JP2012215567A - Non-extractive gas analyzer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-extractive gas analyzer capable of simply switching a measurement state and a calibration state, easily performing calibration and performing correct calibration.SOLUTION: A gas analyzer 10 includes a conduit 12 which is composed of an outer cylinder 14 and an inner cylinder 16 respectively having openings 24, 26 formed on respective wall parts and can be switched to a measurement state that the opening 24 of the outer cylinder 14 is connected to the opening 26 of the inner cylinder 16 and gas 56 is allowed to flow into the inner cylinder 16 and a calibration state that the wall part of one of the outer cylinder 14 and the inner cylinder 16 blocks the opening of the other cylinder and gas is not allowed to flow into the inner cylinder 16 by rotating the outer cylinder 14 or the inner cylinder 16. In the measurement state, light is applied from the one-end side of the conduit 12 to gas in the inner cylinder 16 and transmitted light is detected to find out a component concentration in the gas. In the calibration state, calibration gas is filled in the inner cylinder 16, light is applied from the one-end side of the conduit 12 to the calibration gas in the inner cylinder 16 and transmitted light is detected to perform calibration.

Description

  The present invention relates to a gas analyzer for analyzing a gas flowing in a pipe such as a chimney or a duct. More specifically, the gas flowing in the pipe is irradiated with light without taking out the gas flowing in the pipe to the outside. The present invention relates to a sample non-suction sampling type gas analyzer that performs analysis.

  Conventionally, a gas analyzer of Patent Document 1 has been proposed as a sample non-suction sampling type gas analyzer that performs analysis by irradiating light to an exhaust gas flowing in a pipe such as a chimney or a duct. The gas analyzer disclosed in Patent Literature 1 irradiates a measurement gas with light in a laser gas analyzer that irradiates a measurement gas with laser light and measures the gas concentration based on a change in the amount of light due to light absorption of the laser light. A laser beam output unit that irradiates the measurement gas with a laser beam of such a wavelength, a laser beam input unit that receives the absorbed laser beam and outputs a detection signal, and processes the detection signal from the laser beam input unit And an arithmetic processing unit that identifies the gas (claim 7).

  In addition, JIS B 7993: 2008 stipulates a method that uses a gas cell for scale calibration as a calibration of an automatic measurement system for exhaust gas components using a non-sampled sampling analyzer. In this method, a calibration gas cell with a length of 1 m accurately measured is placed between the light emitter and the light detector of the measurement system (analyzer), and zero adjustment is performed by introducing zero gas into the calibration gas cell. Furthermore, the span gas is introduced into the calibration gas cell and the span adjustment operation is performed (7.3 calibration).

  Furthermore, the thing of patent document 2 is proposed as a gas analyzer of a sample non-suction collection system. The gas analyzer disclosed in Patent Document 2 emits laser light into a measurement gas and emits laser light from the laser diode in a laser gas analyzer that measures a gas concentration from a change in light amount due to light absorption of the laser light. Measurement is performed through branching means for branching the laser light in two directions, first and second light-projecting chambers having a predetermined length to which the branched laser light is incident and separated in an airtight manner, and the respective light-projecting chambers. First and second photodiodes that receive laser light that has passed through the gas, and first and second light-receiving chambers in which the respective photodiodes are arranged and have a predetermined length and are hermetically separated (see FIG. Claim 1).

JP 2007-170841 A JP 2010-286349 A

JIS B 7993: 2008 “Automatic measurement system of exhaust gas components by non-sampled sampling analyzer”

  However, since the gas analyzer of Patent Document 1 is removed from the pipes such as the chimney and the duct when performing calibration, and performs calibration as defined in JIS B 7993: 2008, Switching was cumbersome and calibration could not be performed easily. Moreover, although the gas analyzer of patent document 2 can calibrate without removing from a piping (sample line), when the diameter of piping is large, the light projection chamber and light receiving chamber into which zero gas and span gas are introduced The length (optical path length) is extremely shorter than the optical path length including the sample line, making it difficult to perform calibration accurately.

  The present invention has been made in view of the above-described circumstances, and can be easily switched between a measurement state and a calibration state, can be easily calibrated, and can be accurately calibrated. The object is to provide a gas analyzer of the type.

  In order to achieve the above object, the present invention provides a sample non-suction sampling type gas analyzer according to the following first to fourth inventions.

(First invention: Claim 1)
In the non-suction sampling type gas analyzer that analyzes the gas flowing in the pipe,
An outer cylinder in which one end side and the other end side are hermetically attached to the pipe wall of the pipe and an opening is formed in the wall, and an inner cylinder that is disposed inside the outer cylinder and has an opening formed in the wall A measurement state in which gas flows into the inner cylinder through communication between the opening of the inner cylinder and the opening of the outer cylinder by rotating one or both of the outer cylinder and the inner cylinder. And a conduit that can be switched to a calibration state in which one wall of the outer cylinder and the inner cylinder closes the other opening and gas does not flow into the inner cylinder,
In the measurement state, the gas in the inner cylinder is irradiated with light from one end side of the conduit, and by detecting the light transmitted through the gas on the other end side of the conduit, the component concentration in the gas is obtained,
In the calibration state, the inner cylinder is filled with a calibration gas, light is irradiated from one end of the conduit to the calibration gas in the inner cylinder, and the calibration gas is transmitted through the other end of the conduit. A sample non-suction sampling type gas analyzer characterized by performing calibration by detecting

(Second invention: Claim 2)
In the non-suction sampling type gas analyzer that analyzes the gas flowing in the pipe,
One end side is airtightly attached to the pipe wall of the pipe, the other end side is located in the pipe, an outer cylinder in which an opening is formed in the wall, and an inner part of the outer cylinder, and an opening in the wall The inner cylinder is formed with a mirror disposed inside the outer cylinder or the other end side of the inner cylinder, and by rotating one or both of the outer cylinder and the inner cylinder The measurement state in which the opening of the inner cylinder and the opening of the outer cylinder communicate with each other and the gas flows into the inner cylinder, and one wall of the outer cylinder and the inner cylinder closes the other opening, and the inner cylinder It has a conduit that can be switched to a calibration state in which gas does not flow in,
In the measurement state, the gas in the inner cylinder is irradiated with light from one end of the conduit, and the gas transmitted through the gas and reflected by the mirror is detected on one end of the conduit. Find the component concentration in
In the calibration state, while filling the calibration gas in the inner cylinder, irradiate the calibration gas in the inner cylinder from one end side of the conduit, and pass the calibration gas on one end side of the conduit, A non-sampled sampling gas analyzer that performs calibration by detecting light reflected by the mirror.

(Third invention: Claim 3)
In the non-suction sampling type gas analyzer that analyzes the gas flowing in the pipe,
One end side and the other end side are hermetically attached to the pipe wall of the pipe, and a tube having an opening formed in the wall portion, and a cylindrical shape that is disposed outside or inside the conduit and can advance and retreat along the axial direction. A measurement state in which gas flows into the conduit without closing the opening of the conduit by closing and moving the shutter, and the shutter closes the opening of the conduit and the gas enters the conduit. Can be switched to a calibration state that does not flow
In the measurement state, the gas in the conduit is irradiated with light from one end side of the conduit, and the concentration of the component in the gas is determined by detecting the light transmitted through the gas on the other end side of the conduit.
In the calibration state, the calibration gas is filled in the conduit, and the calibration gas in the conduit is irradiated with light from one end of the conduit, and the light transmitted through the calibration gas is detected on the other end of the conduit. A non-sampling sampling type gas analyzer characterized by performing calibration.

(Fourth Invention: Claim 4)
In the non-suction sampling type gas analyzer that analyzes the gas flowing in the pipe,
One end side is airtightly attached to the pipe wall of the pipe, the other end side is located in the pipe, an opening is formed in the wall part, and the pipe is disposed outside or inside the pipe, along the axial direction. And a cylindrical shutter that can be advanced and retracted, and a mirror is disposed inside the other end of the conduit, and by moving the shutter forward and backward, the opening of the conduit is not blocked by the shutter. It is possible to switch between a measurement state in which gas flows in and a calibration state in which the shutter is blocked by the shutter and the gas does not flow into the conduit.
In the measurement state, the gas in the conduit is irradiated with light from one end of the conduit, and the gas transmitted through the gas and reflected by the mirror is detected on the one end of the conduit. The component concentration of
In the calibration state, the calibration gas is filled in the conduit, the calibration gas in the conduit is irradiated with light from one end of the conduit, the calibration gas is transmitted through the one end of the conduit, and A non-suction sampling type gas analyzer that performs calibration by detecting light reflected by the mirror.

  In the gas analyzers of the first and second inventions, by rotating one or both of the outer cylinder and the inner cylinder of the conduit, the opening of the inner cylinder and the opening of the outer cylinder communicate with each other in the inner cylinder. It is possible to switch between a measurement state in which the gas flows in and a calibration state in which one wall portion of the outer cylinder and the inner cylinder closes the other opening and the gas does not flow into the inner cylinder. In the gas analyzers of the third and fourth inventions, the shutter is moved forward and backward to measure the measurement state in which gas flows into the conduit without closing the conduit opening. Can be switched to a calibration state in which the gas is blocked and gas does not flow into the conduit. Therefore, the gas analyzers of the first to fourth inventions can easily switch between the measurement state and the calibration state, and can easily perform calibration. In addition, since the optical path length in the measurement state matches the optical path length in the calibration state, calibration can be performed accurately.

  In the present invention, a light emitting cell having a cell window facing obliquely upward and having a light source accommodated therein, and a light receiving cell having a cell window facing obliquely upward and having a detector accommodated therein It can be set as the structure comprised. When the cell window is directed obliquely upward in this way, it is possible to prevent the measurement accuracy from being lowered due to dust or the like adhering to the cell window.

  The present invention comprises a light emitting cell having a cell window and containing a light source therein, and a light receiving cell having a cell window and containing a detector therein, and the gas in the measurement state is provided. At the time of analysis, the cleaning air can be constantly jetted toward the two cell windows. Thus, when cleaning air is constantly sprayed toward the cell window during measurement, it is possible to prevent dust and the like from adhering to the cell window and reducing measurement accuracy.

  Examples of components in the gas to be measured by the gas analyzer of the present invention include sulfur dioxide, nitrogen monoxide, dinitrogen monoxide, nitrogen dioxide, carbon monoxide, carbon dioxide, ammonia, hydrogen chloride, methane, moisture, and the like. Is mentioned.

  In addition, as a measurement method of the gas analyzer of the present invention, the sample gas is irradiated with monochromatic light from a semiconductor laser or the like adjusted to the specific absorption wavelength of the component to be measured, and the amount of transmitted light is measured to measure the concentration. The concentration is continuously detected by irradiating the sample gas with light such as a xenon lamp and spectrally analyzing the transmitted light and detecting the specific absorption wavelength light of the component to be measured. However, the present invention is not limited to these.

  The gas analyzer of the non-sampled sampling system according to the present invention can be easily switched between the measurement state and the calibration state, can be easily calibrated, and can be accurately calibrated.

It is a typical partial sectional view showing the measurement state of an example of the gas analyzer concerning the 1st invention. FIG. 2 is a schematic partial sectional view showing a calibration state of the gas analyzer of FIG. 1. It is a top view which shows the inner cylinder and outer cylinder of the gas analyzer of FIG. It is a typical partial sectional view showing the measurement state of an example of the gas analyzer concerning the 2nd invention. FIG. 5 is a schematic partial sectional view showing a calibration state of the gas analyzer of FIG. 4. It is a typical partial sectional view showing the measurement state of an example of the gas analyzer concerning the 3rd invention. FIG. 7 is a schematic partial sectional view showing a calibration state of the gas analyzer of FIG. 6. It is a typical partial sectional view showing the measurement state of an example of the gas analyzer concerning the 4th invention. It is a typical partial cross section figure which shows the calibration state of the gas analyzer of FIG.

(First embodiment)
1 and 2 are schematic partial sectional views showing an example of a gas analyzer according to the first invention. FIG. 1 is a diagram of a measurement state in which a sample gas is analyzed, and FIG. 2 is a calibration of the instrument. It is a figure of a calibration state.

  In the gas analyzer 10 of this example, 12 is a conduit, 14 is an outer cylinder of the conduit 12, and 16 is an inner cylinder of the conduit 12.

  The outer cylinder 14 has a cylindrical shape, and one end side and the other end side are respectively inserted into two mounting holes 20 formed in a state where they face each other on the pipe wall of a pipe (in this example, a chimney) 18 through which exhaust gas flows. Has been. A circular ring-shaped seal member 22 is fixed to both ends of the outer cylinder 14 protruding from the pipe 18, and the outer cylinder 14 is airtightly attached to the pipe wall of the pipe 18 by these seal members 22. Further, a rectangular slit (opening) 24 is formed on the lower side and the upper side of the wall portion of the outer cylinder 14 as shown in FIG. In FIG. 3A, only the upper slit 24 is displayed.

  The inner cylinder 16 has a cylindrical shape having the same length as the outer cylinder 14 and is disposed inside the outer cylinder 14. The outer diameter of the inner cylinder 16 is slightly smaller than the inner diameter of the outer cylinder 14, and the inner peripheral surface of the outer cylinder 14 and the outer peripheral surface of the inner cylinder 16 are in airtight contact. Further, as shown in FIG. 3B, a slit (opening) 26 having the same shape as the slit 24 of the outer cylinder 14 is formed in the wall portion of the inner cylinder 16. In FIG. 3B, only the upper slit 26 is displayed. Further, a handle 28 is attached to one end of the inner cylinder 16, and the inner cylinder 16 is rotated by turning the handle 28 by hand.

  The opening on the one end side of the inner cylinder 16 is airtightly closed by the support plate 30, and a light emitting cell 32 is airtightly attached to an attachment hole formed in the support plate 30, and a light source 34 is installed in the light emitting cell 32. Is housed. Further, a cell window 36 made of a transparent material and facing upward is provided on the tip side of the light emitting cell 32.

  The opening on the other end side of the inner cylinder 16 is airtightly closed by a support plate 38, and a light receiving cell 40 is airtightly attached to an attachment hole formed in the support plate 38. A container 42 is accommodated. A calculation display unit 43 is connected to the detector 42. Further, a cell window 44 made of a transparent material and facing obliquely upward is provided on the front end side of the light receiving cell 40.

  An air introduction tube 46 is hermetically connected to the support plate 30 at one end of the inner cylinder 16, and cleaning air is jetted from the tip of the air introduction tube 46 toward the cell window 36 of the light emitting cell 32. Yes. A calibration gas supply pipe 50 is connected to the air introduction pipe 46 via a three-way switching valve 48.

  An air introduction pipe 52 is connected to the support plate 38 on the other end side of the inner cylinder 16, and cleaning air is jetted from the tip of the air introduction pipe 52 toward the cell window 44 of the light receiving cell 40. . Further, a gas discharge pipe 54 is airtightly connected to the support plate 38 on the other end side of the inner cylinder 16.

The procedure for analyzing the exhaust gas flowing in the pipe 18 using the gas analyzer 10 of this example is as follows (1) to (3).
(1) By rotation of the inner cylinder 16, the slit 26 of the inner cylinder 16 and the slit 24 of the outer cylinder 14 are communicated (measurement state: see FIG. 1). In this state, the exhaust gas 56 flowing upward in the pipe 18 flows into the inner cylinder 16 through the lower slit 24 of the outer cylinder 14 and the lower slit 26 of the inner cylinder 16, and the upper side of the inner cylinder 16. It flows out of the inner cylinder 16 through the slit 26 and the upper slit 24 of the outer cylinder 14.
(2) The light 58 from the light source 34 is irradiated to the exhaust gas in the inner cylinder 16, and the light 58 that has passed through the exhaust gas is detected by the detector 42.
(3) The calculation display unit 43 calculates and displays the concentration of a single component or a plurality of components in the exhaust gas based on the signal from the detector 42.

  During the analysis of the exhaust gas described above, cleaning air is constantly injected from the tips of the air introduction pipes 46 and 52 toward the cell windows 36 and 44, so that dust or the like adheres to the cell windows 36 and 44 and the measurement accuracy decreases. To prevent. In this case, if the cleaning air injection port has a thin flat shape and the cleaning air is sprayed along the cell windows 36 and 44, the cleaning effect of the cell windows 36 and 44 is enhanced, and the inner cylinder 16 The inflow amount of the cleaning air into the inside, that is, the inflow amount of components other than the exhaust gas can be reduced, and more accurate measurement can be performed. Even if the cleaning air is jetted, the length of the optical path intersecting the air flow path is extremely short compared to the entire measurement optical path length (inner diameter of the pipe), and thus does not affect the measurement value.

The procedure for calibrating the gas analyzer 10 of the present example is as follows (A) to (D).
(A) The slit 24 of the outer cylinder 14 is closed by the wall of the inner cylinder 16 by the rotation of the inner cylinder 16 (calibration state: see FIG. 2). In this state, the exhaust gas 56 flowing in the pipe 18 does not flow into the inner cylinder 16.
(A) By switching the three-way switching valve 48, the calibration gas supply pipe 50 and the air introduction pipe 46 are communicated, and the calibration gas is introduced into the inner cylinder 16 through the calibration gas supply pipe 50 and the air introduction pipe 46. At the same time, exhaust gas in the inner cylinder 16 is discharged out of the inner cylinder 16 through the gas discharge pipe 54, whereby the inside of the inner cylinder 16 is replaced with a calibration gas. Examples of the calibration gas include zero gas and span gas. The above-described cleaning air may be zero gas. In this case, zero gas is measured without switching the three-way switching valve 48. Moreover, it is preferable that the span gas containing harmful components discharged from the inner cylinder 16 through the gas discharge pipe 54 is recovered by appropriate means.
(C) The light 58 from the light source 34 is applied to the calibration gas in the inner cylinder 16, and the light 58 that has passed through the calibration gas is detected by the detector 42.
(D) The calculation display unit 43 performs calibration (zero adjustment, span adjustment, etc.) based on the signal from the detector 42.

(Second Embodiment)
4 and 5 are schematic partial cross-sectional views showing an example of a gas analyzer according to the second invention. FIG. 4 is a diagram of a measurement state in which sample gas is analyzed, and FIG. 5 is a calibration of the instrument. It is a figure of a calibration state. 4 and 5, the same reference numerals are assigned to the same members and portions as those of the gas analyzer shown in FIGS. 1 and 2.

  In the gas analyzer 110 of this example, 112 indicates a conduit, 114 indicates an outer cylinder of the conduit 112, and 116 indicates an inner cylinder of the conduit 112.

  The outer cylinder 114 is cylindrical and has one end inserted into a mounting hole 20 formed in a pipe wall of a pipe (in this example, a chimney) 18 through which exhaust gas flows, and the other end located in the pipe 18. ing. A circular ring-shaped seal member 22 is fixed to one end portion of the outer cylinder 114 protruding from the pipe 18, and one end portion of the outer cylinder 114 is airtightly attached to the tube wall of the pipe 18 by the seal member 22. . Furthermore, rectangular slits (openings) 124 are formed below and above the wall portion of the outer cylinder 114.

  The inner cylinder 116 has a cylindrical shape having the same length as the outer cylinder 114 and is disposed inside the outer cylinder 114. The outer diameter of the inner cylinder 116 is slightly smaller than the inner diameter of the outer cylinder 114, and the inner peripheral surface of the outer cylinder 114 and the outer peripheral surface of the inner cylinder 116 are in airtight contact. A slit (opening) 126 having the same shape as the slit 124 of the outer cylinder 114 is formed in the wall of the inner cylinder 116. A concave mirror 118 that reflects light is airtightly fixed to the inner cylinder 116 inside the opening on the other end side of the inner cylinder 116. Furthermore, a handle 28 is attached to one end of the inner cylinder 116, and the inner cylinder 116 is rotated by turning the handle 28 by hand.

  The opening on the one end side of the inner cylinder 116 is airtightly closed by the support plate 30, and the light emitting cell 32 is airtightly attached to an attachment hole formed in the support plate 30, and the light source 34 is installed in the light emitting cell 32. Is housed. Further, a cell window 36 made of a transparent material and facing upward is provided on the tip side of the light emitting cell 32.

  A light receiving cell 40 is airtightly attached to an attachment hole formed in the support plate 30, and a detector 42 is accommodated in the light receiving cell 40. A calculation display unit 43 is connected to the detector 42. Further, a cell window 44 made of a transparent material and facing obliquely upward is provided on the front end side of the light receiving cell 40.

  An air introduction tube 46 is hermetically connected to the support plate 30, and cleaning air is jetted from the tip of the air introduction tube 46 toward the cell window 36 of the light emitting cell 32. A calibration gas supply pipe 50 is connected to the air introduction pipe 46 via a three-way switching valve 48.

  An air introduction pipe 52 is connected to the support plate 30, and cleaning air is jetted from the tip of the air introduction pipe 52 toward the cell window 44 of the light receiving cell 40. A gas discharge pipe 54 is connected to the support plate 30 in an airtight manner.

The procedure for analyzing the exhaust gas flowing in the pipe 18 using the gas analyzer 110 of this example is as follows (1) to (3).
(1) By rotating the inner cylinder 116, the slit 126 of the inner cylinder 116 and the slit 124 of the outer cylinder 114 are communicated (measurement state: see FIG. 4). In this state, the exhaust gas 56 flowing upward in the pipe 18 flows into the inner cylinder 116 through the lower slit 124 of the outer cylinder 114 and the lower slit 126 of the inner cylinder 116, and the upper side of the inner cylinder 116. It flows out of the inner cylinder 116 through the slit 126 and the upper slit 124 of the outer cylinder 114.
(2) The light 58 from the light source 34 is irradiated to the exhaust gas in the inner cylinder 116, and the light 58 that has passed through the exhaust gas and reflected by the mirror 118 is detected by the detector 42.
(3) The calculation display unit 43 calculates and displays the concentration of a single component or a plurality of components in the exhaust gas based on the signal from the detector 42.

  The point of constantly injecting the cleaning air from the tips of the air introduction pipes 46 and 52 toward the cell windows 36 and 44 during the analysis of the exhaust gas is the same as in the first embodiment, and thus the description thereof is omitted.

The procedure for calibrating the gas analyzer 110 of the present example is as follows (A) to (D).
(A) By the rotation of the inner cylinder 116, the slit 124 of the outer cylinder 114 is closed by the wall portion of the inner cylinder 116 (calibration state: see FIG. 5). In this state, the exhaust gas 56 flowing through the pipe 18 does not flow into the inner cylinder 116.
(A) By switching the three-way switching valve 48, the calibration gas supply pipe 50 and the air introduction pipe 46 are communicated, and the calibration gas is introduced into the inner cylinder 116 through the calibration gas supply pipe 50 and the air introduction pipe 46. At the same time, exhaust gas in the inner cylinder 116 is discharged out of the inner cylinder 116 through the gas discharge pipe 54, whereby the inside of the inner cylinder 116 is replaced with calibration gas. Other points in this step are the same as in the first embodiment.
(C) The light 58 from the light source 34 is applied to the calibration gas in the inner cylinder 116, and the light 58 that has passed through the calibration gas and reflected by the mirror 118 is detected by the detector 42.
(D) The calculation display unit 43 performs calibration (zero adjustment, span adjustment, etc.) based on the signal from the detector 42.

(Third embodiment)
6 and 7 are schematic partial sectional views showing an example of a gas analyzer according to the third invention. FIG. 6 is a diagram showing a measurement state in which sample gas is analyzed, and FIG. 7 is a calibration of the instrument. It is a figure of a calibration state. 6 and 7, the same reference numerals are assigned to the same members and portions as those of the gas analyzer shown in FIGS. 1 and 2.

  In the gas analyzer 210 of this example, 212 indicates a conduit and 214 indicates a shutter.

  The conduit 212 has a cylindrical shape, and one end side and the other end side thereof are respectively inserted into two mounting holes 20 formed in a state where they face each other on the pipe wall of a pipe 18 (chimney in this example) through which exhaust gas flows. ing. A circular ring-shaped seal member 22 is fixed to both ends of the conduit 212 protruding from the pipe 18, and the conduit 212 is airtightly attached to the pipe wall of the pipe 18 by these seal members 22. In this case, as the sealing member 22 on one end side of the conduit 212, a member having a function of attaching the conduit 212 to the pipe wall of the pipe 18 in an airtight manner and attaching the shutter 214 to the pipe wall of the pipe 18 so as to be airtight and movable back and forth is used. Has been. Further, rectangular slits (openings) 216 are formed below and above the wall portion of the conduit 212.

  The shutter 214 has a cylindrical shape, and is disposed outside the conduit 212 so as to advance and retreat along the axial direction. The inner diameter of the shutter 214 is slightly larger than the outer diameter of the conduit 212, and the outer peripheral surface of the conduit 212 and the inner peripheral surface of the shutter 214 are in airtight contact. Further, a handle 218 is attached to one end of the shutter 214, and the shutter 214 is moved forward and backward by moving the handle 218 forward and backward.

  The opening on one end side of the conduit 212 is airtightly closed by the support plate 30, and the light emitting cell 32 is airtightly attached to an attachment hole formed in the support plate 30, and the light source 34 is placed in the light emitting cell 32. Contained. Further, a cell window 36 made of a transparent material and facing upward is provided on the tip side of the light emitting cell 32.

  The opening at the other end of the conduit 212 is hermetically closed by the support plate 38, and the light receiving cell 40 is hermetically attached to an attachment hole formed in the support plate 38. 42 is accommodated. A calculation display unit 43 is connected to the detector 42. Further, a cell window 44 made of a transparent material and facing obliquely upward is provided on the front end side of the light receiving cell 40.

  An air introduction tube 46 is hermetically connected to the support plate 30 on one end side of the conduit 212, and cleaning air is jetted from the tip of the air introduction tube 46 toward the cell window 36 of the light emitting cell 32. . A calibration gas supply pipe 50 is connected to the air introduction pipe 46 via a three-way switching valve 48.

  An air introduction pipe 52 is connected to the support plate 38 on the other end side of the conduit 212, and cleaning air is jetted from the tip of the air introduction pipe 52 toward the cell window 44 of the light receiving cell 40. In addition, a gas discharge pipe 54 is airtightly connected to the support plate 38 on the other end side of the shutter 214.

The procedure for analyzing the exhaust gas flowing in the pipe 18 using the gas analyzer 10 of this example is as follows (1) to (3).
(1) The shutter 214 is moved backward so that gas flows into the conduit 212 without the shutter 214 closing the opening 216 of the conduit 212 (measurement state: see FIG. 6). In this state, the exhaust gas 56 flowing upward in the pipe 18 flows into the conduit 212 through the lower slit 216 of the conduit 212 and flows out of the conduit 212 through the upper slit 216 of the conduit 212.
(2) The light 58 from the light source 34 is irradiated to the exhaust gas in the conduit 212 and the light 58 that has passed through the exhaust gas is detected by the detector 42.
(3) The calculation display unit 43 calculates and displays the concentration of a single component or a plurality of components in the exhaust gas based on the signal from the detector 42.

  The point of constantly injecting the cleaning air from the tips of the air introduction pipes 46 and 52 toward the cell windows 36 and 44 during the analysis of the exhaust gas is the same as in the first embodiment, and thus the description thereof is omitted.

The procedure for calibrating the gas analyzer 210 of this example is as follows (A) to (D).
(A) The shutter 214 is moved forward so that the shutter 214 closes the opening 216 of the conduit 212 so that gas does not flow into the conduit 212 (calibration state: see FIG. 7). In this state, the exhaust gas 56 flowing in the pipe 18 does not flow into the conduit 212.
(A) By switching the three-way switching valve 48, the calibration gas supply pipe 50 and the air introduction pipe 46 are communicated, and the calibration gas is introduced into the conduit 212 through the calibration gas supply pipe 50 and the air introduction pipe 46. At the same time, the exhaust gas in the conduit 212 is discharged out of the conduit 212 through the gas exhaust pipe 54, thereby replacing the interior of the conduit 212 with the calibration gas. Examples of the calibration gas include zero gas and span gas. Other points in this step are the same as in the first embodiment.
(C) The calibration gas in the conduit 212 is irradiated with the light 58 from the light source 34 and the light 58 that has passed through the calibration gas is detected by the detector 42.
(D) The calculation display unit 43 performs calibration (zero adjustment, span adjustment, etc.) based on the signal from the detector 42.

(Fourth embodiment)
8 and 9 are schematic partial sectional views showing an example of a gas analyzer according to the fourth invention. FIG. 8 is a diagram showing a measurement state in which sample gas is analyzed, and FIG. 9 is a calibration of the instrument. It is a figure of a calibration state. 8 and 9, the same reference numerals are assigned to the same members and portions as those of the gas analyzer shown in FIGS. 1 and 2.

  In the gas analyzer 310 of this example, 312 is a conduit, and 314 is a shutter.

  The conduit 312 has a cylindrical shape, and one end is inserted into a mounting hole 20 formed in a pipe wall of a pipe (in this example, a chimney) through which exhaust gas flows, and the other end is located in the pipe 18. Yes. A circular ring-shaped seal member 22 is fixed to one end portion of the conduit 312 protruding from the pipe 18, and the one end portion of the conduit 312 is hermetically attached to the tube wall of the pipe 18 by the seal member 22. In this case, as the seal member 22, a member having a function of attaching the conduit 312 to the pipe wall of the pipe 18 in an airtight manner and attaching the shutter 314 to the pipe wall of the pipe 18 so as to be airtight and movable back and forth is used. Further, rectangular slits (openings) 316 are formed on the lower side and the upper side of the wall portion of the conduit 312. A concave mirror 318 that reflects light is airtightly fixed to the conduit 312 inside the opening at the other end of the conduit 312.

  The shutter 314 has a cylindrical shape, and is arranged outside the conduit 312 so as to advance and retreat along the axial direction. The inner diameter of the shutter 314 is slightly larger than the outer diameter of the conduit 312, and the outer peripheral surface of the conduit 312 and the inner peripheral surface of the shutter 314 are in airtight contact. A handle 318 is attached to one end of the shutter 314, and the shutter 314 moves forward and backward by moving the handle 318 forward and backward.

  The opening on the one end side of the conduit 312 is airtightly closed by the support plate 30, and the light emitting cell 32 is airtightly attached to the mounting hole formed in the support plate 30, and the light source 34 is placed in the light emitting cell 32. Contained. Further, a cell window 36 made of a transparent material and facing upward is provided on the tip side of the light emitting cell 32.

  A light receiving cell 40 is airtightly attached to an attachment hole formed in the support plate 30, and a detector 42 is accommodated in the light receiving cell 40. A calculation display unit 43 is connected to the detector 42. Further, a cell window 44 made of a transparent material and facing obliquely upward is provided on the front end side of the light receiving cell 40.

  An air introduction tube 46 is hermetically connected to the support plate 30, and cleaning air is jetted from the tip of the air introduction tube 46 toward the cell window 36 of the light emitting cell 32. A calibration gas supply pipe 50 is connected to the air introduction pipe 46 via a three-way switching valve 48.

  An air introduction pipe 52 is connected to the support plate 30, and cleaning air is jetted from the tip of the air introduction pipe 52 toward the cell window 44 of the light receiving cell 40. A gas discharge pipe 54 is connected to the support plate 30 in an airtight manner.

The procedure for analyzing the exhaust gas flowing in the pipe 18 using the gas analyzer 310 of this example is as follows (1) to (3).
(1) The shutter 314 is moved backward so that gas flows into the conduit 312 without the shutter 314 closing the opening 316 of the conduit 312 (measurement state: see FIG. 8). In this state, the exhaust gas 56 flowing upward in the pipe 18 flows into the conduit 312 through the lower slit 316 of the conduit 312 and flows out of the conduit 312 through the upper slit 316 of the conduit 312.
(2) The light 58 from the light source 34 is irradiated to the exhaust gas in the conduit 312, and the light 58 that has passed through the exhaust gas and reflected by the mirror 318 is detected by the detector 42.
(3) The calculation display unit 43 calculates and displays the concentration of a single component or a plurality of components in the exhaust gas based on the signal from the detector 42.

  The point of constantly injecting the cleaning air from the tips of the air introduction pipes 46 and 52 toward the cell windows 36 and 44 during the analysis of the exhaust gas is the same as in the first embodiment, and thus the description thereof is omitted.

The procedure for calibrating the gas analyzer 310 of this example is as follows (A) to (D).
(A) The shutter 314 is moved forward so that the shutter 314 closes the opening 316 of the conduit 312 so that gas does not flow into the conduit 312 (calibration state: see FIG. 9). In this state, the exhaust gas 56 flowing in the pipe 18 does not flow into the conduit 312.
(A) By switching the three-way switching valve 48, the calibration gas supply pipe 50 and the air introduction pipe 46 are communicated, and the calibration gas is introduced into the conduit 312 through the calibration gas supply pipe 50 and the air introduction pipe 46. At the same time, the exhaust gas in the conduit 312 is discharged out of the conduit 312 through the gas exhaust pipe 54, whereby the inside of the conduit 312 is replaced with a calibration gas. Examples of the calibration gas include zero gas and span gas. Other points in this step are the same as in the first embodiment.
(C) The light 58 from the light source 34 is irradiated onto the calibration gas in the conduit 312, and the light 58 that has passed through the calibration gas and reflected by the mirror 318 is detected by the detector 42.
(D) The calculation display unit 43 performs calibration (zero adjustment, span adjustment, etc.) based on the signal from the detector 42.

In addition, the gas analyzer of this invention is not limited to the said example, For example, various changes like the following 1-6 are possible.
1. In the first to fourth embodiments, the shape of the opening of the outer cylinder, the inner cylinder, and the conduit is a rectangular slit, but may be an arbitrary shape such as a square, a circle, or an ellipse.
2. In the first and second embodiments, the inner cylinder is rotated, but the outer cylinder may be rotated, or the outer cylinder and the inner cylinder may be rotated.
3. In the first and second embodiments, the inner cylinder is manually rotated, but may be rotated using a motor.
4). In the third and fourth embodiments, the conduit and the shutter are cylindrical, but other shapes such as a square cylinder such as a square cross section and a rectangular cross section may be used.
5. In the third and fourth embodiments, the shutter is disposed outside the conduit, but may be disposed inside.
6). In the third and fourth embodiments, the shutter is manually advanced and retracted, but may be advanced and retracted using a motor.

10 gas analyzer 12 conduit 14 outer cylinder 16 inner cylinder 18 piping (chimney)
24, 26 Slit (opening)
28 Handle 32 Light emitting cell 34 Light source 36 Cell window 42 Detector 40 Light receiving cell 44 Cell window 46 Air introduction pipe 50 Calibration gas supply pipe 52 Air introduction pipe 110 Gas analyzer 112 Conduit 114 Outer cylinder 116 Inner cylinder 124, 126 Slit ( Aperture)
118 Mirror 210 Gas Analyzer 212 Conduit 214 Shutter 216 Slit (Opening)
218 Handle 310 Gas analyzer 312 Conduit 314 Shutter 316 Slit (opening)
318 mirror

Claims (6)

In the non-suction sampling type gas analyzer that analyzes the gas flowing in the pipe,
An outer cylinder in which one end side and the other end side are hermetically attached to the pipe wall of the pipe and an opening is formed in the wall, and an inner cylinder that is disposed inside the outer cylinder and has an opening formed in the wall A measurement state in which gas flows into the inner cylinder through communication between the opening of the inner cylinder and the opening of the outer cylinder by rotating one or both of the outer cylinder and the inner cylinder. And a conduit that can be switched to a calibration state in which one wall of the outer cylinder and the inner cylinder closes the other opening and gas does not flow into the inner cylinder,
In the measurement state, the gas in the inner cylinder is irradiated with light from one end side of the conduit, and by detecting the light transmitted through the gas on the other end side of the conduit, the component concentration in the gas is obtained,
In the calibration state, the inner cylinder is filled with a calibration gas, light is irradiated from one end of the conduit to the calibration gas in the inner cylinder, and the calibration gas is transmitted through the other end of the conduit. A sample non-suction sampling type gas analyzer characterized by performing calibration by detecting In the non-suction sampling type gas analyzer that analyzes the gas flowing in the pipe,
One end side is airtightly attached to the pipe wall of the pipe, the other end side is located in the pipe, an outer cylinder in which an opening is formed in the wall, and an inner part of the outer cylinder, and an opening in the wall The inner cylinder is formed with a mirror disposed inside the outer cylinder or the other end side of the inner cylinder, and by rotating one or both of the outer cylinder and the inner cylinder The measurement state in which the opening of the inner cylinder and the opening of the outer cylinder communicate with each other and the gas flows into the inner cylinder, and one wall of the outer cylinder and the inner cylinder closes the other opening, and the inner cylinder It has a conduit that can be switched to a calibration state in which gas does not flow in,
In the measurement state, the gas in the inner cylinder is irradiated with light from one end of the conduit, and the gas transmitted through the gas and reflected by the mirror is detected on one end of the conduit. Find the component concentration in
In the calibration state, while filling the calibration gas in the inner cylinder, irradiate the calibration gas in the inner cylinder from one end side of the conduit, and pass the calibration gas on one end side of the conduit, A non-sampled sampling gas analyzer that performs calibration by detecting light reflected by the mirror. In the non-suction sampling type gas analyzer that analyzes the gas flowing in the pipe,
One end side and the other end side are hermetically attached to the pipe wall of the pipe, and a tube having an opening formed in the wall portion, and a cylindrical shape that is disposed outside or inside the conduit and can advance and retreat along the axial direction. A measurement state in which gas flows into the conduit without closing the opening of the conduit by closing and moving the shutter, and the shutter closes the opening of the conduit and the gas enters the conduit. Can be switched to a calibration state that does not flow
In the measurement state, the gas in the conduit is irradiated with light from one end side of the conduit, and the concentration of the component in the gas is determined by detecting the light transmitted through the gas on the other end side of the conduit.
In the calibration state, the calibration gas is filled in the conduit, and the calibration gas in the conduit is irradiated with light from one end of the conduit, and the light transmitted through the calibration gas is detected on the other end of the conduit. A non-sampling sampling type gas analyzer characterized by performing calibration. In the non-suction sampling type gas analyzer that analyzes the gas flowing in the pipe,
One end side is airtightly attached to the pipe wall of the pipe, the other end side is located in the pipe, an opening is formed in the wall part, and the pipe is disposed outside or inside the pipe, along the axial direction. And a cylindrical shutter that can be advanced and retracted, and a mirror is disposed inside the other end of the conduit, and by moving the shutter forward and backward, the opening of the conduit is not blocked by the shutter. It is possible to switch between a measurement state in which gas flows in and a calibration state in which the shutter is blocked by the shutter and the gas does not flow into the conduit.
In the measurement state, the gas in the conduit is irradiated with light from one end of the conduit, and the gas transmitted through the gas and reflected by the mirror is detected on the one end of the conduit. The component concentration of
In the calibration state, the calibration gas is filled in the conduit, the calibration gas in the conduit is irradiated with light from one end of the conduit, the calibration gas is transmitted through the one end of the conduit, and A non-suction sampling type gas analyzer that performs calibration by detecting light reflected by the mirror.   A light emitting cell having a cell window facing diagonally upward and having a light source accommodated therein, and a light receiving cell having a cell window facing diagonally upward and having a detector accommodated therein The sample non-suction sampling type gas analyzer according to any one of claims 1 to 4.   A light emitting cell having a cell window and containing a light source therein, and a light receiving cell having a cell window and containing a detector therein, and at the time of gas analysis in the measurement state, 6. The non-sampled sampling gas analyzer according to any one of claims 1 to 5, wherein cleaning air is constantly jetted toward both the cell windows.

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