CN105954441A - System for on-line detection of dioxin type trace organic pollutants in actual smoke - Google Patents
System for on-line detection of dioxin type trace organic pollutants in actual smoke Download PDFInfo
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- CN105954441A CN105954441A CN201610406971.5A CN201610406971A CN105954441A CN 105954441 A CN105954441 A CN 105954441A CN 201610406971 A CN201610406971 A CN 201610406971A CN 105954441 A CN105954441 A CN 105954441A
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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
- G01N30/62—Detectors specially adapted therefor
- G01N30/72—Mass spectrometers
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Abstract
The invention relates to a trace organic pollutant detection technology and aims at providing a system for on-line detection of dioxin type trace organic pollutants in actual smoke. A sampling device of the system is connected with a thermal desorption instrument and a sampling pump module respectively through a pipeline, and a heat tracing pipeline is arranged on the pipeline. A laser device can simultaneously output two types light beams of deep ultraviolet wavelength and tunable ultraviolet visible waveband, an optical lens set is arranged between a flight time mass spectrometer and the laser device, two beams of laser are combined and then enter a laser window of the flight time mass spectrometer. A sample inlet pipeline of the flight time mass spectrometer is connected with a calibration gas storage bottle and the thermal desorption instrument respectively. The system integrates a thermal desorption technology and flight time mass-spectrometric technique, overcomes the shortcomings of a sample detection technology, can rapidly reflect the dioxin discharge concentration of smoke in time and is high in precision and large in information amount. The system composition can be adjusted according to actual demands, the adaptation can be improved. Detection results can represent the combustion conditions in a furnace, and the incineration process control can be optimized.
Description
Technical field
The present invention relates to the detection technique of dioxin organic micro-pollutant, particularly in real time, rapidly in flue gas
The concentration of dioxin trace organic substance carries out on-line checking.
Background technology
Dioxin belongs to trace level material, will accurately detect the concentration of dioxin in flue gas, have the highest technical difficulty.
Detection to dioxin mainly uses high-resolution gas chromatogram/high resolution mass spectrum combined instrument with off-line after spot sampling
(HRGC/HRMS) it is main for carrying out off-line analysis.Off-line analysis need to be measured through the sample pretreatment process of very complicated
Cycle typically requires at least 2 time-of-weeks, not only time-consuming serious, simultaneously can the chemical reagent of both expensive and cost of labor.
Therefore the detection work of dioxin can not be carried out widely, this also becomes the important system of current comprehensive limited control dioxin
About factor.
Dioxin online measuring technique overcomes the shortcoming of off-line analysis the most well, not only can reflect cigarette the most in time
The concentration of emission of dioxin in gas, and the result precision of gained is high, contain much information.On-line checking also has in sign stove
Combustion conditions instructs equipment optimization to run, auxiliary dioxin generates advantage and the effects such as process study.But, the most alive
Not yet there is the dioxin online measuring technique scheme of a set of maturation in the range of boundary, main reason is that the concentration of dioxin is extremely low,
In ppb (part per billion) level, the detection limit of general online analytical instrument is difficult to meet requirement.
It is the most crucial to the on-line measurement realizing dioxin that selection and dioxin have the indicant of certain dependency.Online survey
The concentration of amount indicant, converses the concentration of dioxin according to the incidence relation of indicant Yu dioxin, it is possible to achieve two dislike
The indirect measurement of English.Smoke components is extremely complex, has from high to low according to general concentration: CO, HCl, imperfect combustion
Product (PICs), chloro micromolecular compound, chlorinated aromatic compound, Polychlorinated biphenyls, dioxin etc..Indicant is only
Can be by substantial amounts of data, in analysis flue gas, the dependency between each component and dioxin determines.It has now been found that chlorine
Not only there is preferable indexical relation in the chloro-cyclic organic molecule such as benzene, chlorophenol, and concentration compares dioxin with dioxin,
Exceed two orders of magnitude, can reach PPM level, be proper indicant.
Thermal desorption technology (Thermal Desorption, TD) and ionization time of flight (Time of Flight Mass
Spectrometry, TOFMS) it is two kinds of advanced chemical analysis detection techniques, and it has been applied to field of environmental protection detection.
But at home and abroad there is no and both advanced technologies are combined and is applied to the organic dirt of dioxin trace in actual flue gas
The report of dye thing on-line checking.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes deficiency of the prior art, it is provided that dioxin in a kind of actual flue gas
Class organic micro-pollutant on-line detecting system.This system can have with dioxin trace in the actual flue gas of real-time online measuring
Organic pollutants concentration.
For solving above-mentioned technical problem, the solution of the present invention is:
There is provided dioxin organic micro-pollutant on-line detecting system in a kind of actual flue gas, including for gathering, processing
The flue gas pretreatment module of flue gas sample；This system also includes analyzing detection module and operation control module；
Described flue gas pretreatment module includes the sample devices connected respectively by pipeline with thermal desorption instrument and sampling pump module,
On described pipeline, heat traced pipeline is set；
Described analysis detection module includes time of-flight mass spectrometer, and can export deep ultraviolet wavelength and Generation of tunable UV simultaneously
The laser aid of two kinds of light beams of visible waveband；Optical lens group it is provided with between time of-flight mass spectrometer and laser aid, two
Shu Jiguang enters the laser window of time of-flight mass spectrometer after being closed bundle by it；The sample introduction pipeline of time of-flight mass spectrometer respectively with
Marked gas storage bottle and thermal desorption instrument connect；
Described operation control module includes industrial computer and human-computer interaction interface, and industrial computer is connected to flight time matter by holding wire
Spectrometer and thermal desorption instrument.
In the present invention, also include smoke filtration module, be the filter of band heating function；The entrance of filter sets with sampling
Standby outlet connects, and the outlet of filter connects with thermal desorption instrument and sampling pump module respectively.
In the present invention, also include homologue separation module, be the gas chromatograph that can carry out smoke components separating and deriving；
The entrance of gas chromatograph connects with the outlet of thermal desorption instrument, and the outlet of gas chromatograph is connected to the sample introduction of time of-flight mass spectrometer
Pipeline.
In the present invention, described sample devices is that constant speed heats sampling gun.
In the present invention, condensing unit that described sampling pump module includes being sequentially connected with by pipeline, flow valve, effusion meter and
Sampling pump, wherein condensing unit entrance connects with sample devices outlet, and the floss hole of sampling pump leads to air.
In the present invention, described flue gas pretreatment module also includes attemperating unit, for heat traced pipeline is carried out temperature control.
In the present invention, described laser aid is made up of Nd:YAG laser instrument, the 5th resonator cavity and OPO module, wherein,
OPO module is for exporting the laser of Generation of tunable UV visible waveband, and the 5th resonator cavity is for exporting the laser of deep ultraviolet wavelength.
In the present invention, described optical lens group includes ultraviolet beam splitting chip and at least one ultraviolet reflectance mirror.
Compared with prior art, the invention has the beneficial effects as follows:
1, thermal desorption technology is combined by the present invention first with ionization time of flight, and is applied to two evils in actual flue gas
The on-line checking of English class organic micro-pollutant.The shortcoming overcoming sample detecting technology well, not only can quickly and
Time ground reflection flue gas in the concentration of emission of dioxin, and the result precision of gained is high, contain much information.
2, present invention employs the mode of " stuck-module+optional module " flexibly, adjust system according to the actual requirements
Composition so that it is adaptability is greatly enhanced.
3, combustion conditions in testing result of the present invention can characterize stove, optimization of combustion process, incinerator is realized feedback control
System.
4, present disclosure applies equally to the detection of dioxin organic micro-pollutant in laboratory, provide for correlational study
Brand-new detection technique.
Accompanying drawing explanation
Fig. 1 is the structure flow chart of the present invention.
Reference in figure is: 1.Nd:YAG laser instrument: 2. the 5th resonator cavity；3.OPO module；The most dark purple external wave
Long output；5. UV, visible light wave band output (tunable)；6. optical lens group；7. laser window；8. the flight time
Mass spectrum ionized region；9. flight time mass spectrum movement area；10. flight time mass spectrum echo area；11.MCP detector；
12. Time-of flight analyzers；13. Pulsed Sampling valve and flanges；14. sample introduction pipelines；15. industrial computers；16. man-machine interactions
Interface；17. constant speed heating sampling guns；18. blowback passages；19. heat traced pipelines；20. (band heating function) filtration
Device；21. attemperating units；22.T type joint；23. thermal desorption instrument；24. gas chromatograpies；25. mass flows control
Device；26. marked gas storage bottles；27. condensing units；28. flow valves；29. effusion meters；30. sampling pumps.
Detailed description of the invention
The present invention is used for the system of dioxin organic micro-pollutant on-line checking in actual flue gas, mainly pre-by flue gas
Processing module, analysis detection module, operation control module composition.The core of flue gas pretreatment module is thermal desorption instrument, uses
In the material in sampling flue gas is carried out enrichment method so that test substance concentration improves, and then is greatly enhanced detection signal.
The core analyzing detection module is time of-flight mass spectrometer, can do the sample introduction material after enrichment method within the extremely short time
Go out response, provide the result of qualitative and quantitative analysis.The core of operation control module is industrial computer (computer), is used for setting
Determine the running parameter of thermal desorption instrument and time of-flight mass spectrometer, control and coordinate the workflow of two instruments, gather and show
Show the detection signal of flight time mass spectrum.
With detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings:
As it is shown in figure 1, the on-line detecting system of the present invention is by three indispensable modules (flue gas pretreatment module, analysis detection
Module, operation control module) and two apolegamy module (smoke filtration module, homologue separation module) compositions.
The concrete structure composition of system is described as follows:
Flue gas pretreatment module includes constant speed heating sampling gun 17, condensing unit 27, the flow being sequentially connected with by pipeline
Valve 28, effusion meter 29 and sampling pump 30, the floss hole of sampling pump 30 leads to air.Thermal desorption instrument 23 is by pipeline and T
One end of type joint 22 connects, and the another two ends of T connector 22 connect constant speed heating sampling gun 17, condensing unit 27 respectively.
Arranging heat traced pipeline 19 on described pipeline, attemperating unit 21 is for carrying out temperature control to heat traced pipeline 19.Constant speed heats
The thief hatch of sampling gun 17 can stretch out people and gather fume sample to chimney is internal, it is also possible to dioxin in laboratory
The sampling of class organic micro-pollutant.
Analyze detection module and include time of-flight mass spectrometer 12, and deep ultraviolet wavelength (such as 213nm) can be exported simultaneously
Laser aid with two kinds of light beams of Generation of tunable UV visible waveband.Laser aid is by Nd:YAG laser instrument the 1, the 5th resonance
Chamber 2 and OPO module 3 forms, and wherein, OPO module 3 is used for exporting the laser of Generation of tunable UV visible waveband, the
Five resonator cavitys 2 are for exporting the laser of deep ultraviolet wavelength.It is provided with light between time of-flight mass spectrometer 12 and laser aid
Learning battery of lens 6, optical lens group 6 includes ultraviolet beam splitting chip and two ultraviolet reflectance mirrors.Two bundle laser are by optical lens group
The laser window of time of-flight mass spectrometer 12 is entered after 6 conjunction bundles；The sample introduction pipeline of time of-flight mass spectrometer 12 has two-way defeated
Entering, a road connects with thermal desorption instrument 23, and mass flow controller 25 of separately leading up to connects with marked gas storage bottle 26.
Operation control module includes industrial computer 15 and human-computer interaction interface 16, when industrial computer 15 is connected to flight by holding wire
Between mass spectrograph 12 and thermal desorption instrument 23.
Smoke filtration module is optional module.Being the filter 20 of band heating function in the present embodiment, its entrance adds with constant speed
Thermal sampling rifle 17 outlet connects, and its outlet entrance with thermal desorption instrument 23 and condensing unit 27 the most respectively connects.
Homologue separation module is optional module.It the present embodiment is the gas phase color that can carry out smoke components separating and deriving
Spectrometer 24；The entrance of gas chromatograph 24 connects with thermal desorption instrument 23 outlet, and the outlet of gas chromatograph 24 is connected to fly
The sample introduction pipeline 14 of row time mass spectrum instrument 12.
The method of operation explanation of each module:
Smoke filtration module
Gas to be measured in incinerator back-end ductwork, entered through constant speed heating sampling gun 17 under the effect of sampling pump 30
Filter 20 carries out dust removal process.For 0.01 micron grain size, dust removal efficiency reaches 95%, to guarantee the particulate matter in flue gas
Do not interfere with testing result, analysis on damage instrument.Whole sample lines keeps high temperature under the effect of heat traced pipeline 19,
Avoiding some gas to be measured to condense, whole pipeline temperature control can reach 200 DEG C, temperature-controlled precision ± 2 DEG C.
Flue gas pretreatment module
After dust removal process, sample gas enters into thermal desorption instrument 23.Specific adsorbing medium is loaded in the middle of thermal desorption instrument 23,
The dioxin indicant molecule of the overwhelming majority in adsorption sampling gas at low temperatures；After absorption completes, thermal desorption instrument 23
It is rapidly heated so that the indicant molecule in adsorbing medium promptly departs from very short time, along with a small amount of carrier gas is quick
Flow out thermal desorption instrument 23 and enter subsequent analysis step.Through the process of such a absorption/desorption, script content in flue gas
Extremely low indicant molecule is concentrated, and concentration can promote 2 to 3 orders of magnitude, and then is greatly enhanced detection signal,
Improve the detection limit of whole system.Thermal desorption instrument 23 in the present invention loads two groups of parallel adsorbing mediums, when wherein
One group when being in adsorbed state, another group is then in detachment status, thus improves the efficiency of sampling and detection.In the present invention
Thermal desorption instrument can use the TT24-7 type product that MARKES company produces.
Homologue separation module
Gas molecule to be measured after concentration, is brought in gas chromatograph 24 by carrier gas.Originally the indicant molecule mixed
Through the centrifugation of chromatographic column, the most in succession flow out gas chromatograph 24 with carrier gas.This order is by chromatographic column
The temperature-rising method of type and gas chromatograph 24 determine, i.e. by choose suitable chromatographic column can be real with heating schedule
Now specific elution order.After each separated process of homologue molecule of material of the same race, can divide during subsequent detection
Do not realize quantitative analysis.
Analyze detection module
Gas molecule to be measured after separation, enters into flight time matter along sample introduction pipeline 14 through Pulsed Sampling valve and flange 13
In the middle of spectrometer 12.Tracing for generating UV tunable laser 5 is combined into a branch of with deep ultraviolet wavelength laser 4 via optical lens group 6, and
It is directed to flight time mass spectrum ionized region 8 via laser window 7.Gas molecule to be measured first absorbs specific UV wave band
Photon, reaches resonant excited state；The photon of re-absorption deep ultraviolet wavelength, complete (1+1 ') multiphoton ionization process.This
Process provides ion source for follow-up flying time mass spectrum analysis.
Through each ion that laser ionization produces, owing to its charge-mass ratio q/m is different, enter into the initial speed in field-free flight district 9
Degree v is different, so it is different to arrive detector total flight time, the ion of so different charge-mass ratios is achieved that separation.
All of ion is finally knocked MCP detector 11 and produces the voltage signal of correspondence.Gas concentration to be measured is the highest, ionization
The quantity of the ion produced is the most, and the voltage signal that shock MCP (Microchanel Plate) produces is the strongest.According to ion
Total flight time and produce voltage signal intensity, it is achieved to the qualitative of gas to be measured and quantitative analysis.
Operation control module
Industrial computer 15 receives the detection signal of MCP detector 11, man-machine after special operation control software processes
On interactive interface 16, the form with mass spectrum shows.Component and the concentration letter of gas to be measured can be obtained by mass spectrum
Breath.The manipulation instruction that user makes on human-computer interaction interface 16, sends to each parts of detecting system via industrial computer 15,
Thus realize a whole set of detecting system operation and control.
It is only the specific embodiment of the present invention finally it should be noted that listed above.It is clear that the invention is not restricted to
Above example, it is also possible to have many variations.Those of ordinary skill in the art can from present disclosure directly
The all deformation derived or associate, are all considered as protection scope of the present invention.
Claims (8)
1. a dioxin organic micro-pollutant on-line detecting system in actual flue gas, including for gathering, processing
The flue gas pretreatment module of flue gas sample；It is characterized in that, this system also includes analyzing detection module and operation control module；
Described flue gas pretreatment module includes the sample devices connected respectively by pipeline with thermal desorption instrument and sampling pump module,
On described pipeline, heat traced pipeline is set；
Described analysis detection module includes time of-flight mass spectrometer, and can export deep ultraviolet wavelength and Generation of tunable UV simultaneously
The laser aid of two kinds of light beams of visible waveband；Optical lens group it is provided with between time of-flight mass spectrometer and laser aid, two
Shu Jiguang enters the laser window of time of-flight mass spectrometer after being closed bundle by it；The sample introduction pipeline of time of-flight mass spectrometer respectively with
Marked gas storage bottle and thermal desorption instrument connect；
Described operation control module includes industrial computer and human-computer interaction interface, and industrial computer is connected to flight time matter by holding wire
Spectrometer and thermal desorption instrument.
System the most according to claim 1, it is characterised in that also include smoke filtration module, is that band adds hot merit
The filter of energy；The outlet of the entrance of filter and sample devices connects, the outlet of filter respectively with thermal desorption instrument and sampling
Pump module connects.
System the most according to claim 1, it is characterised in that also include homologue separation module, is can be by cigarette
In gas, composition carries out the gas chromatograph separating, deriving；The entrance of gas chromatograph connects with the outlet of thermal desorption instrument, gas phase
Chromatographic outlet is connected to the sample introduction pipeline of time of-flight mass spectrometer.
4. according to the system described in claims 1 to 3 any one, it is characterised in that described sample devices is
Speed heating sampling gun.
5. according to the system described in claims 1 to 3 any one, it is characterised in that described sampling pump module bag
Include condensing unit, flow valve, effusion meter and the sampling pump being sequentially connected with by pipeline, wherein condensing unit entrance and sampling
Equipment outlet connects, and the floss hole of sampling pump leads to air.
6. according to the system described in claims 1 to 3 any one, it is characterised in that described flue gas pretreatment mould
Block also includes attemperating unit, for heat traced pipeline is carried out temperature control.
7. according to the system described in claims 1 to 3 any one, it is characterised in that described laser aid by
Nd:YAG laser instrument, the 5th resonator cavity and OPO module composition, wherein, OPO module is used for exporting Generation of tunable UV
The laser of visible waveband, the 5th resonator cavity is for exporting the laser of deep ultraviolet wavelength.
8. according to the system described in claims 1 to 3 any one, it is characterised in that described optical lens group bag
Include ultraviolet beam splitting chip and at least one ultraviolet reflectance mirror.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610406971.5A CN105954441B (en) | 2016-06-08 | 2016-06-08 | Dioxin organic micro-pollutant on-line detecting system in a kind of practical flue gas |
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|---|---|---|---|
| CN201610406971.5A CN105954441B (en) | 2016-06-08 | 2016-06-08 | Dioxin organic micro-pollutant on-line detecting system in a kind of practical flue gas |
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| CN105954441B CN105954441B (en) | 2019-03-29 |
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Cited By (11)
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| CN106770962A (en) * | 2016-12-29 | 2017-05-31 | 浙江富春江环保科技研究有限公司 | It is a kind of for dioxin on-line checking except flue gas reclaimed water, the device of sour gas |
| CN106770858A (en) * | 2016-12-28 | 2017-05-31 | 浙江富春江环保科技研究有限公司 | A kind of gas sample introduction regulating system for dioxin on-line checking |
| CN107037171A (en) * | 2016-12-29 | 2017-08-11 | 浙江富春江环保科技研究有限公司 | Transmission line system between a kind of gaschromatographic mass spectrometry for dioxin on-line checking |
| CN107677720A (en) * | 2017-10-10 | 2018-02-09 | 浙江富春江环保科技研究有限公司 | A kind of dioxin on-line detecting system rack |
| CN108828152A (en) * | 2018-06-23 | 2018-11-16 | 江翠珍 | Stationary source atmosphere pollution on-line automatic monitoring system |
| CN111882230A (en) * | 2020-07-31 | 2020-11-03 | 浙江大学 | Neural network-based dioxin emission online monitoring method |
| CN113804838A (en) * | 2021-09-28 | 2021-12-17 | 浙江富春江环保科技研究有限公司 | Boundary alarm method for dioxin online detection |
| CN113804517A (en) * | 2021-09-28 | 2021-12-17 | 浙江富春江环保科技研究有限公司 | Dioxin on-line measuring system based on boundary warning |
| CN113964015A (en) * | 2021-10-27 | 2022-01-21 | 广西电网有限责任公司电力科学研究院 | Device for external standard quantification of time-of-flight mass spectrum |
| CN115825310A (en) * | 2022-12-08 | 2023-03-21 | 浙江富春江环保科技研究有限公司 | Method for detecting dioxin in waste incineration flue gas based on single substance or multiple indicators |
| CN115840010A (en) * | 2022-12-08 | 2023-03-24 | 浙江富春江环保科技研究有限公司 | Garbage incineration flue gas dioxin detection system based on single substance or multiple indicators |
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Cited By (16)
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| CN106770858A (en) * | 2016-12-28 | 2017-05-31 | 浙江富春江环保科技研究有限公司 | A kind of gas sample introduction regulating system for dioxin on-line checking |
| CN106770858B (en) * | 2016-12-28 | 2019-08-27 | 浙江富春江环保科技研究有限公司 | A kind of standard gas sample introduction regulating system for dioxin on-line checking |
| CN107037171A (en) * | 2016-12-29 | 2017-08-11 | 浙江富春江环保科技研究有限公司 | Transmission line system between a kind of gaschromatographic mass spectrometry for dioxin on-line checking |
| CN106770962A (en) * | 2016-12-29 | 2017-05-31 | 浙江富春江环保科技研究有限公司 | It is a kind of for dioxin on-line checking except flue gas reclaimed water, the device of sour gas |
| CN107677720B (en) * | 2017-10-10 | 2023-10-24 | 浙江富春江环保科技研究有限公司 | Dioxin on-line measuring system rack |
| CN107677720A (en) * | 2017-10-10 | 2018-02-09 | 浙江富春江环保科技研究有限公司 | A kind of dioxin on-line detecting system rack |
| CN108828152A (en) * | 2018-06-23 | 2018-11-16 | 江翠珍 | Stationary source atmosphere pollution on-line automatic monitoring system |
| CN111882230A (en) * | 2020-07-31 | 2020-11-03 | 浙江大学 | Neural network-based dioxin emission online monitoring method |
| CN111882230B (en) * | 2020-07-31 | 2021-10-01 | 浙江大学 | Neural network-based dioxin emission online monitoring method |
| CN113804838A (en) * | 2021-09-28 | 2021-12-17 | 浙江富春江环保科技研究有限公司 | Boundary alarm method for dioxin online detection |
| CN113804517B (en) * | 2021-09-28 | 2022-05-03 | 浙江富春江环保科技研究有限公司 | Dioxin on-line measuring system based on boundary warning |
| CN113804838B (en) * | 2021-09-28 | 2022-07-26 | 浙江富春江环保科技研究有限公司 | Boundary alarm method for dioxin online detection |
| CN113804517A (en) * | 2021-09-28 | 2021-12-17 | 浙江富春江环保科技研究有限公司 | Dioxin on-line measuring system based on boundary warning |
| CN113964015A (en) * | 2021-10-27 | 2022-01-21 | 广西电网有限责任公司电力科学研究院 | Device for external standard quantification of time-of-flight mass spectrum |
| CN115825310A (en) * | 2022-12-08 | 2023-03-21 | 浙江富春江环保科技研究有限公司 | Method for detecting dioxin in waste incineration flue gas based on single substance or multiple indicators |
| CN115840010A (en) * | 2022-12-08 | 2023-03-24 | 浙江富春江环保科技研究有限公司 | Garbage incineration flue gas dioxin detection system based on single substance or multiple indicators |
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