CN111781251A - Device for measuring content of low-concentration gas in flue gas - Google Patents
Device for measuring content of low-concentration gas in flue gas Download PDFInfo
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- 239000007789 gas Substances 0.000 title claims abstract description 237
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 239000003546 flue gas Substances 0.000 title claims abstract description 29
- 238000001179 sorption measurement Methods 0.000 claims abstract description 101
- 238000003795 desorption Methods 0.000 claims abstract description 99
- 238000005070 sampling Methods 0.000 claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 239000002808 molecular sieve Substances 0.000 claims description 17
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 17
- 230000000903 blocking effect Effects 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- -1 ZSM-5 Chemical compound 0.000 claims description 4
- 241000269350 Anura Species 0.000 claims description 3
- 239000012494 Quartz wool Substances 0.000 claims description 3
- 239000011491 glass wool Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000002336 sorption--desorption measurement Methods 0.000 abstract description 15
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 31
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 10
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 9
- 238000005868 electrolysis reaction Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000000779 smoke Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000002798 spectrophotometry method Methods 0.000 description 4
- 239000007853 buffer solution Substances 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000013618 particulate matter Substances 0.000 description 3
- 238000001354 calcination Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000013076 target substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- YNLAOSYQHBDIKW-UHFFFAOYSA-M diethylaluminium chloride Chemical compound CC[Al](Cl)CC YNLAOSYQHBDIKW-UHFFFAOYSA-M 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002912 waste gas Substances 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
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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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
- G01N1/34—Purifying; Cleaning
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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
- G01N1/40—Concentrating samples
- G01N1/4022—Concentrating samples by thermal techniques; Phase changes
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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
- G01N1/40—Concentrating samples
- G01N1/405—Concentrating samples by adsorption or absorption
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Abstract
The invention discloses a device for measuring the content of low-concentration gas in flue gas, which comprises a gas adsorption desorption pipe, wherein a gas adsorption part is filled in the gas adsorption desorption pipe; the heater is arranged on the outer wall of the gas adsorption desorption pipe; the sampling pump is communicated with the outlet end of the gas adsorption desorption pipe through a sampling pipeline, and a sampling control valve is installed on the sampling pipeline; the gas storage tank is communicated with the outlet end of the gas adsorption and desorption pipe through a storage pipeline, and a desorption control valve is installed on the storage pipeline; the invention discloses a device for measuring the content of low-concentration gas in flue gas, which enriches target objects in the gas through a gas adsorption desorption pipe, so that the concentration of the target objects is higher than the detection limit; after the preset time of enrichment, the heating pipe is used for heating, and the gas enriched in the gas adsorption desorption pipe is completely desorbed, so that the concentration of the target object can be detected by using a gas determinator on site, and the measurement efficiency is greatly improved.
Description
Technical Field
The invention relates to the technical field of environmental monitoring, and particularly discloses a device for measuring the content of low-concentration gas in flue gas.
Background
When the fixed potential electrolysis method is used for measuring carbon monoxide, nitrogen oxide and sulfur dioxide in gas, the concentration of the carbon monoxide, the nitrogen oxide and the sulfur dioxide in the gas is often lower than the detection limit (3 mg/m 3) of the fixed potential electrolysis method, so that the measurement of the carbon monoxide, the nitrogen oxide and the sulfur dioxide in the gas cannot be completed on site.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present invention is to provide a device for measuring the content of low-concentration gas in flue gas, which has a simple structure, is convenient to operate, and can quickly measure the content of gas with the concentration lower than the detection limit of a constant potential electrolysis method.
The device for measuring the content of the low-concentration gas in the flue gas comprises: the gas adsorption and desorption pipe is filled with a gas adsorption component; a heater disposed on an outer wall of the gas adsorption and desorption pipe; the sampling pump is communicated with the outlet end of the gas adsorption and desorption pipe through a sampling pipeline, and a sampling control valve is installed on the sampling pipeline; the gas storage tank is provided with a gas inlet communicated with the outlet end of the gas adsorption and desorption pipe through a storage pipeline, and the storage pipeline is provided with a desorption control valve; the gas measuring instrument is connected and communicated with a gas outlet of the gas storage tank through a measuring pipeline; and a measurement control valve is arranged on the measurement pipeline.
According to the prior art in the background of the patent, at present, for the determination of the gas content with the concentration lower than the detection limit of a constant potential electrolysis method, the gas content is mainly determined by a spectrophotometry method from a measurement chamber after field sampling, so that the time and the labor are wasted, and the efficiency is lower; in the device for measuring the content of the low-concentration gas in the flue gas, the sampling control valve is opened, the desorption control valve is closed, the measurement control valve is closed, the gas inlet end of the gas adsorption and desorption pipe is inserted into the gas path to be measured, the sampling pump provides power to enable the gas to be measured to enter the gas adsorption and desorption pipe, the target object in the gas is enriched through the gas adsorption part in the gas adsorption and desorption pipe, so that the concentration of the target object is higher than the detection limit, and meanwhile, the particulate matter blocking parts at the two ends of the gas adsorption and desorption pipe block charged smoke dust particles from entering the gas adsorption and desorption pipe, so that the particles are prevented from entering the direct-reading gas measuring instrument to protect the direct-reading gas measuring instrument; after the preset time of enrichment, the gas inlet end of the gas adsorption and desorption pipe is closed, the sampling control valve is closed, the desorption control valve is opened, heating is carried out through the heating pipe, all the target objects enriched in the gas adsorption and desorption pipe are desorbed and enter the gas storage tank, meanwhile, the temperature detection unit detects the temperature of the outer wall of the gas adsorption and desorption pipe, the temperature control unit controls the heating of the heater according to the temperature detected by the detection unit, after the preset time of desorption, the desorption control valve is closed, the determination control valve is opened, the concentration of the target objects can be detected by using a gas determinator on site by adopting a constant potential electrolysis method, and the measurement efficiency is greatly improved.
In addition, the device for measuring the content of the low-concentration gas in the flue gas according to the above embodiment of the invention may further have the following additional technical features:
further, the device for measuring the content of the low-concentration gas in the flue gas further comprises a temperature detection unit for detecting the temperature of the outer wall of the gas adsorption and desorption pipe, wherein the temperature detection unit is arranged on the outer wall of the gas adsorption and desorption pipe; and the temperature control unit is used for controlling the temperature of the outer wall of the gas adsorption and desorption pipe, and is connected with the temperature detection unit and the heater.
Further, the device for measuring the content of the low-concentration gas in the flue gas also comprises a desorption power pump and a power pump control valve; the storage pipeline is sequentially provided with the desorption control valve, the desorption power pump and the power pump control valve; the other end of the power pump control valve is connected and communicated with the air inlet of the gas storage tank.
Further, the power pump control valve is a shutoff valve.
Further, the heater comprises a heating pipe, and the heating pipe is sleeved outside the gas adsorption and desorption pipe; and the heating resistance wire is arranged in the pipe wall of the heating pipe.
Further, two ports of the gas adsorption and desorption pipe are covered with a particulate matter blocking part.
Still further, the particulate blocking member is a blocking member made of glass wool and/or quartz wool.
Furthermore, the gas adsorption component is made of at least one adsorption material of activated carbon, Na-type molecular sieves, ZSM-5, 13X, SAPO, Y-type molecular sieves and the like.
Further, the particle size of the gas adsorption member is 10 to 40 mesh, preferably 20 to 30 mesh.
Furthermore, the gas adsorption component is subjected to high-temperature roasting pretreatment and then is subjected to drying and cooling so as to improve the adsorption efficiency.
Furthermore, the roasting temperature is 400-600 ℃, and the roasting time is 1-3 h.
Preferably, the roasting temperature is 500 ℃ and the roasting time is 2 h.
The gas adsorption component can adsorb a target object, has a great adsorption effect on moisture, and can be well suitable for sampling with great smoke humidity; further, the gas adsorbing member is activated by firing; removing the water and other substances adsorbed on the surface of the gas adsorption component to release more adsorption sites for adsorbing the target component.
The particle size and the roasting temperature of the gas adsorption component are set to improve the absorption efficiency of the gas adsorption component, so that gas to be detected is prevented from entering the sampling pump.
Further, the maximum heating temperature of the heater is 600 ℃.
Further, the sampling control valve is a stop valve, and the desorption control valve is a check valve.
Further, the volume of the gas storage tank is 100 mL-10L.
Further, the gas measuring instrument is a direct-reading gas measuring instrument.
Further, the metering control valve is a check valve.
According to another aspect of the present invention, there is also provided a low concentration gas concentration detection method based on the above gas content measurement apparatus, including the steps of:
a gas adsorption step, wherein a sampling control valve is opened, and a desorption control valve and a determination control valve are closed; the sampling pump provides power to enable the gas to be detected to enter the gas adsorption desorption pipe;
in the desorption step, after the gas adsorption is carried out for a preset adsorption time, the gas inlet end of the gas adsorption and desorption pipe is closed, the sampling control valve is closed, the desorption control valve is opened, the heating pipe heats the gas adsorption and desorption pipe, meanwhile, the temperature detection unit detects the temperature of the outer wall of the gas adsorption and desorption pipe, and the temperature control unit controls the heating of the heater according to the temperature detected by the detection unit;
the method comprises a determination step, wherein after preset desorption time, a desorption control valve is closed, a determination control valve is opened, the concentration of a target object stored in a gas storage tank is determined through a gas determination instrument, and the concentration of the target object in the gas to be determined is finally calculated and obtained, wherein the calculation formula is as follows: target concentration in the gas to be measured = (gas meter reading × gas storage tank volume)/(sampling flow at adsorption × predetermined adsorption time).
Further, in the desorption step, a desorption control valve and a power pump control valve are opened, a desorption power pump is opened, and the heating pipe heats the gas adsorption desorption pipe; in the determination step, after the gas desorption is carried out for a preset desorption time, the desorption control valve and the power pump control valve are closed, and the determination control valve is opened.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic structural diagram of a device for measuring the content of a low-concentration gas in flue gas according to an embodiment of the invention; and
FIG. 2 is a schematic view showing the structure of a gas adsorption-desorption tube according to an embodiment of the present invention; and
FIG. 3 is a schematic structural diagram of a device for measuring the content of low-concentration gases in flue gas according to another embodiment of the invention.
Wherein, 1 is a heater; 2 is a gas adsorption desorption pipe; 3 is a desorption control valve; 4 is a gas storage tank; 5 is a measuring control valve; 6 is a gas tester; 7 is a temperature detection unit; 8 is a temperature control unit; 9 is a sampling pump; 10 is a particulate blocking member; reference numeral 11 denotes a gas adsorbing member.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout; the embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes in detail a low concentration gas content measurement apparatus in flue gas according to an embodiment of the present invention with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a device for measuring the content of a low-concentration gas in flue gas according to an embodiment of the invention; and FIG. 2 is a schematic view of the structure of a gas adsorption-desorption tube according to an embodiment of the present invention.
As shown in fig. 1 and fig. 2, the apparatus for measuring the content of low-concentration gas in flue gas according to the embodiment of the present invention includes a gas adsorption and desorption tube 2, wherein a gas adsorption part 11 is filled in the gas adsorption and desorption tube 2; the heater 1 is arranged on the outer wall of the gas adsorption and desorption pipe 2; the sampling pump 9 is communicated with the outlet end of the gas adsorption and desorption pipe 2 through a sampling pipeline, and a sampling control valve 12 is installed on the sampling pipeline; the gas storage tank is characterized in that a gas inlet of the gas storage tank 4 is communicated with the outlet end of the gas adsorption and desorption pipe 2 through a storage pipeline, and a desorption control valve 3 is installed on the storage pipeline; the gas measuring instrument 6 is connected and communicated with a gas outlet of the gas storage tank 4 through a measuring pipeline; and a measurement control valve 5 is arranged on the measurement pipeline. .
According to the prior art in the background of the patent, at present, for the determination of the gas content with the concentration lower than the detection limit of a constant potential electrolysis method, the gas content is mainly determined by a spectrophotometry method from a measurement chamber after field sampling, so that the time and the labor are wasted, and the efficiency is lower; in the device for measuring the content of the low-concentration gas in the flue gas, in the gas adsorption process, the sampling control valve 12 is opened, the desorption control valve 3 is closed, the measurement control valve 5 is closed, the gas inlet end of the gas adsorption and desorption pipe 2 is inserted into a gas path to be measured, the sampling pump 9 provides power to enable the gas to be measured to enter the gas adsorption and desorption pipe 2, a target object in the gas is enriched through the gas adsorption part 11 in the gas adsorption and desorption pipe 2, so that the concentration of the target object is higher than the detection limit, and meanwhile, the particulate matter blocking parts 10 at the two ends of the gas adsorption and desorption pipe 2 block charged smoke dust particles from entering the gas adsorption and desorption pipe 2, so that the particles are prevented from entering the gas determinator 6 to protect the gas determinator 6; after the preset time of enrichment, the gas inlet end of the gas adsorption and desorption pipe 2 is closed, the sampling control valve 12 is closed, the desorption control valve 3 is opened, heating is carried out through the heating pipe, all the target objects enriched in the gas adsorption and desorption pipe 2 are desorbed and enter the gas storage tank 4, meanwhile, the temperature detection unit 7 detects the temperature of the outer wall of the gas adsorption and desorption pipe 2, the temperature control unit 8 controls the heating of the heater 1 according to the temperature detected by the detection unit, after the preset time of desorption, the desorption control valve 3 is closed, the determination control valve 5 is opened, the concentration of the target objects can be detected on site by using the gas determinator 6 and adopting a constant potential electrolysis method, and the measurement efficiency is greatly improved.
In addition, the device for measuring the content of the low-concentration gas in the flue gas according to the above embodiment of the invention may further have the following additional technical features:
according to an embodiment of the invention, the device for measuring the content of the low-concentration gas in the flue gas further comprises a temperature detection unit 7 for detecting the temperature of the outer wall of the gas adsorption and desorption pipe 2, wherein the temperature detection unit 7 is arranged on the outer wall of the gas adsorption and desorption pipe 2; and a temperature control unit 8 for controlling the temperature of the outer wall of the gas adsorption/desorption tube 2, wherein the temperature control unit 8 is connected with the temperature detection unit 7 and the heater 1.
According to an embodiment of the invention, the device for measuring the content of the low-concentration gas in the flue gas further comprises a desorption power pump 13 and a power pump control valve 14; the storage pipeline is sequentially provided with the desorption control valve 3, the desorption power pump 13 and the power pump control valve 14; the other end of the power pump control valve 14 is connected and communicated with the air inlet of the gas storage tank 4.
According to one embodiment of the invention, the power pump control valve 14 is a shut-off valve.
According to an embodiment of the present invention, the heater 1 includes a heating pipe which is fitted around the outside of the gas adsorption and desorption pipe 2; and the heating resistance wire is arranged in the pipe wall of the heating pipe.
According to one embodiment of the present invention, both ports of the gas adsorption-desorption tube 2 are covered with the particulate matter-blocking member 10.
According to one embodiment of the invention, the particulate blocking member 10 is a blocking member made of glass wool and/or quartz wool.
According to an embodiment of the present invention, the gas adsorbing member 11 is a gas adsorbing member 11 made of at least one adsorbing material selected from activated carbon, Na-type molecular sieves, ZSM-5, 13X, SAPO, Y-type molecular sieves, and the like.
According to an embodiment of the present invention, the particle size of the gas adsorption member 11 is 10 mesh to 40 mesh, preferably 20 mesh to 30 mesh.
According to an embodiment of the present invention, the gas adsorbing member 11 is an adsorbing member that is subjected to a high temperature roasting pretreatment and then dried and cooled, so as to improve the adsorption efficiency.
According to one embodiment of the invention, the roasting temperature is 400-600 ℃, and the roasting time is 1-3 h.
Preferably, the roasting temperature is 500 ℃ and the roasting time is 2 h.
Activating the gas adsorption element by baking; removing the water and other substances adsorbed on the surface of the gas adsorption component to release more adsorption sites for adsorbing the target component.
The gas adsorption component 11 can adsorb a target object, has a great adsorption effect on moisture, and can be well adapted to sampling with great smoke humidity.
The particle size and the baking temperature of the gas adsorption part 11 are set to improve the absorption efficiency of the gas adsorption part 11, so that the gas to be detected is prevented from entering the sampling pump 9.
According to one embodiment of the invention, the maximum heating temperature of the heater 1 is 600 ℃.
According to one embodiment of the present invention, the sampling control valve 12 is a stop valve, and the desorption control valve 3 is a check valve.
According to one embodiment of the present invention, the volume of the gas storage tank 4 is 100 mL-10L.
According to one embodiment of the invention, the gas meter 6 is a direct-reading gas meter.
According to one embodiment of the invention, the metering control valve 5 is a check valve.
According to another aspect of the present invention, there is also provided a low concentration gas concentration detection method based on the apparatus for measuring the content of low concentration gas in flue gas, including the following steps:
a gas adsorption step, wherein a sampling control valve 12 is opened, and a desorption control valve 3 and a determination control valve 5 are closed; the sampling pump 9 provides power to make the gas to be detected enter the gas adsorption desorption pipe 2;
a desorption step, wherein after the gas adsorption is carried out for a preset adsorption time, the gas inlet end of the gas adsorption and desorption pipe 2 is closed, the sampling control valve 12 is closed, the desorption control valve 3 is opened, the heating pipe heats the gas adsorption and desorption pipe 2, the temperature detection unit 7 detects the temperature of the outer wall of the gas adsorption and desorption pipe 2, and the temperature control unit 8 controls the heating of the heater 1 according to the temperature detected by the detection unit;
in the determination step, after the gas desorption is carried out for a preset desorption time, the desorption control valve 3 is closed, the determination control valve 5 is opened, the concentration of the target substance stored in the gas storage tank 4 is determined through the gas determination instrument 6, and the concentration of the target substance in the gas to be determined is finally calculated and obtained, wherein the calculation formula is as follows: target concentration in the gas to be measured = (gas meter reading × gas storage tank volume)/(sampling flow at adsorption × predetermined adsorption time).
According to an embodiment of the present invention, in the desorption step, the desorption control valve 3 and the power pump control valve 14 are opened, the desorption power pump 13 is opened, and the gas adsorption desorption pipe 2 is heated by the heating pipe; in the determination step, after the preset desorption time, the desorption control valve 3 and the power pump control valve 14 are closed, and the determination control valve 5 is opened.
The specific test examples and comparative examples were made as follows:
the first test example: the measured concentration is 1.0mg/m3Nitric oxide standard gas of (2).
Sample adsorption: a20-mesh 13X molecular sieve is adopted as a gas adsorption part 11, the flow rate entering a gas adsorption and desorption pipe 2 is controlled to be 10mL/min through a sampling pump 9, and the preset adsorption time is 4 min.
Sample desorption: the temperature of the outer wall of the gas adsorption and desorption pipe 2 is controlled to be 500 ℃, the preset desorption time is 2min, and the volume of the gas storage tank 4 is 10 mL.
And (3) sample testing: the gas meter 6 reads 4mg/m3。
Sample results: calculated, the original concentration gas is 1.0mg/m3。
And (4) conclusion: the above test examples show that the device and the method for measuring the content of the low-concentration gas in the flue gas can quickly and accurately measure the content of the low-concentration nitric oxide gas.
Comparative example one: the moisture content is measured to be 25 percent (simulated smoke sampling) and the concentration is 100mg/m3Sulfur dioxide standard gas of (2).
Collecting samples: the above sulfur dioxide standard gas was collected at the same flow rate for the same time in the formaldehyde buffer solution absorption tube (collecting 4min at 100 mL/min) and in the gas content measuring apparatus of the present invention (collecting 4min at 100 mL/min; using Y-type molecular sieve for gas adsorption part 11, the volume of gas storage tank 4 was 100 mL), respectively.
And (3) sample testing: (1) the sample is measured by adopting the method in the fifth chapter (first) of formaldehyde buffer solution absorption-pararosaniline hydrochloride spectrophotometry in air and waste gas monitoring and analyzing method (fourth edition supplement); (2) the gas content measuring device of the invention is adopted: controlling the outer wall temperature of the gas adsorption and desorption pipe 2 at 500 ℃ during desorption, and setting the desorption time to be 1 min; and a direct-reading gas tester is adopted for detection.
Sample results: (1) the result of spectrophotometry of absorption of formaldehyde buffer solution and pararosaniline hydrochloride is 85.0mg/m3(ii) a (2) The measurement result of the gas content measuring equipment using the scheme is 98mg/m3。
And (4) conclusion: the device and the method for measuring the content of the low-concentration gas in the flue gas can collect the flue gas with high humidity, and the measurement result is accurate.
Comparative example two:
na type molecular sieve, ZSM-5, 13X, Y type 4 different adsorbing materials were used as the gas adsorbing member 11 (the same measuring conditions were used), and the concentration was 100mg/m3The nitric oxide standard gas of (2) was measured, and the measurement results are shown in table 1:
TABLE 1 detection results of nitric oxide determination with different adsorption materials
| Name of adsorbent Material | Na type molecular sieve | ZSM-5 | 13X | Y type |
| Test result (mg/m 3) | 93 | 95 | 100 | 98 |
And (4) conclusion: as can be seen from table 1, the nitric oxide concentration measured using 13X as the gas adsorbing member 11 was most accurate.
Comparative example three:
the gas adsorption member 11 was a 13X molecular sieve of 4 kinds of specifications of 10 mesh, 20 mesh, 30 mesh and 40 mesh, respectively, and the concentration was 1.0mg/m measured under the same conditions3Nitric oxide standard gas of (1); the results are calculated and shown in table 2:
table 2 detection results of nitric oxide determination using molecular sieves of different specifications
| | 10 mesh | 20 mesh | 30 mesh | 40 mesh |
| Measurement result (mg/m)3） | 0.75 | 1.0 | 1.0 | 0.75 |
And (4) conclusion: as can be seen from table 2, the nitric oxide concentrations measured using 20 mesh and 30 mesh 13X as the gas adsorbing member 11 were the most accurate.
Comparative example four: adopting a 20-mesh 13X molecular sieve as a gas adsorption component, respectively roasting the gas adsorption component for 1h at 400 ℃, 500 ℃ and 600 ℃, and measuring nitric oxide standard gas with the concentration of 1.0mg/m3 under the same measurement conditions; the results are calculated and shown in Table 3:
TABLE 3 detection results of NO in 13X molecular sieve after different roasting temperatures
| Temperature of calcination | 400 degree | 500 degree | 600 degree |
| Measurement result (mg/m)3） | 0.75 | 1.0 | 0.5 |
And (4) conclusion: as can be seen from table 3, the nitric oxide concentration measured using the 500 degree baked 13X as the gas adsorbing member 11 was the most accurate.
Comparative example five: adopting a 20-mesh 13X molecular sieve as a gas adsorption component, respectively roasting three parts of the same gas adsorption component for 1h, 2h and 3h at 500 ℃, and measuring nitric oxide standard gas with the concentration of 1.0mg/m3 under the same measurement conditions; the results are calculated and shown in Table 4:
TABLE 4 detection results of NO in 13X molecular sieve after different roasting time treatment
| Time of calcination | 1h | 2h | 3h |
| Measurement result (mg/m)3） | 0.75 | 1.0 | 0.75 |
And (4) conclusion: as can be seen from table 4, 13X with a 2h firing time was the most accurate as the nitric oxide concentration measured by the gas adsorbing member 11.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific 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, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A low concentration gas content measuring device in flue gas, characterized by includes: the gas adsorption and desorption pipe is filled with a gas adsorption component; a heater disposed on an outer wall of the gas adsorption and desorption pipe; the sampling pump is communicated with the outlet end of the gas adsorption and desorption pipe through a sampling pipeline, and a sampling control valve is installed on the sampling pipeline; the gas storage tank is characterized in that a gas inlet of the gas storage tank is communicated with the outlet end of the gas adsorption and desorption pipe through a storage pipeline, and a desorption control valve is installed on the storage pipeline; the gas measuring instrument is connected and communicated with a gas outlet of the gas storage tank through a measuring pipeline; and a measurement control valve is arranged on the measurement pipeline.
2. The device for measuring the content of the low-concentration gas in the flue gas according to claim 1, further comprising a temperature detection unit for detecting the temperature of the outer wall of the gas adsorption and desorption pipe, wherein the temperature detection unit is arranged on the outer wall of the gas adsorption and desorption pipe; and the temperature control unit is used for controlling the temperature of the outer wall of the gas adsorption and desorption pipe, and is connected with the temperature detection unit and the heater.
3. The device for measuring the content of the low-concentration gas in the flue gas according to claim 1, wherein the heater comprises a heating pipe, and the heating pipe is sleeved outside the gas adsorption and desorption pipe; and the heating resistance wire is arranged in the pipe wall of the heating pipe.
4. The apparatus for measuring the content of low-concentration gas in flue gas according to claim 1, wherein two ports of the gas adsorption and desorption pipe are covered with a particulate blocking member.
5. The apparatus of claim 4, wherein the particulate blocking member is a blocking member made of glass wool and/or quartz wool.
6. The apparatus according to claim 1, wherein the gas adsorbing member is made of at least one adsorbing material selected from activated carbon, Na-type molecular sieves, ZSM-5, 13X, SAPO, Y-type molecular sieves, etc.
7. The apparatus according to claim 1, wherein the particle size of the gas adsorbing member is 10-40 mesh.
8. The device for measuring the content of the low-concentration gas in the flue gas as claimed in claim 1, wherein the gas adsorption component is an adsorption component which is subjected to high-temperature roasting pretreatment and then is subjected to drying and cooling.
9. The apparatus according to claim 8, wherein the gas meter is a direct-reading gas meter.
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