CN104833689A - Online analyzer for enriching total mercury in flue gas based on dry process and analysis method - Google Patents
Online analyzer for enriching total mercury in flue gas based on dry process and analysis method Download PDFInfo
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- CN104833689A CN104833689A CN201510257728.7A CN201510257728A CN104833689A CN 104833689 A CN104833689 A CN 104833689A CN 201510257728 A CN201510257728 A CN 201510257728A CN 104833689 A CN104833689 A CN 104833689A
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 97
- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 90
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000003546 flue gas Substances 0.000 title claims abstract description 55
- 238000004458 analytical method Methods 0.000 title abstract description 10
- 238000001035 drying Methods 0.000 title abstract 2
- 239000012528 membrane Substances 0.000 claims abstract description 68
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 238000012545 processing Methods 0.000 claims abstract description 23
- 239000003463 adsorbent Substances 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims abstract description 19
- 238000009659 non-destructive testing Methods 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 57
- 239000000843 powder Substances 0.000 claims description 29
- 238000005070 sampling Methods 0.000 claims description 27
- 239000002594 sorbent Substances 0.000 claims description 27
- 239000002250 absorbent Substances 0.000 claims description 23
- 230000002745 absorbent Effects 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 21
- 239000003153 chemical reaction reagent Substances 0.000 claims description 16
- 230000003139 buffering effect Effects 0.000 claims description 14
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 12
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 12
- 238000013459 approach Methods 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 4
- 239000000284 extract Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229920002521 macromolecule Polymers 0.000 claims description 3
- 239000002808 molecular sieve Substances 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 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
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 11
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 9
- 239000003245 coal Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000012113 quantitative test Methods 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
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 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
- 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
- 238000005265 energy consumption Methods 0.000 description 2
- 229910052751 metal Inorganic materials 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
- 238000001228 spectrum Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 238000004876 x-ray fluorescence Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910000497 Amalgam Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect 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
- 230000001066 destructive effect Effects 0.000 description 1
- 230000037213 diet Effects 0.000 description 1
- 235000005911 diet Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005057 refrigeration 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
- 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 invention provides an online analyzer for enriching total mercury in flue gas based on a dry process and an analysis method and belongs to the technical field of environment monitoring. The online analyzer comprises an adsorbent filling system, a sample enriching system, a detection system, a filter membrane transmission system and a control acquisition system, wherein the adsorbent filling system realizes the filling of a powdered adsorbent on the surface of a filter membrane; the sample enriching system is used for enriching the total mercury in sample gas; the detection system is used for carrying out online nondestructive testing on an acquired sample; the filter membrane transmission system is used for transmitting the filter membrane among all subsystems; and the control acquisition system is used for realizing coordinated operation of all the systems and acquisition, processing and storage of all data. The analysis method comprises the following steps: filling the adsorbent, enriching the sample and detecting the sample. The online analyzer and the analysis method have the advantages that the efficient powdered adsorbent is introduced and a filter membrane enriching technology is combined, so that whole enriching of gas-state mercury and mercury particles in the flue gas or the environmental atmosphere can be realized at the same time; and an online X-ray fluorescent technology is used for detecting to finally realize the online analysis of the total mercury in the flue gas or the environmental atmosphere.
Description
Technical field
The invention belongs to environmental monitoring technology field, be specifically related to a kind of in-line analyzer based on total mercury in dry method enriched flue gas and analytical approach.
Background technology
Mercury and mercuric compounds can pass through multiple channel entered environment, and its discharge is mainly divided into natural source (volcanic eruption etc.) and artificial source, and wherein artificial source is topmost mercury pollution source, and in human activity, fuel combustion is of paramount importance one side.There are some researches show, the discharge capacity of the coal-fired mercury in the whole world accounts for about 65% of total release, calculate according to the average mercury content 0.188mg/kg of Chinese coal, in the coal-fired industry of China, the factor of Mercury In The Air discharge reaches as high as more than 70%, and wherein the mercury emissions of coal-burning power plant accounts for more than 30% of Mercury In The Air total emission volumn, occupy industry first place.Mercury and mercuric compounds has very strong bio-toxicity, enters human body, be difficult to be discharged, cause serious harm to human body after entering biosome by modes such as breathing, skin contact, diet.Therefore on-line monitoring is carried out for the total mercury in flue gas significant.
The gas mercury in-line analyzer of current main flow mainly for be the mensuration of gaseous mercury (comprising element mercury and ionic mercury), also cannot measure for particulate Hg, therefore cannot realize the detection of total mercury.For the mensuration of gaseous mercury mainly by the enrichment method of gold amalgam, this method cost is higher, and all need high-purity carrier gas purge after enrichment, Cold Atomic Fluorescent Mercury or Clod Vapour Atomic Absorption technology is adopted to detect after being convenient to, and no matter being Cold Atomic Fluorescent Mercury or Clod Vapour Atomic Absorption technology, is all directly for elemental mercury (Hg
0) detection, in order to complete the mensuration of different valence state mercury, need the conversion (Hg carrying out mercury valence state toward contact
2+→ Hg
0), the method of general employing is thermocatalysis conversion method and pyrolytic conversion method, and wherein, thermocatalysis conversion method is under 200 ~ 400 DEG C of conditions, by catalytic reaction, ion state mercury is converted into elemental mercury, owing to have employed catalytic reaction, make inversion temperature compare pyrolytic conversion temperature low, catalytic treatment is relatively simple, do not need chemical reagent, but needing to prevent catalyst poisoning to configure conversion system for subsequent use, bringing the rising of instrument cost, also there is life problems in catalyzer simultaneously; Pyrolytic conversion method is under high temperature (>800 DEG C) condition, ionic mercury can be reduced into elemental mercury, this method is without the need to using chemical reagent and catalyzer, at high temperature method for transformation is reliable, but it is higher to the requirement of instrument and pipeline, there is potential safety hazard in high temperature simultaneously, and bring the rising of overall instrument energy consumption.In addition, above-mentioned on-line analysis all belongs to destructive detection, cannot be that sample is preserved in the data verification of subsequent experimental room.
Summary of the invention
The object of the invention is to provide a kind of in-line analyzer based on total mercury in dry method enriched flue gas and analytical approach, adopt online XRF Dynamic Non-Destruction Measurement, can carry out on-line analysis for the total mercury of fume emission (comprising gaseous mercury and particulate Hg), sensitivity, stability and reappearance are good.
In-line analyzer based on total mercury in dry method enriched flue gas of the present invention, adopt online x-ray fluorescence analysis technology, this analyser comprises absorbent filling system, example enrichment system, detection system, filter membrane kinematic train and controls acquisition system, wherein, absorbent filling system realizes the filling of powder sorbent at filter membrane surface, powder sorbent evenly firmly can be loaded in filter membrane surface, form the adsorbed layer for gaseous mercury; Adsorbent can adopt the adsorption of modification materials such as macromolecule, activated charcoal, molecular sieve, silica gel, and powder size can from nanoscale to mm-scale.Example enrichment system carries out enrichment to the total mercury (comprising gaseous mercury and particulate Hg) in sample gas, by the introducing of adsorbent, in conjunction with filter membrane, can complete the enrichment of gaseous mercury and particulate Hg in flue gas simultaneously, realize the full enrichment of total mercury in flue gas; Detection system carries out online Non-Destructive Testing to the sample gathered, and filter membrane kinematic train is by the transmission of filter membrane between each subsystem, controls acquisition system and realizes the collection of above-mentioned each system coordination running and various data, process and storage.Absorbent filling system,
Described absorbent filling system comprises: place the reagent bottle 1 of powder sorbent, air compressor 2, first solenoid valve 3, jetting system 4, second solenoid valve 5, buffering hybrid bottle 6, the 3rd solenoid valve 7, load pipe lifting motor 8, filling sample stage 9, flue gas processing device 10, load pump 11.Be inserted with PTFE tube in reagent bottle 1, ensure that the lower port of pipe is by powder sorbent institute landfill.PTFE flexible pipe is all had to connect between reagent bottle 1, first solenoid valve 3, jetting system 4.PTFE tube is all adopted to connect between air compressor 2, jetting system 4, second solenoid valve 5, buffering hybrid bottle 6, the 3rd solenoid valve 7.It moves up and down by clamping PTFE tube external control to load pipe lifting motor 8.Load sample stage 9, flue gas processing device 10 and load between pump 11 and connected by tracheae.This system mainly realizes the even filling of powder sorbent at filter membrane surface.
Described example enrichment kinematic train comprises: the 4th solenoid valve 12, sampling pipe lifting motor 13, sample platform 14, flue gas processing device 10, flow controller 15, sampling pump 16.All PTFE tube is connected before and after 4th solenoid valve 12.By clamping PTFE tube external control, it moves up and down sampling pipe lifting motor 13.Connected by tracheae between sample platform 14, flue gas processing device 10, flow controller 15, sampling pump 16.By the filter membrane after absorbent filling system, can run to above sample platform 14 by regulating, enrichment system can realize the enrichment to total mercury by continuous acquisition sample gas;
Described detection system comprises: X ray light pipe 17, light pipe high-voltage power supply 18 and XRF detecting device 19, detection sample stage 20.X ray light pipe 17 is connected by high-tension bus-bar with light pipe high-voltage power supply 18.XRF detecting device 19 is connected with industrial PC 30 by data line.
Described filter membrane kinematic train comprises: feed belt wheel 21, take-up pulley 22, smoothly take turns 23-26, pinch roller 27, transmission shaft 28.Above-mentioned each parts are fixed on a plane by panel.Strainer two ends are wound in feeds on belt wheel 21 and take-up pulley 22, realizes filter membrane mutual transmission between absorbent filling system, example enrichment system and detection system by the friction force between pinch roller 27 and transmission shaft 28.Feed belt wheel 21, take-up pulley 22 and carry out corresponding folding and unfolding filter membrane along with the transmission of filter membrane, the smooth 23-26 that takes turns ensures smooth at transmission process of filter membrane.
Described control acquisition system comprises: control circuit board 29, industrial PC 30.Therebetween connected by data line.And intelligent software; Intelligent software, can complete the storage of the sequential control in the analyser course of work, data acquisition, the process of XRF analysis of spectrum and all data automatically.
The use power of X ray light pipe 17 is 10-100W; XRF detecting device 19 is SDD type.
The detection for mercury element of this analyser is limited to 0.1 μ g/m
3.
The present invention adopts the described analytical approach based on dry method enriched flue gas total mercury in-line analyzer, comprises the following steps:
(1) absorbent filling: open air compressor 2 successively, second solenoid valve 5, first solenoid valve 3, realize pressurized air to drive based on the jetting system 4 of venturi principle, from reagent bottle 1, extract a certain amount of powder sorbent (pipe in reagent bottle is guaranteed to go deep in powder sorbent) to enter in buffering hybrid bottle in 6.Control certain injecting time and ensure to suspend in buffering hybrid bottle 6 a certain amount of powder sorbent, then close the first solenoid valve 3 and 5 and air compressor 2 successively, in this process, the 3rd solenoid valve 7 is in closed condition always.Subsequently, load pipe lifting motor 8 pilot piping and fall, filter membrane is sealed in centre by pipeline and sample.Open aspiration pump 11 and the 3rd solenoid valve 7 according to this again.By be suspended in buffering hybrid bottle 6 in powder sorbent load and filter membrane surface, achieve the filling of adsorbent.After load completes, close the 3rd solenoid valve 7 and aspiration pump 11 successively, filling pipe lifting motor 8 again pilot piping lifts.In whole process, flue gas processing device 10 can remove the adsorbent that may penetrate filter membrane, effectively protects aspiration pump 11;
(2) sample gas enrichment: the filter membrane completing absorbent filling, runs to the position of sample platform 14 by gearing.Sampling pipe lifting motor 13 pilot piping falls, then opens the 4th solenoid valve 12 and aspiration pump 16 successively.Remove the particle that may penetrate by flue gas processing device 10 equally, protection aspiration pump 12, the sampling flow in whole enrichment process and volume are undertaken controlling and record by flow controller 15.After the volume that enrichment is certain, close the 4th solenoid valve 12 and aspiration pump 16 successively, then lifted by sampling pipe lifting motor 13 pilot piping, complete the enrichment procedures of sample.
(3) sample detection: the filter membrane completing enrichment, runs to the position detecting sample stage 20 by gearing, industrial PC 30 controls to open light pipe high-voltage power supply 18, X ray light pipe 17 and XRF detecting device 19 automatically.Industrial PC 30 software completes the acquisition and processing of spectrogram, according to built-in working curve, finally can be calculated the concentration of total mercury in sample gas in conjunction with the data gathered.
In above-mentioned steps, absorbent filling time, sampling time, sampling volume, detection time are all configured by the software systems in industrial PC 30.Be kept at the sample on filter membrane, can retain and detect further for laboratory.
Comprise the steps: absorbent filling → example enrichment → sample detection.Analyser advantage of the present invention is, by the introducing of efficient powder sorbent, in conjunction with filter membrane beneficiation technologies, the full enrichment of gaseous mercury and particulate Hg in flue gas or ambient atmosphere can be realized simultaneously, again by online XRF technology, finally realize the on-line analysis of total mercury in flue gas or ambient atmosphere.Sample after mensuration can directly be preserved, and is convenient to the data verification of further experiment room.
Beneficial effect of the present invention is:
1, the present invention is based on total mercury in-line analyzer in dry method enriched flue gas, first by sorbent-loaded on filter membrane, when carrying out example enrichment subsequently again, because adsorbent can complete the trapping of gaseous mercury, filter membrane can complete the trapping of particulate Hg, and the two combines the enrichment function finally achieving total mercury.Whole process transforms without the need to pyrolytic conversion or thermocatalysis, obviously reduces analyser energy consumption; Subsequent detection also without the need to the purging of high-purity carrier gas, greatly reduces cost, less consumptive material.
2, the present invention adopts online XRF detection technique, realizes the quantitative test of total mercury in flue gas, the sample gas of pollution source and detecting portion physical separation, is more applicable to operating mode on-the-spot, also reduces the cost of maintenance; XRF detection technique is lossless detection method, can reclaim test sample compared with existing main stream approach, is convenient to realize the recovery of same sample, retention and laboratory and rechecks;
3, analyser of the present invention is limited to 0.1 μ g/m for the detection of total mercury in flue gas
3, the monitoring needs for coal steam-electric plant smoke mercury and mercuric compounds emission request in GB (GB 13223-2011) can be met completely;
4, the present invention is by changing different adsorbents and supporting sampling pump, can also realize the on-line monitoring of heavy metal in water.
Accompanying drawing explanation
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 the contrast spectrogram of the total mercury content for the on-the-spot mercury in-line analyzer of cogeneration plant adopting the inventive method and do not adopt this method.
In figure, reagent bottle 1, air compressor 2, first solenoid valve 3, jetting system 4, second solenoid valve 5, buffering hybrid bottle 6, 3rd solenoid valve 7, load pipe jacking gear 8, load sample stage 9, flue gas processing device 10, load pump 11, 4th solenoid valve 12, sampling pipe lifting motor 13, sample platform 14, flow controller 15, sampling pump 16, X ray light pipe 17, light pipe high-voltage power supply 18, XRF detecting device 19, detect sample stage 20, feed belt wheel 21, take-up pulley 22, smoothly take turns 23-26, pinch roller 27, transmission shaft 28, control circuit board 29, industrial PC 30.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Of the present invention based on the in-line analyzer of total mercury in-line analyzer in dry method enriched flue gas based on total mercury in dry method enriched flue gas, it is characterized in that, comprise absorbent filling system, example enrichment system, detection system, filter membrane kinematic train and control acquisition system; Absorbent filling system realizes the filling of powder sorbent at filter membrane surface, powder sorbent evenly firmly can be loaded in filter membrane surface, form the adsorbed layer for gaseous mercury; Adsorbent adopts macromolecule, activated charcoal, molecular sieve, silica gel adsorption material modified, and powder size is from nanoscale to mm-scale; Example enrichment system carries out enrichment to the total mercury in sample gas, by the introducing of adsorbent, in conjunction with filter membrane, can complete the enrichment of gaseous mercury and particulate Hg in flue gas simultaneously, realize the full enrichment of total mercury in flue gas; Detection system carries out online Non-Destructive Testing to the sample gathered, and filter membrane kinematic train is by the transmission of filter membrane between each subsystem, controls acquisition system and realizes the collection of above-mentioned each system coordination running and various data, process and storage.
Absorbent filling system mainly realizes adsorbent in the coating of filter membrane surface and filling, is the ability that filter membrane can have total mercury in enriched flue gas.
As shown in Figure 1, absorbent filling system comprises reagent bottle 1, air compressor 2, first solenoid valve 3, jetting system 4, second solenoid valve 5, buffering hybrid bottle 6, electrovalve 7, loads pipe lifting motor 8, filling sample stage 9, flue gas processing device 10, loads pump 11.All connected by flexible pipe between above-mentioned each parts, after filling pipe lifting motor falls, the sealing guaranteed pipeline and load between sample stage.Flexible pipe lower end in reagent bottle 1 needs to stretch in powder sorbent, ensures that each filling in adsorbent process can extract a certain amount of adsorbent.
Example enrichment system is used for total mercury in flue gas and, in the enrichment of filter membrane surface, improves the concentration of measurand, improves Monitoring lower-cut and the stability of holistic approach instrument.
As shown in Figure 1, example enrichment system mainly comprises the 4th solenoid valve 12, sampling pipe lifting motor 13, collected specimens platform 14, flue gas processing device 10, gas flow controller 15, sampling pump 16.Also connect by flexible pipe between each parts, and after sampling pipe lifting motor falls for 13 times, the sealing of pipeline can be ensured.
Total mercury principle of enrichment in filter membrane is as follows: load in filter membrane surface by filling system by required powder sorbent, by the sequential control designed, ensures that each amount of fill is similar to.Again by filter membrane kinematic train, accurately the filter membrane loaded is sent to enrichment place, by extracting sample gas, the gaseous mercury in sample gas is trapped by powder sorbent, and particulate Hg is tackled by filter membrane, and final total mercury is enriched in filter membrane surface completely.In enrichment process, industrial PC 30 can record the volume V of sampling
g, the total mercury concentration wherein detected is C
g.Subsequently, the concentration obtained by detection system is C
s, the area of sampling is S
s.Wherein C
s, C
g, S
s, V
gmeet formula below:
C
s×S
s＝C
g×V
g
Due to S
s, V
gknown, obtain C by detection system
sc can be calculated
g, namely obtain the concentration of the total mercury in actual sample gas.
Detection system is based on the XRF technology of line, comprise and use the X ray light pipe 17 and SDD type detecting device 19 that power is 10-100W, SDD type detecting device 19 adopts electricity refrigeration, integrated level is high, technology maturation, there is higher detection efficiency and energy resolution, effective detection of the characteristic x-ray fluorescence for mercury can be met; X ray light pipe 17 and detecting device 19 are individually fixed in and detect above sample stage 20.X ray light pipe 17 is connected with light pipe high-voltage power supply 18, and light pipe high-voltage power supply 18 is connected by data line with industrial PC 30.Detecting device 19 is connected with industrial PC 30 by data line, and the software that industrial PC 30 inside is installed can control X ray light pipe 17, light pipe high-voltage power supply 18 and detecting device 19 automatically, realizes the normal work of detection system.
The principle that X ray detects mercury element is as follows: x-ray bombardment is on sample, mercury element contained in sample can be excited, produce characteristic X-ray, ray energy and Atom of Elements Z square are directly proportional, and the content of element to be measured is relevant with feature X line strength of its transmitting; Digital signal by the built-in FPGA data processing circuit of detecting device 19 to gathering, amplify, after A/D conversion processes, and carries out data transmission by USB interface and industrial PC 30 and communicate with controlling.In analytic process, software can identify the spectrum peak of mercury and other elements automatically, and automatically smoothing, and the process such as buckle back scape, whole spectrogram is presented on the screen of industrial PC 30 in real time.The data processing of this method adopts peak area method, by automatically identifying the characteristic peak of mercury, after carrying out buckle back scape, obtains clean peak intensity I
0 hg, then after carrying out interference correction by software, new correction intensity I can be obtained
hg.By the standard film sample of the mercury of use, composed peak I accordingly
hgdata; Get n different mercury element content sample, obtain one group of I
hg(n), wherein n>=3; Draw I
hgwith this concentration of element C in sample
hgfunctional arrangement, obtain working curve.Concentration (the C of mercury on the relative intensity inverse filter membrane obtained in being detected by reality again
s).Again by above-mentioned formulae discovery C
g, namely obtain the concentration of total mercury in sample gas.This method is selected by the upgrading of software, light path hardware, can also realize the quantitative test of the different elements such as cadmium, lead, arsenic, copper, chromium, zinc.
Filter membrane kinematic train comprises feeds belt wheel 21, take-up pulley 22, smoothly takes turns 23-26, pinch roller 27, transmission shaft 28.Filter membrane is clamped, by forward and reverse rotation of transmission shaft 28 between pinch roller 27 and transmission shaft 28.Realize the transmission of paper tape between each system.Hello belt wheel 21, take-up pulley 22, transmission shaft 28 are connected with control circuit board 29, and control circuit board 29 is connected by data line with industrial PC 30, and the sequential of final filter membrane moves control, has software control.
Control acquisition system and comprise industrial PC 30 and control circuit board 29, realize the collection of Various types of data in the automatic control of the process such as gas circuit, circuit in total system and system, process and storage mainly through the software in industrial PC 30 and logical circuit.
Analytical approach based on total mercury in-line analyzer in dry method enriched flue gas of the present invention, comprises the following steps:
(1) absorbent filling: open air compressor 2 successively, second solenoid valve 5, first solenoid valve 3, realize pressurized air and drive jetting system 4, from reagent bottle 1, extract a certain amount of powder sorbent (pipe in reagent bottle is guaranteed to go deep in powder sorbent) to enter in buffering hybrid bottle in 6.Control certain injecting time and ensure to suspend in buffering hybrid bottle 6 a certain amount of powder sorbent, then close the first solenoid valve 3 and 5 and air compressor 2 successively, in this process, the 3rd solenoid valve 7 is in closed condition always.Subsequently, load pipe lifting motor 8 pilot piping and fall, filter membrane is sealed in centre by pipeline and sample.Open aspiration pump 11 and the 3rd solenoid valve 7 according to this again.By be suspended in buffering hybrid bottle 6 in powder sorbent load and filter membrane surface, achieve the filling of adsorbent.After load completes, close the 3rd solenoid valve 7 and aspiration pump 11 successively, filling pipe lifting motor 8 again pilot piping lifts.In whole process, flue gas processing device 10 can remove the adsorbent that may penetrate filter membrane, effectively protects aspiration pump 11;
(2) sample gas enrichment: the filter membrane completing absorbent filling, runs to the position of sample platform 14 by gearing.Sampling pipe lifting motor 13 pilot piping falls, then opens the 4th solenoid valve 12 and aspiration pump 16 successively.Remove the particle that may penetrate by flue gas processing device 10 equally, protection aspiration pump 12, the sampling flow in whole enrichment process and volume are undertaken controlling and record by flow controller 15.After the volume that enrichment is certain, close the 4th solenoid valve 12 and aspiration pump 16 successively, then lifted by sampling pipe lifting motor 13 pilot piping, complete the enrichment procedures of sample.
(3) sample detection: the filter membrane completing enrichment, runs to the position detecting sample stage 20 by gearing, industrial PC 30 controls to open light pipe high-voltage power supply 18, X ray light pipe 17 and XRF detecting device 19 automatically.Industrial PC 30 software completes the acquisition and processing of spectrogram, according to built-in working curve, finally can be calculated the concentration of total mercury in flue gas in conjunction with the data gathered.
In-line analyzer based on total mercury in dry method enriched flue gas of the present invention and analytical approach are combined by the upgrading of software, light path hardware, the quantitative test of different metal element or the Simultaneous Quantitative Analysis of Determination of multiple metal elements such as cadmium, lead, arsenic, copper, chromium, zinc can also be realized, applied range.
Of the present inventionly be limited to 0.1 μ g/m based on dry method enriched flue gas mercury in-line analyzer and analytical approach for the detection of mercury in flue gas
3, meet completely in GB (GB 13223-2011) for coal steam-electric plant smoke mercury emissions 30 μ g/m
3limit value requirement.
Claims (8)
1. based on an in-line analyzer for total mercury in dry method enriched flue gas, it is characterized in that, comprise absorbent filling system, example enrichment system, detection system, filter membrane kinematic train and control acquisition system; Absorbent filling system realizes the filling of powder sorbent at filter membrane surface, powder sorbent evenly firmly can be loaded in filter membrane surface, form the adsorbed layer for gaseous mercury; Adsorbent adopts macromolecule, activated charcoal, molecular sieve, silica gel adsorption material modified, and powder size is from nanoscale to mm-scale; Example enrichment system carries out enrichment to the total mercury in sample gas, by the introducing of adsorbent, in conjunction with filter membrane, can complete the enrichment of gaseous mercury and particulate Hg in flue gas simultaneously, realize the full enrichment of total mercury in flue gas; Detection system carries out online Non-Destructive Testing to the sample gathered, and filter membrane kinematic train is by the transmission of filter membrane between each subsystem, controls acquisition system and realizes the collection of above-mentioned each system coordination running and various data, process and storage.
2. the in-line analyzer based on total mercury in dry method enriched flue gas according to claim 1, it is characterized in that, described absorbent filling system comprises: place the reagent bottle (1) of powder sorbent, air compressor (2), the first solenoid valve (3), jetting system (4), the second solenoid valve (5), buffering hybrid bottle (6), the 3rd solenoid valve (7), load pipe lifting motor (8), filling sample stage (9), flue gas processing device (10), load pump (11); Reagent bottle is inserted with PTFE tube in (1), ensures that the lower port of pipe is by powder sorbent institute landfill; PTFE flexible pipe is all had to connect between reagent bottle (1), the first solenoid valve (3), jetting system (4); PTFE tube is all adopted to connect between air compressor (2), jetting system (4), the second solenoid valve (5), buffering hybrid bottle (6), the 3rd solenoid valve (7); It moves up and down by clamping PTFE tube external control to load pipe lifting motor (8); Load sample stage (9), flue gas processing device (10) and load between pump (11) and connected by tracheae.
3. the in-line analyzer based on total mercury in dry method enriched flue gas according to claim 1, it is characterized in that, described example enrichment kinematic train comprises: the 4th solenoid valve (12), sampling pipe lifting motor (13), sample platform (14), flue gas processing device (10), flow controller (15), sampling pump (16); All PTFE tube is connected before and after 4th solenoid valve (12); By clamping PTFE tube external control, it moves up and down sampling pipe lifting motor (13); Sample platform (14), flue gas processing device (10), flow controller (15), sampling pump are connected by tracheae between (16); By the filter membrane after absorbent filling system, can run to sample platform (14) top by regulating, enrichment system can realize the enrichment to total mercury by continuous acquisition sample gas.
4. the in-line analyzer based on total mercury in dry method enriched flue gas according to claim 1, it is characterized in that, described detection system comprises: X ray light pipe (17), light pipe high-voltage power supply (18) and XRF detecting device (19), detection sample stage 20; X ray light pipe (17) is connected by high-tension bus-bar with light pipe high-voltage power supply (18).XRF detecting device (19) is connected with industrial PC (30) by data line.
5. the in-line analyzer based on total mercury in dry method enriched flue gas according to claim 1, it is characterized in that, described filter membrane kinematic train comprises: feed belt wheel (21), take-up pulley (22), four smoothly to take turns, pinch roller (27), transmission shaft (28); Above-mentioned each parts are fixed on a plane by panel; Strainer two ends are wound in feeds belt wheel (21) and take-up pulley (on 22), realizes filter membrane mutual transmission between absorbent filling system, example enrichment system and detection system by the friction force between pinch roller (27) and transmission shaft (28); Feed belt wheel (21), take-up pulley (22) and carry out corresponding folding and unfolding filter membrane along with the transmission of filter membrane, four smooth takes turns and ensures smooth at transmission process of filter membrane.
6. the in-line analyzer based on total mercury in dry method enriched flue gas according to claim 1, is characterized in that, described control acquisition system comprises: control circuit board (29), industrial PC (30); Therebetween connected by data line.
7. the in-line analyzer based on total mercury in dry method enriched flue gas according to claim 4, is characterized in that, the use power of X ray light pipe (17) is 10-100W; XRF detecting device (19) is SDD type.
8. adopt an analytical approach for the in-line analyzer of claim 1-7 described in any one, it is characterized in that, comprise the following steps:
1) absorbent filling: open air compressor (2) successively, second solenoid valve (5), first solenoid valve (3), realizing pressurized air drives based on the jetting system (4) of venturi principle, extracts a certain amount of powder sorbent and enter and to cushion in hybrid bottle in (6) from reagent bottle (1); Control certain injecting time and ensure to suspend in buffering hybrid bottle (6) a certain amount of powder sorbent, close the first solenoid valve (3) and the second solenoid valve 5 and air compressor (2) more successively, in this process, the 3rd solenoid valve (7) is in closed condition always; Subsequently, load pipe lifting motor (8) pilot piping and fall, filter membrane is sealed in centre by pipeline and sample.Open aspiration pump (11) and the 3rd solenoid valve (7) more according to this; The powder sorbent load in buffering hybrid bottle (6) and filter membrane surface will be suspended in, achieve the filling of adsorbent; After load completes, close the 3rd solenoid valve (7) and aspiration pump (11) successively, filling pipe lifting motor (8) again pilot piping is lifted; In whole process, flue gas processing device (10) can remove the adsorbent that may penetrate filter membrane, effectively protects aspiration pump (11);
2) sample gas enrichment: the filter membrane completing absorbent filling, the position of sample platform (14) is run to by gearing, sampling pipe lifting motor (13) pilot piping falls, then opens the 4th solenoid valve (12) and aspiration pump (16) successively; Removed the particle that may penetrate by flue gas processing device (10), protection aspiration pump (12), the sampling flow in whole enrichment process and volume are undertaken controlling and record by flow controller (15); After the volume that enrichment is certain, close the 4th solenoid valve (12) and aspiration pump (16) successively, then lifted by sampling pipe lifting motor (13) pilot piping, complete the enrichment procedures of sample;
(3) sample detection: the filter membrane completing enrichment, the position detecting sample stage (20) is run to by gearing, industrial PC (30) controls to open light pipe high-voltage power supply (18), X ray light pipe (17) and XRF detecting device (19) automatically; Industrial PC (30) software completes the acquisition and processing of spectrogram, according to built-in working curve, finally calculates the concentration of total mercury in sample gas in conjunction with the data gathered.
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| DE102016208569B4 (en) | 2021-02-04 |
| DE102016208569A1 (en) | 2016-11-24 |
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