CN205538861U - Volatile organic compounds on -line monitoring system - Google Patents
Volatile organic compounds on -line monitoring system Download PDFInfo
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- CN205538861U CN205538861U CN201521031850.4U CN201521031850U CN205538861U CN 205538861 U CN205538861 U CN 205538861U CN 201521031850 U CN201521031850 U CN 201521031850U CN 205538861 U CN205538861 U CN 205538861U
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Abstract
The application discloses volatile organic compounds on -line monitoring system includes: sampling probe, heat tracing pipe, pretreatment systems, monitoring host computer, sampling pipeline, carrier gas pipeline, carrier gas air supply, gas air supply, combustion -supporting gas air supply and data processing display element, wherein, sampling probe and pretreatment systems are connected through heat tracing pipe, pretreatment systems is connected with sampling probe and monitoring host computer respectively, monitoring host computer is connected with pretreatment systems, carrier gas air supply, gas air supply, combustion -supporting gas air supply and data processing display element respectively, the carrier gas air supply is connected with monitoring host computer, the gas air supply is connected with monitoring host computer, combustion -supporting gas air supply is connected with monitoring host computer, data processing display element is connected with monitoring host computer. The utility model discloses obtaining a set of sample data in the longest 15 minutes to the benzene series thing, having higher temporal resolution, its operation is low with the maintenance cost, and maneuverability is strong, the volatile organic compounds's that is particularly suitable for discharging in fixed source continuous automatic on -line detection.
Description
Technical field
This utility model relates to gas monitoring techniques field, specifically, relate to a kind of can the system of on-line monitoring volatile organic matter concentration continuously.
Background technology
Definition according to World Health Organization (WHO), volatile organic matter (volatile organic compounds, VOCs) refer to boiling point 50 250 DEG C, under room temperature saturated vapour pressure more than 133.32Pa, the type organic that is present in air the most in vapour form.VOCs has wider polarity and concentration range, has carcinogenic, teratogenesis, mutagenesis to human body and cause leukemic danger under certain concentration.VOCs is the decisive precursor of photochemical fog, is also the main producers thing of PM2.5.VOCS measurement data is to study it to environment and the basis of Human health effects reliably.VOCs owing to monitoring is affected by source change, chemical reaction process and the factor such as sampling time and persistent period.So, only just can be disclosed feature and the general trend of the change of VOCs concentration level by long-continued monitoring, provide scientific basis for environmental Kuznets Curves.
The current most widely used VOCs method of sampling is the sampling of stainless cylinder of steel, adsorbent sampling, airbag sampling and condensation at low temperature sampling.The sample gathered has to pass through the methods such as Solid-Phase Extraction, the solvent analysis, low temperature pre-concentration Thermal desorption to carry out and processes.Sample analysis relies primarily on gas chromatography, high performance liquid chromatography, gas chromatography-mass spectrum, fluorescence spectrophotometry etc..In prior art, the monitoring of VOCs is yet suffered from problems with:
1) all there is certain defect, such as in the current various method of samplings during sampling: airbag sampling is owing to inwall exists absorption and resolves effect, the most multiplex；Rustless steel sample can carries out adsorbent concentration after needing to send laboratory back to or low temperature pre-concentration processes, although penetrating and artificial pollution when adsorbent can be avoided to sample, but is by repeatedly analyzing, and costly, needs complicated equipment to clean.Although adsorbent sampling and low temperature samples are while sampling, can with the pre-concentration of complete paired samples, however it is necessary that low-temperature transport, deposit.
2) above-mentioned sample collection method is used just have to can be used to analyze through the pretreatment of sample, owing to sample can be caused artificial pollution by the process complexity of pretreatment and the manual intervention when pretreatment unavoidably, whole Period Process is long, and can bring certain error.
3) for the detection of volatile organic matter, most common method is gas chromatography and gas chromatography-mass spectrography at present, but mostly use off-line analysis technology, temporal resolution is low, cannot react the concentration of various material compositions fine change in time in VOCs, the technology of personnel is required higher by sampling analysis process simultaneously.
In China, the research to volatile organic matter is started late, and the collection analysis of volatile organic matter is relied primarily on external large-scale analytical equipment and instrument, the most expensive, and it is numerous and diverse to analyze process, samples and the temporal resolution analyzed is very poor, still have bigger gap with being actually needed.
So, the method of sampling of research a new generation VOCs and analytical technology, development high sensitivity, easy and simple to handle, the economic and practical and VOCs analyser that is easily maintained, develop VOCs on-line continuous Automatic Measurement Technique, have great importance in volatile organic matter study on monitoring field.
Utility model content
For solving above-mentioned technical problem, this utility model provides a kind of volatile organic matter on-line monitoring system, it is characterized in that, including: sampling probe, heat tracing pipe, pretreatment system, monitoring main frame, sample lines, gas-carrier pipeline, carrier gas source of the gas, gas source, help gas source and data to process display unit, wherein
Described sampling probe, is connected by heat tracing pipe with described pretreatment system, enters pretreatment system after being used for gathering sample gas；
Described pretreatment system, is connected with described sampling probe and monitoring main frame respectively, enters monitoring main frame, control including dedusting, dehumidifying and stream after the sample gas gathered carries out pretreatment；
Described monitoring main frame, respectively with described pretreatment system, carrier gas source of the gas, gas source, help gas source and data to process display unit to be connected, for pretreated sample gas is carried out concentration analysis, sample gas is separated mutually by fixing in the gas chromatographic column in monitoring main frame, the detector that sample after separation enters in monitoring main frame gathers signal, sends extremely described data through signal amplifier and process display unit after gathering signal；
Described carrier gas source of the gas, is connected with described monitoring main frame, for providing carrier gas for monitoring main frame；
Described gas source, is connected with described monitoring main frame, for providing combustion gas for monitoring main frame；
Described help gas source, be connected with described monitoring main frame, for providing combustion-supporting gas for monitoring main frame；Described data process display unit, are connected with described monitoring main frame, for receiving the signal that the detector in monitoring main frame gathers, carry out computational analysis.
Preferably, described pretreatment system, including parallel sample gas pretreatment stream and gas pretreatment stream, wherein,
Described sample gas pretreatment stream, for sample gas is carried out pretreatment, including: dust filter unit, air compressor machine, condenser, peristaltic pump, sampling pump, flow channel switching valve, sample gas accurate filter, needle valve, by-pass gauge, flow stabilizing valve, sample introduction effusion meter and atmospheric equilibrium valve, wherein, by-pass gauge, flow stabilizing valve, sample introduction effusion meter and atmospheric equilibrium valve share with described gas pretreatment stream；
Described dust filter unit, is connected with described condenser, is also connected by back-flushing valve with described air compressor machine, is used for removing particulate matter in sample gas；
Described air compressor machine, is connected by back-flushing valve with described dust filter unit, is used for providing purge gas, blowback pipeline from sampling probe to pretreatment system；
Described condenser, is connected with described dust filter unit, peristaltic pump and sampling pump respectively, for sample gas is carried out dehumidification treatments；
Described peristaltic pump, is connected with described condenser, for getting rid of the cooling water in condenser；
Described sampling pump, is connected with described condenser and described flow channel switching valve respectively, is used for extracting sample gas；
Described flow channel switching valve, is connected with sampling pump, sample gas accurate filter, needle valve respectively, for sample gas pretreatment stream and the switching of gas pretreatment stream；
Described sample gas accurate filter, is connected with described flow channel switching valve and described flow stabilizing valve respectively, for removing particulate matter tiny in sample gas；
Described needle valve, is connected with described flow channel switching valve and by-pass gauge respectively, for adjusting the sample gas flow being flowed into by-pass gauge；
Described by-pass gauge, is connected with the needle valve in described needle valve and gas pretreatment stream, for showing the flow of vent gas；
Described flow stabilizing valve, is connected with the accurate filter of described sample gas accurate filter and gas pretreatment stream, for stably entering the gas flow of monitoring main frame；
Described sample introduction effusion meter, is connected with described flow stabilizing valve and described atmospheric equilibrium valve respectively, for showing access into the flow of monitoring main frame；
Described atmospheric equilibrium valve, is connected with the electric multi-way valve in described sample introduction effusion meter and monitoring main frame, respectively for stably entering into the air pressure of the gas in described electric multi-way valve；
Described gas pretreatment unit, for gas is carried out pretreatment, including: filter, flow channel switching valve, gas accurate filter, needle valve and by-pass gauge, flow stabilizing valve, sample introduction effusion meter and the atmospheric equilibrium valve shared with described sample gas pretreatment stream, wherein
Described filter, is connected with described flow channel switching valve, for removing the particulate matter in gas；
Described flow channel switching valve, is connected with described filter, described gas accurate filter and described needle valve respectively, the switching between gas pretreatment stream and sample gas pretreatment stream；
Described needle valve, is connected in parallel on by-pass gauge with the needle valve of sample gas pretreatment stream, for adjusting the gas flow being flowed into by-pass gauge.
Preferably, described monitoring main frame, including post case, electric multi-way valve, detector, signal output, carrier gas inlet, fuel gas inlet, help fuel gas inlet, sample gas import, sample gas outlet and offgas outlet, wherein,
Described post case, inside sets gas chromatographic column, is connected with described electric multi-way valve and detector respectively, for the various components in the admixture of gas needing monitoring being separated；
Described carrier gas inlet, is positioned on the backplate of monitoring main frame, is connected with described carrier gas source of the gas and electric multi-way valve, for described gas chromatographic column delivery of carrier gas；
Described fuel gas inlet, is positioned on the backplate of monitoring main frame, is connected with described gas source and detector, for described detector delivery of fuel gas；
Described help fuel gas inlet, be positioned on the backplate of monitoring main frame, help gas source and detector to be connected with described, for the described detector combustion-supporting gas of conveying；
Described sample gas import, is positioned on the backplate of monitoring main frame, is connected with described pretreatment system and electric multi-way valve, the sample gas after processing to described electric multi-way valve input pretreatment system；
Described sample gas exports, and is positioned on the backplate of monitoring main frame, is connected with described electric multi-way valve, for exporting the unnecessary sample gas not entering into gas chromatographic column；
Described offgas outlet, is positioned on monitoring main frame top cover, is in the surface of detector, for discharging the gas after detector detects；
Described electric multi-way valve is connected by sample gas import with pretreatment system, is connected by carrier gas inlet with carrier gas source of the gas, is joined directly together with the gas chromatographic column in described post case and connects, for quantitatively entering the sample gas flow of gas chromatographic column；
Described detector, is connected with signal output after signal amplifier, sends to signal output after being used for gathering signal and being amplified by signal amplifier；
Described signal output, processes display unit with described signal amplifier and data respectively and is connected, and the signal for being amplified by signal amplifier sends to data process display unit.
Preferably, described post case, also include: aluminum heat block, described gas chromatographic column is coiled on described aluminum heat block, described aluminum heat block is for heating gas chromatographic column.
Preferably, described aluminum heat block, further, it is provided with at least 2 holes below, is used for placing heating rod and temperature sensor, described heating rod is for heating to aluminum heat block, and described temperature sensor is for gathering the temperature signal of aluminum heat block.
Preferably, described aluminum heat block, further, it is provided with thermal insulation board about, described thermal insulation board is for being incubated described aluminum heat block, and thermal insulation board is provided with two apertures, and the input of gas chromatographic column and outfan are each passed through said two aperture.
Preferably, described post case, further, it is provided with a post case lid, for double-decker, internal layer is heat-insulation layer, and outer layer is rustless steel outer housing.
The volatile organic matter on-line monitoring system that this utility model is taked, it has monitoring main frame, and described monitoring main frame includes post case, electric multi-way valve, detector, carrier gas inlet, fuel gas inlet, helps fuel gas inlet, sample gas import, sample gas outlet and offgas outlet.Wherein, described post case, inside set gas chromatographic column, be connected with described electric multi-way valve and detector respectively.Described electric multi-way valve is connected by sample gas import with pretreatment system, is connected by carrier gas inlet with carrier gas source of the gas, is joined directly together with the chromatographic column in described post case and connects.Described detector, is connected with signal output after signal amplifier.Described signal output, processes display unit with described signal amplifier and data respectively and is connected.
Described volatile organic matter on-line monitoring system also includes that pretreatment system, data process display unit, gas source and help gas source.Sample gas import on described pretreatment system connects heat tracing pipe, connects the sample gas import of described monitoring main frame to sample outlet.The gas outlet of described gas source connects the fuel gas inlet on monitoring main frame, described in help and help gas outlet to connect to help fuel gas inlet on monitoring main frame on gas source.The built-in air compressor of described pretreatment system, can carry out internal blowback.Pipeline material in described pretreatment system is politef.The pipeline material of described monitoring main frame is rustless steel.Described gas chromatographic column is arranged in a post case, is provided with an aluminum heat block in described post case, and the coiling of described gas chromatographic column is fixed on described aluminum heat block.Described aluminum heat block is provided with at least 2 holes for placing heating rod and temperature sensor.Described aluminum heat block be provided around thermal insulation board.Offering two apertures on described thermal insulation board, the input of gas chromatographic column and outfan are each passed through described two aperture.Described post case is provided with a post case lid, and described post case lid is double-decker.The signal that described detector gathers, after signal amplifier amplifies, is exported data process display unit by holding wire and carries out computational analysis.
Compared with prior art, the device of on-line monitoring volatile organic matter described in the utility model, reach following effect:
1, this utility model is directly sampled by sampling probe, heat tracing pipe and air pump, carries out dedusting, dehumidifying and stream by pretreatment system and controls, it is achieved that sampling and the pretreatment to stationary source volatile organic matter.
2, it is sent to after sample gas is processed by this utility model by pretreatment system in gas chromatographic column, separated mutually by fixing in gas chromatographic column, sample after separation enters into detector, sample gas concentration is changed into signal of telecommunication output, the signal of telecommunication of output is exported data process display unit by output line after signal amplifier amplifies and carries out Treatment Analysis, it is achieved the continuous automatic on-line detection to the volatile organic matter of fixed-contamination source emission.
3, this utility model obtains one group of sampled data in the longest for benzene homologues 15 minutes, has higher temporal resolution, and it runs and maintenance cost is low, workable, is particularly suitable for the continuous automatic on-line detection of the volatile organic matter of stationary source discharge.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing being further appreciated by of the present utility model, constitutes a part of the present utility model, and schematic description and description of the present utility model is used for explaining this utility model, is not intended that improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the volatile organic matter on-line monitoring system structural representation of this utility model embodiment 1 and embodiment 2；
Fig. 2 is the workflow diagram of the pretreatment system of this utility model embodiment 1 and embodiment 2；
Fig. 3 is the monitoring host apparatus front view of this utility model embodiment 1 and embodiment 2；
Fig. 4 is the monitoring host apparatus side view of this utility model embodiment 2.
Detailed description of the invention
As employed some vocabulary in the middle of description and claim to censure specific components.Those skilled in the art are it is to be appreciated that hardware manufacturer may call same assembly with different nouns.In the way of this specification and claims not difference by title is used as distinguishing assembly, but it is used as the criterion distinguished with assembly difference functionally." comprising " as mentioned by the middle of description and claim in the whole text is an open language, therefore should be construed to " comprise but be not limited to "." substantially " referring in receivable range of error, those skilled in the art can solve described technical problem in the range of certain error, basically reaches described technique effect.Additionally, " coupling " word comprises any directly and indirectly electric property coupling means at this.Therefore, if a first device is coupled to one second device described in literary composition, then represents described first device and can directly be electrically coupled to described second device, or be indirectly electrically coupled to described second device by other devices or the means that couple.Description subsequent descriptions is for implementing better embodiment of the present utility model, and right described description is for the purpose of rule of the present utility model to be described, is not limited to scope of the present utility model.Protection domain of the present utility model is when being as the criterion depending on the defined person of claims.
Below in conjunction with accompanying drawing, this utility model is described in further detail, but not as to restriction of the present utility model.
Embodiment 1:
In conjunction with Fig. 1-Fig. 3, present embodiments provide the system of a kind of on-line monitoring volatile organic matter, including: sampling probe 1, pretreatment system 2, monitoring main frame 3, data process display unit 4, carrier gas source of the gas 5, gas source 6, help gas source 7, wherein, sampling probe 1 is used for gathering the sample gas in stationary source discharge pipe, pretreatment system 2 is used for sample gas is carried out dedusting, dehumidifying and flow-control, monitoring main frame 3 is used for separating sample gas and detecting, data process display unit 4 and are used for the signal of monitoring main frame 3 output is processed and calculated, carrier gas source of the gas 5 provides carrier gas for monitoring main frame, gas source 6 provides combustion gas for detector, gas source 7 is helped to provide combustion-supporting gas for detector.
Described sampling probe 1, is connected by heat tracing pipe with described pretreatment system 2, enters pretreatment system 2 after being used for gathering sample gas；
Described pretreatment system 2, is connected with described sampling probe 1 and monitoring main frame 3 respectively, enters monitoring main frame 3, control including dedusting, dehumidifying and stream after the sample gas gathered carries out pretreatment；
Described monitoring main frame 3, respectively with described pretreatment system 2, carrier gas source of the gas 5, gas source 6, help gas source 7 and data to process display unit 4 to be connected, for pretreated sample gas is carried out concentration analysis, sample gas is separated mutually by fixing in the gas chromatographic column in monitoring main frame 3, the detector that sample after separation enters in monitoring main frame 3 gathers signal, sends extremely described data through signal amplifier and process display unit 4 after gathering signal；
Described carrier gas source of the gas 5, is connected with described monitoring main frame 3, for providing carrier gas for monitoring main frame 3；
Described gas source 6, is connected with described monitoring main frame 3, for providing combustion gas for monitoring main frame 3；
Described help gas source 7, be connected with described monitoring main frame 3, for providing combustion-supporting gas for monitoring main frame 3；
Described data process display unit 4, are connected with described monitoring main frame 3, for receiving the signal that the detector in monitoring main frame 3 gathers, carry out computational analysis.
Described pretreatment system 2, including parallel sample gas pretreatment stream and gas pretreatment stream, wherein,
Described sample gas pretreatment stream, for sample gas is carried out pretreatment, including: dust filter unit 21, air compressor machine 213, condenser 22, peristaltic pump 214, sampling pump 23, flow channel switching valve 24, sample gas accurate filter 25, needle valve 26, by-pass gauge 211, flow stabilizing valve 27, sample introduction effusion meter 28 and atmospheric equilibrium valve 29, wherein, by-pass gauge 211, flow stabilizing valve 27, sample introduction effusion meter 28 and atmospheric equilibrium valve 29 share with gas pretreatment stream.
Described dust filter unit 21, is connected with described condenser 22, is also connected by back-flushing valve with described air compressor machine 213, for removing particulate matter bigger in sample gas；
Described air compressor machine 213, is connected by back-flushing valve with described dust filter unit 21, is used for providing purge gas, blowback from sampling probe 1 to the pipeline of pretreatment system 2；
Described condenser 22, is connected with described dust filter unit 21, peristaltic pump 214 and sampling pump 23 respectively, for sample gas is carried out dehumidification treatments；
Described peristaltic pump 214, is connected with described condenser 22, for getting rid of the cooling water in condenser 22；
Described sampling pump 23, is connected with described condenser 22 and described flow channel switching valve 24 respectively, is used for extracting sample gas；
Described flow channel switching valve 24, is connected with sampling pump 23, sample gas accurate filter 25, needle valve 26 respectively, for sample gas pretreatment stream and the switching of gas pretreatment stream；
Described sample gas accurate filter 25, is connected with described flow channel switching valve 24 and described flow stabilizing valve 27 respectively, for removing particulate matter tiny in sample gas；
Described needle valve 26, is connected with described flow channel switching valve 24 and by-pass gauge 211 respectively, for adjusting the sample gas flow being flowed into by-pass gauge 211；
Described by-pass gauge 211, is connected with the needle valve 26 in described needle valve 26 and gas gas circuit, for showing the flow of vent gas；
Described flow stabilizing valve 27, is connected with the accurate filter of described sample gas accurate filter 25 and gas pretreatment stream, for stably entering the gas flow of monitoring main frame 3；
Described sample introduction effusion meter 28, is connected with described flow stabilizing valve 27 and described atmospheric equilibrium valve 29 respectively, for showing access into the flow of monitoring main frame 3；
Described atmospheric equilibrium valve 29, is connected with the electric multi-way valve in described sample introduction effusion meter 28 and monitoring main frame, respectively for stably entering into the air pressure of the gas in electric multi-way valve；
Described gas pretreatment unit, for gas is carried out pretreatment, including: filter 215, flow channel switching valve 216, gas accurate filter 210, needle valve 217 and by-pass gauge 211, flow stabilizing valve 27, sample introduction effusion meter 28 and the atmospheric equilibrium valve 29 shared with sample gas pretreatment stream, wherein
Described filter 215, is connected with described flow channel switching valve 216, for removing the particulate matter in gas；
Described flow channel switching valve 216, is connected with described filter 215, gas accurate filter 210 and needle valve 217 respectively, the switching between gas pretreatment stream and sample gas pretreatment stream；
Described needle valve 217, is connected in parallel on by-pass gauge 211 with the needle valve 26 of sample gas pretreatment stream, for adjusting the gas flow being flowed into by-pass gauge 211.
Described monitoring main frame 3, including post case 42, electric multi-way valve, detector 44, carrier gas inlet, fuel gas inlet, helps fuel gas inlet, sample gas import, sample gas outlet and offgas outlet.
Described post case 42, inside sets gas chromatographic column 55, is connected with described electric multi-way valve and detector 44 respectively, for the various components in the admixture of gas needing monitoring being separated；
Described carrier gas inlet, is positioned on the backplate of monitoring main frame, is connected with described carrier gas source of the gas 5 and electric multi-way valve, for described gas chromatographic column 55 delivery of carrier gas；
Described fuel gas inlet, is positioned on the backplate of monitoring main frame, is connected with described gas source 6 and detector 44, for described detector 44 delivery of fuel gas；
Described help fuel gas inlet, be positioned on the backplate of monitoring main frame, help gas source 7 and detector 44 to be connected with described, be used for carrying combustion-supporting gas to described detector 44；
Described sample gas import, is positioned on the backplate of monitoring main frame, is connected with described pretreatment system 2 and electric multi-way valve, the sample gas after processing to described electric multi-way valve input pretreatment system 2；
Described sample gas exports, and is positioned on the backplate of monitoring main frame, is connected with described electric multi-way valve, for exporting the unnecessary sample gas not entering into gas chromatographic column 55；
Described offgas outlet, is positioned on monitoring main frame top cover, is in the surface of detector, for discharging the gas after detector 44 detects；
Described electric multi-way valve is connected by sample gas import with pretreatment system 2, is connected by carrier gas inlet with carrier gas source of the gas 5, is joined directly together with the gas chromatographic column 55 in described post case 42 and connects, for quantitatively entering the flow of the sample gas of gas chromatographic column 55；
Described detector 44, is connected with signal output 43 after signal amplifier, sends to signal output 43 after being used for gathering signal and being amplified by signal amplifier；
Described signal output 43, processes display unit 4 with described signal amplifier and data respectively and is connected；Described signal output 43, processes display unit 4 phase with described detector 44 and data respectively and couples.
Described post case 42, also includes: cylindrical aluminium heat block 57, and described gas chromatographic column 55 is coiled on described aluminum heat block 57, and described aluminum heat block 57 is for heating gas chromatographic column 55.
Described aluminum heat block 57, further, it is provided with at least 2 bottoming holes below, is used for placing heating rod 53 and temperature sensor 52, described heating rod 53 is for heating to aluminum heat block 57, and described temperature sensor 52 is for gathering the temperature signal of aluminum heat block 57.
Described aluminum heat block 57, further, is provided with thermal insulation board 54 about, and described thermal insulation board is for being incubated described aluminum heat block 57, and thermal insulation board 54 is provided with two apertures, and the input of gas chromatographic column 55 and outfan are each passed through said two aperture.
Described post case 42, further, is provided with a post case lid 56, and for double-decker, internal layer is heat-insulation layer, and outer layer is rustless steel outer housing.
Embodiment 2:
Refering to Fig. 1, for the overall structure schematic diagram of this utility model embodiment volatile organic matter on-line monitoring system, it includes that pretreatment system 2, monitoring main frame 3, data process display unit 4, gas source 6, help gas source 7.External sampling probe 1, heat tracing pipe and carrier gas source of the gas.Sample gas is taken out from discharge pipe by sampling probe 1, arrives pretreatment system 2 through heat tracing pipe, enters monitoring main frame 3 after dedusting, dehumidifying and flow-control.Monitoring main frame 3 output signal processes in data and carries out on display unit 4 processing display.
As in figure 2 it is shown, be the workflow diagram of pretreatment system.Under analysis state, opening sampling pump 23, sample gas is entered rack by the sampled probe of discharge pipe (filtering sample gas big dust particle particle, i.e. single filter at sampling probe) and heat traced pipeline.Sample gas enters condenser 22 after passing through dust filter unit 21 after entering rack, sample gas is sufficiently cool in condenser 22, aqueous water is got rid of by peristaltic pump 214, it is divided into two-way afterwards after sampling pump 23 and electromagnetic valve 24, lead up to and empty after needle valve 26, by-pass gauge 211, another road shows flow through sample introduction effusion meter 28 after stablizing flow velocity by flow stabilizing valve 27 after sample gas accurate filter 25, enters gas chromatograph by atmospheric equilibrium valve 29 afterwards and analyzes in real time.Under blowback state, first system stops sampling pump 23, closes sampling electromagnetic valve 24, is then turned on the inside and outside big flow blowback that blowback electromagnetic valve (flow channel switching valve 212) carries out popping one's head in.Timing signal, sample gas stream is closed, gas flow channel switching valve 216 is opened, gas is divided into two-way after filter 215 and flow channel switching valve 216, lead up to and empty after needle valve 217, by-pass gauge 211, another road shows flow through sample introduction effusion meter 28 after stablizing flow velocity by flow stabilizing valve 27 after gas accurate filter 210, enters gas chromatograph by atmospheric equilibrium valve 29 afterwards and is analyzed demarcating.
As it is shown on figure 3, for monitoring host apparatus front view.Sample gas enters in electric multi-way valve 41 by the sample gas import on monitoring main frame 3 rear board after pretreatment system 2, in the gas chromatographic column 55 being brought in post case 42 by carrier gas after the quantity tube on electric multi-way valve 41 is quantitative, after separating, entering in detector 44, the signal of telecommunication that detector 44 detects exports data process display unit by the signal output 43 on gas chromatograph 3 rear board after signal amplifier (in Fig. 4 51) amplifies and carries out computational analysis.
As shown in Figure 4, for monitoring host apparatus side view.Gas chromatographic column 55 is arranged in a post case 42, is provided with a cylindrical aluminium heat block 57 in described post case 42, and gas chromatographic column 55 coiling is fixed on aluminum heat block 57.Aluminum heat block 57 is arranged below 2 bottoming holes for placing heating rod 53 and temperature sensor 52.The lower section of aluminum heat block 57 is provided with thermal insulation board 54.Offering two apertures on thermal insulation board 54, the input of gas chromatographic column 55 and outfan are each passed through described two aperture.Post case 42 is provided with a post case lid 56, and described post case lid 56 is double-decker.
Embodiment 3:
On the basis of embodiment 1 and embodiment 2, the present embodiment is Application Example:
1) sampling, pretreatment system 2 starts sampling, and control electric multi-way valve 41, in sample states, is simultaneously emitted by sampled signal.In pretreatment system, air pump (sampling pump 23) extracts the tested sample gas at sampling probe 1.Sample gas arrives pretreatment system 2 through heat tracing pipe, and pretreatment system 2 carries out dedusting, dehumidifying etc. and processes sample gas.Filling monitoring main frame 3 buret decided at the higher level but not officially announced the most completely.After reaching the scheduled time, pretreatment system 2 enters sample introduction state.After start, data process the software of display unit 4 and do not start to gather data, are in stopping acquisition state, and when receiving sampled signal for the first time, data process display unit 4 and change the most accordingly.After starting to gather data, when receiving sampled signal, stop data collection, and process the sample gas data that sample introduction process collects.
2) sample introduction, pretreatment system 2 starts sample introduction, switches electric multi-way valve 41 to sample introduction state, is simultaneously emitted by sample introduction signal.Carrier gas enters chromatographic column flow detection device 44 with sample gas, and detector 44 output detections signal, amplified output processes display unit to data, and after reaching the scheduled time, pretreatment system 2 enters sample states.
3) Data Management Analysis, data process display unit 4, when receiving sample introduction signal, starts to gather data, and carries out showing on screen by the signal of telecommunication.
Under normal operation state, system carries out the switching of " sample states " and " sample introduction state " automatically.Data process before display unit 4 gathers data every time should carry out zero correction.
This utility model is sampled by sampling probe, arrives pretreatment system through heat tracing pipe and carries out the process such as dedusting, dehumidifying, enters monitoring main frame afterwards and be analyzed, and the benzene homologues for fixed-contamination source emission i.e. can get a group analysis result within 15 minutes.Kind and the concentration of emission thereof of volatile organic matter is i.e. can determine that by standard specimen.Use volatile organic matter on-line monitoring system of the present utility model, it is possible to realize the VOCs concentration of component to fixed-contamination source emission and the continuous online auto monitoring of methane/NMHC concentration.Its volume is little, simple in construction, runs and maintenance cost is low, workable, is particularly suitable for the automatic monitor for continuously of the volatile organic matter of fixed-contamination source emission.
Described above illustrate and describes some preferred embodiments of the present utility model, but as previously mentioned, it is to be understood that this utility model is not limited to form disclosed herein, it is not to be taken as the eliminating to other embodiments, and can be used for other combinations various, amendment and environment, and can be modified by above-mentioned teaching or the technology of association area or knowledge in the range of utility model structure described herein phase.And the change that those skilled in the art are carried out and change are without departing from spirit and scope of the present utility model, the most all should be in the protection domain of this utility model claims.
Claims (7)
1. a volatile organic matter on-line monitoring system, it is characterized in that, including: sampling probe, heat tracing pipe, pretreatment system, monitoring main frame, sample lines, gas-carrier pipeline, carrier gas source of the gas, gas source, help gas source and data to process display unit, wherein
Described sampling probe, is connected by heat tracing pipe with described pretreatment system, enters pretreatment system after being used for gathering sample gas；
Described pretreatment system, is connected with described sampling probe and monitoring main frame respectively, enters monitoring main frame, control including dedusting, dehumidifying and stream after the sample gas gathered carries out pretreatment；
Described monitoring main frame, respectively with described pretreatment system, carrier gas source of the gas, gas source, help gas source and data to process display unit to be connected, for pretreated sample gas is carried out concentration analysis, sample gas is separated mutually by fixing in the gas chromatographic column in monitoring main frame, the detector that sample after separation enters in monitoring main frame gathers signal, sends extremely described data through signal amplifier and process display unit after gathering signal；
Described carrier gas source of the gas, is connected with described monitoring main frame, for providing carrier gas for monitoring main frame；
Described gas source, is connected with described monitoring main frame, for providing combustion gas for monitoring main frame；
Described help gas source, be connected with described monitoring main frame, for providing combustion-supporting gas for monitoring main frame；Described data process display unit, are connected with described monitoring main frame, for receiving the signal that the detector in monitoring main frame gathers, carry out computational analysis.
Volatile organic matter on-line monitoring system the most according to claim 1, it is characterised in that described pretreatment system, including parallel sample gas pretreatment stream and gas pretreatment stream, wherein,
Described sample gas pretreatment stream, for sample gas is carried out pretreatment, including: dust filter unit, air compressor machine, condenser, peristaltic pump, sampling pump, flow channel switching valve, sample gas accurate filter, needle valve, by-pass gauge, flow stabilizing valve, sample introduction effusion meter and atmospheric equilibrium valve, wherein, by-pass gauge, flow stabilizing valve, sample introduction effusion meter and atmospheric equilibrium valve share with described gas pretreatment stream；
Described dust filter unit, is connected with described condenser, is also connected by back-flushing valve with described air compressor machine, is used for removing particulate matter in sample gas；
Described air compressor machine, is connected by back-flushing valve with described dust filter unit, is used for providing purge gas, blowback pipeline from sampling probe to pretreatment system；
Described condenser, is connected with described dust filter unit, peristaltic pump and sampling pump respectively, for sample gas is carried out dehumidification treatments；
Described peristaltic pump, is connected with described condenser, for getting rid of the cooling water in condenser；
Described sampling pump, is connected with described condenser and described flow channel switching valve respectively, is used for extracting sample gas；
Described flow channel switching valve, is connected with sampling pump, sample gas accurate filter, needle valve respectively, for sample gas pretreatment stream and the switching of gas pretreatment stream；
Described sample gas accurate filter, is connected with described flow channel switching valve and described flow stabilizing valve respectively, for removing particulate matter tiny in sample gas；
Described needle valve, is connected with described flow channel switching valve and by-pass gauge respectively, for adjusting the sample gas flow being flowed into by-pass gauge；
Described by-pass gauge, is connected with the needle valve in described needle valve and gas pretreatment stream, for showing the flow of vent gas；
Described flow stabilizing valve, is connected with the accurate filter of described sample gas accurate filter and gas pretreatment stream, for stably entering the gas flow of monitoring main frame；
Described sample introduction effusion meter, is connected with described flow stabilizing valve and described atmospheric equilibrium valve respectively, for showing access into the flow of monitoring main frame；
Described atmospheric equilibrium valve, is connected with the electric multi-way valve in described sample introduction effusion meter and monitoring main frame, respectively for stably entering into the air pressure of the gas in described electric multi-way valve；
Described gas pretreatment unit, for gas is carried out pretreatment, including: filter, flow channel switching valve, gas accurate filter, needle valve and by-pass gauge, flow stabilizing valve, sample introduction effusion meter and the atmospheric equilibrium valve shared with described sample gas pretreatment stream, wherein
Described filter, is connected with described flow channel switching valve, for removing the particulate matter in gas；
Described flow channel switching valve, is connected with described filter, described gas accurate filter and described needle valve respectively, the switching between gas pretreatment stream and sample gas pretreatment stream；
Described needle valve, is connected in parallel on by-pass gauge with the needle valve of sample gas pretreatment stream, for adjusting the gas flow being flowed into by-pass gauge.
Volatile organic matter on-line monitoring system the most according to claim 1, it is characterized in that, described monitoring main frame, including post case, electric multi-way valve, detector, signal output, carrier gas inlet, fuel gas inlet, help fuel gas inlet, sample gas import, sample gas outlet and offgas outlet, wherein
Described post case, inside sets gas chromatographic column, is connected with described electric multi-way valve and detector respectively, for the various components in the admixture of gas needing monitoring being separated；
Described carrier gas inlet, is positioned on the backplate of monitoring main frame, is connected with described carrier gas source of the gas and electric multi-way valve, for described gas chromatographic column delivery of carrier gas；
Described fuel gas inlet, is positioned on the backplate of monitoring main frame, is connected with described gas source and detector, for described detector delivery of fuel gas；
Described help fuel gas inlet, be positioned on the backplate of monitoring main frame, help gas source and detector to be connected with described, for the described detector combustion-supporting gas of conveying；
Described sample gas import, is positioned on the backplate of monitoring main frame, is connected with described pretreatment system and electric multi-way valve, the sample gas after processing to described electric multi-way valve input pretreatment system；
Described sample gas exports, and is positioned on the backplate of monitoring main frame, is connected with described electric multi-way valve, for exporting the unnecessary sample gas not entering into gas chromatographic column；
Described offgas outlet, is positioned on monitoring main frame top cover, is in the surface of detector, for discharging the gas after detector detects；
Described electric multi-way valve is connected by sample gas import with pretreatment system, is connected by carrier gas inlet with carrier gas source of the gas, is joined directly together with the gas chromatographic column in described post case and connects, for quantitatively entering the sample gas flow of gas chromatographic column；
Described detector, is connected with signal output after signal amplifier, sends to signal output after being used for gathering signal and being amplified by signal amplifier；
Described signal output, processes display unit with described signal amplifier and data respectively and is connected, and the signal for being amplified by signal amplifier sends to data process display unit.
Volatile organic matter on-line monitoring system the most according to claim 3, it is characterised in that described post case, also includes: aluminum heat block, and described gas chromatographic column is coiled on described aluminum heat block, and described aluminum heat block is for heating gas chromatographic column.
Volatile organic matter on-line monitoring system the most according to claim 4, it is characterized in that, described aluminum heat block, it is provided with at least 2 holes below, for placing heating rod and temperature sensor, described heating rod is for heating to aluminum heat block, and described temperature sensor is for gathering the temperature signal of aluminum heat block.
Volatile organic matter on-line monitoring system the most according to claim 4, it is characterized in that, described aluminum heat block, it is provided with thermal insulation board about, described thermal insulation board is for being incubated described aluminum heat block, thermal insulation board is provided with two apertures, and the input of gas chromatographic column and outfan are each passed through said two aperture.
Volatile organic matter on-line monitoring system the most according to claim 3, it is characterised in that described post case, is provided with a post case lid, and for double-decker, internal layer is heat-insulation layer, and outer layer is rustless steel outer housing.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105353056A (en) * | 2015-12-11 | 2016-02-24 | 北京万维盈创科技发展有限公司 | Volatile organic compound online monitoring system |
| CN106872719A (en) * | 2017-02-21 | 2017-06-20 | 上海宝英光电科技有限公司 | A kind of efficient volatile organic matter on-line monitoring system |
| CN107192768A (en) * | 2017-03-29 | 2017-09-22 | 江苏力维检测科技有限公司 | Gas chromatograph automatic sample handling system and auto injection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105353056A (en) * | 2015-12-11 | 2016-02-24 | 北京万维盈创科技发展有限公司 | Volatile organic compound online monitoring system |
| CN106872719A (en) * | 2017-02-21 | 2017-06-20 | 上海宝英光电科技有限公司 | A kind of efficient volatile organic matter on-line monitoring system |
| CN106872719B (en) * | 2017-02-21 | 2018-08-31 | 上海宝英光电科技有限公司 | A kind of efficient volatile organic matter on-line monitoring system |
| CN107192768A (en) * | 2017-03-29 | 2017-09-22 | 江苏力维检测科技有限公司 | Gas chromatograph automatic sample handling system and auto injection method |
| CN110441408A (en) * | 2018-05-04 | 2019-11-12 | 研能科技股份有限公司 | Gas chromatography equipment |
| CN110441408B (en) * | 2018-05-04 | 2022-07-01 | 研能科技股份有限公司 | Gas chromatography apparatus |
| CN109507373A (en) * | 2018-12-28 | 2019-03-22 | 北京卓越信通电子股份有限公司 | A kind of intelligent gas sensing detection method and the sensing and detecting system using this method |
| CN109507373B (en) * | 2018-12-28 | 2024-03-12 | 北京卓越信通电子股份有限公司 | Intelligent gas sensing detection method and sensing detection system applying same |
| CN112244192A (en) * | 2020-09-14 | 2021-01-22 | 江苏大学 | Low-moisture powder food sterilization device and sterilization method |
| CN112244192B (en) * | 2020-09-14 | 2022-09-16 | 江苏大学 | Low-moisture powder food sterilization device and sterilization method |
| CN114755349A (en) * | 2022-06-14 | 2022-07-15 | 四川晟实科技有限公司 | Automatic analysis system and method for low-temperature double-column chromatography of atmospheric volatile organic compounds |
| CN114755349B (en) * | 2022-06-14 | 2022-09-02 | 四川晟实科技有限公司 | Automatic analysis system and method for low-temperature double-column chromatography of atmospheric volatile organic compounds |
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