTHC-CCH4), and the prior art needs double sampling that could complete a wheel
Test, the process of minusing is to cut the methane content in another sample gas with total hydrocarbon content in equally gas to obtain non-methane total hydrocarbons
Content, but due to cannot be guaranteed the consistency of sample gas constituent content in sampling twice in succession, will affect minusing calculate it is non-
The accuracy of methane total hydrocarbon concentration.
Specific embodiment 2
Specific embodiment 2 provides another implementation of the utility model patent in structure in conjunction with Fig. 3；
In Fig. 3, non-methane total hydrocarbons detection device includes sample gas inlet 1, methane quantitative loop 2, total hydrocarbon quantitative loop 3, electromagnetism
Triple valve 4, sampling pump 5, exhaust outlet 6, carrier gas 7, electronic pressure controller 8, methane chromatographic column 9, total hydrocarbon chromatographic column 10, hydrogen flame
Ionization detector 11, multi-pass sampling valve 12.
The multi-pass sampling valve 12 is ten-way valve.Except sampling pump 5 is to be set to sampling channel close to sample gas inlet 1, with just
Outside pressure mode is sampled.Interface A1 phase with multi-pass sampling valve 12 after sample gas inlet 1 is connect with sampling pump 5, three-way solenoid valve 4
Even, interface A0 is connect with exhaust outlet 6, and 3 both ends of total hydrocarbon quantitative loop are separately connected interface A2 and interface A6,9 both ends of methane chromatographic column
It is separately connected interface A3 and interface A8, carrier gas 7 is connected to interface A4,2 both ends of methane quantitative loop point by electronic pressure controller 8
Other connecting interface A5 and interface A9,10 both ends of total hydrocarbon chromatographic column are separately connected interface A7 and flame ionization ditector 11.
When multi-pass sampling valve 12 is in load condition, each interface connection type is interface A1 connector A2, interface A3 connection
Mouth A4, interface A5 connector A6, interface A7 connector A8, interface A9 connector A0, sample gas are sequentially filled total hydrocarbon quantitative loop 3 and first
Alkane quantitative loop 2；For multi-pass sampling valve 12 under sample introduction state, each interface connection type is interface A0 connector A1, interface A2 connection
Mouth A3, interface A4 connector A5, interface A6 connector A7, interface A8 connector A9, carrier gas 7 is successively to methane quantitative loop 2, methane
Chromatographic column 9, total hydrocarbon quantitative loop 3, total hydrocarbon chromatographic column 10 enter detector 11 after being purged and examine to total hydrocarbon and methane content
It surveys；When two quantitative loops are used for quantitative sampling, multi-pass sampling valve 12 is redirected back into methane chromatographic column 9 in load condition, carrier gas 7
Blowback is carried out to it and enters flame ionization ditector 11 after total hydrocarbon chromatographic column 10 examining to non-methane total hydrocarbons content
It surveys.The setting of other structures and connection type are referring to embodiment 1.Details are not described herein again.
The detection method of the non-methane total hydrocarbons detection device formed with the connection type is identical as specific embodiment 1, no longer
It specifically describes.In addition, other preferred structures of the present embodiment are referring to embodiment 1, details are not described herein again.
Specific embodiment 3
Specific embodiment 3 provides another implementation of the utility model patent in structure in conjunction with attached drawing 4；
In Fig. 3, non-methane total hydrocarbons detection device includes sample gas inlet 1, methane quantitative loop 2, total hydrocarbon quantitative loop 3, electromagnetism
Triple valve 4, sampling pump 5, exhaust outlet 6, carrier gas 7, electronic pressure controller 8, methane chromatographic column 9, total hydrocarbon chromatographic column 10, detector
11, multi-pass sampling valve 12.
The multi-pass sampling valve 12 is realized using two six-way valves, is six-way valve V1, V2 respectively.Sampling pump 5 is placed in sampling
Channel is sampled close to exhaust outlet 6 with negative pressure mode.
Sample gas inlet 1 connects P0 interface, and 2 both ends of methane quantitative loop are separately connected P1 interface and S1 interface, and carrier gas 7 passes through electricity
Sub- pressure controller 8 is connected to P2 interface, and 9 both ends of methane chromatographic column are separately connected P3 interface and S2 interface, and P4 interface connects with S5
Mouth is connected, and exhaust outlet 6 passes sequentially through sampling pump 5, three-way solenoid valve 4 is connected with P5 interface, and 3 both ends of total hydrocarbon quantitative loop are separately connected
S0 interface and S4 interface, 10 both ends of total hydrocarbon chromatographic column are separately connected S3 interface and detector 11.
When six-way valve V1 and six-way valve V2 are in load condition, each interface connection type is interface P0 connector P1, interface
P2 connector P3, interface P4 connector P5, interface S0 connect S1, interface S2 connector S3, interface S4 connector S5, and sample gas is successively filled out
Methane quantitative loop 2 and total hydrocarbon quantitative loop 3 are filled, realizes quantitative sampling；When six-way valve V1 and six-way valve V2 are in sample introduction state, respectively connect
Mouth connection type is interface P1 connector P2, interface P3 connector P4, interface P0 connector P5, interface S1 connect S2, interface S3 company
Interface S4, interface S0 connector S5, when two quantitative loops are for when detecting, carrier gas 7 to be successively to methane quantitative loop 2, methane chromatography
Column 9, total hydrocarbon quantitative loop 3, total hydrocarbon chromatographic column 10 enter detector 11 after being purged and detect to total hydrocarbon and methane content；It is more
Logical sampling valve 12 is adjusted to load condition A, and carrier gas 7 is redirected back into methane chromatographic column 9 and carries out blowback to it and through total hydrocarbon chromatographic column 10
Enter flame ionization ditector 11 afterwards to detect non-methane total hydrocarbons content.
The detection method of the non-methane total hydrocarbons detection device formed with the connection type is identical as specific embodiment 1.
The preferred embodiment in the utility model disclosed above is only intended to help to illustrate the utility model.Preferred embodiment is simultaneously
There is no the details that detailed descriptionthe is all, also not limiting the utility model is only the specific embodiment.Obviously, according to this theory
The content of bright book can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to preferably
The principles of the present invention and practical application are explained, so that skilled artisan be enable to better understand and utilize this
Utility model.The utility model is limited only by the claims and their full scope and equivalents.
Claims (8)
1. a kind of non-methane total hydrocarbons content detection device, which is characterized in that including a sample gas channel, a carrier gas passage, two
A quantitative loop, including a methane quantitative loop and a total hydrocarbon quantitative loop, the methane color being successively set in the carrier gas passage
Compose column, total hydrocarbon chromatographic column and the detector being connected with the carrier gas passage, at least one multi-pass sampling valve；
The multi-pass sampling valve can switch under two working conditions of load condition and sample introduction state, when the multi-pass sample introduction
In the loaded state, two quantitative loops are connected into sample gas channel for quantitative sampling to valve, and sample gas is through sample gas inlet to first
Alkane quantitative loop and total hydrocarbon quantitative loop enter an exhaust outlet after being filled, and methane chromatographic column described in carrier gas blowback is through the total hydrocarbon color
Enter the detector after composing column, realizes the detection to non-methane total hydrocarbons；When the multi-pass sampling valve is under sample introduction state, two
The quantitative loop connects the carrier gas passage for detecting, and carrier gas is successively through the methane quantitative loop, the methane chromatographic column, institute
It states and enters the detector after total hydrocarbon quantitative loop, the total hydrocarbon chromatographic column, successively realize to total hydrocarbon in sample gas and methane content
Detection.
2. non-methane total hydrocarbons content detection device according to claim 1, which is characterized in that the detector is hydrogen flame
Ionization detector；When the multi-pass sampling valve is one, the multi-pass sampling valve is ten-way valve, ten two-port valves or ten four-ways
Valve.
3. non-methane total hydrocarbons content detection device according to claim 1, which is characterized in that also set in the carrier gas passage
It is equipped with a control pressurer system, the control pressurer system control enters the pressure of the carrier gas of chromatographic column.
4. non-methane total hydrocarbons content detection device according to claim 1, which is characterized in that the sample gas is also set on channel
It is equipped with a sampling pump, the sampling pump is placed between sample gas feeder connection and the multi-pass sampling valve and is adopted in a manner of positive pressure
Sample, or be placed between multi-pass sampling valve and the exhaust outlet and sampled in a manner of negative pressure extracting.
5. non-methane total hydrocarbons content detection device according to claim 4, which is characterized in that the sample gas is also set on channel
It is equipped with a three-way solenoid valve, the three-way solenoid valve is placed between the sampling pump and the multi-pass sampling valve.
6. non-methane total hydrocarbons content detection device according to claim 1, which is characterized in that further include heating module.
7. non-methane total hydrocarbons content detection device according to claim 1, which is characterized in that it further include vapour lock, the gas
Resistance is placed in carrier gas passage, for adjusting the flow into gas in the detector.
8. non-methane total hydrocarbons content detection device according to claim 1, which is characterized in that it further include extension tube, it is described
Extension tube is placed in carrier gas passage, be placed in load condition after methane chromatographic column and be located at multi-pass sampling valve before, into
The sample stage is used to separate the total hydrocarbon chromatographic peak and subsequent methane chromatographic peak that the detector detects.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109490443A (en) * | 2018-12-21 | 2019-03-19 | 浙江全世科技有限公司 | A kind of non-methane total hydrocarbons content detection device and method |
| CN112240918A (en) * | 2020-11-19 | 2021-01-19 | 华电智控（北京）技术有限公司 | Detection system for non-methane total hydrocarbon and benzene series |
| CN113791133A (en) * | 2021-09-15 | 2021-12-14 | 上海朋环测控技术股份有限公司 | Direct measurement method and detection system for non-methane total hydrocarbons |
| EP3957988A1 (en) * | 2020-08-21 | 2022-02-23 | Synspec B.V. | Method for measuring methane and total non-methane hydrocarbons |
| CN114152704A (en) * | 2021-12-02 | 2022-03-08 | 广东盈峰科技有限公司 | Greenhouse gas methane on-line detection analyzer and detection method |
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2018
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109490443A (en) * | 2018-12-21 | 2019-03-19 | 浙江全世科技有限公司 | A kind of non-methane total hydrocarbons content detection device and method |
| EP3957988A1 (en) * | 2020-08-21 | 2022-02-23 | Synspec B.V. | Method for measuring methane and total non-methane hydrocarbons |
| CN112240918A (en) * | 2020-11-19 | 2021-01-19 | 华电智控（北京）技术有限公司 | Detection system for non-methane total hydrocarbon and benzene series |
| CN113791133A (en) * | 2021-09-15 | 2021-12-14 | 上海朋环测控技术股份有限公司 | Direct measurement method and detection system for non-methane total hydrocarbons |
| CN113791133B (en) * | 2021-09-15 | 2024-03-22 | 上海朋环测控技术股份有限公司 | Direct measurement method and detection system for non-methane total hydrocarbons |
| CN114152704A (en) * | 2021-12-02 | 2022-03-08 | 广东盈峰科技有限公司 | Greenhouse gas methane on-line detection analyzer and detection method |
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