JP2006125848A - Laser type analyzer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laser type analyzer for removing dust adhering to the inner wall surface of an attached pipe with a small amount of gas. <P>SOLUTION: Supersonic nozzle injection gas following shock waves having straight-advance properties is injected from a nozzle 11 having a fluid guide section 22 with a laval nozzle section 21 and a suction hole 23 into the attached pipe 3, thus removing dust adhering to the inside of the attached pipe 3 efficiently. A necessary and sufficient amount of purge gas is purged by condenser lenses 4', 5', thus preventing the surface of the condenser lenses 4', 5' from being contaminated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a laser analyzer for analyzing high-temperature exhaust gas generated in a waste incinerator or an ash melting furnace.

  Conventionally, in a refuse incinerator and an ash melting furnace, a laser analyzer is used to perform combustion control corresponding to the properties of high-temperature exhaust gas in real time. As shown in FIG. 6, the laser analyzer 100 includes mounting tubes 102 and 102 whose tips are fixed to wall surfaces 101 ′ and 101 ′ of a flue (or furnace) 101 facing each other, A transmitter 103 that condenses and transmits laser light by a condensing lens 103 ′ provided at the front thereof is fixed to a base end portion of one attachment tube 102, and a base end of the other attachment tube 101 is fixed. A receiver 104 for receiving the laser beam transmitted from the transmitter 103 via a condenser lens 104 ′ provided at the front is fixed to the unit. Then, the degree of attenuation of the absorption wavelength specific to the measurement object is measured from the laser light after passing through the exhaust gas received by the receiver 104, and the concentration of the measurement object in the exhaust gas is measured based on this measurement result. Has been.

  By the way, if the surfaces of the condensing lenses 103 ′ and 104 ′ are contaminated, normal transmission and reception of laser light cannot be performed, and dust or the like is formed on the inner wall surfaces of the mounting tubes 102 and 102. When adhering / depositing, since the laser beam is blocked from passing through each of the attachment tubes 102, 102, there is a problem that the analysis result of the exhaust gas is distorted. Therefore, the purge gas supplied from the header pipes 107 and 107 is continuously ejected into the mounting pipes 102 and 102 via the purge gas supply pipes 108 and 108, and the surfaces of the condenser lenses 103 ′ and 104 ′ are contaminated. Measures are taken to prevent the dust from adhering and depositing on the inner wall surfaces of the mounting pipes 102 and 102. Note that normal air may be used as the purge gas, but in order to prevent fluctuations in the oxygen concentration in the exhaust gas when the oxygen concentration in the exhaust gas is a measurement target for the purpose of combustion control or the like. , Nitrogen and steam are used.

  According to the laser analyzer 100 configured as described above, a laser beam having excellent permeability and capable of being transmitted at a short interval is used as an exhaust gas analysis medium. There is an advantage that the analysis can be repeated accurately and at a very fast cycle without being affected by dust or the like in the exhaust gas.

  Therefore, the laser analyzer 100 sucks a part of the exhaust gas when performing combustion control corresponding to the property (oxygen concentration, etc.) of the exhaust gas near the furnace outlet in real time, or because it contains a high concentration of dust. Therefore, it is particularly suitable for use in cases where normal sampling for continuous analysis is difficult.

  However, according to the conventional laser analyzer 100, the purge gas injection performance of the purge gas supply pipes 108 and 108 is not sufficient. Therefore, if the injection amount of the purge gas is not increased, the deposits in the attachment pipes 102 and 102 are removed. There is a problem that it is difficult to remove. In addition, the conventional laser analyzer 100 is configured to both maintain the state of the surfaces of the condensing lenses 103 ′ and 104 ′ and remove the deposits on the attachment tubes 102 and 102 by jetting purge gas. Therefore, even when it is not necessary to remove the deposits (when the inner wall surfaces of the mounting tubes 102 and 102 are clean), the purge gas is continuously applied to prevent the surfaces of the condensing lenses 103 ′ and 104 ′ from becoming dirty. There is a problem that the supply must continue. As a result, the injection amount of the purge gas per unit time becomes enormous (3000 to 6000 L / h), and the apparatus configuration such as the supply source of the purge gas (such as a nitrogen generator when nitrogen is used) and the pressurizing device are provided. There is a problem that it becomes large scale.

  In addition, since a large amount of purge gas is injected and the total amount of exhaust gas in the waste incineration facility increases, it is difficult to accurately analyze the exhaust gas, especially in the case of small furnaces, excessive burden on the exhaust gas treatment facility in the latter stage, combustion There is a problem that it may become a main factor such as control error.

  Further, when purging with steam without using nitrogen gas or air, the amount of water in the exhaust gas increases, and therefore problems such as corrosion may occur in the exhaust gas treatment facility at the subsequent stage.

  The present invention has been made to solve such problems, and reliably removes dust adhering to the inner wall surface of the mounting pipe with a small amount of jet fluid or without requiring jet fluid. It is an object of the present invention to provide a laser analyzer that can perform the above-described process.

In order to achieve the above object, a laser analyzer according to the first invention comprises:
The main body of the analyzer, the laser light passage part attached to the front surface of the analyzer main body, the tip part of which is attached to the wall of the furnace or flue, and the deposits attached to the inner wall surface of the laser light passage part are removed. In the laser type analyzer provided with the deposit removing means for
The deposit removing means includes a fluid jet nozzle disposed in the laser light passage, and the nozzle is provided with a cylindrical fluid guide at the tip of a Laval nozzle, and the fluid guide In this configuration, an elongated opening is formed in the fluid flow direction.

The laser analyzer according to the second invention is
The main body of the analyzer, the laser light passage part attached to the front surface of the analyzer main body, the tip part of which is attached to the wall of the furnace or flue, and the deposits attached to the inner wall surface of the laser light passage part are removed. In the laser type analyzer provided with the deposit removing means for
The deposit removing means is provided with a shock wave generating electrode that is arranged in the laser light passage and receives a pulse voltage to generate a shock wave.

  In the first or second invention, it is preferable that a lens purge pipe for injecting a purge gas toward the surface of the condenser lens provided in the front portion of the analyzer main body is provided (third invention).

  In any one of the first to third inventions, the amount of deposits deposited in the laser light passage is detected from the amount of laser beam transmitted after passing through the furnace or flue, and the deposits are detected based on the detection result. It is preferable that the removing means is operated (fourth invention).

  The deposit removing means may be periodically operated by a timer (fifth invention).

  According to the first aspect of the present invention, a nozzle that is provided with a Laval nozzle portion and a fluid guide portion as a deposit removal means for the laser light passage portion, and has an elongated opening formed in the fluid guide portion in the fluid flow direction. Therefore, supersonic fluid (air, nitrogen gas, etc.) accompanied by a shock wave having a straight traveling property can be ejected from the nozzle into the laser beam passage. Therefore, it is possible to efficiently remove deposits adhering to and depositing on the inner wall surface of the laser light passage portion with a minimum amount of fluid ejection, and it is possible to reduce running costs for removing deposits. In addition, since a small amount of fluid injection is required, it is possible to suppress the increase in exhaust gas in the furnace, preventing the exhaust gas properties from changing and the combustion state from being changed. be able to. Furthermore, there is an advantage that a large fluid generator, a booster and the like are not required.

  Next, if the configuration of the second invention is adopted, the deposit on the laser light passage can be removed by the shock wave generated by the electric energy, so that it is not necessary to eject the deposit removing fluid. Become. Therefore, it is possible to reduce the size of the fluid generator, the booster, and the like, and it is possible to suppress the increase in the exhaust gas in the furnace, the property fluctuation of the exhaust gas, and the like.

  By adopting the configuration of the third invention, it is possible to prevent the surface of the condenser lens provided at the front portion of the analyzer main body from becoming dirty.

  Adopting the configuration of the fourth invention or the fifth invention makes it possible to reliably remove deposits while minimizing the operation of the deposit removal means.

  Next, specific embodiments of the laser analyzer according to the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a schematic configuration diagram of the laser analyzer according to the first embodiment of the present invention, and FIG. 2 is a sectional view (a) of a nozzle used in the laser analyzer of the present embodiment and its A -A sectional view (b) is shown respectively.

  The laser analyzer according to the present embodiment has a form of a transmitter 1A that collects and transmits laser light and a form of a receiver 1B that collects and receives laser light transmitted from the transmitter 1A. . Transmitter 1A and receiver 1B are attached to main bodies (analyzer main bodies) 4 and 5 and front faces of main bodies 4 and 5, respectively, and attachment tubes (tips for laser light) attached to the wall surface 2 ′ of flue 2 Passage portions) 3 and 3. Further, condenser lenses 4 ′ and 5 ′ are mounted on the front portions of the main bodies 4 and 5, respectively.

  The main body 5 of the receiver 1 </ b> B is connected to a detection device (controller) 6, and intensity data of the laser beam input to the main body 5 is transmitted to the detection device 6.

  The detection device 6 compares the transmitted light amount of the laser light received by the receiver 1B (the light amount of the laser light reaching the receiver 1B) with a preset set value of the transmitted light amount, and based on the comparison result, will be described later. The solenoid valves 13 and 13 are opened and closed.

  Header pipes 10 and 10 for supplying pressurized nitrogen gas (fluid) are provided outside the mounting pipes 3 and 3, respectively. The header pipes 10 and 10 are provided with pressurized nitrogen supply pipes 12 and 12, respectively. Are connected to each other. The tip portions of the pressurized nitrogen supply pipes 12 and 12 are inserted through the lower wall portions of the attachment pipes 3 and 3 and supported so as to protrude into the attachment pipe 3. Further, a nozzle 11 is detachably attached to the side of the tip of the pressurized nitrogen supply pipe 12 on the side of the flue 2. The nozzles 11 and 11 are positioned in the vicinity of the bottom surface in the mounting tubes 3 and 3 so as not to interfere with the laser light passing through the mounting tubes 3 and 3. Furthermore, electromagnetic valves 13 and 13 for switching supply and stop of pressurized nitrogen gas to the nozzle 11 are inserted in the pressurized nitrogen supply pipes 12 and 12, respectively.

  In addition to the pressurized nitrogen supply pipes 12 and 12, the header pipes 10 and 10 are connected to base end portions of small capacity purge pipes (lens purge pipes) 15 and 15. The distal ends of the small capacity purge tubes 15 and 15 are opened below the condenser lenses 4 ′ and 5 ′ in the lower wall portions of the mounting tubes 3 and 3. In this way, pressurized nitrogen gas is constantly sprayed onto the surface of the condenser lenses 4 ′ and 5 ′ through the small-capacity purge pipe 15, and the surfaces of the condenser lenses 4 ′ and 5 ′ can be maintained in a normal state. (Hereinafter, the pressurized nitrogen gas injected into the condenser lenses 4 ′ and 5 ′ is referred to as a purge gas.) In FIG. 1, reference numeral 16 denotes a needle valve for adjusting the injection amount of the purge gas.

  As shown in FIG. 2A, the nozzle 11 has a cylindrical outer tube 20 and a Laval nozzle portion 21 that is mounted on the inner base end side of the outer tube 20. The Laval nozzle portion 21 has a distal end portion formed slightly smaller than the inner diameter of the outer tube 20 and a proximal end portion formed substantially the same diameter as the inner diameter of the outer tube 20. The Laval nozzle portion 21 is supported by the outer tube 20 by being inserted from the proximal end side of the outer tube 20 and being welded to the outer tube 20 at the proximal end portion.

  Here, the Laval nozzle refers to a medium-thinned nozzle whose middle part is squeezed into a throat. According to such a Laval nozzle, when the air pressure on the base end side is made higher than the air pressure on the tip end side, and the fluid velocity at the throat becomes the sonic velocity, air accompanied by a supersonic shock wave is generated from the tip portion. It is known to be ejected.

  In the present embodiment, the pressure of the pressurized nitrogen gas in the throat S of the Laval nozzle portion 21 is sonic, that is, supersonic pressurized nitrogen gas is injected from the tip of the Laval nozzle portion 21. The diameter of the throat S, the distance from the proximal end portion of the Laval nozzle portion 21 to the throat S, the distance from the throat S to the distal end portion of the Laval nozzle portion 21, the diameter of the proximal end opening and the diameter of the distal end opening of the Laval nozzle portion 21, the Laval nozzle The pressure of the pressurized nitrogen gas supplied to the base end portion of the portion 21 is appropriately adjusted.

  A fluid guide portion 22 is provided at the front end of the Laval nozzle portion 21 at the distal end portion of the outer tube 20. In the fluid guide portion 22, a plurality of elongated suction holes (openings) 23 are formed at an equal pitch in the circumferential direction of the outer tube 20 in the axial direction of the nozzle 11. These suction holes 23 suck air from the side of the nozzle 11 when pressurized nitrogen gas is ejected from the Laval nozzle portion 21, and nozzle spray gas (pressurized nitrogen gas ejected from the Laval nozzle portion 23). Takes the role of imparting straightness to the. A threaded portion 24 for attaching the nozzle 11 to the pressurized nitrogen supply tube 12 is provided on the outer peripheral surface of the proximal end portion of the outer tube 21.

According to the laser analyzer (transmitter 1A, receiver 1B) configured as described above, the analysis of the exhaust gas passing through the flue 2 is performed by the following process.
(A) A laser beam is transmitted from the transmitter 1A to the exhaust gas flowing through the flue 2;
(B) The laser light after passing through the exhaust gas is received by the receiver 1B,
(C) In the detection device 6, the intensity distribution with respect to the wavelength of the laser light after passing through the exhaust gas received by the receiver 1B is compared with a preset set value,
(D) Based on the comparison result, when the laser light passes through the exhaust gas, the extent to which the absorption wavelength specific to the measurement object (oxygen, HCl, etc.) in the laser light is absorbed by the exhaust gas is measured. And
(E) Based on the measurement result, the concentration of the measurement object in the exhaust gas is calculated.

  By the way, in the laser analyzer, when dust adhering to the inner wall surface of the mounting tube 3 accumulates more than a certain thickness, the passage of laser light in the mounting tube 3 is blocked by the dust, making it impossible to analyze the exhaust gas. There is a fear. Therefore, dust on the inner wall surface of the attachment tube 3 is removed as follows.

  In the detection device 6, when the transmitted light amount of the laser beam received by the main body 5 of the receiver 1B is less than a predetermined set value of the transmitted light amount, dust on the inner wall surface of the mounting tubes 3 and 3 is laser. It is determined that the material has accumulated to a level that hinders light transmission and reception, and an opening signal is transmitted from the detection device 6 to the electromagnetic valves 13 and 13 to open the electromagnetic valves 13 and 13. Thereby, pressurized nitrogen gas is supplied to the Laval nozzle parts 21 and 21 of the nozzles 11 and 11.

  The pressurized nitrogen gas supplied to the Laval nozzle portion 21 is accelerated to a sonic speed when passing through the throat S, and then further accelerated. From the tip portion of the nozzle 21, a supersonic nozzle injection gas accompanied by a shock wave is obtained. Injected (see arrow a in FIG. 2A). Further, as the nozzle injection gas a is injected, the front portion of the Laval nozzle portion 23 becomes negative pressure, whereby air on the side of each nozzle 21 is sucked into the nozzle 21 from each suction hole 25. The air thus sucked into the nozzle 21 through the suction hole 25 guides the flow of the nozzle injection gas a so as to surround it from the surroundings (see arrow b in FIG. 2A). Then, the flow b of the suction air suppresses the diffusion of the nozzle injection gas a and imparts straightness to the nozzle injection gas a. As a result, the nozzle 21 has a straight jetting gas a with a shock wave from the nozzle 21 and is jetted along the tube wall of the mounting tube 3, and dust deposited on the inner wall surfaces of the mounting tubes 3 and 3 is removed reliably and reliably. Is done.

  As a result of the removal of dust on the inner wall surface of the mounting tube 3 by the injection of the nozzle injection gas a, the detection device 6 determines that the transmitted light amount of the laser light has returned to the set value of the transmitted light amount or more. Then, a close signal is supplied from the detection device 6 to the electromagnetic valves 13 and 13, and the injection of the nozzle injection gas from the nozzle 11 is stopped.

  On the other hand, purge gas is constantly injected from the small-capacity purge pipes 15 and 15 to the condenser lenses 4 'and 5', thereby preventing the surfaces of the condenser lenses 4 'and 5' from being contaminated.

  In the present embodiment, the nozzle 11 is configured to inject a straight supersonic nozzle injection gas a accompanied by a shock wave to remove dust adhering to and accumulating on the inner wall surface of the mounting pipe 3. Therefore, the dust can be efficiently removed by jetting the nozzle jet gas a for a short time. Further, in the present embodiment, the nozzle injection gas a is injected only when the transmitted light amount falls below the set value, so that the injection amount of the nozzle injection gas a can be further reduced. Further, since the nozzle injection gas a and the supply path of the purge gas are separately provided, the injection amount of the purge gas for preventing contamination of the surfaces of the condenser lenses 4 ′ and 5 ′ can be minimized.

  Therefore, the total injection amount of the nozzle injection gas a and the purge gas can be greatly suppressed. As a result, the running cost for dust removal and prevention of contamination on the surfaces of the condensing lenses 4 ′ and 5 ′ can be reduced, a nitrogen gas (pressurized nitrogen gas / purge gas) generator for the header tube 10 and the like, The size of various devices such as devices can be reduced. In addition, since the total injection amount is suppressed, it does not affect the combustion control in the waste incineration facility, and does not impose an excessive burden on the downstream exhaust gas treatment device (such as an air attractor).

  Next, in order to confirm the operational effects of the present embodiment, an adhesion removal test of the attachment tube 3 (102) is performed for each of the laser analyzer of the present embodiment and the conventional laser analyzer 100. The test results are summarized in Table 1.

  As apparent from Table 1, in this embodiment, the surface of the condenser lens 4 ′ (5 ′) is obtained by injecting a total of 800 to 2200 L of gas (nozzle injection gas: 200 to 400 L, purge gas 600 to 1800 L). While the dust in the mounting tube 3 could be removed while preventing the contamination of the conventional pipe, the conventional one had to continuously inject 3000 to 6000 L of purge gas per hour. From this, the laser analyzer of the present embodiment removes dust in the mounting tube 3 and collects the condensing lens 4 ′ with a much smaller amount of gas (pressurized nitrogen gas, purge gas) than the conventional one. , 5 'surface contamination was confirmed to be efficiently prevented. Moreover, in this embodiment, it turns out that the injection time of nozzle injection gas is very short time (0.1-0.3 (s)). From this, it became clear that the dust removal operation according to the present embodiment hardly affects the combustion control performed in the waste incineration facility.

  In the present embodiment, the example in which the nozzle 11 is attached to the pressurized nitrogen supply pipe 12 that is inserted into and supported by the lower wall portion of the attachment pipe 3 has been described, but the passage of laser light in the attachment pipe 3 is not hindered. As long as the arrangement position, the number of installations, and the mounting method of the nozzle 11 are not particularly limited, for example, as shown in FIG. 3, the pressurized nitrogen supply pipe 12 is obliquely attached to the upper wall portion of the attachment pipe 3. The nozzle 11 may be attached to the front end of the pressurized nitrogen supply pipe 12 by penetrating and supporting downward (in the flue 2 direction).

  Further, in the present embodiment, pressurized nitrogen gas is injected as a nozzle injection gas to remove dust in the attachment tube 3. However, when the oxygen concentration is out of the measurement target, oxygen If variation in concentration is allowed, pressurized air may be supplied to the nozzle 11 to remove dust.

  Further, in the present embodiment, the configuration in which the pressurized nitrogen gas is supplied to the nozzle 11 only when the transmission amount of the laser light is lower than the set value is adopted. However, every fixed time interval set by the timer is used. Alternatively, the nozzle injection gas may be injected into the attachment pipe 3.

  In the present embodiment, an example has been described in which the tips of the attachment pipes 3 and 3 of the transmitter 1A and the receiver 1B are attached to the wall surface 2 ′ of the flue 2 and the exhaust gas in the flue 2 is analyzed. The tip portions of the attachment pipes 3 and 3 may be attached to a furnace wall such as an incinerator to analyze the exhaust gas in the furnace.

[Second Embodiment]
Next, a laser analyzer according to a second embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the same reference numerals are assigned to configurations common to the first embodiment, and detailed description thereof is omitted.

  FIG. 4 shows a schematic configuration diagram of the laser analyzer according to the second embodiment, and FIG. 5 shows a schematic configuration diagram (upper half portion) and a pulse voltage supply unit (lower half portion) of the probe used in this embodiment. The circuit diagram of (part) is each shown.

  In the present embodiment, a probe (shock wave generating electrode) 30 for generating a shock wave is disposed on the mounting tubes 3 and 3, and a pulse voltage is supplied to the probe 30 outside the mounting tubes 3 and 3. The pulse voltage supply unit 31 is provided.

  As shown in FIG. 5, the pulse voltage supply unit 31 is arranged in parallel with an AC power supply 32, a voltage-adjusting slidac 33, a transformer 34, a rectifier 35, a charging resistor 36, and a resistor 37. A pulse voltage having an arbitrary amplitude and frequency can be supplied to the probe 30 by mainly adjusting the resistance value of the resistor 37 and the electric capacity of the capacitors 38A and 38B. It is like that. In the figure, reference numeral 39 is a voltmeter, and reference numeral 40 is an ammeter.

  On the other hand, the probe 30 has an inner conductor (conductive wire) 45 arranged in the axial direction of the probe 30 and a cylindrical outer conductor arranged on the outer periphery of the inner conductor 45 at a predetermined interval in the central shaft portion. 46 and an insulator 47 interposed between the inner conductor 45 and the outer conductor 46 except for the tip of the probe 30. Here, the inner conductor 45 and the outer conductor 46 are respectively connected to the pulse voltage supply unit 31.

  According to the probe 30 configured as described above, when the pulse voltage is supplied from the pulse voltage supply unit 31, the tip 45 'of the inner conductor 45 where the insulator 47 is not interposed and the outer conductor 46 A discharge occurs between the tip 46 'and a shock wave SW is generated by this discharge. The shock wave SW removes dust adhering and accumulating on the inner wall surfaces of the mounting tubes 3 and 3.

  In the present embodiment, the deposits on the attachment tube 3 are removed by the shock wave SW generated from the probe 30. Therefore, a gas fluid (pressurized nitrogen gas, pressurized air, etc.) other than the purge gas is used. There is no need to spray into the mounting tube 3. Therefore, an increase in the amount of gas in the waste incineration facility can be further suppressed, and the burden on the exhaust gas treatment facility on the downstream side of the incineration facility can be further reduced.

  In the laser analyzer of this embodiment, as in the first embodiment, a shock wave SW is generated only when the amount of transmitted laser light falls below a set value, or a timer is provided. For example, the shock wave SW can be generated at regular time intervals.

1 is a schematic configuration diagram of a laser analyzer according to a first embodiment of the present invention. Sectional drawing (a) of the nozzle in 1st Embodiment, and AA sectional drawing (b) of Fig.2 (a) Schematic configuration diagram of a laser analyzer according to a modification of the first embodiment Schematic configuration diagram of a laser analyzer according to the second embodiment of the present invention. Schematic configuration diagram (upper half) and circuit diagram of pulse voltage supply unit (lower half) of the probe in the second embodiment Schematic configuration diagram of a conventional laser analyzer

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A Transmitter 2B Receiver 2 Flue 3 Attachment pipe 4 Main body 4 'Condensing lens 5 Main body 5' Condensing lens 6 Analyzer 10 Header pipe 11 Nozzle 15 Small capacity purge pipe 21 Laval nozzle part 22 Fluid guide part 23 Suction hole 30 Probe 31 Pulse voltage generator

Claims (5)

The main body of the analyzer, the laser light passage part attached to the front surface of the analyzer main body, the tip part of which is attached to the wall of the furnace or flue, and the deposits attached to the inner wall surface of the laser light passage part are removed. In the laser type analyzer provided with the deposit removing means for
The deposit removing means includes a fluid jet nozzle disposed in the laser light passage, and the nozzle is provided with a cylindrical fluid guide at the tip of a Laval nozzle, and the fluid guide A laser analyzer having a configuration in which an elongated opening is formed in the fluid flow direction. The main body of the analyzer, the laser light passage part attached to the front surface of the analyzer main body, the tip part of which is attached to the wall of the furnace or flue, and the deposits attached to the inner wall surface of the laser light passage part are removed. In the laser type analyzer provided with the deposit removing means for
The laser analyzer according to claim 1, wherein the deposit removing means includes a shock wave generating electrode that is disposed in the laser light passage and receives a pulse voltage to generate a shock wave.   3. The laser analyzer according to claim 1, further comprising a lens purge tube that injects a purge gas toward a surface of a condensing lens provided in a front portion of the analyzer body.   The amount of deposit deposited in the laser beam passage is detected from the amount of laser beam transmitted after passing through the furnace or flue, and the deposit removing means is operated based on the detection result. The laser analyzer according to any one of the above.   The laser-type analyzer according to claim 1, wherein the deposit removing means is periodically operated by a timer.

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