CN108226268A - Gas analyzing apparatus, gas sampling device and analysis method for gases - Google Patents
Gas analyzing apparatus, gas sampling device and analysis method for gases Download PDFInfo
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- CN108226268A CN108226268A CN201710655493.6A CN201710655493A CN108226268A CN 108226268 A CN108226268 A CN 108226268A CN 201710655493 A CN201710655493 A CN 201710655493A CN 108226268 A CN108226268 A CN 108226268A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/626—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using heat to ionise a gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/00584—Control arrangements for automatic analysers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
- G01N35/1009—Characterised by arrangements for controlling the aspiration or dispense of liquids
Abstract
The present invention provides gas analyzing apparatus, gas sampling device and analysis method for gases, even if the pressure of sample air pipeline changes, the concentration of methane or the amount of methane that also can be contained by high-precision measuring sample air.The gas analyzing apparatus (1) includes：Sample air pipeline (11), flows through sample air；Pressure loss mechanism (20) is arranged on the sample air pipeline (11)；Pressure control mechanism (21), by referring to the pressure of the leading portion of the pressure loss mechanism, by a part for the sample air from the back segment discharge of the pressure loss mechanism (20) or to gas as defined in the back segment supply of the pressure loss mechanism (20), the pressure differential of the front and rear sample air pipeline (11) of the pressure loss mechanism (20) is controlled；And the sample air of the sample air pipeline (11) is flowed through in analyzer, analysis.
Description
Technical field
The present invention relates to the gas analyzing apparatus for example analyzed to the ingredient of the sample airs such as the exhaust of automobile and
The gas sampling device being acquired to sample air.
Background technology
For example, as Patent Document 1, in the case where measuring the methane contained by the sample airs such as exhaust, make examination sometimes
Sample gas makes the hydrocarbon other than the methane contained by sample air in non-methane choking device internal combustion by non-methane choking device
It burns.
In the burning, in order to prevent due to oxygen crosses Retained and make methane excessive burning or because oxygen deficiency due to make methane
Hydrocarbon in addition is unburned, needs to supply oxygen in the proper ratio to sample air.
But in this gas analyzing apparatus, for example, because sampling pump pulsation, import sample air pressure oscillation
Deng the flow of sample air is caused to change sometimes.
As a result, because the mixing ratio of sample air and oxygen changes, thus can cause the methane measured concentration and
The problem of amount changes.
This problem can also become problem in other gas analyzing apparatus other than the device for measuring methane.
Existing technical literature
Patent document 1：Flat No. 08-035950 of Japanese Laid-Open Patent Publication
Invention content
The present invention be in view of it is described the problem of and the invention made, the object of the present invention is to provide gas analyzing apparatus or gas
The flow of the sample air of acquisition even if the pressure of sample air pipeline changes, can be also maintained one by body sampler
It is fixed.
That is, the present invention provides a kind of gas analyzing apparatus, including：Sample air pipeline, flows through sample air；Pressure is damaged
It misses a chance structure, is arranged on the sample air pipeline；Pressure control mechanism, by being discharged from the back segment of the pressure loss mechanism
A part for the sample air or to the pressure loss mechanism back segment supply as defined in gas, to control the pressure
Lose the pressure differential of the front and rear sample air pipeline of mechanism；And the sample air pipeline is flowed through in analyzer, analysis
Sample air.
According to such gas analyzing apparatus, because even in the feelings that are changed of pressure of the sample air pipeline
Under condition, also the flow of the sample air of acquisition can be maintained certain, so can accurately analyze contained by sample air
Ingredient.
Even if in addition, in the case of due to being mixed with sample air by operating gas or diluent gas etc.,
Sample air and the mixing ratio of, operating gas or diluent gas etc. can be maintained certain, so can accurately analyze
Ingredient contained by sample air.
As specific embodiment, following gas analyzing apparatus can be enumerated：The pressure control mechanism includes：Examination
Sample gas outlet pipe road, by a part for the sample air after the pressure loss mechanism of the sample air pipeline
Section discharge；Sample pressure adjusts pipeline, is connect with the sample air discharge line；And sample pressure control portion, with reference to institute
The pressure of the leading portion of the pressure loss mechanism of sample air pipeline is stated, the pressure of the sample air pipeline is controlled to damage
Miss a chance structure leading portion pressure and the sample pressure adjustment pipeline pressure pressure differential.
Alternatively, following compositions can be enumerated：The pressure control mechanism includes：Gas lines,
In the back segment of the pressure loss mechanism of the sample air pipeline, to gas as defined in sample air pipeline supply；
Pressure-control valve is arranged on the gas lines；And differential manometer, detect the front and rear pressure of the pressure loss mechanism
Force difference controls the pressure-control valve according to the pressure differential detected by the differential manometer.
As more specific embodiment, following gas analyzing apparatus can be enumerated：The sample pressure control portion ginseng
According to the pressure of the leading portion of the pressure loss mechanism, by the sample air pipeline of the leading portion of the pressure loss mechanism
The pressure differential of pressure and the pressure of sample pressure adjustment pipeline remains certain mode, and the sample pressure is controlled to adjust
The pressure of pipeline.
More specifically, the pressure loss mechanism can be any one in capillary, throttle orifice and counterbalance valve.
The gas analyzing apparatus further includes：First gas service, to the pressure of the sample air pipeline
Lose the back segment supply first gas of mechanism；And first gas pressure regulating device, with reference to the pressure of the sample air pipeline
The pressure of the back segment of power loss mechanism, by the supply lateral pressure of the first gas service and the sample air pipeline
The difference of pressure is maintained certain.If such gas analyzing apparatus, even if then being sent out in the pressure of the sample air pipeline
In the case of having given birth to variation, also the flow of the first gas of supply can be maintained certain, therefore sample air and the can be made
The mixing ratio of one gas becomes certain.
As specific embodiment, the gas analyzing apparatus further includes oxidation catalyst, and the oxidation catalyst exists
The back segment of the discharge line removes the hydrocarbon components other than methane from sample air.
The gas analyzing apparatus further includes：Second gas service, to the pressure of the sample air pipeline
Lose the back segment supply second gas of mechanism；And second gas pressure regulating device, with reference to the pressure of the sample air pipeline
The pressure of the back segment of power loss mechanism, by the supply lateral pressure of the second gas service and the sample air pipeline
The difference of pressure is maintained certain.If such gas analyzing apparatus, even if then due to the pressure in the sample air pipeline
In the case that variation has occurred in power, also the flow of the second gas of supply can be maintained certain, so sample air can be made
Become certain with the mixing ratio of second gas.
The first gas is the gas comprising oxygen, and the second gas is the gas comprising hydrogen, and the gas divides
Analysis apparatus further includes moisture supply catalyst, and the moisture supply catalyst makes described first in the leading portion of the oxidation catalyst
Gas and the second gas react and generate water, if such gas analyzing apparatus, then due to can be urged to the oxidation
Agent supplies moisture, so the overfire of the methane content in the sample air can be prevented.
If the supply amount of the first gas is more than the amount reacted with the second gas, institute is used by that can supply
Stating oxidation catalyst makes oxygen necessary to non-methane flammability, therefore can inhibit the deterioration of the oxidation catalyst.
As noted previously, as the supply amount of the first gas is more than the amount reacted with the second gas, so in institute
State in gas analyzing apparatus, with the remaining first gas of the result reacted of the second gas, to dilute the examination
Sample gas.
If the gas analyzing apparatus further includes suction type sampling pump, the suction type sampling pump configuration is in the sample
The downstream of measurement device on gas pipeline, then due to easily generating the sample air pipe because the suction type sampling pump causes
The pressure oscillation in road, so the effect of the present invention is particularly significant.
As the specific embodiment of the gas analyzing apparatus, the sample air is the exhaust discharged from vehicle,
The gas analyzing apparatus is the gas analyzing apparatus of vehicle-mounted type.
The present invention also provides a kind of gas sampling device, including：Sample air pipeline, flows through sample air；Pressure is damaged
It misses a chance structure, is arranged on the sample air pipeline；And pressure control mechanism, pass through the back segment from the pressure loss mechanism
Discharge a part for the sample air or to gas as defined in the back segment supply of the pressure loss mechanism, it is described to control
The pressure differential of the front and rear sample air pipeline of pressure loss mechanism.It so can equally realize the effect of the present invention.
It is the analysis method for gases using gas analyzing apparatus in addition, the present invention also provides a kind of analysis method for gases,
The gas analyzing apparatus includes：Sample air pipeline, flows through sample air；Pressure loss mechanism is arranged on the sample gas
On body pipeline；And the sample air of the sample air pipeline is flowed through in analyzer, analysis, wherein, by being damaged from the pressure
The back segment of structure of missing a chance discharges a part for the sample air or to gas as defined in the back segment supply of the pressure loss mechanism
Body, to control the pressure differential of the front and rear sample air pipeline of the pressure loss mechanism.This method can also be realized
With the same effect of gas analyzing apparatus.
Gas analyzing apparatus or gas sampling device according to the invention, because even in the pressure of the sample air pipeline
In the case that variation has occurred in power, also the flow of the sample air of acquisition can be maintained certain, so can be accurately
Analyze the ingredient contained by sample air.
Even if in addition, in the case of due to being mixed with sample air by operating gas or diluent gas etc.,
It can make the mixing ratio of sample air and, operating gas or diluent gas etc. become certain, so examination can be analyzed accurately
Ingredient contained by sample gas.
Description of the drawings
Fig. 1 is the schematic diagram of the structure for the gas analyzing apparatus for representing first embodiment of the invention.
Fig. 2 is the schematic diagram of the structure for the gas analyzing apparatus for representing second embodiment of the invention.
Fig. 3 is the figure for illustrating the variation of the gas analyzing apparatus of second embodiment of the invention.
Fig. 4 is the schematic diagram for illustrating the gas analyzing apparatus of other embodiment of the present invention.
Fig. 5 is the schematic diagram of the structure for the gas analyzing apparatus for representing other embodiment of the present invention.
Fig. 6 is the schematic diagram of the structure for the gas analyzing apparatus for representing other embodiment of the present invention.
Reference sign
1 gas analyzing apparatus
11 sample air pipelines
12 methane analyzers
13 non-methane choking devices
14 first gas services
15 second gas services
17 moisture supply catalyst
20 pressure loss mechanisms
21 pressure control mechanisms
211 sample pressure adjust pipeline
212 sample air discharge lines
214 sample pressure control portions
22 first gas pressure regulating devices
23 second gas pressure regulating devices
Specific embodiment
Hereinafter, it is described with reference to the first embodiment of the gas analyzing apparatus 1 of the present invention.
The gas analyzing apparatus 1 of present embodiment, such as analyze from sample airs such as the exhausts of internal combustion engine discharge of vehicle
Contained ingredient.
Specifically, as shown in Figure 1, gas analyzing apparatus 1 includes：Sample air pipeline 11, flows through sample air；Methane
Analyzer (the first analyzer) 12, is arranged on sample air pipeline 11, analyzes the methane contained by sample air；Non-methane is ended
Device 13 is arranged on the upstream of the methane analyzer 12 on sample air pipeline；First gas service 14, for non-methane
Choking device 13 supplies the first gas for including oxygen；And second gas service 15, for being supplied to non-methane choking device 13
To the second gas comprising hydrogen.
The connections such as one end of sample air pipeline 11 and the exhaust pipe of vehicle, the other end is for example to external open (to air
It is open).On sample air pipeline 11 than methane analyzer 12 farther downstream, equipped with for being introduced to sample air pipeline 11
The sampling pump (not shown) of the suction type of sample air.
Methane analyzer 12 is measured as the hydrocarbon of organic compound (HC) as measure object ingredient,
In this embodiment, methane analyzer 12 has flame ionization ditector, for measuring the methane contained by sample air.
Non-methane choking device 13 makes to flow through the hydrocarbon other than the methane in the sample air of sample air pipeline 11
(non-methane ingredient) burns (oxidation) and is removed, and is the metallic catalyst such as comprising manganese dioxide and copper oxide.
First gas service 14 flows through first gas (gas for including oxygen), and the first gas includes non-methane
Choking device 13 removes oxygen necessary to non-methane ingredient, one end of first gas service 14 for example with gas storage (not shown)
Connections, the other ends such as bottle are connect with the leading portion of the non-methane choking device 13 of sample air pipeline 11 that is, upstream.
Second gas service 15 flows through second gas (gas for including hydrogen), the second gas include for
Oxygen generates the necessary hydrogen of water institute together, one end connection such as with gas bomb (not shown) of second gas service 15,
The other end is connect with the leading portion of the non-methane choking device 13 of sample air pipeline 11 that is, upstream.
In the present embodiment, the downstream of first gas service 14 and second gas service 15, becomes first
The mixing duct 16 that gas and second gas are mixed and flowed through, downstream and the sample air pipeline 11 of the mixing duct 16
The upstream connection of non-methane choking device 13.
Moisture is equipped on the mixing duct 16 and supplies catalyst 17, the moisture supply catalyst 17 makes first gas
In oxygen and second gas in hydrogen highly effective reaction and generate water.
The gas analyzing apparatus 1 of present embodiment further includes full hydrocarbon analysis pipeline 18, the full nytron
Object analysis conduit 18 is in the upstream of sample air pipeline 11 and the point of mixing duct 16 from sample air pipeline 11 branch.
Full hydrocarbon analysis pipeline 18 is for analyzing the full hydrocarbon contained by sample air, equipped with complete hydrocarbonization
Close the of the sample air flow of object analyzer (the second analyzer) 181 and the control full hydrocarbon analysis pipeline 18
One volume control device 182.
Full hydrocarbon analysis device 181 will be as the hydrocarbon of organic compound (HC) as measure object ingredient
It is measured, in this embodiment, there is flame ionization ditector, for measuring complete hydrocarbonization contained by sample air
Close object.
First flow control device 182 is using with fluid resistances such as the capillaries of internal diameter thinner than the runner before and after it
Element can also utilize the compositions such as mass flow controller and throttle orifice.
Confirm in addition, the gas analyzing apparatus 1 of present embodiment includes non-methane choking device with pipeline 19, the non-methane
Choking device confirmation pipeline 19 makes sample air not be oriented to methane analyzer 12 by non-methane choking device 13.
The confirmation of non-methane choking device with pipeline 19 in a manner of detour non-methane choking device 13, in non-methane choking device 13
Converge from 11 branch of sample air pipeline in the downstream of non-methane choking device 13 and sample air pipeline 11 upstream.In addition, branch
Point is positioned at the upstream with the point of mixed gas pipeline 16 of sample air pipeline 11.
In the present embodiment, in shunting point and remittance of the non-methane choking device confirmation of sample air pipeline 11 with pipeline 19
It is provided with the first valve V1 between chalaza, and in the confirmation of non-methane choking device with being provided with the second valve V2 on pipeline 19.It is in addition, logical
Switching the first valve V1 and the second valve V2 is crossed, sample air is made to flow through sample air pipeline 11 or non-methane choking device confirmation pipeline
19 one party.
In addition, the gas analyzing apparatus 1 of present embodiment further includes：Sample air is flowed through in pressure loss mechanism 20, control
The flow of the sample air of pipeline 11；Pressure control mechanism 21, before and after the pressure loss mechanism 20 of sample air pipeline 11
Pressure differential control be certain；First gas pressure regulating device 22, by the back segment of the pressure loss mechanism 20 of sample air pipeline 11
The pressure differential control of pressure and first gas service 14 be certain；And second gas pressure regulating device 23, by sample gas
The pressure of the back segment of the pressure loss mechanism 20 of body pipeline 11 and the pressure differential control of second gas service 15 are certain.
Pressure loss mechanism 20 is located at the leading portion with the point of mixing duct 16 of sample air pipeline 11, in the implementation
In mode, for example, by using capillary (the first capillary 20).
Pressure control mechanism 21 loses the pressure of the back segment of mechanism 20 by control pressure, by the pressure of sample air pipeline 11
The front and rear pressure differential of power loss mechanism 20 remains centainly.Specifically, pressure control mechanism 21 includes：Sample pressure adjusts
Pipeline 211, such as opened wide to air, it is connected with outside；Sample air discharge line 212, connection sample pressure adjustment pipeline 211
With sample air pipeline 11, a part for sample air is oriented to sample pressure adjustment pipeline 211；As hydraulic resistance element
Second capillary 213 is arranged on sample pressure adjustment pipeline 211；And sample pressure control portion 214, it is arranged on sample pressure
On power adjustment pipeline 211, the pressure of adjustment sample pressure adjustment pipeline 211.
Sample pressure adjusts the connection such as one end and gas bomb (not shown) of pipeline 211, from supplies such as the gas bombs
Gas flow through the sample pressure adjustment pipeline 211 inside.
One end of sample air discharge line 212 is connect with the back segment of the pressure loss mechanism 20 of sample air pipeline 11,
The other end is connect with sample pressure adjustment pipeline 211.The upstream branch of the sample air discharge line 212 of present embodiment is 2
Item, a side connect with sample air pipeline 11, and the opposing party connect with non-methane choking device confirmation pipeline 19.
In the present embodiment, sample air pipeline 11 and the tie point of sample air discharge line 212 back segment and
In the leading portion of non-methane choking device 13, the 5th capillary 24 is provided with, non-methane cut-off is flowed through in the 5th capillary 24 control
The flow of the gas of device 13.
In addition, the leading portion of the second valve V2 in non-methane choking device confirmation pipeline 19, is provided with the 6th capillary 25, institute
State the flow that the gas of non-methane choking device confirmation pipeline 19 is flowed through in the control of the 6th capillary 25.
In addition, by being by the flow set of the 5th capillary 24 or the sample air of the 6th capillary 25, less than passing through
The flow of the sample air of first capillary 20 and the first gas and second that sample air pipeline 11 is flowed into from mixing duct 16
Total flow of the flow of gas.
Thus, it is possible to sample air is prevented from sample air discharge line 212 to 11 adverse current of sample air pipeline.
In addition, for whether setting the 5th capillary 24 and the 6th capillary 25, can also suitably change.
Second capillary 213 be located at sample pressure adjustment pipeline 211 with the tie point of sample air discharge line 212
On back segment.
Sample pressure control portion 214 is controlled from sample air pipeline 11 or non-methane choking device confirmation pipeline 19 to sample
The flow for the sample air that gas outlet pipe road 212 flows into.Specifically, the sample pressure control portion 214 is sample pressure
Regulating valve 214V, the sample pressure-regulating valve 214V be arranged on sample pressure adjustment pipeline 211 with sample air discharge pipe
The upstream of the tie point in road 212.In addition, the pressure of the leading portion of the pressure loss mechanism 20 of reference sample gas pipeline 11, control
The valve opening of the sample pressure-regulating valve 214V.
It more specifically illustrates, sample pressure-regulating valve 214V is damaged by directly perceiving the pressure of sample air pipeline 11
Miss a chance structure 20 leading portion pressure, to change valve opening.According to this composition, sample pressure-regulating valve 214V flows through examination by adjusting
The flow of the gas of sample pressure adjustment pipeline 211 carrys out the pressure of Control Assay pressure adjustment pipeline 211.
First gas pressure regulating device 22 includes：Third capillary 221, as being arranged on first gas service 14
Hydraulic resistance element；And first gas pressure regulator valve 222, it is arranged on the upstream of the third capillary 221.
Third capillary 221 controls the flow for the first gas for flowing through first gas service 14, supplies first gas
To generating crushing in pipeline 14.
First gas pressure regulator valve 222 controls the pressure differential of the first gas service 14 before and after third capillary 221
It is certain, such as the pressure of the back segment of catalyst 17 is supplied to control valve opening according to the moisture of mixing duct 16.Here
One gas pressure regulating valve 222 and the sample pressure-regulating valve 214V are similary, are supplied by the moisture for directly perceiving mixing duct 16
Change valve opening to the pressure of the back segment of catalyst 17.According to this composition, first gas pressure regulator valve 222 is by adjusting flowing through
The flow of the first gas of one gas lines 14, the pressure of control first gas service 14.
Second gas pressure regulating device 23 includes：4th capillary 231, as being arranged on second gas service 15
Hydraulic resistance element；And second gas pressure regulator valve 232, it is arranged on the upstream of the 4th capillary 231.
The flow of the second gas of second gas service 15 is flowed through in the control of 4th capillary 231, supplies second gas
To generating crushing in pipeline 15.
Second gas pressure regulator valve 232 controls the pressure differential of the second gas service 15 before and after the 4th capillary 231
It is certain, such as the pressure of the back segment of catalyst 17 is supplied to control valve opening according to the moisture of mixing duct 16.Here
Two gas pressure regulating valves 232 and the sample pressure-regulating valve 214V are similary, are supplied by the moisture for directly perceiving mixing duct 16
Change valve opening to the pressure of the back segment of catalyst 17.According to this composition, second gas pressure regulator valve 232 is by adjusting flowing through
The flow of the second gas of two gas lines 15 controls the pressure of second gas service 15.
Then, illustrate the action of the gas analyzing apparatus 1 of present embodiment.
First, if acting sampling pump (not shown), from the row as sample air of the internal combustion engine discharge of vehicle
Gas is introduced into sample air pipeline 11 and full hydrocarbon analysis pipeline 18.At this time as needed, sample air can also be made
Pass through capillary (not shown) of filter F and control flow etc..
Flow control is carried out to collected sample air by the first capillary 20 and first flow control device 182,
Remaining sample air more than defined flow do not enter sample air pipeline 11 and full hydrocarbon analysis pipeline 18 and
It is discharged to outside.
At this point, sample pressure-regulating valve 214V is directly monitored by the leading portion of the pressure loss mechanism 20 of sample air pipeline 11
Pressure.
For example, in the case where the pressure of the leading portion of the pressure loss mechanism 20 of sample air pipeline 11 rises, make examination
The valve opening of sample pressure-regulating valve 214V becomes larger.The flow of sample pressure adjustment pipeline 211 increases as a result, and sample pressure is adjusted
Pressure between valve 214V and the second capillary 213 rises.
As a result, due to the pressure and sample of the sample air discharge line 212 that are connect with sample pressure adjustment pipeline 211
Pressure differential between gas pipeline 11 becomes smaller, and sample is flowed to from sample air pipeline 11 or non-methane choking device confirmation pipeline 19
The amount of the gas in gas outlet pipe road 212 is reduced, so in the pressure of 20 back segment of pressure loss mechanism of sample air pipeline 11
It rises.
On the other hand, in the case where the pressure of 20 leading portion of pressure loss mechanism of sample air pipeline 11 has dropped, make
The valve opening of sample pressure-regulating valve 214V becomes smaller.The flow of sample pressure adjustment pipeline 211 reduces as a result, sample pressure tune
The pressure saved between valve 214V and the second capillary 213 declines.
As a result, due to the pressure and sample of the sample air discharge line 212 that are connect with sample pressure adjustment pipeline 211
Pressure differential between gas pipeline 11 becomes larger, and sample is flowed to from sample air pipeline 11 or non-methane choking device confirmation pipeline 19
The amount of the gas in gas outlet pipe road 212 increases, so under the pressure of 20 back segment of pressure loss mechanism of sample air pipeline 11
Drop.
By using such mode, sample pressure-regulating valve 214V makes the pressure loss mechanism 20 of sample air pipeline 11
The pressure of leading portion and back segment is always maintained certain, and the flow by the sample air of the first capillary 20 is made to keep certain.
Passed through the sample air of the first capillary 20, with supplied by mixing duct 16 to sample air pipeline 11
One gas and second gas are converged.
At this point, first gas pressure regulator valve 222 and second gas pressure regulator valve 232, the moisture for being directly monitored by mixing duct 16 supplies
To the pressure of the back segment of catalyst 17, the pressure of the back segment of the moisture supply catalyst 17 of the mixing duct 16 is sample air pipe
The pressure of the back segment of the pressure loss mechanism 20 in road 11.
For example, in the case where the pressure of the back segment of the moisture supply catalyst 17 of mixing duct 16 rises, the first gas
The valve opening of body pressure regulator valve 222 and second gas pressure regulator valve 232 becomes larger respectively, and the flow for flowing through the gas of these pressure regulator valves increases
Add.
As a result, the pressure between the first gas pressure regulator valve 222 of first gas service 14 and third capillary 221
Pressure between power and 232 and the 4th capillary 231 of second gas pressure regulator valve of second gas service 15 respectively on
It rises.
On the other hand, in the case where the pressure of the back segment of the moisture of mixing duct 16 supply catalyst 17 has dropped, the
The valve opening of one gas pressure regulating valve 222 and second gas pressure regulator valve 232 is respectively smaller, and flows through first gas pressure regulator valve 222 and
The flow of the gas of two gas pressure regulating valves, 232 these pressure regulator valves is reduced.
As a result, the pressure between the first gas pressure regulator valve 222 of first gas service 14 and third capillary 221
Pressure between power and 232 and the 4th capillary 231 of second gas pressure regulator valve of second gas service 15 respectively under
Drop.
By using such mode, first gas pressure regulator valve 222 is by the pressure loss mechanism 20 of sample air pipeline 11
The pressure of back segment and the pressure of the leading portion of the third capillary 221 of first gas service 14 are maintained certain, make to sample
The flow for the first gas that gas pipeline 11 supplies remains centainly.
In addition, second gas pressure regulator valve 232 is by the pressure of 20 back segment of pressure loss mechanism of sample air pipeline 11 and the
The pressure of the leading portion of 4th capillary 231 of two gas lines 15 is maintained certain, makes to supply to sample air pipeline 11
The flow of second gas keep certain.
At this time, it is preferred that moisture is included in first gas and supplies the amount that catalyst 17 reacts and become water with hydrogen
Above oxygen.Namely it is preferred that the gas supplied from mixing duct 16 to sample air pipeline 11 includes water and oxygen.
Sample air and the gas comprising water and oxygen supplied by mixed gas pipeline to sample air pipeline 11 as a result,
Body converges and is diluted, and by non-methane choking device 13, is suitably carried out flow control as needed, is oriented to methane analyzer
12 are analyzed.
Gas analyzing apparatus 1 according to this configuration, though for example because of the pulsation of sampling pump, pass through accelerator or braking
Device makes the operational situation of engine change and the pressure for being sent into the sample air of sample air pipeline 11 is caused to be become
In the case of dynamic, the pressure differential before and after pressure loss mechanism 20 can also be maintained certain, and pressure loss mechanism will be passed through
The amount of 20 sample air remains centainly.
Such as even if the state in the engine for being made vehicle due to acceleration or brake operating etc. is changed and makes sample air pipe
In the case of the pressure quick shift of the entrance side in road 11, due to the pressure loss mechanism 20 also referring to sample air pipeline 11
Leading portion pressure, the pressure of 20 back segment of pressure loss mechanism of adjustment sample air pipeline 11, so can will be damaged by pressure
The flow of sample air of structure 20 of missing a chance remains centainly.
In addition, even if in the case of the pressure oscillation of sample air pipeline 11, due to the pressure of sample air pipeline 11
The pressure of power loss mechanism 20 back segment and the pressure differential of the leading portion of, 221 and the 4th capillary 231 of third capillary are also kept respectively
To be certain, so the flow of the first gas that supplied to sample air pipeline 11 and second gas can be remained centainly.
As a result, it is possible to make that 20 back segment of pressure loss mechanism in sample air pipeline 11 converges, sample airs
Become certain with the mixing ratio of first gas and second gas.
The dilution rate of sample air that first gas and second gas are formed as a result, is stablized, and can accurately measure examination
The concentration and amount of methane contained by sample gas.
Due to the downstream with the point of mixing duct 16 of sample air discharge line 212 and, sample air pipeline 11
Connection so from the gas that sample air discharge line 212 is discharged, becomes sample air and is mixed with first gas and second gas
The mixing ratio of gas afterwards, sample air and first gas and second gas is not easy to change.
But it in order to accurately analyze the methane content contained by sample air with gas analyzing apparatus 1, needs by non-
Hydrocarbon combustion other than methane in the sample air is only carried out separation of methane by methane choking device 13.
When making the hydrocarbon combustion other than methane by non-methane choking device 13, there are first if oxygen deficiency
The incombustible problem of hydrocarbon other than alkane.But if excessively supplying oxygen, there are asking for methane overfire
Topic.
Accordingly, it is considered to water is supplied to non-methane choking device 13, to inhibit the burning of methane.
About this point, in the present embodiment, due to moisture supply catalyst 17 supply as first gas
The amount of gas comprising oxygen is more than the amount of the gas comprising hydrogen as second gas, so being supplied to sample air pipeline 11
To the gas comprising oxygen as first gas and the gas comprising water, the gas comprising water, which contains, passes through moisture
Supply the water that catalyst 17 generates.
Therefore, even if the pressure oscillation of sample air, appropriate amount can also be stably supplied to non-methane choking device 13
Oxygen and water, so the separating property of non-methane choking device 13 can be adjusted in appropriate range.
Then, it is described with reference to the second embodiment of the gas analyzing apparatus 1 of the present invention.
In the first embodiment, pressure control mechanism 21 from the back segment of pressure loss mechanism 20 by one of sample air
Divide discharge, but in this second embodiment, as shown in Fig. 2, pressure control mechanism 21 is supplied to the back segment of pressure loss mechanism 20
To defined gas.Hereinafter, illustrate the structure of the pressure control mechanism 21 of second embodiment.
Pressure control mechanism 21 loses the pressure of the back segment of mechanism 20 by control pressure, before pressure loss mechanism 20
Pressure differential afterwards remains centainly.Specifically, as shown in Fig. 2, pressure control mechanism 21 includes：Third gas service L,
Externally to third gas as defined in the back segment supply of pressure loss mechanism 20；Pressure-control valve LV is arranged on third gas confession
To on pipeline L；And control device C, the valve opening of control pressure control valve LV.
Third gas service L for example will be used as third gas to pressure loss machine by the air that filter F is taken into
The downstream supply of structure 20.In addition, as third gas, as long as methane analyzer 12 and full hydrocarbon analysis device are not interfered
The gas of the analysis of 181 pairs of sample airs, such as can be sample air itself or the first embodiment
First gas, second gas or other gases etc..
The third gas service L is connect with the discharge duct RL equipped with sampling pump (not shown).In addition, being vented
Pipeline RL is equipped with buffer container BT.
Pressure-control valve LV is located on third gas service L, the flow of third gas is controlled, specifically, pressure
Control valve LV is the solenoid valves such as linear valve.
Control device C is the computer for having CPU, memory, A/D converter etc., CPU and peripheral equipment according to being stored in
Program co-operating in the predetermined region of the memory, the valve opening of control pressure control valve LV.
Here, the differential manometer DPS of the front and rear pressure differential equipped with detection pressure loss mechanism 20, will pass through the differential manometer
The pressure differential that DPS is detected is sent as pressure difference signal to control device C successively.Specifically, the differential manometer DPS detections
The pressure of the upstream of pressure loss mechanism 20 and the upstream of each analyzer 12,181 in the downstream as pressure loss mechanism 20
The pressure differential of pressure.
In addition, the pressure differential that control device C is shown according to pressure difference signal, controls as the linear of the pressure-control valve LV
Valve.Specifically, control device C is in a manner of making the pressure differential that pressure difference signal is shown consistent with preset desired value, it is right
The valve opening of pressure-control valve LV carries out feedback control.
According to the gas analyzing apparatus 1 formed in this way, even if leading to engine because of the pulsation of sampling pump, acceleration or braking
Operational situation change and make in the case that variation has occurred in the pressure of the sample air of feeding sample air pipeline 11, pressure
Power control mechanism 21 can also be by the front and rear pressure differential of pressure loss mechanism 20 (that is, the upstream of pressure loss mechanism 20 and, examination
The pressure differential of the point of sample gas pipeline 11 and third gas service L) it is maintained certain.Thereby, it is possible to make to pass through pressure
The flow of the sample air of power loss mechanism 20 remains centainly, can make to flow through methane analyzer 12 and full hydrocarbon point
The flow of the sample air of parser 181 becomes certain.
Further, since pressure control mechanism 21 is so that the front and rear pressure differential of pressure loss mechanism 20 becomes certain side
Formula supplies the air as third gas, so sample air can be maintained to institute's phase to the back segment of pressure loss mechanism 20
The dilution rate of prestige realizes the raising of the measurement accuracy of methane analyzer 12 and full hydrocarbon analysis device 181.
In addition, according to the embodiment, numerical control has been carried out to pressure-control valve LV by control device C, but
It is that can also simulation control be carried out to pressure control portion LV according to the detected value of differential pressure pickup DPS.
Specifically, as shown in figure 3, following manner can be enumerated：By that will represent the detected value of differential pressure pickup DPS
Voltage and the control source analog calculator for representing preset desired value, and by the output voltage of the difference based on these voltages
It is exported to pressure-control valve LV, carrys out the valve opening of control pressure control valve LV.
It is real second as another difference but in the first embodiment and the second embodiment
It applies and differential manometer DPS is equipped in mode, the pressure differential control linear valve LV detected according to the differential manometer DPS.Hereinafter, explanation should
Point.
First, as shown in figure 4, by the analyzers A such as methane analyzer and full hydrocarbon analysis device to by taking
Sample pump P is collected to be vented in the structure analyzed, and pressure regulator valve V for example can be the mechanical pressure regulator valve of diaphragm type.
In this configuration, it is certain flow in order to which the control of the extraction flow of analyzer A will be flowed through, as long as so that capillary etc.
The front and rear pressure differential of pressure loss mechanism Z remains certain mode and controls pressure regulator valve V.
But if pressure regulator valve V be mechanical pressure regulator valve, can generate because sampling pump P flow change (pulsation) or
Response delay, hardening of diaphragm etc. caused by the variation of ambient temperature caused by variation of air pressure etc..As a result, using machine
In the structure of tool formula pressure regulator valve, it is various it is physical due to and ambient enviroment variation etc., it is impossible to will be pressed with desired precision
The front and rear pressure differential of power loss mechanism Z remains centainly.As a result, being impacted to the indicated value of analyzer A, generation cannot
The problem of ensureing analysis precision.
Therefore, the present inventor is described in order to solve the problems, such as, devises structure shown in fig. 5.That is, the structure is to pressure
It loses and linear valve LV is set on the gas lines L of gas (being here air) as defined in the back segment supply of mechanism 20, and
Has the differential manometer DPS of the front and rear pressure differential of detection pressure loss mechanism Z, so that the detected value of differential manometer DPS becomes certain
Mode control the valve opening of linear valve LV.
According to this configuration, due to controlling linear valve LV according to the detected value of differential manometer DPS, so can be by ambient temperature
Influence with air pressure isoperimetric collarette border drop to it is very low, can be with desired precision by the front and rear pressure differential of pressure loss mechanism Z
It remains certain.
In addition, because controlling linear valve LV to the detected value of pressure differential according to differential manometer DPS, so compared to shown in Fig. 4
Structure can accelerate response, even if the flow for generating pump P changes (pulsation), the flow changes the indicated value to analyzer A
Influence it is also minimum, it is ensured that the analysis precision of analyzer A.
Can this function and effect be obtained by the gas analyzing apparatus 1 of second embodiment.
That is, in this second embodiment, since pressure control mechanism 21 is according to the detected value control pressure of differential manometer DPS damage
Miss a chance the front and rear pressure differential of structure 20, thus the influence in ambient temperature and air pressure isoperimetric collarette border can be reduced to it is minimum, i.e.,
The flow of generation sampling pump is made to change (pulsation), the influence of the indicated value of each analyzer 12,181 will can be also reduced to minimum.
As long as the in addition, influence that the flow that can fully reduce sampling pump changes, it is possible to buffer container BT is not needed to, it can be real
The miniaturization of existing device.
In addition, the present invention is not limited to each embodiments.
For example, as to sample air be sampled it is sampler, including the examination described in each embodiment
Sample gas pipeline 11, pressure loss mechanism 20, the gas sampling device of pressure control mechanism 21 and a side of the invention
Formula.
Pressure control mechanism 21 can also be by defined gas after the pressure loss mechanism 20 of sample air pipeline 11
Section supply.
As long as defined gas does not interfere the gas of analysis of the methane analyzer 12 to sample air, for example, can
To be sample air itself or first gas, second gas or other described gases etc..
Sample pressure-regulating valve 214V is not limited to directly perceive 20 leading portion of pressure loss mechanism of sample air pipeline 11
The valve of pressure, can also be in the following way：It will be by 20 leading portion of pressure loss mechanism on sample air pipeline 11 be configured
The pressure that pressure sensor etc. measures is exported to information processing unit (not shown), and described information processing unit is to the sample
Pressure-regulating valve 214V sends out command signal, to adjust the valve opening.Described information processing unit has CPU, memory, leads to
Can be 1 dedicated device of gas analyzing apparatus or general computer etc. casually with A/D converter etc..
Equally, first gas pressure regulator valve 222 and second gas pressure regulator valve 232 are not limited to directly perceive the pressure of mixing duct 16
Power, can also be in the following way：It will be from pressure that pressure sensor on mixing duct 16 etc. measures be configured to information
Processing unit exports, and described information processing unit sends out finger respectively to first gas pressure regulator valve 222 and second gas pressure regulator valve 232
Signal is enabled, to adjust their valve opening.
Moisture supply catalyst 17 is used to improve the reaction efficiency of oxygen and hydrogen in mixing duct 16, due to mixing
The oxygen and hydrogen mixed in pipeline 16, even if no moisture is supplied in the case of catalyst 17, natural reaction generates
Water, so moisture supply catalyst 17 is not composition essential to gas analyzing apparatus 1.Therefore, gas analyzing apparatus 1 without
It is certain to have moisture supply catalyst 17.
First gas service 14 and second gas service 15 can not also converge, and separately with sample
Gas pipeline 11 connects.
Such as shown in Fig. 6, gas analyzing apparatus 1 can directly feed water or the gas for including water containing water from outside
As second gas.
In addition, the gas comprising water directly fed from outside can also be first gas, the first gas includes rule
Quantitative oxygen.
Gas comprising oxygen can be for example big of only oxygenous gas or the oxygen containing normal concentration
The mixed gas such as gas.
Equally, the gas comprising hydrogen can be the only gas of hydrogen or the hydrogen containing normal concentration
Mixed gas.
First gas and second gas are not limited to containing oxygen, hydrogen or water, according to the purpose of analysis or comprising
The gas of nitrogen or the gas comprising helium or various gases in addition.
Sampling pump is not limited to that the back segment in methane analyzer 12 is configured, and can also be configured before pressure loss mechanism 20
Section.
The gas analyzing apparatus 1 of the present invention is not limited to be loaded in the dress analyzed on vehicle etc. the exhaust of vehicle etc.
It puts, the exhaust that vehicle etc. is analyzed in laboratory etc. can also be arranged on, be not limited to the exhaust of vehicle etc. in addition, can be used for point
Analyse the ingredient of the large-scale sample air such as environmental gas.
In addition, the ingredient as analysis object is also not necessarily limited to methane, other compositions, such as analysis can also be analyzed comprising complete
The ingredients such as hydrocarbon, nitrogen, oxygen, hydrogen, carbon or sulphur.
As analyzer, the flame ionization ditector is not limited to, can also be used using analysis sample air
The non-dispersion infrared absorption process of ingredient, chemoluminescence method, magnetism platen press, zirconium dioxide method, FTIR, mid-infrared laser optical spectroscopy,
The various analyzers of gas chromatography or liquid chromatography etc. or combination are using these analyzers.
As long as pressure loss mechanism 20 makes to generate the pressure loss in sample air pipeline 11, in aforementioned embodiment
In used capillary, but can also be throttle orifice and counterbalance valve etc..
About each of the capillary of the second capillary~the 6th and first flow control device 182, capillary is not limited to,
Can also be throttle orifice and counterbalance valve etc..
Additionally, this invention is not limited to the embodiment, do not depart from can be carried out in the scope of the inventive concept it is various
Deformation.
Technical characteristic recorded in each embodiment (embodiment) of the present invention can be combined with each other and form new skill
Art scheme.
Claims (16)
1. a kind of gas analyzing apparatus, which is characterized in that
The gas analyzing apparatus includes：
Sample air pipeline, flows through sample air；
Pressure loss mechanism is arranged on the sample air pipeline；
Pressure control mechanism, by discharging a part for the sample air from the back segment of the pressure loss mechanism or to institute
Gas as defined in the back segment supply of pressure loss mechanism is stated, to control the front and rear sample air of the pressure loss mechanism
The pressure differential of pipeline；And
The sample air of the sample air pipeline is flowed through in analyzer, analysis.
2. gas analyzing apparatus according to claim 1, which is characterized in that
The pressure control mechanism includes：
Sample air discharge line, by a part for the sample air from the pressure loss machine of the sample air pipeline
The back segment discharge of structure；
Sample pressure adjusts pipeline, is connect with the sample air discharge line；And
Sample pressure control portion with reference to the pressure of the leading portion of the pressure loss mechanism of the sample air pipeline, controls institute
State the pressure of the pressure and the pressure of sample pressure adjustment pipeline of the leading portion of the pressure loss mechanism of sample air pipeline
Force difference.
3. gas analyzing apparatus according to claim 1, which is characterized in that
The pressure control mechanism includes：
Gas lines, to the back segment of the pressure loss mechanism of the sample air pipeline, gas as defined in supply；
Pressure-control valve is arranged on the gas lines；And
Differential manometer detects the front and rear pressure differential of the pressure loss mechanism,
The pressure-control valve is controlled according to the pressure differential detected by the differential manometer.
4. gas analyzing apparatus according to claim 1, which is characterized in that the pressure loss mechanism is capillary, section
Any one in discharge orifice and counterbalance valve.
5. gas analyzing apparatus according to claim 1, which is characterized in that
The gas analyzing apparatus further includes：
First gas service supplies first gas to the back segment of the pressure loss mechanism of the sample air pipeline；
And
First gas pressure regulating device, with reference to the pressure of the back segment of the pressure loss mechanism of the sample air pipeline, by institute
The supply lateral pressure and the difference of the pressure of the sample air pipeline for stating first gas service are maintained certain.
6. gas analyzing apparatus according to claim 1, which is characterized in that the pressure on the sample air pipeline
Power is lost between mechanism and the analyzer, further includes non-methane choking device, and the non-methane choking device is by the carbon other than methane
Hydrogen compound ingredient is removed from the sample air.
7. gas analyzing apparatus according to claim 1, which is characterized in that
The gas analyzing apparatus further includes：
Second gas service supplies second gas to the back segment of the pressure loss mechanism of the sample air pipeline；
And
Second gas pressure regulating device, with reference to the pressure of the back segment of the pressure loss mechanism of the sample air pipeline, by institute
The supply lateral pressure and the difference of the pressure of the sample air pipeline for stating second gas service are maintained certain.
8. gas analyzing apparatus according to claim 7, which is characterized in that
The first gas is oxygen, and the second gas is hydrogen,
The gas analyzing apparatus further includes moisture supply catalyst, and the moisture supplies catalyst in the non-methane choking device
Leading portion the first gas is made to be reacted with the second gas and generate water.
9. gas analyzing apparatus according to claim 8, which is characterized in that the supply amount of the first gas is more than and institute
State the amount of second gas reaction.
10. gas analyzing apparatus according to claim 9, which is characterized in that with the knot reacted with the second gas
The remaining first gas of fruit, to dilute the sample air.
11. gas analyzing apparatus according to claim 10, which is characterized in that the sample air discharge line is from than institute
The back segment of moisture supply catalyst more posteriorly is stated, a part for the sample air after being diluted with the first gas is arranged
Go out.
12. gas analyzing apparatus according to claim 1, which is characterized in that the gas analyzing apparatus further includes suction
Type sampling pump, the downstream of the analyzer of the suction type sampling pump configuration on the sample air pipeline.
13. gas analyzing apparatus according to claim 1, which is characterized in that the sample air is discharged from internal combustion engine
Exhaust.
14. gas analyzing apparatus according to claim 1, which is characterized in that
The sample air is the exhaust discharged from vehicle,
The gas analyzing apparatus is the gas analyzing apparatus of vehicle-mounted type.
15. a kind of gas sampling device, which is characterized in that
The gas sampling device includes：
Sample air pipeline, flows through sample air；
Pressure loss mechanism is arranged on the sample air pipeline；And
Pressure control mechanism, by discharging a part for the sample air from the back segment of the pressure loss mechanism or to institute
Gas as defined in the back segment supply of pressure loss mechanism is stated, to control the front and rear sample air of the pressure loss mechanism
The pressure differential of pipeline.
16. a kind of analysis method for gases is the analysis method for gases using gas analyzing apparatus,
The gas analyzing apparatus includes：
Sample air pipeline, flows through sample air；
Pressure loss mechanism is arranged on the sample air pipeline；And
The sample air of the sample air pipeline is flowed through in analyzer, analysis,
The analysis method for gases is characterized in that,
By discharging a part for the sample air from the back segment of the pressure loss mechanism or to the pressure loss machine
Gas as defined in the back segment supply of structure, to control the pressure of the front and rear sample air pipeline of the pressure loss mechanism
Difference.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
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| JP2016242686 | 2016-12-14 | ||
| JP2016-242686 | 2016-12-14 | ||
| JP2017-070648 | 2017-03-31 | ||
| JP2017070648A JP6868442B2 (en) | 2016-12-14 | 2017-03-31 | Gas analyzer and gas sampling device |
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| CN108226268A true CN108226268A (en) | 2018-06-29 |
| CN108226268B CN108226268B (en) | 2021-11-09 |
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| CN201710655493.6A Active CN108226268B (en) | 2016-12-14 | 2017-08-03 | Gas analysis device, gas sampling device, and gas analysis method |
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| CN (1) | CN108226268B (en) |
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| CN109269846A (en) * | 2018-11-13 | 2019-01-25 | 中国汽车工程研究院股份有限公司 | Formaldehyde acquisition device and methanol vehicle emission analysis system |
| CN110954788A (en) * | 2019-10-28 | 2020-04-03 | 国网河北省电力有限公司电力科学研究院 | Gas component monitoring device, equipment running state monitoring method and terminal equipment |
| CN113701054A (en) * | 2020-05-20 | 2021-11-26 | 睿普工程股份有限公司 | Tail gas emission retrieves steady voltage control system |
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| EP3667315A1 (en) | 2018-12-12 | 2020-06-17 | HORIBA, Ltd. | Exhaust gas analysis apparatus, exhaust gas analysis method, and correction expression creation method |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP6868442B2 (en) | 2021-05-12 |
| CN108226268B (en) | 2021-11-09 |
| JP2018096962A (en) | 2018-06-21 |
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