CN116399824A - H (H) 2 Method and system for measuring gas concentration in mixed flue gas of S and NO - Google Patents
H (H) 2 Method and system for measuring gas concentration in mixed flue gas of S and NO Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 description 2
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- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- AAOVKJBEBIDNHE-UHFFFAOYSA-N diazepam Chemical compound N=1CC(=O)N(C)C2=CC=C(Cl)C=C2C=1C1=CC=CC=C1 AAOVKJBEBIDNHE-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses an H 2 A method and a system for measuring gas concentration in mixed flue gas of S and NO relate to the technical field of gas concentration measurement and comprise the following steps: acquisition of H 2 Spectral data of a mixed gas of S and NO; obtaining a lower envelope curve through curve fitting based on each minimum value point in a curve corresponding to the spectrum data of the mixed gas; wherein the lower envelope curve is a smooth curve passing through all minimum points of the curve, and corresponds to H 2 Spectral data of S; dividing the lower envelope by the gas absorption cell length and H 2 S, obtaining H 2 Concentration of S; wherein the length of the gas absorption tank is a preset value, H 2 S has a gas absorption cross section of H of a known concentration obtained in advance 2 And S, calculating the spectrum data of the S. Can be at H 2 In the mixed gas of S and NO, the interference of NO is reduced, and H is measured independently 2 S concentration, improves the accuracy of measurement.
Description
Technical Field
The invention relates to the technical field of gas concentration measurement, in particular to an H 2 A method and a system for measuring gas concentration in mixed flue gas of S and NO.
Background
With the rapid development of the economy in China, a large amount of energy sources are required to be supplied in order to meet the requirements of mass production and living of people. At present, energy supply is still not separated from a thermal power generation mode. However, the mixed flue gas generated after coal combustion contains harmful gas, when the concentration of the harmful gas is increased sharply under the condition of anoxic combustion, the corrosiveness of the mixed flue gas can cause serious high-temperature corrosion on the inner wall of a pipeline, and the environmental pollution is further aggravated, so that the concentration of the harmful gas is required to be measured, the combustion working condition is convenient to adjust in time, and the combustion process is optimized.
For example, SO is produced in the flue gas of a coal-fired boiler due to the presence of elemental sulfur in the coal 2 And H 2 S gas, H under the anoxic combustion working condition 2 S content also increases sharply, H 2 The S gas can cause serious high-temperature corrosion on the inner wall of the pipeline due to the strong corrosiveness of the S gas. For H 2 The on-line measurement of the S gas is beneficial to the reaction combustion working condition and has important significance in guiding the desulfurization process optimization. At present to H 2 The S gas concentration measurement method includes an iodometry method, an electrochemical method and an optical measurement method. The method for measuring the iodine needs to be used for sampling analysis, has complex operation and potential safety hazard, is easily interfered by other gases in the environment, and is widely applied. For example, cui Zhaolun et al, university of North China, utilize ultraviolet differential absorption spectroscopy and convert H 2 S, carrying out Fourier transformation on the differential absorption curve to obtain a relation between the amplitude and the concentration to carry out H 2 S concentration inversion, yunyun applies ultraviolet absorption spectroscopy principle and least square method to H 2 S concentration was measured. However, the above studies are only in laboratory studies and do not take into account the effects of changes in the field environment.
In addition, the components in the flue gas are complex, and regarding the SO 2 And H 2 S has been studied in many ways. However, NO and H are currently relevant 2 S mixed gas measurement research is less, and NO and H in smoke components are less 2 S exists simultaneously, the absorption of NO in ultraviolet band is mainly distributed in three absorption peaks, which are respectively positioned near 204.5 nm,216.4 nm,226 nm and H 2 The absorption lines of the wave bands in the 200-240 nm target range of S are overlapped, and the absorption lines are overlapped and interfered with each other, so that the presence of NO in the measuring process leads to H 2 The measured concentration of S is high, so how to reduce the interference of NO in the mixed gas,measurement of H alone 2 S gas concentration is also a challenge to be solved.
Disclosure of Invention
In order to solve at least one technical problem mentioned in the background art, an object of the present invention is to provide an H 2 Method and system for measuring gas concentration in mixed flue gas of S and NO, and method and system can be used for measuring gas concentration in H 2 In the mixed gas of S and NO, the interference of NO is reduced, and H is measured independently 2 S concentration, improves the accuracy of measurement.
In order to achieve the above purpose, the present invention provides the following technical solutions:
in a first aspect, an embodiment of the present invention provides an H 2 A method for measuring gas concentration in a mixed flue gas of S and NO, comprising:
acquisition of H 2 Spectral data of a mixed gas of S and NO;
obtaining a lower envelope curve through curve fitting based on each minimum value point in a curve corresponding to the spectrum data of the mixed gas; wherein the lower envelope curve is a smooth curve passing through all minimum points of the curve, and corresponds to H 2 Spectral data of S;
dividing the lower envelope by the gas absorption cell length and H 2 S, obtaining H 2 Concentration of S; wherein the length of the gas absorption tank is a preset value, and the H is the same as the length of the gas absorption tank 2 S has a gas absorption cross section of H of a known concentration obtained in advance 2 And S, calculating the spectrum data of the S.
Further, the one H 2 The method for measuring the gas concentration in the mixed flue gas of S and NO further comprises the following steps:
subtracting the lower envelope curve from the curve corresponding to the spectrum data of the mixed gas to obtain a curve corresponding to the spectrum data of NO;
dividing a curve corresponding to the spectrum data of the NO by the product of the length of the gas absorption tank and the gas absorption section of the NO to obtain the concentration of the NO; the gas absorption section of the NO is calculated after spectral data of the NO with known concentration is acquired in advance.
Further, what is said isThe acquisition H 2 The step of spectrum data of the mixed gas of S and NO comprises the following steps:
acquisition of H 2 Transmission spectrum data of a mixed gas of S and NO and emission spectrum data of a light source;
subtracting the emission spectrum data from the transmission spectrum data to obtain H 2 Spectral data of a mixed gas of S and NO.
Further, the acquisition H 2 A step of transmitting spectrum data of a mixed gas of S and NO and emission spectrum data of a light source, comprising:
obtaining dark spectrum data;
acquisition of H 2 First transmission spectrum data of a mixed gas of S and NO and first emission spectrum data of a light source;
subtracting the dark spectrum data from the first transmission spectrum data and the first emission spectrum data to obtain H 2 Transmission spectrum data of a mixed gas of S and NO and emission spectrum data of a light source.
Further, the step of obtaining the lower envelope curve by curve fitting based on each minimum point in the curve corresponding to the spectrum data of the mixed gas includes:
performing curve fitting on all minimum value points in the curve corresponding to the spectrum data of the mixed gas by a cubic spline interpolation method to obtain a spline fitting curve, wherein the spline fitting curve is used as a lower envelope curve, or
And taking a curve obtained by smoothing the spline fitting curve through an adjacent averaging method as a lower envelope curve.
Further, the step of obtaining the gas absorption section includes:
obtaining H of known concentration 2 Spectral data of S or NO;
will H 2 The spectral data of S or NO divided by the product of the gas absorption cell length and the corresponding gas concentration gives H 2 S or NO.
In a second aspect, embodiments of the present invention provide an H 2 A system for measuring gas concentration in a mixed flue gas of S and NO comprising:
the device comprises a light source, a reference channel, a measurement channel, a detector and an upper computer;
the light source is used for emitting light rays to the reference channel and the measuring channel;
the reference channel is used for transmitting the received light to the detector;
the measuring channel is used for receiving the gas to be measured and the light rays emitted by the light source and transmitting the light rays carrying the information of the gas to be measured to the detector; the light carrying the information of the gas to be detected is obtained by the gas to be detected acting on the light emitted by the light source;
the detector is used for receiving the light transmitted by the reference channel and the light transmitted by the measurement channel and carrying the information of the gas to be detected, and uploading the light to the upper computer;
the upper computer is used for executing any one of the H 2 A method for measuring gas concentration in mixed flue gas of S and NO.
In a third aspect, embodiments of the present invention also provide a computer storage medium having stored thereon a computer program which, when executed by a processor, implements an H as described above 2 A method for measuring gas concentration in mixed flue gas of S and NO.
In a fourth aspect, an embodiment of the present invention further provides a terminal device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing H as described above when executing the computer program 2 A method for measuring gas concentration in mixed flue gas of S and NO.
Compared with the prior art, the invention has the beneficial effects that: the invention is realized by solving H 2 Lower envelope of curve corresponding to spectrum data of mixed gas of S and NO, and calculating H based on lower envelope 2 S concentration, reduced in detection of H 2 H in mixed flue gas of S and NO 2 NO vs H at S concentration 2 S interference improves the accuracy of measurement.
Drawings
FIG. 1 shows H provided by an embodiment of the present invention 2 Mixing of S and NOA first flow chart of a method for measuring gas concentration in flue gas;
FIG. 2 is a schematic diagram of an initial light intensity signal and a light intensity offset signal according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an initial absorption curve and a single-channel processed absorption curve after light intensity shift according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a dual-channel absorption curve after light intensity shifting according to an embodiment of the present invention;
FIG. 5 is a graph of 300ppmNO and 300ppmH provided by an embodiment of the present invention 2 A schematic representation of the absorption curve of S;
FIG. 6 is a schematic diagram of an absorption curve and a lower envelope of a mixed gas according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a lower envelope curve corresponding to different window numbers according to an embodiment of the present invention;
FIG. 8 shows H provided by an embodiment of the present invention 2 A second flow chart of a method for measuring gas concentration in the mixed flue gas of S and NO;
FIG. 9 is a schematic diagram of an NO absorption curve obtained by using the lower envelope curve according to the embodiment of the present invention;
fig. 10 is a diagram of an embodiment of the present invention 2 An architecture diagram of a system for measuring gas concentration in mixed flue gas of S and NO.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to solve the problems in the prior art, an embodiment of the invention discloses an H 2 The method and system for measuring the gas concentration in the mixed flue gas of S and NO are respectively described in detail below.
Embodiment one:
as shown in FIG. 1, FIG. 1 is the presentH provided by the embodiment of the invention 2 A first flow chart of a method for measuring gas concentration in mixed flue gas of S and NO. The method can be applied to electronic equipment such as mobile phones, upper computers and the like. For convenience of description, the following description will be made with the electronic device as an execution subject. The method comprises the following steps:
step S101, obtaining H 2 Spectral data of a mixed gas of S and NO.
In one embodiment, the electronic device obtains H as described above 2 The step of spectrum data of the mixed gas of S and NO (step S101) can be refined as follows.
Step S1011, obtaining H 2 Transmission spectrum data of a mixed gas of S and NO and emission spectrum data of a light source;
the light source may be an ultraviolet xenon lamp, or may be a light emitter such as a laser, which is not limited in this embodiment of the present invention, and for convenience of description, an ultraviolet xenon lamp is taken as an example.
The ultraviolet xenon lamp emits light, the light is divided into two paths by the optical fiber beam splitter, the two paths of light are respectively injected into different two channels, one path of light does not undergo any treatment, and the spectral data of the light is directly obtained by electronic equipment, namely the emission spectral data of the light source; another path of light and H 2 The mixed gas of S and NO is in the same channel, H 2 The concentration of the mixed gas of S and NO can influence the intensity signal intensity of the light, H 2 The greater the concentration of the mixed gas of S and NO, the stronger the light intensity signal of the light, and conversely, the weaker the light intensity signal of the light, so that the light carries H 2 Concentration information of mixed gas of S and NO, namely H 2 Transmission spectrum data of the mixed gas of S and NO.
Step S1012, subtracting the emission spectrum data from the transmission spectrum data to obtain H 2 Spectral data of a mixed gas of S and NO.
Because the light intensity signal emitted by the light source inevitably has some variation, and in long-time measurement, the acquired light intensity signal is offset due to environmental variation and instrument heating. FIG. 2 is a diagram of an initial light intensity signal and a light intensity offset signal according to an embodiment of the present inventionIt can be seen that the light intensity after the light intensity deviation has a certain difference from the initial light intensity, and the light intensity after the light intensity deviation has a certain difference from the initial light intensity. However, in the embodiment of the present invention, two light rays are emitted by the same light source at the same time, so that the two light rays are affected by the same environmental factor, i.e. the offset amounts of the two light rays are the same, through H 2 The spectrum data of the light source is subtracted from the transmission spectrum data of the mixed gas of S and NO, and the offset can be exactly offset to obtain H 2 The spectrum data of the mixed gas of S and NO reduces errors caused by external factors such as environmental changes and instrument heating, and improves the accuracy of measurement.
Fig. 3 is a schematic diagram of an initial absorption curve and a single-channel processed absorption curve after light intensity shift according to an embodiment of the present invention. The initial absorption curve is the spectrum data of the mixed gas obtained when the light intensity is not deviated, and obviously, the difference between the two curves in the figure is larger, which indicates that the light intensity deviation is not eliminated by using single-channel measurement, so that the measurement error is larger. Fig. 4 is a schematic diagram of a dual-channel absorption curve after light intensity shift according to an embodiment of the present invention. The two-channel processing absorption curve is basically identical to the initial absorption curve in fig. 4, that is, the measurement error caused by the light intensity offset can be basically eliminated by adopting the methods of step S1011 to step S1012, so that the measurement accuracy is improved.
In one embodiment, the electronic device obtains H as described above 2 The step of transmitting the spectrum data of the mixed gas of S and NO and the emission spectrum data of the light source (step S1011) can be refined as follows.
In step S10111, dark spectrum data is acquired.
Dark spectrum data, which are received by the electronic device when the light source is not turned on, are recorded first, and belong to signals caused by instruments and environmental noise, which can cause errors in measurement.
Step S10112, obtain H 2 The first transmission spectrum data of the mixed gas of S and NO and the first emission spectrum data of the light source.
Light sourceThe emitted light is split into two paths by the optical fiber beam splitter, wherein the light is not influenced by H 2 A path of light ray influenced by the mixed gas of S and NO is acquired by electronic equipment, is used as first emission spectrum data of a light source, and is influenced by H 2 A path of light affected by the mixed gas of S and NO is acquired by the electronic equipment and used as H 2 First transmission spectrum data of a mixed gas of S and NO.
Step S10113, subtracting the dark spectrum data from the first transmission spectrum data and the first emission spectrum data to obtain H 2 Transmission spectrum data of a mixed gas of S and NO and emission spectrum data of a light source.
The electronic device subtracts (step S10111) the acquired dark spectrum data from the first transmission spectrum data and the first emission spectrum data acquired (step S10112) to obtain H 2 Transmission spectrum data of a mixed gas of S and NO and emission spectrum data of a light source. At this time, H 2 The transmission spectrum data of the mixed gas of S and NO and the emission spectrum data of the light source remove certain noise signals, so that the measurement accuracy is further improved.
Step S102, obtaining a lower envelope curve through curve fitting based on each minimum value point in a curve corresponding to the spectrum data of the mixed gas; wherein the lower envelope curve is a smooth curve passing through all minimum points of the curve, and corresponds to H 2 S spectral data.
As shown in FIG. 5, FIG. 5 is a graph of 300ppmNO and 300ppmH provided by an embodiment of the present invention 2 A schematic representation of the absorption curve of S, NO has absorption characteristics only in the three absorption peak bands, and NO absorption characteristics in other ranges. Fig. 6 is a schematic diagram of an absorption curve and a lower envelope of a mixed gas according to an embodiment of the present invention, as shown in fig. 6. The spectrum data of the mixed gas corresponds to the absorption curve of the mixed gas in the graph, the curve has three minimum value points, the lower envelope curve is a smooth curve passing through the three minimum value points, and the curve corresponds to H 2 S spectral data. Because of NO and H 2 S is interfered with each other at a wavelength of 200-240 nm, and NO has absorption characteristics only in three absorption peak wave bands, but has NO absorption characteristics in other ranges, so thatThe lower envelope removes NO interference.
In one embodiment, all minimum value points in a curve corresponding to the spectrum data of the mixed gas are subjected to curve fitting through a cubic spline interpolation method or some common fitting methods such as piecewise linear function fitting to obtain a spline fitting curve, and the spline fitting curve is used as a lower envelope curve.
In another embodiment, all the minimum value points in the curve corresponding to the spectrum data of the mixed gas are subjected to curve fitting through a cubic spline interpolation method or a piecewise linear function fitting method and other common fitting methods to obtain a spline fitting curve, and the curve obtained by smoothing the spline fitting curve through an adjacent averaging method is used as a lower envelope curve. After being smoothed by the adjacent averaging method, the obtained lower envelope curve is closer to H 2 S spectral data.
After the spectrum data of the mixed gas is obtained, all extreme points, of which the first derivative is equal to zero, in the absorption curve corresponding to the spectrum data of the mixed gas are determined, wherein the maximum points correspond to the upper envelope curve of the curve, the minimum points correspond to the lower envelope curve of the curve, cubic spline interpolation is carried out through the minimum points, spline fitting curves are obtained through fitting of each minimum point through a cubic polynomial function, then the spline fitting curves are smoothed through an adjacent averaging method, namely, the average value of a certain number of data points is taken around each point in the spline fitting curve data, the number of the data points is determined by the number of windows, as shown in fig. 7, fig. 7 is a schematic diagram of the lower envelope curve corresponding to different window numbers provided by the embodiment of the invention, and when the number of windows is 3, the lower envelope curve processing effect is best.
Step S103, dividing the lower envelope by the gas absorption cell length and H 2 S, obtaining H 2 Concentration of S; wherein the length of the gas absorption tank is a preset value, H 2 S has a gas absorption cross section of H of a known concentration obtained in advance 2 And S, calculating the spectrum data of the S.
The calculation formula is as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,A(λ) For the absorption curve (i.e. the lower envelope),I 0 in order to emit a light intensity of the light,Iin order to transmit the intensity of light,I b in order to make the light in the dark strong,σ(λ) For the gas-absorbing cross-section,Cin order to achieve a gas concentration,Lis the length of the gas absorption tank.
As can be derived from the formula,
dividing the lower envelope by the gas absorption cell length and H 2 S, obtaining H 2 Concentration of S.
In one embodiment, the above H 2 The gas absorption cross section of S is obtained by:
step S1031, obtaining H with known concentration 2 Spectral data of S;
first, H with known concentration is obtained 2 S, for subsequent calculation of H 2 S gas absorption cross section.
Step S1032, H 2 S spectral data divided by gas absorption cell length and H 2 S is multiplied by the gas concentration to obtain H 2 S gas absorption cross section.
As can be derived from the above formula,
because of H 2 S is known in gas concentration, so H 2 S spectral data divided by gas absorption cell length and H 2 S is multiplied by the gas concentration to obtain H 2 S gas absorption cross section.
Gas absorption cross sectionσ(λ) The gas absorption section is only related to temperature and pressure, and the gas absorption section does not change along with the concentration change at a certain temperature and pressure, so that the gas absorption section is obtained by measuring the absorption curve with known concentration once and then calculating, and the value of the gas absorption section is stored and can be used for the subsequent concentration measurement.
Embodiment two:
in this embodiment, as shown in fig. 8, fig. 8 is a view of H provided in the embodiment of the present invention 2 A second flow chart of a method for measuring gas concentration in mixed flue gas of S and NO. In order to further obtain the gas concentration of NO, the first embodiment further includes:
step S104, subtracting the lower envelope curve from the curve corresponding to the spectrum data of the mixed gas to obtain the curve corresponding to the spectrum data of NO.
The spectrum data of the mixed gas corresponds to a curve represented by H 2 Spectral data of a mixture of two gases, S and NO, with the lower envelope corresponding to H 2 S, so that the curve corresponding to the spectrum data of the mixed gas is subtracted from the lower envelope curve to obtain the curve corresponding to the spectrum data of NO, as shown in FIG. 9, FIG. 9 is a schematic diagram of the NO absorption curve obtained by using the lower envelope curve according to the embodiment of the present invention, and the curve substantially coincides with the NO absorption curve in FIG. 5. Therefore, not only H can be obtained by adopting the lower envelope curve mode 2 The concentration of S can also give the concentration of NO.
Step S105, dividing a curve corresponding to the spectrum data of NO by the product of the length of the gas absorption tank and the gas absorption section of NO to obtain the concentration of NO; the gas absorption section of NO is calculated after spectral data of NO with known concentration is acquired in advance.
Similar to steps S1031 to S1032, spectral data of NO of known concentration is first acquired using the formula
Calculating the gas absorption section of NO, and substituting the formula +.>
The concentration of NO can be calculated, and will not be described here.
Embodiment III:
and H is 2 Corresponding to the embodiment of the method for measuring the gas concentration in the mixed flue gas of S and NO, the embodiment of the invention also provides an H 2 And a system for measuring gas concentration in the mixed flue gas of S and NO. As shown in fig. 10, fig. 10 is a diagram of an embodiment of the present invention for providing an H 2 Mixing of S and NOAn architectural diagram of a system for measuring gas concentration in flue gas, comprising: a light source 1001, a reference channel 1002, a measurement channel 1003, a detector 1004 and an upper computer 1005.
A light source 1001 for emitting light to a reference channel 1002 and a measurement channel 1003.
A measurement channel 1003 for receiving the gas to be measured and the light emitted by the light source 1001, and transmitting the light carrying the information of the gas to be measured to the detector 1004; the light carrying the information of the gas to be measured is obtained by applying the gas to be measured to the light emitted by the light source 1001.
And the detector 1004 is used for receiving the light transmitted by the reference channel 1002 and the light carrying the gas information to be measured transmitted by the measurement channel 1003, and uploading the light to the upper computer 1005.
An upper computer 1005 for performing an H as described in the first or second embodiment after receiving the data uploaded by the probe 2 A method for measuring gas concentration in mixed flue gas of S and NO.
For example, the light source 1001 adopts an ultraviolet xenon lamp with a wavelength range of 185-400 nm, after being split by an optical fiber splitter, two paths of light rays are respectively emitted to the reference channel 1002 and the measurement channel 1003, only the light rays emitted by the light source in the reference channel 1002, the measurement channel 1003 is filled with a gas to be tested, the gas to be tested acts on the light rays to obtain the light rays carrying the information of the gas to be tested, the detector 1004 adopts a CCD area array sensor with a wavelength range of 200-340 nm, the detector 1004 receives the light rays output by the reference channel 1002 and the measurement channel 1003, and spectral data are uploaded to the upper computer 1005, and the upper computer 1005 executes any one of the H 2 A method for measuring gas concentration in mixed flue gas of S and NO.
Embodiment four:
and H is 2 Corresponding to the embodiment of the method for measuring the gas concentration in the mixed flue gas of S and NO, the embodiment of the invention also provides a computer storage medium, on which a computer program is stored, which when being executed by a processor, realizes one H as in the first or second embodiment 2 S and NOA method for measuring gas concentration in mixed flue gas.
Fifth embodiment:
and H is 2 The embodiment of the invention also provides a terminal device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes one H as in the first embodiment or the second embodiment when executing the computer program 2 A method for measuring gas concentration in mixed flue gas of S and NO.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (9)
1. H (H) 2 A method for measuring gas concentration in a mixed flue gas of S and NO, comprising:
acquisition of H 2 Spectral data of a mixed gas of S and NO;
obtaining a lower envelope curve through curve fitting based on each minimum value point in a curve corresponding to the spectrum data of the mixed gas; wherein the lower envelope curve is a smooth curve passing through all minimum points of the curve, and corresponds to H 2 Spectral data of S;
dividing the lower envelope by the gas absorption cell length and H 2 S, obtaining H 2 Concentration of S; wherein the length of the gas absorption tank is a preset value, and the H is the same as the length of the gas absorption tank 2 S has a gas absorption cross section of H of a known concentration obtained in advance 2 And S, calculating the spectrum data of the S.
2. An H according to claim 1 2 The method for measuring the gas concentration in the mixed flue gas of S and NO is characterized by further comprising the following steps:
subtracting the lower envelope curve from the curve corresponding to the spectrum data of the mixed gas to obtain a curve corresponding to the spectrum data of NO;
dividing a curve corresponding to the spectrum data of the NO by the product of the length of the gas absorption tank and the gas absorption section of the NO to obtain the concentration of the NO; the gas absorption section of the NO is calculated after spectral data of the NO with known concentration is acquired in advance.
3. An H according to claim 1 2 A method for measuring gas concentration in mixed flue gas of S and NO is characterized in that H is obtained 2 The step of spectrum data of the mixed gas of S and NO comprises the following steps:
acquisition of H 2 Transmission spectrum data of a mixed gas of S and NO and emission spectrum data of a light source;
subtracting the emission spectrum data from the transmission spectrum data to obtain H 2 Spectral data of a mixed gas of S and NO.
4. An H according to claim 3 2 A method for measuring gas concentration in mixed flue gas of S and NO is characterized in that H is obtained 2 A step of transmitting spectrum data of a mixed gas of S and NO and emission spectrum data of a light source, comprising:
obtaining dark spectrum data;
acquisition of H 2 First transmission spectrum data of a mixed gas of S and NO and first emission spectrum data of a light source;
subtracting the dark spectrum data from the first transmission spectrum data and the first emission spectrum data to obtain H 2 Transmission spectrum data of a mixed gas of S and NO and emission spectrum data of a light source.
5. An H according to claim 1 2 In mixed flue gas of S and NOThe method for measuring the gas concentration is characterized in that the step of obtaining the lower envelope curve through curve fitting based on each minimum point in the curve corresponding to the spectrum data of the mixed gas comprises the following steps:
performing curve fitting on all minimum value points in the curve corresponding to the spectrum data of the mixed gas by a cubic spline interpolation method to obtain a spline fitting curve, wherein the spline fitting curve is used as a lower envelope curve, or
And taking a curve obtained by smoothing the spline fitting curve through an adjacent averaging method as a lower envelope curve.
6. An H according to claim 1 or 2 2 The method for measuring the gas concentration in the mixed flue gas of S and NO is characterized in that the step of acquiring the gas absorption section comprises the following steps:
obtaining H of known concentration 2 Spectral data of S or NO;
will H 2 The spectral data of S or NO divided by the product of the gas absorption cell length and the corresponding gas concentration gives H 2 S or NO.
7. H (H) 2 A system for measuring gas concentration in a mixed flue gas of S and NO, comprising: the device comprises a light source, a reference channel, a measurement channel, a detector and an upper computer;
the light source is used for emitting light rays to the reference channel and the measuring channel;
the reference channel is used for transmitting the received light to the detector;
the measuring channel is used for receiving the gas to be measured and the light rays emitted by the light source and transmitting the light rays carrying the information of the gas to be measured to the detector; the light carrying the information of the gas to be detected is obtained by the gas to be detected acting on the light emitted by the light source;
the detector is used for receiving the light transmitted by the reference channel and the light transmitted by the measurement channel and carrying the information of the gas to be detected, and uploading the light to the upper computer;
the upper computer is used for executing the method of any one of claims 1 to 6.
8. A computer storage medium having stored thereon a computer program which, when executed by a processor, implements a method as claimed in any one of claims 1 to 7.
9. A terminal device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method according to any one of claims 1 to 7 when executing the computer program.
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