CN108896519A - Double spectrum gas mercury analytical equipments and corresponding method - Google Patents
Double spectrum gas mercury analytical equipments and corresponding method Download PDFInfo
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- CN108896519A CN108896519A CN201810488995.9A CN201810488995A CN108896519A CN 108896519 A CN108896519 A CN 108896519A CN 201810488995 A CN201810488995 A CN 201810488995A CN 108896519 A CN108896519 A CN 108896519A
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 157
- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 156
- 238000001228 spectrum Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000005259 measurement Methods 0.000 claims abstract description 62
- 238000012360 testing method Methods 0.000 claims abstract description 44
- 230000003287 optical effect Effects 0.000 claims abstract description 34
- 230000003447 ipsilateral effect Effects 0.000 claims abstract description 5
- 238000000862 absorption spectrum Methods 0.000 claims description 14
- 238000000103 photoluminescence spectrum Methods 0.000 claims description 14
- 238000002795 fluorescence method Methods 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 claims description 6
- 238000001479 atomic absorption spectroscopy Methods 0.000 claims description 5
- 238000002189 fluorescence spectrum Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 230000005622 photoelectricity Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 147
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 13
- 239000003546 flue gas Substances 0.000 abstract description 13
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000003786 synthesis reaction Methods 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 description 11
- 238000012544 monitoring process Methods 0.000 description 8
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulfur dioxide Inorganic materials O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 8
- 238000012545 processing Methods 0.000 description 5
- 238000002133 sample digestion Methods 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 4
- 239000003245 coal Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 3
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 238000002530 cold vapour atomic fluorescence spectroscopy Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000001658 differential optical absorption spectrophotometry Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004611 spectroscopical analysis Methods 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- 229910000497 Amalgam Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000004847 absorption spectroscopy Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000002482 cold vapour atomic absorption spectrometry Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- -1 k=0 Chemical compound 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004846 x-ray emission Methods 0.000 description 1
- 238000004876 x-ray fluorescence Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/3103—Atomic absorption analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/3103—Atomic absorption analysis
- G01N2021/3107—Cold vapor, e.g. determination of Hg
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N2021/6417—Spectrofluorimetric devices
Abstract
The present disclosure discloses a kind of double spectrum gas mercury analytical equipments and corresponding method, double spectrum gas mercury analytical equipments include：Light source, gas chamber, optical detector and control module, wherein：The gas chamber is for storing tested gas；The light source is placed in the side of the gas chamber, for issuing gas chamber described in measurement light-wave irradiation；The optical detector be it is two or more, be placed in the not ipsilateral of the gas chamber, and connect with control module, for detecting the measurement light wave through gas chamber, and will test data and be sent to the control module.Disclosed technique schemes synthesis utilizes many measuring methods, can accurately measure the content of mercury in flue gas, have many advantages, such as that structure is simple, measurement structure is accurate, can be widely applied in mercury content on-line checking.
Description
Technical field
This disclosure relates to technical field of analytical instruments, especially a kind of double spectrum gas mercury analytical equipments and corresponding side
Method.
Background technique
Due to rapid industrial development, human activity mercury emissions are increasingly becoming a main source of Mercury In The Air in environment.Coal
Charcoal belongs to one of energy mineral resources, is the important substance of economy and society development all over the world.The industrial requirement whole world every year with
The a large amount of coal of larger growth trend burning, the mercury discharged from fire coal account for the significant proportion of the discharged mercury of mankind's activity.
In October, 2013, " diplomatic conference of mercury treaty " sponsored by United Nations Environment Programme are decided by vote logical in Kumamoto, Japan city
It has crossed and has been intended to control and reduce global mercury emissions《Minamata pact》, the representatives of 87 countries and regions including China is total
With signature pact, indicate that the whole world reduces mercury pollution hand in hand and steps the first step.Pact thinks that Small Gold Mine and coal fired power plant are mercury
The largest source of pollution.Therefore carrying out real-time monitoring to the mercury in flue gas becomes a kind of necessary means.
In thermal power plant, the typical concentration of emission usually only 0.01ppm of mercury is compared and SO2Or NOXFor, concentration is wanted
The low 4-5 order of magnitude.Thus the on-line monitoring difficulty of mercury is big, and existing gas mercury monitoring technology mainly takes flue to extract sampling
Gas obtains the concentration of mercury by the method for optical monitoring after pretreatment.Different optical monitoring methods are to whole system
The building of system and measurement accuracy have vital influence, therefore optical monitoring technique study is element mercury on-line monitoring technique
Core.
The optical monitoring method of mercury mainly has cold vapor atoms absorption spectrum (Cold vapor atomic at present
Absorption spectroscopy, CVAAS), cold vapor atoms fluorescence spectrum (Cold vapor atomic
Fluorescence spectroscopy, CVAFS), atomic emission spectrum (Atomic emission sectrometry,
AES), X-ray fluorescence spectra (X-ray fluorescence spectroscopy) and ultraviolet difference absorption spectrum
(Ultraviolet differential optical absorption spectroscopy,UV-DOAS).Presently the most at
Ripe is Clod Vapour Atomic Absorption spectrum and cold vapor atoms fluorescent spectrometry, and Sai Mo company of the U.S. is proposed using Cold Atomic Fluorescent Mercury light
The Hangzhou optically focused of the test equipment of spectrometry, German MI, kyoto, Japan electronics and China is all proposed based on Clod Vapour Atomic Absorption spectrum
The test equipment of method.
The method of general optical measurement all has strong absorption using ultraviolet light of the mercury atom to 253.7nm, and this is special
Property, pass through the variation of mercury fume, by measurement ultraviolet light to obtain the concentration of mercury.But it is a large amount of due to containing in coal-fired flue-gas
The foreign gases such as sulfur dioxide, nitric oxide also have strong absorption to ultraviolet light, so the measurement of mercury content is general
It is to be carried out after desulphurization and denitration processing.This process can remove the gas such as most sulfur dioxide, nitric oxide in flue gas
Body.The above method assumes that the gas for being wherein free of and capable of having absorbed ultraviolet light in addition to ultraviolet difference absorption spectrum.And ultraviolet difference
The mode divided is needed there are two independent gas chamber and measuring system, if reference gas uses calibrating gas, nothing in measurement result
The influence of method removal foreign gas；If reference gas is using the flue gas after the removal of mercury is removed, presence can not completely remove mercury, while can
Foreign gas can be removed, the possibility of reference inaccuracy is caused.
Summary of the invention
In order to solve above-mentioned problems of the prior art, the disclosure is measured using atomic absorption method and atomic fluorescence method
The different feature of optical path, two values of measurement simultaneously, the influence of foreign gas is removed by numerical value processing mode in same gas chamber.
According to the one side of the disclosure, a kind of double spectrum gas mercury analytical equipments, double spectrum gas mercury analyses are proposed
Device includes：Light source, gas chamber, optical detector and control module, wherein：
The gas chamber is for storing tested gas；
The light source is placed in the side of the gas chamber, for issuing gas chamber described in measurement light-wave irradiation；
The optical detector be it is two or more, be placed in the not ipsilateral of the gas chamber, and connect with control module, be used for
Detection penetrates the measurement light wave of gas chamber, and will test data and be sent to the control module.
Optionally, the light source is low pressure mercury lamp.
Optionally, the light source generates the ultraviolet light of 253.7nm.
Optionally, the optical detector is two, and one is placed in the gas chamber side opposite with the light source, is inhaled for detecting
Spectrum is received, one is placed in the gas chamber side adjacent with the light source, for detecting fluorescence spectrum.
Optionally, the optical detector is photomultiplier tube.
Optionally, double spectrum gas mercury analytical equipments further include display module, the display module and the control
Module connection, the data sent for showing the control module.
According to another aspect of the present disclosure, it is also proposed that a kind of to carry out mercury analysis using above-mentioned double spectrum gas mercury analytical equipments
Method, the method includes：
Mercury measurement of concetration parameter is demarcated, wherein the mercury measurement of concetration parameter includes：Incident intensity has
The mercury concentration containing mercury gas of different mercury concentration and corresponding photoluminescence spectrum intensity；
Mercury measurement of concetration parameter based on calibration is surveyed using double spectrum gas mercury analytical equipments and atomic fluorescence method
Measure the mercury concentration estimation under test gas；
Mercury concentration estimation in the under test gas is corrected, the mercury concentration in the under test gas is obtained
Value.
Optionally, described the step of demarcating for mercury measurement of concetration parameter, includes：
Zero gas is injected in double spectrum gas mercury analytical equipments, measurement obtains the light intensity of the zero aspiration spectrum,
As incident intensity；
Injection first contains mercury gas containing mercury gas and second in double spectrum gas mercury analytical equipments, and measurement obtains pair
The photoluminescence spectrum intensity answered, wherein described first is different containing mercury concentration in mercury gas with second containing mercury gas.
Optionally, the mercury measurement of concetration parameter based on calibration, utilizes double spectrum gas mercury analytical equipments and original
The step of mercury concentration estimation in sub- fluorescent method measurement under test gas includes：
Under test gas is injected in double spectrum gas mercury analytical equipments；
The photoluminescence spectrum intensity of the under test gas is obtained using the atomic fluorescence method measurement；
The photoluminescence spectrum intensity of mercury measurement of concetration parameter and the under test gas based on calibration, is obtained using interpolation method
The estimated value of mercury concentration in the under test gas.
Optionally, the mercury concentration estimation under test gas is corrected, and is obtained in the under test gas
The step of mercury concentration value includes：
The absorption spectrum intensity of the under test gas is measured using Atomic Absorption Spectrometry；
Correction factor is obtained using the absorption spectrum Strength co-mputation of the incident intensity and the under test gas；
The mercury concentration estimation in the under test gas is corrected using the correction factor, is obtained described to be measured
Mercury concentration value in gas.
The disclosed technique scheme feature different with Pressurized sample digestion optical path using cold-vapour atomic absorption method, same
Two values of measurement simultaneously in gas chamber, finally by the influence of numerical value processing mode removal foreign gas.Disclosed technique scheme energy
Enough contents for accurately measuring mercury in flue gas, have many advantages, such as that structure is simple, measurement structure is accurate, can be in mercury content on-line checking
It is widely applied.
Detailed description of the invention
Fig. 1 is the structural schematic diagram according to double spectrum gas mercury analytical equipments of one embodiment of the disclosure；
Fig. 2 is the structural schematic diagram according to double spectrum gas mercury analytical equipments of another embodiment of the disclosure；
Fig. 3 is the Pressurized sample digestion schematic diagram according to one embodiment of the disclosure；
Fig. 4 is the flow chart according to double spectrum gas mercury analysis methods of one embodiment of the disclosure.
Specific embodiment
Hereinafter, the illustrative embodiments of the disclosure will be described in detail with reference to the attached drawings, so that those skilled in the art can
Easily realize them.In addition, for the sake of clarity, the portion unrelated with description illustrative embodiments is omitted in the accompanying drawings
Point.
In the disclosure, it should be appreciated that the term of " comprising " or " having " etc. is intended to refer to disclosed in this specification
Feature, number, step, behavior, the presence of component, part or combinations thereof, and be not intended to exclude other one or more features,
A possibility that number, step, behavior, component, part or combinations thereof exist or are added.
It also should be noted that in the absence of conflict, the feature in embodiment and embodiment in the disclosure
It can be combined with each other.The disclosure is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
In view of when in flue gas exist can be to the foreign gas that the measurement of mercury has an impact when, if using cold-vapour atomic absorption method
Measurement, the absorption due to foreign gas for ultraviolet light cause the ultraviolet light measured to weaken, finally make mercury measurement result inclined
Greatly；If being measured using Pressurized sample digestion, the ultraviolet light that mercury atom absorbs is since foreign gas subtracts the absorption of ultraviolet light
Few, the fluorescence of generation is also accordingly reduced, therefore causes mercury measurement result less than normal.The disclosure utilizes cold-vapour atomic absorption method and cold atom
The different feature of fluorescence method optical path, two values of measurement simultaneously, remove finally by numerical value processing mode in same gas chamber
The influence of foreign gas.
According to the one side of the disclosure, a kind of double spectrum gas mercury analytical equipments are proposed, as shown in Figure 1, double spectrum
Gas mercury analytical equipment includes：Light source, gas chamber, optical detector and control module, wherein：
The gas chamber is for storing tested gas；
The light source is placed in the side of the gas chamber, for issuing gas chamber described in measurement light-wave irradiation；
The optical detector be it is two or more, be placed in the not ipsilateral of the gas chamber, and connect with control module, be used for
Detection penetrates the measurement light wave of gas chamber, and will test data and be sent to the control module.
In one embodiment of the disclosure, the light source uses low pressure mercury lamp, generates the ultraviolet light of 253.7nm.
Wherein, the gas chamber is provided with air inlet and air outlet.
In one embodiment of the disclosure, the optical detector is two, and one is placed in the gas chamber opposite with the light source
Side, for detecting absorption spectrum, one is placed in the gas chamber side adjacent with the light source, for detecting fluorescence spectrum.
In one embodiment of the disclosure, the optical detector is photomultiplier tube.
In one embodiment of the disclosure, the control module can be micro-control unit (MCU).
In one embodiment of the disclosure, double spectrum gas mercury analytical equipments further include display module, the display
Module is connect with the control module, the data sent for showing the control module.
In one embodiment of the disclosure, the display module can show equipment for display screen etc..
Fig. 2 is according to the structural schematic diagram of double spectrum gas mercury analytical equipments of another embodiment of the disclosure, such as Fig. 2 institute
Show, identical as a upper embodiment, double spectrum gas mercury analytical equipments include：Light source, gas chamber, optical detector and control mould
Block, wherein：
The gas chamber is for storing tested gas；
The light source is placed in the side of the gas chamber, for issuing gas chamber described in measurement light-wave irradiation；
The optical detector be it is two or more, be placed in the not ipsilateral of the gas chamber, and connect with control module, be used for
Detection penetrates the measurement light wave of gas chamber, and will test data and be sent to the control module.
In this embodiment, the gas chamber is made of stainless steel as substrate, in addition, amalgam reacts in order to prevent,
The inner wall of the gas chamber is also coated with Teflon (Teflon).
The gas chamber is provided with air inlet and air outlet, and the air inlet and air outlet are connected separately with heat tracing conduit, institute
Air inlet is stated to connect by the use and pretreatment system, the gas outlet of heat tracing conduit connection mercury detection system by heat tracing conduit
Connect the subsequent processings measuring device such as flowmeter, aspiration pump.
The optical detector is photomultiplier tube (MPT).
The gas chamber is set there are three optical window, and the optical window is sealed using silica glass, wherein the gas
One end of room is equipped with the first optical window, low-pressure mercury light source is placed on the outside of first optical window, as test light
Source；The other end of the gas chamber is equipped with the second optical window, is placed with the first photomultiplier transit on the outside of second optical window
Pipe, for measuring atomic absorption spectrum；The side of the gas chamber is equipped with third optical window, institute on perpendicular to gas chamber direction
It states and is placed with the second photomultiplier tube on the outside of third optical window, for measuring atomic fluorescence spectrophotometry.
In addition, being needed between optical window and light source, photomultiplier tube in order to avoid the influence of other bias lights at three
Colour filter is set, guarantees that the measurement light for there was only 253.7nm passes through as far as possible.
The control module is micro-control unit (MCU).
Double spectrum gas mercury analytical equipments further include display module, and the display module and the control module connect
It connects, the data sent for showing the control module, the display module can show equipment for display screen etc..
Wherein, the length of the gas chamber is 20cm.
According to Beer law, there is such as following formula in the light intensity result measured using Atomic Absorption Spectrometry and incident intensity
Shown relationship：
Wherein, I1For the light intensity measured using Atomic Absorption Spectrometry；I0For incident intensity；εHgFor mercury unit length
With the absorption coefficient of unit concentration medium；cHgFor the concentration of mercury；L is the length in entire measurement light pond.
In actual flue gas other than mercury atom can absorb ultraviolet light, also other foreign gases can also absorb ultraviolet
Line, such as SO2、NOxDeng, therefore formula (1) can be revised as according to additive theory：
Wherein,Middle εiIndicate the absorption of i-th kind of foreign gas unit length and unit concentration medium in measurement gas
Coefficient, ciIndicate the concentration of i-th kind of foreign gas in measurement gas, N indicates the number of species of foreign gas in measurement gas, enablesThen formula (2) is represented by：
In addition, as shown in figure 3, for Pressurized sample digestion, any one substratum in gas chamber, there are following relationships：
Wherein, IxIndicate the fluorescence generated on a substratum in gas chamber, Ii' it is the light intensity absorbed on this substratum by mercury,
For fluorescence efficiency,
In formula, IiIndicate that the incident intensity on this substratum, x are starting distance of the substratum apart from light pond.
Since foreign gas is in addition to SO2Resonance fluorescence will not be all generated outside, therefore enterprising in entirely measurement length to formula (5)
Row integral, it is available：
Convolution (3) is available：
2.303(εHgcHg+ k)=ln (I0/I1) (7)
Formula (3) and (7) are substituted into formula (6) to obtain：
It is obtained by formula (8)：
When the foreign gas (calibrating gas) for not having absorptiometry light wave in flue gas, i.e. k=0, when, it can be obtained by formula (6)：
It willTaylor expansion is carried out, is obtained：
Due to the mercury content very little in flue gas, the higher order term in formula (11) can be ignored, therefore available：
Substitution formula (10) can obtain：
It can be obtained by formula (13)：
Substitution formula (9) can obtain：
DefinitionThen formula (15) can be rewritten as：
It can be obtained by formula (16), when measuring the mercury in flue gas using Pressurized sample digestion, can first assume to be free of in flue gas
Have an impact the gas of measurement, then calculates correction factor k by cold-vapour atomic absorption method again finally to remove the influence of other gases.
According to another aspect of the present disclosure, it proposes a kind of to carry out mercury analyses using the double spectrum gas mercury analytical equipments
Method, as shown in figure 4, the method includes the steps S401~S403：
In step S401, mercury measurement of concetration parameter is demarcated, wherein the mercury measurement of concetration parameter includes：
Incident intensity I0, mercury concentration containing mercury gas with different mercury concentration and corresponding photoluminescence spectrum intensity；
In step S402, the mercury measurement of concetration parameter based on calibration, using double spectrum gas mercury analytical equipments and
Atomic fluorescence method measures the mercury concentration estimation under test gas；
In step S403, the mercury concentration estimation in the under test gas is corrected, obtains the gas to be measured
Mercury concentration value in body.
In one embodiment of the disclosure, the step S401 includes step S4011~S4012：
In step S4011, zero gas is injected in double spectrum gas mercury analytical equipments, measurement obtains zero aspiration
The light intensity for receiving spectrum, as incident intensity I0, wherein zero gas refers to not mercurous and other impurities gas gas, such as
Pure nitrogen gas；
In step S4012, it is mercurous containing mercury gas and second that first is injected in double spectrum gas mercury analytical equipments
Gas, measurement obtain corresponding photoluminescence spectrum intensity, wherein described first containing mercury gas and second containing mercury concentration in mercury gas not
Together, the mercury concentration by described first containing mercury gas is expressed as ca, corresponding photoluminescence spectrum intensity is expressed as Ia, by described second
Mercury concentration containing mercury gas is expressed as cb, corresponding photoluminescence spectrum intensity is expressed as Ib。
In actual operation, it in order to improve measurement accuracy, needs every preset time, such as 1-2 weeks, just again for institute
Mercury measurement of concetration parameter is stated to be demarcated.
In one embodiment of the disclosure, the step S402 includes step S4021~S4023：
In step S4021, under test gas is injected in double spectrum gas mercury analytical equipments；
In step S4022, the photoluminescence spectrum intensity of the under test gas is obtained using the atomic fluorescence method measurement
I2；
In step S4023, the photoluminescence spectrum intensity I of mercury measurement of concetration parameter and the under test gas based on calibration2,
The estimated value of mercury concentration in the under test gas is obtained using interpolation method
In one embodiment of the disclosure, the interpolation method is linear interpolation method.
In one embodiment of the disclosure, the step S403 includes step S4031~S4033：
In step S4031, the absorption spectrum intensity I of the under test gas is measured using Atomic Absorption Spectrometry1；
In step S4032, the incident intensity I is utilized0With the absorption spectrum intensity I of the under test gas1It is calculated
Correction factor k：
In step S4033, school is carried out for the mercury concentration estimation in the under test gas using the correction factor
Just, the mercury concentration value in the under test gas is obtained：
According to the above technical scheme, disclosure comprehensive utilization many measuring methods accurately measure the content of mercury in flue gas, tool
Have the advantages that structure is simple, measurement structure is accurate.The double spectrum gas mercury analytical equipments of the disclosure can be used for coal-burning power plant's mercury content
The important component of on-line checking.
Particular embodiments described above has carried out further in detail the purpose of the disclosure, technical scheme and beneficial effects
Describe in detail it is bright, it is all it should be understood that be not limited to the disclosure the foregoing is merely the specific embodiment of the disclosure
Within the spirit and principle of the disclosure, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the disclosure
Within the scope of shield.
Claims (10)
1. a kind of double spectrum gas mercury analytical equipments, which is characterized in that double spectrum gas mercury analytical equipments include：Light source,
Gas chamber, optical detector and control module, wherein：
The gas chamber is for storing tested gas；
The light source is placed in the side of the gas chamber, for issuing gas chamber described in measurement light-wave irradiation；
The optical detector be it is two or more, the not ipsilateral of the gas chamber is placed in, and connect with control module, for detecting
Through the measurement light wave of gas chamber, and it will test data and be sent to the control module.
2. double spectrum gas mercury analytical equipments according to claim 1, which is characterized in that the light source is low pressure mercury lamp.
3. double spectrum gas mercury analytical equipments according to claim 1, which is characterized in that the light source generates 253.7nm
Ultraviolet light.
4. double spectrum gas mercury analytical equipments according to claim 1, which is characterized in that the optical detector is two,
One is placed in the gas chamber side opposite with the light source, and for detecting absorption spectrum, one is placed in the gas adjacent with the light source
Room side, for detecting fluorescence spectrum.
5. double spectrum gas mercury analytical equipments according to claim 1, which is characterized in that the optical detector is photoelectricity times
Increase pipe.
6. double spectrum gas mercury analytical equipments according to claim 1, which is characterized in that double spectrum gas mercury analyses
Device further includes display module, and the display module is connect with the control module, for showing what the control module was sent
Data.
7. a kind of method for carrying out mercury analysis using double spectrum gas mercury analytical equipments of any of claims 1-6,
It is characterized in that, the method includes：
Mercury measurement of concetration parameter is demarcated, wherein the mercury measurement of concetration parameter includes：Incident intensity has difference
The mercury concentration containing mercury gas of mercury concentration and corresponding photoluminescence spectrum intensity；
Mercury measurement of concetration parameter based on calibration, using double spectrum gas mercury analytical equipments and atomic fluorescence method measurement to
Survey the mercury concentration estimation in gas；
Mercury concentration estimation in the under test gas is corrected, the mercury concentration value in the under test gas is obtained.
8. the method according to the description of claim 7 is characterized in that described the step of being demarcated for mercury measurement of concetration parameter
Including：
Zero gas is injected in double spectrum gas mercury analytical equipments, measurement obtains the light intensity of the zero aspiration spectrum, as
Incident intensity；
Injection first contains mercury gas containing mercury gas and second in double spectrum gas mercury analytical equipments, and measurement obtains corresponding
Photoluminescence spectrum intensity, wherein described first is different containing mercury concentration in mercury gas with second containing mercury gas.
9. the method according to the description of claim 7 is characterized in that the mercury measurement of concetration parameter based on calibration, utilizes institute
The step of stating the mercury concentration estimation in double spectrum gas mercury analytical equipments and atomic fluorescence method measurement under test gas include：
Under test gas is injected in double spectrum gas mercury analytical equipments；
The photoluminescence spectrum intensity of the under test gas is obtained using the atomic fluorescence method measurement；
The photoluminescence spectrum intensity of mercury measurement of concetration parameter and the under test gas based on calibration is obtained described using interpolation method
The estimated value of mercury concentration under test gas.
10. the method according to the description of claim 7 is characterized in that the mercury concentration estimation under test gas into
Row correction, the step of obtaining the mercury concentration value in the under test gas include：
The absorption spectrum intensity of the under test gas is measured using Atomic Absorption Spectrometry；
Correction factor is obtained using the absorption spectrum Strength co-mputation of the incident intensity and the under test gas；
The mercury concentration estimation in the under test gas is corrected using the correction factor, obtains the under test gas
In mercury concentration value.
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