CN109541056A - A kind of device and method that non-methane total hydrocarbons content directly detects - Google Patents
A kind of device and method that non-methane total hydrocarbons content directly detects Download PDFInfo
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- CN109541056A CN109541056A CN201811363331.6A CN201811363331A CN109541056A CN 109541056 A CN109541056 A CN 109541056A CN 201811363331 A CN201811363331 A CN 201811363331A CN 109541056 A CN109541056 A CN 109541056A
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- 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
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- G01N30/64—Electrical detectors
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Abstract
The invention discloses a kind of devices that non-methane total hydrocarbons content directly detects, including a sample gas channel, two carrier gas passages, a quantitative loop, a chromatographic column, multiple-way valve sampling valve, two cylinders and a detector.Under load condition, sample gas removes non-methane total hydrocarbons therein by chromatographic column after being successively filled to two cylinders and is filled to quantitative loop, completes quantitative sampling process.Under sample introduction state, the first carrier gas successively enters detector after the first cylinder, quantitative loop, the second cylinder, obtains the non-methane total hydrocarbons chromatographic peak using background gas as baseline, completes the direct detection of non-methane total hydrocarbons content；Second carrier gas carries out blowback cleaning to chromatographic column.The present invention may be implemented directly to detect non-methane total hydrocarbons under the conditions of single injected sampling, it solves when background non-methane hydrocarbon concentration is far smaller than methane concentration in sample, error detection value caused by minusing is superimposed problem, has many advantages, such as that testing result is accurate, method is reliable and stable.
Description
Technical field
The invention belongs to technical gas detection technique field, in particular to a kind of dress that non-methane total hydrocarbons content directly detects
It sets and method.
Background technique
The concentration of methane and non-methane total hydrocarbons is about 1.8ppmv and 30ppbv in atmosphere.Non-methane total hydrocarbons refers to except methane
All volatilizable hydrocarbons (mainly C2-C8) in addition, component is sufficiently complex, it be mainly derived from gasoline combustion,
Waste incineration, solvent evaporation and waste refinement etc..When non-methane total hydrocarbons is more than certain concentration in atmosphere, except directly to human body
It is healthy harmful outer, photochemical fog can also be generated through solar radiation under certain conditions, is caused damages to environment and the mankind.Cause
This, which carries out the monitoring of non-methane total hydrocarbons and control to regions such as surrounding air, factories circle, is highly desirable, wherein " atmosphere is dirty in China
Contaminate object comprehensive discharge standard " non-methane total hydrocarbons factory's circle concentration standard be 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.
Summary of the invention
The present invention provides a kind of device that non-methane total hydrocarbons content directly detects, and it is directly right under the conditions of single injected sampling to realize
Non-methane total hydrocarbons is detected, and is solved when background non-methane hydrocarbon concentration is far smaller than methane concentration in sample, minusing
Caused by error detection value be superimposed problem, have many advantages, such as that testing result is accurate, method is reliable and stable.
Technical scheme is as follows:
A kind of device that non-methane total hydrocarbons content directly detects, including a sample gas channel, two carrier gas passages, one fixed
Measure ring, a chromatographic column, at least one multi-pass sampling valve, the first cylinder, the second cylinder and a detector；
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, sample port is sequentially connected first cylinder, second cylinder, the chromatographic column and institute to sampling valve
It states quantitative loop and forms sample gas channel, sample gas flows through sample gas channel and realizes sampling process；When the multi-pass sample introduction
For valve under sample introduction state, the first carrier gas port is sequentially connected first cylinder/or the second cylinder, the quantitative loop, described
Enter the detector after second cylinder/or the first cylinder and form the first carrier gas passage, the first carrier gas flows through described
First carrier gas passage realizes the detection to non-methane total hydrocarbons content, and it is logical that the second carrier gas port connects the second carrier gas of the chromatographic column formation
Road, the second carrier gas are flowed through after second carrier gas passage purges the chromatographic column and are emptied；
Further include an evacuation port, in the sampling process, enters after the sample gas passes through the sample gas channel described
When detector, second carrier gas enters the evacuation port；Or enter the row after sample gas passes through the sample gas channel
When eating dishes without rice or wine, second carrier gas enters the detector.
Preferably, when the multi-pass sampling valve is one, the multi-pass sampling valve is ten-way valve.
Preferably, control pressurer system is additionally provided in the carrier gas passage.
Preferably, a sampling pump is additionally provided on sample gas channel.
It preferably, further include at least one three-way solenoid valve.Optionally, logical with the sample gas in first carrier gas passage
Road parallel connection intersection is provided with one first three-way solenoid valve；One second three-way solenoid valve, institute are additionally provided on sample gas channel
The second three-way solenoid valve is stated to be placed between the sampling pump and the multi-pass sampling valve.
Preferably, the chromatographic column is packed column or capillary column；When it is packed column, filler is GDX-502
Or 5A molecular sieve.
Preferably, the detector is flame ionization ditector.
It preferably, further include heating module, the heating module is used to directly detect non-methane total hydrocarbons content to described
The component for needing temperature control of device heats.
It preferably, further include vapour lock, the vapour lock is placed in carrier gas passage, enters gas in the detector for adjusting
Flow.
The present invention also provides a kind of devices directly detected using non-methane total hydrocarbons content recited above directly to be examined
The method for surveying non-methane total hydrocarbons content, comprising the following steps:
(1) it samples: switching the multi-pass sampling valve and make it into load condition, make sample gas as background gas to the first gas storage
Pipe is filled with second cylinder, is then passed through the chromatographic column and is removed non-methane total hydrocarbons therein, methane gas pair
The quantitative loop is filled, and completes sampling process；
(2) blowback and non-methane total hydrocarbons detection: switch the multi-pass sampling valve and make it into sample introduction state, described first carries
Gas successively purges first cylinder/or the second cylinder, the quantitative loop, second cylinder/or the first cylinder
Enter the detector afterwards, the non-methane chromatographic peak using background gas as baseline is obtained, it is characterized in that negative peak, is calculated sample gas
In non-methane total hydrocarbons content；Second carrier gas is redirected back into the chromatographic column and carries out blowback, will remain in the chromatographic column
In non-methane total hydrocarbons blow to the evacuation port.
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 background gas in first cylinder and second cylinder and
Methane gas and atmospheric pressure in the quantitative loop balance.
Compared with prior art, beneficial effects of the present invention are as follows:
(1) configuration and structure of analyzer are simplified.Using multi-pass sampling valve, all the way sample gas channel, two carrier gas passages, one
A quantitative loop, a chromatographic column, two cylinders and a detector complete the direct detection of non-methane total hydrocarbons content in sample gas.
(2) it reduces test total time and extends chromatography column life.The invention patent only need by with quantitative loop volume equivalent
Or excessive sample gas introduces chromatographic column, effectively shortens sampling time and blowback time, and little due to introducing sample tolerance,
Chromatographic column load is little, can extend chromatography column life.
Certainly, it implements any of the products of the present invention and 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 invention patent under multi-pass sampling valve load condition, simultaneously
It is also the structural schematic diagram of sampling process；
Fig. 2 is structural schematic diagram of the first embodiment of the invention patent under multi-pass sample introduction valve injection state, simultaneously
It is also the structural schematic diagram of non-methane total hydrocarbons detection and blowback process；
Fig. 3 is structural schematic diagram of second of the embodiment of the invention patent under multi-pass sampling valve load condition；
Fig. 4 is structural schematic diagram of second of the embodiment of the invention patent under multi-pass sample introduction valve injection state；
Marked in the figure: 1- sample port；The first three-way solenoid valve of 2-；The first cylinder of 3-；The second cylinder of 4-；5- chromatography
Column；6- quantitative loop；7- evacuation port；8- detector；The first carrier gas port of 9-；The second carrier gas port of 10-；The control of the first electron pressure of 11-
Device；The second electronic pressure controller of 12-；The second three-way solenoid valve of 13-；14- sampling pump；15- multi-pass sampling valve；A- loads shape
State；B- sample introduction state；Each interface of multi-pass sampling valve 9 is indicated respectively with A0 to A9.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate this hair
It is bright, rather than limit the scope of protection of the present invention.What those skilled in the art made according to the present invention in practical applications changes
Into and adjustment, still fall within protection scope of the present invention.
In order to better illustrate the present invention, the present invention is described in detail below with attached drawing.
A kind of device that non-methane total hydrocarbons content directly detects, including a sample gas channel, two carrier gas passages, one fixed
Measure ring 6, a chromatographic column 5, at least one multi-pass sampling valve 15, the first cylinder 3, the second cylinder 4 and a detector 8；
The multi-pass sampling valve 15 can switch under two working conditions of load condition A and sample introduction state B, when described
For multi-pass sampling valve 15 at load condition A, sample port 1 is sequentially connected first cylinder 3, second cylinder 4, described
Chromatographic column 5 and the quantitative loop 6 form sample gas channel, and sample gas flows through sample gas channel and realizes sampling process；When
For the multi-pass sampling valve 15 at sample introduction state B, the first carrier gas port 9 is sequentially connected first cylinder 3/ or the second cylinder
4, enter the detector 8 after the quantitative loop 6, second cylinder 4/ or the first cylinder 3 and form the first carrier gas passage,
First carrier gas flows through detection of the first carrier gas passage realization to non-methane total hydrocarbons content, and the second carrier gas port 10 connects institute
It states chromatographic column 5 and forms the second carrier gas passage, the second carrier gas flows through second carrier gas passage and blows the chromatographic column 5
It is emptied after sweeping；
Further include an evacuation port 7, in the sampling process, enters after the sample gas passes through the sample gas channel described
When detector 8, second carrier gas enters the evacuation port 7；Or enter after the sample gas passes through the sample gas channel described
When evacuation port, second carrier gas enters the detector 8.
Preferably, when the multi-pass sampling valve 15 is one, the multi-pass sampling valve is ten-way valve.
Preferably, control pressurer system is additionally provided in the carrier gas passage.Preferably, control pressurer system is electronics pressure
Force control system (EPC) is further the first electronic pressure controller 11 and the second electronic pressure controller 12, uses respectively
It is adjusted in the pressure of the first carrier gas 9 and the second carrier gas 10.
Preferably, a sampling pump 14 is additionally provided on sample gas channel.The sampling pump 14 is arranged on sample gas channel,
When multi-pass sampling valve 15 enters load condition, has and sample gas is introduced into the first cylinder 3, the second cylinder 4,5 and of chromatographic column
The sampling action of quantitative loop 6.According to the actual situation, optionally, sampling pump 14 is placed between sample gas 1 and multi-pass sampling valve 15 with just
Pressure mode is sampled, and can also be placed between multi-pass sampling valve 15 and evacuation port 7 and be sampled in a manner of negative pressure extracting.
It preferably, further include at least one three-way solenoid valve.Optionally, one first electricity is additionally provided on sample gas channel
Magnetic triple valve 2, first three-way solenoid valve 2 are placed between the sampling pump 14 and the multi-pass sampling valve 15；Described first
The channel the Yang Qi intersection is provided with one second three-way solenoid valve 13 in carrier gas passage.Specifically, the first three-way solenoid valve
2, the port that the first cylinder 3 is not connected with multi-pass sampling valve 15 is arranged in the three-way solenoid valve 2, for switching into the first storage
The gas source of tracheae 3；In load condition, switching first three-way solenoid valve 2 makes sample port 1 be connected with the first cylinder 3；?
When sample introduction state, the first carrier gas port 9 is made to be connected with the first cylinder 3.Second three-way solenoid valve 13, second three-way solenoid valve
13 are arranged on the sample gas channel, are placed between sampling pump 14 and multi-pass sampling valve 15, cut for realizing sampling with equilibrium function
It changes；Under sampling step, it is connected to sampling pump 14 and multiple-way valve；After sampling, the second three-way solenoid valve 13 of switching keeps sample gas logical
Road is connected with atmosphere, completes the effect of sample gas and atmospheric pressure balance.
Preferably, the chromatographic column 5 is packed column or capillary column；When it is packed column, filler is GDX-502
Or 5A molecular sieve.
Preferably, the detector 8 is flame ionization ditector.
It preferably, further include heating module, the heating module is used to directly detect non-methane total hydrocarbons content to described
The component for needing temperature control of device heats.
It preferably, further include vapour lock, the vapour lock is placed in carrier gas passage, enters gas in the detector for adjusting
Flow.
The present invention also provides a kind of devices directly detected using non-methane total hydrocarbons content recited above directly to be examined
The method for surveying non-methane total hydrocarbons content, comprising the following steps:
(1) it samples: switching the multi-pass sampling valve 15 and make it into load condition A, make sample gas as background gas to first
Cylinder 3 is filled with second cylinder 4, is then passed through the chromatographic column 5 and is removed non-methane total hydrocarbons therein, methane
Gas is filled the quantitative loop 6, completes sampling process；
(2) blowback and non-methane total hydrocarbons detection: switching the multi-pass sampling valve 15 and make it into sample introduction state B, and described the
One carrier gas successively purges first cylinder 3/ or the second cylinder 4, the quantitative loop 6, second cylinder 4/ or the
Entering the detector 8 after one cylinder 3, obtains the non-methane chromatographic peak using background gas as baseline, characteristic peak is negative peak,
The non-methane total hydrocarbons content in sample gas is calculated；Second carrier gas is redirected back into the chromatographic column 5 and carries out blowback, will remain
Non-methane total hydrocarbons in the chromatographic column blows to the evacuation port.Wherein, the background gas in two cylinders is sample gas (total hydrocarbon
Gas), the gas in quantitative loop is methane, the corresponding peak position of methane when sample introduction state, in the quantitative loop 2 that detector detects
In the first cylinder 4, the second cylinder 5 between the peak of sample gas, i.e., to using sample gas background gas as the non-methane total hydrocarbons color of baseline
Spectral peak is detected, and realizes the function directly to non-methane total hydrocarbons content quantitative.
Preferably, further include an equilibrium step between the step (1) and the step (2), switch the multi-pass sample introduction
Valve makes it into load condition A, and so that sample gas channel is connected with atmosphere by the way that a triple valve is arranged, so that first storage
Background gas in tracheae 3 and second cylinder 4 and the methane gas in the quantitative loop 6 and atmospheric pressure balance.
The present invention is by simplifying the configuration and structure of analyzer, using a ten-way valve, all the way sample gas channel, two carrier gas
Non-methane total hydrocarbons content is straight in channel, a quantitative loop, a chromatographic column, two cylinders and a detector completion sample gas
Connect detection.The invention patent only needs that chromatographic column will be introduced with quantitative loop volume equivalent or excessive sample gas, effectively shortens
Sampling time and blowback time, and it is little due to introducing sample tolerance, chromatographic column load is little, can extend chromatography column life.
Multi-pass sampling valve is in the case where loading with two kinds of working conditions of sample introduction, because device composition is (including the first cylinder, the second cylinder, fixed
Amount ring) internal gas flow direction mutually causes the structural union of the direct detection device of non-methane total hydrocarbons content instead there are a variety of groups
Variation is closed, also achievable the invention patent purpose and protection scope of the present invention.
The invention will be further described combined with specific embodiments below.
Specific embodiment 1
Specific embodiment 1 provides the invention patent for testing the detection device and method of non-methane total hydrocarbons content, and ties
It closes Fig. 1 and Fig. 2 gives first specific structure embodiment based on the invention patent.
A kind of direct detection device of non-methane total hydrocarbons content involved in the invention patent includes: a sample gas channel, and two
A carrier gas passage, a quantitative loop 6, a chromatographic column 5, multi-pass sampling valve 15, the first cylinder 3, the second cylinder 4 and one
Detector 8.
The multi-pass sampling valve 15 can loaded and switched under two working conditions of sample introduction.As shown in Figure 1, loading
Under state A, sample port 1 can be made to be sequentially connected the first cylinder 3, the second cylinder 4, chromatographic column 5 and quantitative loop 6；Such as Fig. 2 institute
Show, at sample introduction state B, the first carrier gas can be made successively to purge the first cylinder 3, the storage of quantitative loop 6, second through the first carrier gas port 9
Enter detector 8 after tracheae 4, realizes the detection to non-methane total hydrocarbons content, make the second carrier gas through the second carrier gas port 10 to chromatography
Column 5 empties after carrying out blowback.The multi-pass sampling valve 15 can be single valve, be also possible to more valves.In order to simplify apparatus structure and
Flow path switching, it is preferred that the multi-pass sampling valve 15 is ten-way valve.
Preferably, the detector 8 is flame ionization ditector.
The detection device further comprises:
Sampling pump 14, the sampling pump 14 are arranged on sample gas channel, when multi-pass sampling valve 15 enters load condition, tool
Have by sample gas introduce the first cylinder 3, the second cylinder 4, chromatographic column 5 and quantitative loop 6 sampling action.According to the actual situation,
Optionally, sampling pump 14 is placed between sample gas 1 and multi-pass sampling valve 15 and is sampled in a manner of positive pressure, can also be placed in multi-pass into
It is sampled in a manner of negative pressure extracting between sample valve 15 and evacuation port 7.
First three-way solenoid valve 2, first three-way solenoid valve 2, which is arranged, is not connected with multi-pass sampling valve in the first cylinder 3
15 port, for switching into the gas source of the first cylinder 3.In load condition, switch the three-way solenoid valve make sample gas 1 with
First cylinder 3 is connected.In sample introduction state, the first carrier gas 9 is made to be connected with the first cylinder 3.
Second three-way solenoid valve 13, second three-way solenoid valve 13 are arranged on sample gas channel, be placed in sampling pump 14 with
Between multi-pass sampling valve 15, for realizing the switching of sampling and equilibrium function.Under sampling step, it is connected to sampling pump 14 and multi-pass
Valve；After sampling, switching the three-way solenoid valve makes sample gas channel be connected with atmosphere, completes the work of sample gas and atmospheric pressure balance
With.
Preferably, further including heating module, the heating module is used to heat to the non-methane total hydrocarbons detection device.
Preferably, further including that vapour lock is placed in carrier gas passage, for adjusting the flow for entering gas in detector.
Preferably, further include the first electronic pressure controller 11 and the second electronic pressure controller 12, it is respectively used to pair
The pressure of first carrier gas 9 and the second carrier gas 10 is adjusted.
In the present embodiment, above-mentioned each specific connection type of structure are as follows: sample port 1 and the first carrier gas port 9 pass through the first electromagnetism
It is connected after 2 parallel connection of triple valve with the interface A2 of the first cylinder, multi-pass sampling valve 15, the series connection first pressure control of the first carrier gas port 9
It is connected after device 11 processed with the first three-way solenoid valve 2.Interface A5 is sequentially connected after the second three-way solenoid valve 13, sampling pump 14 and emptying
Mouth 7 connects, and sampling pump 14 is sampled with negative pressure mode, and 6 both ends of quantitative loop are separately connected interface A1 and interface A4, chromatographic column 5
Both ends are separately connected interface A0 and interface A6, are connected after the second carrier gas port 10 series connection second pressure controller 12 with interface A9, the
Two cylinders, 4 both ends are separately connected interface A3 and interface A7, interface A8 connecting detection device 8.
This patent additionally provides the detection method of above-mentioned non-methane total hydrocarbons detection device, comprising the following steps:
(A1) sample: switching multi-pass sampling valve 15 makes it into load condition A as shown in Figure 1, switches the first electromagnetic three-way
Valve 2 is connected to sample gas 1 and the first cylinder 3, the second three-way solenoid valve 13 of switching connection sampling pump 14 and sample gas channel, passes through sampling
Pump 14 is successively filled two cylinders using sample gas as background gas, then passes through chromatographic column 5 and removes non-first therein
Alkane total hydrocarbon, and then quantitative loop 6 is filled, complete quantitative sampling process.In the present embodiment, sample gas is sequentially connected the first storage
Tracheae 3 and the second cylinder 4, sampling pump 14 are worked in the form of negative pressure.
(A2) balance: switching multi-pass sampling valve 15 makes it into load condition A as shown in Figure 1, switches the first electromagnetic three-way
Valve 2 is connected to sample gas 1 and the first cylinder 3, and the second three-way solenoid valve 13 of switching makes sample gas channel be connected with atmosphere, completes two gas storage
The effect of the methane gas in background gas, quantitative loop 6 in pipe and atmospheric pressure balance.
(A3) non-methane total hydrocarbons detects: switching multi-pass sampling valve 15 makes it into sample introduction state B as shown in Figure 2, and first carries
Gas 9 enters detector 8 after successively purging the first cylinder 3, quantitative loop 6, the second cylinder 4, obtains using background gas as baseline
Non-methane chromatographic peak, it is characterized in that negative peak, is calculated the non-methane total hydrocarbons content in sample gas.
(A4) blowback: switching multi-pass sampling valve 15 makes it into sample introduction state B as shown in Figure 2, the second carrier gas 10 reversely into
Enter chromatographic column 5 and carry out blowback, the non-methane total hydrocarbons remained in chromatographic column 5 is blown into evacuation port 7.
In other embodiments, multi-pass sampling valve is under load and two kinds of working conditions of sample introduction, the first cylinder and second
The sequencing of cylinder can change, also achievable the invention patent purpose.Under load condition, sample gas successively passes through
First cylinder, the second cylinder；And under sample introduction state, carrier gas first passes through the second cylinder, rear (quantitative loop is passed through in centre)
By first time cylinder.
In other embodiments, multiple single valve structure combinations can be used to realize for single multi-pass sampling valve, such as lead to one ten
Valve is changed to two six-way valves or an eight ways valve and a four-way valve, also achievable in conjunction with the invention patent flow path designs
The invention patent purpose.
Specific embodiment 2
Specific embodiment 2 combines Fig. 3 and Fig. 4 to provide another implementation of the invention patent in structure；
In Fig. 3 and Fig. 4, non-methane total hydrocarbons detection device includes sample gas 1, the first three-way solenoid valve 2, the first cylinder 3,
Second cylinder 4, chromatographic column 5, quantitative loop 6, evacuation port 7, detector 8, the first carrier gas 9, the second carrier gas 10, the first electron pressure
Controller 11, the second electronic pressure controller 12, the second three-way solenoid valve 13, sampling pump 14 and multi-pass sampling valve 15；
The multi-pass sampling valve 15 is ten-way valve.Sample port 1 successively with sampling pump 14, the second three-way solenoid valve 13, first
Three-way solenoid valve 2, the first cylinder 3, the interface A2 of multi-pass sampling valve 15 are connected, and the sampling pump 14 is adopted in a manner of positive pressure
Sample, the first carrier gas series connection first pressure controller 11 after be connected with the first three-way solenoid valve 2.6 both ends of quantitative loop, which are separately connected, to be connect
Mouth A1 and interface A4,5 both ends of chromatographic column are separately connected interface A0 and interface A7, the second carrier gas 10 series connection second pressure controller 12
It is connected afterwards with interface A9,4 both ends of the second cylinder are separately connected interface A3 and interface A6, interface A5 connecting detection device 8, interface A8
Connect exhaust outlet.
In the present embodiment, when multi-pass sampling valve 15 is in load condition A, sample gas is sequentially filled the first cylinder 3, second
Enter detector 8 after cylinder 4, chromatographic column 5, quantitative loop 6.
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.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment
All details are described, are not limited the invention to the specific embodiments described.Obviously, according to the content of this specification,
It can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to better explain the present invention
Principle and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is only
It is limited by claims and its full scope and equivalent.
Claims (11)
1. a kind of device that non-methane total hydrocarbons content directly detects, which is characterized in that including a sample gas channel, two carrier gas are logical
Road, a quantitative loop, a chromatographic column, at least one multi-pass sampling valve, the first cylinder, the second cylinder and a detection
Device；
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, sample port is sequentially connected first cylinder, second cylinder, the chromatographic column and described fixed to valve
Amount ring forms sample gas channel, and sample gas flows through sample gas channel and realizes sampling process；When the multi-pass sampling valve exists
Under sample introduction state, the first carrier gas port is sequentially connected first cylinder/or the second cylinder, the quantitative loop, described second
Enter the detector after cylinder/or the first cylinder and form the first carrier gas passage, the first carrier gas flows through described first
Carrier gas passage realizes the detection to non-methane total hydrocarbons content, and the second carrier gas port connects the chromatographic column and forms the second carrier gas passage,
Second carrier gas is flowed through after second carrier gas passage purges the chromatographic column and is emptied；
Further include an evacuation port, in the sampling process, the detection is entered after the sample gas is by the sample gas channel
When device, second carrier gas enters the evacuation port；Or enter the evacuation port after sample gas passes through the sample gas channel
When, second carrier gas enters the detector.
2. the device that non-methane total hydrocarbons content according to claim 1 directly detects, which is characterized in that when the multi-pass into
When sample valve is one, the multi-pass sampling valve is ten-way valve.
3. the device that non-methane total hydrocarbons content according to claim 1 directly detects, which is characterized in that the carrier gas passage
On be additionally provided with control pressurer system.
4. the device that non-methane total hydrocarbons content according to claim 1 directly detects, which is characterized in that sample gas channel
On be additionally provided with a sampling pump.
5. the device that non-methane total hydrocarbons content according to claim 4 directly detects, which is characterized in that further include at least one
A three-way solenoid valve.
6. the device that non-methane total hydrocarbons content according to claim 1 directly detects, which is characterized in that the chromatographic column is
Packed column or capillary column；When it is packed column, filler is GDX-502 or 5A molecular sieve.
7. the device that non-methane total hydrocarbons content according to claim 1 directly detects, which is characterized in that the detector is
Flame ionization ditector.
8. the device that non-methane total hydrocarbons content according to claim 1 directly detects, which is characterized in that further include heated mould
Block.
9. the device that non-methane total hydrocarbons content according to claim 1 directly detects, which is characterized in that it further include vapour lock,
The vapour lock is placed in carrier gas passage, for adjusting the flow into gas in the detector.
10. a kind of device directly detected using non-methane total hydrocarbons content described in claim 1 carries out directly detection non-methane
The method of total hydrocarbon content, comprising the following steps:
(1) sample: switching the multi-pass sampling valve and make it into load condition, make sample gas as background gas to the first cylinder and
Second cylinder is filled, and is then passed through the chromatographic column and is removed non-methane total hydrocarbons therein, methane gas is to described
Quantitative loop is filled, and completes sampling process；
(2) blowback and non-methane total hydrocarbons detection: switching the multi-pass sampling valve and make it into sample introduction state, first carrier gas according to
Secondary purging first cylinder/or the second cylinder, the quantitative loop, second cylinder/or the first cylinder are laggard
Enter the detector, obtain the non-methane chromatographic peak using background gas as baseline, it is characterized in that negative peak, is calculated in sample gas
Non-methane total hydrocarbons content；Second carrier gas is redirected back into the chromatographic column and carries out blowback, will remain in the chromatographic column
Non-methane total hydrocarbons blows to the evacuation port.
11. according to the method described in claim 10, it is characterized in that, further including between the step (1) and the step (2)
One equilibrium step, by be arranged a triple valve so that sample gas channel is connected with atmosphere so that first cylinder with it is described
The methane gas and atmospheric pressure balance in background gas and the quantitative loop in second cylinder.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113155988A (en) * | 2020-12-31 | 2021-07-23 | 杭州谱育科技发展有限公司 | Non-methane total hydrocarbon detection system and method based on single valve |
| CN114354791A (en) * | 2021-12-29 | 2022-04-15 | 杭州谱育科技发展有限公司 | Detection system and method for non-methane total hydrocarbons |
| WO2022126795A1 (en) * | 2020-12-17 | 2022-06-23 | 广州禾信仪器股份有限公司 | Portable gas chromatography analysis device and analysis method |
| CN114755349A (en) * | 2022-06-14 | 2022-07-15 | 四川晟实科技有限公司 | Automatic analysis system and method for low-temperature double-column chromatography of atmospheric volatile organic compounds |
| CN117054511A (en) * | 2023-10-13 | 2023-11-14 | 杭州盈创环境科技有限公司 | Non-methane total hydrocarbon detection device and method based on double detectors |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58210562A (en) * | 1982-05-31 | 1983-12-07 | Shimadzu Corp | Method and apparatus for determining methane and non-methane hydrocarbons |
| CN202330380U (en) * | 2011-10-27 | 2012-07-11 | 上海仪盟电子科技有限公司 | Gas chromatograph for non-methane hydrocarbon measurement |
| CN104849374A (en) * | 2015-06-11 | 2015-08-19 | 广东俐峰环保科技有限公司 | Non-methane hydrocarbon analysis equipment and method |
| CN207516315U (en) * | 2017-11-14 | 2018-06-19 | 杭州春来科技有限公司 | Non-methane total hydrocarbons detection device |
-
2018
- 2018-11-15 CN CN201811363331.6A patent/CN109541056A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58210562A (en) * | 1982-05-31 | 1983-12-07 | Shimadzu Corp | Method and apparatus for determining methane and non-methane hydrocarbons |
| CN202330380U (en) * | 2011-10-27 | 2012-07-11 | 上海仪盟电子科技有限公司 | Gas chromatograph for non-methane hydrocarbon measurement |
| CN104849374A (en) * | 2015-06-11 | 2015-08-19 | 广东俐峰环保科技有限公司 | Non-methane hydrocarbon analysis equipment and method |
| CN207516315U (en) * | 2017-11-14 | 2018-06-19 | 杭州春来科技有限公司 | Non-methane total hydrocarbons detection device |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022126795A1 (en) * | 2020-12-17 | 2022-06-23 | 广州禾信仪器股份有限公司 | Portable gas chromatography analysis device and analysis method |
| CN113155988A (en) * | 2020-12-31 | 2021-07-23 | 杭州谱育科技发展有限公司 | Non-methane total hydrocarbon detection system and method based on single valve |
| CN114354791A (en) * | 2021-12-29 | 2022-04-15 | 杭州谱育科技发展有限公司 | Detection system and method for non-methane total hydrocarbons |
| CN114354791B (en) * | 2021-12-29 | 2024-04-09 | 杭州谱育科技发展有限公司 | System and method for detecting non-methane total hydrocarbons |
| CN114755349A (en) * | 2022-06-14 | 2022-07-15 | 四川晟实科技有限公司 | Automatic analysis system and method for low-temperature double-column chromatography of atmospheric volatile organic compounds |
| CN114755349B (en) * | 2022-06-14 | 2022-09-02 | 四川晟实科技有限公司 | Automatic analysis system and method for low-temperature double-column chromatography of atmospheric volatile organic compounds |
| CN117054511A (en) * | 2023-10-13 | 2023-11-14 | 杭州盈创环境科技有限公司 | Non-methane total hydrocarbon detection device and method based on double detectors |
| CN117054511B (en) * | 2023-10-13 | 2024-01-12 | 杭州盈创环境科技有限公司 | Non-methane total hydrocarbon detection device and method based on double detectors |
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