CN110806390A - Low-concentration sulfur trioxide gas online measurement device and method - Google Patents
Low-concentration sulfur trioxide gas online measurement device and method Download PDFInfo
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- CN110806390A CN110806390A CN201911051323.2A CN201911051323A CN110806390A CN 110806390 A CN110806390 A CN 110806390A CN 201911051323 A CN201911051323 A CN 201911051323A CN 110806390 A CN110806390 A CN 110806390A
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- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 title claims abstract description 198
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005259 measurement Methods 0.000 title claims abstract description 19
- 230000003287 optical effect Effects 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000012937 correction Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 26
- 239000002253 acid Substances 0.000 claims description 14
- 239000003595 mist Substances 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 229910052732 germanium Inorganic materials 0.000 claims description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 claims 5
- 230000008859 change Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 26
- 239000003546 flue gas Substances 0.000 description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 8
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L sulfate group Chemical group S(=O)(=O)([O-])[O-] QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 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
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- 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
- G01N1/44—Sample treatment involving radiation, e.g. heat
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a low-concentration sulfur trioxide gas online measuring device and a method, which comprises a water container and an optical detection pool, and further comprises the following steps: atomizing sulfur trioxide; step two: optical measurement; step three: zero point correction and recording are carried out, and the beneficial effects of the invention are as follows: first of all, sulfur trioxide is converted into SO by a simple structure3∙H2O, subsequently in SO according to a UV beam3∙H2Determining SO by detecting the change of light intensity3∙H2The concentration content of O realizes the characteristics of simple structure, convenient use, accurate measurement and continuous on-line monitoring.
Description
Technical Field
The invention relates to the technical field of sulfur trioxide detection, in particular to a low-concentration sulfur trioxide gas online measurement device and method.
Background
The flue gas of coal-fired power plants and industrial boilers usually contains SO3, SO3 is one of the main causes of acid rain, and is also one of the important sources of PM2.5 in the atmosphere because the flue gas is easy to form submicron aerosol and further form secondary sulfate particles, and since 2015, the emission concentration limit of SO3 of the coal-fired boiler is continuously set to 5mg/m3 by relevant environmental protection departments at home. The alkali agent is injected by part of power plants to reduce the concentration of SO3 in the flue gas, the concentration of SO3 is greatly influenced by load, and the concentration of SO3 directly determines the injection amount of the alkali agent. In addition, SO3 can cause flue corrosion, and NH4HSO4 which is combined with NH3 and H2O to generate cohesiveness can also cause problems of SCR deactivation, air preheater blockage and the like. Particularly, under the policy requirement of ultralow emission of coal-fired flue gas in China, in order to improve the removal efficiency of NOX, the retention time of the flue gas in SCR is prolonged, and the conversion rate of SO2 to SO3 in SCR is further increased. Therefore, the accurate measurement technology of the SO3 in the flue gas is increasingly emphasized.
Currently, the most common SO3 detection methods are the controlled condensation method and the isopropyl alcohol method. The condensation control method is generally regarded as a relatively accurate method, however, the condensation control method is complex in system, and the temperature needs to be controlled in both the heating process and the cooling process. In addition, the controlled condensation method is not a real-time measurement technology, and the detection of sulfate ions is time-consuming and labor-consuming. Although the isopropyl alcohol method can absorb SO3, it also absorbs part of SO2, which increases the sulfate ion concentration in the solution, creating a positive bias.
Various techniques have been developed in the art for measuring the concentration of SO3 in flue gases. The utility model discloses a utility patent for 200620163937.1 discloses a sampling device of SO3 in flue gas, including dust removal mechanism, sampling pipe, spiral collecting pipe and suction mechanism, wherein dust removal mechanism installs the entry end at the sampling pipe, and the exit end of this sampling pipe passes through the access connection of pipeline with spiral collecting pipe, and spiral collecting pipe advances, the export all is located spiral upper end, its export through the silica gel hose with suction mechanism communicates with each other. There is no measurement part in the patent and online measurement cannot be realized.
Patent No. 20091021169.1 discloses a method and apparatus for detecting, measuring and controlling SO3 and other condensables in flue gas, which can measure the concentration of multiple condensables, but the method has high material accuracy requirements and cannot realize continuous measurement on line.
Disclosure of Invention
The invention aims to provide an online measuring device and method for low-concentration sulfur trioxide gas, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a low concentration sulfur trioxide gaseous on-line measuring device, includes water container, its characterized in that: the bottom of the water container is provided with a heater, the inlet of the water container is connected with sampling gas, the outlet of the water container is connected with a controllable three-way valve, the other two ports of the controllable three-way valve are respectively connected with an air interface and an optical measuring tank, the optical measuring tank is of a straight-through structure, heating windows are arranged on the left side and the right side of the tank body, and an ultraviolet light emitter and an ultraviolet light receiver are arranged on the outer side of each heating window.
Preferably, the ultraviolet light receiver is further provided with an optical signal detector, the detector specifically adopts a germanium photodiode as a detection element, and the operating wavelength of the optical signal detector is between 300 and 1500 nm.
Preferably, the heating window, the heater and the controllable three-way valve are all controlled by a controller.
An on-line measuring method of low-concentration sulfur trioxide gas comprises the following steps:
the method comprises the following steps: using a container as a carrier, charging water, heating the container, combining the heated steam with dry or incompletely dry sulfur trioxide gas from a process sample, and combining sulfur trioxide with the steam to form SO3∙H2O state, conversion of sulfur trioxide to acid mist (SO)3∙H2O) purpose;
step two: atomized SO3∙H2The O gas enters the optical measuring cell through the controllable three-way valve, then the concentration of the sulfur trioxide is observed through the observation window, and the optical measuring cell performs the concentration measurement of the sulfur trioxide;
step three: zero point corrected and recorded.
Setting the flow of the sampling gas of sulfur trioxide in the first step, and then measuring and controlling the flow of the sulfur trioxide through a controller to enable the flow of the sampling gas of the sulfur trioxide to be on a set value;
the evaporation amount of the water vapor in the first step is realized by controlling the temperature of the water in the container, the amount of the water vapor is increased when the temperature is increased, the amount of the water vapor is reduced when the temperature is reduced, and the temperature of the water in the container is realized by controlling the heater through the controller.
Preferably, the error range of the sulfur trioxide flow control precision is not more than 1%, and the error range of the heater temperature control is not more than 0.5 ℃.
In the second step, the optical measuring cell specifically performs measurement through the following steps:
s1, the ultraviolet light emitter emits ultraviolet light beams, and when the ultraviolet light beams pass through the optical measuring cell containing atomized sulfur trioxide, the light intensity of the ultraviolet light beams is reduced;
s2: the ultraviolet light beam with the reduced light intensity is received by an ultraviolet receiver and is measured and converted into an electric signal;
s3: the electric signal is calculated by Lambert-beer law to obtain the concentration of sulfur trioxide.
The zero point is a numerical value calculated by an electric signal received by the ultraviolet receiver when sulfur trioxide acid mist does not exist in the optical measuring cell, and the specific method for zero point correction in the third step is as follows:
a. injecting clean air into the optical measuring cell by the controllable three-way valve and closing a connecting port of the sulfur trioxide acid mist and the optical measuring cell;
b. the ultraviolet emitter continues to emit light beams, then the ultraviolet receiver receives the light beams, the light intensity does not decrease at the moment, and a new electric signal is obtained;
d. a new value is calculated from the new electrical signal and recorded.
Preferably, the number of times of zero point correction in the third step may be set once per month.
Compared with the prior art, the invention has the beneficial effects that: the invention firstly oxidizes the ozone by a simple structureConversion of sulfur to SO3∙H2O, subsequently in SO according to a UV beam3∙H2Determining SO by detecting the change of light intensity3∙H2The concentration content of O realizes the characteristics of simple structure, convenient use, accurate measurement and continuous on-line monitoring.
Drawings
FIG. 1 is a diagram of an optical detection circuit according to the present invention;
FIG. 2 is a schematic view of the structure of the present invention.
In the figure: the device comprises a water container 1, a heater 2, a controllable three-way valve 3, an optical measuring cell 4, a heating window 5, an ultraviolet light emitter 6, an ultraviolet light receiver 7 and a controller 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: an on-line measuring device of low-concentration sulfur trioxide gas comprises a water container 1, a heater 2 is arranged at the bottom of the water container 1, the inlet of the water container 1 is connected with the sampling gas, the outlet of the water container 1 is connected with the controllable three-way valve 3, the other two ports of the controllable three-way valve 3 are respectively connected with an air interface and an optical measuring cell 4, the optical measuring tank 4 is a straight-through structure, heating windows 5 are arranged on the left side and the right side of the tank body, an ultraviolet light emitter 6 and an ultraviolet light receiver 7 are arranged on the outer sides of the heating windows 5, the heating window 5 is heated to a temperature above 100 deg.c, which is greater than the dew point of the acid mist of sulfur trioxide, therefore, no sulfur trioxide acid mist is separated out on the heating window 5, no influence is caused on the light transmittance of the ultraviolet light beam, and the controller 8 is connected with the heating window 5, the heater 2 and the controllable three-way valve 3 in a control mode.
It should be noted that an optical signal detector is further disposed between the ultraviolet light receiver 7 and the controller 8, the detector specifically uses a germanium photodiode as a detection element, and the operating wavelength of the optical signal detector is between 300nm and 1500 nm.
An on-line measuring method of low-concentration sulfur trioxide gas comprises the following steps:
the method comprises the following steps: using a container as a carrier, charging water, heating the container, combining the heated steam with dry or incompletely dry sulfur trioxide gas from a process sample, and combining sulfur trioxide with the steam to form SO3∙H2O state, conversion of sulfur trioxide to acid mist (SO)3∙H2O) purpose;
step two: atomized SO3∙H2The O gas enters the optical measuring cell through the controllable three-way valve, then the concentration of the sulfur trioxide is observed through the observation window, and the optical measuring cell performs the concentration measurement of the sulfur trioxide;
step three: zero point corrected and recorded.
It is noted that, in the first step, the flow rate of the sampling gas of sulfur trioxide is set, and then the flow rate of sulfur trioxide is measured and controlled by the controller, so that the flow rate of the sampling gas of sulfur trioxide is at the set value;
the evaporation amount of the water vapor in the first step is realized by controlling the temperature of the water in the container, the amount of the water vapor is increased when the temperature is increased, the amount of the water vapor is reduced when the temperature is reduced, and the temperature of the water in the container is realized by controlling the heater through the controller.
Wherein, the error range of the sulfur trioxide flow control precision is not more than 1%, and the error range of the heater temperature control is not more than 0.5 ℃.
In the second step, the optical measuring cell specifically performs measurement through the following steps:
s1, the ultraviolet light emitter emits ultraviolet light beams, and when the ultraviolet light beams pass through the optical measuring cell containing atomized sulfur trioxide, the light intensity of the ultraviolet light beams is reduced;
s2: the ultraviolet light beam with the reduced light intensity is received by an ultraviolet receiver and is measured and converted into an electric signal;
s3: the electric signal is calculated by Lambert-beer law to obtain the concentration of sulfur trioxide.
The zero point is a numerical value calculated by an electric signal received by the ultraviolet receiver when sulfur trioxide acid mist does not exist in the optical measuring cell, and the specific method for zero point correction in the third step is as follows:
a. injecting clean air into the optical measuring cell by the controllable three-way valve and closing a connecting port of the sulfur trioxide acid mist and the optical measuring cell;
b. the ultraviolet emitter continues to emit light beams, then the ultraviolet receiver receives the light beams, the light intensity does not decrease at the moment, and a new electric signal is obtained;
d. a new value is calculated from the new electrical signal and recorded.
The number of times of zero point correction in the third step may be set once per month.
The first embodiment is as follows:
setting a gas flow of sulfur trioxide, heating a heater, mixing the sulfur trioxide and water vapor together to form a sulfur trioxide acid mist, namely SO3∙H2And O, filling the sulfur trioxide acid mist into an optical detection cell, converting the optical detection cell into an electric signal according to the change of light intensity, and finally calculating the electric signal through an optical signal detector, wherein the calculation mode specifically adopts the Lambert-beer law.
It is worth noting that as the time for introducing the sulfur trioxide acid mist increases, the zero point of the measurement will drift, and therefore, the zero point needs to be corrected again.
Example two:
and 10mg/s of sulfur trioxide gas is introduced, the heating temperature of the heater is 100 ℃, and the working wavelength of the optical signal detector is 300 nm.
Example three:
the heating temperature of the heater is 110 ℃ when the sulfur trioxide gas is introduced at 12mg/s, wherein the working wavelength of the optical signal detector is 350 nm.
Example four:
15mg/s of sulfur trioxide gas is introduced, the heating temperature of the heater is 120 ℃, and the working wavelength of the optical signal detector is 340 nm.
Example five:
15mg/s of sulfur trioxide gas is introduced, the heating temperature of the heater is 110 ℃, and the working wavelength of the optical signal detector is 360 nm.
Example six:
35mg/s of sulfur trioxide gas is introduced, the heating temperature of the heater is 150 ℃, and the working wavelength of the optical signal detector is 1340 nm.
Example seven:
30mg/s of sulfur trioxide gas is introduced, the heating temperature of the heater is 160 ℃, and the working wavelength of the optical signal detector is 1000 nm.
Example eight:
70mg/s of sulfur trioxide gas is introduced, the heating temperature of the heater is 200 ℃, and the working wavelength of the optical signal detector is 1500 nm.
Example nine:
the heating temperature of the heater is 180 ℃ when 52mg/s of sulfur trioxide gas is introduced, wherein the working wavelength of the optical signal detector is 1314 nm.
Example ten:
55mg/s of sulfur trioxide gas is introduced, the heating temperature of the heater is 1750 ℃, and the working wavelength of the optical signal detector is 1200nm
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a low concentration sulfur trioxide gaseous on-line measuring device, includes water container, its characterized in that: the bottom of the water container is provided with a heater, the inlet of the water container is connected with sampling gas, the outlet of the water container is connected with a controllable three-way valve, the other two ports of the controllable three-way valve are respectively connected with an air interface and an optical measuring tank, the optical measuring tank is of a straight-through structure, heating windows are arranged on the left side and the right side of the tank body, and an ultraviolet light emitter and an ultraviolet light receiver are arranged on the outer side of each heating window.
2. The on-line measuring device of low-concentration sulfur trioxide gas according to claim 1, characterized in that: the ultraviolet light receiver is further provided with an optical signal detector, the detector specifically adopts a germanium photodiode as a detection element, and the working wavelength of the optical signal detector is between 300 and 1500 nm.
3. The on-line measuring device of low-concentration sulfur trioxide gas according to claim 1, characterized in that: the heating window, the heater and the controllable three-way valve are all controlled by the controller.
4. The method for measuring the low-concentration sulfur trioxide gas on line is characterized by comprising the following steps of:
the method comprises the following steps: using a container as a carrier, charging water, heating the container, combining the heated steam with dry or incompletely dry sulfur trioxide gas from a process sample, and combining sulfur trioxide with the steam to form SO3∙H2O state, conversion of sulfur trioxide to acid mist (SO)3∙H2O) purpose;
step two: atomized SO3∙H2The O gas enters the optical measurement cell through the controllable three-way valve and then the concentration of the sulfur trioxide is observed through the observation windowWhile the optical measuring cell performs a sulfur trioxide concentration measurement;
step three: zero point corrected and recorded.
5. The on-line measurement method of low-concentration sulfur trioxide gas according to claim 4, characterized in that: and setting the flow of the sampling gas of the sulfur trioxide in the first step, and then measuring and controlling the flow of the sulfur trioxide through a controller so that the flow of the sampling gas of the sulfur trioxide is on a set value.
6. The on-line measurement method of low-concentration sulfur trioxide gas according to claim 4, characterized in that: the evaporation amount of the water vapor in the first step is realized by controlling the temperature of the water in the container, the amount of the water vapor is increased when the temperature is increased, the amount of the water vapor is reduced when the temperature is reduced, and the temperature of the water in the container is realized by controlling the heater through the controller.
7. The on-line measuring method of low-concentration sulfur trioxide gas according to claim 5, characterized in that: the error range of the flow control precision of the sulfur trioxide is not more than 1 percent, and the error range of the temperature control of the heater is not more than 0.5 degree.
8. The on-line measurement method of low-concentration sulfur trioxide gas according to claim 4, characterized in that: in the second step, the optical measuring cell specifically performs measurement through the following steps:
s1, the ultraviolet light emitter emits ultraviolet light beams, and when the ultraviolet light beams pass through the optical measuring cell containing atomized sulfur trioxide, the light intensity of the ultraviolet light beams is reduced;
s2: the ultraviolet light beam with the reduced light intensity is received by an ultraviolet receiver and is measured and converted into an electric signal;
s3: the electric signal is calculated by Lambert-beer law to obtain the concentration of sulfur trioxide.
9. The on-line measurement method of low-concentration sulfur trioxide gas according to claim 4, characterized in that: the zero point is a numerical value calculated by an electric signal received by the ultraviolet receiver when sulfur trioxide acid mist does not exist in the optical measuring cell, and the specific method for zero point correction in the third step is as follows:
a. injecting clean air into the optical measuring cell by the controllable three-way valve and closing a connecting port of the sulfur trioxide acid mist and the optical measuring cell;
b. the ultraviolet emitter continues to emit light beams, then the ultraviolet receiver receives the light beams, the light intensity does not decrease at the moment, and a new electric signal is obtained;
d. a new value is calculated from the new electrical signal and recorded.
10. The on-line measurement method of low-concentration sulfur trioxide gas according to claim 4, characterized in that: the number of times of zero point correction in the third step may be set once per month.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111766341A (en) * | 2020-07-07 | 2020-10-13 | 西安热工研究院有限公司 | Correction method for sulfur trioxide concentration test in industrial waste gas |
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| CN109655423A (en) * | 2019-01-24 | 2019-04-19 | 南京木达环保科技有限公司 | A kind of gas concentration analytical equipment and its measuring device and analysis method |
| CN211978686U (en) * | 2019-10-31 | 2020-11-20 | 中国石油化工股份有限公司 | Low-concentration sulfur trioxide gas on-line measuring device |
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| CN111766341A (en) * | 2020-07-07 | 2020-10-13 | 西安热工研究院有限公司 | Correction method for sulfur trioxide concentration test in industrial waste gas |
| CN111766341B (en) * | 2020-07-07 | 2023-04-25 | 西安热工研究院有限公司 | Correction method for sulfur trioxide concentration test in industrial waste gas |
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