WO2019045200A1

WO2019045200A1 - Laser light control device of laser measurement device

Info

Publication number: WO2019045200A1
Application number: PCT/KR2018/000796
Authority: WO
Inventors: 박호영; 김현희; 임현수
Original assignee: 한국전력공사
Priority date: 2017-08-31
Filing date: 2018-01-17
Publication date: 2019-03-07
Also published as: KR20190025174A; KR101981927B1

Abstract

Disclosed is a laser light control device of a laser measurement device. The laser light control device of a laser measurement device of the present invention comprises: a tube unit; a first alignment unit movably installed inside the tube unit to align a first lens disposed inside the tube unit; and a second alignment unit movably installed inside the tube unit to align a second lens disposed inside the tube unit.

Description

Laser light control device of laser measuring apparatus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser light control apparatus for a laser measurement apparatus, and more particularly, to a laser light control apparatus for a laser measurement apparatus for measuring a concentration of gas in a power plant boiler so that a power plant boiler can maintain an optimal combustion state will be.

The optimum combustion condition setting at the power plant site is based on the operator, reflecting the flue gas concentration, NO emission, and the boiler steam temperature. As the recent diversification of imported coal and the generalization of the hoego are generalized, Reflective combustion tuning and combustion optimization are needed.

In addition to the oxygen concentration of the flue gas, the CO concentration is further measured by using a laser-based non-contact type measurement sensor TDLAS (Tunable Diode Laser Absorption Spectroscopy), and a new control method using the CO concentration value is applied to the existing control method And a combustion control technique for always maintaining an optimum combustion state is provided.

On the other hand, when measuring the temperature / concentration of the pulverized coal / heavy oil flame for power generation using conventional commercialized products, many difficulties are experienced. In particular, as the distance of the laser transmission / reception increases, the response speed and the measurement error rate increase. Therefore, it is necessary to pay more attention to vibration reduction and lens alignment at the installation site.

Therefore, optical alignment is essential for existing laser measurement systems. As a result, the signal focus and intensity of the transmitter and receiver are monitored to manually adjust the lens set in three dimensions.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Registration No. 10-1614851 (2016.04.18) 'Apparatus and Method for Precise Measurement of Optical Temperature Distribution'.

Conventionally, there is a problem that the alignment of the laser is manually checked and aligned by aligning the laser light of the laser measurement device, so that the optical alignment is very troublesome and the signal is missed for a certain period of time in which the vibration occurs, It is necessary to structure.

In addition, when the alignment is deviated due to accumulation of minute thermal deformation due to use for a long period of time, there is a problem that not only the alignment state change between the transmitting and receiving parts but also the alignment between the lenses in the transmitting part is deformed.

In addition, in the case of high dust, there has been a problem in that dust or dust attached to the window or coal fly ash attached to the wall of the boiler furnace or slag must be manually removed.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a laser measuring apparatus capable of controlling vibration reduction and alignment of a lens, A laser light control apparatus of a laser measuring apparatus is provided.

A tube according to one aspect of the present invention; A first aligning part movably installed inside the tube part to align the first lens inside the tube part; And a second alignment unit movably installed inside the tube to align the second lens inside the tube.

The first aligning unit may include a first distance adjusting unit that adjusts a distance between the first lens and the second lens by moving the first lens toward the front and rear of the tube, And a first damping unit for aligning the first lens so that the first lens holds a focus.

The first distance adjuster of the present invention is coupled with the inner surface of the tube portion in the form of a ring by a first thread to move the first lens in forward and backward directions according to the rotation direction.

The first damping unit of the present invention is characterized in that the first damping unit includes a plurality of first spring units, one side of which is provided on the first distance adjusting unit and the other side of which is provided on the first lens to fix the first lens to a focus position .

The first damping unit of the present invention includes a plurality of first magnetic force units that fix the first lens at a focal position using a magnetic force.

The first magnetic portion of the present invention may include a first inner magnetic portion installed in the first lens; And a first outside magnetic force part installed in the first distance adjusting part, wherein the first inside magnetic force part and the first outside magnetic force part are arranged so as to have the same polarity in a direction opposite to each other.

The second aligning unit may include a second distance adjusting unit that adjusts the distance between the second lens and the first lens by moving the second lens toward the front and rear of the tube, And a second damping unit for aligning the second lens so that the second lens is in focus.

The second distance adjuster of the present invention is coupled with the inner surface of the tube portion in the form of a ring by a second screw thread, and is moved forward and backward along the rotation direction.

The second damping unit of the present invention is characterized in that the second damping unit includes a plurality of second spring units, one side of which is provided on the second distance adjusting unit and the other side of which is provided on the second lens, for fixing the second lens to the focus position .

The second damping unit of the present invention includes a plurality of second magnetic force units that fix the second lens at a focus position using a magnetic force.

The second magnetic portion of the present invention may include: a second inner magnetic portion installed in the second lens; And a second outside magnetic force part installed in the second distance adjusting part, wherein the second inside magnetic force part and the second outside magnetic force part are arranged so as to have the same polarity in directions opposite to each other.

The present invention is characterized in that compressed air or nitrogen is injected into a window for transmitting the laser light transmitted through the first lens and the second lens to the inside of the combustion furnace or for transmitting the laser light transmitted from the inside of the combustion furnace to the parabolic mirror And a removing unit for removing the dust on the window, or for removing the slag attached to the inner wall by the burning.

The removing unit of the present invention includes: a compressed air tank for storing compressed air; A first jetting section for jetting the compressed air supplied from the compressed air tank to the window; A second jetting section for jetting the compressed air supplied from the compressed air tank to the slag; And an intermittent control unit for controlling the first jetting unit or the second jetting unit to jet compressed air stored in the compressed air tank to a window or a slag, respectively.

The present invention further includes an angle adjusting unit for adjusting the angle of the parabolic mirror according to the intensity of the laser beam transmitted through the second lens.

The angle adjusting unit may include a detector for receiving laser light condensed by the parabolic mirror; A driving unit for rotating the parabolic mirror; And a parabolic mirror controller for comparing the signal intensity of the detector with a predetermined set value and controlling the driving unit according to the comparison result.

A laser light control apparatus of a laser measuring apparatus according to an aspect of the present invention aligns a lens for controlling a laser light size of a laser measuring apparatus and maintains a light intensity at a high intensity.

The laser light control apparatus of the laser measuring apparatus according to another aspect of the present invention ensures accurate and stable laser light when measuring the temperature and concentration distribution in the boiler, thereby enabling more reliable measurement.

According to another aspect of the present invention, there is provided a laser light control apparatus for controlling a dust and a slag by using air for high-pressure working at a power plant site so as to secure the operation stability and optical signal of the laser system at a relatively low price do.

1 is a conceptual view illustrating a laser light intensity control method of a laser light control apparatus of a laser measuring apparatus according to an embodiment of the present invention.

2 is a configuration diagram of an angle adjusting unit according to an embodiment of the present invention.

FIGS. 3 and 4 are block diagrams of a first alignment unit and a second alignment unit according to an embodiment of the present invention.

FIG. 5 is a block diagram of a removal unit according to an embodiment of the present invention. Referring to FIG.

Hereinafter, a laser light control apparatus of a laser measuring apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. Further, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the user, the intention or custom of the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a conceptual view of a laser light intensity control method of a laser light control apparatus of a laser measuring apparatus according to an embodiment of the present invention. FIG. 2 is a configuration diagram of an angle adjusting unit according to an embodiment of the present invention, FIGS. 3 and 4 are block diagrams of a first aligning unit and a second aligning unit according to an embodiment of the present invention, and FIG. 5 is a block diagram of a removing unit according to an embodiment of the present invention.

1 to 5, a laser light control apparatus of a laser measuring apparatus according to an embodiment of the present invention includes a tube portion 30, an angle adjusting portion 40, a first aligning portion 50, (60) and a removal unit (70).

In the laser light control apparatus of the laser measuring apparatus according to the embodiment of the present invention, the laser light emitted from the laser diode (LD) is combined with the first lens 10 and the second lens 20, Is controlled.

In this embodiment, as the laser measuring apparatus, a tunable laser measuring system used for controlling and optimizing combustion in coal-fired power plants or heavy oil-fired power plants can be employed.

The first lens 10 and the second lens 20 are respectively installed in the tube portion 30 and include a condensing type lens or a dispersion type lens capable of enlarging or reducing the laser light and a lens for guiding parallel progression Can be employed. For example, a convergent lens may be employed as the first lens 10, and a collimation lens may be employed as the second lens 20. [

Here, the size of the laser light is the diameter of the parallel light, and the smaller the size of the laser light, the higher the reception intensity, but the alignment is difficult and the laser light is weak. Therefore, the size of the laser beam needs to be defined in advance according to the test conditions and the like.

For reference, alignment of the first lens 10 and the second lens 20 should be understood to match the centerline of the first lens 10 and the centerline of the second lens 20.

In one embodiment of the present invention, the distance between the first lens 10 and the second lens 20 is adjusted to adjust the size of the laser light. This will be described later.

Furthermore, in the laser light control apparatus of the laser measuring apparatus according to the embodiment of the present invention, the reception ratio of the laser light can be increased in the parabolic mirror (41).

Accordingly, the laser light control apparatus of the laser measuring apparatus according to the embodiment of the present invention includes the angle adjusting unit 40 for adjusting the angle of the parabolic mirror 41 to improve the signal intensity and accuracy.

2, the angle adjusting unit 40 includes a parabolic mirror 41, a detector 42, a driving unit 43, and a parabolic mirror control unit 44.

The parabolic mirror 41 condenses the laser light entering in parallel by the second lens 20 with the detector 42. [

The detector 42 detects the laser beam condensed by the parabolic mirror 41 and outputs a signal corresponding to the laser beam.

The driving unit 43 adjusts the angle of the parabolic mirror 41 in accordance with the control signal of the parabolic mirror control unit 44. Even if the alignment of the first lens 10 and the second lens 20 is not perfectly aligned by adjusting the angle of the parabolic mirror 41 by the driving unit 43 as described above, Make sure you can enter correctly.

The parabolic mirror control unit 44 compares the signal intensity of the signal output from the detector 42 with a predetermined set value and controls the driving unit 43 when the signal intensity is equal to or lower than the set value, So that the signal intensity of the signal is greater than or equal to the set value.

Accordingly, even if the first lens 10 and the second lens 20 are not perfectly aligned when the first lens 10 and the second lens 20 are aligned with each other, the parabolic mirror 41 So that the laser light can enter the detector 42 accurately.

The first alignment unit 50 is provided movably within the tube 30 to align the first lens 10 inside the tube 30 and the second alignment unit 60 aligns the inside of the tube 30 So as to align the second lens 20 inside the tube portion 30. [

In this case, the first alignment unit 50 and the second alignment unit 60 are provided so as to be movable along the tube portion 30 as described above so that the distance between the first lens 10 and the second lens 20 Thereby adjusting the thickness of the laser beam and fixing each of the first lens 10 and the second lens 20 to the focal position.

First, the first alignment unit 50 includes a first distance adjustment unit 51 and a first damping unit 53, as shown in FIG.

The first distance adjuster 51 is formed in a ring shape and its outer surface is in contact with the inner surface of the tube portion 30. The first distance adjusting portion 51 is connected to the first lens 10 through the first damping

portion

53, 10 are moved forward and backward of the tube portion 30 to adjust the distance to the second lens 20.

In this case, a thread is formed on the inner surface of the tube portion 30, and a first thread 52 is formed on the outer surface of the first distance adjusting portion 51. The first distance adjusting portion 51 is threadedly coupled to the tube portion 30 so that the first distance adjusting portion 51 moves forward or backward of the tube portion 30 as the first distance adjusting portion 51 rotates clockwise or counterclockwise do.

Here, the threads formed on the inner surface of the tube portion 30 may be formed in various lengths depending on the range in which the first lens 10 can be moved.

Referring to FIG. 4, the first damping portion 53 includes a first spring portion 54 and a first magnetic force portion 55.

A plurality of first spring portions 54 are provided, one side of which is provided on the first distance adjusting portion 51 and the other side of which is provided on the first lens 10 to fix the first lens 10 to the focal position.

Four first spring portions 54 may be provided, each disposed in a 90 degree orientation. Therefore, even if the tube portion 30 is vibrated by the vibration, the variation due to the vibration can be canceled by the first spring portion 54. [

For example, in the present embodiment, four first spring portions 54 are provided and they are arranged in the direction of 90 degrees. However, the position and number of the first spring portions 54 are specifically limited And may be provided in various positions and in a number as long as the first lens 10 can be accurately positioned at the focus position.

The first magnetic force part 55 fixes the first lens 10 at the focal position by using a magnetic force, and a plurality of them are provided.

The first magnetic force part 55 includes four first inner magnetic force parts 551 provided on the first lens 10 and a first outer magnetic force part 551 provided on the first distance adjustment part 51. The first inner magnetic force part 551 is provided on the first lens 10, And a magnetic portion 552. In this case, the first inside magnetic force part 551 and the first outside magnetic force part 552 are arranged so as to have the same polarity in the directions opposite to each other.

That is, the outer polarity of the first inside magnetic force part 551 and the inside polarity of the first outside magnetic force part 552 are arranged to be equal to each other, .

In this case, as described above, the first magnetic force portions 55 are provided in the direction of 90 degrees, respectively.

Therefore, even if the tube portion 30 is vibrated by the vibration, the variation due to the vibration can be canceled by the magnetic force.

Here, the first inside magnetic force part 551 and the first outside magnetic force part 552 may employ variable magnets, which makes it easier to align the lenses. The same can be applied to the second magnetic force described later.

For reference, in the present embodiment, four first magnetic force portions 55 are provided and they are disposed in the direction of 90 degrees. However, the position and the number of the first magnetic force portions 55 are specifically limited And may be provided in various positions and in a number as long as the first lens 10 can be accurately positioned at the focus position.

The first damping portion 53 includes the first spring portion 54 and the first magnetic force portion 55 to minimize the variation of the position of the first lens 10 and enable rapid damping.

The second alignment part 60 is movably installed in the tube part 30 to align the second lens 20 inside the tube part 30. [ The second alignment unit 60 has the same structure as the first alignment unit 50 in that the second lens 20 is aligned.

The second alignment unit 60 includes a second distance adjustment unit 61 and a second damping unit (not shown). For reference, the second alignment unit 60 is the same as the first alignment unit 50 except that the second lens 20 is aligned, and will be briefly described below.

The second distance adjuster 61 is formed in a ring shape and is in contact with the inner surface of the tube portion 30 and is connected to the second lens 20 through the second damping portion to connect the second lens 20 to the tube portion 30. [ The distance from the first lens 10 is adjusted.

In this case, the second distance adjuster 61 has a second screw thread 62 formed on the outer surface thereof and is threadedly engaged with the tube portion 30. When the second distance adjuster 61 is rotated clockwise or counterclockwise And moves toward the front or rear of the tube portion 30 as it rotates.

The second damping portion includes a second spring portion (not shown) and a second magnetic portion (not shown).

A plurality of second spring portions are provided, one side of which is provided on the second distance adjusting portion 61, and the other side of which is provided on the second lens 20 to fix the second lens 20 to the focal position. Therefore, even if the tube portion 30 is vibrated by the vibration, the variation due to the vibration can be canceled by the second spring portion.

For reference, there are four second spring portions like the first spring portion 54, and they can be arranged in the 90-degree direction, respectively.

And the second magnetic force unit fixes the second lens 20 to the focal position using the magnetic force. The second magnetic force part includes a second inside magnetic force part (not shown) installed in the second lens 20 and a second outside magnetic force part (not shown) installed in the second distance adjusting part 61, The magnetic force portion and the second outside magnetic force portion are disposed so as to have the same polarity in the directions opposite to each other. That is, the outer polarity of the second inside magnetic force portion and the inside polarity of the second outside magnetic force portion are arranged to be equal to each other, so that a repulsive force acts between the second inside magnetic force portion and the second outside magnetic force portion.

Therefore, even if the tube portion 30 is vibrated by the vibration, the variation due to the vibration can be canceled.

For reference, the mounting position and the number of the second magnetic force portions are not particularly limited, and may be provided in various positions and numbers as long as the second lens 20 can be accurately positioned at the focus position.

Thus, the second damping portion minimizes the positional variation of the first lens 10 through the second spring portion and the second magnetic force portion, and enables rapid damping.

That is, the first and

second alignment units

50 and 60 are provided to be movable along the tube unit 30 to move the first lens 10 and the second lens 20, So that it can be adjusted appropriately.

The first alignment unit 50 and the second alignment unit 60 respectively position the first lens 10 and the second lens 20 at a focus position using a magnetic force and an elastic force, The positional change of the first lens 10 and the second lens 20 can be minimized by not being transmitted to the first lens 10 and the second lens 20.

The removing unit 70 removes the dust attached to the window or the fly ash or slag attached to the inner wall of the combustion furnace. The window is provided to prevent dust and the like inside the combustion furnace from being discharged to the outside, and to transfer the laser light transmitted through the first lens 10 and the second lens 20 to the inside of the combustion furnace or to be transmitted from the inside of the combustion furnace And transmits the laser beam to the parabolic mirror 41.

The removing unit 70 includes a compressed air tank 71, a first jetting unit 73, a second jetting unit 72, and an intermittent control unit 74.

The compressed air tank 71 stores compressed air.

The first jetting section 73 includes a first jetting tube 731 and a first valve 732 by jetting the compressed air supplied from the compressed air tank 71 to the window.

The first spray tube 731 guides the compressed air supplied from the compressed air tank 71 to the window surface inside the combustion furnace. The first valve 732 interrupts the compressed air supplied from the compressed air tank 71 to the window through the first injection pipe 731 in accordance with the control signal from the intermittent control unit 74.

The second jetting section 72 includes a second jetting tube 721 and a second valve 722 by injecting the compressed air supplied from the compressed air tank 71 to the slag attached to the inner wall of the furnace do.

The second spray tube 721 guides the compressed air supplied from the compressed air tank 71 to the slag attached to the inner wall of the combustion furnace. The second valve 722 interrupts the compressed air supplied from the compressed air tank 71 to the slag through the second spray pipe 721 in accordance with the control signal of the intermittent control unit 74.

The intermittent control unit 74 controls the first valve 732 or the second valve 722 to pulse the compressed air through the first injection pipe 731 or the second injection pipe 721 to inject the compressed air into the window Remove the slag attached to the inner wall by the attached dust or combustion.

For reference, in the present embodiment, compressed air is used as an example to remove dust and slag, but nitrogen may also be used in addition to air.

As described above, the laser light control apparatus of the laser measuring apparatus according to an embodiment of the present invention aligns the lens for laser light size control of the laser measuring apparatus, reduces vibration, and maintains the light intensity at a high intensity.

Further, the laser light control apparatus of the laser measuring apparatus according to an embodiment of the present invention ensures accurate and stable laser light when measuring the temperature and concentration distribution in the boiler, thereby enabling more reliable measurement.

In addition, the laser light control apparatus of the laser measuring apparatus according to the embodiment of the present invention controls the dust and slag using the high-pressure working air at the power plant site, thereby ensuring the operation stability of the laser system and the accurate optical signal at relatively low cost .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, I will understand. Accordingly, the true scope of the present invention should be determined by the following claims.

Claims

Tube;

A first aligning part movably installed inside the tube part to align the first lens inside the tube part; And

And a second alignment unit movably installed in the tube to align the second lens inside the tube.
The apparatus of claim 1, wherein the first alignment unit

A first distance adjuster for adjusting the distance between the first lens and the second lens by moving the first lens toward the front and rear of the tube; And

And a first damping unit for aligning the first lens so that the first lens maintains a focal point.
3. The apparatus of claim 2, wherein the first distance adjuster

Wherein the first lens is coupled to the inner surface of the tube portion in a ring shape by a first screw thread to move the first lens in the forward and backward directions according to the rotation direction.
3. The apparatus of claim 2, wherein the first damping portion

And a plurality of first spring portions for fixing the first lens to a focus position, one side of which is provided on the first distance adjusting portion and the other side is provided on the first lens. .
3. The apparatus of claim 2, wherein the first damping portion

And a plurality of first magnetic force portions for fixing the first lens at a focus position using a magnetic force.
6. The apparatus of claim 5, wherein the first magnetic portion

A first inner magnetic force part installed on the first lens; And

And a first outer magnetic force part installed in the first distance adjusting part,

Wherein the first inside magnetic force portion and the first outside magnetic force portion are disposed so as to have the same polarity in a direction opposite to each other.
The apparatus of claim 1, wherein the second alignment unit

A second distance adjuster that adjusts the distance between the second lens and the first lens by moving the second lens in the front and rear directions of the tube portion; And

And a second damping unit for aligning the second lens so that the second lens maintains the focal point.
8. The apparatus of claim 7, wherein the second distance adjuster

And a second screw thread coupled to an inner surface of the tube portion in a ring shape to move back and forth along a rotation direction.
8. The apparatus of claim 7, wherein the second damping portion

And a plurality of second spring portions for fixing the second lens to a focus position, one side of which is provided on the second distance adjusting portion and the other side is provided on the second lens. .
8. The apparatus of claim 7, wherein the second damping portion

And a plurality of second magnetic force portions for fixing the second lens at a focus position using a magnetic force.
The apparatus of claim 10, wherein the second magnetic portion

A second inner magnetic force part installed on the second lens; And

And a second outer magnetic force part installed in the second distance adjusting part,

Wherein the second inside magnetic force portion and the second outside magnetic force portion are disposed so as to have the same polarity in a direction opposite to each other.
The method as claimed in claim 1, further comprising the steps of: delivering the laser beam transmitted through the first lens and the second lens to the inside of the combustion furnace; or transferring the laser beam transmitted from the inside of the combustion furnace to the parabolic mirror, Further comprising a removal section for removing dust adhering to the window by spraying nitrogen or for removing slag attached to the inner wall of the combustion furnace.
13. The apparatus of claim 12, wherein the removing unit

A compressed air tank for storing compressed air;

A first jetting section for jetting the compressed air supplied from the compressed air tank to the window;

A second jetting section for jetting the compressed air supplied from the compressed air tank to the slag; And

And an intermittent control unit for controlling the first jetting unit or the second jetting unit to jet compressed air stored in the compressed air tank to a window or a slag, respectively.
The laser light control apparatus of claim 1, further comprising an angle adjuster for adjusting an angle of the parabolic mirror according to a signal intensity of laser light transmitted through the second lens.
15. The apparatus of claim 14, wherein the angle adjuster

A detector for receiving the laser beam condensed by the parabolic mirror;

A driving unit for rotating the parabolic mirror; And

And a parabolic mirror controller for comparing the signal intensity of the detector with a predetermined set value and controlling the driving unit according to the comparison result.