CN107764885A - The apparatus and method for measuring gas concentration - Google Patents
The apparatus and method for measuring gas concentration Download PDFInfo
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- CN107764885A CN107764885A CN201711263048.1A CN201711263048A CN107764885A CN 107764885 A CN107764885 A CN 107764885A CN 201711263048 A CN201711263048 A CN 201711263048A CN 107764885 A CN107764885 A CN 107764885A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005259 measurement Methods 0.000 claims abstract description 49
- 239000007789 gas Substances 0.000 claims description 151
- 239000001301 oxygen Substances 0.000 claims description 103
- 229910052760 oxygen Inorganic materials 0.000 claims description 103
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 102
- 239000010416 ion conductor Substances 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 21
- 239000011159 matrix material Substances 0.000 claims description 13
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 10
- 238000005868 electrolysis reaction Methods 0.000 claims description 8
- 229910001260 Pt alloy Inorganic materials 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 229910052697 platinum Inorganic materials 0.000 claims description 6
- 229910000629 Rh alloy Inorganic materials 0.000 claims description 4
- 238000000354 decomposition reaction Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- PXXKQOPKNFECSZ-UHFFFAOYSA-N platinum rhodium Chemical group [Rh].[Pt] PXXKQOPKNFECSZ-UHFFFAOYSA-N 0.000 claims description 3
- -1 Oxonium ion Chemical class 0.000 description 16
- 238000009792 diffusion process Methods 0.000 description 14
- 238000012360 testing method Methods 0.000 description 14
- 230000004888 barrier function Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 238000006555 catalytic reaction Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 239000004020 conductor Substances 0.000 description 4
- 230000005518 electrochemistry Effects 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 230000001737 promoting effect Effects 0.000 description 4
- 239000007772 electrode material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004313 potentiometry Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 230000037427 ion transport Effects 0.000 description 1
- 238000000752 ionisation method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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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
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/4162—Systems investigating the composition of gases, by the influence exerted on ionic conductivity in a liquid
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
A kind of apparatus and method for measuring gas concentration, the device includes the current measuring device of at least two-stage current pump described at least two-stage current pump and connection, the at least two-stage current pump includes the primary pump and two stage pump being sequentially connected along the flow direction of tested gas, wherein described primary pump pumps out the tested gas of input to produce primary pump electric current by its electrode, the two stage pump pumps out remaining tested gas to produce two stage pump electric current by its electrode, the current measuring device measures the primary pump electric current and the two stage pump electric current, the voltage applied on the primary pump is adjusted according to the size of the two stage pump electric current, until the two stage pump electric current surveyed is not more than one close to zero preset value.The present invention realizes the reliability and precision that gas concentration measurement is effectively improved with simple structure.
Description
Technical field
The present invention relates to gas sensor domain, more particularly to a kind of apparatus and method for measuring gas concentration.
Background technology
Gas is one of common state of material, and the concentration of gas affects the environment where it.For example, controlled during steel-making
The concentration of oxygen controls steel quality, when automobile is by measuring exhaust emissions in oxygen concentration closed-loop control distributive value.Gas
The influence that the concentration level of body is brought in true environment is very big.Therefore, accurately the concentration of measurement gas turns into a key
Technology.
At present common gas concentration measurement scheme include electric-resistivity method, optical method, chromatography, ultrasonic method, trace element method,
Combustion method and electrochemical process etc..Electrochemical process is common method, can be divided into potentiometry and AC impedence method, current method etc. again.
Potentiometry is to form different potentials on electrode by gas with various concentration, and gas is characterized by measuring electrical potential difference
Bulk concentration, typical application are this special battery type potentiometer of energy.The shortcomings that method be potential measurement by electrode influences it is larger, survey
Amount is limited in scope and output result is non-linear.
AC impedance is to form the otherness of activation polarization and concentration polarization on electrode by various concentrations gas, is led
Send a telegraph the impedance difference of pole and be operated.The shortcomings that method is that the signal content that measurement obtains is complicated, and signal stabilization is poor.
Current method is to utilize ionic conductor material with electro catalytic electrode material by the absorption of gas, ionization, then passes through application
Voltage forms electric current in the loop by ion displacement, and electric current and gas concentration can form fixed corresponding under certain condition
Relation, you can for gas concentration measurement.
When current method generally requires the speed for making the ion velocity of displacement and gas diffusion come and reaches balance, now
Obtained gas current can correspond to authentic and valid gas concentration value.If being not reaching to dynamic equilibrium, now measurement is electric
Stream can not represent the corresponding concentration of gas.Therefore, whether current method needs to balance by Cutoff current process, to determine current value
Validity.
In existing product technology current balance type decision method generally using can this special battery principle, i.e. voltage method sentences
It is disconnected.This method is to determine internal atmosphere by the energy nernst voltage difference between measurement of comparison atmosphere and canonical reference atmosphere
CONCENTRATION STATE, and then determine carrying current it is whether accurate.There are some problems in voltage method, such as detection range is small, output electricity
Pressure with concentration be in logarithmic relationship, cause linearly it is poor, precision is low；The process has to (such as big using canonical reference gas simultaneously
Gas), this structure to measurement device proposes higher requirement (to increase even open to atmosphere passage), for example High aititude is due to sky
Oxygen content changes in gas, and final testing result is with regard to untrue.Therefore there is larger lack in the poised state of potentiometry Cutoff current
Fall into.
The content of the invention
It is a primary object of the present invention to overcome the deficiencies in the prior art, there is provided a kind of device for measuring gas concentration and side
Method, the reliability and precision of gas concentration measurement are improved with simple structure.
To achieve the above object, the present invention uses following technical scheme：
A kind of device for measuring gas concentration, including at least electricity of two-stage current pump at least described in two-stage current pump and connection
Flow measuring apparatus, at least two-stage current pump include primary pump and the two level being sequentially connected along the flow direction of tested gas
Pump, wherein the primary pump pumps out the tested gas of input to produce primary pump electric current by its electrode, the two stage pump passes through
Its electrode pumps out remnants tested gas and produces two stage pump electric current, the current measuring device measure the primary pump electric current and
The two stage pump electric current；The voltage applied on the primary pump wherein is adjusted according to the size of the two stage pump electric current, until
The two stage pump electric current surveyed is not more than one close to zero preset value.
Further：
The two stage pump electric current surveyed refers to that surveyed two stage pump electric current is zero no more than one close to zero preset value.
Also include the voltage-operated device for connecting the current measuring device, the voltage-operated device is according to the two level
The size of pump electric current adjusts the voltage applied on the primary pump, until the two stage pump electric current surveyed is not more than one close to zero
Preset value.
The device of the measurement gas concentration is the device of measurement oxygen concentration, and at least two-stage current pump formation is in oxygen
On ion conductor matrix, wherein the primary pump produces primary pump electric current by pumping out the oxygen of input, the two stage pump leads to
Cross the oxygen for pumping out remnants and produce two stage pump electric current；When the two stage pump electric current that the current measuring device is surveyed is not more than one
Close to zero preset value when, primary pump electric current that the current measuring device is surveyed is used for the concentration for characterizing oxygen.
The interior electrode of the primary pump and the two stage pump is platinum or platinum alloy material.
To measure the device of NOx gas concentrations, at least two-stage current pump is formed the device of the measurement gas concentration
On oxygen ion conductor matrix, at least two-stage current pump also includes being connected to the triplex after the two stage pump, described
The interior electrode of triplex contains the material for promoting NO electrolysis, wherein the primary pump pumps out the gas middle reaches of input by its electrode
Primary pump electric current is produced from oxygen, the two stage pump pumps out remaining free oxygen to produce two stage pump electric current, institute by its electrode
Stating triplex, by obtained NO is decomposed by NOx, all electrolysis be N2 and O2 by its electrode, and pump out be electrolysed caused by oxygen and
Produce triplex electric current；When the two stage pump electric current that the current measuring device is surveyed no more than one close to zero preset value when,
The triplex electric current that the current measuring device is surveyed is used for the concentration for characterizing NOx gases.
The interior electrode of the primary pump and the two stage pump is the material for the decomposition that can suppress NO.
The interior electrode of the primary pump and the two stage pump is platinum alloy material, and the interior electrode of the triplex is platinum rhodium
Alloy material.
Also include the heating unit being arranged on the oxygen ion conductor matrix.
A kind of method for measuring gas concentration, use the measurement device gas concentration of the measurement gas concentration.
Beneficial effects of the present invention have：
The gas concentration measuring apparatus of the present invention carries out gas concentration measurement using multistage electric current pump unit linkage work, its
Middle higher level's pump unit produces higher level's pump electric current by measuring gas concentration, and subordinate's pump unit produces subordinate by measurement remnant gas
Pump electric current, by measure subordinate's pump electric current whether no more than one close to zero preset value (such as measurement subordinate pump electric current whether
Be zero), come judge higher level's pump electric current whether reach capacity electric current (when the gas that the gas and the higher level's pump that enter higher level's pump pump out from
Son produces carrying current when reaching poised state), when subordinate's pump electric current is less than preset value, show the residual gas of subordinate's pump test
The very low of gas concentration is tested in body, i.e., ionization displaced largely tested gas to higher level's pump completely, now higher level's pump electricity
Flow for accurate carrying current, tested gas concentration can be characterized；When subordinate's pump electric current is not less than preset value, show residual gas
It is higher that the concentration of gas is tested in body, i.e., higher level's pump is without the tested gas of ionization transfer completely, and now higher level's pump electric current is not accurate
True carrying current, therefore tested gas concentration can not be represented, now, the application of higher level's pump is adjusted according to the current value of subordinate's pump
Magnitude of voltage, can change the electric current of higher level's pump makes to reach balance, carrying current is formed, so as to accurately measure tested gas concentration.
The application magnitude of voltage for adjusting higher level's pump can be operated by operating personnel.And in a kind of preferred embodiment,
Settable voltage-operated device, higher level's pump is automatically regulated by voltage-operated device according to the current measurement situation of subordinate's pump electric current
Application magnitude of voltage, further improve measurement gas concentration efficiency and accuracy.
In general, the current value for working as subordinate's pump of measurement shows to be tested the concentration of gas in residual gas closer to zero
It is lower, when the current value deviation zero point of subordinate's pump is on the high side, then show to be tested gas in the residual gas after higher level's pump ionizes
It is still more, it can determine whether that higher level's pump electric current is not up to carrying current.The voltage applied by adjusting higher level's pump, strengthens pump oxygen, until
The current value of subordinate's pump of measurement ensures that higher level's pump electric current is reached capacity electric current, and gas is tested so as to accurate characterization close to zero
The concentration of body.
The present invention is linked using multistage current pump to be tested gas concentration, by tested gas concentration, verification test result, root
It is combined together according to the process of current measurement feedback regulation pump voltage, it is not necessary to using canonical reference gas, simplify measurement apparatus
Structure, simultaneously effective improve the reliability and precision of measurement result.
Brief description of the drawings
Fig. 1 is a kind of structural representation of embodiment of device of present invention measurement gas concentration；
Fig. 2 is the structural representation of the device another kind embodiment of present invention measurement gas concentration.
Embodiment
Embodiments of the present invention are elaborated below.It is emphasized that what the description below was merely exemplary,
The scope being not intended to be limiting of the invention and its application.
Current pump is under current balance type state, and concentration and the electric current of gas form proportionate relationship, and this relation is by with lower section
Formula explanation：
I_0=CA/L (C_x "-C_x')
Wherein, C is constant, and A is the cross-sectional area of diffusion gas passage, and L is the length of diffusion gas passage, Cx " be into
The gas concentration entered, Cx ' are the gas concentration in test chamber, and when balanced balanced current produces, Cx ' is zero.
From equation, linear relationship is presented in output limit electric current and the gas concentration of test.The size of carrying current takes
Certainly in the size of measuring cell diffusion barrier and the gas concentration of air inlet.From the first diffusion law, gas diffusion process is present
The limit.Under ionization and the transhipment effect of electrochemical pump, when the gas of entrance and the gas ion that pumps out reach balance, now obtain
The electric current obtained is carrying current.In design structure, it is necessary to ensure that there is electrochemical pump enough ionization will enter with turn-over capacity
The gas entered all pumps out, and otherwise will be unable to form carrying current.According to above formula, when the timing of gas concentration one, limit electricity
What the output valve of stream was to determine.When tested gas concentration zero, no current output.Multistage current pump refers to that measuring cell has two
Individual or more than two carrying current pump units, the relation of upper and lower level is presented in gas passage.With the example of two current pumps
Illustrate this method：When gas is by diffusion admittance, higher level's pump unit is touched first.Higher level's pump unit will largely be tested gas electricity
From and transport out test chamber, finally give carrying current output.Residual gas is continued to diffuse into up to subordinate's pump unit, subordinate's pump
Corresponding carrying current output valve is obtained using the mode of ionization transhipment.
It can be determined that tested gas ionizes transhipment degree through higher level's pump using the size of subordinate's pump electric current.Due to reaching subordinate
The concentration that remnants on pump are tested gas is very low, therefore the carrying current output of subordinate's pump is very small.In general, work as
The current value quantity of subordinate's pump illustrates that measurement gas concentration is lower in residual gas, the ionization of higher level's pump is tested closer to zero
Gas is more, therefore the current precision that higher level's pump measures is higher.If it is on the high side that the current value of subordinate's pump deviates zero point, illustrate warp
Tested gas is still more in residual gas after the ionization of higher level's pump, then assert that the ionization process of higher level's pump is incomplete, pump electric current is surveyed
It is inaccurate to measure result.
Refering to Fig. 1, in one embodiment, measuring the device of gas concentration is included described at least two-stage current pump and connection
At least current measuring device of two-stage current pump, at least two-stage current pump are included along the flow direction of tested gas successively
The primary pump 6 and two stage pump 7 of connection, wherein the primary pump 6 by its inside and outside electrode 8,9 pump out the tested gas of input and
Primary pump electric current is produced, the two stage pump 7 pumps out remaining tested gas to produce two stage pump by its inside and outside electrode 10,11
Electric current, the current measuring device measures the primary pump electric current and the two stage pump electric current, according to the two stage pump electric current
Size adjusts the voltage applied on the primary pump 6, until the two stage pump electric current surveyed no more than one close to zero it is default
Value.
In a preferred embodiment, the two stage pump electric current surveyed refers to surveyed two level no more than one close to zero preset value
Pump electric current is zero.
In a preferred embodiment, the device of the measurement gas concentration also includes the voltage for connecting the current measuring device
Control device, the voltage-operated device (not shown) are adjusted according to the size of the two stage pump electric current on the primary pump 6
The voltage of application, until the two stage pump electric current surveyed is not more than one close to zero preset value.
In an advantageous embodiment, it is described measurement gas concentration device for measurement oxygen concentration device, it is described extremely
Few two-stage current pump is formed on oxygen ion conductor matrix 1, wherein the primary pump 6 pumps out input by its inside and outside electrode 8,9
Oxygen and produce primary pump electric current, the oxygen that the two stage pump 7 pumps out remnants by its inside and outside electrode 10,11 produces two
Level pump electric current；When the two stage pump electric current that the current measuring device is surveyed no more than one close to zero preset value when, the electricity
The primary pump electric current that flow measuring apparatus is surveyed is used for the concentration for characterizing oxygen.
In more preferred embodiment, the interior electrode 8,10 of the primary pump 6 and the two stage pump 7 is platinum or platinum alloy material
Material.
In another preferred embodiment, it is described measurement gas concentration device for measurement NOx gas concentrations device, institute
State at least two-stage current pump to be formed on oxygen ion conductor matrix 1, at least two-stage current pump also includes being connected to described two
Triplex 13 after level pump 7, the interior electrode 14 of the triplex 13 is containing the material for promoting NO electrolysis, wherein the primary pump
6 pump out in the gas of input free oxygen to produce primary pump electric current by its inside and outside electrode 8,9, and the two stage pump 7 passes through it
Inside and outside electrode 10,11 pump out remnants free oxygen and produce two stage pump electric current, the triplex 13 by its inside and outside electrode 14,
15 by obtained NO is decomposed by NOx, all electrolysis be N2 and O2, and pump out be electrolysed caused by oxygen and produce the electric current of triplex 13；
When the two stage pump electric current that the current measuring device is surveyed no more than one close to zero preset value when, the current measuring device
The electric current of triplex 13 surveyed is used for the concentration for characterizing NOx gases.
In more preferred embodiment, the interior electrode 8,10 of the primary pump 6 and the two stage pump 7 is point that can suppress NO
The material of solution.
In further preferred embodiments, the interior electrode 8,10 of the primary pump 6 and the two stage pump 7 is platinum alloy material
Material, the interior electrode 14 of the triplex 13 is platinum-rhodium alloy material.
In a preferred embodiment, the device of the measurement gas concentration also includes being arranged on the oxygen ion conductor matrix
Heating unit 12.
In another embodiment, a kind of method for measuring gas concentration, the measurement gas of foregoing any embodiment is used
The device of concentration measures gas concentration.
Example 1：
This example, as ion conductor, is used using testing oxygen concentration as explanation, current pump using oxygen ion conductor material
Oxonium ion electrocatalysis material is as pump electrode material.
The device for measuring gas concentration is electrochemistry ceramic chip, and its structure is as shown in Figure 1.The device mainly include oxygen from
Sub- conductor matrix 1, gas passage, oxonium ion electrochemical pump unit and heating unit 12.As illustrated, oxygen ion conductor matrix 1
Main material be oxygen ion conductor material, main function is the carrier of conduction oxonium ion after being ionized as oxygen.Gas
Passage includes diffusion barrier 2,3 and chamber 4,5.Gas passage function is that the smooth flow for ensureing gas reaches electrochemical reaction area
Domain, while the speed of the blocking structure limitation gas flowing as carrying current.Electrochemical pump unit includes flowing along air flue
Order arrangement primary pump 6 and two stage pump 7.Electrochemical pump is made up of oxygen ion conductor and the catalysis electrode on conductor.One-level
Pump 6 has inside and outside electrode 8,9；Two stage pump 7 has inside and outside electrode 10,11, and electrode uses has electric catalyticing characteristic to oxygen
Material, such as platinum or platinum alloy.The course of work of oxonium ion electrochemical pump is as follows：Interior electrode obtains electricity in the negative pole of external power
Son, and ionize oxygen molecule to form oxonium ion using the electrochemical catalysis characteristic of interior electrode, and by oxygen ion conductor by oxygen
Ion is transferred to external electrode side；Oxygen example is oxygen and electronics in external electrode punishment solution, and electronics returns to dispatch from foreign news agency by external circuit again
Source positive pole.How much the oxygen being ionized can be converted by the electric current by loop obtains, so as to calculate the concentration for obtaining oxygen.When
When electrochemistry pumps out the speed and the rate equation of oxygen entrance test cavity of oxonium ion, the electric current of electrochemical pump output is the limit
Electric current.The major function of heating unit 12 is to generate heat to providing hot environment to whole ceramic ionic conductor by heater strip.
The specific course of work introduced below：
Gas reaches chamber 4 by diffusion barrier 2, has started gas concentration measurement.Primary pump 6 is special in the catalysis of interior electrode 8
Property under by Oxygen Adsorption, and by ionization, transhipment；Finally start outside oxygen ion transport under the voltage that external circuit applies.
External electrode 9, to electrode, receives the oxonium ion that conveying comes, and oxonium ion reduction is turned into oxygen, electronics as interior electrode 8
Return at external power, form electric current.In theory, when primary pump 6 can obtain carrying current, the oxygen for entering chamber 4 is represented
Gas is all pumped out, and now thinks that the carrying current is corresponding with oxygen concentration, oxygen concentration is zero in residual gas.Two stage pump
7 constitute same carrying current pump with diffusion barrier 3, be now diffused into chamber 5 gas have passed through primary pump oxygen after
Residual gas.The accuracy of the carrying current of primary pump can be judged by the size of current of two stage pump：If two stage pump
Carrying current be zero, then be zero into oxygen concentration in the residual gas of two stage pump, then primary pump thoroughly pumps out oxygen；
If the electric current that two stage pump obtains is not zero, the oxygen concentration tested in residual gas is not zero, then the pump oxygen of primary pump is not complete
Into the electric current that primary pump measures can not represent oxygen concentration.
When two stage pump electric current judges the test result inaccuracy of primary pump electric current, pass through the additional power source electricity to primary pump
The adjustment of pressure, primary pump is set to reach capacity current status.Judge through two stage pump, if primary pump test result is qualified, now one
Level pump electric current can represent the actual concentration of oxygen in gas.
Example 2:
This example, as ion conductor, is adopted using testing NOx gas concentrations as explanation, current pump using oxygen ion conductor material
Pump electrode material is used as by the use of oxonium ion electrocatalysis material.
The device for measuring gas concentration is electrochemistry ceramic chip, and its structure is as shown in Figure 2.The device mainly include oxygen from
Sub- conductor matrix 1, gas passage, oxonium ion electrochemical pump unit and heating unit 12.As shown in Fig. 2 oxygen ion conductor matrix 1
Main material be oxygen ion conductor material, main function is the carrier of conduction oxonium ion after being ionized as oxygen.Gas
Passage includes diffusion barrier 2,3,17 and chamber 4,5,16.Gas passage function is to ensure that the smooth flow arrival electrochemistry of gas is anti-
Answer region, while the speed of the blocking structure limitation gas flowing as carrying current.Electrochemical pump unit is included along air flue
Primary pump 6, two stage pump 7 and the triplex 13 of the order arrangement of flowing.Oxonium ion electrochemical pump is by oxygen ion conductor and conductor
Catalysis electrode composition.Primary pump 6 is respectively 8,9 including inside and outside electrode, and two stage pump 7 includes inside and outside electrode 10,11, triplex
13 include inside and outside electrode 14,15.Interior electrode have chosen different materials：The platinum of the electrode selection suppression NO decomposition of I and II pump,
Alloy material, the electrode of triplex is from platinum, the rhodium alloy material for promoting NO to decompose.Heating unit 12 is generated heat by heater strip
Hot environment is provided to whole ceramic ionic conductor.
Test during NOx, make use of the operation principle of oxonium ion electrochemical pump, therefore oxygen is for test result precision
Have a great influence.Oxygen main source is：Free state oxygen decomposes caused oxygen under low oxygen condition with NO2 compounds.Cause
This removes free state oxygen first before NOx is tested, when oxygen all removals, then carry out NOx test.Therefore, the above is made pottery
The effect of each pump unit of porcelain core piece is：Primary pump is responsible for removing free oxygen, and two stage pump is responsible for judging whether free oxygen eliminates,
Triplex is responsible for NO decomposition and obtains NOx concentration.
The specific course of work introduced below：
Mixed gas reaches chamber 4 by diffusion barrier 2, has started pump and has removed the free oxygen stage.Primary pump 6 is in interior electrode 8
By Oxygen Adsorption under catalysis characteristics, and by dissociation, transhipment；Finally start outwards to transport oxygen under the voltage that external circuit applies
Ion.The oxonium ion that external electrode 9 comes as interior electrode to electrode, receiving conveying, and oxonium ion reduction is turned into oxygen,
And electronics is returned at external power, electric current is formed.In chamber 4, because oxygen is largely pumped out outward, the oxygen concentration drop in chamber
It is much lower.Under low oxygen condition, the NO2 in NOx compounds is decomposed into NO and O2.The process of pump oxygen is persistently carried out, finally
Realize that the NO2 in all NOx is converted into NO and O2, oxygen caused by NO2 points is also pumped out.During into next stage pump, mix
Close in gas and all pumped out in oxygen.
It is that two stage pump 7 moves that residual gas, which continues down one-level pump unit, and being now diffused into the gas of chamber 5 should be free of
Oxygen.Two stage pump 7 constitutes same carrying current pump with diffusion barrier 3, tests the content of oxygen.Pass through the big of two stage pump electric current
The pump oxygen result of the small electric current to primary pump judges：If the electric current of two stage pump is zero, into the residual gas of two stage pump
Middle oxygen concentration is zero, then primary pump thoroughly pumps out oxygen；If the electric current that two stage pump obtains is not zero, residual gas is tested
In oxygen concentration be not zero, then the pump oxygen of primary pump is not completed, and oxygen is also contained in tail gas.So by primary pump electricity
The adjustment of source voltage, primary pump is strengthened pump oxygen, all oxygen is pumped out.Judgement through two stage pump again, if obtained pole
Threshold currents, which reflect residual gas, does not have oxygen, then the course of work of primary pump is effective, and oxygen is completely removed, and entrance is next
Stage.
It is that triplex 13 moves that residual gas, which continues down one-level pump unit, is diffused into chamber 16, NO is comprised only in gas,
It is not oxygenous.Interior electrode 14 contains the material for promoting NO electrolysis.Triplex 13 constitutes same carrying current with diffusion barrier 17
Pump.In chamber 16, all NO are all electrolysed as N2 and O2.Because oxygen free gas has been divided, the pump oxygen of triplex 13
It is only caused by NO is decomposed that caused carrying current, which corresponds to O2,.Pass through the pump current value of triplex, it is possible to calculate NOx's
Concentration.
Linked and cooperated by multistage current pump, realize accurate measurement NOx concentration.Because two stage pump pumps out to primary pump
The reliability of free oxygen is judged that guarantee pumps out complete free oxygen, and it is accurate to ensure that triplex is measured NOx
Property.
Above content is to combine specific/preferred embodiment further description made for the present invention, it is impossible to is recognized
The specific implementation of the fixed present invention is confined to these explanations.For general technical staff of the technical field of the invention,
Without departing from the inventive concept of the premise, it can also make some replacements or modification to the embodiment that these have been described,
And these are substituted or variant should all be considered as belonging to protection scope of the present invention.
Claims (10)
1. a kind of device for measuring gas concentration, it is characterised in that including at least two-stage described at least two-stage current pump and connection
The current measuring device of current pump, at least two-stage current pump include one be sequentially connected along the flow direction of tested gas
Level pump and two stage pump, wherein the primary pump pumps out the tested gas of input to produce primary pump electric current by its electrode, it is described
Two stage pump pumps out remaining tested gas to produce two stage pump electric current, the current measuring device measurement described one by its electrode
Level pump electric current and the two stage pump electric current；Wherein adjust what is applied on the primary pump according to the size of the two stage pump electric current
Voltage, until the two stage pump electric current surveyed is not more than one close to zero preset value.
2. the device of measurement gas concentration as claimed in claim 1, it is characterised in that the two stage pump electric current surveyed is not more than one
The individual preset value close to zero refers to that surveyed two stage pump electric current is zero.
3. the device of measurement gas concentration as claimed in claim 1 or 2, it is characterised in that also include connecting the electric current survey
The voltage-operated device of device is measured, the voltage-operated device adjusts the primary pump according to the size of the two stage pump electric current
The voltage of upper application, until the two stage pump electric current surveyed is not more than one close to zero preset value.
4. the device of the measurement gas concentration as described in any one of claims 1 to 3, it is characterised in that the measurement gas is dense
The device of degree is measures the device of oxygen concentration, and at least two-stage current pump is formed on oxygen ion conductor matrix, wherein institute
State primary pump and produce primary pump electric current by pumping out the oxygen of input, the two stage pump is produced by pumping out remnants oxygen
Two stage pump electric current；When the two stage pump electric current that the current measuring device is surveyed no more than one close to zero preset value when, it is described
The primary pump electric current that current measuring device is surveyed is used for the concentration for characterizing oxygen.
5. the device of measurement gas concentration as claimed in claim 4, it is characterised in that the primary pump and the two stage pump
Interior electrode is platinum or platinum alloy material.
6. the device of the measurement gas concentration as described in any one of claims 1 to 3, it is characterised in that the measurement gas is dense
The device of degree is the device of measurement NOx gas concentrations, and at least two-stage current pump is formed on oxygen ion conductor matrix, described
At least two-stage current pump also includes being connected to the triplex after the two stage pump, and the interior electrode of the triplex, which contains, promotes NO
The material of electrolysis, wherein the primary pump pumps out in the gas of input free oxygen to produce primary pump electric current, institute by its electrode
State two stage pump and remnants free oxygen is pumped out to produce two stage pump electric current by its electrode, the triplex will be by by its electrode
All electrolysis is N2 and O2 to the NO that NOx decomposes to obtain, and pumps out oxygen caused by electrolysis and produce triplex electric current；When the electricity
The two stage pump electric current that flow measuring apparatus is surveyed no more than one close to zero preset value when, the current measuring device surveyed three
Level pump electric current is used for the concentration for characterizing NOx gases.
7. the device of measurement gas concentration as claimed in claim 6, it is characterised in that the primary pump and the two stage pump
Interior electrode is the material for the decomposition that can suppress NO.
8. the device of measurement gas concentration as claimed in claim 7, it is characterised in that the primary pump and the two stage pump
Interior electrode is platinum alloy material, and the interior electrode of the triplex is platinum-rhodium alloy material.
9. the device of the measurement gas concentration as described in any one of claim 6 to 8, it is characterised in that also include being arranged on institute
State the heating unit on oxygen ion conductor matrix.
A kind of 10. method for measuring gas concentration, it is characterised in that surveyed using the device as described in any one of claim 1 to 9
Measure gas concentration.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711263048.1A CN107764885B (en) | 2017-12-04 | Apparatus and method for measuring gas concentration | |
| PCT/CN2018/115108 WO2019109782A1 (en) | 2017-12-04 | 2018-11-13 | Device and method for measuring gas concentration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711263048.1A CN107764885B (en) | 2017-12-04 | Apparatus and method for measuring gas concentration |
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| CN107764885A true CN107764885A (en) | 2018-03-06 |
| CN107764885B CN107764885B (en) | 2024-06-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019109782A1 (en) * | 2017-12-04 | 2019-06-13 | 深圳市森世泰科技有限公司 | Device and method for measuring gas concentration |
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| WO2019109782A1 (en) | 2019-06-13 |
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