CN112162068A - Sulfur trioxide sampling test system and method for absorbing and removing sulfur dioxide interference by adopting isopropanol - Google Patents
Sulfur trioxide sampling test system and method for absorbing and removing sulfur dioxide interference by adopting isopropanol Download PDFInfo
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- CN112162068A CN112162068A CN202011248410.XA CN202011248410A CN112162068A CN 112162068 A CN112162068 A CN 112162068A CN 202011248410 A CN202011248410 A CN 202011248410A CN 112162068 A CN112162068 A CN 112162068A
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- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 title claims abstract description 122
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 title claims abstract description 93
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 238000005070 sampling Methods 0.000 title claims abstract description 31
- 238000012360 testing method Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims description 28
- 239000007789 gas Substances 0.000 claims abstract description 127
- 238000010521 absorption reaction Methods 0.000 claims abstract description 74
- 239000007788 liquid Substances 0.000 claims abstract description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 238000010998 test method Methods 0.000 claims abstract description 6
- 239000003546 flue gas Substances 0.000 claims description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 8
- 238000011065 in-situ storage Methods 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 239000002440 industrial waste Substances 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance 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
- 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
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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
- G01N1/02—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
-
- 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
-
- 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
- G01N33/0006—Calibrating gas analysers
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
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Abstract
The invention discloses a sulfur trioxide sampling test system and a sulfur trioxide sampling test method for absorbing by using isopropanol and removing sulfur dioxide interference, wherein a sulfur dioxide standard gas is filled in a first gas cylinder, a pure nitrogen standard gas is filled in a second gas cylinder, isopropanol absorption liquid is filled in the absorption cylinder, an outlet of the first gas cylinder is communicated with an inlet of a gas mixing device through a first flowmeter, an outlet of the second gas cylinder is connected with an inlet of the gas mixing device through a second flowmeter and passes through, one end of a first connecting pipeline is communicated with an outlet of the gas mixing device, the other end of the first connecting pipeline is inserted into the isopropanol absorption liquid in the absorption cylinder, and a gas outlet is formed in the top of the absorption cylinder.
Description
Technical Field
The invention belongs to the technical field of sulfur trioxide measurement in industrial waste gas, and relates to a sulfur trioxide sampling test system and method for absorbing and removing sulfur dioxide interference by using isopropanol.
Background
With the gradual implementation of ultralow emission standards of atmospheric pollutants in the coal-fired industry in China, the emission of conventional pollutants in industrial waste gas is effectively controlled, and the harm of unconventional pollutants discharged into the atmosphere to the environment is gradually highlighted, so that the emission of unconventional pollutants in the industrial waste gas is gradually paid attention to. Sulfur trioxide, one of the unconventional pollutants, is far more harmful than sulfur dioxide, both to production equipment and to the atmospheric environment. The sulfur trioxide can not only cause equipment corrosion and air preheater blockage, but also increase the opacity of the discharged flue gas to form colored smoke plume. In the atmosphere, sulfur trioxide is a major constituent of secondary aerosols and is also a major cause of acid rain. Therefore, controlling the emission of sulfur trioxide in industrial waste gas is of great significance for improving the quality of atmosphere. Currently, a condensation control method and an isopropyl alcohol absorption method are main sampling and testing methods for sulfur trioxide at home and abroad, wherein the isopropyl alcohol absorption method is also a sampling and testing method recommended by developed countries such as American EPA, Japanese JIS and the like. However, the isopropyl alcohol absorption method is susceptible to various factors during the sampling and testing process, wherein the oxidizing substances in the isopropyl alcohol solution can oxidize the sulfur dioxide gas in the exhaust gas into sulfur trioxide, thereby causing serious interference and influence on the sampling and testing results, and finally causing the distortion of the testing results.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a sulfur trioxide sampling test system and a sulfur trioxide sampling test method for absorbing and removing sulfur dioxide interference by using isopropanol, and the system and the method can improve the accuracy of on-site sulfur trioxide test.
In order to achieve the purpose, the sulfur trioxide sampling test system adopting isopropanol to absorb and remove sulfur dioxide interference comprises a first gas cylinder, a second gas cylinder, a first flowmeter, a second flowmeter, a gas mixing device, an ice bath and an absorption bottle, wherein sulfur dioxide standard gas is filled in the first gas cylinder, pure nitrogen standard gas is filled in the second gas cylinder, isopropanol absorption liquid is filled in the absorption bottle, an outlet of the first gas cylinder is communicated with an inlet of the gas mixing device through the first flowmeter, an outlet of the second gas cylinder is connected with an inlet of the gas mixing device through the second flowmeter, one end of a first connecting pipeline is communicated with an outlet of the gas mixing device, the other end of the first connecting pipeline is inserted into the isopropanol absorption liquid in the absorption bottle, and a gas outlet is formed in the top of the absorption bottle.
The absorption bottle also comprises a second connecting pipeline, wherein the second connecting pipeline is communicated with a gas outlet at the top of the absorption bottle.
The first connecting pipeline and the second connecting pipeline are both polytetrafluoroethylene pipes.
A sulfur trioxide sampling test method for absorbing and removing sulfur dioxide interference by adopting isopropanol comprises the following steps:
the method comprises the steps that sulfur dioxide standard gas output by a first gas cylinder enters a gas mixing device through a first gas flowmeter, pure nitrogen standard gas output by a second gas cylinder enters the gas mixing device through a second gas flowmeter, mixed gas output by the gas mixing device is absorbed by an absorption bottle containing isopropanol absorption liquid and then discharged to the atmosphere, wherein the absorption bottle is positioned in an ice bath, the isopropanol absorption liquid in the absorption bottle is the same as the isopropanol absorption liquid adopted in the field sampling and testing process, and the influence value c of the sulfur dioxide gas on an isopropanol absorption method is calculated according to the gas flow measured by the first gas flowmeter, the gas flow measured by the second gas flowmeter and the concentration of sulfate radicals in the isopropanol absorption liquid2；
Measurement of sulfur trioxide concentration c using in situ isopropanol absorption1And then the influence value c of the sulfur dioxide gas on the isopropanol absorption method is utilized2Measurement of sulfur trioxide concentration c for in situ isopropanol absorption1Correcting to obtain the concentration of sulfur trioxide in the corrected flue gas
The sulfur trioxide concentration in the corrected flue gas
Comprises the following steps:
the invention has the following beneficial effects:
the sulfur trioxide sampling test system and the method for absorbing by using the isopropanol and removing the interference of the sulfur dioxide are characterized in that during specific operation, a standard gas with the same sulfur dioxide concentration in a sampling gas when sampling and testing the sulfur trioxide in industrial waste gas by using an isopropanol absorption method on site is prepared in a laboratory, then the influence value of the sulfur dioxide gas on the isopropanol absorption method is measured and calculated, and then the influence value of the sulfur dioxide gas on the isopropanol absorption method is utilized to measure the sulfur trioxide concentration c by using the isopropanol absorption method on site1The method has the advantages that correction is carried out to accurately obtain the concentration of sulfur trioxide in the flue gas, so that the test result of sulfur trioxide in industrial waste gas by an isopropanol absorption method is more accurate and stable, the operation is convenient, and the practicability is extremely strong.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a first gas cylinder, 2 is a second gas cylinder, 31 is a first gas flow meter, 32 is a second gas flow meter, 4 is a gas mixing device, 5 is an absorption bottle, and 6 is an ice bath.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the sulfur trioxide sampling test system adopting isopropanol to absorb and remove sulfur dioxide interference, provided by the invention, comprises a first gas cylinder 1, a second gas cylinder 2, a first flowmeter, a second flowmeter, a gas mixing device 4, an ice bath 6 and an absorption cylinder 5, wherein a sulfur dioxide standard gas is filled in the first gas cylinder 1, a pure nitrogen standard gas is filled in the second gas cylinder 2, an isopropanol absorption liquid is filled in the absorption cylinder 5, an outlet of the first gas cylinder 1 is communicated with an inlet of the gas mixing device 4 through the first flowmeter, an outlet of the second gas cylinder 2 is communicated with an inlet of the gas mixing device 4 through the second flowmeter, one end of a first connecting pipeline is communicated with an outlet of the gas mixing device 4, the other end of the first connecting pipeline is inserted into the isopropanol absorption liquid in the absorption cylinder 5, and a gas outlet is formed in the top of the absorption cylinder 5.
The invention also comprises a second connecting pipeline, wherein the second connecting pipeline is communicated with the gas outlet at the top of the absorption bottle 5.
The first connecting pipeline and the second connecting pipeline are both polytetrafluoroethylene pipes.
The sulfur trioxide sampling test method for absorbing and removing sulfur dioxide interference by adopting isopropanol comprises the following steps of:
the sulfur dioxide standard gas output by the first gas bottle 1 enters the gas mixing device 4 through the first gas flowmeter 31, the pure nitrogen standard gas output by the second gas bottle 2 enters the gas mixing device 4 through the second gas flowmeter 32, the mixed gas output by the gas mixing device 4 is absorbed by the absorption bottle 5 filled with isopropanol absorption liquid and then discharged to the atmosphere, wherein the absorption bottle 5 is positioned in the ice bath 6, the isopropanol absorption liquid in the absorption bottle 5 is the same as the isopropanol absorption liquid adopted in the field sampling and testing process, and the influence value c of the sulfur dioxide gas on the isopropanol absorption method is calculated according to the gas flow measured by the first gas flowmeter 31, the gas flow measured by the second gas flowmeter 32 and the concentration of sulfate radicals in the isopropanol absorption liquid2；
Measurement of sulfur trioxide concentration c using in situ isopropanol absorption1And then the influence value c of the sulfur dioxide gas on the isopropanol absorption method is utilized2Measurement of sulfur trioxide concentration c for in situ isopropanol absorption1Correcting to obtain the concentration of sulfur trioxide in the corrected flue gas
Comprises the following steps:
example one
The method takes the test of sulfur trioxide in the outlet flue gas of a 300MW unit limestone-gypsum wet flue gas desulfurization system of a certain coal-fired power plant as an example. Through field measurement, the average value of the concentration of sulfur dioxide in the flue gas at the outlet of the absorption tower of the desulfurization system is 15mg/m3(Standard, dry, actual O)2). At the same time, the same test site is subjected to an isopropanol absorption methodThe flue gas is placed for sampling test, the sampling volume of the flue gas is 120L, the sampling time is 30min, and the average value of the concentration of sulfur trioxide obtained after the test analysis is 8mg/m3(Standard, dry, actual O)2),. The high-concentration sulfur dioxide standard gas and the high-purity nitrogen standard gas are prepared in a laboratory through a gas flowmeter and a gas mixing device 4 to be the same as the sulfur dioxide concentration (15 mg/m) in the field sampling waste gas3(Standard, dry, actual O)2) Mixed gas with the same flow rate (4L/min). Introducing the prepared mixed gas into an absorption bottle 5 containing 80% isopropanol absorption liquid, and stopping introducing gas after absorbing for 30 min. Analyzing the sulfate radical concentration in the isopropanol absorption liquid, and calculating the influence value c of sulfur dioxide in the gas on the sulfur trioxide test value according to the sampled gas volume2. Through analysis and calculation, c2Is 3mg/m3(Standard, dry, actual O)2). The sulfur trioxide concentration test result corrected and calculated by the method is cSO3Is 5mg/m3(Standard, dry, actual O)2) From this test data, the effect of the presence of sulfur dioxide gas in the flue gas on the sulfur trioxide test results was significant.
Claims (6)
1. The sulfur trioxide sampling test system is characterized by comprising a first gas cylinder (1), a second gas cylinder (2), a first flowmeter, a second flowmeter, a gas mixing device (4), an ice bath (6) and an absorption bottle (5), wherein sulfur dioxide standard gas is filled in the first gas cylinder (1), pure nitrogen standard gas is filled in the second gas cylinder (2), isopropanol absorption liquid is filled in the absorption bottle (5), an outlet of the first gas cylinder (1) is communicated with an inlet of the gas mixing device (4) through the first flowmeter, an outlet of the second gas cylinder (2) is connected with an inlet of the gas mixing device (4) through the second flowmeter and passes through, one end of a first connecting pipeline is communicated with an outlet of the gas mixing device (4), and the other end of the first connecting pipeline is inserted into the isopropanol absorption liquid in the absorption bottle (5), the top of the absorption bottle (5) is provided with a gas outlet.
2. The sulfur trioxide sampling test system for absorbing and removing sulfur dioxide interference by using isopropanol as claimed in claim 1, further comprising a second connecting pipeline, wherein the second connecting pipeline is communicated with a gas outlet at the top of the absorption bottle (5).
3. The sulfur trioxide sampling test system for absorbing and removing sulfur dioxide interference with isopropanol as in claim 2, wherein the first connecting line is a polytetrafluoroethylene tube.
4. The sulfur trioxide sampling test system for absorbing and removing sulfur dioxide interference with isopropanol as in claim 2, wherein the second connecting line is a polytetrafluoroethylene tube.
5. A sulfur trioxide sampling test method for absorbing and removing sulfur dioxide interference by adopting isopropanol is characterized by comprising the following steps of:
the sulfur dioxide standard gas output by the first gas bottle (1) enters a gas mixing device (4) through a first gas flow meter (31), pure nitrogen standard gas output by the second gas bottle (2) enters the gas mixing device (4) through the second gas flowmeter (32), the mixed gas output by the gas mixing device (4) is absorbed by an absorption bottle (5) filled with isopropanol absorption liquid and then is discharged into the atmosphere, wherein the absorption bottle (5) is positioned in the ice bath (6), the isopropanol absorption liquid in the absorption bottle (5) is the same as the isopropanol absorption liquid adopted in the field sampling and testing process, and calculating the influence value c of the sulfur dioxide gas on the isopropanol absorption method according to the gas flow measured by the first gas flow meter (31), the gas flow measured by the second gas flow meter (32) and the concentration of sulfate radicals in the isopropanol absorption liquid.2；
Measurement of sulfur trioxide concentration c using in situ isopropanol absorption1And then the influence value c of the sulfur dioxide gas on the isopropanol absorption method is utilized2Measurement of sulfur trioxide concentration c for in situ isopropanol absorption1Correcting to obtain the concentration of sulfur trioxide in the corrected flue gas
6. The sulfur trioxide sampling test method of claim 5 using isopropanol to absorb and remove sulfur dioxide interference, wherein the sulfur trioxide concentration in the corrected flue gas is
Comprises the following steps:
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324756A (en) * | 2021-12-28 | 2022-04-12 | 太原理工大学 | Online real-time measurement device and method for preparing sulfur trioxide gas through sulfur dioxide oxidation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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