CN108896519B - Double-spectrum flue gas mercury analysis device and corresponding method - Google Patents
Double-spectrum flue gas mercury analysis device and corresponding method Download PDFInfo
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- CN108896519B CN108896519B CN201810488995.9A CN201810488995A CN108896519B CN 108896519 B CN108896519 B CN 108896519B CN 201810488995 A CN201810488995 A CN 201810488995A CN 108896519 B CN108896519 B CN 108896519B
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 144
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000003546 flue gas Substances 0.000 title claims abstract description 52
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- 238000010521 absorption reaction Methods 0.000 description 10
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- 229910000497 Amalgam Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
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- 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 utility model discloses a two spectrum flue gas mercury analytical equipment and corresponding method, two spectrum flue gas mercury analytical equipment includes: light source, gas chamber, light detector and control module, wherein: the air chamber is used for storing the gas to be detected; the light source is arranged on one side of the air chamber and used for emitting measuring light waves to irradiate the air chamber; the optical detectors are arranged on different sides of the air chamber, connected with the control module, and used for detecting the measuring light waves penetrating through the air chamber and sending the detection data to the control module. The technical scheme disclosed by the invention comprehensively utilizes various measuring methods, can accurately measure the mercury content in the flue gas, has the advantages of simple structure, accurate measuring structure and the like, and can be widely applied to the on-line detection of the mercury content.
Description
Technical Field
The disclosure relates to the technical field of analytical instruments, in particular to a double-spectrum flue gas mercury analysis device and a corresponding method.
Background
Due to the rapid development of industry, anthropogenic mobile mercury emissions are becoming a major source of atmospheric mercury in the environment. Coal belongs to one of energy and mineral resources and is an important substance for economic and social development all over the world. The industry demand globally burns large quantities of coal with a greatly increasing trend each year, with mercury released from the burning coal accounting for a significant proportion of that released by human activity.
In the 10 th year 2013, the "mercury treaty outcrossing conference" sponsored by the environmental planning agency of the united nations was declared to pass the water guarantee convention for controlling and reducing global mercury emissions in japan bear city, and the representatives of 87 countries and regions including china signed the convention together, marking that the reduction of mercury pollution is a first step in the global hands-free process. The convention considers small gold mines and coal-fired power plants as the largest sources of mercury pollution. Therefore, real-time monitoring of mercury in flue gas becomes a necessary means.
In thermal power plants, typical emission concentrations of mercury are typically only 0.01ppm, compared to SO2Or NOXFor example, the concentration is 4-5 orders of magnitude lower. Therefore, the difficulty of mercury online monitoring is high, and the existing flue gas mercury monitoring technology mainly adopts a flue to extract sampling gas, and obtains the concentration of mercury through an optical monitoring method after pretreatment. Different optical monitoring methods have a crucial influence on the construction and measurement accuracy of an overall system, so that the research of the optical monitoring method is the core of an element mercury online monitoring technology.
Currently, the optical monitoring methods for mercury mainly include Cold Vapor Atomic Absorption Spectroscopy (CVAAS), Cold Vapor Atomic Fluorescence Spectroscopy (CVAFS), Atomic Emission Spectroscopy (AES), X-ray fluorescence spectroscopy (X-ray fluorescence spectroscopy), and Ultraviolet differential absorption spectroscopy (UV-DOAS). At present, the most mature method is cold atomic absorption spectrometry and cold steam atomic fluorescence spectrometry, American Saimer company provides a test device adopting the cold atomic fluorescence spectrometry, and Germany MI, Japan Kyoto electronics and China Hangzhou spotlight provide a test device based on the cold atomic absorption spectrometry.
The general optical measurement method utilizes the characteristic that mercury atoms have strong absorption effect on 253.7nm ultraviolet rays, and obtains the concentration of mercury by measuring the change of the ultraviolet rays passing through mercury-containing flue gas. However, since the coal-fired flue gas contains a large amount of impurity gases such as sulfur dioxide and nitric oxide, which also have a strong absorption effect on ultraviolet rays, the measurement of the mercury content is generally performed after desulfurization and denitration treatment. The process can remove most of gases such as sulfur dioxide, nitric oxide and the like in the flue gas. The above method, except for the ultraviolet differential absorption spectrum, assumes that it does not contain a gas capable of absorbing ultraviolet rays. The ultraviolet difference mode needs two independent gas chambers and a measurement system, and if the reference gas is standard gas, the influence of impurity gas cannot be removed from the measurement result; if the reference gas adopts flue gas with mercury removed, the mercury cannot be completely removed, and meanwhile impurity gases can be removed, so that the reference is inaccurate.
Disclosure of Invention
In order to solve the problems existing in the prior art, the atomic absorption method and the atomic fluorescence method are utilized to measure the characteristics of different light paths, two values are measured in the same gas chamber at the same time, and the influence of impurity gas is removed in a numerical processing mode.
According to an aspect of the present disclosure, a dual-spectrum flue gas mercury analysis device is provided, the dual-spectrum flue gas mercury analysis device comprising: light source, gas chamber, light detector and control module, wherein:
the air chamber is used for storing the gas to be detected;
the light source is arranged on one side of the air chamber and used for emitting measuring light waves to irradiate the air chamber;
the optical detectors are arranged on different sides of the air chamber, connected with the control module, and used for detecting the measuring light waves penetrating through the air chamber and sending the detection data to the control module.
Optionally, the light source is a low pressure mercury lamp.
Optionally, the light source generates 253.7nm ultraviolet light.
Optionally, the number of the optical detectors is two, one is disposed on one side of the gas chamber opposite to the light source and is used for detecting an absorption spectrum, and the other is disposed on one side of the gas chamber adjacent to the light source and is used for detecting a fluorescence spectrum.
Optionally, the photodetector is a photomultiplier tube.
Optionally, the dual-spectrum flue gas mercury analysis device further comprises a display module, and the display module is connected with the control module and used for displaying data sent by the control module.
According to another aspect of the present disclosure, there is also provided a method for mercury analysis using the above dual-spectrum flue gas mercury analysis apparatus, the method comprising:
calibrating mercury concentration measurement parameters, wherein the mercury concentration measurement parameters comprise: incident light intensity, mercury concentration of mercury-containing gas with different mercury concentrations and corresponding fluorescence spectrum intensity;
based on the calibrated mercury concentration measurement parameters, measuring the mercury concentration estimation value in the gas to be measured by using the double-spectrum flue gas mercury analysis device and the atomic fluorescence method;
and correcting the estimated value of the mercury concentration in the gas to be detected to obtain the mercury concentration value in the gas to be detected.
Optionally, the step of calibrating the mercury concentration measurement parameter comprises:
injecting zero gas into the double-spectrum flue gas mercury analysis device, and measuring to obtain light intensity of the zero gas absorption spectrum as incident light intensity;
and injecting a first mercury-containing gas and a second mercury-containing gas into the double-spectrum flue gas mercury analysis device, and measuring to obtain corresponding fluorescence spectrum intensity, wherein the mercury concentration in the first mercury-containing gas is different from that in the second mercury-containing gas.
Optionally, the step of measuring the estimated mercury concentration value in the gas to be measured by using the dual-spectrum flue gas mercury analysis device and the atomic fluorescence method based on the calibrated mercury concentration measurement parameter includes:
injecting gas to be detected into the double-spectrum flue gas mercury analysis device;
measuring the fluorescence spectrum intensity of the gas to be measured by using the atomic fluorescence method;
and obtaining an estimated value of the mercury concentration in the gas to be detected by utilizing an interpolation method based on the calibrated mercury concentration measurement parameter and the fluorescence spectrum intensity of the gas to be detected.
Optionally, the step of correcting the estimated value of the mercury concentration in the gas to be detected to obtain the value of the mercury concentration in the gas to be detected includes:
measuring the absorption spectrum intensity of the gas to be measured by using an atomic absorption spectrometry;
calculating to obtain a correction factor by using the incident light intensity and the absorption spectrum intensity of the gas to be detected;
and correcting the mercury concentration estimation value in the gas to be detected by using the correction factor to obtain the mercury concentration value in the gas to be detected.
The technical scheme disclosed by the invention utilizes the characteristics of different light paths measured by a cold atom absorption method and a cold atom fluorescence method, two values are simultaneously measured in the same air chamber, and finally the influence of impurity gas is removed by a numerical processing mode. The technical scheme disclosed by the invention can accurately measure the mercury content in the flue gas, has the advantages of simple structure, accurate measurement structure and the like, and can be widely applied to the on-line detection of the mercury content.
Drawings
Fig. 1 is a schematic structural diagram of a dual-spectrum flue gas mercury analysis apparatus according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a dual-spectrum flue gas mercury analysis apparatus according to another embodiment of the present disclosure;
FIG. 3 is a schematic diagram of cold atom fluorescence according to an embodiment of the present disclosure;
fig. 4 is a flow chart of a dual-spectrum flue gas mercury analysis method according to an embodiment of the present disclosure.
Detailed Description
Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. Also, for the sake of clarity, parts not relevant to the description of the exemplary embodiments are omitted in the drawings.
In the present disclosure, it is to be understood that terms such as "including" or "having," etc., are intended to indicate the presence of the disclosed features, numbers, steps, behaviors, components, parts, or combinations thereof, and are not intended to preclude the possibility that one or more other features, numbers, steps, behaviors, components, parts, or combinations thereof may be present or added.
It should be further noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Considering that when impurity gas which can affect the measurement of mercury exists in the flue gas, if the cold atomic absorption method is used for measurement, the measured ultraviolet ray is weakened due to the absorption of the impurity gas to the ultraviolet ray, and finally the mercury measurement result is larger; when measured by cold atomic fluorescence, the ultraviolet light absorbed by mercury atoms is reduced by the absorption of the ultraviolet light by the impurity gas, and the generated fluorescence is also reduced, thereby resulting in a smaller mercury measurement result. The method utilizes the characteristics of a cold atom absorption method and a cold atom fluorescence method for measuring different light paths, simultaneously measures two values in the same air chamber, and finally removes the influence of impurity gases through a numerical processing mode.
According to an aspect of the present disclosure, a dual-spectrum flue gas mercury analysis device is provided, as shown in fig. 1, the dual-spectrum flue gas mercury analysis device includes: light source, gas chamber, light detector and control module, wherein:
the air chamber is used for storing the gas to be detected;
the light source is arranged on one side of the air chamber and used for emitting measuring light waves to irradiate the air chamber;
the optical detectors are arranged on different sides of the air chamber, connected with the control module, and used for detecting the measuring light waves penetrating through the air chamber and sending the detection data to the control module.
In one embodiment of the present disclosure, the light source is a low-pressure mercury lamp, and generates 253.7nm ultraviolet light.
Wherein the air chamber is provided with an air inlet and an air outlet.
In one embodiment of the present disclosure, the number of the light detectors is two, one is disposed on a side of the gas chamber opposite to the light source for detecting the absorption spectrum, and the other is disposed on a side of the gas chamber adjacent to the light source for detecting the fluorescence spectrum.
In an embodiment of the present disclosure, the photodetector is a photomultiplier tube.
In an embodiment of the present disclosure, the control module may be a Micro Control Unit (MCU).
In an embodiment of the present disclosure, the dual-spectrum flue gas mercury analysis device further includes a display module, and the display module is connected to the control module and is configured to display data sent by the control module.
In an embodiment of the present disclosure, the display module may be a display device such as a display screen.
Fig. 2 is a schematic structural diagram of a dual-spectrum flue gas mercury analysis device according to another embodiment of the present disclosure, and as shown in fig. 2, the dual-spectrum flue gas mercury analysis device includes: light source, gas chamber, light detector and control module, wherein:
the air chamber is used for storing the gas to be detected;
the light source is arranged on one side of the air chamber and used for emitting measuring light waves to irradiate the air chamber;
the optical detectors are arranged on different sides of the air chamber, connected with the control module, and used for detecting the measuring light waves penetrating through the air chamber and sending the detection data to the control module.
In this example, the gas cell was made of stainless steel as a base material, and in addition, Teflon (Teflon) was further plated on the inner wall of the gas cell in order to prevent the amalgam reaction.
The gas chamber is provided with an air inlet and an air outlet, the air inlet and the air outlet are respectively connected with a heat tracing guide pipe, the air inlet is connected with a mercury detection system through the heat tracing guide pipe, the air outlet is connected with a flow meter, an air pump and other subsequent treatment measuring devices through the heat tracing guide pipe.
The light detector is a photomultiplier tube (MPT).
The gas chamber is provided with three optical windows which are sealed by silica glass, wherein one end of the gas chamber is provided with a first optical window, and a low-pressure mercury lamp light source is placed on the outer side of the first optical window and used as a test light source; a second optical window is arranged at the other end of the gas chamber, and a first photomultiplier is arranged on the outer side of the second optical window and used for measuring atomic absorption spectrum; and a third optical window is arranged on one side of the air chamber in the direction perpendicular to the air chamber, and a second photomultiplier is placed on the outer side of the third optical window and used for measuring the atomic fluorescence spectrum.
In addition, in order to avoid the influence of other background light, color filters are required to be arranged among the three optical windows, the light source and the photomultiplier tube, and only 253.7nm of measuring light is ensured to pass through as much as possible.
The control module is a Micro Control Unit (MCU).
The double-spectrum flue gas mercury analysis device further comprises a display module, wherein the display module is connected with the control module and used for displaying data sent by the control module, and the display module can be a display screen and other display equipment.
Wherein the length of the air chamber is 20 cm.
According to beer's law, the light intensity measured by atomic absorption spectrometry has a relationship with the incident light intensity as shown in the following formula:
wherein, I1The light intensity is measured by using an atomic absorption spectrometry; i is0Is the incident light intensity; epsilonHgThe absorption coefficient of the medium is mercury unit length and unit concentration; c. CHgIs the concentration of mercury; and L is the length of the whole measuring light cell.
In addition to mercury atoms absorbing ultraviolet radiation in actual flue gas, there are other contaminant gases that also absorb ultraviolet radiation, such as SO2、NOxEtc., and thus equation (1) can be modified according to additive principles:
wherein the content of the first and second substances,
middle epsiloniIndicating the i-th species in the measurement gasAbsorption coefficient of impurity gas per unit length and per unit concentration of medium, ciIndicating the concentration of the i-th impurity gas in the measurement gas, N indicating the number of types of impurity gases in the measurement gas, such that
Then equation (2) can be expressed as:
as shown in fig. 3, in the cold atom fluorescence method, the following relationship exists for any small layer in the gas chamber:
wherein, IxIndicating the fluorescence generated on a small layer in the gas cell, Ii' is the intensity of the light absorbed by the mercury on this small layer,
in order to be efficient in fluorescence,
in the formula IiRepresenting the intensity of the incident light on this small layer, x being the starting distance of the small layer from the cell.
Since the impurity gas is except SO2No resonant fluorescence is produced, so integrating equation (5) over the entire measurement length yields:
the combination of formula (3) gives:
2.303(εHgcHg+k)＝ln(I0/I1) (7)
substituting formulae (3) and (7) for formula (6) to obtain:
obtained from formula (8):
when there is no impurity gas (standard gas) in the flue gas that absorbs the measurement light wave, i.e., k is 0, it can be obtained from equation (6):
will be provided with
Taylor expansion was performed to obtain:
since the mercury content in the flue gas is small, the higher order term in equation (11) is negligible, and therefore yields:
can be substituted by the formula (10):
from formula (13):
can be substituted by the formula (9):
definition of
Equation (15) can be rewritten as:
when mercury in flue gas is measured by using the cold atomic fluorescence method, it can be assumed that the flue gas does not contain gas which affects measurement, and then the cold atomic absorption method is used to calculate the correction factor k to finally remove the influence of other gases.
According to another aspect of the present disclosure, a method for mercury analysis by using the dual-spectrum flue gas mercury analysis device is provided, as shown in fig. 4, the method includes steps S401 to S403:
in step S401, calibration is performed on the mercury concentration measurement parameters, where the mercury concentration measurement parameters include: incident light intensity I0Mercury concentrations and corresponding fluorescence spectrum intensities of mercury-containing gases having different mercury concentrations;
in step S402, based on the calibrated mercury concentration measurement parameter, measuring a mercury concentration estimation value in the gas to be measured by using the dual-spectrum flue gas mercury analysis device and the atomic fluorescence method;
in step S403, the estimated value of the mercury concentration in the gas to be detected is corrected to obtain the mercury concentration value in the gas to be detected.
In an embodiment of the present disclosure, the step S401 includes steps S4011 to S4012:
in step S4011, a zero gas is injected into the dual-spectrum flue gas mercury analyzer, and the light intensity of the zero gas absorption spectrum is measured and obtained as the incident light intensity I0Wherein, the gas is freeGases of mercury and other impurity gases, such as pure nitrogen;
in step S4012, a first mercury-containing gas and a second mercury-containing gas are injected into the dual-spectrum flue gas mercury analysis device, and the corresponding fluorescence spectrum intensities are obtained through measurement, where the mercury concentrations in the first mercury-containing gas and the second mercury-containing gas are different, and the mercury concentration of the first mercury-containing gas is represented as caThe corresponding fluorescence spectrum intensity is represented as IaExpressing the mercury concentration of the second mercury-containing gas as cbThe corresponding fluorescence spectrum intensity is represented as Ib。
In practice, in order to improve the measurement accuracy, the mercury concentration measurement parameter needs to be calibrated again at preset time intervals, such as 1-2 weeks.
In an embodiment of the present disclosure, the step S402 includes steps S4021 to S4023:
in step S4021, injecting a gas to be measured into the dual-spectrum flue gas mercury analysis apparatus;
in step S4022, the fluorescence spectrum intensity I of the gas to be measured is measured by the atomic fluorescence method2；
In step S4023, based on the calibrated mercury concentration measurement parameter and the fluorescence spectrum intensity I of the gas to be measured2Obtaining the estimated value of the mercury concentration in the gas to be detected by utilizing an interpolation method
In an embodiment of the present disclosure, the interpolation method is a linear interpolation method.
In an embodiment of the present disclosure, the step S403 includes steps S4031 to S4033:
in step S4031, the absorption spectrum intensity I of the gas to be measured is measured by atomic absorption spectroscopy1；
In step S4032, the incident light intensity I is used0And the absorption spectrum intensity I of the gas to be measured1Calculating to obtain a correction factor k:
in step S4033, the correction factor is used to correct the estimated mercury concentration value in the gas to be measured, so as to obtain a mercury concentration value in the gas to be measured:
according to the technical scheme, the method comprehensively utilizes various measuring methods to accurately measure the content of mercury in the flue gas, and has the advantages of simple structure, accurate measuring structure and the like. The double-spectrum flue gas mercury analysis device can be used for important components of on-line detection of mercury content in a coal-fired power plant.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (7)
1. A method of dual-spectrum flue gas mercury analysis, using a dual-spectrum flue gas mercury analysis apparatus comprising: light source, gas chamber, light detector and control module, wherein:
the air chamber is used for storing the gas to be detected;
the light source is arranged on one side of the air chamber and used for emitting measuring light waves to irradiate the air chamber;
the two optical detectors are arranged on one side of the air chamber opposite to the light source and used for detecting an absorption spectrum, and the other one is arranged on one side of the air chamber adjacent to the light source and used for detecting a fluorescence spectrum, is connected with the control module and sends detection data to the control module;
the method comprises the following steps:
calibrating mercury concentration measurement parameters, wherein the mercury concentration measurement parameters comprise: incident light intensity, mercury concentration of mercury-containing gas with different mercury concentrations and corresponding fluorescence spectrum intensity;
based on calibrated mercury concentration measurement parameters, the mercury concentration estimation value in the gas to be measured is measured by using the double-spectrum flue gas mercury analysis device and the atomic fluorescence method
；
Correcting the mercury concentration estimation value in the gas to be detected to obtain a mercury concentration value in the gas to be detected, wherein the correction comprises the following steps: measuring the absorption spectrum intensity I of the gas to be measured by using atomic absorption spectrometry1(ii) a Using said incident light intensity I0And the absorption spectrum intensity I of the gas to be measured1And calculating to obtain a correction factor k, wherein the calculation formula is as follows:
(ii) a Correcting the mercury concentration estimation value in the gas to be detected by using the correction factor to obtain a mercury concentration value c in the gas to be detectedHgThe calculation formula is as follows:
。
2. the method of claim 1, wherein the step of calibrating the mercury concentration measurement parameter comprises:
injecting zero gas into the double-spectrum flue gas mercury analysis device, and measuring to obtain light intensity of the zero gas absorption spectrum as incident light intensity;
and injecting a first mercury-containing gas and a second mercury-containing gas into the double-spectrum flue gas mercury analysis device, and measuring to obtain corresponding fluorescence spectrum intensity, wherein the mercury concentration in the first mercury-containing gas is different from that in the second mercury-containing gas.
3. The method of claim 1, wherein the step of measuring the estimated mercury concentration value in the gas to be measured by using the dual-spectrum flue gas mercury analysis device and the atomic fluorescence method based on the calibrated mercury concentration measurement parameters comprises:
injecting gas to be detected into the double-spectrum flue gas mercury analysis device;
measuring the fluorescence spectrum intensity of the gas to be measured by using the atomic fluorescence method;
and obtaining an estimated value of the mercury concentration in the gas to be detected by utilizing an interpolation method based on the calibrated mercury concentration measurement parameter and the fluorescence spectrum intensity of the gas to be detected.
4. The method of claim 1, wherein the light source is a low pressure mercury lamp.
5. The method of claim 1, wherein the light source generates 253.7nm ultraviolet light.
6. The method of claim 1, wherein the light detector is a photomultiplier tube.
7. The method of claim 1, wherein the dual-spectrum flue gas mercury analysis device further comprises a display module connected to the control module for displaying data sent by the control module.
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Application publication date: 20181127 Assignee: Jiangsu Nangong Testing Co.,Ltd. Assignor: NANJING INSTITUTE OF TECHNOLOGY Contract record no.: X2024980001802 Denomination of invention: Dual spectral mercury analysis device for flue gas and corresponding methods Granted publication date: 20210427 License type: Common License Record date: 20240202 |