CN105353056B - Volatile organic matter on-line monitoring system - Google Patents
Volatile organic matter on-line monitoring system Download PDFInfo
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- CN105353056B CN105353056B CN201510921103.6A CN201510921103A CN105353056B CN 105353056 B CN105353056 B CN 105353056B CN 201510921103 A CN201510921103 A CN 201510921103A CN 105353056 B CN105353056 B CN 105353056B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/88—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86
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Abstract
This application discloses a kind of volatile organic matter on-line monitoring system, including：Sampling probe, heat tracing pipe, pretreatment system, monitoring main frame, sample lines, gas-carrier pipeline, carrier gas source of the gas, gas source, gas source and data processing display unit are helped, wherein, sampling probe is connected with pretreatment system by heat tracing pipe；Pretreatment system is connected with sampling probe and monitoring main frame respectively；Monitoring main frame respectively with pretreatment system, carrier gas source of the gas, gas source, help gas source and data processing display unit to be connected；Carrier gas source of the gas is connected with monitoring main frame；Gas source is connected with monitoring main frame；Gas source is helped to be connected with monitoring main frame；Data processing display unit is connected with monitoring main frame.The present invention obtains one group of sampled data in most long 15 minutes for benzene homologues, has higher temporal resolution, and its operation is low with maintenance cost, workable, is particularly suitable for fixing the continuous automatic on-line detection of the volatile organic matter of source emission.
Description
Technical field
The present invention relates to gas monitoring techniques field, is to be related to one kind can continuously monitor volatility on-line specifically
The system of organic concentration.
Background technology
According to the definition of the World Health Organization, volatile organic matter (volatile organic compounds, VOCs)
Refer to boiling point 50-250 DEG C, at room temperature saturated vapour pressure more than 133.32Pa, be present in air in vapour form at normal temperatures
In a type organic.VOCs has wider polarity and concentration range, have under certain concentration to human body carcinogenic, teratogenesis,
Mutagenesis and the danger for triggering leukaemia.VOCs is the decisive precursor of photochemical fog, and PM2.5 main producers
Thing.Reliable VOCS measurement data is to study its basis to environment and Human health effects.Because the VOCs monitored is by source
The influence of the factor such as change, chemical reaction process and sampling time and duration.So only pass through long-continued prison
The feature and general trend of VOCs concentration levels change can just be disclosed by surveying, and scientific basis is provided for environmental Kuznets Curves.
The current most widely used VOCs method of samplings are stainless cylinder of steel sampling, adsorbent samples, airbag samples and low
Warm condensation method sampling.The sample of collection have to pass through the methods of SPE, the solvent analysis, low temperature pre-concentration Thermal desorption carry out with
Processing.Sample analysis relies primarily on gas chromatography, high performance liquid chromatography, gas chromatography-mass spectrum, fluorescence spectrophotometry
Deng.In the prior art, the monitoring to VOCs still has problems with：
1) there is the defects of certain in the current various method of samplings during sampling, such as：Airbag sampling due to
Inwall, which exists, adsorbs and parses effect, does not use now；Stainless steel sample can needs progress adsorbent after sending laboratory back to dense
Contracting or the processing of low temperature pre-concentration, although when can avoid the adsorbent from sampling penetrate with artificial pollution, repeatedly divided
Analysis, it is costly, it is necessary to which complicated equipment is cleaned.Although adsorbent sampling and low temperature samples can be completed pair while sampling
The pre-concentration of sample, but need low-temperature transport, storage.
2) have to just be used for analyzing by the pretreatment of sample using above-mentioned sample collection method, due to pre- place
Artificial pollution, whole process cycle can be caused to sample unavoidably in the process complexity of reason and the manual intervention in pretreatment
It is long, and certain error can be brought.
3) for the detection of volatile organic matter, method the most frequently used at present is gas chromatography and gas chromatography-mass spectrum
Method, but off-line analysis technology is used mostly, temporal resolution is low, can not react the concentration of various material compositions in VOCs at any time
Between fine change, while Sampling analysis process is higher to the technical requirements of personnel.
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, it is not only expensive, and analyze the temporal resolution that process is numerous and diverse, samples and analyzes
It is very poor, still there is larger gap with being actually needed.
It is development high sensitivity, easy to operate, economical suitable so study the VOCs of new generation method of sampling and analytical technology
With and VOCs analyzers easy to maintain, develop VOCs on-line continuous Automatic Measurement Techniques, in volatile organic matter study on monitoring
Field has great importance.
The content of the invention
In order to solve the above technical problems, the invention provides a kind of volatile organic matter on-line monitoring system, its feature exists
In, including：Sampling probe, heat tracing pipe, pretreatment system, monitoring main frame, sample lines, gas-carrier pipeline, carrier gas source of the gas, combustion gas gas
Source, gas source and data processing display unit are helped, wherein,
The sampling probe, it is connected with the pretreatment system by heat tracing pipe, for entering pre- place after gathering sample gas
Reason system；
The pretreatment system, it is connected respectively with the sampling probe and monitoring main frame, for entering to the sample gas of collection
Enter monitoring main frame, including dedusting, dehumidifying and stream control after row pretreatment；
The monitoring main frame, respectively with the pretreatment system, carrier gas source of the gas, gas source, help gas source and data
Processing display unit is connected, and for carrying out concentration analysis to pretreated sample gas, sample gas is by monitoring the gas phase in main frame
Stationary phase in chromatographic column is separated, the detector collection signal that the sample after separation is entered in monitoring main frame, collection letter
Sent after number through signal amplifier to the data processing display unit；
The carrier gas source of the gas, it is connected with the monitoring main frame, for providing carrier gas for monitoring main frame；
The gas source, it is connected with the monitoring main frame, for providing combustion gas for monitoring main frame；
It is described to help gas source, it is connected with the monitoring main frame, for providing combustion-supporting gas for monitoring main frame；The data
Display unit is handled, is connected with the monitoring main frame, for receiving the signal of the detector collection monitored in main frame, is counted
Point counting is analysed.
Preferably, the pretreatment system, including parallel sample gas pretreatment stream and gas pretreatment stream, wherein,
The sample gas pre-processes stream, for being pre-processed to sample gas, including：Dust filter unit, air compressor machine, condensation
Device, peristaltic pump, sampling pump, flow channel switching valve, sample gas accurate filter, needle valve, by-pass gauge, flow stabilizing valve, sample introduction flow
Meter and atmospheric equilibrium valve, wherein, by-pass gauge, flow stabilizing valve, sample introduction flowmeter and atmospheric equilibrium valve pre-process with the gas
Stream shares；
The dust filter unit, it is connected with the condenser, is also connected with the air compressor machine by back-flushing valve, be used for
Remove particulate matter larger in sample gas；
The air compressor machine, it is connected with the dust filter unit by back-flushing valve, for providing purge gas, blowback is from adopting
Pipeline of the sample probe to pretreatment system；
The condenser, it is connected respectively with the dust filter unit, peristaltic pump and sampling pump, for being removed to sample gas
Wet process；
The peristaltic pump, it is connected with the condenser, for excluding the cooling water in condenser；
The sampling pump, it is connected respectively with the condenser and the flow channel switching valve, for extracting sample gas；
The flow channel switching valve, it is connected respectively with sampling pump, sample gas accurate filter, needle valve, locates in advance for sample gas
Manage the switching of stream and gas pretreatment stream；
The sample gas accurate filter, is connected with the flow channel switching valve and the flow stabilizing valve, for removing sample respectively
Tiny particulate matter in gas；
The needle valve, it is connected respectively with the flow channel switching valve and by-pass gauge, bypass is flowed into for adjusting
The sample throughput of flowmeter；
The by-pass gauge, it is connected with the needle valve in the needle valve and gas pretreatment stream, for showing
The flow of vent gas；
The flow stabilizing valve, it is connected with the accurate filter of the sample gas accurate filter and gas pretreatment stream, uses
In the stable gas flow for entering monitoring main frame；
The sample introduction flowmeter, it is connected respectively with the flow stabilizing valve and the atmospheric equilibrium valve, for showing access into
Monitor the flow of main frame；
The atmospheric equilibrium valve, it is connected respectively with the electric multi-way valve in the sample introduction flowmeter and monitoring main frame, uses
In the air pressure of the stable gas entered in the electric multi-way valve；
The gas pretreatment unit, for being pre-processed to gas, including：Filter, flow channel switching valve, gas essence
Close filter, needle valve and the by-pass gauge shared with sample gas pretreatment stream, flow stabilizing valve, sample introduction flowmeter and
Atmospheric equilibrium valve, wherein,
The filter, it is connected with the flow channel switching valve, for removing the particulate matter in gas；
The flow channel switching valve, it is connected respectively with the filter, the gas accurate filter and the needle valve,
The switching between stream and sample gas pretreatment stream is pre-processed for gas；
The needle valve, it is connected in parallel on by-pass gauge with the needle valve of sample gas pretreatment stream, is flowed for adjusting
Enter the gas flow to by-pass gauge.
Preferably, the monitoring main frame, including post case, electric multi-way valve, detector, signal output, carrier gas inlet, combustion
Gas import, fuel gas inlet, the import of sample gas, the outlet of sample gas and offgas outlet are helped, wherein,
The post case, gas chromatographic column is inside set, be connected respectively with the electric multi-way valve and detector, for that will need
Various components in the admixture of gas of monitoring are separated；
The carrier gas inlet, on the backplate of monitoring main frame, it is connected with the carrier gas source of the gas and electric multi-way valve, uses
In to the gas chromatographic column delivery of carrier gas；
The fuel gas inlet, positioned at monitoring main frame backplate on, be connected with the gas source and detector, for
The detector delivery of fuel gas；
It is described to help fuel gas inlet, on the backplate of monitoring main frame, help gas source and detector to be connected with described, use
In conveying combustion-supporting gas to the detector；
The sample gas import, on the backplate of monitoring main frame, it is connected with the pretreatment system and electric multi-way valve,
For the sample gas after being handled to electric multi-way valve input pretreatment system；
The sample gas outlet, on the backplate of monitoring main frame, is connected with the electric multi-way valve, unnecessary for exporting
The sample gas for not entering into gas chromatographic column；
The offgas outlet, on monitoring main frame top cover, the surface in detector, pass through detector for discharging
Gas after detection；
The electric multi-way valve is connected with pretreatment system by sample gas import, passes through carrier gas inlet phase with carrier gas source of the gas
Connection, is joined directly together with the gas chromatographic column in the post case and connects, for quantitatively entering the sample throughput of gas chromatographic column；
The detector, is connected after signal amplifier with signal output, for gathering signal and being put by signal
Sent after big device amplification to signal output；
The signal output, it is connected respectively with the signal amplifier and data processing display unit, for that will believe
The signal of number amplifier amplification is sent to data processing display unit.
Preferably, the post case, in addition to：Aluminium heat block, the gas chromatographic column are coiled on the aluminium heat block, institute
Aluminium heat block is stated to be used to heat gas chromatographic column.
Preferably, the aluminium heat block, further, below provided with least two hole, for placing heating rod and temperature
Sensor, the heating rod are used to be heated to aluminium heat block, and the temperature sensor is used for the temperature for gathering aluminium heat block
Signal.
Preferably, the aluminium heat block, further, around it is provided with thermal insulation board, and the thermal insulation board is used for described
Aluminium heat block is incubated, and thermal insulation board is provided with two apertures, and the input and output end of gas chromatographic column are each passed through described
Two apertures.
Preferably, the post case, it is double-decker provided with a post case lid further, internal layer is heat-insulation layer, outer layer
It is stainless steel outer cover.
The volatile organic matter on-line monitoring system that the present invention is taken, it has monitoring main frame, the monitoring main frame bag
Include post case, electric multi-way valve, detector, carrier gas inlet, fuel gas inlet, help fuel gas inlet, the import of sample gas, sample gas outlet and tail gas
Outlet.Wherein, the post case, gas chromatographic column is inside set, be connected respectively with the electric multi-way valve and detector.It is described electronic
Multiple-way valve is connected with pretreatment system by sample gas import, is connected with carrier gas source of the gas by carrier gas inlet, with the post case
In chromatographic column be joined directly together and connect.The detector, is connected after signal amplifier with signal output.The signal output
Mouthful, it is connected respectively with the signal amplifier and data processing display unit.
The volatile organic matter on-line monitoring system also includes pretreatment system, data processing display unit, combustion gas gas
Source and help gas source.Sample gas import connection heat tracing pipe on the pretreatment system, the monitoring main frame is connected to sample outlet
Sample gas import.Fuel gas inlet on the gas outlet connection monitoring main frame of the gas source, it is described to help on gas source
Help on gas outlet connection monitoring main frame and help fuel gas inlet.An air compressor built in the pretreatment system, it can carry out
Internal blowback.Pipeline material in the pretreatment system is polytetrafluoroethylene (PTFE).The pipeline material of the monitoring main frame is stainless
Steel.The gas chromatographic column is arranged in a post case, and an aluminium heat block, the gas chromatographic column coiling are provided with the post case
It is fixed on the aluminium heat block.The aluminium heat block is provided with least two hole and is used for placing heating rod and temperature sensor.Institute
State and be provided with thermal insulation board around aluminium heat block.Offer two apertures on the thermal insulation board, the input of gas chromatographic column and
Output end is each passed through two described apertures.The post case is provided with a post case lid, and the post case lid is double-decker.The inspection
The signal of device collection is surveyed after signal amplifier amplifies, data processing display unit is output to by signal wire and carries out calculating analysis.
Compared with prior art, the device of on-line monitoring volatile organic matter of the present invention, has reached following effect：
1st, the present invention is directly sampled by sampling probe, heat tracing pipe and air pump, and dedusting, dehumidifying are carried out by pretreatment system
Controlled with stream, realize the sampling and pretreatment to stationary source volatile organic matter.
2nd, the present invention is sent in gas chromatographic column after being handled by pretreatment system sample gas, passes through gas-chromatography
Stationary phase in post is separated, and the sample after separation enters detector, and sample gas concentration is changed into electric signal output, output
Electric signal after signal amplifier amplifies by output line be output to data processing display unit carry out Treatment Analysis, realize
The continuous automatic on-line of the volatile organic matter of fixed-contamination source emission is detected.
3rd, the present invention obtains one group of sampled data in most long 15 minutes for benzene homologues, has higher temporal resolution, its
Operation is low with maintenance cost, workable, is particularly suitable for fixing the continuous automatic on-line inspection of the volatile organic matter of source emission
Survey.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the present invention, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the volatile organic matter on-line monitoring system structural representation of Example 1 and Example 2 of the present invention；
Fig. 2 is the workflow diagram of the pretreatment system of Example 1 and Example 2 of the present invention；
Fig. 3 is the monitoring host apparatus front view of Example 1 and Example 2 of the present invention；
Fig. 4 is the monitoring host apparatus side view of the embodiment of the present invention 2.
Embodiment
Some vocabulary has such as been used to censure specific components among specification and claim.Those skilled in the art should
It is understood that hardware manufacturer may call same component with different nouns.This specification and claims are not with name
The difference of title is used as the mode for distinguishing component, but is used as the criterion of differentiation with the difference of component functionally.Such as logical
The "comprising" of piece specification and claim mentioned in is an open language, therefore should be construed to " include but do not limit
In "." substantially " refer in receivable error range, those skilled in the art can be described within a certain error range solution
Technical problem, basically reach the technique effect.In addition, " coupling " one word is herein comprising any direct and indirect electric property coupling
Means.Therefore, if the first device of described in the text one is coupled to a second device, representing the first device can directly electrical coupling
The second device is connected to, or the second device is electrically coupled to indirectly by other devices or coupling means.Specification
Subsequent descriptions for implement the present invention better embodiment, so it is described description be by illustrate the present invention rule for the purpose of,
It is not limited to the scope of the present invention.Protection scope of the present invention is worked as to be defined depending on appended claims institute defender.
The present invention is described in further detail below in conjunction with accompanying drawing, but it is not as a limitation of the invention.
Embodiment 1：
With reference to Fig. 1-Fig. 3, a kind of system for monitoring volatile organic matter on-line is present embodiments provided, including：Sampling is visited
First 1, pretreatment system 2, monitoring main frame 3, data processing 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, and pretreatment system 2 is used for removing sample gas
Dirt, dehumidifying and flow control, monitoring main frame 3 are used for that sample gas is separated and detected, and data processing display unit 4 is used for prison
Survey the signal that main frame 3 exports to be handled and calculated, carrier gas source of the gas 5 provides carrier gas for monitoring main frame, and gas source 6 is detector
Combustion gas is provided, helps gas source 7 to provide combustion-supporting gas for detector.
The sampling probe 1, it is connected with the pretreatment system 2 by heat tracing pipe, for entering in advance after gathering sample gas
Processing system 2；
The pretreatment system 2, it is connected respectively with the sampling probe 1 and monitoring main frame 3, for the sample gas to collection
Enter monitoring main frame 3, including dedusting, dehumidifying and stream control after being pre-processed；
It is described monitoring main frame 3, respectively with the pretreatment system 2, carrier gas source of the gas 5, gas source 6, help gas source 7 and
Data processing display unit 4 is connected, and for carrying out concentration analysis to pretreated sample gas, sample gas is by monitoring in main frame 3
Gas chromatographic column in stationary phase separated, the sample after separation enter monitoring main frame 3 in detector collection signal,
Sent after collection signal through signal amplifier to the data processing display unit 4；
The carrier gas source of the gas 5, it is connected with the monitoring main frame 3, for providing carrier gas for monitoring main frame 3；
The gas source 6, it is connected with the monitoring main frame 3, for providing combustion gas for monitoring main frame 3；
It is described to help gas source 7, it is connected with the monitoring main frame 3, for providing combustion-supporting gas for monitoring main frame 3；
The data processing display unit 4, it is connected with the monitoring main frame 3, for receiving the detection monitored in main frame 3
The signal of device collection, carries out calculating analysis.
The pretreatment system 2, including parallel sample gas pretreatment stream and gas pretreatment stream, wherein,
The sample gas pre-processes stream, for being pre-processed to sample gas, 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
211st, flow stabilizing valve 27, sample introduction flowmeter 28 and atmospheric equilibrium valve 29, wherein, by-pass gauge 211, flow stabilizing valve 27, sample introduction flow
Meter 28 and atmospheric equilibrium valve 29 share with gas pretreatment stream.
The dust filter unit 21, it is connected with the condenser 22, is also connected with the air compressor machine 213 by back-flushing valve
Connect, for removing particulate matter larger in sample gas；
The air compressor machine 213, it is connected with the dust filter unit 21 by back-flushing valve, for providing purge gas, instead
Blow the pipeline from sampling probe 1 to pretreatment system 2；
The condenser 22, be connected respectively with the dust filter unit 21, peristaltic pump 214 and sampling pump 23, for pair
Sample gas carries out dehumidification treatments；
The peristaltic pump 214, it is connected with the condenser 22, for excluding the cooling water in condenser 22；
The sampling pump 23, it is connected respectively with the condenser 22 and the flow channel switching valve 24, for extracting sample gas；
The flow channel switching valve 24, it is connected respectively with sampling pump 23, sample gas accurate filter 25, needle valve 26, is used for
Sample gas pre-processes the switching of stream and gas pretreatment stream；
The sample gas accurate filter 25, is connected with the flow channel switching valve 24 and the flow stabilizing valve 27, is used for respectively
Remove particulate matter tiny in sample gas；
The needle valve 26, it is connected respectively with the flow channel switching valve 24 and by-pass gauge 211, is flowed into for adjusting
To the sample throughput of by-pass gauge 211；
The by-pass gauge 211, it is connected with the needle valve 26 in the needle valve 26 and gas gas circuit, for showing
The flow of vent gas；
The flow stabilizing valve 27, it is connected with the accurate filter of the sample gas accurate filter 25 and gas pretreatment stream
Connect, for the stable gas flow for entering monitoring main frame 3；
The sample introduction flowmeter 28, it is connected respectively with the flow stabilizing valve 27 and the atmospheric equilibrium valve 29, for showing
Enter the flow of monitoring main frame 3；
The atmospheric equilibrium valve 29, it is connected respectively with the electric multi-way valve in the sample introduction flowmeter 28 and monitoring main frame
Connect, the air pressure for the stable gas entered in electric multi-way valve；
The gas pretreatment unit, for being pre-processed to gas, including：Filter 215, flow channel switching valve 216,
Gas accurate filter 210, needle valve 217 and the by-pass gauge 211 shared with sample gas pretreatment stream, flow stabilizing valve 27, enter
Sample flowmeter 28 and atmospheric equilibrium valve 29, wherein,
The filter 215, it is connected with the flow channel switching valve 216, for removing the particulate matter in gas；
The flow channel switching valve 216, respectively with the filter 215, gas accurate filter 210 and the phase of needle valve 217
Connection, the switching between stream and sample gas pretreatment stream is pre-processed for gas；
The needle valve 217, it is connected in parallel on by-pass gauge 211, uses with the needle valve 26 of sample gas pretreatment stream
The gas flow of by-pass gauge 211 is flowed into adjustment.
The monitoring main frame 3, including post case 42, electric multi-way valve, detector 44, carrier gas inlet, fuel gas inlet, combustion-supporting gas
Import, the import of sample gas, the outlet of sample gas and offgas outlet.
The post case 42, inside sets gas chromatographic column 55, is connected respectively with the electric multi-way valve and detector 44, is used for
Various components in the admixture of gas that will need to monitor are separated；
The carrier gas inlet, on the backplate of monitoring main frame, it is connected with the carrier gas source of the gas 5 and electric multi-way valve,
For to the delivery of carrier gas of gas chromatographic column 55；
The fuel gas inlet, on the backplate of monitoring main frame, it is connected with the gas source 6 and detector 44, uses
In to the delivery of fuel gas of detector 44；
It is described to help fuel gas inlet, on the backplate of monitoring main frame, gas source 7 and the phase of detector 44 are helped with described
Even, for conveying combustion-supporting gas to the detector 44；
The sample gas import, on the backplate of monitoring main frame, with the pretreatment system 2 and electric multi-way valve phase
Even, for the sample gas after being handled to electric multi-way valve input pretreatment system 2；
The sample gas outlet, on the backplate of monitoring main frame, is connected with the electric multi-way valve, unnecessary for exporting
The sample gas for not entering into gas chromatographic column 55；
The offgas outlet, on monitoring main frame top cover, the surface in detector, pass through detector for discharging
Gas after 44 detections；
The electric multi-way valve is connected with pretreatment system 2 by sample gas import, passes through carrier gas inlet with carrier gas source of the gas 5
It is connected, is joined directly together and connects with the gas chromatographic column 55 in the post case 42, for quantitatively enters the sample gas of gas chromatographic column 55
Flow；
The detector 44, is connected after signal amplifier with signal output 43, for gathering signal and passing through letter
Sent after the amplification of number amplifier to signal output 43；
The signal output 43, is connected with the signal amplifier and data processing display unit 4 respectively；The letter
Number delivery outlet 43, coupled respectively with the detector 44 and the phase of data processing display unit 4.
The post case 42, in addition to：Cylindrical aluminium heat block 57, the gas chromatographic column 55 are coiled in the aluminium heat block
On 57, the aluminium heat block 57 is used to heat gas chromatographic column 55.
The aluminium heat block 57, further, below provided with least two bottoming hole, for placing heating rod 53 and temperature
Sensor 52 is spent, the heating rod 53 is used to be heated to aluminium heat block 57, and the temperature sensor 52 adds for gathering aluminium
The temperature signal of hot block 57.
The aluminium heat block 57, further, around it is provided with thermal insulation board 54, and the thermal insulation board is used to add the aluminium
Hot block 57 is incubated, and thermal insulation board 54 is provided with two apertures, and the input and output end of gas chromatographic column 55 are each passed through institute
State two apertures.
The post case 42, it is double-decker provided with a post case lid 56, internal layer is heat-insulation layer, and outer layer is not further
Become rusty steel outer cover.
Embodiment 2：
Refering to Fig. 1, for the overall structure diagram of volatile organic matter on-line monitoring system of the embodiment of the present invention, it includes
Pretreatment system 2, monitoring main frame 3, data processing 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 by sampling probe 1 from discharge pipe, and pretreatment system 2, warp are reached by heat tracing pipe
Cross dedusting, dehumidifying and flow control and enter monitoring main frame 3 afterwards.The output signal of main frame 3 is monitored on data processing display unit 4
Processing is carried out to show.
As shown in Fig. 2 the workflow diagram for pretreatment system.Under analysis state, sampling pump 23 is opened, sample gas is by arranging
Put the sampled probe (sample gas big dust particle particle, i.e. by-pass filtration are filtered out at sampling probe) of pipeline and heat traced pipeline enters
Rack.Sample gas enters after rack by entering condenser 22 after dust filter unit 21, and sample gas is sufficiently cool in condenser 22, leads to
Cross peristaltic pump 214 exclude aqueous water, be divided into two-way after sampling pump 23 and magnetic valve 24 afterwards, all the way by needle valve 26,
Emptied after by-pass gauge 211, another way after sample gas accurate filter 25 by after the stable flow velocity of flow stabilizing valve 27 through sample introduction
Flowmeter 28 shows flow, is analyzed in real time into gas chromatograph by atmospheric equilibrium valve 29 afterwards.Under blowback state, it is
System stops sampling pump 23, closes sampling magnetic valve 24 first, is then turned on blowback magnetic valve (flow channel switching valve 212) and is popped one's head in
Inside and outside big flow blowback.During demarcation, sample air-flow road is closed, and gas flow channel switching valve 216 is opened, and gas passes through the He of filter 215
It is divided into two-way after flow channel switching valve 216, all the way by being emptied after needle valve 217, by-pass gauge 211, another way passes through gas
By showing flow through sample introduction flowmeter 28 after the stable flow velocity of flow stabilizing valve 27 after accurate filter 210, pass through atmospheric equilibrium afterwards
Valve 29 carries out analysis demarcation into gas chromatograph.
As shown in figure 3, it is monitoring host apparatus front view.Sample gas by after pretreatment system 2 through monitor the rear board of main frame 3
On sample gas import enter in electric multi-way valve 41, post is brought into by carrier gas after the quantity tube on electric multi-way valve 41 is quantitative
In gas chromatographic column 55 in case 42, after being separated, enter in detector 44, the electric signal that detector 44 detects is through letter
Data processing is output to by the signal output 43 on the rear board of gas chromatograph 3 after the amplification of number amplifier (51 in Fig. 4)
Display unit carries out calculating analysis.
As shown in figure 4, it is monitoring host apparatus side view.Gas chromatographic column 55 is arranged in a post case 42, the post
A cylindrical aluminium heat block 57 is provided with case 42, the coiling of gas chromatographic column 55 is fixed on aluminium heat block 57.Aluminium heat block 57
2 bottoming holes are arranged below to be used for placing heating rod 53 and temperature sensor 52.The lower section of aluminium heat block 57 is provided with thermal insulation board
54.Offer two apertures on thermal insulation board 54, the input and output end of gas chromatographic column 55 are each passed through described two small
Hole.Post case 42 is provided with a post case lid 56, and the 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) sample, pretreatment system 2 starts to sample, and control electric multi-way valve 41 is simultaneously emitted by sampling letter in sample states
Number.Air pump (sampling pump 23) extracts the detected sample gas at sampling probe 1 in pretreatment system.Sample gas reaches pre- place by heat tracing pipe
Reason system 2, pretreatment system 2 carry out the processing such as dedusting, dehumidifying to sample gas.Then filling monitors 3 default buret of main frame completely.Reach
Pretreatment system 2 enters sample introduction state after to the scheduled time.After start, the software of data processing display unit 4 does not start to adopt
Collect data, in acquisition state is stopped, when receiving sampled signal for the first time, data processing display unit 4 does not change accordingly.
After gathered data is started, when receiving sampled signal, stop data collection, and handle the sample destiny that sample introduction process collects
According to.
2) sample introduction, pretreatment system 2 start sample introduction, switching electric multi-way valve 41 to sample introduction state, are simultaneously emitted by sample introduction letter
Number.Carrier gas enters chromatographic column flow detection device 44 with sample gas, and detector 44 exports detection signal, amplified to export to data
Display unit is handled, pretreatment system 2 enters sample states after reaching the scheduled time.
3) Data Management Analysis, data processing display unit 4 start gathered data when receiving sample introduction signal, and by electricity
Signal be shown on screen.
Under normal operation state, system carries out the switching of " sample states " and " sample introduction state " automatically.Data processing is shown
Zero correction should be carried out before 4 each gathered data of unit.
The present invention is sampled by sampling probe, and reaching pretreatment system by heat tracing pipe carries out dedusting, dehumidifying etc.
Reason, analyzed afterwards into monitoring main frame, one was can obtain within 15 minutes for the benzene homologues of fixed-contamination source emission
Group analysis result.It is the species and its concentration of emission that can determine that volatile organic matter by standard specimen.Using the volatility of the present invention
Organic matter on-line monitoring system, it can realize dense to the VOCs concentration of component and methane/NMHC of fixed-contamination source emission
The continuous online auto monitoring of degree.Its small volume, simple in construction, operation is low with maintenance cost, workable, is particularly suitable for solid
Determine the automatic monitor for continuously of the volatile organic matter of discharge of pollutant sources.
Some preferred embodiments of the present invention have shown and described in described above, but as previously described, it should be understood that the present invention
Be not limited to form disclosed herein, be not to be taken as the exclusion to other embodiment, and available for various other combinations,
Modification and environment, and above-mentioned teaching or the technology or knowledge of association area can be passed through in the range of invention structure phase described herein
It is modified., then all should be in this hair and the change and change that those skilled in the art are carried out do not depart from the spirit and scope of the present invention
In the protection domain of bright appended claims.
Claims (6)
- A kind of 1. volatile organic matter on-line monitoring system, it is characterised in that including：Sampling probe, heat tracing pipe, pretreatment system System, monitoring main frame, sample lines, gas-carrier pipeline, carrier gas source of the gas, gas source, gas source and data processing display unit are helped, Wherein,The sampling probe, it is connected with the pretreatment system by heat tracing pipe, for entering pretreatment system after gathering sample gas System；The pretreatment system, it is connected respectively with the sampling probe and monitoring main frame, it is pre- for being carried out to the sample gas of collection Enter monitoring main frame, including dedusting, dehumidifying and stream control after processing；The monitoring main frame, respectively with the pretreatment system, carrier gas source of the gas, gas source, help gas source and data processing Display unit is connected, and for carrying out concentration analysis to pretreated sample gas, sample gas is by monitoring the gas-chromatography in main frame Stationary phase in post is separated, the detector collection signal that the sample after separation is entered in monitoring main frame, after gathering signal Sent through signal amplifier to the data processing display unit；The carrier gas source of the gas, it is connected with the monitoring main frame, for providing carrier gas for monitoring main frame；The gas source, it is connected with the monitoring main frame, for providing combustion gas for monitoring main frame；It is described to help gas source, it is connected with the monitoring main frame, for providing combustion-supporting gas for monitoring main frame；The data processing display unit, it is connected with the monitoring main frame, for receiving the detector collection monitored in main frame Signal, carry out calculating analysis；The pretreatment system, including parallel sample gas pretreatment stream and gas pretreatment stream, Wherein,The sample gas pre-processes stream, for being pre-processed to sample gas, including：It is dust filter unit, air compressor machine, condenser, compacted Dynamic pump, sampling pump, flow channel switching valve, sample gas accurate filter, needle valve, by-pass gauge, flow stabilizing valve, sample introduction flowmeter and big Gas balanced valve, wherein, by-pass gauge, flow stabilizing valve, sample introduction flowmeter and atmospheric equilibrium valve are total to gas pretreatment stream With；The dust filter unit, it is connected with the condenser, is also connected with the air compressor machine by back-flushing valve, for removing Larger particulate matter in sample gas；The air compressor machine, it is connected with the dust filter unit by back-flushing valve, for providing purge gas, blowback is visited from sampling Head arrives the pipeline of pretreatment system；The condenser, it is connected respectively with the dust filter unit, peristaltic pump and sampling pump, for being carried out to sample gas at dehumidifying Reason；The peristaltic pump, it is connected with the condenser, for excluding the cooling water in condenser；The sampling pump, it is connected respectively with the condenser and the flow channel switching valve, for extracting sample gas；The flow channel switching valve, it is connected respectively with sampling pump, sample gas accurate filter, needle valve, for sample gas pretreated stream Road and the switching of gas pretreatment stream；The sample gas accurate filter, is connected with the flow channel switching valve and the flow stabilizing valve respectively, for removing in sample gas Tiny particulate matter；The needle valve, it is connected respectively with the flow channel switching valve and by-pass gauge, bypass flow is flowed into for adjusting The sample throughput of meter；The by-pass gauge, it is connected with the needle valve in the needle valve and gas pretreatment stream, is emptied for showing The flow of gas；The flow stabilizing valve, it is connected with the accurate filter of the sample gas accurate filter and gas pretreatment stream, for steady The fixed gas flow for entering monitoring main frame；The sample introduction flowmeter, it is connected respectively with the flow stabilizing valve and the atmospheric equilibrium valve, for showing access into monitoring The flow of main frame；The atmospheric equilibrium valve, it is connected respectively with the electric multi-way valve in the sample introduction flowmeter and monitoring main frame, for steady Surely the air pressure of the gas entered in the electric multi-way valve；The gas pretreatment unit, for being pre-processed to gas, including：Filter, flow channel switching valve, gas precision mistake Filter, needle valve and by-pass gauge, flow stabilizing valve, sample introduction flowmeter and the air shared with sample gas pretreatment stream Balanced valve, wherein,The filter, it is connected with the flow channel switching valve, for removing the particulate matter in gas；The flow channel switching valve, it is connected respectively with the filter, the gas accurate filter and the needle valve, is used for Gas pre-processes the switching between stream and sample gas pretreatment stream；The needle valve, it is connected in parallel on by-pass gauge with the needle valve of sample gas pretreatment stream, is flowed into for adjusting The gas flow of by-pass gauge.
- 2. volatile organic matter on-line monitoring system according to claim 1, it is characterised in that the monitoring main frame, bag Include post case, electric multi-way valve, detector, signal output, carrier gas inlet, fuel gas inlet, help fuel gas inlet, the import of sample gas, sample Gas exports and offgas outlet, wherein,The post case, gas chromatographic column is inside set, be connected respectively with the electric multi-way valve and detector, for will need to monitor Admixture of gas in various components separated；The carrier gas inlet, positioned at monitoring main frame backplate on, be connected with the carrier gas source of the gas and electric multi-way valve, for The gas chromatographic column delivery of carrier gas；The fuel gas inlet, on the backplate of monitoring main frame, it is connected with the gas source and detector, for described Detector delivery of fuel gas；It is described to help fuel gas inlet, positioned at monitoring main frame backplate on, help gas source and detector to be connected with described, for The detector conveys combustion-supporting gas；The sample gas import, on the backplate of monitoring main frame, it is connected with the pretreatment system and electric multi-way valve, is used for Sample gas to after electric multi-way valve input pretreatment system processing；Sample gas outlet, on the backplate of monitoring main frame, is connected with the electric multi-way valve, unnecessary does not have for exporting There is the sample gas for entering gas chromatographic column；The offgas outlet, on monitoring main frame top cover, the surface in detector, detected for discharging by detector Gas afterwards；The electric multi-way valve is connected with pretreatment system by sample gas import, is connected with carrier gas source of the gas by carrier gas inlet Connect, be joined directly together and connect with the gas chromatographic column in the post case, for quantitatively entering the sample throughput of gas chromatographic column；The detector, is connected after signal amplifier with signal output, for gathering signal and passing through signal amplifier Sent after amplification to signal output；The signal output, it is connected respectively with the signal amplifier and data processing display unit, for signal to be put The signal of big device amplification is sent to data processing display unit.
- 3. volatile organic matter on-line monitoring system according to claim 2, it is characterised in that the post case, in addition to： Aluminium heat block, the gas chromatographic column are coiled on the aluminium heat block, and the aluminium heat block is used to carry out gas chromatographic column Heating.
- 4. volatile organic matter on-line monitoring system according to claim 3, it is characterised in that the aluminium heat block, enter One step, below provided with least two hole, for placing heating rod and temperature sensor, the heating rod is used to heat to aluminium Block is heated, and the temperature sensor is used for the temperature signal for gathering aluminium heat block.
- 5. volatile organic matter on-line monitoring system according to claim 3, it is characterised in that the aluminium heat block, enter One step, thermal insulation board is provided with around it, the thermal insulation board is used to be incubated the aluminium heat block, and thermal insulation board is provided with two Individual aperture, the input and output end of gas chromatographic column are each passed through described two apertures.
- 6. volatile organic matter on-line monitoring system according to claim 2, it is characterised in that the post case, further Ground, it is double-decker provided with a post case lid, internal layer is heat-insulation layer, and outer layer is stainless steel outer cover.
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| CN105929032A (en) * | 2016-02-26 | 2016-09-07 | 常州磐诺仪器有限公司 | On-line monitoring system for non-methane total hydrocarbons |
| CN105717245A (en) * | 2016-03-18 | 2016-06-29 | 广东伟创科技开发有限公司 | Volatile organic compound monitoring method and system |
| CN107782819A (en) * | 2016-08-30 | 2018-03-09 | 无锡创晨科技有限公司 | A kind of continuous on-line monitoring system of volatile organic matter and its monitoring method |
| CN106404957A (en) * | 2016-10-18 | 2017-02-15 | 天津七二通信广播股份有限公司 | Volatile organic pollutant control contrast column box and using method |
| CN106596782B (en) * | 2016-12-22 | 2019-09-10 | 汇众翔环保科技河北有限公司 | A kind of volatile organic matter on-line monitoring system and analysis method |
| CN106769269A (en) * | 2017-01-23 | 2017-05-31 | 宇星科技发展(深圳)有限公司 | A kind of sampling of VOCs on-line monitorings and pretreatment system |
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| CN107748214A (en) * | 2017-11-20 | 2018-03-02 | 华电智控（北京）技术有限公司 | The pretreatment of volatile organic matter and analysis system |
| CN109991187A (en) * | 2018-01-03 | 2019-07-09 | 佛山市南华仪器股份有限公司 | Volatile organic matter concentration detection apparatus and detection method |
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| CN112540119A (en) * | 2020-12-01 | 2021-03-23 | 华通力盛(北京)智能检测集团有限公司 | TVOCs organized online monitoring system and working method thereof |
| CN114354517B (en) * | 2021-12-16 | 2022-11-04 | 杭州春来科技有限公司 | Device and method for monitoring total organic carbon content in gas on line |
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