CN116660467A - Mercury concentration monitoring device for flue gas dilution pretreatment - Google Patents

Mercury concentration monitoring device for flue gas dilution pretreatment Download PDF

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Publication number
CN116660467A
CN116660467A CN202310596947.2A CN202310596947A CN116660467A CN 116660467 A CN116660467 A CN 116660467A CN 202310596947 A CN202310596947 A CN 202310596947A CN 116660467 A CN116660467 A CN 116660467A
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CN
China
Prior art keywords
dilution
mercury
gas
flue gas
filter
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Pending
Application number
CN202310596947.2A
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Chinese (zh)
Inventor
韩立鹏
钟犁
余长开
张茂龙
王万杰
陈飞云
苏林
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Beijing Huaneng Changjiang Environmental Protection Technology Research Institute Co Ltd
Huaneng Chongqing Luohuang Power Generation Co Ltd
Original Assignee
Beijing Huaneng Changjiang Environmental Protection Technology Research Institute Co Ltd
Huaneng Chongqing Luohuang Power Generation Co Ltd
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Application filed by Beijing Huaneng Changjiang Environmental Protection Technology Research Institute Co Ltd, Huaneng Chongqing Luohuang Power Generation Co Ltd filed Critical Beijing Huaneng Changjiang Environmental Protection Technology Research Institute Co Ltd
Priority to CN202310596947.2A priority Critical patent/CN116660467A/en
Publication of CN116660467A publication Critical patent/CN116660467A/en
Pending legal-status Critical Current

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    • 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—Specially adapted to detect a particular component
    • G01N33/0045—Specially adapted to detect a particular component for Hg
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
    • G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
    • G01N1/2214—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling by sorption
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2247—Sampling from a flowing stream of gas
    • G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
    • 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
    • G01N1/34—Purifying; Cleaning
    • 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
    • G01N1/38—Diluting, dispersing or mixing samples
    • 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
    • G01N33/0011—Sample conditioning
    • G01N33/0014—Sample conditioning by eliminating a gas
    • 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
    • G01N33/0011—Sample conditioning
    • G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure, temperature
    • 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
    • G01N33/0011—Sample conditioning
    • G01N33/0018—Sample conditioning by diluting a gas
    • 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
    • G01N1/38—Diluting, dispersing or mixing samples
    • G01N2001/386—Other diluting or mixing processes
    • G01N2001/387—Other diluting or mixing processes mixing by blowing a gas, bubbling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention discloses a flue gas dilution pretreatment mercury concentration monitoring device, which comprises a sampling gun, a filter cavity, a filter, a dilution unit, a conversion unit and a mercury analyzer, wherein the filter is positioned in the filter cavity and is used for filtering sampling flue gas sampled by the sampling gun, a sample gas inlet of the dilution unit is communicated with a filter gas outlet of the filter, a diluted sample gas outlet of the dilution unit is communicated with a diluted sample gas inlet of the conversion unit, the conversion unit comprises an elemental mercury pipeline and a divalent mercury pipeline which are connected in parallel, an air outlet end of the elemental mercury pipeline and an air outlet end of the divalent mercury pipeline are both communicated with a detection inlet of the mercury analyzer, a divalent mercury remover is arranged on the elemental mercury pipeline, a reformer is arranged on the divalent mercury pipeline and is used for converting divalent mercury into elemental mercury, and the length of a flue gas circulation path between the sampling gun and the conversion unit is less than 30 meters. The flue gas dilution pretreatment mercury concentration monitoring device provided by the invention directly converts bivalent mercury into elemental mercury near a flue, so that the accuracy of a measurement result is ensured.

Description

Mercury concentration monitoring device for flue gas dilution pretreatment
Technical Field
The invention relates to the technical field of mercury analysis, in particular to a device for monitoring the concentration of mercury in flue gas dilution pretreatment.
Background
Mercury pollution is extremely toxic, persistent, global and bioaccumulative. The mercury in the coal-fired flue gas mainly exists in three forms of gaseous zero-valent mercury, gaseous divalent ion mercury and granular mercury. For on-line monitoring of mercury emission, it is critical to accurately grasp the change rule of the emission concentration of the mercury of the fixed source in real time, so as to accurately obtain the total emission measurement amount of the mercury, but the concentration of the mercury of the fixed source is far lower than other conventional pollutants, and forms of gaseous elemental mercury, gaseous bivalent mercury and the like exist. In the related art, only gaseous elemental mercury can be measured by using a mercury analyzer, and bivalent mercury is easy to be adsorbed on a pipeline in the process of sample gas transmission, so that a test result is distorted.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. For this reason, the embodiment of the invention provides a flue gas dilution pretreatment mercury concentration monitoring device.
The flue gas dilution pretreatment mercury concentration monitoring device comprises a sampling gun, a filter cavity, a filter, a dilution unit, a conversion unit and a mercury analyzer, wherein a sampling end of the sampling gun stretches into a flue to sample flue gas, a gas discharging end of the sampling gun is communicated with the filter cavity, the filter is positioned in the filter cavity to filter the sampled flue gas, a sample gas inlet of the dilution unit is communicated with a filtered gas outlet of the filter, a diluted sample gas outlet of the dilution unit is communicated with a diluted sample gas inlet of the conversion unit, the dilution unit is used for diluting the filtered sampled flue gas according to a preset proportion, the conversion unit comprises an elemental mercury pipeline and a bivalent mercury pipeline which are connected in parallel, gas discharging ends of the elemental mercury pipeline and the bivalent mercury pipeline are both communicated with a detection inlet of the mercury analyzer, a bivalent mercury remover is arranged on the elemental mercury pipeline, a conversion furnace is arranged on the bivalent mercury pipeline and is used for converting bivalent mercury into elemental mercury, and the length of a flue gas circulation path between the sampling gun and the conversion unit is less than 30 m.
The flue gas dilution pretreatment mercury concentration monitoring device provided by the embodiment of the invention can directly convert bivalent mercury into zero-valent mercury at a site discharge chimney, so that the measurement accuracy is ensured. In the related art, the discharge chimney is connected with the sample analysis chamber through a long heat preservation pipeline (generally more than 30 meters), and if the pipeline is not well preserved, bivalent mercury in the flue gas is easily adsorbed on the pipeline, so that the test result is distorted.
In some embodiments, the filter is cylindrical, a filter screen is arranged on the peripheral wall of the filter, the end part of the filter is provided with the filtered gas outlet, and the sampled flue gas passes through the filter screen from outside to inside for filtering.
In some embodiments, the flue gas dilution pretreatment mercury concentration monitoring device further comprises a lance tube, an air outlet of the lance tube is communicated with the filtered air outlet, and a back-flushing valve is arranged on the lance tube.
In some embodiments, the dilution unit includes a precision filter, a conical tube, a siphon mouth, a dilution air pipe, and a dilution air valve, where the precision filter is disposed at a sample air inlet of the dilution unit, the conical tube is disposed at a downstream of the precision filter and has a cross section gradually reduced along a smoke flow direction, the outlet of the conical tube and the outlet of the dilution air pipe are both communicated with the siphon mouth, the downstream of the siphon mouth is provided with the diluted sample air outlet, and the dilution air valve is disposed on the dilution air pipe and is used for controlling a flow rate of the dilution air.
In some embodiments, the flue gas dilution pretreatment mercury concentration monitoring device further comprises a jet unit, wherein the jet unit is communicated with the filtered gas outlet and is positioned at the downstream of the dilution unit, and the jet unit samples the flue gas by utilizing an injection principle.
In some embodiments, the jet unit comprises a jet gas inlet, a jet gas valve arranged at the jet gas inlet, a sample gas injection port and an excessive flue gas outlet, wherein the sample gas injection port is communicated with the filtered gas outlet and the jet gas inlet, and the excessive flue gas outlet is communicated with the sample gas injection port and is used for discharging excessive flue gas.
In some embodiments, the flue gas dilution pretreatment mercury concentration monitoring device further comprises a constant temperature cabinet and a heating block, wherein the filter cavity, the filter and the dilution unit are all positioned in the constant temperature cabinet, and the heating block is arranged on the outer side or the inner side of the constant temperature cabinet and used for heating so as to maintain the temperature in the constant temperature cabinet.
In some embodiments, the flue gas dilution pretreatment mercury concentration monitoring device comprises a support disposed adjacent to the chimney, the thermostat housing is mounted on the support, and the conversion unit is mounted on the support and below the thermostat housing.
In some embodiments, the flue gas dilution pretreatment mercury concentration monitoring device further comprises an air compressor, an outlet of which is in communication with the dilution gas inlet of the dilution unit, and a gas purifier provided between the air compressor and the dilution gas inlet of the dilution unit for purification of the gas.
In some embodiments, the length of the flue gas flow path between the sampling gun to the conversion unit is less than 10 meters.
Drawings
Fig. 1 is a schematic structural diagram of a flue gas dilution pretreatment mercury concentration monitoring device provided by an embodiment of the invention.
Reference numerals:
the device comprises a sampling gun 1, a filter cavity 2, a filter 3, a filtered gas outlet 31, a flue 32, a dilution unit 4, a diluted sample gas outlet 41, a precision filter 42, a conical tube 43, a siphon port 44, a dilution gas pipe 45, a dilution gas valve 46, a conversion unit 5, a diluted sample gas inlet 51, a bivalent mercury remover 52, a conversion furnace 53, a mercury analyzer 6, a chimney 7, a blowing pipe 8, a blowback valve 81, a jet unit 9, a jet gas valve 91, a sample gas injection port 92, an excess flue gas outlet 93, a constant-temperature cabinet 101, a heating block 102, a bracket 103, an air compressor 104 and a gas purifier 105.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The following describes a flue gas dilution pretreatment mercury concentration monitoring device provided by an embodiment of the present invention according to fig. 1, and the flue gas dilution pretreatment mercury concentration monitoring device includes a sampling gun 1, a filter cavity 2, a filter 3, a dilution unit 4, a conversion unit 5, and a mercury analyzer 6.
The sampling end of the sampling gun 1 stretches into a chimney 7 to be sampled for sampling smoke, the air discharging end of the sampling gun 1 is communicated with the filter cavity 2, and the filter 3 is positioned in the filter cavity 2 for filtering the sampled smoke taken by the sampling gun 1 and filtering impurities in the sampled smoke.
The dilution unit 4 is used for diluting the filtered sampling smoke according to a preset proportion. The sample gas inlet of the dilution unit 4 communicates with the filtered gas outlet 31 of the filter 3, and the diluted sample gas outlet 41 of the dilution unit 4 communicates with the diluted sample gas inlet 51 of the conversion unit 5. The filtered sampling flue gas enters the dilution unit 4 from the sample gas inlet of the dilution unit 4, is diluted by the dilution unit 4 according to a preset proportion and becomes diluted sample gas, and the diluted sample gas enters the conversion unit 5 for conversion through the diluted sample gas outlet 41 and the diluted sample gas inlet 51 of the conversion unit 5.
The conversion unit 5 comprises an elemental mercury pipeline and a bivalent mercury pipeline which are connected in parallel, and the air inlet ends of the elemental mercury pipeline and the bivalent mercury pipeline are communicated with the dilution sample air inlet 51. The outlet ends of the elemental mercury pipeline and the bivalent mercury pipeline are communicated with the detection inlet of the mercury analyzer 6, a bivalent mercury remover 52 is arranged on the elemental mercury pipeline, the bivalent mercury remover 52 is used for removing bivalent mercury in diluted sample gas, a reformer 53 is arranged on the bivalent mercury pipeline, and the reformer 53 is used for converting bivalent mercury into elemental mercury. The diluted sample gas can enter the elemental mercury pipeline through the diluted sample gas inlet 51, divalent mercury is removed by the divalent mercury remover 52 and then is sent to the mercury analyzer 6, and the mercury analyzer 6 measures the zero-valent mercury concentration. The diluted sample gas can also enter a divalent mercury pipeline through a diluted sample gas inlet 51, divalent mercury is converted into elemental mercury through a converter 53 and then is sent to a mercury analyzer 6, and the total mercury concentration is measured by the mercury analyzer 6.
The length of the flue gas circulation path between the sampling gun 1 and the conversion unit 5 is less than 30 meters, that is, the flue gas is filtered and diluted after being sampled, and then enters the conversion unit 5, the circulation path is shorter, so that partial bivalent mercury of the sample gas is prevented from being adsorbed on a pipeline in a longer circulation process, and the test result is prevented from being distorted.
The flue gas dilution pretreatment mercury concentration monitoring device provided by the embodiment of the invention can directly convert bivalent mercury into zero-valent mercury at a site discharge chimney, so that the measurement accuracy is ensured. In the related art, the discharge chimney is connected with the sample analysis chamber through a long heat preservation pipeline (generally more than 30 meters), and if the pipeline is not well preserved, bivalent mercury in the flue gas is easily adsorbed on the pipeline, so that the test result is distorted.
In some embodiments, as shown in fig. 1, a filter 3 is located in the filter cavity 2. The filter 3 is in a tube shape, a filter screen is arranged on the peripheral wall of the filter 3, a filtered air outlet 31 is arranged at the end part of the filter 3, and the sampled flue gas passes through the filter screen of the filter 3 from outside to inside for filtering. The sampling gun 1 inputs sampling flue gas into the filter cavity 2, and the flue gas in the filter cavity 2 is filtered from outside-in through the filter screen of the filter 3, and the filtered sampling flue gas is discharged out of the filter 3 through the filtered gas outlet 31, enters the flue 32 defined by the outside of the filter cavity 2, and the air inlet end of the flue 32 is communicated with the filtered gas outlet 31, and the sample gas inlet of the dilution unit 4 is communicated with the flue 32.
In some embodiments, the flue gas dilution pretreatment mercury concentration monitoring device further comprises a lance tube 8 and a blowback valve 81, wherein an air outlet of the lance tube 8 is communicated with the filtered air outlet 31, and the blowback valve 81 is arranged on the lance tube 8 for opening or closing the lance tube 8. When it is necessary to perform soot blowing, the soot blowing pipe 8 is opened by controlling the back-blowing valve 81, and the soot blowing pipe 8 blows purge gas into the filter 3 through the filtered gas outlet 31 to purge the filter 3.
In some embodiments, as shown in fig. 1, the dilution unit 4 includes a fine filter 42, a conical tube 43, a siphon port 44, a dilution gas pipe 45, and a dilution gas valve 46, and the fine filter 42 is provided at a sample gas inlet of the dilution unit 4 for fine filtering of the sample gas. The conical tube 43 is arranged at the downstream of the precise filter 42, the cross section of the conical tube is gradually reduced along the smoke flowing direction, the outlet of the conical tube 43 and the outlet of the dilution air tube 45 are both communicated with the siphon port 44, the dilution air tube 45 is used for inputting dilution air, and the dilution air is used for diluting sample air. A diluted sample gas outlet 41 is provided downstream of the siphon port 44, and diluted sample gas is discharged from the diluted sample gas outlet 41 to the dilution unit 4. A dilution gas valve 46 is provided on the dilution gas pipe 45 for controlling the flow rate of the dilution gas. The dilution sampling ratio can be adjusted by adjusting the dilution air valve 46, increasing the applicability of the system.
Further, in some embodiments, the flue gas dilution pretreatment mercury concentration monitoring device further comprises an air compressor 104 and a gas purifier 105, wherein an outlet of the air compressor 104 is communicated with the dilution gas inlet of the dilution unit 4, and the gas purifier 105 is arranged between the air compressor 104 and the dilution gas inlet of the dilution unit 4 for purifying gas. In the embodiment shown in fig. 1, the outlet of the air compressor 104 communicates with the dilution air duct 45 of the dilution unit 4, providing air as dilution air.
As shown in fig. 1, the outlet of the air compressor 104 is also in communication with the lance tube 8, i.e. the air compressor 10 is also used to provide the purge gas required for soot blowing.
In some embodiments, the flue gas dilution pretreatment mercury concentration monitoring device further comprises a jet unit 9, wherein the jet unit 9 is communicated with the filtered gas outlet 31 and is positioned downstream of the dilution unit 4, and the jet unit 9 samples the flue gas by utilizing the injection principle. Compared with the extraction type sample, the jet flow sampling is more stable in pressure and stronger in capability of resisting the interference of the pressure fluctuation of the emission source.
Specifically, as shown in fig. 1, the jet unit 9 includes a jet gas inlet, a jet gas valve 91 provided at the jet gas inlet, a sample gas injection port 92, and an excess flue gas outlet 93, the sample gas injection port 92 being in communication with each of the filtered gas outlet 31 and the jet gas inlet, the excess flue gas outlet 93 being in communication with the sample gas injection port 92 for discharging excess flue gas. Jet gas enters the jet unit 9 through a jet gas inlet, is discharged from a redundant flue gas outlet 93 through a sample gas injection port 92, and is discharged from the redundant flue gas outlet 93 after passing through the sample gas injection port 92 by utilizing the injection principle.
In the embodiment shown in fig. 1, the jet gas inlet of the jet unit 9 communicates with the flue 32 at a location downstream of the sample gas inlet of the dilution unit 4.
In some embodiments, to improve the accuracy of the test, the flue gas dilution pretreatment mercury concentration monitoring device further includes a thermostat case 101 and a heating block 102, wherein the filter chamber 2, the filter 3 and the dilution unit 4 are all located in the thermostat case 101, and the heating block 102 is provided on the outside or inside of the thermostat case 101 for heating to maintain the temperature inside the thermostat case 101.
For ease of installation, in some embodiments, as shown in fig. 1, the flue gas dilution pretreatment mercury concentration monitoring device includes a support 103, the support 103 being disposed adjacent to the stack 7, the thermostat housing 101 being mounted on the support 103, the conversion unit 5 being mounted on the support 103 and below the thermostat housing 101.
In some preferred embodiments, the length of the flue gas flow path between the sampling gun 1 to the conversion unit 5 is less than 10 meters. The flow path of the flue gas is as short as possible, which is helpful for reducing the adhesion of bivalent mercury in the flue gas in the flow process and improving the accuracy of the measurement result.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. The utility model provides a flue gas dilution pretreatment mercury concentration monitoring devices, its characterized in that includes sampling rifle, filter chamber, filter, diluting unit, conversion unit and mercury analyzer, the sampling end of sampling rifle stretches into the flue and carries out the sample of flue gas, the gassing end of sampling rifle with the filter chamber intercommunication, the filter is located filter chamber is filtered the sampling flue gas, diluting unit's sample gas inlet with the filtered gas outlet intercommunication of filter, diluting unit's diluted sample gas outlet with converting unit's diluted sample gas inlet intercommunication, diluting unit is used for diluting the sampling flue gas after filtering according to predetermineeing the proportion, converting unit includes parallelly connected element mercury pipeline and bivalent mercury pipeline, element mercury pipeline with bivalent mercury pipeline's the gas outlet end all with mercury analyzer's detection entry intercommunication, be equipped with bivalent mercury remover on the element mercury pipeline, be equipped with the converter on the bivalent mercury pipeline, the converter is used for converting bivalent mercury into element mercury, sampling rifle to the length of flue gas circulation path between the converting unit is less than 30 meters.
2. The device for monitoring the concentration of mercury in the flue gas dilution pretreatment according to claim 1, wherein the filter is cylindrical, a filter screen is arranged on the peripheral wall of the filter, the end part of the filter is provided with the filtered gas outlet, and the sampled flue gas passes through the filter screen from outside to inside for filtering.
3. The flue gas dilution pretreatment mercury concentration monitoring device according to claim 1 or 2, further comprising a lance tube and a blowback valve, wherein an air outlet of the lance tube is in communication with the filtered air outlet, and the blowback valve is provided on the lance tube.
4. The flue gas dilution pretreatment mercury concentration monitoring device according to claim 1, wherein the dilution unit comprises a precision filter, a conical tube, a siphon mouth, a dilution gas tube and a dilution gas valve, the precision filter is arranged at a sample gas inlet of the dilution unit, the conical tube is arranged at the downstream of the precision filter, the cross section of the conical tube gradually reduces along the flue gas flowing direction, the outlet of the conical tube and the outlet of the dilution gas tube are communicated with the siphon mouth, the outlet of the dilution sample gas is arranged at the downstream of the siphon mouth, and the dilution gas valve is arranged on the dilution gas tube and used for controlling the flow rate of the dilution gas.
5. The flue gas dilution pretreatment mercury concentration monitoring device according to claim 4, further comprising a jet unit, wherein the jet unit is communicated with the filtered gas outlet and is positioned downstream of the dilution unit, and the jet unit samples flue gas by utilizing an injection principle.
6. The flue gas dilution pretreatment mercury concentration monitoring device of claim 5, wherein the jet unit comprises a jet gas inlet, a jet gas valve disposed at the jet gas inlet, a sample gas injection port in communication with each of the filtered gas outlet and the jet gas inlet, and a waste flue gas outlet in communication with the sample gas injection port for exhausting waste flue gas.
7. The flue gas dilution pretreatment mercury concentration monitoring device of claim 1, further comprising a thermostat housing, wherein the filter chamber, the filter, and the dilution unit are all located in the thermostat housing, and a heating block provided outside or inside the thermostat housing for heating to maintain the temperature in the thermostat housing.
8. The flue gas dilution pretreatment mercury concentration monitoring device of claim 7, comprising a bracket disposed adjacent to the chimney, the thermostat housing mounted on the bracket, the conversion unit mounted on the bracket and positioned below the thermostat housing.
9. The flue gas dilution pretreatment mercury concentration monitoring device of claim 1, further comprising an air compressor, an outlet of the air compressor being in communication with the dilution gas inlet of the dilution unit, and a gas purifier disposed between the air compressor and the dilution gas inlet of the dilution unit for purification of gas.
10. The flue gas dilution pretreatment mercury concentration monitoring device of claim 1, wherein a length of a flue gas flow path between the sampling gun to the conversion unit is less than 10 meters.
CN202310596947.2A 2023-05-24 2023-05-24 Mercury concentration monitoring device for flue gas dilution pretreatment Pending CN116660467A (en)

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