CN104833689B - In-line analyzer based on total mercury in dry method enriched flue gas - Google Patents
In-line analyzer based on total mercury in dry method enriched flue gas Download PDFInfo
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- CN104833689B CN104833689B CN201510257728.7A CN201510257728A CN104833689B CN 104833689 B CN104833689 B CN 104833689B CN 201510257728 A CN201510257728 A CN 201510257728A CN 104833689 B CN104833689 B CN 104833689B
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 86
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000003546 flue gas Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 46
- 239000012528 membrane Substances 0.000 claims abstract description 65
- 230000005540 biological transmission Effects 0.000 claims abstract description 38
- 239000000843 powder Substances 0.000 claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 239000002594 sorbent Substances 0.000 claims abstract description 27
- 239000002250 absorbent Substances 0.000 claims abstract description 25
- 230000002745 absorbent Effects 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 21
- 238000004876 x-ray fluorescence Methods 0.000 claims abstract description 18
- 238000009659 non-destructive testing Methods 0.000 claims abstract description 5
- 238000005070 sampling Methods 0.000 claims description 21
- 239000003463 adsorbent Substances 0.000 claims description 17
- 230000003139 buffering effect Effects 0.000 claims description 15
- 239000003153 chemical reaction reagent Substances 0.000 claims description 15
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 12
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 12
- 241000009298 Trigla lyra Species 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 229920002521 macromolecule Polymers 0.000 claims description 3
- 239000002808 molecular sieve Substances 0.000 claims description 3
- 239000013618 particulate matter Substances 0.000 claims description 3
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000741 silica gel Substances 0.000 claims description 2
- 229910002027 silica gel Inorganic materials 0.000 claims description 2
- 239000003517 fume Substances 0.000 claims 2
- 235000019504 cigarettes Nutrition 0.000 claims 1
- 238000005086 pumping Methods 0.000 claims 1
- 238000004458 analytical method Methods 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 abstract description 13
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 239000012080 ambient air Substances 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000003570 air Substances 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- 239000003245 coal Substances 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 238000004445 quantitative analysis Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000013524 data verification Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000037213 diet Effects 0.000 description 1
- 235000005911 diet Nutrition 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/223—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material by irradiating the sample with X-rays or gamma-rays and by measuring X-ray fluorescence
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/405—Concentrating samples by adsorption or absorption
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0045—Hg
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/30—Controlling by gas-analysis apparatus
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The in-line analyzer and analysis method of total mercury in a kind of enriched flue gas based on dry method, belong to environmental monitoring technology field, including absorbent filling system, example enrichment system, detecting system, filter membrane transmission system and control acquisition system；Absorbent filling system realizes filling of the powder sorbent in filter membrane surface, example enrichment system is enriched with the total mercury in sample gas, detecting system carries out online Non-Destructive Testing to the sample of collection, filter membrane transmission system is the transmission between each subsystem by filter membrane, and control acquisition system realizes above-mentioned each system coordination operating and collection, processing and the storage of various data.Analysis method includes the following steps：Absorbent filling → example enrichment → sample detection.Advantage is, by the introducing of efficient powder sorbent, with reference to filter membrane beneficiation technologies, the full enrichment of gaseous mercury and particulate Hg in flue gas or ambient air can be realized at the same time, again by online x-ray fluorescence technology for detection, the on-line analysis of total mercury in flue gas or ambient air is finally realized.
Description
Technical field
The invention belongs to environmental monitoring technology field, and in particular to online point of total mercury in a kind of enriched flue gas based on dry method
Analyzer and analysis method.
Background technology
Mercury and mercuric compounds can enter environment by multiple channel, its discharge is broadly divided into natural source (volcanic eruption etc.)
And artificial source, wherein artificial source is most important mercury pollution source, and fuel combustion is mostly important one side in human activity.
Some researches show that the discharge capacity of whole world fire coal mercury accounts for 65% of total release or so, is averaged mercury content according to Chinese coal
0.188mg/kg is calculated, and the factor of air mercury emissions reaches as high as more than 70% in China's fire coal industry, and wherein coal-burning power plant
Mercury emissions account for more than the 30% of Mercury In The Air total emission volumn, occupy industry first place.Mercury and mercuric compounds have very strong bio-toxicity,
Human body can be entered by modes such as breathing, skin contact, diet, into organism after be difficult be discharged, human body is caused seriously
Harm.Therefore on-line monitoring is carried out for the total mercury in flue gas to be of great significance.
The gas mercury in-line analyzer of mainstream is primarily directed to the survey of gaseous mercury (including element mercury and ionic mercury) at present
It is fixed, it can not also be measured for particulate Hg, therefore can not realize the detection of total mercury.Mainly pass through golden mercury for the measure of gaseous mercury
Neat enrichment method, this method cost is higher, and is required to high-purity carrier gas purge after being enriched with, easy to use cold original below
Sub- fluorescence or Clod Vapour Atomic Absorption technology is detected, and either Cold Atomic Fluorescent Mercury or Clod Vapour Atomic Absorption technology, is all
Directly against elemental mercury (Hg0) detection, in order to complete the measure of different valence state mercury, often also need to carry out mercury valence state turn
Change (Hg2+→Hg0), the method generally used for thermocatalytic conversion method and pyrolytic conversion method, wherein, thermocatalytic conversion method be
Under the conditions of 200~400 DEG C, ion state mercury is converted into by elemental mercury by catalytic reaction, as a result of catalytic reaction so that
Conversion temperature is low compared to pyrolytic conversion temperature, and catalytic treatment is relatively easy, it is not necessary to chemical reagent, but be catalyzed in order to prevent
Agent poisoning needs to configure spare conversion system, brings the rising of instrument cost, while there is also life problems for catalyst；High temperature
Conversion method be high temperature (>800 DEG C) under the conditions of, ionic mercury can be reduced into elemental mercury, and this method is tried without using chemistry
Agent and catalyst, method for transformation is reliable at high temperature, but to the more demanding of instrument and pipeline, while there is safety in high temperature
Hidden danger, and bring the rising of overall instrument energy consumption.In addition, above-mentioned on-line analysis belongs to destructive detection, Wu Fawei
The data verification of subsequent experimental room preserves sample.
The content of the invention
Present invention aims at the in-line analyzer and analysis method for providing total mercury in a kind of enriched flue gas based on dry method, adopt
With online x-ray fluorescence non-destructive testing technology, the total mercury (including gaseous mercury and particulate Hg) that can be directed to flue gas emission carries out
Line analysis, sensitivity, stability and reappearance are good.
The in-line analyzer based on total mercury in dry method enriched flue gas of the present invention, using online x-ray fluorescence analysis technology,
The analyzer includes absorbent filling system, example enrichment system, detecting system, filter membrane transmission system and control collection system
System, wherein, absorbent filling system realizes filling of the powder sorbent in filter membrane surface, can be uniformly firm by powder sorbent
The adsorption layer for being filled in filter membrane surface, forming for gaseous mercury；Adsorbent can use macromolecule, activated carbon, molecular sieve, silica gel
Deng adsorption of modification material, powder size can be from nanoscale to mm-scale.Example enrichment system is to the total mercury (bag in sample gas
Include gaseous mercury and particulate Hg) it is enriched with, by the introducing of adsorbent, with reference to filter membrane, gaseous mercury in flue gas can be completed at the same time
With the enrichment of particulate Hg, the full enrichment of total mercury in flue gas is realized；Detecting system carries out online Non-Destructive Testing, filter to the sample of collection
Film transmission system is the transmission between each subsystem by filter membrane, control acquisition system realize above-mentioned each system coordination operating with
And collection, processing and the storage of various data.
The absorbent filling system includes：Place reagent bottle 1, air compressor 2, the first solenoid valve of powder sorbent
3rd, injection apparatus 4, second solenoid valve 5, buffering hybrid bottle 6, the 3rd solenoid valve 7, load pipe lifting motor 8, load sample stage 9,
Flue gas processing device 10, load pump 11.PTFE tube is inserted with reagent bottle 1, ensures that the lower port of pipe is filled by powder sorbent.
There is the connection of PTFE hoses between reagent bottle 1, the first solenoid valve 3, injection apparatus 4.Air compressor 2, injection apparatus 4, second
Connected between solenoid valve 5, buffering hybrid bottle 6, the 3rd solenoid valve 7 using PTFE tube.Pipe lifting motor 8 is loaded by clamping
It is controlled to move up and down outside PTFE tube.Load and connected between sample stage 9, flue gas processing device 10 and filling pump 11 by tracheae
Connect.The system mainly realizes that powder sorbent is loaded in the uniform of filter membrane surface.
The example enrichment transmission system includes：4th solenoid valve 12, sampling pipe lifting motor 13, sample platform 14,
Flue gas processing device 10, flow controller 15, aspiration pump 16.PTFE pipes are all connected with before and after 4th solenoid valve 12.Sampling pipe lifts
Motor 13 controls it to move up and down by clamping outside PTFE tube.Sample platform 14, flue gas processing device 10, flow controller
15th, connected between aspiration pump 16 by tracheae.By the filter membrane after absorbent filling system, sampling sample can be run to by adjusting
The top of sample platform 14, enrichment system can realize the enrichment to total mercury by continuous acquisition sample gas；
The detecting system includes：X-ray light pipe 17, light pipe high voltage power supply 18 and x-ray fluorescence detector 19, detection sample
Sample platform 20.X-ray light pipe 17 is connected with light pipe high voltage power supply 18 by high-tension bus-bar.X-ray fluorescence detector 19 passes through data
Line is connected with industrial PC 30.
The filter membrane transmission system includes：Feed belt wheel 21, take-up pulley 22, smooth wheel 23-26, pinch roller 27, transmission shaft 28.
Above-mentioned each component is fixed on a plane by panel.Strainer both ends, which are wound in, feeds on belt wheel 21 and take-up pulley 22, passes through pressure zone
Frictional force between wheel 27 and transmission shaft 28 realizes filter membrane in absorbent filling system, example enrichment system and detecting system
Between be mutually driven.Belt wheel 21, take-up pulley 22 are fed as the transmission of filter membrane carries out corresponding folding and unfolding filter membrane, smooth wheel 23-26 is protected
Filter membrane is demonstrate,proved in the smooth of transmission process.
The control acquisition system includes：Control board 29, industrial PC 30.Therebetween connected by data cable.
And intelligence software；Intelligence software, timing control, data acquisition, the X-ray that can be automatically performed in the analyzer course of work are glimmering
Spectrum analysis handles and the storage of all data.
X-ray light pipe 17 is 10-100W using power；X-ray fluorescence detector 19 is SDD types.
The detection for mercury element of the analyzer is limited to 0.1 μ g/m3。
The present invention uses the analysis method based on dry method enriched flue gas total mercury in-line analyzer, including following step
Suddenly：
(1) absorbent filling：Air compressor 2 is opened successively, and second solenoid valve 5, the first solenoid valve 3, realizes that compression is empty
Gas drives the injection apparatus 4 based on venturi principle, and a certain amount of powder sorbent (pipe in reagent bottle is extracted from reagent bottle 1
Ensure to go deep into powder sorbent) into buffering 6 in hybrid bottle.Certain injecting time is controlled to ensure in buffering hybrid bottle 6
Suspend a certain amount of powder sorbent, then closes the first solenoid valve 3 and 5 and air compressor 2 successively, the 3rd electricity during this
Magnet valve 7 is constantly in closed mode.Then, load 8 control piper of pipe lifting motor to fall, pipeline seals filter membrane with sample
In centre.Open according to this again and load 11 and the 3rd solenoid valve 7 of pump.The powder sorbent being suspended in buffering hybrid bottle 6 is loaded
With filter membrane surface, the filling of adsorbent is realized.After the completion of load, the 3rd solenoid valve 7 is closed successively and loads pump 11, loads pipe
Control piper lifts lifting motor 8 again.Flue gas processing device 10 can remove the adsorbent that may penetrate filter membrane in whole process,
It is effectively protected to loading pump 11；
(2) sample gas is enriched with：The filter membrane of absorbent filling is completed, the position of sample platform 14 is run to by transmission device
Put.13 control piper of sampling pipe lifting motor is fallen, then opens the 4th solenoid valve 12 and aspiration pump 16 successively.Equally by flue gas
Reason device 10 removes the particulate matter that may penetrate, protects aspiration pump 16, and the sampling flow and volume in whole enrichment process are by flowing
Amount controller 15 is controlled and records.After being enriched with certain volume, the 4th solenoid valve 12 and aspiration pump 16 are closed successively, then
Lifted by 13 control piper of sampling pipe lifting motor, complete the enrichment procedures of sample.
(3) sample detection：The filter membrane of enrichment is completed, the position of detection sample stage 20, industry control are run to by transmission device
Computer 30, which automatically controls, opens light pipe high voltage power supply 18, X-ray light pipe 17 and x-ray fluorescence detector 19.Industrial PC 30 is soft
Part completes the collection and processing of spectrogram, according to built-in working curve, finally can be calculated in sample gas with reference to the data of collection
The concentration of total mercury.
In above-mentioned steps, absorbent filling time, sampling time, sampling volume, detection time pass through industrial PC
Software systems in 30 are configured.The sample being stored on filter membrane, can retain and further be detected for laboratory.
Include the following steps：Absorbent filling → example enrichment → sample detection.The analyzer advantage of the present invention is, leads to
The introducing of efficient powder sorbent is crossed, with reference to filter membrane beneficiation technologies, can realize gaseous mercury in flue gas or ambient air at the same time
With the full enrichment of particulate Hg, then by online x-ray fluorescence technology, finally realize total mercury in flue gas or ambient air
Line analysis.Sample after measure can be preserved directly, easy to the data verification of further experiment room.
The beneficial effects of the present invention are：
1st, the present invention is to be based on total mercury in-line analyzer in dry method enriched flue gas, first by sorbent-loaded on filter membrane,
During followed by example enrichment, since adsorbent can complete the trapping of gaseous mercury, filter membrane can complete the trapping of particulate Hg,
The two combines the enrichment function for finally realizing total mercury.Whole process is converted without pyrolytic conversion or thermocatalytic, hence it is evident that is reduced
Analyzer energy consumption；Subsequent detection greatly reduces cost, less consumptive material without the purging of high-purity carrier gas.
2nd, the present invention uses online x-ray fluorescence detection technique, realizes the quantitative analysis of total mercury in flue gas, the sample of pollution sources
Gas and detection part physical separation, are more suitable for operating mode scene, also reduce the cost of maintenance；X-ray fluorescence detection technique is
Lossless detection method, can recycle test sample compared with existing main stream approach, be easy to implement same sample recycling, retain and
Recheck in laboratory；
3rd, analyzer of the invention is limited to 0.1 μ g/m for the detection of total mercury in flue gas3, it is fully able to meet national standard (GB
The monitoring needs of coal steam-electric plant smoke mercury and mercuric compounds emission request are directed in 13223-2011)；
4th, the present invention is by replacing different adsorbents and supporting sampling pump, additionally it is possible to realize heavy metal in water
Line monitors.
Brief description of the drawings
Fig. 1 is the system schematic based on total mercury in-line analyzer in dry method enriched flue gas of the present invention.
Fig. 2 is using the method for the present invention and does not use the total mercury for steam power plant's scene mercury in-line analyzer of this method to contain
The contrast spectrogram of amount.
In figure, reagent bottle 1, air compressor 2, the first solenoid valve 3, injection apparatus 4, second solenoid valve 5, buffering hybrid bottle
6th, the 3rd solenoid valve 7, filling pipe lifting gear 8, filling sample stage 9, flue gas processing device 10, filling the 11, the 4th solenoid valve of pump
12nd, sampling pipe lifting motor 13, sample platform 14, flow controller 15, aspiration pump 16, X-ray light pipe 17, light pipe high-voltage electricity
Source 18, x-ray fluorescence detector 19, detection sample stage 20, hello belt wheel 21, take-up pulley 22, smooth wheel 23-26, pinch roller 27, biography
Moving axis 28, control board 29, industrial PC 30.
Embodiment
Below in conjunction with the accompanying drawings, the embodiment of the present invention is described in further detail.
The present invention based on total mercury in-line analyzer in dry method enriched flue gas based in dry method enriched flue gas total mercury it is online
Analyzer, it is characterised in that including absorbent filling system, example enrichment system, detecting system, filter membrane transmission system and control
Acquisition system processed；Absorbent filling system realizes filling of the powder sorbent in filter membrane surface, can be uniform by powder sorbent
It is firm to be filled in filter membrane surface, form the adsorption layer for gaseous mercury；Adsorbent is using macromolecule, activated carbon, molecular sieve, silicon
Glue adsorption of modification material, powder size is from nanoscale to mm-scale；Example enrichment system carries out the total mercury in sample gas rich
Collection, by the introducing of adsorbent, with reference to filter membrane, can complete the enrichment of gaseous mercury and particulate Hg in flue gas at the same time, realize flue gas
The full enrichment of middle total mercury；Detecting system carries out online Non-Destructive Testing to the sample of collection, and filter membrane transmission system is each by filter membrane
Transmission between subsystem, control acquisition system realize above-mentioned each system coordination operating and the collection of various data, processing
And storage.
Absorbent filling system mainly realizes coating and filling of the adsorbent in filter membrane surface, is that filter membrane can have enrichment
The ability of total mercury in flue gas.
As shown in Figure 1, absorbent filling system includes reagent bottle 1, air compressor 2, the first solenoid valve 3, injection apparatus
4th, second solenoid valve 5, buffering hybrid bottle 6, electronic valve 7, filling pipe lifting motor 8, filling sample stage 9, flue gas processing device
10th, pump 11 is loaded.Connected between above-mentioned each component by hose, after filling pipe lifting motor is fallen, it is ensured that pipeline is with loading
Sealing between sample stage.Hose lower end in reagent bottle 1 needs to stretch into powder sorbent, ensures to load adsorbent mistake every time
A certain amount of adsorbent can be extracted in journey.
Example enrichment system is used in flue gas total mercury in the enrichment of filter membrane surface, improves the concentration of measurand, improves whole
The Monitoring lower-cut and stability of body analyzer.
As shown in Figure 1, example enrichment system mainly includes the 4th solenoid valve 12, sampling pipe lifting motor 13, collection sample
Platform 14, flue gas processing device 10, gas flow controller 15, aspiration pump 16.Also connected between each component by hose, and can
After being fallen under sampling pipe lifting motor 13, ensure the sealing of pipeline.
The principle that total mercury is enriched with filter membrane is as follows：Required powder sorbent is filled in by filter membrane table by filling system
Face, by designed timing control, ensures that each amount of fill is approximate.Again by filter membrane transmission system, will accurately load
Good filter membrane is transmitted at enrichment, and by extracting sample gas, the gaseous mercury in sample gas is trapped by powder sorbent, and particulate Hg is by filter membrane
Intercept, final total mercury is enriched in filter membrane surface completely.In enrichment process, industrial PC 30 can record the volume V of samplingg, its
The total mercury concentration of middle detection is Cg.Then, the concentration obtained by detecting system is Cs, the area of sampling is Ss.Wherein Cs, Cg,
Ss, VgMeet formula below：
Cs×Ss=Cg×Vg
Due to Ss, VgIt is known that C is obtained by detecting systemsC can be calculatedg, that is, obtained the total mercury in actual sample gas
Concentration.
Detecting system is based on online x-ray fluorescence technology, includes the use of the X-ray light pipe 17 that power is 10-100W
With SDD types detector 19, SDD types detector 19 is freezed using electricity, and integrated level is high, and technology maturation, has higher detection efficient
And energy resolution, it disclosure satisfy that effective detection of the characteristic x-ray fluorescence for mercury；X rays light pipe 17 and detector 19 divide
20 top of detection sample stage is not fixed on.X-ray light pipe 17 is connected with light pipe high voltage power supply 18, light pipe high voltage power supply 18 and industry control
Computer 30 is connected by data cable.Detector 19 is connected by data cable with industrial PC 30, the installation of the inside of industrial PC 30
Software can automatically control X-ray light pipe 17, light pipe high voltage power supply 18 and detector 19, realize the normal work of detecting system
Make.
The principle of X-ray detection mercury element is as follows：X-ray bombardment is on sample, and contained mercury element can quilt in sample
Excitation, produces characteristic X-ray, and ray energy and Atom of Elements Z's is square directly proportional, and the content of element to be measured is sent out with it
The feature X the intensity of spectral line penetrated is related；By the FPGA data process circuit built in detector 19 to gathering, amplifying, after A/D conversions
Digital signal handled, and carry out data transmission and control to communicate with industrial PC 30 by USB interface.Analytic process
In, software can automatic identification mercury and other elements spectral peak, and carry out smooth, the processing such as buckle back scape automatically, whole spectrogram is real
When be shown on the screen of industrial PC 30.The data processing of this method uses peak area method, passes through the spy of automatic identification mercury
Peak is levied, after carrying out buckle back scape, obtains net peak intensity I0 Hg, then by software carry out interference correction after, can obtain new correction intensity
IHg.By using mercury standard membrane sample, obtain corresponding spectral peak IHgData；N different mercury element content sample is taken, is obtained
To one group of IHg(n), wherein n >=3；Draw IHgWith concentration of element C in sampleHgFunctional arrangement, obtain working curve.Pass through again
Concentration (the C of mercury on the relative intensity inverse filter membrane obtained in actually detecteds).C is calculated by above-mentioned formula againg, that is, obtained sample
The concentration of total mercury in gas.This method is selected by the upgrading of software, light path hardware, moreover it is possible to realizes cadmium, lead, arsenic, copper, chromium, zinc etc.
The quantitative analysis of different elements.
Filter membrane transmission system includes feeding belt wheel 21, take-up pulley 22, smooth wheel 23-26, pinch roller 27, transmission shaft 28.Pressure zone
Filter membrane is clamped between wheel 27 and transmission shaft 28, passes through the forward and reverse rotation of transmission shaft 28.Realize paper tape between each system
Transmission.Feed belt wheel 21, take-up pulley 22, transmission shaft 28 with control board 29 to be connected, control board 29 is logical with industrial PC 30
Data cable connection is crossed, the sequential movement control of final filter membrane, there is software control.
Control acquisition system include industrial PC 30 and control board 29, mainly by the software in industrial PC 30 with
And logic circuit realize the processes such as gas circuit in total system, circuit automatically control and system in Various types of data collection, place
Reason and storage.
The analysis method based on total mercury in-line analyzer in dry method enriched flue gas of the present invention, comprises the following steps：
(1) absorbent filling：Air compressor 2 is opened successively, and second solenoid valve 5, the first solenoid valve 3, realizes that compression is empty
Gas drives injection apparatus 4, and a certain amount of powder sorbent is extracted from reagent bottle 1, and (pipe in reagent bottle ensures to go deep into powder adsorption
In agent) into buffering 6 in hybrid bottle.Certain injecting time is controlled to ensure a certain amount of powder that suspends in buffering hybrid bottle 6
Adsorbent, then the first solenoid valve 3 and 5 and air compressor 2 are closed successively, the 3rd solenoid valve 7 is constantly in pass during this
Closed state.Then, load 8 control piper of pipe lifting motor to fall, filter membrane is sealed in centre by pipeline and sample.Open according to this again
Load 11 and the 3rd solenoid valve 7 of pump.By the powder sorbent load being suspended in buffering hybrid bottle 6 and filter membrane surface, realize
The filling of adsorbent.After the completion of load, the 3rd solenoid valve 7 is closed successively and loads pump 11, loads the control pipe again of pipe lifting motor 8
Lift on road.Flue gas processing device 10 can remove the adsorbent that may penetrate filter membrane in whole process, have to loading pump 11
The protection of effect；
(2) sample gas is enriched with：The filter membrane of absorbent filling is completed, the position of sample platform 14 is run to by transmission device
Put.13 control piper of sampling pipe lifting motor is fallen, then opens the 4th solenoid valve 12 and aspiration pump 16 successively.Equally by flue gas
Reason device 10 removes the particulate matter that may penetrate, protects aspiration pump 16, and the sampling flow and volume in whole enrichment process are by flowing
Amount controller 15 is controlled and records.After being enriched with certain volume, the 4th solenoid valve 12 and aspiration pump 16 are closed successively, then
Lifted by 13 control piper of sampling pipe lifting motor, complete the enrichment procedures of sample.
(3) sample detection：The filter membrane of enrichment is completed, the position of detection sample stage 20, industry control are run to by transmission device
Computer 30, which automatically controls, opens light pipe high voltage power supply 18, X-ray light pipe 17 and x-ray fluorescence detector 19.Industrial PC 30 is soft
Part completes the collection and processing of spectrogram, according to built-in working curve, finally can be calculated with reference to the data of collection in flue gas
The concentration of total mercury.
The in-line analyzer based on total mercury in dry method enriched flue gas and analysis method of the present invention passes through software, light path hardware
Upgrading combine, additionally it is possible to realize the different metal element such as cadmium, lead, arsenic, copper, chromium, zinc quantitative analysis or various metals member
Quantitative analysis while plain, has a wide range of application.
The present invention's is limited to based on dry method enriched flue gas mercury in-line analyzer and analysis method for the detection of mercury in flue gas
0.1μg/m3, fully meet and 30 μ g/m of coal steam-electric plant smoke mercury emissions be directed in national standard (GB 13223-2011)3Limit value requirement.
Claims (4)
1. the in-line analyzer of total mercury in a kind of enriched flue gas based on dry method, it is characterised in that including absorbent filling system, sample
Product enrichment system, detecting system, filter membrane transmission system and control acquisition system；Absorbent filling system realizes powder sorbent
In the filling of filter membrane surface, powder sorbent uniformly can be firmly filled in filter membrane surface, form the suction for gaseous mercury
Attached layer；Adsorbent is using macromolecule, activated carbon, molecular sieve, silica gel absorption modified material, and powder size is from nanoscale to millimeter
Scale；Example enrichment system is enriched with the total mercury in sample gas,, can be complete at the same time with reference to filter membrane by the introducing of adsorbent
The enrichment of gaseous mercury and particulate Hg into flue gas, realizes the full enrichment of total mercury in flue gas；Detecting system carries out the sample of collection
Online Non-Destructive Testing, filter membrane transmission system are the transmission between each subsystem by filter membrane, and control acquisition system is realized above-mentioned each
System coordination operates and collection, processing and the storage of various data；
The absorbent filling system includes：Place reagent bottle (1), air compressor (2), the first solenoid valve of powder sorbent
(3), injection apparatus (4), second solenoid valve (5), buffering hybrid bottle (6), the 3rd solenoid valve (7), load pipe lifting motor (8),
Load sample stage (9), flue gas processing device (10), load pump (11)；Reagent bottle is inserted with PTFE tube in (1), ensures the lower end of pipe
Mouth is filled by powder sorbent；There is the connection of PTFE hoses between reagent bottle (1), the first solenoid valve (3), injection apparatus (4)；
Used between air compressor (2), injection apparatus (4), second solenoid valve (5), buffering hybrid bottle (6), the 3rd solenoid valve (7)
PTFE tube connects；Load pipe lifting motor (8) controls it to move up and down by clamping outside PTFE tube；Load sample stage (9), cigarette
Connected between Flash Gas Compression Skid System (10) and filling pump (11) by tracheae；
The example enrichment transmission system includes：4th solenoid valve (12), sampling pipe lifting motor (13), sample platform
(14), flue gas processing device (10), flow controller (15), aspiration pump (16)；4th solenoid valve (12) is front and rear to be all connected with PTFE
Pipe；Sampling pipe lifting motor (13) controls it to move up and down by clamping outside PTFE tube；Sample platform (14), fume treatment
Device (10), flow controller (15), aspiration pump are connected between (16) by tracheae；Pass through the filter after absorbent filling system
Film, can be run to above sample platform (14) by adjusting, and enrichment system can be realized to total mercury by continuous acquisition sample gas
Enrichment；
The detecting system includes：X-ray light pipe (17), light pipe high voltage power supply (18) and x-ray fluorescence detector (19), detection
Sample stage (20)；X-ray light pipe (17) is connected with light pipe high voltage power supply (18) by high-tension bus-bar；X-ray fluorescence detector
(19) it is connected by data cable with industrial PC (30)；
The detecting step of the analyzer is as follows：：
1) absorbent filling：Air compressor (2) is opened successively, and second solenoid valve (5), the first solenoid valve (3), realizes that compression is empty
Gas drives the injection apparatus (4) based on venturi principle, and it is mixed into buffering that a certain amount of powder sorbent is extracted from reagent bottle (1)
Close in bottle in (6)；Certain injecting time is controlled to ensure a certain amount of powder sorbent that suspends in buffering hybrid bottle (6), then according to
The first solenoid valve of secondary closing (3) and second solenoid valve (5) and air compressor (2), the 3rd solenoid valve (7) is always during this
It is closed；Then, load pipe lifting motor (8) control piper to fall, filter membrane is sealed in centre by pipeline and sample；Again
Open according to this and load pump (11) and the 3rd solenoid valve (7)；The powder sorbent being suspended in buffering hybrid bottle (6) is carried on filter
Film surface, realizes the filling of adsorbent；After the completion of load, the 3rd solenoid valve (7) is closed successively and loads pump (11), loads pipe
Control piper lifts lifting motor (8) again；Flue gas processing device (10) can remove the suction that may penetrate filter membrane in whole process
Attached dose, it is effectively protected to loading pump (11)；
2) sample gas is enriched with：The filter membrane of absorbent filling is completed, the position of sample platform (14) is run to by transmission device, is adopted
Sample pipe lifting motor (13) control piper is fallen, then opens the 4th solenoid valve (12) and aspiration pump (16) successively；By fume treatment
Device (10) removes the particulate matter that may penetrate, protection aspiration pump (16), the sampling flow and volume in whole enrichment process by
Flow controller (15) is controlled and records；After being enriched with certain volume, the 4th solenoid valve (12) and pumping are closed successively
Pump (16), then lifted by sampling pipe lifting motor (13) control piper, complete the enrichment procedures of sample；
3) sample detection：The filter membrane of enrichment is completed, the position of detection sample stage (20), industrial PC are run to by transmission device
(30) automatically control and open light pipe high voltage power supply (18), X-ray light pipe (17) and x-ray fluorescence detector (19)；Industrial PC
(30) software completes the collection and processing of spectrogram, and according to built-in working curve, sample is finally calculated with reference to the data of collection
The concentration of total mercury in gas.
2. the in-line analyzer of total mercury in the enriched flue gas according to claim 1 based on dry method, it is characterised in that the filter
Film transmission system includes：Feed belt wheel (21), take-up pulley (22), four smooth wheels, pinch roller (27), transmission shafts (28)；It is above-mentioned each
Component is fixed on a plane by panel；Strainer both ends, which are wound in, feeds on belt wheel (21) and take-up pulley (22), passes through pinch roller
(27) and the frictional force between transmission shaft (28) realizes filter membrane in absorbent filling system, example enrichment system and detection system
Mutually it is driven between system；Belt wheel (21), take-up pulley (22) are fed with the corresponding folding and unfolding filter membrane of transmission progress of filter membrane, four smooth
Wheel ensures filter membrane in the smooth of transmission process.
3. the in-line analyzer of total mercury in the enriched flue gas according to claim 1 based on dry method, it is characterised in that the control
Acquisition system processed includes：Control board (29), industrial PC (30)；Therebetween connected by data cable.
4. the in-line analyzer of total mercury in the enriched flue gas according to claim 1 based on dry method, it is characterised in that X-ray
Light pipe (17) is 10-100W using power；X-ray fluorescence detector (19) is SDD types.
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| CN201510257728.7A CN104833689B (en) | 2015-05-19 | 2015-05-19 | In-line analyzer based on total mercury in dry method enriched flue gas |
| DE102016208569.7A DE102016208569B4 (en) | 2015-05-19 | 2016-05-19 | Online analyzer and analysis method for the enrichment of total mercury in combustion gas based on the drying process |
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| CN105203575B (en) * | 2015-09-24 | 2018-03-27 | 钢研纳克检测技术有限公司 | Water quality heavy metal online analyzer and analysis method based on XRF technology |
| CN105866153A (en) * | 2016-03-31 | 2016-08-17 | 北方工业大学 | Atmosphere heavy metal detection system |
| GB2551980A (en) * | 2016-06-30 | 2018-01-10 | Commw Scient Ind Res Org | Method and system for low level metal analysis of mineral samples |
| CN106855472A (en) * | 2017-03-08 | 2017-06-16 | 中国华能集团清洁能源技术研究院有限公司 | A kind of stationary source particulate Hg and gaseous mercury isokinetic sampling device and the method for sampling |
| CN111398329A (en) * | 2020-04-30 | 2020-07-10 | 江苏天瑞仪器股份有限公司 | Online monitoring method and device for concentration of various target elements in atmosphere |
| CN111398328A (en) * | 2020-04-30 | 2020-07-10 | 江苏天瑞仪器股份有限公司 | On-line monitoring method and monitoring device for concentration of various target elements in flue gas |
| CN111624057A (en) * | 2020-06-10 | 2020-09-04 | 中国科学院地球化学研究所 | Gaseous mercury enrichment device |
| CN112649457A (en) * | 2021-01-15 | 2021-04-13 | 钢研纳克检测技术股份有限公司 | X-ray fluorescence rapid analysis method for trace heavy metal mercury in solid sample |
| CN115253693B (en) * | 2022-08-12 | 2024-04-05 | 苏州胤煌精密仪器科技有限公司 | Filter membrane clamping device for sample filtering treatment |
| CN117269005B (en) * | 2023-06-13 | 2024-05-07 | 中国矿业大学 | Underground multiband real-time black carbon concentration monitor and method based on optical method |
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