KR101317058B1 - Calibrating device for in-situ stack gas analyzer - Google Patents

Abstract

PURPOSE: A device for automatically calibrating an in-situ gas measuring instrument is provided to remove the complexity of configuration thereof caused by converting an optical path, and to reduce the distortion of the optical path caused by reflection, thereby stably and accurately obtaining a measurement value. CONSTITUTION: A device for automatically calibrating an in-situ gas measuring instrument includes an outer casing (12), a retro-reflective body (14), a reflection releasing unit, and a reference gas feeding part (16). The main body (2) of the device has a light emitting part (6) and a probe (4), and the outer casing between the light emitting part and the probe has a first window (20) and a second window (22). The retro-reflective body inside the outer casing retro-reflects a light which penetrates through the first window. The reflection releasing unit manipulates the retro-reflective body so that the light penetrating through the first window turns to the probe through the second window, thereby allowing the retro-reflective body to step aside from an optical path. The reference gas feeding part feeds reference gas to inside the outer casing.

Description

     Calibrating device For In-Situ Stack Gas Analyzer

The present invention relates to an apparatus for measuring and analyzing the exhaust gas in the stack duct, and more particularly, the in-situ gas meter having a means for measuring, analyzing and self-correcting the exhaust gas discharged to the outside through the stack duct It relates to an automatic calibration device.

The in-situ gas detector is an apparatus for optically measuring and analyzing the component characteristics of various exhaust gases discharged to the outside through the inside of the industrial stack duct. The conventional in-situ gas meter is equipped with an automatic calibration device to continuously measure and analyze continuously for long term use. In addition, the spectroscopic unit requires periodic calibration for accurate measurement, which is cumbersome in that the spectroscopic unit of the in-situ gas meter needs to be separated from the stack duct. It was difficult. In this regard, Korean Patent Registration No. 10-1129541 proposes a gas meter that can periodically calibrate the measurement function of various exhaust gases passing through the stack duct continuously without separating the spectroscopic unit from the stack duct. According to this, the light irradiated from the light source by the rotating filter wheel is selectively guided to the probe or the calibration cell to continuously and precisely analyze the constituent characteristics of the exhaust gas in the stack duct and automatically control the controller without separating it from the probe or the duct. Gas concentration can be corrected.

However, according to the above patent, in order to send the light to the calibration cell, the optical path is converted to 90 °, and then the light is returned and analyzed by returning along the same path. In the course of the rotational movement may cause mechanical instability may cause the optical signal to be distorted.

An object of the present invention for the above problem is to provide an in-situ gas meter for measuring and analyzing the composition and concentration of the exhaust gas discharged to the outside through the stack duct; It is equipped with an automatic calibration device, and the light path is changed to a horizontal structure instead of a vertical structure, thereby simplifying and simplifying the optical noise and having a mechanically stable structure to obtain more accurate measurement values. It is an object to provide an automatic calibration device.

The above purpose is to be fixed to the wall of the duct through which the exhaust gas passes, the light emitting unit for emitting light toward the interior of the duct, and the gas measuring unit for measuring the exhaust gas passing through the duct through the incident light A measuring instrument body comprising; One end penetrates through the wall of the duct and is connected to the measuring instrument body, and the other end extends to cross the inside of the duct, and the light emitted from the light emitting part passes through the inner space of the duct, and then the measuring instrument body. An in-situ gas meter comprising a probe for guiding to be incident to the gas;

It is for calibrating the gas measuring unit of the measuring device using the light emitted from the measuring device main body;

A cylindrical body interposed between the light emitting part of the measuring device and the probe, and provided with a first window through which the light radiated from the light emitting part flows, and the light passing through the first window on the other side passes through the probe. An outer casing in which a second window is provided; A reflex reflector installed inside the outer casing to reflexively reflect the light introduced through the first window; Anti-reflecting means for manipulating the return reflector so that light introduced through the first window can be directed to the probe through the second window; It is achieved by the automatic calibration device of the in-situ gas meter comprising a standard gas supply for supplying a standard gas inside the outer casing.

According to a feature of the invention, the standard gas supply unit;

An inner casing installed between the first window and the reflex reflector, the third casing installed in a direction toward the first window and a fourth window installed in a direction toward the regressive reflector; A gas inlet pipe installed through the outer casing and the inner casing; A gas discharge pipe installed through the inner casing and the outer casing; It may include; gas heating means for heating the standard gas introduced as installed in the gas inlet pipe.

According to another feature of the invention, the gas heating means is a heating case that the gas inlet pipe is connected to one end and the gas supply pipe is installed at the other end; An electric heater installed inside the heating case; A spiral body installed inside the heating case to heat the gas introduced into the heating case while passing in a spiral shape; It may include; a first temperature sensor for measuring the temperature of the standard gas passing through the heating case.

According to another feature of the invention, the reflex reflector may be a corner cube prism.

According to another feature of the invention, the reflection release means comprises a rotation axis which is installed in the outer casing to be perpendicular to the optical path; The reflex reflector is installed on the rotating shaft to enable a rotational movement about the rotating shaft; When the reflex reflector rotates about the rotation axis, it can be moved away from the optical path.

According to another feature of the present invention, the first and second windows may be inclined at an angle of 80 ° to 87 ° with respect to the optical path passing through the outer casing.

The reflection releasing means is a retroreflective body is installed in the outer casing to enable a linear reciprocating motion in a direction perpendicular to the optical path; By including a maneuver such as a pneumatic cylinder for linearly reciprocating the retroreflector; When the reflex reflector is linearly moved inside the outer casing, the reflex reflector can be moved away from the optical path.

According to the above configuration, there is provided an in-situ gas meter which can be calibrated using standard gas without changing the optical path. That is, there is provided an in-situ gas measuring instrument having an automatic calibration device, which can obtain a stable and accurate measurement value by reducing the complexity of the configuration according to the optical path change and the optical path being distorted by reflection.

1 is a schematic configuration diagram of an automatic calibration device for an in-situ gas meter according to an embodiment of the present invention.
2 is a cross-sectional configuration diagram of the automatic calibration device of the automatic calibration device of the in-situ gas meter according to the embodiment of the present invention.
Figure 3 (a) (b) is a configuration diagram of the state of use of the reflection release means of the in-situ gas meter with calibration according to another embodiment of the present invention.
4 is a block diagram of a reflection releasing means according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The in-situ gas measuring instrument to which the present invention is applied basically has a measuring main body 2 fixedly installed on a wall of the duct D through which the exhaust gas passes, and one end of the measuring main body 2 passes through the wall of the duct D. ) And the other end comprises a probe 4 extending to cross the interior of the duct D.

 The measuring device main body 2 includes a light emitting part 6 for emitting light toward the inside of the duct D, and a gas measuring part 8 for measuring the component characteristics of the exhaust gas passing through the duct D through the incident light. )

The probe 4 guides the light emitted from the light emitting part 6 to enter the measuring instrument main body 2 after passing through the inner space of the duct D along the second path W2. The probe 4 provides an exhaust gas passage hole 5 and has a reflector 7 for reflecting light.

The automatic calibration device 10 calibrates the gas measuring unit 8 of the measuring body 2 using the light emitted from the measuring body 2. A feature of the present invention resides in this automatic calibration device 10 and will now be described in detail with respect to the automatic calibration device 10.

The automatic calibration device 10 includes an outer casing 12, a return reflector 14, a reflection release means and a standard gas supply 16.

The outer casing 12 is a cylinder provided between the light emitting part 6 of the measuring instrument main body 2 and the probe 4. One side of the outer casing 12 is provided with a first window 20 through which the light radiated from the light emitting part 6 is introduced, and the light passing through the first window 20 is passed to the probe 4 on the other side. The second window 22 is installed.

The return reflector 14 is installed inside the outer casing 12 so that the light is returned to the gas measuring part along the first path W1 by returning and reflecting the light introduced through the first window 20. However, the present inventor recommends a corner cube prism as the retroreflective body 14. This is because mirrors can be mistaken for mechanical inaccuracies.

In FIG. 2, a reflex reflector 14, which is a corner cube prism, is illustrated, and a pair of mirrors 15 installed at right angles to each other are illustrated in the reflex reflector 14 in FIGS. The mirrors 15 may be gathered to be perpendicular to each other as shown in FIG. 3 (a) while being rotated about each rotation axis 13, or may be opened in parallel as shown in FIG. 3 (b). FIG. 3 (a) shows a state in which light is reflected and is corrected, and FIG. 3 (b) shows a state in which actual exhaust gas is measured as light is passed.

Corner-cube prism is a prism used for reflecting light in a direction not depending on the direction of incidence of light.

According to a feature of the invention the automatic calibration device 10 has a reflection release means. The reflection releasing means is to allow the light introduced through the first window 20 to be directed to the probe 4 through the second window 22. The reflection release means manipulates the retroreflector 14 in such a manner as to rotate, reciprocate or disassemble to cause the retroreflector 14 to diverge from the path of light.

According to the embodiment of the present invention, the reflection releasing means includes a rotating shaft 24 provided in the outer casing 12 so as to be perpendicular to the optical path. The rotating shaft 24 may be rotated by a handle (not shown) installed outside the outer casing 12.

The retroreflective body 14 is fixedly installed on the rotating shaft 24 to enable the rotational movement about the rotating shaft 24. As shown, when the retroreflector 14 rotates counterclockwise at an angle of 90 ° to the center of the axis of rotation 24, the light is in the position shown by the dashed-dotted line. Pass through without passing through the second path (W2). This state corresponds to a state of analyzing the exhaust gas passing through the duct D as an actual use state.

Various anti-reflective means for diverting the retroreflector 14 from the path of light can be conceived in various ways. For example, as shown in FIG. 4, linear movement means for linearly moving the reflex reflector 14 in the outer casing 12 may be introduced.

A description with reference to FIG. 4 is as follows.

The retroreflective body 14 is installed inside the outer casing 12 to enable linear reciprocating motion in the direction perpendicular to the optical path. And the moving part is installed outside the outer casing to linearly reciprocate the retroreflector. The starting unit may be a pneumatic cylinder 25, an electromagnet, an electric motor, or the like. As shown, a pneumatic cylinder 25 is used. It is possible to make the starting portion move away from the optical path by linearly moving the return reflector 14 in the vertical direction in the outer casing 12. Therefore, the light following the first path W1 will follow the second path W2 as shown in FIG. 2.

When calibrating the measuring device, the retroreflective body 14 causes the light to travel along the first path W1, and the standard gas supply unit 26 supplies the standard gas on the path of light. The standard gas supply unit 26 supplies a standard gas into the outer casing 12.

The standard gas supply unit 16 includes an inner casing 28, a gas inlet pipe 30, a gas discharge pipe 32, and gas heating means. The inner casing 28 is a cylinder provided between the first window 20 and the retroreflective body 14, and the third window 34 and the retroreflective body 14 installed in the direction toward the first window 20. It has a fourth window 36 installed in the facing direction. The gas inlet pipe 30 is installed through the outer casing 12 and the inner casing 28. The gas discharge pipe 32 is installed through the inner casing 28 and the outer casing 12. In the actual situation of measuring the exhaust gas, the gas inlet pipe 30 and the gas discharge pipe 32 may be closed by a valve not shown. In this state, the inside of the outer casing 12 and the inner casing 28 are kept in a vacuum or filled with atmosphere.

The standard gas is supplied to the inner casing 28 through the gas inlet pipe 30 and exits to the outside through the gas discharge pipe 32.

According to the present invention, a gas heating means is included to obtain more accurate values by similarly adjusting the measurement environment of the standard gas and the exhaust gas. Gas heating means is installed in the gas inlet pipe 30 is a means for heating the incoming standard gas to a temperature similar to the exhaust gas.

The gas heating means includes a heating case 38 intervening in the gas inlet pipe 30 and a heat transfer heater 40 installed inside the heating case 38. The other end of the heating case 38 is connected to the gas supply pipe 41. In addition, a heat exchange means for providing sufficient heat exchange in the heating case 38 by lengthening the flow path of the introduced standard gas is provided. As shown, the spiral body 42 functions as a heat exchange means. That is, the standard gas is heated while passing through the heating case 38 along the spiral path made by the spiral body 42. According to the present embodiment, the spiral body 38 itself acts as the heat transfer heater 40. Alternatively, the heat transfer heater may be in the shape of a spiral, and when the standard gas passes, the contact surface of the heat transfer heater 40 may be enlarged to increase the efficiency of the heating operation within a short time. In addition, the heat transfer heater and the spiral body may be integrated in various ways, such as by adhering the thin plate-shaped heating wire to the spiral body 38.

Temperature control means for controlling the heat transfer heater 40 to maintain a constant temperature is provided. The temperature control means may include a first temperature sensor 44 for measuring the temperature of the standard gas passing through the heating case 38, and furthermore, a second temperature sensor 46 installed inside the inner casing 28. ) May be included. A thermal pad 48 or a thermal pad may be installed at an outer circumference of the inner casing 28 to maintain the temperature of the standard gas.

According to another embodiment of the present invention, the first, second, third and fourth windows 20, 22, 34 and 36 have an angle A of 80 ° to 87 ° with respect to the optical path passing through the outer casing 12. It can be installed to be inclined. This is a way to eliminate the optical noise returned by the reflection.

Nitrogen, sulfur dioxide, nitrogen dioxide, nitrogen monoxide or ammonia may be used as the standard gas, and the method of analyzing the gas using light is well known and thus the detailed description thereof will be omitted.

The matters described above are only some examples based on the technical idea of the present invention. Those skilled in the art will be able to make various modifications using the examples as illustrated in the range not exceeding the scope of the technical idea of the present invention expressed through the claims.

2: measuring instrument body 4: probe
6 light emitting unit 8 gas measuring unit
10: automatic calibration device 12: outer casing
14: retroreflective body 16: standard gas supply unit
20, 22, 34, 36: 1st, 2nd, 3rd and 4th windows
24: rotating shaft 25: pneumatic cylinder
28: inner casing 30: gas inlet pipe
32: gas discharge pipe 38: heating case
40: heat transfer heater 41: gas supply pipe
42: spiral body 44, 46: first, second temperature sensor
48: thermal pad
D: Duct

Claims (7)

It is fixed to the wall of the duct (D) through which the exhaust gas passes through the light emitting portion 6 for emitting light toward the inside of the duct (D), and discharge through the duct (D) through the incident light A measuring body 2 including a gas measuring part 8 measuring gas; One end penetrates through the wall of the duct D and is connected to the measuring device main body 2, and the other end extends to cross the inside of the duct D, and the light emitted from the light emitting part 6 is An in-situ gas meter including a probe (4) for guiding the inside of the duct (D) and then entering the meter body (2);
For calibrating the gas measuring unit by using light emitted from the measuring unit main body (2);
A cylindrical body interposed between the light emitting unit 6 and the probe 4 of the measuring device main body 2, a first window 20 through which light emitted from the light emitting unit 6 flows is provided and is provided on the other side. An outer casing 12 provided with a second window 22 through which the light passing through the first window 20 passes through the probe 4;
A reflex reflector (14) installed inside the outer casing (12) for retrospectively reflecting light introduced through the first window (20);
A reflection that is diverted from the path of light by manipulating the reflex reflector 14 so that the light introduced through the first window 20 can be directed to the probe 4 through the second window 22. Release means;
Including a standard gas supply unit 16 for supplying a standard gas inside the outer casing 12,
The standard gas supply unit 16;
As a cylinder installed between the first window 20 and the reflex reflector 14, a third window 34 is installed in the direction toward the first window 20, and faces the reflex reflector 14. An inner casing 28 in which the fourth window 36 is installed in a direction;
A gas inlet pipe (30) installed through the outer casing (12) and the inner casing (28);
A gas discharge pipe 32 installed through the inner casing 28 and the outer casing 12;
And a gas heating means for heating the standard gas introduced as installed in the gas inlet pipe (30). delete The method of claim 1,
The gas heating means is a heating case 38, the gas inlet pipe 30 is connected to one end and the gas supply pipe 41 is installed at the other end;
An electrothermal heater 40 installed inside the heating case 38; A spiral body 42 installed inside the heating case 38 to heat the gas introduced into the heating case 38 in a spiral manner;
And a first temperature sensor (44) for measuring the temperature of the standard gas passing through the heating case (38).
The method of claim 1,
The retroreflective body (14) is an automatic calibration device of the in-situ gas meter, characterized in that the corner cube prism.
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