JP2016180642A - Laser analysis device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laser analysis device in which the optical axis deviation occurs uneasily even if the device is provided in a pipe or the like where the vibration or the displacement may occur.SOLUTION: The laser analysis device includes: a first insertion tube and a second insertion tube that are loosely inserted to one end of a pipe or a peripheral wall of a furnace; a light emission unit that irradiates the internal space of the peripheral wall with a laser beam through the first insertion tube; and a light reception unit that receives the laser beam transmitted through the internal space through the second insertion tube. The first insertion tube is supported by a shell supported by a first frame. The second insertion tube is supported by a shell supported by a second frame. The first frame and the second frame are supported by the foundation separate from the peripheral wall. The gap formed in the portion where the insertion tube is loosely inserted through the penetration hole is covered with a shielding mechanism provided with an expandable pipe externally inserted into the insertion tube.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laser analyzer that is connected to a peripheral wall of a pipe or a furnace and performs gas analysis in the pipe or the furnace by irradiating laser light.

An apparatus and a collection method for collecting exhaust gas generated in a converter and collecting noncombustible combustible gas are known. The exhaust gas generated during converter refining is a gas containing carbon monoxide at a high concentration. As an apparatus for treating the converter exhaust gas, conventionally, a non-combustion type exhaust gas treatment apparatus that collects carbon monoxide without burning is used.
As this non-combustion type exhaust gas treatment device, for example, an OG type converter exhaust gas recovery device described in Non-Patent Document 1 is used.

In refining in a converter, hot metal is charged into the converter, and decarburization refining is mainly performed by converter blowing. After the refining is completed, the molten steel is discharged and the slag is discharged, and the molten iron is charged for the next refining. It is during blowing that a large amount of exhaust gas containing a high concentration of carbon monoxide is generated in the converter refining cycle as described above, and no exhaust gas is generated during non-blowing. In addition, the amount of exhaust gas generated increases immediately after the start of blowing, but the exhaust gas immediately after the start of blowing contains a high concentration of oxygen and the carbon monoxide concentration is not high. As time elapses from the start of blowing, the oxygen concentration in the exhaust gas decreases and the carbon monoxide concentration increases.
If the exhaust gas is recovered from the time when the concentration of carbon monoxide in the exhaust gas is not high after the start of blowing, the quality of the recovered exhaust gas as a fuel gas is not preferable. For this reason, normally, as described in Patent Document 1 below, exhaust gas at the start of converter blowing is diffused into the atmosphere, and a CO concentration analyzer in the gas (furnace) is connected to the exhaust gas path of the radiant section at the top of the converter furnace. (Top CO analyzer) is provided, the carbon monoxide concentration in the exhaust gas is measured, and the exhaust gas recovery is started when the carbon monoxide concentration rises above a predetermined concentration.

As described above, the oxygen concentration in the exhaust gas is high immediately after the start of blowing, but the oxygen concentration in the exhaust gas may increase if outside air enters the exhaust gas due to damage in the exhaust gas path. If the exhaust gas is recovered when the oxygen concentration in the exhaust gas is high, the components of the exhaust gas may exceed the explosion limit. For this reason, from the viewpoint of safety, a gas oxygen concentration analyzer (furnace top oxygen analyzer) is provided in the exhaust gas path of the converter furnace top radiation section, and gas oxygen concentration analysis is also performed in the flue after wet dust collection. A meter (an in-furnace oxygen analyzer) is provided, and the exhaust gas is recovered only when the oxygen concentration in the exhaust gas at these two locations is not more than a predetermined value.
For example, after the start of blowing, the carbon monoxide concentration measured by the furnace CO analyzer is, for example, 25% or more, and the oxygen concentration in the exhaust gas at two locations measured by the furnace oxygen analyzer and the furnace oxygen analyzer is constant. The exhaust gas recovery is started only when the condition of less than the concentration, for example, 2% or less is satisfied.

In the above-described oxygen concentration analysis in the converter exhaust gas, a method of sampling and analyzing the gas in the flue (exhaust gas path) is generally used. For example, a magnetic oxygen analyzer using a wet sampler is used. The gas can be sampled from the flue using a water flow, and the oxygen concentration in the sample gas can be measured by introducing the sampling gas into the magnetic oxygen analyzer via the drain separator, the gas cooler, and the drain separator.
In such a conventional analysis method, since there is a delay in the analysis response of the furnace oxygen analyzer, there is a problem that the timing of starting the recovery of exhaust gas after the start of converter blowing is delayed, and the converter exhaust gas that is a combustible gas There was a problem that could not be used effectively.

  Further, for example, Patent Documents 2 and 3 below disclose laser gas analyzers that collect and irradiate laser light into a measurement gas as a gas analyzer and measure the gas concentration based on a change in the amount of the laser light.

JP-A-5-209212 JP 2002-277391 A JP 2007-170841 A International Publication No. 2013/179432

Edited by the Japan Iron and Steel Institute, “Third Edition Steel Manual II

  Until now, there has been no example of applying the laser gas analyzer as described above to the converter gas recovery device, so the inventors of the present application applied the laser gas analyzer as disclosed in Patent Document 4, and the exhaust gas path. The analysis response delay of the oxygen analysis in gas was reduced, and the recovery amount of converter exhaust gas was increased.

  FIG. 7A shows a first example of the laser type gas analyzer described in Patent Document 4, and the laser irradiation unit 101 and the laser light receiving unit 102 provided in the pipe 100 constituting the flue and the arithmetic processing. A gas analyzer 105 is configured including the apparatus 103. In the configuration of this figure, the laser irradiation unit 101 is connected to the outside of the introduction tube 106 penetrating one side of the peripheral wall of the pipe 100, and the laser light receiving unit 102 is connected to the outside of the detection tube 107 penetrating the other side of the peripheral wall. The leading end of the introduction tube 106 and the leading end of the detection tube 107 are arranged to face each other.

  FIG. 7B shows a second example of the laser gas analyzer described in Patent Document 4, which includes a laser irradiation unit 101, a laser light receiving unit 102, and an arithmetic processing unit 103 provided in the pipe 100. The point where the gas analyzer 105 is configured is an equivalent structure. In the configuration of this figure, the introduction pipe 108 penetrating one side of the peripheral wall of the pipe 100 is formed longer than the introduction pipe 106 of the previous example, and the detection pipe 109 penetrating the other side of the pipe 10 is the detection of the previous example. It is formed longer than the tube 107. A purge gas supply device 110 is connected to a part of the introduction pipe 108 and a part of the detection pipe 109, and the oxygen concentration in the gas is measured while supplying the purge gas into the pipe 100 from the front end of the introduction pipe 108 and the front end of the detection pipe 109. Can be done.

  By providing the laser gas analyzer 105 configured as shown in FIGS. 7A and 7B, it is possible to measure the oxygen concentration in the exhaust gas flowing through the pipe 100 constituting the flue without causing a delay in the analysis response. It has become possible. Further, when the inner diameter of the pipe 100 is increased, laser light is scattered or reflected due to the presence of foreign matters such as dust and water droplets contained in the exhaust gas. These effects can be suppressed by the configuration using the long introduction tube 108 and the detection tube 109 extending to the end.

However, in the pipe 100 connected to the converter, slight vibration or deformation occurs depending on the operation of the converter, the operation of peripheral equipment, or the presence or absence of gas passing through the inside. When long-term microvibration acts on the introduction pipes 106 and 108 and the detection pipes 107 and 109 provided so as to penetrate the pipe 100 and the influence of deformation of the pipe 100 is applied, the laser irradiation unit 101 and the laser The facing position of the light receiving unit 102 may be displaced, and there has been a problem that the measurement error increases due to a decrease in the light amount due to the optical axis shift of the laser light, or the measurement becomes impossible in some cases.
For this reason, it is necessary to periodically maintain the laser gas analyzer, and it is necessary to correct the optical axis misalignment between the laser irradiation unit 101 and the laser light receiving unit 102 at every maintenance.

  The present invention has been made in view of the above-described conventional problems, and has a configuration in which an optical axis shift or a positional shift of a laser beam hardly occurs even when a peripheral wall of a pipe or a furnace is vibrated or deformed. An object of the present invention is to provide a laser analyzer capable of preventing a decrease in measurement accuracy due to an optical axis deviation or a positional deviation and improving workability during maintenance by suppressing the optical axis deviation or the positional deviation.

The present invention has the following configuration as means for solving the above problems.
(1) The laser analyzer of the present invention includes a first insertion tube provided by loosely inserting an insertion hole formed on one side of a peripheral wall of a pipe or a furnace, and an insertion formed on the other side of the peripheral wall. A hole is inserted loosely, and a second insertion tube is provided so as to face the first insertion tube, and laser light is irradiated to the inner space of the peripheral wall via the first insertion tube And a light receiving portion that receives the laser light that has passed through the inner space via the second insertion tube, and the first insertion tube is supported by the first frame. The second insertion tube is connected to a tube supported by a second frame, and the first frame and the second frame are supported by a foundation separately from the peripheral wall. Together, characterized in that gap which the insertion tube is formed in a portion that loosely inserted to the insertion hole is covered with telescopic tube extrapolated to the insertion tube.

Since the first and second insertion tubes loosely inserted through the insertion holes of the peripheral wall are connected to the tube body supported by the foundation separately from the peripheral wall, the first and second insertion tubes are vibrations of the peripheral wall. Not affected by or deformation. For this reason, even if it is used for a long time, the positional displacement and the angular displacement of the insertion tube do not occur, and the positional displacement and the angular displacement between the light emitting unit and the light receiving unit connected to the insertion tube do not occur. Therefore, it is possible to provide a laser analyzer that can perform gas analysis without causing a positional deviation or an angular deviation of the optical axis of the laser light, hardly causes a measurement error, and does not fall into an incapable measurement state. Further, since it is difficult to cause an optical axis shift or a positional shift, it is not necessary to correct the optical axis shift or the positional shift between the light receiving unit and the light emitting unit, and the workability during maintenance is improved.
In addition, the gap where the insertion tube is loosely inserted through the insertion hole of the peripheral wall is covered by a shielding mechanism with an expansion tube, so the gap can be blocked from the outside and exists in the inner space of piping, furnaces, etc. There is no gas going out.

(2) In the present invention, a tube body in which an outer peripheral portion of the first insertion tube and the light emitting portion, which are placed outside the peripheral wall, are supported by the first frame installed outside the peripheral wall. A configuration in which the outer peripheral portion of the second insertion tube and the light receiving portion, which are connected to the outside of the peripheral wall and connected to the tubular body supported by the second frame installed on the outer side of the peripheral wall, are connected. Can be adopted.
The outer periphery of the insertion tube located outside the peripheral wall and the light emitting part or the light receiving part are supported by tubes supported by the respective bases, and by supporting each base on the basis, the insertion tube is separated from the peripheral wall. The light emitting unit and the light receiving unit can be stably supported. For this reason, even if vibrations or positional deviations occur in the piping or the peripheral wall of the furnace, positional deviations between the insertion tube, the light emitting part, and the light receiving part hardly occur, and angular deviations hardly occur. For this reason, it is possible to provide a laser analyzer that hardly causes measurement errors and does not fall into an unmeasurable state.

(3) In the present invention, one end side of the expansion tube externally inserted into the insertion tube is connected to the opening peripheral edge of the insertion hole, and the other end side of the expansion tube is closed to isolate the gap from the outside. And the structure by which the other end of the said expansion-contraction tube was supported by the said mount frame is employable.
By connecting to the opening periphery of the insertion hole on one end side of the expansion tube and closing the other end side of the expansion tube, the clearance of the insertion hole loose insertion portion of the insertion tube can be isolated from the outside. For this reason, the exhaust gas flowing through the telescopic tube does not go outside through the gap. In addition, the vibration and displacement of the peripheral wall are transmitted to the telescopic tube, but the other end of the telescopic tube is supported by the mount and separated from the insertion tube. I don't get it.

(4) In this invention, the structure by which the one end side of the said expansion-contraction tube was connected to the opening peripheral part of the said insertion hole via the extension pipe | tube is employable.
(5) In the present invention, an outer opening of the telescopic tube is connected to one end side of the tubular body, and the insertion tube is inserted into the tubular body and integrated with an outer end of the insertion tube. It is possible to adopt a configuration in which the sealed plate is provided so as to cover the outer opening of the tubular body.
By covering the outer opening of the tubular body connected to the telescopic tube with the sealing plate, the outer end of the tubular body can be closed with the sealing plate. Thereby, the space part formed by being covered with the expansion and contraction tube and the tubular body outside the insertion tube can be closed with the sealing plate, and the gap in the insertion hole loose insertion portion of the insertion tube can be isolated from the outside.
(6) In this invention, the structure by which the gas supply means which supplies purge gas to the loose insertion part of the said insertion tube with respect to the said insertion hole was connected is employable.
By supplying the purge gas to the insertion portion of the insertion tube, it is possible to block the gas that is about to go outside through the insertion portion, and it is possible to prevent leakage of gas from the inside of the pipe or the furnace.

The present invention includes a first insertion tube that loosely inserts an insertion hole formed in a peripheral wall, and a second insert that loosely inserts another insertion hole formed in the peripheral wall and faces the first insertion tube. Since the insertion tube is supported by the foundation separately from the peripheral wall, the insertion tube is not easily affected by vibration or deformation of the peripheral wall, and the insertion tube connected to the light emitting part and the light receiving part is less likely to be displaced or angularly displaced. . For this reason, even if it is used for a long time, there is no angle shift or position shift in the positional relationship between laser light irradiation and light reception, and a decrease in the amount of light due to the optical axis shift can be suppressed, and excellent analysis accuracy can be maintained for a long time. There is an effect that a laser analyzer can be provided.
In addition, since the optical axis and position are unlikely to be misaligned in the positional relationship between the laser light emitting part and the light receiving part, there is no need for correction work during maintenance even if it is used for a long period of time, thus improving workability during maintenance. is there.

Schematic which shows an example of the converter exhaust gas collection | recovery apparatus with which the laser analyzer of 1st Embodiment which concerns on this invention is applied. The side view which shows the laser analyzer of 1st Embodiment installed in the converter exhaust gas collection | recovery apparatus. FIG. 2 shows a partial configuration of the laser analyzer, in which (A) is a side view of the first gantry along the arrow EE ′ in FIG. 2, and (B) is the second gantry along the arrow FF ′ in FIG. A side view and (C) are side views which show the 1st insertion tube support part which followed the arrow GG 'of FIG. Sectional drawing which shows the principal part of the same laser analyzer. FIGS. 5A and 5B show a partial configuration of the laser analyzer, in which FIG. 5A is a side view of a flange plate along an arrow LL ′ in FIG. 4, and FIG. FIGS. 5A and 5B show a partial configuration of the laser analyzer, in which FIG. 5A is a side view of a sealing plate along an arrow MM ′ in FIG. 4, and FIG. 5B is a side view of a lid plate along an arrow NN ′ in FIG. The conventional laser analyzer is shown, (A) is sectional drawing which shows a 1st example, (B) is sectional drawing which shows a 2nd example.

Hereinafter, the details of the present invention will be described with reference to an example in which the laser analyzer according to the first embodiment is applied to a converter exhaust gas recovery device.
FIG. 1 shows the overall configuration of an OG-type converter exhaust gas recovery apparatus that employs the laser analyzer of this embodiment.
A hood 2 is connected to the furnace top portion of the converter 1, and a two-stage venturi scrubber (dust collector) 4 is connected to the hood 2 via a radiating section 3, and is attracted to the subsequent stage of the second-stage venturi scrubber 4. A pipe 11 for constituting a flue is connected via the blower 5. A branch path 11A and a branch path 11B are formed in order in the middle of the pipe 11, and a diffusion tower 8 is connected to the branch path 11B. The branch path 11A is connected to an intermediate portion of the branch path 11B. A first three-way valve 6A is provided at a portion branched from the pipe 11 in the branch passage 11B, and a second three-way valve 6B is provided slightly downstream from the branch portion of the branch passage 11B in the pipe 11, and the branch passage 11A A third three-way valve 7 is provided inside.
A recovery valve 9 is provided on the downstream end side of the pipe 11, and a gas holder 10 is connected to the downstream side via a connection pipe 12.

The three-way valve 6B closes the flow path of the pipe 11, the three-way valve 7 closes the branch path 11A, the three-way valve 6A is opened, and the flow path of the branch path 11B is opened. 8 is released into the atmosphere via The flow path of the pipe 11 is opened by the three-way valve 6B, and the flow path of the branch path 11B is closed by the three-way valve 6A, whereby the exhaust gas in the pipe 11 reaches the gas holder 10 via the recovery valve 9 and the connection pipe 12.
By operating the three-way valves 6 </ b> A and 6 </ b> B as described above, it is possible to select whether the exhaust gas discharged from the converter 1 is guided to the gas holder 10 or diffused into the atmosphere from the stripping tower 8.
As described above, the exhaust gas from the converter 1 flows from the converter 1 on the upstream side toward the diffusion tower 8 or the gas holder 10 on the downstream side. Hereinafter, a path through which the exhaust gas flows from the converter 1 to the stripping tower 8 or the gas holder 10 is collectively referred to as an exhaust gas path.

  On the furnace top side of the converter 1, a first gas oxygen concentration analyzer (hereinafter referred to as “top furnace oxygen analysis”) is connected to the radiation section 3, which is an exhaust gas path upstream from the position where the first stage venturi scrubber 4 is provided. 21) and a gas CO concentration analyzer (hereinafter referred to as furnace top CO analyzer) 22 are incorporated. In addition, a second gas oxygen concentration analyzer (hereinafter referred to as an in-furnace oxygen analyzer) 23 is incorporated in a pipe 11 that is an exhaust gas path downstream of the second-stage venturi scrubber 4. This in-furnace oxygen analyzer 23 is incorporated in the pipe 11 on the downstream side of the induction fan 5.

Whether the converter exhaust gas is collected in the gas holder 10 or diffused into the atmosphere via the diffusion tower 8 is determined based on the gas analysis result of the exhaust gas. For example, the carbon monoxide concentration in the exhaust gas analyzed by the furnace top CO analyzer 22 is 25% or more, and the oxygen concentrations in the exhaust gas analyzed by the furnace top oxygen analyzer 21 and the furnace oxygen analyzer 23 are both 2. % Is less than or equal to%, and the exhaust gas is recovered in the gas holder 10 when the recovery condition is satisfied.
When even one of the conditions is not met, the recovery condition is not established, and the exhaust gas is diffused from the radiation tower 8 into the atmosphere. In addition, the said collection conditions are an example and can be suitably changed for every installation.

As described above, since the oxygen concentration in the converter exhaust gas is high and the carbon monoxide concentration is low at the start of converter blowing, the converter exhaust gas is diffused from the diffusion tower 8.
With the progress of blowing, the oxygen concentration in the gas analyzed by the furnace top oxygen analyzer 21 and the furnace oxygen analyzer 23 decreases, and the carbon monoxide concentration in the exhaust gas analyzed by the furnace CO analyzer 22 increases. . When the analyzed gas component reaches the recovery condition, the three-way valves 6A and 6B are operated to the recovery side, the recovery valve 9 is opened, and exhaust gas recovery to the gas holder 10 is started.

In this embodiment, the in-furnace oxygen analyzer 23 is a method of irradiating the exhaust gas in the pipe 11 with laser light and measuring the gas concentration from the change in the amount of light due to the light absorption of the laser light. A laser analyzer is provided.
In detail, the laser analyzer 23 of the present embodiment is formed on one side in the diameter direction of the peripheral wall 11a when the middle part of the horizontally arranged pipe 11 constituting the flue is viewed in cross section as shown in FIG. The inserted insertion hole 11b is loosely inserted with a slight gap d, and includes a first insertion tube 25 installed horizontally, and a light emitting unit 26 connected to the outer end of the first insertion tube 25. ing. Further, the insertion hole 11c formed on the other side in the diameter direction of the peripheral wall 11a in FIG. 2 is loosely inserted and connected to the second insertion tube 27 installed horizontally and the outer end portion of the second insertion tube 27. The light receiving unit 28 and an arithmetic processing unit 29 connected to the light receiving unit 28 are provided.

The light emitting unit 26 has a function of irradiating the measurement laser light 30 toward the space to be measured, and the light receiving unit 28 has a function of detecting the measurement laser light 30 that has passed through the space to be measured. The laser beam 30 emitted from the light emitting unit 28 is irradiated with the measurement space while continuously changing the wavelength, and the output signal from the light receiving unit 28 obtained as a result is analyzed and calculated by the arithmetic processing unit 29 to be detected. Data on average concentration and temperature of molecules and atoms can be obtained.
In the present embodiment, since the exhaust gas from the converter 1 passes through the inner space S of the pipe 11, the measurement laser light 30 is emitted from the distal end portion 25 a of the first insertion tube 25 to the inner space S and then second. Until it enters the distal end portion 27 a of the insertion tube 27, it is affected by the exhaust gas, and then reaches the light receiving portion 28.

  The first insertion tube 25 is composed of a tube slightly longer than the radius of the pipe 11, and its distal end 25 a is desired near the center of the pipe 11, and its base end 25 b protrudes outside the pipe 11. It is installed horizontally. The first insertion tube 25 is connected at its base end portion 25 b to a tube body 24 supported by a steel frame structure base 33 supported by a foundation G separate from the pipe 11.

At the upper end of the gantry 33, a portal frame 33A is erected on the tube body 24 side through a rectangular frame member 33a, and support pieces 33B and 33B spaced apart from each other are provided at the center of the top of the portal frame 33A. The tube body 24 is supported so as to be sandwiched between the support pieces 33B and 33B. The pair of support pieces 33B and 33B are respectively formed at a position close to the pipe 11 and a position far from the pipe 11 on the upper surface side of the portal frame 33A, and the tube body 24 is positioned by a total of four support pieces 33B.
Accordingly, the tube body 24 is installed at the center of the top of the portal frame 33A, is fixed in a state sandwiched between the four support pieces 33B, and is supported horizontally, and the first insertion tube 25 is the tube body. 24 and cantilevered horizontally.
One end side of the first insertion tube 25 extends through the tube body 24 through the tube body 24, and passes through the flange plate 44 </ b> A integrated with the outer end of the tube body 24. It is joined to a sealing plate 44B adjacent to 44A. This junction structure will be described in detail later.

On the outer side of the portion where the first insertion tube 25 loosely inserts the insertion hole 11b of the pipe 11, a cover plate 35 is provided that is in close contact with the outer surface of the peripheral wall 11a and covers the opening peripheral edge of the insertion hole 11b. As shown in FIG. 6B, the cover plate 35 has a square shape when viewed from the front, and the first insertion tube 25 is loosely inserted into the through hole 35a formed in the center thereof with a slight gap. Yes.
A short extension tube 36 having an inner diameter slightly larger than the outer diameter of the first insertion tube 25 is provided outside the cover plate 35, and the extension tube 36 is extrapolated to the first insertion tube 25. . One end side of the extension pipe 36 passes through the through hole 35a of the lid plate 35 and is connected to the opening peripheral edge of the insertion hole 11b. A ring plate-like connection plate 37 is attached to the other end side of the extension pipe 36. . 4 shows an enlarged structure of the insertion portion of the first insertion tube 25. FIG. 4 shows the first insertion tube 25 from a direction opposite to the direction of viewing the first insertion tube 25 shown in FIG. And the surrounding area.

  An expansion / contraction tube 38 made of a metal bellows tube is connected to the outside of the connection plate 37. Ring plate-like flange plates 39 and 40 are connected to both ends of the expansion tube 38, and the expansion tube 38 abuts one flange plate 39 against the connection plate 37 on the extension tube 36 side to insert the first insertion tube 25. Has been extrapolated to. The connecting plate 37 and the flange plate 39 which are overlapped with each other are joined together by a plurality of coupling bolts (not shown) which penetrate and integrate both. As an example of the telescopic tube 38, a stainless steel bellows tube can be exemplified.

The extension tube 36, the connection plate 37, the flange plate 39, the telescopic tube 38, and the flange plates 40 and 41 are all inserted with a slight gap with respect to the first insertion tube 25. For this reason, on the outer peripheral side of the first insertion tube 25, from the opening peripheral part of the insertion hole 11b, the inner peripheral part of the extension pipe 36, the inner peripheral part of the connecting plate 37, the inner peripheral part of the telescopic pipe 38, and the tubular body The space part K which reaches the inner peripheral part of 24, the inner peripheral part of 44 A of flange plates, and the sealing board 44B is formed. The space K is communicated with the inner space of the pipe 11 through the insertion hole 11c on the pipe 11 side, but is sealed with the first insertion tube 25 on the side away from the pipe 11. It is closed by a stop plate 44B.
In the above configuration, the opening of the insertion hole 11b is formed by the lid plate 35, the extension tube 36, the connection plate 37, the flange plate 39, the telescopic tube 38, the flange plates 40 and 41, the tube body 24, the flange plate 44A, and the sealing plate 44B. A shielding mechanism H for isolating the gap d of the part from the outside is configured.

  In addition, since it is preferable to flow purge gas through the space K, as an example, a supply pipe 34a connected to the purge gas supply device 34 is connected to a part of the outer peripheral wall of the extension pipe 36, and nitrogen gas or the like is connected. The purge gas is supplied to the space K.

A support base 33C extending from the upper side of the first mount 33 is formed below the flange plates 40 and 41 and the sealing plate 44B. As shown in FIG. 6A, the flange plate 40 and the flange plate 41 are formed. Is mounted on the support base 33C, and the flange plate 40 and the flange plate 41 are fixed by the cable body 42 connected to the support base 33C.
An observation laser beam repeater 43 is connected to the base end side of the first insertion tube 25 via a plurality of flange plates 44A, sealing plates 44B, and flange plates 44C. A light emitting unit (light emitting unit) 26 for observation laser light is connected to the outside of the repeater 43.
Also, the peripheral wall 11a has a saddle type shape so as to cover the first insertion tube 25, the base end portion thereof, the repeater 43, and the light emitting portion 26 above the portion where the first insertion tube 25 protrudes outward. The cover unit 46 is installed.

  Up to this point, the structure of the first insertion tube 25 and the light emitting section 26 and their peripheral devices provided on one side of the peripheral wall 11a shown in FIG. 2 has been described. Tube 27, light receiving unit 28, and peripheral devices thereof. The second insertion tube 27, its supporting structure and its peripheral structure are the same except that the first insertion tube 25, its supporting structure and its peripheral structure are different in direction. Therefore, although only the directions are different, the same components are denoted by the same reference numerals, and the description thereof is simplified.

The second insertion tube 27 is configured to have a length equivalent to that of the first insertion tube 25, the distal end portion 27 a is desired near the center of the pipe 11, and the base end portion 27 b is disposed outside the pipe 11. It is installed horizontally with protruding. The second insertion tube 27 is horizontally disposed by loosely inserting the peripheral wall 11a so as to face the first insertion tube 25.
The second insertion tube 27 is connected at its base end portion 27 b to a tube body 24 supported by a steel frame structure base 33 supported on a foundation G separate from the pipe 11. The gantry 33 is equivalent in structure to the gantry 33 in the previous example, and only the installation position and the installation direction are different. That is, a portal frame 33A and support pieces 33B and 33B are provided, and the tube body 24 is supported by these.

The structure in which the second insertion tube 27 is loosely inserted in the insertion hole 11c of the peripheral wall 11 is also the same as the structure of the first insertion tube 25, and the cover plate 35, the extension tube 36, the connection plate 37, and the expansion / contraction The point where the tube 38, the flange plates 39, 40, 41, the flange plate 44A, the sealing plate 44B, and the flange plate 44C are provided is the same as the peripheral structure of the first insertion tube 25.
The second insertion tube 27 is different in that the light receiving unit 28 is connected to the base end side of the second insertion tube 27 via the repeater 43 and the arithmetic processing unit 29 is connected to the light receiving unit 28. However, other structures are equivalent to the peripheral structure of the first insertion tube 25 described above.
In the above configuration, the second insertion tube 27 is provided with a cover plate 35, an extension tube 36, a connection plate 37, a flange plate 39, a telescopic tube 38, flange plates 40, 41, 44A, and a sealing plate 44B. Therefore, the shielding mechanism H for isolating the clearance gap of the opening part of the penetration hole 11b from the exterior is comprised by these.

According to the structure described above, the first insertion tube 25 is cantilevered by the pipe body 24 supported by the gantry 33 provided on the foundation G separately from the pipe 11, The second insertion tube 27 is cantilevered by the tube body 24 supported by the gantry 33. Therefore, the gantry 33 that supports the tube body 24 that supports the first insertion tube 25 is referred to as a first gantry, and the gantry 33 that supports the tube body 24 that supports the second insertion tube 27 is the first gantry. It can be referred to as a 2 frame.
Since the first insertion tube 25 is loosely inserted into the insertion hole 11b and the second insertion tube 27 is loosely inserted into the insertion hole 11c, the piping 11 The insertion tubes 25 and 27 do not interfere with each other, and the insertion tubes 25 and 27 are not affected by the piping 11 and do not cause a positional shift or an angular shift. Since the first insertion tube 25 and the second insertion tube 27 are supported by the first frame 33 and the second frame 33 supported by the separate foundation G, the pipe 11 vibrates. However, even if the position is shifted, there is no position shift or angle shift of the insertion tubes 25 and 27.
Further, the insertion tubes 25 and 27 are not displaced or angularly displaced even after long-term use. Since the positional displacement and the angular displacement of the insertion tubes 25 and 27 do not occur, neither the relative positional displacement nor the relative angular displacement between the light emitting unit 26 and the light receiving unit 28 occurs.

Therefore, it is possible to provide a laser analyzer 23 that can perform gas analysis for a long period of time without causing a positional deviation or an angular deviation of the optical axis of the laser light, hardly causes a measurement error, and does not fall into an unmeasurable state. In addition, since the optical axis deviation and the positional deviation hardly occur even when used for a long period of time, the correction work for the optical axis deviation and the positional deviation becomes unnecessary, and the workability at the time of maintenance is improved.
In a general commercially available laser analyzer, the above-described structure is extremely effective because the measured value may change or become impossible to measure even when the optical axis is shifted by about 3 degrees.

Next, when the insertion tube 25 is loosely inserted into the insertion hole 11b and the insertion tube 27 is loosely inserted into the insertion hole 11c, a gap d is formed between the insertion holes 11b and 11c and the insertion tubes 25 and 27. Produce. The exhaust gas flowing in the pipe 11 may be discharged to the outside of the pipe 11 through these gaps d. The outside of the gaps d communicates with the space K, and the space K is closed by the sealing plate 41. Therefore, the exhaust gas does not leak outside the pipe 11.
Further, when the purge gas supply pipe 34a is connected to the outer peripheral wall of the extension pipe 36, the purge gas can be filled in the space K, and the purge gas flows from the space K side to the inside of the pipe 11 through the insertion holes 11b and 11c. If it does so, it can block with purge gas so that the exhaust gas which exists in the inner space of the piping 11 may not flow into the space part K side, and can prevent external leakage of exhaust gas reliably.

In the above-described structure, since the expansion tube 38 is provided outside each of the insertion tubes 25, 27, the insertion tubes 25, 27 are stably supported by the gantry 33, 33 supported by the foundation G. Even if vibration or displacement occurs in the pipe 11, the telescopic tube 38 absorbs the vibration or displacement and does not affect the insertion tubes 25 and 27 due to vibration or displacement. That is, when vibration or displacement occurs in the pipe 11, these are transmitted to the expansion tube 38, but the expansion tube 38 is deformed to absorb these vibrations and displacement, and the insertion tubes 25 and 27 are subjected to vibration and displacement. Does not affect the position shift.
Since the flange plates 40 and 41 and the sealing plate 44B connected to the outer end portion of the telescopic tube 38 are supported by the gantry 33 via the support base 33C, the outer end portion of the telescopic tube 38 is also stably supported.

  By the way, in the previous embodiment, the insertion tubes 25 and 27 attached to the pipe 11 are long tubes extending to the vicinity of the central portion of the pipe 11, but the structure of the present embodiment includes the insertion tubes 25 and 27. It can also be applied to the case of a short insertion tube shown in FIG. As shown in FIG. 7A, the present invention can be applied even to a short insertion tube that penetrates the peripheral wall of the pipe 100 and slightly protrudes to the inside of the pipe 100. The insertion tube that protrudes in the direction shown in FIG. 7A is formed to be slightly longer than the structure shown in FIG. 7A, and is supported by a tube body 24 supported on a foundation separate from the pipe 100, and can be applied to a structure that supports the insertion tube.

In the previous embodiment, the structure in which the insertion tubes 25 and 27 are attached to the pipe 11 has been described. Instead of applying the present invention to the pipe 11, a combustion furnace, an annealing furnace, a tempering furnace for cold rolling, and the like. The insertion tube 25 is loosely inserted on one side and the insertion tube 27 is loosely inserted on the other side of the peripheral wall of the furnace or the piping for extracting the atmospheric gas from these furnaces. Inventive structure can be applied.
Even in a combustion furnace or a tempering furnace, the furnace may be controlled depending on the amount of oxygen, carbon monoxide, etc. contained in the atmosphere in the furnace, so the structure of the present invention is applied and laser light is used. The gas concentration and temperature in the furnace atmosphere can be measured.

  H ... shielding mechanism, G ... foundation, K ... space part, 1 ... converter, 2 ... hood, 3 ... radiation part, 4 ... venturi scrubber, 6A, 6B ... three-way valve, 8 ... diffusion tower, 10 ... gas holder, DESCRIPTION OF SYMBOLS 11 ... Piping, 23 ... Furnace oxygen analyzer (laser analyzer), 25 ... 1st insertion tube, 25a ... Tip part, 25b ... Base end part, 26 ... Light emission part, 27 ... 2nd insertion tube 27a ... distal end portion, 27b ... proximal end portion, 28 ... light receiving portion, 29 ... arithmetic processing device, 30 ... laser beam for measurement, 33 ... mount, 36 ... extension tube, 38 ... telescopic tube, 39, 40, 41, 44A, 44C ... flange plate, 44B ... sealing plate.

Claims (6)

A first insertion tube provided by loosely inserting an insertion hole formed on one side of the peripheral wall of the pipe or the furnace, and an insertion hole formed on the other side of the peripheral wall; A second insertion tube provided to face the insertion tube, a light emitting unit for irradiating the inner space of the peripheral wall with laser light through the first insertion tube, and the inner space passed A light receiving portion for receiving the laser light through the second insertion tube,
The first insertion tube is supported by a tube supported by a first gantry, the second insertion tube is supported by a tube supported by a second gantry, and the first gantry and The second frame is supported by a foundation separately from the peripheral wall,
A laser analyzing apparatus, wherein a gap formed in a portion where the insertion tube is loosely inserted into the insertion hole is covered with a telescopic tube externally inserted into the insertion tube.   The outer peripheral part of the first insertion tube and the light emitting part that are placed outside the peripheral wall are supported by a tubular body supported by the first frame installed on the outer side of the peripheral wall, and the outer side of the peripheral wall 2. The outer peripheral portion of the second insertion tube and the light receiving portion that are placed on the tube are supported by a tubular body that is supported by the second frame installed outside the peripheral wall. The laser analyzer described in 1.   One end side of the expansion tube externally inserted into the insertion tube is connected to the peripheral edge of the opening of the insertion hole, and the other end side of the expansion tube is closed to isolate the gap from the outside. The laser analyzer according to claim 1, wherein an end is supported by the mount.   The laser analyzer according to claim 3, wherein one end side of the telescopic tube is connected to an opening peripheral edge of the insertion hole via an extension tube.   An outer opening of the telescopic tube is connected to one end of the tube, the insertion tube is inserted through the tube, and a sealing plate integrated with the outer end of the insertion tube is the tube. The laser analyzer according to claim 3 or 4, wherein the laser analyzer is provided so as to cover an outer opening of the body.   The laser analyzer according to any one of claims 1 to 5, wherein a gas supply means for supplying a purge gas is connected to a loose insertion portion of the insertion tube with respect to the insertion hole.

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