JP4671607B2 - Gas component measuring device and exhaust gas discharge facility - Google Patents

Description

  The present invention relates to a gas component measuring device and an exhaust gas discharge facility for measuring the concentration of a gas component contained in, for example, exhaust gas.

In recent years, regulations on exhaust gas have become stronger. For example, even in incineration facilities, there are local governments that have a regulation of 10 ppm for gas components in the exhaust gas, such as sulfur dioxide (SO ₂ ). In order to cope with the regulations, naturally, it is necessary to improve the measurement accuracy of a gas component measuring device (also a gas analyzer) that measures a gas component in the exhaust gas.

For example, as an automatic measuring instrument for measuring the concentration of sulfur dioxide, there is one disclosed in Non-Patent Document 1 [JIS B 7981 (2002)].
The measurement range related to the automatic measuring instrument disclosed in Non-Patent Document 1 is 0 to 10 ppm in the case of the ultraviolet fluorescence method, 0 to 25 ppm in the case of the infrared absorption method and the ultraviolet absorption method, and 0 to 0 in the case of the interference spectroscopy method. The allowable error (error range) is ± 2% of the maximum scale value. For example, in the case of 0 to 25 ppm, the tolerance is ± 0.5 ppm, and in the case of 0 to 10 ppm, the tolerance is ± 0.2 ppm.

In addition, these measuring instruments are provided with various usage conditions. In consideration of these conditions, an infrared absorption type is usually used. According to this infrared absorption measuring instrument, the tolerance is ± 0.5 ppm. Therefore, when the regulation value is 10 ppm, the tolerance is ± 5%.
JIS B 7981 (2002)

  By the way, it is expected that the regulation value will become more severe as environmental problems are closed up.For example, in a waste incineration plant, the combustion state is complicated and difficult to control, and although improvement of the combustion control method is progressing steadily, The enhancement of the value is followed by a device in the post-combustion process.

  Under these circumstances, gas chromatography is certainly accurate, but it measures only once every few minutes, so if you need to know more about changes in gas components, that is, continuous measurement needs. It can not cope with.

  Further, in the analyzer other than gas chromatography, that is, in the ultraviolet fluorescent automatic measuring instrument as described above, when the regulation value is further strengthened, for example, when the emission regulation value of sulfur dioxide is 5 ppm or less or 1 ppm or less. The tolerance becomes so large as 10% or 50%, and it cannot be used.

On the other hand, as a measuring instrument for measuring with high accuracy, there is an instrument for the atmosphere whose gas concentration is much lower than that of exhaust gas.
JIS B 7952 (1996) is known as a measuring instrument for sulfur dioxide in the atmosphere, and an ultraviolet fluorescent method is shown as a method capable of continuous measurement. These methods can be measured in the range of 0 to 0.10 ppm or 0 to 1.00 ppm, and the indication error is ± 4%, so it seems that it can cope with the strengthening of emission regulation values. However, it could not be applied to the analysis of gas components of exhaust gas under poor conditions where the concentrations of various gas components are much higher than those of the atmosphere.

  For example, when trying to apply an ultraviolet fluorescent measuring instrument for the atmosphere to exhaust gas, it was found that nitrogen monoxide (NO) interfered with it and became noise, and in addition, nitrogen monoxide in the exhaust gas was measured. The concentration is about 5 to 50 times higher than that of sulfur dioxide, and is constantly changing within the regulated range. However, it has been found to be fatal in high-precision measurement.

  Then, this invention aims at providing the gas component measuring device which can measure the density | concentration of the gas component in waste gas using the high precision measuring instrument for air | atmosphere, and the waste gas discharge equipment provided with the said measuring device. .

In order to solve the above-mentioned problem, a gas component measuring apparatus according to claim 1 of the present invention uses an ultraviolet fluorescent method to determine the concentration of a predetermined gas component that is guided by a gas introduction pipe and contained in a gas to be measured. A gas component measuring device that uses and measures,
A first gas concentration measuring device for measuring the concentration of a gas component to be measured;
A second gas concentration measuring device that measures the concentration of the other gas component such that a measurement error caused by measuring another gas component is included in the concentration value measured by the first gas concentration measuring device. When,
The concentration value of the other gas component measured by the second gas concentration measuring device is inputted, and the measurement error caused by the other gas component measured by the first gas concentration measuring device is changed to the concentration value. A measurement error detection unit that detects using a proportional coefficient according to
The measurement error detected by the measurement error detector and the concentration value of the predetermined gas component measured by the first gas concentration measuring device are input, and the measurement error is subtracted from the concentration value of the predetermined gas component. A concentration calculation unit for obtaining a concentration value of a predetermined gas component;
Comprising calibration means for performing zero calibration in each gas concentration measuring instrument and calibration of the proportionality coefficient used in the measurement error detector,
And the calibration means,
A gas supply pipe having one end connected to the exhaust gas introduction pipe;
A gas cylinder that is connected to the other end of the gas supply pipe via a first connection pipe and filled with a predetermined gas component, and a gas cylinder filled with another gas component;
The predetermined gas component, other gas components, and inert gas or air are guided through the second connection pipe connected to each of the first connection pipes to dilute to a predetermined concentration gas, and the dilution gas is opened and closed. And a gas diluter that supplies the gas supply pipe via a third connection pipe provided with a valve .

  Moreover, the gas component measuring device according to claim 2 is configured such that the first gas concentration measuring device and the second gas concentration measuring device in the measuring device according to claim 1 are connected in series, and either one of these gas concentrations is measured. The gas taken out from the measuring instrument is guided to the other gas measuring instrument.

A gas component measuring apparatus according to claim 3 is the measuring apparatus according to claim 1 or 2, wherein the gas to be measured is exhaust gas.
According to a fourth aspect of the present invention, there is provided the gas component measuring apparatus according to any one of the first to third aspects, wherein the measurement method in the gas concentration measuring instrument is an ultraviolet fluorescent method, and the gas component to be measured is a carbon dioxide. Another gas component that is sulfur and causes measurement errors is nitric oxide.

Further, the exhaust gas discharge facility according to claim 5 includes an exhaust gas flow channel, an exhaust gas sampling tube for collecting a part of the exhaust gas from the exhaust gas flow channel, and a predetermined gas component of the exhaust gas collected by the exhaust gas sampling tube. Consists of a gas component measuring device that measures the concentration,
This gas component measuring device measures at least the first gas concentration measuring device that measures the concentration of the gas component to be measured and the concentration value measured by the first gas concentration measuring device to measure other gas components. A second gas concentration measuring device that measures the concentration of the other gas component that includes a measurement error caused by the error, and a concentration value of the other gas component measured by the second gas concentration measuring device. A measurement error detecting unit for detecting a measurement error of the other gas component measured by the first gas concentration measuring instrument, and a measurement error detected by the measurement error detecting unit and the first gas concentration measuring instrument. A concentration calculating means for inputting a concentration value of a predetermined gas component measured in this way and subtracting a measurement error from the concentration value of the predetermined gas component to obtain a concentration value of the predetermined gas component. .

Furthermore, the exhaust gas discharge facility according to claim 5 includes an exhaust gas flow path, an exhaust gas sampling pipe for collecting a part of the exhaust gas from the exhaust gas flow path, and guiding the exhaust gas collected by the exhaust gas sampling pipe for a predetermined gas component. Consists of a gas component measuring device that measures the concentration using an ultraviolet fluorescent method ,
And this gas component measuring device,
At least a first gas concentration measuring device that measures the concentration of a gas component to be measured, and a measurement error that occurs due to measuring other gas components in the concentration value measured by the first gas concentration measuring device A second gas concentration measuring device that measures the concentration of the other gas component, and the concentration value of the other gas component measured by the second gas concentration measuring device is input to input the first gas. A measurement error detector that detects a measurement error caused by the other gas component measured by the concentration measuring instrument, a measurement error detected by the measurement error detector, and the first gas concentration measuring instrument. The concentration calculation unit for inputting the concentration value of the predetermined gas component and subtracting the measurement error from the concentration value of the predetermined gas component to obtain the concentration value of the predetermined gas component, and the zero in each gas concentration measuring device Calibration and above Consist of a calibration means for calibrating the proportional coefficient used in measuring the error detection unit,
And the calibration means,
A gas supply pipe having one end connected to the exhaust gas introduction pipe;
A gas cylinder that is connected to the other end of the gas supply pipe via a first connection pipe and filled with a predetermined gas component, and a gas cylinder filled with another gas component;
The predetermined gas component, other gas components, and inert gas or air are guided through the second connection pipe connected to each first connection pipe to dilute to a predetermined concentration gas, and the diluted gas is The gas diluter is configured to be supplied to the gas supply pipe through a three connection pipe .

More specifically, when the concentration measuring device for measuring the concentration of the SO ₂ gas component in the exhaust gas is an ultraviolet fluorescent type, it is greatly affected by the presence of the NO gas component which is another gas component. It detects a measurement error due to NO gas component. Thus subtracting the measurement error due to NO gas from the measured value of sO _2, with a gas concentration meter for the air, sO ₂ gas concentration a predetermined error range Within, that is, with high accuracy.

  Also, by connecting two gas concentration measuring instruments in series, the flow rate will not change individually compared to the case of connecting them in parallel, eliminating the variation in responsiveness between the two measuring instruments. Can do.

  According to the configuration described in claim 5, in a facility that discharges gas inferior to the atmosphere of a garbage incinerator and other various plants, it is possible to analyze exhaust gas components with high accuracy, and control the results. It can be used to improve exhaust gas treatment.

[Embodiment]
Hereinafter, a gas component measuring apparatus and an exhaust gas discharge facility according to an embodiment of the present invention will be described with reference to FIGS.

  In the present embodiment, a low-concentration sulfur dioxide concentration of less than 5 ppm or less than 1 ppm in exhaust gas discharged from a waste incinerator is used for measuring atmospheric gas concentration with high measurement accuracy using an ultraviolet fluorescent method [ For example, it is assumed that measurement is performed using a gas analyzer defined in JIS B 7952 (1996). Further, in the atmospheric gas concentration measuring instrument using the ultraviolet fluorescence method, measurement error occurs due to nitric oxide when measuring the concentration of sulfur dioxide. Generally speaking, the gas to be measured is irradiated with light of a predetermined wavelength to excite a predetermined gas component, and the light emitted from the excited gas component is observed to detect the concentration of the predetermined gas component However, when other gas components other than the gas component to be measured are excited by light of a predetermined wavelength, the other gas components are also measured, and thus an error is included.

As shown in FIG. 1, this gas component measuring apparatus 1 has a flue 2 for guiding combustion exhaust gas (hereinafter simply referred to as exhaust gas) generated in a furnace body of a waste incinerator to a chimney or the like that is released to the atmosphere. That is, the concentration of sulfur dioxide (hereinafter referred to as SO ₂ ) in the exhaust gas flowing through the exhaust gas exhaust facility 4 having the flue 2 in which the bag filter 3 and the like are arranged is measured. Therefore, the exhaust gas discharge facility 4 includes at least a gas component measuring device 1 and a flue 2 provided with dust removing means such as a bag filter 3 that can remove dust in the exhaust gas.

This gas component measuring device 1 is installed in the monitoring room as an analytical instrument panel, and is connected to the middle of the flue 2 downstream from the bag filter 3 to collect a part of the exhaust gas flowing in the flue 2. The exhaust gas collected by the exhaust gas 10 is guided through an exhaust gas supply pipe (for example, provided with a length of several tens of meters) 11 and an exhaust gas introduction pipe 12, and nitrogen monoxide (hereinafter referred to as NO) in the exhaust gas An NO concentration measuring device (an example of a first gas concentration measuring device) 13 that measures (detects) the concentration, and exhaust gas that has passed through the NO concentration measuring device 13 is guided through the exhaust gas connection pipe 14 to measure the concentration of SO ₂ ( (Detection) SO ₂ concentration measuring device (an example of a second gas concentration measuring device) 15 and each concentration measured by the NO concentration measuring device 13 and the SO ₂ concentration measuring device 15 are input, and SO in the exhaust gas is input. ₂ Upon measurement, in order to remove the measure due to the influence of NO error (also referred to as noise), and SO ₂ concentration calculating means 16 for obtaining the free SO ₂ concentrations error by subtracting Searching for the measurement error, the respective concentration measuring instrument 13 and 15 and calibration means 17 for calibrating a coefficient k (described later) used in the SO ₂ concentration calculation means 16.

A first moisture removing device (comprising an electronic cooler 21a, a drain pot 21b, and a drain pump 21c) 21 for forcibly removing water vapor in the middle of the exhaust gas supply pipe 11 and close to the exhaust gas collecting means 10. The exhaust gas supply pipe 11 is heated as a whole to suppress the generation of moisture. The first moisture removing device 21 is installed in order to suppress as much as possible the generation of measurement errors due to dissolution of SO ₂ in moisture, since the exhaust gas contains a relatively large amount of moisture. Although it is not usually installed, it is very effective for low concentration measurement. The first moisture removing device 21 is installed beside the exhaust gas collecting means 10 and removes moisture at a relatively early stage.

  Further, an analysis panel side exhaust gas introduction pipe (a fluorine resin pipe is used) 12 connected to the end of the exhaust gas supply pipe 11 includes a filter 22 for removing dust in the exhaust gas, and a sampling gas amount to a specified value. A needle valve 23 to be adjusted, a gas suction pump 24 for sucking a sampling gas, and a second moisture removing device (electronic cooler 25a, drain) for lowering the moisture in the sampling gas to a specified level required by the measuring instruments 13 and 15 (Consisting of a pot 25b and a drain pump 25c) 25, a needle valve 26 for adjusting the amount of sampling gas to a specified level required by the measuring devices 13 and 15, and a flow meter 27 indicating the amount of sampling gas flowing through each of the measuring devices 13 and 15. And are provided.

Next, the SO ₂ concentration calculating means 16 will be described.
The SO ₂ concentration calculating means 16, as described above, when the measurement of the SO ₂ in SO ₂ concentration measuring device 15 subtracts the measurement error generated due to the presence of NO from SO ₂ concentration value of the measured Thus, an accurate SO ₂ concentration value is obtained. Generally, the NO concentration value from the NO concentration measuring device 13 is input, and a measurement error is detected using a coefficient k, for example, according to the concentration value. The measurement error detector 16a, the measurement error from the measurement error detector 16a and the actual SO ₂ concentration value from the SO ₂ concentration measuring device 15 are input, and the measurement error is subtracted from the actual SO ₂ concentration value. The concentration calculation unit 16b obtains an accurate (true) SO ₂ concentration value.

By the way, the measurement error for the SO ₂ concentration due to the presence of NO can be obtained in advance using a coefficient k obtained by experiments.
That is, since it has been found through experiments that the SO ₂ concentration value detected by the SO ₂ concentration measuring instrument 15 in the presence of only NO and the NO concentration value are in a proportional relationship, by determining this proportional coefficient k, A measurement error can be obtained from the NO concentration in the exhaust gas.

Hereinafter, a method for obtaining the coefficient k will be described.
The coefficient k is obtained as unique to each measuring instrument, and is obtained using, for example, a coefficient detection device 31 as shown in FIG.

Air with the factor detection apparatus 31 directs a SO ₂ Gasubon 32 SO ₂ standard gas is filled, the NO gas cylinder 33 NO standard gas is filled, the SO ₂ gas and NO gas from these two gas cylinders 32 and 33 A gas diluter 34 for mixing [inert gas (zero gas) that does not include an error component of a measuring instrument such as air or high-purity nitrogen gas] and diluting to a predetermined concentration, and this gas diluter 34 directing the diluted gas in series, and SO ₂ concentration meter 35 for measuring the SO ₂ concentration in the diluted gas, which likewise consists of NO concentration meter 36 for measuring the NO concentration in the gas Yes.

In this coefficient detection device 31, after diluting the NO standard gas from the NO gas cylinder 33 to the gas diluter 34 by introducing air (or inert gas) into the gas diluter 34, the SO ₂ concentration measuring device 35 and the NO concentration measuring device 36. In each case, the SO ₂ concentration and the NO concentration are measured. And this measurement is performed by changing the concentration of NO gas in the gas diluter 34, and the result is represented by a graph as a straight line A shown by a solid line in FIG. FIG. 3 clearly shows that the two values are proportional to each other, and the slope of the straight line A corresponds to the value of the coefficient k. In FIG. 3, the horizontal axis represents the NO gas concentration value (0 to 10 ppm), and the vertical axis represents the SO ₂ gas concentration value (0 to 0.1 ppm) detected as a measurement error. Of course, as described above, the coefficient k is obtained for each measuring instrument. For example, as shown by a broken line B in FIG. 3, the value of the coefficient k is different if the measuring instrument is different.

  Therefore, the measurement error detector 16a can obtain the measurement error by multiplying the NO concentration value by the coefficient k. In this measurement error detection unit 16a, instead of performing the above-described multiplication, the NO concentration value and the measurement error corresponding to the coefficient k are held in a database (for example, a table) for the coefficient k. Alternatively, a measurement error corresponding to the NO concentration value may be obtained. Of course, various tables are prepared for the coefficient k.

Further, the coefficient detection device 31, but the SO ₂ gas cylinder 32 is connected to a gas diluter 34, measures the measurement error in the SO ₂ concentration meter 35 by using the this SO ₂ gas cylinder 32 and the NO gas cylinder 33 By doing so, it can be proved that the value of the coefficient k is almost correct.

Then, the concentration calculation unit 16b obtains a true SO ₂ concentration value based on the following equation (1).

True SO ₂ concentration value = actually measured SO ₂ concentration value−k × actually measured NO concentration value (1)
Further, the calibration means 17 includes a gas supply pipe 41 having one end connected to the exhaust gas introduction pipe 12 between the gas suction pump 24 and the second moisture removing device 25, and the other end of the gas supply pipe 41. each on-off valve 42 (42A, 42B, 42C) first connecting pipe 43 is provided _{(43A, 43B, 43C) N} 2 gas cylinder 44 connected via a, SO ₂ SO ₂ gas cylinder 45 standard gas-filled And NO gas cylinder 46 filled with NO standard gas and the second connecting pipe 47 (47A, 47B, 47C) connected to each of the first connecting pipes 43, NO gas, SO ₂ gas and N ₂ gas ( Or a gas diluter that supplies the diluted gas to the gas supply pipe 41 via a third connection pipe 48 provided with an on-off valve 50 in the middle. And a 9.

  The exhaust gas sampling means 10 is provided with a gas sampling tube 10a inserted in the flue 2 in a direction perpendicular to the flow thereof, and the lower side of the flow at the tip of the gas sampling tube 10a ( When the gas flows from the lower side to the upper side, the upper side is cut obliquely so that dust in the exhaust gas is not taken in as much as possible.

Further, the exhaust gas from the SO ₂ concentration measuring instrument 15 is guided to the exhaust gas discharge pipe 51 and returned to the flue or released to a safe place.
Next, measurement of the SO ₂ concentration in the exhaust gas in the exhaust gas discharge facility 4 will be described.

After the exhaust gas in the flue 2 is led to the NO concentration measuring device 13 through the exhaust gas supply pipe 11 and the exhaust gas introduction pipe 12 by the operation of the gas suction pump 24, the concentration of NO gas in the exhaust gas is measured here. The exhaust gas is guided to the SO ₂ concentration measuring device 15 through the gas connection pipe 14, and the concentration of SO ₂ is measured here.

The measured concentrations of NO gas and SO ₂ gas measured by both concentration measuring devices 13 and 15 are input to the SO ₂ concentration calculating means 16, and a measurement error is obtained by the measurement error detecting portion 16 a, and the concentration calculating portion. At 16b, the true SO ₂ concentration value is obtained by subtracting the measurement error from the actually measured concentration value based on the above equation (1).

At the time of measuring the SO ₂ concentration, the first and second moisture removing means 21 and 25 remove moisture that causes measurement errors, and the needle valve 26 uses the gas concentration measuring devices 13 and 15. Is adjusted so that the amount of gas guided to the gas reaches an appropriate value in the measuring instruments 13 and 15.

Further, since the measured concentration values in the concentration measuring devices 13 and 15 and the value of the coefficient k used when calculating the true SO ₂ concentration by the SO ₂ concentration calculating means 16 may change over time, these values may change. When the correction is made, the calibration means 17 is used.

That is, first, the open / close valve 42A is opened, and N ₂ gas is supplied to the concentration measuring devices 13 and 15, thereby performing zero calibration.
Then, after purging the gas piping system by N ₂ gas, as described in the portion of the factor detection apparatus 31, the gas diluter 49, to dilute the NO gas N ₂ with a standard gas (or atmosphere), The coefficient k may be obtained by measuring the SO ₂ concentration with the SO ₂ concentration measuring instrument 15. Of course, if it is different from the value of the coefficient currently used, the new coefficient is replaced.

The SO ₂ concentration measuring instrument 15 can also be calibrated by flowing SO ₂ standard gas from the SO ₂ gas cylinder 45.
As described above, when the concentration measuring device for measuring the concentration of the SO ₂ gas component in the exhaust gas is an ultraviolet fluorescent type and greatly affected by the presence of the NO gas component, a measurement error due to the NO gas component is detected. In addition, since the measurement error due to the presence of NO gas is subtracted from the measured SO ₂ concentration value, the SO ₂ gas concentration is set to a predetermined error by using an atmospheric gas concentration measuring device (gas analyzer). Measurement can be performed within the range, that is, with high accuracy.

  In addition, a gas analyzer, which is a concentration meter for the atmosphere, is detected in a room (also referred to as a cell) that detects gas components, and responds quickly when the flow rate of sample gas supplied to the room is large, and slow when it is small. It has the characteristic. Therefore, when two types of gas analyzers are used, the time from when the gas flows into each cell until the analysis result is output (referred to as delay time) is also different. When inputting, if the flow velocity of the gas input between the two gas analyzers changes due to various factors, the delay time also differs between the two analyzers. In order to analyze accurately, correction is performed in consideration of the delay time of the two gas analyzers. However, if the parallel configuration is used, the change in the delay time becomes different between the two analyzers. The correction as described above becomes difficult.

  However, as described above, by connecting both concentration measuring instruments in series, the flow rate does not change individually, so that there is an advantage that correction, that is, measurement error can be performed more accurately.

Incidentally, in the above embodiment has been previously placed towards the NO concentration meter 13 than SO ₂ concentration meter 15, conversely, towards the SO ₂ concentration meter 15, it is placed first Good.
Incidentally, in the foregoing embodiment, at least, the combustion exhaust gas containing the SO ₂ gas component and NO gas, has been described for measuring the concentration of SO ₂ gas component, of course, gas such flue gas It is not limited to ingredients.

  That is, when measuring the concentration of a certain gas component contained in a gas, even if it is affected by the presence of other gas components contained in the same gas, the embodiment described above is applied. A gas concentration measuring device can be applied.

  Briefly explaining this configuration, a gas component measuring device for measuring the concentration of a predetermined gas component contained in a gas, comprising: a first gas concentration measuring device for measuring the concentration of a gas component to be measured; The second gas concentration measuring instrument for measuring the concentration of the other gas component including the measurement error generated by measuring the other gas component in the concentration value measured by the first gas concentration measuring instrument. And a measurement error for detecting a measurement error of the other gas component measured by the first gas concentration meter by inputting a concentration value of the other gas component measured by the second gas concentration meter. The measurement error detected by the detection unit and the measurement error detection unit and the concentration value of the predetermined gas component measured by the first gas concentration measuring device are input, and the measurement error is calculated from the concentration value of the predetermined gas component. Subtract the specified gas A concentration calculating unit for obtaining a concentration value of the minute, and the first gas concentration measuring device and the second gas concentration measuring device are connected in series, and are taken out from any one of these gas concentration measuring devices. The gas is led to the other gas measuring instrument.

It is a figure which shows schematic structure of the gas concentration measuring apparatus which concerns on embodiment of this invention, and waste gas discharge equipment. It is a block diagram which shows schematic structure of the coefficient detection apparatus which calculates | requires the coefficient k in the gas concentration measuring device. And NO concentration value determined at the same coefficient detector is a graph showing the relationship between the SO ₂ concentration value.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas component measuring device 2 Flue 4 Exhaust gas discharge facility 10 Exhaust gas collection means 11 Exhaust gas supply pipe 12 Exhaust gas introduction pipe 13 NO concentration measuring device 15 SO ₂ concentration measuring device 16 SO ₂ concentration calculating means 16a Measurement error detecting portion 16b Concentration calculating portion 17 Calibration means

Claims (5)

A gas component measuring device that is guided by a gas introduction pipe and measures the concentration of a predetermined gas component contained in a gas to be measured using an ultraviolet fluorescent method ,
A first gas concentration measuring device for measuring the concentration of a gas component to be measured;
A second gas concentration measuring device that measures the concentration of the other gas component such that a measurement error caused by measuring another gas component is included in the concentration value measured by the first gas concentration measuring device. When,
The concentration value of the other gas component measured by the second gas concentration measuring device is inputted, and the measurement error caused by the other gas component measured by the first gas concentration measuring device is changed to the concentration value. A measurement error detection unit that detects using a proportional coefficient according to
The measurement error detected by the measurement error detector and the concentration value of the predetermined gas component measured by the first gas concentration measuring device are input, and the measurement error is subtracted from the concentration value of the predetermined gas component. A concentration calculation unit for obtaining a concentration value of a predetermined gas component;
Comprising calibration means for performing zero calibration in each gas concentration measuring instrument and a proportional coefficient used in the measurement error detector,
And the calibration means,
A gas supply pipe having one end connected to the exhaust gas introduction pipe;
A gas cylinder that is connected to the other end of the gas supply pipe via a first connection pipe and filled with a predetermined gas component, and a gas cylinder filled with another gas component;
The predetermined gas component, other gas components, and inert gas or air are guided through the second connection pipe connected to each first connection pipe to dilute to a predetermined concentration gas, and the diluted gas is A gas component measuring apparatus comprising a gas diluter that supplies the gas supply pipe via a three-connection pipe .   The first gas concentration measuring device and the second gas concentration measuring device are connected in series, and the gas taken out from any one of these gas concentration measuring devices is guided to the other gas measuring device. The gas component measuring device according to claim 1.   The gas component measuring device according to claim 1 or 2, wherein the gas to be measured is exhaust gas.   The measurement method in the gas concentration measuring device is an ultraviolet fluorescent method, and the gas component to be measured is sulfur dioxide and the other gas component causing measurement error is nitrogen monoxide. The gas component measuring device according to any one of the above. An exhaust gas channel, an exhaust gas sampling tube that collects part of the exhaust gas from the exhaust gas channel, and a gas component that guides the exhaust gas collected by the exhaust gas sampling tube and measures the concentration of a predetermined gas component using an ultraviolet fluorescent method It consists of a measuring device and
And this gas component measuring device,
At least a first gas concentration measuring device that measures the concentration of a gas component to be measured, and a measurement error that occurs due to measuring other gas components in the concentration value measured by the first gas concentration measuring device. A second gas concentration measuring device that measures the concentration of the other gas component, and the concentration value of the other gas component measured by the second gas concentration measuring device is input to input the first gas. A measurement error detector that detects a measurement error caused by the other gas component measured by the concentration measuring instrument, a measurement error detected by the measurement error detector, and the first gas concentration measuring instrument. The concentration calculation unit for inputting the concentration value of the predetermined gas component and subtracting the measurement error from the concentration value of the predetermined gas component to obtain the concentration value of the predetermined gas component, and the zero in each gas concentration measuring instrument Calibration and above Consist of a calibration means for calibrating the proportional coefficient used in measuring the error detection unit,
And the calibration means,
A gas supply pipe having one end connected to the exhaust gas introduction pipe;
A gas cylinder that is connected to the other end of the gas supply pipe via a first connection pipe and filled with a predetermined gas component, and a gas cylinder filled with another gas component;
The predetermined gas component, other gas components, and inert gas or air are guided through the second connection pipe connected to each first connection pipe to dilute to a predetermined concentration gas, An exhaust gas discharge facility comprising a gas diluter that supplies the gas supply pipe through a three-connection pipe .

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