CN106970182A - A kind of apparatus and method of on-line checking mixed gas concentration - Google Patents
A kind of apparatus and method of on-line checking mixed gas concentration Download PDFInfo
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- CN106970182A CN106970182A CN201710265284.0A CN201710265284A CN106970182A CN 106970182 A CN106970182 A CN 106970182A CN 201710265284 A CN201710265284 A CN 201710265284A CN 106970182 A CN106970182 A CN 106970182A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 69
- 238000005070 sampling Methods 0.000 claims abstract description 27
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- 238000001914 filtration Methods 0.000 claims description 9
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- 239000003500 flue dust Substances 0.000 claims description 2
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- 238000007689 inspection Methods 0.000 claims 2
- 239000000203 mixture Substances 0.000 claims 2
- 238000005259 measurement Methods 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
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- 238000012544 monitoring process Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 152
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 14
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulfur dioxide Inorganic materials O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 10
- 239000003546 flue gas Substances 0.000 description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 7
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 6
- 229910002091 carbon monoxide Inorganic materials 0.000 description 6
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 241000894007 species Species 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 238000004868 gas analysis Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- YBNMDCCMCLUHBL-UHFFFAOYSA-N (2,5-dioxopyrrolidin-1-yl) 4-pyren-1-ylbutanoate Chemical compound C=1C=C(C2=C34)C=CC3=CC=CC4=CC=C2C=1CCCC(=O)ON1C(=O)CCC1=O YBNMDCCMCLUHBL-UHFFFAOYSA-N 0.000 description 1
- 229910002899 Bi2Te3 Inorganic materials 0.000 description 1
- 241001269238 Data Species 0.000 description 1
- 229910002665 PbTe Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005059 dormancy Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- OCGWQDWYSQAFTO-UHFFFAOYSA-N tellanylidenelead Chemical compound [Pb]=[Te] OCGWQDWYSQAFTO-UHFFFAOYSA-N 0.000 description 1
- 239000004408 titanium dioxide Substances 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
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
-
- 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
- G01N27/403—Cells and electrode assemblies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0031—General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0037—NOx
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/004—CO or CO2
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0042—SO2 or SO3
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Molecular Biology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The present invention relates to environmental monitoring, specifically a kind of apparatus and method of on-line checking mixed gas concentration.Including detection means casing, gas sampling unit, gas concentration detection sensor array element, gas circuit control unit, electrical control and information process unit, it is characterised in that：Provided with gas sampling unit, gas concentration detection sensor array element, gas circuit control unit and electrical equipment control and information process unit in the detection means casing, the gas sampling unit is made up of air inlet pipeline, filter, miillpore filter, steam trap and secondary filter, and filter, miillpore filter, steam trap and secondary filter are sequentially provided with from left to right in the shell of the gas sampling unit.The present invention compared with the existing technology, with fast response time, measurement accuracy high, stability and it is reproducible the features such as.The concentration of each gas effectively can be accurately detected, its concentration can be shown in real time.
Description
Technical field
The present invention relates to environmental monitoring, the device of specifically a kind of on-line checking mixed gas concentration and side
Method.
Background technology
With the development of society, economic total volume rapid development, while required resource and energy resource consumption are also in sustainable growth,
Destruction to environment is also increasingly severe.The energy resource consumption of China and environmental pollution situation are on the rise in recent years, pollutant row
Put total amount to continue to increase, more than the self-purification ability of enviroment；Especially for generating, metallurgy, petrochemical industry, coal chemical industry, cement, heat supply,
The boiler emissions such as various fire coals, fuel oil, the combustion gas of the industries such as garbage disposal, road traffic safety management, field of environmental protection detection, are needed
Timely and effectively to monitor and administer.Such as boiler smoke, oxygen, nitrogen, carbon dioxide, carbon monoxide, titanium dioxide are mainly contained
The gases such as sulphur, nitrogen dioxide, nitric oxide, seem to the on-line checking of its concentration in the purification treatment and discharge process of flue gas
It is particularly significant, therefore development high sensitivity, the online gas concentration detector of low cost also seem very urgent.
The measurement of gas concentration is mainly measured using the sensor of all kinds of gas concentration measurements, and sensor includes electricity
Chemistry, semiconductor, photoion, laser, infrared sensor etc..Infrared can also be used to the characteristic absorption performance of light by gas
Or ultraviolet spectral technique etc. is measured.For specific gas, either using sensor or spectral technique can all obtain compared with
Accurate concentration measurement.And measurement can be influenced each other when multiple gases are mixed, between each gas so that sensor or light
The value error of gas concentration measured by spectral method is larger, when desulphurization denitration is purified especially in flue gas, for actual mixed gas
The concentration value of on-line checking to be then difficult measurement accurate.Major part gas analysis or on-line measurement use spectral technique at present, main
Irradiation scanning is carried out to gas by spectrophotometer, gas with various can produce characteristic absorption peak in different wavelength range, pass through
The light excited gas molecule of different wave length can obtain the absworption peak of different wavelength, can by the analysis to wavelength and peak strength
Obtain the value of accurate gaseous species and concentration.This technical scheme is more ripe, is mainly used in gas analysis field, but set
Standby structure is more complicated and cost is higher, limits the scale application in its on-line checking field.According to sensor technology to gas
Bulk concentration is measured, and is manufactured because of a kind of gas characteristic of sensor correspondence, for pure gas measurement of concetration compared with
Accurately, tester is compact and with low cost, but for each gas concentration measurement of mixed gas, because each gas is to sensor
The problems such as interfering then is difficult to survey accurate, also limit its application in gas concentration on-line checking field.Such as patent of invention
1866027B discloses a kind of integrated gas online detector, mainly by osmosis dehydrater and fine filter to quilt
Detection gas in steam and dust be removed after mixed gas concentration is measured, and each gas to the phase of measurement
Mutually influence is not analyzed and handled, and more difficult each gas concentration in mixed gas is accurately measured.
The content of the invention
The present invention is overcomes the deficiencies in the prior art, based on designing a kind of sensing technology to separate gaseous species
Gas on-line measuring device and method, can accurately measure the concentration value of each gas in mixed gas, and integral device system into
This is cheap, can on-line checking field of the scale applied to mixed gas concentration.
To achieve the above object, a kind of device of on-line checking mixed gas concentration, including detection means casing, gas are designed
Sampler body unit, gas concentration detection sensor array element, gas circuit control unit, electrical control and information process unit, its
It is characterised by：Gas sampling unit, gas concentration detection sensor array element, gas circuit control are provided with the detection means casing
Unit processed and electrical equipment control and information process unit, the right side of the gas sampling unit is provided with gas concentration detection sensor battle array
Column unit, the right side of gas concentration detection sensor array element is provided with gas circuit control unit, the gas sampling unit, gas
Concentration detection sensor array element and gas circuit control unit are connected on electrical control and information process unit；The gas
Sampler body unit is made up of air inlet pipeline, filter, miillpore filter, steam trap and secondary filter, the gas sampling
Filter, miillpore filter, steam trap and secondary filter, the air inlet pipe are sequentially provided with the shell of unit from left to right
Road sequentially passes through filter, miillpore filter, steam trap and secondary filter and connects gas concentration detection biography from left to right
Sensor array element；The gas concentration detection sensor array element is made up of several detection sensors and some filter membranes,
Several detection sensors placed side by side are sequentially provided with the housing of gas concentration detection sensor array element from left to right,
A filter membrane is arranged with respectively outside each detection sensor, the gas concentration detection sensor array above detection sensor
Discharge duct is provided with the shell of unit, the discharge duct connects gas circuit control unit.
The left end of the air inlet pipeline runs through the shell of gas sampling unit and exposed outside gas sampling unit.
The electrical control is provided with several data transmission interfaces and several signal output interfaces with information process unit,
Electrical control is connected gas sampling unit, gas detection sensor array element with information process unit by data transmission interface
With gas circuit control unit.
The data transmission interface can be using any of standard data delivery interfaces such as RS-485, RS-232；It is described
Signal output interface includes any of LCD, LED.
The detection means casing is made up of any of aluminum alloy materials, polymer composites.
The pore diameter range of the filter is 1-250nm, and the pore diameter range of miillpore filter is 0-1nm.
Filter membrane outside the detection sensor is bigger from admission line more distal apertures footpath, and the pore diameter range of filter membrane is 0.3nm-
1nm。
A kind of detection method of the device of on-line checking mixed gas concentration, it is characterised in that comprise the following steps：
1）Step 1, according to sample gas and needing the gas classification of detectable concentration, the thing in gas concentration detection sensor array element
The gas detection sensor for sample gas is first placed, and the filter membrane matched is set outside gas detection sensor；
2）Step 2, the sample gas for needing to carry out sampling analysis is drawn by the air inlet pipeline of gas sampling unit, sample throughput is
1L/min；
3）Step 3, sample gas sequentially passes through filter, miillpore filter and steam trap, and sample gas is in filter and miillpore filter
Filtering smoke, sample gas carries out the separation of steam in steam trap；
4）Step 4, the sample gas separated by filtering smoke and steam is further thin by what is contained in sample gas by secondary filter
Grit is filtered again, and then the sample gas further after filtering inputs gas concentration detection sensor array by admission line
In unit；
5）Step 5, after sample gas input gas concentration detection sensor array element, the gas point after membrane filtration in sample gas
Do not detected by gas detection sensor；
6）Step 6, gas detection sensor respectively exports the content detection result of the tested gas in sample gas to electrical control
With information process unit, and testing result is exported by electrical control and information process unit.
Sample gas carries out the detection of flow using gas mass flow rate sensors MFC in extraction process in the step 1,
And sample gas is in extraction process, under gas mass flow rate sensors MFC control, keep the pressure of sample gas constant.
The scope of sample temperature degree is 0-200 DEG C in the step 1, and temperature survey uses Pt100 temperature sensors, temperature
Precision controlling is at ± 1 DEG C.
The present invention compared with the existing technology, with fast response time, measurement accuracy high, stability and the spy such as reproducible
Point.The concentration of each gas effectively can be accurately detected, its concentration can be shown in real time.
Brief description of the drawings
Fig. 1 is structural representation of the invention.
Referring to Fig. 1, wherein, 1 is gas sampling unit, and 2 be gas concentration detection sensor array element, and 3 be gas circuit control
Unit processed, 4 be electrical control and information process unit, and 10 be air inlet pipeline, and 11 be filter, and 12 be miillpore filter, and 13 be water
Vapour separator, 14 be secondary filter, and 20 be discharge duct, and 21 be detection sensor, and 211 be filter membrane.
Embodiment
The invention will now be described in further detail with reference to the accompanying drawings.
As shown in figure 1, detected gas obtains the mixing of no solid grit by air inlet pipeline 10 by filter 11
Gas, the millipore filter for being mainly less than 250nm using aperture is filtered to sample gas.According to contained by tested gas
Grit number can carry out one or more levels filtering obtain sample gas.Sample gas temperature is no more than 50 DEG C.If gas temperature
Compare high, when simultaneously containing steam, can separate steam with tested gas by miillpore filter 12, the aperture of miillpore filter 12 exists
Below 1nm, material can be polytetrafluoroethylene (PTFE) or carbon film.It is mixed gas in the inner side of miillpore filter 12, outside pressure is relatively interior
Side is negative pressure, can make gas that inner side hydrone be infiltrated into outside by miillpore filter 12 in flow process and taken away.High temperature
Gas uses microporous barrier diffusive separation, while gas temperature can pass through filter 11 and micropore filter when too high in air inlet pipeline 10
Radiator is added to reduce gas temperature in film 12., can be periodically to filter after a period of time for the filter of sample gas
Core is carried out can Reusability after backwash regeneration.
It is very sensitive to the steam being mixed into when being measured because of mixed gas concentration, if contain a small amount of steam in sample gas,
Remaining steam in gas can further be separated using steam trap 13 and removed.It is main cold using being carried out after semiconductor refrigerating
Solidifying separation, i.e., using glass note that effect-electrothermal refrigeration, by giving semiconductor cooling device to power up power so that contacted with gas
The temperature of cold end when being down to 4 DEG C, may be such that steam in mixed gas, to produce condensation gentle by water because the temperature difference is larger
Body is separated, and is discharged aqueous water by condensed water row's mouth.Your semiconductor cooling device of the glass note used is by Bi2Te3、
PbTe、PbS、PbSe、Cu2Se、Cu2The device that one or more in the materials such as S, SnSe, SnS are constituted.
Detected mixed gas after steam separation can also be by secondary filter 14 further by can in mixed gas
After the dustshot that can contain is filtered, sensor array detection unit 2 is entered by admission line 10.Biography with microporous barrier
Sensor sensing chamber is connected the air pressure in discharge duct 20 with admission line 10 and discharge duct 20 less than the gas in admission line 10
Pressure, may be such that gas is easy to be measured in real time by the sensor sensing chamber of microporous barrier.It is big according to the molecule of detected gas
It is small, the gas-selectively filter membrane or molecular screen membrane 211 of different pore size are added in the front end of some detection sensors 21, fenestra is filtered
Become big successively through size, and in 0.3nm-1nm ranges, micropore filtering film that can be using polytetrafluoroethylene (PTFE) or carbon and oxidation
At least one of the molecular sieve of thing.Order such as detected gas in boiler smoke is NO, CO2,O2,N2,CO,NO2,SO2Deng.Such as
Shown in Fig. 1, sensor can be sorted using array format by above-mentioned gas species, and such as the first gas is taken out through miillpore filter 211
Its concentration can be surveyed to sensor 21；Second of gas is pumped down to sensor 22 through miillpore filter 222 can survey its concentration；The third gas
Body is pumped down to sensor 23 through miillpore filter 233 can survey its concentration；Other gases the like can measure the concentration of each gas.Adopt
Molecular size separating and measuring can be pressed to mixed gas, reduce each gas and surveyed sensor is interfered with this scheme, can
Obtain accurate gas concentration measurement.Gas after being measured through sensor array can be arranged tail gas by discharge duct 20
Go out.
The parameters such as pumping, filtering, exhaust, air pressure, flow velocity, the flow of tested gas are including supporting by gas circuit control unit 3
Valve, pump, pipeline etc., carry out the control that overall gas measures technique.Gas flow is controlled using mass flow controller；
The air pressure of sample gas may be such that the pressure of tested gas keeps permanent by the control of gas pressure sensor, the pumping speed of pump and valve
It is fixed, it can so obtain accurate gas concentration change.
All gas sampling unit 1, gas detection sensor array element 2, gas circuit control unit 3 are and electrical control
It is connected with signal processing unit 4.Electrical control possesses power supply, signal acquisition, analysis, output, display etc. with signal processing unit 4
Function.Sensor, which surveys electric signal, by the analog signal gathered to be converted into numeral by signal acquisition and CPU
Data are stored, shown or transmitted in real time by signal.In test process, flow, temperature of gas etc. can be to test datas
Have an impact, therefore the flow and temperature of gas can be measured in real time by gas flow and temperature sensor while gas concentration measurement
Degree.Data can be calibrated and handled according to the change of each parameter by central control unit, obtain accurately each gas dense
Number of degrees value.Electrical control and data transmission interface such as RS-485, RS-232 that standard is provided with signal processing unit 4, can be carried out
Wired or wireless data transfer.
Embodiment：
Application of the present invention in the on-line checking of desulphurization denitration flue gas.
Contain sulfur dioxide and nitrogen oxide mostly in the application in fields such as fire coal, fuel oil, combustion gas, the flue gas discharged
Deng pernicious gas, generally require and discharged again after desulphurization denitration is handled.Therefore the on-line checking of gas concentration in flue gas is seemed
It is particularly significant.
The present invention, can be to the sulfur dioxide in desulphurization denitration flue gas, an oxygen during desulphurization denitration flue gas is detected
The gas concentration for changing nitrogen, nitrogen dioxide, carbon monoxide, oxygen etc. is measured.First by gas using unit 1 by flue gas
Flue dust and steam filtered and separated.Gas sampling mode is pump suction type, and sample throughput is 1L/min, using gaseous mass
Flow sensor MFC carries out the measurement of flow.Controlled by the pumping speed of pump, may be such that the pressure of collected sample gas keeps constant.
Smoke temperature change scope is 0~200 DEG C, and temperature survey uses Pt100 temperature sensors, and precision is ± 1 DEG C.Using electrochemistry
Formula fuel cell type sensor is measured to each gas concentration.Detected gas sorts：Nitric oxide (NO), oxygen (O2)、
Carbon monoxide (CO), nitrogen dioxide (NO2), sulfur dioxide (SO2).Measure concentration range NO, CO, NO2、SO2For 0~
5000ppm, resolution ratio is 0.5ppm；O2Concentration range is 0~30%, and resolution ratio is 0.1%.Response time T90<10S.Detection dress
It is AC185~255V, Overall Power Consumption that the electrical characteristic put, which includes input service voltage,<50W, power consumption during dormancy<1W.Signal output
Interface shows including LCD, RS-485 standard interfaces；Using two-wire system, current range is 4-20mA, and signal output possesses wired biography
Defeated or wireless remote function.Detection means tank material uses aluminium alloy or polymer composites, and gross weight is no more than 2kg,
It can use and mount or vertically-mounted installation, degree of protection is more than IP65.Detector operating temperature range is -20 DEG C~55 DEG C；Work
Make humidity range for 15~90%RH (relative humidity）, it is non-condensing type；Tested gas pressure is 1 atmospheric pressure ± 10%.
Claims (10)
1. a kind of device of on-line checking mixed gas concentration, including detection means casing, gas sampling unit, gas concentration inspection
Survey sensor array element, gas circuit control unit, electrical control and information process unit, it is characterised in that：The detection means
Gas sampling unit is provided with casing（1）, gas concentration detection sensor array element（2）, gas circuit control unit（3）And electrical equipment
Control and information process unit（4）, the gas sampling unit（1）Right side be provided with gas concentration detection sensor array element
（2）, gas concentration detection sensor array element（2）Right side be provided with gas circuit control unit（3）, the gas sampling unit
（1）, gas concentration detection sensor array element（2）With gas circuit control unit（3）It is connected at electrical control and information
Manage unit（4）On；The gas sampling unit（1）By air inlet pipeline（10）, filter（11）, miillpore filter（12）, steam point
From device（13）And secondary filter（14）Composition, the gas sampling unit（1）Shell in be sequentially provided with filtering from left to right
Device（11）, miillpore filter（12）, steam trap（13）And secondary filter（14）, the air inlet pipeline（10）From left to right according to
It is secondary to pass through filter（11）, miillpore filter（12）, steam trap（13）And secondary filter（14）And connect gas concentration inspection
Survey sensor array element（2）；The gas concentration detection sensor array element（2）By several detection sensors（21）With
Some filter membranes（211）Composition, gas concentration detection sensor array element（2）Housing in be sequentially provided with several from left to right
The detection sensor placed side by side（21）, each detection sensor（21）It is outer to be arranged with a filter membrane respectively（211）, positioned at detection
Sensor（21）The gas concentration detection sensor array element of top（2）Shell in be provided with discharge duct（20）, the row
Feed channel（20）Connect gas circuit control unit（3）.
2. a kind of device of on-line checking mixed gas concentration as claimed in claim 1, it is characterised in that：The air inlet pipeline
（10）Left end run through gas sampling unit（1）Shell and expose in gas sampling unit（1）Outside.
3. a kind of device of on-line checking mixed gas concentration as claimed in claim 1, it is characterised in that：The electrical control
With information process unit（4）Provided with several data transmission interfaces and several signal output interfaces, at electrical control and information
Manage unit（4）Gas sampling unit is connected by data transmission interface（1）, gas detection sensor array element（2）And gas circuit
Control unit（3）.
4. a kind of device of on-line checking mixed gas concentration as claimed in claim 3, it is characterised in that：The data transfer
Interface can be using any of standard data delivery interfaces such as RS-485, RS-232；The signal output interface include LCD,
Any of LED.
5. a kind of device of on-line checking mixed gas concentration as claimed in claim 1, it is characterised in that：The detection means
Casing is made up of any of aluminum alloy materials, polymer composites.
6. a kind of device of on-line checking mixed gas concentration as claimed in claim 1, it is characterised in that：The filter
（11）Pore diameter range be 1-250nm, miillpore filter（12）Pore diameter range be 0-1nm.
7. a kind of device of on-line checking mixed gas concentration as claimed in claim 1, it is characterised in that：The detection sensing
Device（21）Outer filter membrane（211）From admission line（10）More distal apertures footpath is bigger, filter membrane（211）Pore diameter range be 0.3nm-1nm.
8. a kind of a kind of detection method of the device of on-line checking mixed gas concentration as claimed in claim 1, its feature exists
In comprising the following steps：
Step 1, according to sample gas and the gas classification of detectable concentration is needed, in gas concentration detection sensor array element in advance
The gas detection sensor for sample gas is placed, and the filter membrane matched is set outside gas detection sensor；
Step 2, the sample gas for needing to carry out sampling analysis is drawn by the air inlet pipeline of gas sampling unit, sample throughput is 1L/
min；
Step 3, sample gas sequentially passes through filter, miillpore filter and steam trap, sample gas mistake in filter and miillpore filter
Flue dust is filtered, sample gas carries out the separation of steam in steam trap；
Step 4, the sample gas separated by filtering smoke and steam passes through the thin dirt that secondary filter will further contain in sample gas
Grain is filtered again, and then the sample gas further after filtering inputs gas concentration detection sensor array list by admission line
In member；
Step 5, after sample gas input gas concentration detection sensor array element, the gas difference after membrane filtration in sample gas
Detected by gas detection sensor；
Step 6, gas detection sensor respectively by the content detection result of the tested gas in sample gas export to electrical control with
Information process unit, and testing result is exported by electrical control and information process unit.
9. a kind of detection method of the device of on-line checking mixed gas concentration as claimed in claim 8, it is characterised in that：Institute
State sample gas in step 1 and in extraction process, the detection of flow is carried out using gas mass flow rate sensors MFC, and sample gas exists
In extraction process, under gas mass flow rate sensors MFC control, keep the pressure of sample gas constant.
10. a kind of detection method of the device of on-line checking mixed gas concentration as claimed in claim 8, it is characterised in that：
The scope of sample temperature degree is 0-200 DEG C in the step 1, and temperature survey uses Pt100 temperature sensors, the precision controlling of temperature
At ± 1 DEG C.
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|---|---|---|---|
| CN201710265284.0A CN106970182A (en) | 2017-04-21 | 2017-04-21 | A kind of apparatus and method of on-line checking mixed gas concentration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710265284.0A CN106970182A (en) | 2017-04-21 | 2017-04-21 | A kind of apparatus and method of on-line checking mixed gas concentration |
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| Publication Number | Publication Date |
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| CN106970182A true CN106970182A (en) | 2017-07-21 |
Family
ID=59332462
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|---|---|---|---|
| CN201710265284.0A Withdrawn CN106970182A (en) | 2017-04-21 | 2017-04-21 | A kind of apparatus and method of on-line checking mixed gas concentration |
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Application publication date: 20170721 |