CN116929891A - Wide-range flue gas dilution module, wide-range flue gas mercury concentration monitoring device and method - Google Patents
Wide-range flue gas dilution module, wide-range flue gas mercury concentration monitoring device and method Download PDFInfo
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- CN116929891A CN116929891A CN202310810246.4A CN202310810246A CN116929891A CN 116929891 A CN116929891 A CN 116929891A CN 202310810246 A CN202310810246 A CN 202310810246A CN 116929891 A CN116929891 A CN 116929891A
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- 238000010790 dilution Methods 0.000 title claims abstract description 308
- 239000012895 dilution Substances 0.000 title claims abstract description 308
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 113
- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 93
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 239000003546 flue gas Substances 0.000 title claims abstract description 68
- 238000012806 monitoring device Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000007789 gas Substances 0.000 claims abstract description 258
- 238000002347 injection Methods 0.000 claims abstract description 114
- 239000007924 injection Substances 0.000 claims abstract description 114
- 238000012544 monitoring process Methods 0.000 claims abstract description 11
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000000523 sample Substances 0.000 claims description 91
- 238000005070 sampling Methods 0.000 claims description 35
- 239000003085 diluting agent Substances 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 239000012470 diluted sample Substances 0.000 claims description 18
- 238000004891 communication Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000002253 acid Substances 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000007865 diluting Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 231100000693 bioaccumulation Toxicity 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
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- 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
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a wide-range flue gas dilution module, a wide-range flue gas mercury concentration monitoring device and a wide-range flue gas mercury concentration monitoring method. The dilution module comprises a plurality of dilution gas injection pipes and a plurality of dilution capillaries, wherein the air inlet ends of the dilution capillaries are used for entering sample gas before dilution, the dilution gas injection pipes are provided with dilution gas inlets, sample gas inlets and dilution sample gas outlets, the air outlet ends of the dilution capillaries are communicated with the sample gas inlets of the dilution gas injection pipes in a one-to-one correspondence manner, the dilution gas inlets are used for introducing dilution gas so that the sample gas is diluted into dilution sample gas by the dilution gas, the dilution sample gas outlets are used for discharging the dilution sample gas, and the cross sectional areas of the air inlet ends of the dilution capillaries are different or the cross sectional areas of the air outlet ends are different so that the dilution ratios of the corresponding dilution gas injection pipes are different. The proper dilution ratio can be selected according to the concentration range of the pollution source flue gas and the mercury emission concentration range in the flue gas, so that a specific dilution capillary is selected to dilute the flue gas sample gas, and the application range is wider.
Description
Technical Field
The invention relates to the technical field of mercury analysis, in particular to a wide-range flue gas dilution module, a wide-range flue gas mercury concentration monitoring device and a wide-range flue gas mercury concentration monitoring method.
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 concentration of the fixed source mercury emission in real time, so as to accurately obtain the total mercury emission measurement. The dilution ratio range of a dilution module for diluting the sampling gas of the mercury concentration monitoring device in the related art is limited, and the device cannot adapt to and match the mercury emission concentration ranges of different pollution sources and mercury concentration wide fluctuation scenes.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a wide-range flue gas dilution module which can be suitable for wide-range mercury concentration monitoring.
The embodiment of the invention also provides a wide-range flue gas mercury concentration monitoring device with the wide-range flue gas dilution module and a mercury concentration monitoring method.
The wide-range flue gas dilution module comprises a plurality of dilution gas injection pipes and a plurality of dilution capillaries, wherein the air inlet ends of the dilution capillaries are used for leading in sample gas before dilution, the dilution gas injection pipes are provided with dilution gas inlets, sample gas inlets and dilution sample gas outlets, the air outlet ends of the dilution capillaries are communicated with the sample gas inlets of the dilution gas injection pipes in a one-to-one correspondence manner, the dilution gas inlets are used for introducing dilution gas so that the sample gas is diluted by the dilution gas into diluted sample gas, the dilution sample gas outlets are used for discharging the diluted sample gas, and the cross sectional areas of the air inlet ends of the dilution capillaries are different or the cross sectional areas of the air outlet ends of the dilution capillaries are different so that the dilution ratios of the corresponding dilution gas injection pipes are different.
The wide-range flue gas dilution module provided by the embodiment of the invention comprises a plurality of dilution capillaries with different sections and dilution gas injection pipes with different dilution ratios, wherein the dilution capillaries are in one-to-one correspondence with the dilution gas injection pipes, and the proper dilution ratio can be selected according to the concentration range of the flue gas of a pollution source and the mercury emission concentration range in the flue gas, so that a specific dilution capillary is selected to dilute the flue gas sample gas, the application range is wider, and the wide-range flue gas dilution module is suitable for diluting the sample gas in the mercury concentration greatly-fluctuating scenes such as cement kilns, garbage ovens and the like, and is also suitable for low-mercury concentration emission scenes.
In some embodiments, the dilution capillary is a conical tube and has a cross-sectional area that tapers in the direction of sample gas flow.
In some embodiments, a conical section is disposed in the dilution gas injection pipe, the conical section is located upstream of the sample gas inlet, and the cross-sectional area of the conical section gradually decreases along the direction of the flow of the dilution gas.
In some embodiments, the wide-range flue gas dilution module further comprises an injection air source, a plurality of air pipes and a plurality of valves, wherein the injection air source is communicated with the dilution air inlets of the dilution air injection pipes through the air pipes, and the valves are arranged on the air pipes in a one-to-one correspondence manner.
In some embodiments, the wide range flue gas dilution module comprises a dilution sample gas pipeline, the dilution capillary comprises a first dilution capillary and a second dilution capillary, the dilution gas injection pipe comprises a first dilution gas injection pipe communicated with the first dilution capillary and a second dilution gas injection pipe communicated with the second dilution capillary, the cross-sectional area of the air inlet end of the first dilution capillary is larger than the cross-sectional area of the air inlet end of the second dilution capillary, and the dilution sample gas outlet of the first dilution gas injection pipe and the dilution sample gas outlet of the second dilution gas injection pipe are opposite and are both communicated with the air inlet end of the dilution sample gas pipeline.
In some embodiments, the dilution capillary has an inlet end with a different cross-sectional area and the dilution capillary has an inlet end with a diameter of 1-2 millimeters.
In another aspect, the device for monitoring mercury concentration in flue gas with wide measuring range provided by the embodiment of the invention comprises: a sampling assembly for extracting a sample gas from a flue; the wide range flue gas dilution module according to any one of the preceding embodiments, wherein an air inlet end of the dilution capillary communicates with the sampling assembly; the analysis module comprises a conversion unit and a mercury analyzer, wherein the diluted sample gas outlets of a plurality of diluted gas injection pipes are communicated with the conversion unit, the conversion unit comprises an elemental mercury pipeline and a divalent mercury pipeline which are connected in parallel, the elemental mercury pipeline and the gas outlet end of the divalent mercury pipeline are communicated with the detection inlet of the mercury analyzer, a divalent mercury remover is arranged on the elemental mercury pipeline, a conversion furnace is arranged on the divalent mercury pipeline, and the conversion furnace is used for converting divalent mercury into elemental mercury.
In some embodiments, the sampling assembly comprises a sampling tube, a gas injection tube and a return tube, wherein the gas inlet end of the sampling tube extends into the flue for sampling, the gas inlet ends of the dilution capillaries are all communicated with the sampling tube, the gas outlet end of the sampling tube is communicated with the middle part of the gas injection tube, the gas injection tube is used for injecting gas so as to form negative pressure at the gas outlet end of the sampling tube, the gas inlet end of the return tube is communicated with the tail end of the gas injection tube, and the gas outlet end of the return tube extends into the flue.
In some embodiments, the sampling assembly and the wide range flue gas dilution module share an injection gas source, and a gas purifier is disposed between the injection gas source and the wide range flue gas dilution module.
In another aspect, the method for monitoring the mercury concentration in the flue gas with wide range provided by the embodiment of the invention comprises the following steps:
matching an adapted range of flue gas concentrations for each of the dilution capillaries, wherein the dilution capillaries having a larger cross-sectional area correspond to a lower dilution ratio;
judging the discharge concentration of the flue gas in the flue, and matching the corresponding dilution capillary according to the discharge concentration;
and injecting diluent gas into a diluent gas injection pipe corresponding to the diluent capillary to dilute the sample gas, and enabling the diluted diluent sample gas to flow to the analysis module for mercury concentration analysis.
Drawings
Fig. 1 is a schematic structural diagram of a wide-range flue gas mercury concentration monitoring device in an embodiment of the invention.
Reference numerals:
a dilution module 100,
A dilution gas injection pipe 110, a first dilution injection pipe 1101, a second dilution injection pipe 1102, a dilution gas inlet 111, a sample gas inlet 112, a dilution sample gas outlet 113, a tapered section 114,
A dilution capillary 120, a first dilution capillary 1201, a second dilution capillary 1202, a vacuum gauge 121,
An injection air source 130, an air pipe 131, a first valve 132, a second valve 133, a gas purifier 134,
Diluted sample gas line 140,
Sampling assembly 200, sampling tube 210, gas injection tube 220, return tube 230,
A conversion unit 300, an elemental mercury pipeline 310, a bivalent mercury remover 311, a bivalent mercury pipeline 320, a conversion furnace 321, an acid removal absorption bottle 322, a mercury analyzer 400 and a flue 500.
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 wide-range flue gas dilution module 100 and the wide-range flue gas mercury concentration monitoring system with the same provided by the embodiment of the invention are described below with reference to fig. 1.
The dilution module 100 includes a number of dilution gas injection pipes 110 and a number of dilution capillaries 120. The dilution gas injection pipes 110 are in one-to-one correspondence with the dilution capillaries 120. The dilution capillary 120 has a through air inlet end and an air outlet end, and the air inlet end of the dilution capillary 120 is used for entering the sample gas before dilution. The dilution gas injection pipe 110 is provided with a dilution gas inlet 111, a sample gas inlet 112 and a dilution sample gas outlet 113, wherein the sample gas inlet 112 is used for introducing sample gas into the dilution gas injection pipe 110, the gas outlet ends of the dilution capillaries 120 are correspondingly communicated with the sample gas inlets 112 of the dilution gas injection pipes 110 one by one, and flue gas sample gas enters the corresponding dilution gas injection pipes 110 from the gas outlet ends of the dilution capillaries 120 through the sample gas inlets 112. The dilution gas inlet 111 is used for introducing dilution gas so that the sample gas in the dilution gas injection pipe 110 is diluted into diluted sample gas by the dilution gas, and the diluted sample gas outlet 113 is used for discharging the diluted sample gas. That is, the diluent gas is introduced into the diluent gas injection tube 110 from the diluent gas inlet 111, and after being mixed with the sample gas introduced into the tube from the sample gas inlet 112, the sample gas is diluted into a diluted sample gas, and the dilution ratio is related to the amount of the sample gas introduced and the amount of the diluent gas introduced.
The cross-sectional areas of the inlet ends of the dilution capillaries 120 are different, or the cross-sectional areas of the outlet ends of the dilution capillaries 120 are different, so that the dilution ratios of the corresponding dilution gas injection pipes 110 are different. The amount of sample that is introduced into the dilution gas injection pipe 110 per unit time by the dilution capillary 120 is related to the cross-sectional area of its inlet end or its outlet end. For example, the cross-sectional area of the outlet end of the dilution capillary 120 is the same, the larger the cross-sectional area of the inlet end thereof, the more sample gas can be introduced in unit time, and the dilution ratio of the corresponding dilution gas injection pipe 110 is lower; the cross-sectional area of the air inlet end of the dilution capillary 120 is the same, the larger the cross-sectional area of the air outlet end of the dilution capillary is, more sample gas can be introduced in unit time, and the dilution ratio of the corresponding dilution gas injection pipe 110 is small; the cross-sectional area of the outlet end of the dilution capillary 120 is the same, the smaller the cross-sectional area of the inlet end is, the smaller the amount of sample gas can be introduced in unit time, and the dilution ratio of the corresponding dilution gas injection pipe 110 is higher; the smaller the cross-sectional area of the air inlet end of the dilution capillary 120 is, the smaller the sample amount can be introduced in unit time, and the dilution ratio of the corresponding dilution gas injection pipe 110 is higher. It will be appreciated that the dilution ratio in the various dilution gas injection pipes 110 can be determined based on the test.
The wide-range flue gas dilution module provided by the embodiment of the invention comprises a plurality of dilution capillaries with different sections and dilution gas injection pipes with different dilution ratios, wherein the dilution capillaries are in one-to-one correspondence with the dilution gas injection pipes, and the proper dilution ratio can be selected according to the concentration range of the flue gas of a pollution source and the mercury emission concentration range in the flue gas, so that a specific dilution capillary is selected to dilute the flue gas sample gas, the application range is wider, and the wide-range flue gas dilution module is suitable for diluting the sample gas in the mercury concentration greatly-fluctuating scenes such as cement kilns, garbage ovens and the like, and is also suitable for low-mercury concentration emission scenes.
In some embodiments, as shown in FIG. 1, the dilution capillary 120 is a conical tube with a cross-sectional area that tapers in the direction of sample gas flow. That is, the cross-sectional area of the air inlet end of the dilution capillary 120 is larger than that of the air outlet end, and the flow velocity of the air flow in the dilution capillary 120 gradually increases from the air inlet end to the air outlet end, which is beneficial to the rapid and uniform mixing between the sample gas and the dilution gas. In addition, the tapered dilution capillary 120 is easier to fabricate.
Further, since the size of the outlet end of the dilution capillary 120 is small, it is difficult to control, and the cross-sectional area of the inlet end of the dilution capillary 120 is made different for easier manufacturing. Alternatively, the diameter of the air inlet end of the dilution capillary 120 is 1-2 mm.
Further alternatively, the diameter of the outlet end of dilution capillary 120 is 0.05-0.5 mm.
In some embodiments, as shown in FIG. 1, a tapered section 114 is provided within the diluent gas injection tube 110, the tapered section 114 being upstream of the sample gas inlet 112 and the cross-sectional area of the tapered section 114 gradually decreasing in the direction of diluent gas flow. Specifically, the taper section 114 has an air inlet end and an air outlet end, the cross-sectional area of which gradually decreases from the air inlet end to the air outlet end, the sample gas inlet 112 is located on the air outlet side of the taper section 114, and the diluent gas passes through the taper section 114 to the sample gas inlet 112 after entering from the diluent gas inlet 111 of the diluent gas injection tube 110. As the cross section of the conical section 114 is reduced, the flow speed of the diluent gas flow is increased in the process of passing through the conical section 114, so that the negative pressure at the sample gas inlet 112 is increased, and the sample gas is promoted to continuously enter the diluent gas injection pipe 110 from the sample gas inlet 112 and be mixed with the diluent gas.
In some embodiments, as shown in fig. 1, the dilution module 100 further includes an ejector gas source 130, a number of gas lines 131, and a number of valves. The injection air source 130 is communicated with the dilution air inlets 111 of the dilution air injection pipes 110 in a one-to-one correspondence manner through a plurality of air pipes 131, and a plurality of valves are arranged on the plurality of air pipes 131 in a one-to-one correspondence manner and used for opening or cutting off the air pipes 131. Opening a corresponding valve on the air pipe 131, and enabling the diluent gas in the injection air source 130 to enter the corresponding diluent gas injection pipe 110 through the air pipe 131 to dilute the sample gas; the valve on the air pipe 131 is closed, and the dilution air injection pipe 110 corresponding to the air pipe 131 is not diluted. Therefore, by operating the valve, the operation of the different dilution gas injection pipes 110 and the dilution capillaries 120 can be switched, and the adjustment of different dilution ratios can be realized.
By way of example, in the embodiment shown in fig. 1, both the dilution capillary 120 and the dilution gas injection tube 110 are provided with two, their corresponding dilution ratios being different. Specifically, as shown in fig. 1, the dilution capillary 120 includes a first dilution capillary 1201 and a second dilution capillary 1202. The dilution gas injection line 110 includes a first dilution gas injection line 1101 and a second dilution gas injection line 1102. The outlet end of the first dilution capillary 1201 is in communication with the sample gas inlet 112 of the first dilution gas injection pipe 1101, and the outlet end of the second dilution capillary 1202 is in communication with the sample gas inlet 112 of the second dilution gas injection pipe 1102.
The cross-sectional area of the inlet end of the first dilution capillary 1201 is greater than the cross-sectional area of the inlet end of the second dilution capillary 1202, and the cross-sectional area of the outlet end of the first dilution capillary 1201 is equal to the cross-sectional area of the outlet end of the second dilution capillary 1202. It can be understood that, if the sample airflow flux of the first dilution capillary 1201 is greater than that of the second dilution capillary 1202 in unit time, the first dilution capillary 1201 is a low dilution capillary, which corresponds to a smaller dilution ratio of the first dilution gas injection pipe 1101, and the second dilution capillary 1202 is a high dilution capillary, which corresponds to a larger dilution ratio of the second dilution gas injection pipe 1102.
The dilution module 100 further includes a dilution sample gas line 140, with the dilution sample gas outlet 113 of the first dilution gas injection line 1101 and the dilution sample gas outlet 113 of the second dilution gas injection line 1102 being opposite and both in communication with the inlet end of the dilution sample gas line 140. The diluted sample gas line 140 is used to discharge the diluted sample gas in the dilution module 100 to the next module. As shown in fig. 1, the first dilution gas injection pipe 1101 and the second dilution gas injection pipe 1102 extend in the same direction, and the air inlet end of the dilution sample gas pipe 140 is diametrically opposite to the dilution sample gas outlet 113 of the two.
Correspondingly, the injection air source 130 is respectively communicated with the dilution air inlet 111 of the first dilution injection pipe 1101 and the dilution air inlet 111 of the second dilution injection pipe 1102 through two parallel air pipes 131, and the two air pipes 131 are respectively provided with a first valve 132 and a second valve 133.
When the concentration of mercury discharged from the pollution source is smaller and the required dilution ratio is smaller, the first valve 132 is opened, the second valve 133 is closed, the injection air source 130 introduces the dilution air into the dilution air inlet 111 of the first dilution injection pipe 1101 through the air pipe 131, the dilution air is pressurized by the conical section 114 in the first dilution injection pipe 1101 and then mixed with the sample air discharged from the first dilution capillary 1201 to dilute the sample air into the dilution sample air, and the dilution sample air is discharged from the dilution sample air pipeline 140 to the next module.
When the mercury emission concentration of the pollution source is large and the required dilution ratio is large, the first valve 132 is closed, the second valve 133 is opened, the injection air source 130 introduces dilution air into the dilution air inlet 111 of the second dilution injection pipe 1102 through the air pipe 131, the dilution air is pressurized by the conical section 114 in the second dilution injection pipe 1102 and then mixed with sample air discharged from the second dilution capillary 1202, the sample air is diluted into diluted sample air, and the diluted sample air is discharged from the diluted sample air pipe 140 to the next module.
Further, as shown in fig. 1, each of the first dilution capillary 1201 and the second dilution capillary 1202 is provided with a vacuum gauge 121 for measuring pressure correspondingly.
The embodiment of the invention also provides a wide-range flue gas mercury concentration monitoring device, which comprises a sampling assembly 200, a wide-range flue gas dilution module 100 and an analysis module. The sampling assembly is used to extract sample gas from the flue 500, and the inlet end of the dilution capillary 120 of the dilution module 100 is in communication with the sampling assembly 200. The analysis module comprises a conversion unit 300 and a mercury analyzer 400, wherein the dilution sample gas outlets 113 of a plurality of dilution gas injection pipes 110 are all communicated with the conversion unit 300, the conversion unit 300 comprises an elemental mercury pipeline 310 and a divalent mercury pipeline 320 which are connected in parallel, the gas outlet ends of the elemental mercury pipeline 310 and the divalent mercury pipeline 320 are all communicated with the detection inlet of the mercury analyzer 400, a divalent mercury remover 311 is arranged on the elemental mercury pipeline 310, the divalent mercury remover 311 is used for removing divalent mercury in the dilution sample gas, a conversion furnace 321 is arranged on the divalent mercury pipeline 320, and the conversion furnace 321 is used for converting divalent mercury into elemental mercury.
In the embodiment shown in fig. 1, the dilution gas injection pipe 110 communicates with the elemental mercury pipe 310 and the divalent mercury pipe 320 of the conversion unit 300 through the dilution sample gas pipe 140, and the dilution sample gas discharged from the dilution gas injection pipe 110 can selectively enter the elemental mercury pipe 310 or the divalent mercury pipe 320 through the dilution sample gas pipe 140. As shown in fig. 1, valves are provided on both the elemental mercury line 310 and the divalent mercury line 320 for opening or shutting off the lines.
When the elemental mercury concentration in the sample gas is measured, the valve on the bivalent mercury line 320 is closed and the valve on the elemental mercury line 310 is opened. The diluted sample gas enters an elemental mercury pipeline 310, divalent mercury is removed by a divalent mercury remover 311 and then is sent to a mercury analyzer 400, and the mercury analyzer 400 measures the zero-valent mercury concentration. When the total mercury concentration in the sample gas is measured, a valve on the bivalent mercury pipeline 320 is opened, a valve on the elemental mercury pipeline 310 is closed, the diluted sample gas enters the bivalent mercury pipeline 320, the bivalent mercury is converted into elemental mercury through the reformer 321, and then the elemental mercury is sent to the mercury analyzer 400, and the total mercury concentration is measured by the mercury analyzer 400.
Further, as shown in fig. 1, an acid removal absorption bottle 322 for removing acid is further provided on the divalent mercury line 320, and the acid removal absorption bottle 322 is located downstream of the reformer 321. The acid removal absorption bottle 322 removes acid from the converted flue gas, so that the reduction efficiency of bivalent mercury in the flue gas is ensured, and the accuracy of the measurement result is higher.
Alternatively, the bivalent mercury remover 311 is a dioxygen absorbing bottle.
In some embodiments, the sampling assembly 200 includes, as shown in fig. 1, a sampling tube 210, a gas injection tube 220 and a return tube 230, where the gas inlet end of the sampling tube 210 extends into the flue 500 for sampling, the gas inlet ends of the dilution capillaries 120 are all communicated with the middle of the sampling tube 210, the gas outlet end of the sampling tube 210 is communicated with the middle of the gas injection tube 220, the gas injection tube 220 is used for injecting gas to form negative pressure at the gas outlet end of the sampling tube 210, the gas inlet end of the return tube 230 is communicated with the tail end of the gas injection tube 220, the gas outlet end of the return tube 230 extends into the flue 400, and the injected gas flow and redundant flue gas in the gas injection tube 220 returns to the flue 400 through the return tube 230. Compared with the extraction type sample, the jet flow sampling method has the advantages that the pressure of the extraction type sample is more stable, and the capability of resisting the interference of the pressure fluctuation of the emission source is stronger.
Further, as shown in FIG. 1, the sampling assembly 200 and the dilution module 100 share an injection gas source 130, that is, an injection gas source for providing injection gas to the gas injection line 220 and also for providing dilution gas to the dilution gas injection line 110. As shown in fig. 1, a gas purifier 134 for gas purification is provided between the ejector gas source 130 and the dilution module 100.
The embodiment of the invention also provides a wide-range flue gas mercury concentration monitoring method, which is based on the wide-range flue gas mercury concentration monitoring device in any one of the embodiments, for monitoring the mercury concentration in flue gas, and comprises the following steps:
step 1: matching an adapted range of flue gas concentrations for each dilution capillary 120, wherein a dilution capillary 120 having a larger cross-sectional area corresponds to a lower dilution ratio;
step 2: judging the discharge concentration of the flue gas in the flue 500, and matching the corresponding dilution capillary 120 according to the discharge concentration;
step 3: and injecting diluent gas into the diluent gas injection pipe 110 corresponding to the corresponding diluent capillary 120 to dilute the sample gas, and analyzing the mercury concentration of the diluted diluent sample gas to an analysis module.
In step 1, the range of the smoke concentration matched and adapted to each dilution capillary 120 may be determined through experiments, the ratio of the dilution required by different smoke concentrations is different, and the matching of each dilution capillary 120 in advance may facilitate the selection of the proper dilution capillary 120 for operation in step 2.
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.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
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 wide-range flue gas dilution module is characterized by comprising a plurality of dilution gas injection pipes and a plurality of dilution capillaries, wherein the air inlet ends of the dilution capillaries are used for entering sample gas before dilution, each dilution gas injection pipe is provided with a dilution gas inlet, a sample gas inlet and a dilution sample gas outlet, the air outlet ends of the dilution capillaries are communicated with the sample gas inlets of the dilution gas injection pipes in a one-to-one correspondence manner, the dilution gas inlets are used for introducing dilution gas so that the sample gas is diluted into diluted sample gas by the dilution gas, the dilution sample gas outlets are used for discharging the diluted sample gas, and the cross sectional areas of the air inlet ends of the dilution capillaries are different or the cross sectional areas of the air outlet ends of the dilution capillaries are different so that the dilution ratios of the corresponding dilution gas injection pipes are different.
2. The wide range flue gas dilution module according to claim 1, wherein the dilution capillary tube is a conical tube and has a cross-sectional area that gradually decreases in the direction of the sample gas flow.
3. The wide range flue gas dilution module according to claim 2, wherein the cross-sectional areas of the inlet ends of the dilution capillaries differ, the inlet ends of the dilution capillaries having a diameter of 1-2 mm.
4. The wide range flue gas dilution module according to claim 1, wherein a conical section is provided in the dilution gas injection pipe, the conical section being located upstream of the sample gas inlet and the cross-sectional area of the conical section gradually decreasing in the direction of the flow of the dilution gas.
5. The wide range flue gas dilution module according to claim 1, further comprising an injection air source, a plurality of air pipes and a plurality of valves, wherein the injection air source is communicated with the dilution air inlets of the dilution air injection pipes through a plurality of air pipes, and the valves are arranged on the air pipes in a one-to-one correspondence.
6. The wide range flue gas dilution module according to claim 5, comprising a dilution sample gas line, wherein the dilution capillary comprises a first dilution capillary and a second dilution capillary, the dilution gas injection line comprises a first dilution gas injection line in communication with the first dilution capillary and a second dilution gas injection line in communication with the second dilution capillary, the cross-sectional area of the air inlet end of the first dilution capillary is greater than the cross-sectional area of the air inlet end of the second dilution capillary, and the dilution sample gas outlet of the first dilution gas injection line and the dilution sample gas outlet of the second dilution gas injection line are opposite and are both in communication with the air inlet end of the dilution sample gas line.
7. A wide-range flue gas mercury concentration monitoring device, comprising:
a sampling assembly for extracting a sample gas from a flue;
the wide range flue gas dilution module of any one of claims 1-6, an air inlet end of the dilution capillary tube in communication with the sampling assembly;
the analysis module comprises a conversion unit and a mercury analyzer, wherein the diluted sample gas outlets of a plurality of diluted gas injection pipes are communicated with the conversion unit, the conversion unit comprises an elemental mercury pipeline and a divalent mercury pipeline which are connected in parallel, the elemental mercury pipeline and the gas outlet end of the divalent mercury pipeline are communicated with the detection inlet of the mercury analyzer, a divalent mercury remover is arranged on the elemental mercury pipeline, a conversion furnace is arranged on the divalent mercury pipeline, and the conversion furnace is used for converting divalent mercury into elemental mercury.
8. The wide-range flue gas mercury concentration monitoring device according to claim 7, wherein the sampling assembly comprises a sampling tube, a gas injection tube and a return tube, wherein an air inlet end of the sampling tube extends into the flue for sampling, air inlet ends of a plurality of dilution capillaries are communicated with the sampling tube, an air outlet end of the sampling tube is communicated with the middle part of the gas injection tube, the gas injection tube is used for injecting gas to form negative pressure at the air outlet end of the sampling tube, the air inlet end of the return tube is communicated with the tail end of the gas injection tube, and the air outlet end of the return tube extends into the flue.
9. The wide-range flue gas mercury concentration monitoring device according to claim 8, wherein the sampling assembly and the wide-range flue gas dilution module share an injection gas source, and a gas purifier is arranged between the injection gas source and the wide-range flue gas dilution module.
10. A wide-range flue gas mercury concentration monitoring method, characterized in that the mercury concentration in flue gas is monitored based on the wide-range flue gas mercury concentration monitoring device according to any one of claims 7 to 9, and the mercury concentration detection method comprises:
matching an adapted range of flue gas concentrations for each of the dilution capillaries, wherein the dilution capillaries having a larger cross-sectional area correspond to a lower dilution ratio;
judging the discharge concentration of the flue gas in the flue, and matching the corresponding dilution capillary according to the discharge concentration;
and injecting diluent gas into a diluent gas injection pipe corresponding to the diluent capillary to dilute the sample gas, and enabling the diluted diluent sample gas to flow to the analysis module for mercury concentration analysis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310810246.4A CN116929891A (en) | 2023-07-03 | 2023-07-03 | Wide-range flue gas dilution module, wide-range flue gas mercury concentration monitoring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310810246.4A CN116929891A (en) | 2023-07-03 | 2023-07-03 | Wide-range flue gas dilution module, wide-range flue gas mercury concentration monitoring device and method |
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| Publication Number | Publication Date |
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| CN116929891A true CN116929891A (en) | 2023-10-24 |
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| CN202310810246.4A Pending CN116929891A (en) | 2023-07-03 | 2023-07-03 | Wide-range flue gas dilution module, wide-range flue gas mercury concentration monitoring device and method |
Country Status (1)
| Country | Link |
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| CN (1) | CN116929891A (en) |
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2023
- 2023-07-03 CN CN202310810246.4A patent/CN116929891A/en active Pending
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