Gas measuring device

Abstract

A gas measurement device (100) comprises: a sample gas line (ML) for dehumidifying a sample gas (M); a reference gas line (RL) for generating a reference gas (R) obtained by dehumidifying the sample gas after removing a gas component to be analyzed from the sample gas; a first switching part (8) for selectively supplying, to a sample cell (9), the gas passed through the reference gas line (RL) and the gas passed through the sample gas line (ML); a light source (10) for radiating light to the sample cell (9); and a detector (20) for detecting the intensity of light that has been radiated from the light source (10) to the sample cell (9) and transmitted through the sample cell (9). The gas component to be analyzed includes SO2 gas. The reference gas line (RL) includes a bubbling separator (11) for bubbling the sample gas (M) through water and removing SO2 gas from the sample gas (M), and a dehumidifying device (12) for dehumidifying the gas that has passed through the bubbling separator (11).

Description

Technical Field

[0001] The present disclosure relates to a gas measurement device.

Background Art

[0002] Japanese Patent Application Laid-Open No. 9-49797 (Patent Document 1) discloses an infrared gas analyzer that measures the concentration of a gas component by switching between a sample gas and a reference gas. In this infrared gas analyzer, a three-way valve is switched, and the sample gas and the reference gas are alternately supplied into the cell at a predetermined cycle. In parallel with this, a sector is rotated by a motor, and infrared light from a light source is intermittently irradiated into the cell. As a result, the detector alternately detects infrared light transmitted through the sample gas or the reference gas, and the gas component can be analyzed based on the output ratio between the detection output of the reference gas and the detection output of the sample gas. Further, Japanese Utility Model Laid-Open No. 59-29748 (Patent Document 2) discloses a two-path gas analyzer using two cells.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In an infrared gas analyzer, a measurement error occurs when a gas component whose infrared absorption band overlaps with that of the gas component to be measured (hereinafter referred to as an interference component) is contained in the sample gas. For example, when measuring sulfur dioxide (SO2) in combustion exhaust gas, HC and CO2 are present in the combustion exhaust gas as interference components.

[0005] In the infrared gas analyzer disclosed in Japanese Patent Application Laid-Open No. 9-49797 (Patent Document 1), air that does not contain SO2, which is the gas component to be measured, can be used as the reference gas. However, although not described in the said document, since air contains almost no HC and CO2, which are interference components for SO2 measurement, the output of the difference in infrared absorption between the sample gas and the reference gas may have a measurement error due to the influence of the interference components.

[0006] On the other hand, there is also a method of separately and continuously measuring the concentration of the interference component and correcting the error due to the influence of the interference component in real time using the measurement result. However, this method cannot be used unless the types and approximate concentrations of the interference components in the sample gas are known in advance. In addition, a configuration for detecting the concentration of the interference component in parallel is required, which increases the cost.

[0007] Furthermore, an interference countermeasure method can also be considered, such as an optical filter with a multilayer film that narrows the transmission wavelength band or a cell filled with a high concentration of interference gas installed in the optical path. Although this method has a certain interference reduction effect, it is often not sufficient, and some interference error remains. In addition, by putting such an optical filter in the optical path, the light is attenuated, resulting in a deterioration of the measurement accuracy.

[0008] An object of the present disclosure is to provide a gas measurement device that can improve the detection accuracy of SO2 while suppressing the development cost.

Means for Solving the Problems

[0009] The present disclosure relates to a gas measurement device for measuring a gas component to be analyzed in a sample gas. The gas measurement device includes a sample gas line for dehumidifying the sample gas, a reference gas line for generating a reference gas that is dehumidified after removing the gas component to be analyzed from the sample gas, a sample cell, a first switching unit for selectively supplying the gas that has passed through the reference gas line and the gas that has passed through the sample gas line to the sample cell, a light source for irradiating the sample cell with light, and a detection unit for detecting the light intensity of the light irradiated from the light source and transmitted through the sample cell. The gas component to be analyzed includes SO2 gas. The reference gas line includes a bubbling separator for bubbling the sample gas with water to remove SO2 gas from the sample gas, and a dehumidifying device for dehumidifying the gas that has passed through the bubbling separator.

Advantages of the Invention

[0010] In the gas measurement device according to the present disclosure, when the gas to be analyzed is water-soluble and the interfering component gas is water-insoluble, the gas to be analyzed is removed from the sample gas by a bubbling separator to obtain a reference gas. Therefore, since the same concentration of interfering component gas also exists in the reference gas, the influence of the interfering component gas can be canceled.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and their description will not be repeated.

[0013] [Embodiment 1] FIG. 1 is a diagram schematically showing the configuration of the gas measurement device according to Embodiment 1. FIG. 2 is a diagram schematically showing the configuration of the gas measurement device of the study example. The gas measurement device 100 in FIG. 1 has a different configuration from the gas measurement device 500 in FIG. 2 and the reference gas line RL. Hereinafter, the configuration of FIG. 1 will be described while comparing it with FIG. 2.

[0014] The gas measurement device 100 shown in FIG. 1 includes a sample gas line ML, a reference gas line RL, a switching unit 8, and a sample cell 9.

[0015] A sample gas M is introduced into the sample gas line ML. The sample gas line ML includes a drain separator 1 that separates drain water generated by natural cooling, a cooler 2 that dehumidifies the sample gas by cooling, and a drain pot 7 that stores the drain water separated by the drain separator 1 and the cooler 2.

[0016] The sample gas line ML further includes a filter 4 through which the sample gas M passes, a pump 5 that sends out the sample gas M, and a needle valve 6 that adjusts the flow rate of the sample gas M.

[0017] The above sample gas line ML has the same configuration in the study example of FIG. 2 and Embodiment 1 of FIG. 1.

[0018] In the study example of FIG. 2, air is introduced into the reference gas line RL. On the other hand, in Embodiment 1, the sample gas M is also introduced into the reference gas line RL. The reference gas line RL shown in FIG. 1 includes a bubbling separator 11 that bubbles the sample gas M with drain water generated by natural cooling, a cooler 12 that dehumidifies the sample gas (reference gas R) after passing through the bubbling separator 11 by cooling, and a drain pot 17 that stores the drain water separated by the bubbling separator 11 and the cooler 12. The bubbling separator 11 removes the water-soluble gas components in the sample gas M.

[0019] The reference gas line RL further includes a filter 14 through which the reference gas R passes, a pump 15 that sends out the reference gas R, and a needle valve 16 that adjusts the flow rate of the reference gas R.

[0020] As described above, in the present embodiment, as the reference gas R, a gas obtained by water bubbling the sample gas M to remove water-soluble SO2 is used. For water bubbling, a bubbling separator 11 or the like is used. When the combustion exhaust gas from a factory, incinerator, etc. is the sample gas M, since the sample gas M itself contains moisture and can be used for water bubbling, the bubbling separator 11 does not require a separate water supply. However, water may be supplied to the bubbling separator 11, or the drain water from the cooler 2 or 12 may be supplied to the bubbling separator 11.

[0021] The switching unit 8 and the sample cell 9 described below are common in FIGS. 1 and 2. The switching unit 8 includes a three-way valve 8M disposed in the sample gas line ML and a three-way valve 8R disposed in the reference gas line RL. The three-way valves 8M and 8R configure the flow path so that, according to the selection signal SEL, the gas that has passed through either the reference gas line RL or the sample gas line ML is sent to the sample cell 9, and the gas that has passed through the other is exhausted.

[0022] The gas measurement device 100 further includes a motor 19, a sector 18, a light source 10, an SO2 detector 20, and a control device 30.

[0023] The sample cell 9 has a gas inlet 9a and a gas outlet 9b. The sample gas M or the reference gas R is supplied into the sample cell 9 from the gas inlet 9a through the switching unit 8 and discharged from the gas outlet 9b. A light source 10 that emits infrared light is disposed at one end of the sample cell 9, and a SO2 detector 20 for detecting the infrared light transmitted through the sample cell 9 is disposed at the other end of the sample cell 9.

[0024] A sector 18 for interrupting the infrared light is provided between the light source 10 and the end of the sample cell 9. This sector 18 has a light-shielding portion and a light-transmitting portion. The sector 18 is configured to rotate about a sector rotation axis 18e. When the light-transmitting portion is above the sample cell 9, the infrared light is irradiated into the sample cell 9, and when the light-shielding portion is above the sample cell 9, the irradiation of the infrared light into the sample cell 9 is blocked. The control device 30 controls the rotational position of the sector 18 via the motor 19 and also controls the drive of the switching unit 8 by the selection signal SEL.

[0025] SO2 absorbs light of a specific wavelength (SO2: 7.4 μm) in the infrared region. Therefore, if the infrared absorption after passing through the measurement gas is measured by the SO2 detector 20 that is sensitive only to this wavelength, the concentration of SO2 can be measured.

[0026] The detection target gas in the sample gas is enclosed inside the SO2 detector 20, and the intensity of the infrared light of the frequency specific to the detection target gas is detected by the internal pressure change. Then, the control device 30 that receives the detection output of the SO2 detector 20 performs predetermined signal processing and calculates a concentration value indicating the concentration of the measurement gas in the sample gas.

[0027] If configured like the gas measurement device 500 of the comparative example shown in FIG. 2, the reference gas R does not contain HC and CO2 which are interference components, while the sample gas M contains interference components. The absorption wavelength band of C-H bond of HC, 7.2 μm, is close to the absorption wavelength band of SO2, 7.4 μm. Therefore, an error occurs in the measurement of the SO2 concentration due to the influence of HC. On the other hand, although the absorption wavelength band of CO2, 4.3 μm, is far from the absorption wavelength band of SO2, 7.4 μm, the concentration of CO2 in the sample gas is generally significantly larger than the concentration of SO2. Therefore, even with a slight overlap of the absorption wavelength bands, it affects as an interference component and an error occurs in the measurement of the SO2 concentration.

[0028] On the contrary, according to the gas measurement device 100 of Embodiment 1 shown in FIG. 1, interference components such as HC and CO2 with low solubility in water are hardly removed by water bubbling and are contained in the reference gas R. Therefore, in the difference in infrared absorption between the sample gas M and the reference gas R, the influence of the interference component is canceled. For this reason, the concentration of SO2 can be measured without being affected by the interference component. According to Embodiment 1, even when the interference component and its concentration are unknown, the influence of the interference component can be removed inexpensively and with high accuracy compared to the prior art.

[0029] [Modification Example of Embodiment 1] In Embodiment 1, a gas measurement device having a configuration in which a sample gas and a reference gas are alternately introduced into a sample cell is shown. However, a similar reference gas line may be applied to a gas measurement device using two cells, a sample cell and a reference cell.

[0030] FIG. 3 is a diagram schematically showing the configuration of a gas measurement device according to a modification example of Embodiment 1. The gas measurement device 100A shown in FIG. 3 includes a reference cell 59 instead of the switching unit 8 in the configuration of the gas measurement device 100 shown in FIG. 1. Since the configuration of the other parts of the gas measurement device 100A is the same as the configuration of the gas measurement device 100 shown in FIG. 1, the description will not be repeated.

[0031] The sample gas that has passed through the sample gas line ML is directly introduced into the sample cell 9. The reference cell 59 has a gas inlet 59a and a gas outlet 59b. The reference gas that has passed through the reference gas line RL is introduced into the reference cell 59 from the gas inlet 59a of the reference cell 59, and then exhausted from the gas outlet 59b. The SO2 detector 20 detects the difference between the intensity of the infrared light that has passed through the sample cell 9 and the intensity of the infrared light that has passed through the reference cell 59.

[0032] Thus, even in a gas measuring device that uses two cells, namely a sample cell and a reference cell, the influence of interference components can be removed in the same way.

[0033] [Embodiment 2] In Embodiment 1, an SO2 measuring device that uses, as a reference gas, a sample gas in which SO2 has been dissolved and removed by water bubbling in an infrared gas analyzer that measures by switching between a sample gas and a reference gas was described. However, there is also a need for a multi-component measuring device that can simultaneously measure components other than SO2 in a gas measuring device.

[0034] When attempting to simultaneously measure NOx (=NO + NO2), CO, and CO2 in addition to SO2 with a single measuring device, in the reference gas generation method according to Embodiment 1, since NO, CO, and CO2 with poor water solubility are not removed by the bubbling separator, there is a problem that they are not suitable as reference gases for measuring NOx, CO, and CO2.

[0035] In particular, it is difficult to continuously and stably remove NO and CO2 to a level that can be used as a reference gas (i.e., a removal rate of 99 . 9% or more with respect to the atmospheric concentration). For this reason, it is difficult to configure a multi-component gas measuring device with the configuration of Embodiment 1 as it is. Although it is also conceivable to oxidize CO to CO2 with an oxidation catalyst and remove it, there are problems in maintaining the required oxidation efficiency stably over a long period due to catalyst poisoning and the like.

[0036] Therefore, in order to perform multi-component measurement using the gas measurement device of Embodiment 1 with reduced interference effects, it is necessary to separately install continuous measurement devices for NOx, CO, and CO2. However, there are problems such as increased costs and large installation spaces for the measurement devices, resulting in poor installation efficiency.

[0037] Therefore, in Embodiment 2, a three-way valve 13 is provided downstream of the bubbling separator 11, and the gas (R1) formed by the sample gas passing through the bubbling separator 11 and the atmosphere (R2) are switched and alternately used as the reference gas.

[0038] FIG. 4 is a diagram schematically showing the overall configuration of the gas measurement device of Embodiment 2. The gas measurement device 200 shown in FIG. 4 has a reference gas line RLA instead of the reference gas line RL in the configuration of the gas measurement device 100 shown in FIG. 1, and includes a detection unit 20A instead of the SO2 detector 20. For the sample gas line ML, switching unit 8, sample cell 9, motor 19, sector 18, and light source 10, since the gas measurement device 200 is common to the gas measurement device 100, the description will not be repeated.

[0039] The reference gas line RLA shown in FIG. 4 is different from the reference gas line RL shown in FIG. 1 in that a three-way valve 13 is added between the bubbling separator 11 and the cooler 12. The three-way valve 13 selects either the reference gas R1 that has passed through the bubbling separator 11 or the reference gas R2 that is the atmosphere, according to the selection signal SEL2 given from the control device 30, and sends it to the cooler 12. Since the bubbling separator 11, cooler 12, drain pot 17, filter 14, pump 15, and needle valve 16 are the same as those in FIG. 1, the description will not be repeated.

[0040] The detection unit 20A includes an SO2 detector 22, an NO detector 23, a CO detector 24, and a CO2 detector 25, which respectively detect SO2, NO, CO, and CO2 as detection targets.

[0041] SO2, NO, CO, and CO2 each absorb light of specific wavelengths in the infrared region (SO2: 7.4 μm, NO: 5.3 μm, CO: 4.6 μm, CO2: 4.3 μm). Therefore, by measuring the infrared absorption after passing through the measurement gas with detectors that are sensitive only to these respective wavelengths, the concentration of each component can be measured.

[0042] Each detector has the detection target gas in the sample gas sealed inside, and detects the intensity of infrared light at the frequency specific to the detection target gas based on the internal pressure change. Then, the control device 30 that receives the detection output from the detection unit 20A performs predetermined signal processing and calculates the concentration value indicating the measurement gas concentration in the sample gas.

[0043] Figure 5 is a diagram for explaining the reading of the detector signal. A selection signal SEL is input to the switching unit 8, and a selection signal SEL2 is input to the three-way valve 13.

[0044] In one example, as shown in Figure 5, the reference gas R1 and the reference gas R2 are switched every 20 seconds by the selection signal SEL2. Also, the sample gas M and the reference gas R are switched every 10 seconds by the selection signal SEL.

[0045] In this way, the detection signals of the reference gas R1 and the reference gas R2 are alternately read with the detection signal of the sample gas M in between. In each period of times t0~t2, t4~t6, t8~t10, …, the control device 30 measures the SO2 concentration based on the difference between the detection signal of the first half of the reference gas R1 detected by the SO2 detector 22 and the detection signal of the sample gas M in the second half.

[0046] Also, in each period of times t2~t4, t6~t8, …, the measurements of NO, CO, and CO2 are performed. In the first half of each period, each of the NO detector 23, the CO detector 24, and the CO2 detector 25 outputs the detection signal of the reference gas R2 to the control device 30, and in the second half of each period, each of the NO detector 23, the CO detector 24, and the CO2 detector 25 outputs the detection signal of the sample gas M to the control device 30. The control device 30 measures the NO, CO, and CO2 concentrations based on the difference between the signal in the first half and the signal in the second half.

[0047] In the above description, an example in which the measurement of the SO2 concentration and the measurement of NO, CO, and CO2 are performed alternately has been described. However, each of the detection signals of the reference gas R1 and the reference gas R2 may be stored until the next measurement timing, and the measurement of all components of the sample gas M may be performed in each cycle using the latest stored reference gases R1 and R2 simultaneously.

[0048] As it is, the configuration of Embodiment 1 could not form a highly accurate multi-component meter. However, in Embodiment 2, while using the interference removal technique during SO2 concentration measurement, multi-component measurement becomes possible with one measuring device. For this reason, a multi-component meter including a low-cost, small installation space, and low-interference SO2 meter becomes possible.

[0049] [Modification Example 1 of Embodiment 2] In FIG. 4, water-soluble NO2 is converted to NO by the converter 3 in the sample gas line ML. On the other hand, water-soluble NO2 in the reference gas R1 is dissolved and removed by the bubbling separator 11 in the reference gas line RLA.

[0050] For this reason, it is shown that the NO concentration corresponding to the water-soluble NO2 component in the detection signal of the reference gas R1 (referred to as the first signal) obtained from the NO detector 23 at times t0 to t1 in FIG. 5 is lower than the detection signal of the sample gas M (referred to as the second signal) obtained from the NO detector 23 at times t1 to t2.

[0051] Therefore, in the control device 30, the NO2 concentration can be measured secondarily by the difference between the second signal and the first signal obtained from the NO detector 23. Utilizing this, a multi-component gas measuring device capable of measuring the NO2 concentration can also be realized.

[0052] [Modification Example 2 of Embodiment 2] In Embodiment 2, a gas measuring device having a configuration in which a sample gas and a reference gas are alternately introduced into a sample cell has been shown. However, it may be applied to a gas measuring device using two cells, a sample cell and a reference cell, with a similar reference gas line.

[0053] FIG. 6 is a diagram schematically showing the configuration of a gas measurement apparatus according to a modification of Embodiment 2. The gas measurement apparatus 200A shown in FIG. 6 includes a reference cell 59 instead of the switching unit 8 in the configuration of the gas measurement apparatus 200 shown in FIG. 4 In the configuration of the gas measurement apparatus 200 shown in FIG., The other parts of the configuration of the gas measurement apparatus 200A are the same as those of the gas measurement apparatus 200 shown in FIG., And thus the description will not be repeated. 4 Since it is the same as the configuration of the gas measurement apparatus 200 shown in FIG., The description will not be repeated.

[0054] The sample gas that has passed through the sample gas line ML is directly introduced into the sample cell 9. The reference cell 59 has a gas inlet 59a and a gas outlet 59b. The reference gas that has passed through the reference gas line RL A is introduced into the reference cell 59 from the gas inlet 59a of the reference cell 59, and then exhausted from the gas outlet 59b. The SO2 detector 20 detects the difference between the intensity of the infrared light transmitted through the sample cell 9 and the intensity of the infrared light that has passed through the reference cell 59.

[0055] Thus, even in a gas measurement apparatus using two cells, a sample cell and a reference cell, it is possible to perform multi-component measurement with a single measurement apparatus while similarly using an interference removal technique during SO2 concentration measurement.

[0056] [Aspect] It will be understood by those skilled in the art that the exemplary embodiments described above are specific examples of the following aspects.

[0057] (Item 1) The present disclosure relates to a gas measurement device for measuring a gas component to be analyzed in a sample gas. The gas measurement device includes a sample gas line for dehumidifying the sample gas, a reference gas line for generating a reference gas that is dehumidified after removing the gas component to be analyzed from the sample gas, a sample cell, a sample gas switching unit that selectively supplies the gas that has passed through the reference gas line and the gas that has passed through the sample gas line to the sample cell, a light source that irradiates the sample cell with light, and a detection unit that detects the light intensity of the light irradiated from the light source to the sample cell and transmitted through the sample cell. The gas component to be analyzed includes SO2 gas. The reference gas line includes a bubbling separator that bubbles the sample gas with water to remove SO2 gas from the sample gas, and a dehumidifying device that dehumidifies the gas that has passed through the bubbling separator.

[0058] (Item 2) Another embodiment of the present disclosure relates to a gas measurement device for measuring a gas component to be analyzed in a sample gas. The gas measurement device includes a sample gas line for dehumidifying the sample gas, a reference gas line for generating a reference gas that is dehumidified after removing the gas component to be analyzed from the sample gas, a sample cell into which the gas that has passed through the sample gas line is introduced, a reference cell into which the gas that has passed through the reference gas line is introduced, a light source that irradiates the sample cell and the reference cell with light, and a detection unit that detects the light intensity of the light irradiated from the light source to the sample cell and transmitted through the sample cell and the light intensity of the light irradiated from the light source to the reference cell and transmitted through the reference cell. The gas component to be analyzed includes SO2 gas. The reference gas line includes a bubbling separator that bubbles the sample gas with water to remove SO2 gas from the sample gas, and a dehumidifying device that dehumidifies the gas that has passed through the bubbling separator.

[0059] According to the above configuration, when the gas to be analyzed is water-soluble and the interfering component gas is water-insoluble, the gas measurement device removes the gas to be analyzed from the sample gas with a bubbling separator to obtain a reference gas. Therefore, since the same concentration of interfering component gas also exists in the reference gas, the influence of the interfering component gas can be canceled.

[0060] (Item 3) In Item 1 or Item 2, the bubbling separator uses the drain water generated when the sample gas is cooled as the water for bubbling. When analyzing combustion gas, since moisture condenses from the gas by natural cooling and water is supplied to the bubbling separator, there is no need to supply water to the bubbling separator from the outside.

[0061] (Item 4) In Item 1 or Item 2, the gas component to be analyzed further includes at least one of NO gas, CO gas, and CO2 gas. The reference gas line is arranged between the bubbling separator and the dehumidifying device, and further includes a reference gas switching unit that selectively supplies the gas that has passed through the bubbling separator and the atmosphere to the dehumidifying device.

[0062] (Item 5) In Item 4, the light irradiated by the light source to the sample cell is infrared light. The detection unit includes a first detector that detects the concentration of SO2 gas and a second detector that detects the concentration of at least one of NO gas, CO gas, and CO2 gas.

[0063] By adopting the above configuration, a multi-component gas measurement device capable of accurately measuring a water-soluble gas to be analyzed and further measuring a water-insoluble gas to be analyzed can be realized.

[0064] (Item 6) In Item 1 or Item 2, the gas component to be analyzed includes NO gas and NO2 gas. The sample gas line includes a cooler that cools and dehumidifies the sample gas and a converter that converts NO2 gas in the gas that has passed through the cooler into NO gas. The gas measurement device further includes a processing device that measures the concentration of NO2 gas based on the output of the detection unit when the gas that has passed through the sample gas line is introduced into the sample cell and the output of the detection unit when the gas that has passed through the bubbling separator is introduced into the sample cell.

[0065] (Item 7) In Item 6, the light irradiated by the light source to the sample cell is infrared light. The detection unit includes a first detector that detects the concentration of SO2 gas and a second detector that detects the concentration of NO gas.

[0066] By adopting the above configuration, it is possible to realize a multi-component gas measuring device that can secondarily measure the concentration of NO2 gas, which is usually difficult to detect separately from NO gas.

[0067] The embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. The scope of the present invention is shown not by the description of the above embodiments but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Explanation of Reference Numerals

[0068] 1 Drain separator, 2, 12 Cooler, 3 Converter, 4, 14 Filter, 5, 15 Pump, 6, 16 Needle valve, 7, 17 Drain pot, 8 Sample gas switching unit, 8M, 8R, 13 Three-way valve, 9 Sample cell, 9a, 59a Gas inlet, 9b, 59b Gas outlet, 10 Light source, 11 Bubbling separator, 18 Sector, 18e Sector rotation shaft, 19 Motor, 20, 22, 23, 24, 25 Detector, 20A Detection unit, 30 Control device, 59 Reference cell, 100, 100A, 200, 200A, 500 Gas measuring device, ML Sample gas line, RL, RLA Reference gas line.

Claims

1. A gas measurement device for measuring a gas component to be analyzed in a sample gas, comprising: a sample gas supply line for supplying the sample gas; a sample gas line having a first dehumidifying unit for dehumidifying the sample gas supplied from the sample gas supply line; an analysis target gas component removing unit for removing the gas component to be analyzed from the sample gas supplied from the sample gas supply line, and a second dehumidifying unit for dehumidifying the gas after the gas component to be analyzed has been removed by the analysis target gas component removing unit, and a reference gas line for generating a reference gas; a sample cell; a sample gas switching unit for selectively supplying the gas that has passed through the reference gas line and the gas that has passed through the sample gas line to the sample cell; a light source for irradiating the sample cell with light; a detection unit for detecting the light intensity of the light irradiated from the light source to the sample cell and transmitted through the sample cell, The gas component to be analyzed includes SO ２ gas, The gas component removal unit for analysis subjects bubbles the sample gas with water to remove SO ２ gas from the sample gas, and is a bubbling separator for removing the gas. wherein the second dehumidifying unit is a dehumidifying device for dehumidifying the gas that has passed through the bubbling separator.

2. A gas measurement device for measuring a gas component to be analyzed in a sample gas, comprising: a sample gas supply line for supplying the sample gas; a sample gas line having a first dehumidifying unit for dehumidifying the sample gas supplied from the sample gas supply line; an analysis target gas component removing unit for removing the gas component to be analyzed from the sample gas supplied from the sample gas supply line, and a second dehumidifying unit for dehumidifying the gas after the gas component to be analyzed has been removed by the analysis target gas component removing unit, and a reference gas line for generating a reference gas; a sample cell into which the gas that has passed through the sample gas line is introduced; a reference cell into which the gas that has passed through the reference gas line is introduced; a light source for irradiating the sample cell and the reference cell with light; a detection unit for detecting the light intensity of the light irradiated from the light source to the sample cell and transmitted through the sample cell and the light intensity of the light irradiated from the light source to the reference cell and transmitted through the reference cell, The gas component to be analyzed includes SO ２ gas and The analysis target gas component removal unit bubbles the sample gas with water to remove SO ２ gas from the sample gas, and is a bubbling separator for removing gas. wherein the second dehumidifying unit is a dehumidifying device for dehumidifying the gas that has passed through the bubbling separator.

3. The gas measurement device according to claim 1, wherein the bubbling separator uses drain water generated when the sample gas is cooled as the water used for bubbling.

4. The gas components to be analyzed further include at least one of NO gas, CO gas, and CO ２ gas, The reference gas line is The gas measurement device according to claim 1, further comprising a reference gas switching unit disposed between the bubbling separator and the dehumidifying device, and selectively supplying the gas that has passed through the bubbling separator and the atmosphere to the dehumidifying device.

5. The light irradiated by the light source to the sample cell is infrared light, The detection unit, SO ２ a first detector that detects the concentration of the gas, NO gas, CO gas, CO ２ The gas measuring device according to claim 4, comprising a second detector that detects the concentration of at least one of the gases.

6. The gas components to be analyzed include NO gas and NO ２ gas, and The first dehumidifying unit is a cooler that cools and dehumidifies the sample gas, The sample gas line further has a converter that converts NO ２ gas among the gas that has passed through the cooler into NO gas. ２ ​ The gas measurement device, Based on the output of the detection unit when the gas passing through the sample gas line is introduced into the sample cell and the output of the detection unit when the gas passing through the bubbling separator is introduced into the sample cell, NO ２ The gas measurement device according to claim 1, further comprising a central processing unit that measures the concentration of gas.

7. The light irradiated by the light source to the sample cell is infrared light, The detection unit, SO ２ a first detector that detects the concentration of the gas, The gas measurement device according to claim 6, further comprising a second detector that detects the concentration of NO gas.

8. The bubbling separator uses the drain water generated when the sample gas is cooled as the water used for the bubbling. The gas measurement device according to claim 2.

9. The gas components to be analyzed further include at least one of NO gas, CO gas, and CO ２ gas. The reference gas line, The gas measurement device according to claim 2, further comprising a reference gas switching unit disposed between the bubbling separator and the dehumidifying device, and selectively supplying the gas that has passed through the bubbling separator and the atmosphere to the dehumidifying device.

10. The light irradiated by the light source to the sample cell is infrared light, The detection unit, SO ２ a first detector that detects the concentration of the gas, NO gas, CO gas, CO ２ The gas measuring device according to claim 9, comprising a second detector that detects the concentration of at least one of the gases.

11. The gas components to be analyzed include NO gas and NO ２ gas, The first dehumidifying unit is a cooler that cools and dehumidifies the sample gas, The sample gas line further has a converter that converts NO ２ gas among the gas that has passed through the cooler into NO gas. ２ ​ The gas measurement device, Based on the output of the detection unit when the gas passing through the sample gas line is introduced into the sample cell and the output of the detection unit when the gas passing through the bubbling separator is introduced into the reference cell, NO ２ The gas measurement device according to claim 2, further comprising a central processing unit that measures the concentration of the gas.

12. The light irradiated by the light source to the sample cell is infrared light, The detection unit, SO ２ a first detector that detects the concentration of the gas, The gas measurement device according to claim 11, further comprising a second detector that detects the concentration of NO gas.

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