CN107014750B - The optical transmitting and receiving system of gas in a kind of original position correlation laser monitoring flue - Google Patents
The optical transmitting and receiving system of gas in a kind of original position correlation laser monitoring flue Download PDFInfo
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- CN107014750B CN107014750B CN201710258637.4A CN201710258637A CN107014750B CN 107014750 B CN107014750 B CN 107014750B CN 201710258637 A CN201710258637 A CN 201710258637A CN 107014750 B CN107014750 B CN 107014750B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
- G01N2021/151—Gas blown
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Abstract
The invention discloses a kind of optical transmitting and receiving systems of gas in correlation laser monitoring flue in situ, which includes optical transmitting and receiving device；The optical transmitting and receiving device is made of the laser beam emitting device and laser receiver being oppositely arranged；The laser beam emitting device includes optical path protection cylinder and the laser emitting module for being located at the optical path protection cylinder proximal end, and the laser receiver includes another optical path protection cylinder and the photoelectric detection module for being located at another optical path protection cylinder proximal end；The optical path protection cylinder includes linkage section interconnected and extended segment from proximal end to distal end, which is characterized in that the optical path protection cylinder further includes the optical path adjusting section being located between linkage section and extended segment；The optical path adjusting section includes one section of metal bellows and four adjusting screw rods；The linkage section of the optical path protection cylinder opposite with the optical path adjusting section one is equipped with mounting flange, and other end is equipped with loose flange, and the two is hinged by hinge.
Description
Technical field
The present invention relates to the devices or instrument that are convenient for optic test, in particular to prevent the component of Optical devices from staiing
Or the device of optical path obstacle.
Background technique
For increasingly serious Present Situation of Air Pollution, various countries pay much attention to monitoring thermal power plant, Metallurgical Factory, chemical plant and water
The flue gas emission of the stationary sources such as mud factory, National Environmental Protection Agency also all formulate and have promulgated one after another relevant discharge standard, cause
Power is in the smoke pollution for controlling industrial fixed-contamination boiler.In recent years, carried out a large amount of spectroscopy detection technique both at home and abroad to answer
Used in the correlative study work of Pollution Gas detection, spectroscopy detection technique has high-precision, fast response time, non-contact
Many advantages, such as formula measures.Environmental protection administration is realized by discharging the real-time continuous monitoring of flue to polluted gas to thermal power plant, metallurgy
The supervision of the flue gas emission of the stationary sources such as factory, chemical plant and cement plant.
The measurement method of air flue emission pollutant mainly has extraction-type and in-situ type to measure two kinds, wherein extraction-type detection side
Formula is extracted flue gas out using dedicated heating sampling probe from flue, enters detection after heat tracing transmission and necessary pretreatment
Unit, the pretreatment system usually required that is extremely complex, and detection unit requires tightness height, and for such as sulfur dioxide, ammonia
The easy adsorbed gas such as gas, the gas componant being drawn into detection unit can lose, and cause detection error very big.Relative to pumping
Optical transmitting and receiving device is directly mounted on flue by modus ponens, in-situ type measurement method, make to measure light pass through tested flue gas directly into
The method of row detection, structure is simple, easy for installation, and without complicated pretreatment system, the response time is fast, and measurement result has more
Authenticity.
Application publication number is that " one kind is for carrying out flue gas in flue disclosed in the application for a patent for invention of CN103575659A
The device of detection " is a kind of device of in situ detection flue gas, which is made of laser beam emitting device and laser receiver,
Both have one to be connected by tube body and connecting tube the optical path protection cylinder formed, the distal end of middle tube body be equipped with formed it is anti-with optical path
The gas nozzle of the vertical gas curtain of casing axis, connecting tube side wall are equipped with the interface tube of connection official jargon and pressure gas source, are passed through compression
Positive pressure can be formed after air in optical path protection cylinder, and forms the gas of isolation flue gas at the remote outlet position of optical path protection cylinder
Curtain, the two collective effect can effectively prevent flue gas in flue from polluting to optical device.But side described in the patent application
Case still has following deficiency: 1, lacking optical path adjusting mechanism, installation difficulty is big；2, the Laser emission component in laser beam emitting device
It is all fixedly connected between the laser pick-off component in laser receiver and respective optical path protection cylinder, when dismantling cleaning
It has to recalibrate optical path, it is not only time-consuming and laborious, but also need certain professional skill that could complete；3, lack control institute
The control means of gas curtain flow velocity are stated, and is arranged on the inner tubal wall of the first and second tube body 10,10 ' (being equivalent to optical path protection cylinder) and connects
(multiple) through-hole 12 (see its specification [0011] section and Fig. 2) of logical first and second tube body 10,10 ' lumens and clip cavity, Wu Fabao
The pressure of " clip cavity " interior air described in card, although therefore the gas curtain can completely cut off flue gas, it is axially flowed along optical path protection cylinder
Dynamic air can rush in flue and change the flue gas concentration in optical path, and then seriously affect the accuracy of monitoring result.
Authorization Notice No. is " a kind of original with instrument flange disclosed in the utility application of 203870006 U of CN
The optical path protection cylinder of position formula laser gas analyzer ", the gas analyzer is equipped with optical path adjusting section, the optical path adjusting section packet
A pair of of instrument flange is included, which is equipped with one and tightens bolt and two facula positions adjusting bolts, passes through adjusting
It tightens bolt and facula position adjusts the adjusting that bolt tightness carries out left-right position and upper and lower position to hot spot.However it is above-mentioned
The adjustable range of facula position regulation scheme is smaller, if device install when transmitting unit and receiving unit axis runout compared with
Greatly, then possibly optical path can not be calibrated.It has to recalibrate optical path and edge in addition, the utility model is clearly present when dismantling cleaning
The air that optical path protection cylinder axially flows can rush in flue and change the deficiency of the flue gas concentration in optical path.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of optics of gas in correlation laser monitoring flue in situ
Receive-transmit system, the optical transmitting and receiving system have laser angle adjustable range big, and the cleaning of optical device is simply and easily excellent
Point.
The technical solution that the present invention solves above-mentioned technical problem is:
The optical transmitting and receiving system of gas in a kind of original position correlation laser monitoring flue, which includes optical transmitting and receiving dress
It sets；The optical transmitting and receiving device is made of the laser beam emitting device and laser receiver being oppositely arranged；The laser hair
Injection device includes optical path protection cylinder and the laser emitting module for being located at the optical path protection cylinder proximal end, the laser receiver packet
Include another optical path protection cylinder and the photoelectric detection module for being located at another optical path protection cylinder proximal end；
The optical path protection cylinder includes linkage section interconnected and extended segment from proximal end to distal end, wherein described
The linkage section of optical path protection cylinder one far from the extended segment is equipped with isolation slide；The linkage section of the optical path protection cylinder
Outer wall is equipped with the second suction nozzle；
The extended segment of the optical path protection cylinder is made of the outer cylinder and inner cylinder being coaxially set-located, the outer cylinder and interior
Gap is equipped between cylinder；The end of the extended segment of the optical path protection cylinder is equipped with gas curtain spray head, which is a rectangle
Box, the sandwich which there is the gap between the outer cylinder and inner cylinder to be connected to；The rectangular box with it is described
Optical path protection cylinder axis is respectively equipped with the loophole coaxial with optical path protection cylinder on two vertical faces, with the optical path protection cylinder
The inner wall of the sandwich of a parallel side of axis is equipped with set gap between a column and the outer cylinder and inner cylinder
Opposite another side is directed toward in the spilehole of connection, the outlet of the spilehole, which, which is equipped with, runs through the sandwich
The exhaust notch of inside and outside wall；On the outer wall of the extended segment of the optical path protection cylinder be located at the flue outside position be equipped with
First suction nozzle of the gap connection；
It is characterized in that,
The optical path protection cylinder further includes optical path adjusting section, the optical path adjusting section be located at the linkage section and extended segment it
Between；The optical path adjusting section includes one section of metal bellows and four adjusting screw rods；Wherein, the both ends of the metal bellows
It is respectively equipped with ring flange, four adjusting screw rods are evenly distributed in the surrounding of metal bellows, each adjusting screw rod
Both ends pass through the ring flange respectively and locked respectively by nut；
The linkage section of the optical path protection cylinder opposite with the optical path adjusting section one is equipped with mounting flange, other end
Equipped with loose flange, the isolation slide is located at the middle part of loose flange；The loose flange and mounting flange are hinged by hinge
Together, and the surrounding of the two is buckled together by active lock padlock；Two are equipped between the loose flange and mounting flange to determine
Position pin；
During using gas in above-mentioned optical transmitting and receiving device monitoring flue, the cleaning that will be accessed from the first suction nozzle
Air protects gas as the first order, protects gas for the clean air accessed from the second suction nozzle as the second level, then passes through control
Air inflow processed controls the flow velocity of first order protection gas and second level protection gas intersection in the gas curtain spray head respectively, so that the
First class of protection gas is greater than the flow velocity of second level protection gas in the flow velocity of the intersection.
In above scheme, it is coaxially provided with air flow method circle in the linkage section of the optical path protection cylinder, the air flow method circle
One the isolation slide is covered in it, and between its outer wall and the inner wall of optical path protection cylinder linkage section formed one closing
Annular space, on the peripheral wall of the air flow method circle the position close to the isolation surface of glass slide be uniformly provided with several with
The purge hole of the annular space connection.So the purge gass accessed by the second suction nozzle are uniformly distributed with air flow method circle
In the surrounding of isolation slide, purge gass can be made uniformly to blow over the front of isolation slide, purging effect is more preferable.
The present invention has the following beneficial effects: compared to the prior art
1, the optical path adjusting section of the optical path protection cylinder dexterously utilizes the compressible and curved characteristic of metal bellows, can
Facula position is adjusted on a large scale.
2, only need to open activity lock can turning over movable ring flange, expose isolation slide cleaned, cleaning finishes
Moving flange plate is directly closed afterwards and locks activity lock.Further, since the effect of positioning pin, nothing after the completion of cleaning
Optical path need to be recalibrated, so that cleaning becomes simple, easy to operate.
3, present technology has been abandoned to be connected in the set gap between outer cylinder and inner cylinder that optical path protection cylinder extended segment is arranged
Through-hole, and by control air inflow make the first order protect gas the intersection flow velocity be greater than the second level protect gas stream
Speed is formed by gas curtain using first order protection gas and second level protection vapour lock is broken, it is ensured that second level protection gas will not rush
Out optical path protection cylinder and change the flue gas concentration in optical path, and then significantly improve monitoring flue in gas accuracy.
Detailed description of the invention
Fig. 1 is that the use state of a specific embodiment of optical transmitting and receiving device in optical transmitting and receiving system of the present invention is shown
It is intended to.
Fig. 2~8 are the structural schematic diagram of laser beam emitting device in embodiment illustrated in fig. 1, wherein Fig. 2 is that main view (cuts open
Depending on), Fig. 3 is the A-A cross-sectional view of Fig. 2, and Fig. 4 is the B-B cross-sectional view of Fig. 2, and Fig. 5 is the C-C cutaway view Amplified image of Fig. 3, Fig. 6 Fig. 2
The enlarged drawing of middle part I, Fig. 7 are the enlarged drawing of part II in Fig. 2, and Fig. 8 is the D-D cross-sectional view of Fig. 7.
Fig. 9 is the schematic perspective view of gas curtain spray head in laser beam emitting device shown in Fig. 2~8.
Figure 10 is the schematic perspective view of laser beam emitting device shown in Fig. 2~8.
Figure 11 is the functional block diagram of optical transmitting and receiving system of the present invention.
Specific embodiment
Referring to Figure 11, optical transmitting and receiving system of the present invention is filled by the optical transmitting and receiving device of correlation type, protection gas control system
Set 18 and gas piping and valve composition.Wherein, the optical transmitting and receiving device of the correlation type by laser beam emitting device 15 and swashs
Optical receiver apparatus 16 forms；Protect gas control device 18 by flow controlling unit, first order protection gas control device and the second level
Protect gas control device composition.The first order protection gas control device and second level protection gas control device is respectively by electronics
Flow valve is connected and composed with electronic flowmeter；The flow controlling unit is conventional gas flow rate control unit, it is by list
The driving circuit of piece machine and driving electronic flow valve and electronic flowmeter forms.
Referring to Fig. 1, the optical transmitting and receiving system of gas includes correlation type in the correlation laser monitoring flue in situ in this example
Optical transmitting and receiving device, which includes opposite being mounted on the laser beam emitting device 15 of 1 two sides of flue and laser connects
Receiving apparatus 16 is both mounted on the side wall of flue 1 by flange mounting base 2；Wherein the laser beam emitting device is by coaxial
Concatenated optical path protection cylinder 3 and laser emitting module 4 form, and the laser receiver is prevented by coaxial concatenated another optical path
Casing 3 and photoelectric detection module 5 form.
It is formed since the laser beam emitting device and laser receiver concatenate optical device by optical path protection cylinder 3, with
Under the specific embodiment of this example is only introduced by taking laser beam emitting device as an example.
Referring to fig. 2, the optical path protection cylinder 3 is by sequentially coaxially concatenated extended segment 6, optical path adjusting section and 8 groups of linkage section
At.
Referring to fig. 2 and combine Fig. 6~9, the extended segment 6 include coaxial arrangement outer cylinder 6-1 and inner cylinder 6-2, the two it
Between be equipped with annular gap 6-4；One of the outer cylinder 6-1 and inner cylinder 6-2 is welded on the one side of a piece of ring flange jointly, another
Head is equipped with gas curtain spray head；The gas curtain spray head is a rectangular box 14 for being covered on outer cylinder 6-1 and the end inner cylinder 6-2, the rectangular box
The sandwich that there is 14 surroundings the gap 6-4 between the outer cylinder 6-1 and inner cylinder 6-2 to be connected to；In the rectangular box 14 with
It is respectively equipped on vertical two faces (i.e. the left and right two sides of rectangular box 14 in Fig. 7) of optical path protection cylinder axis same with optical path protection cylinder
The loophole 14-2 of axis penetrated for laser light source, a side parallel with the axis of optical path protection cylinder (i.e. rectangular box in Fig. 7
14 one sides being located above) the inner wall of the sandwich be equipped with a column and be parallel to each other spilehole 14-1, a column are stingy
The axis of hole 14-1 is located in a plane vertical with the axis of optical path protection cylinder, and all spilehole 14-1 with outer cylinder 6-1
The set gap 6-4 connection between inner cylinder 6-2；The face opposite with the face of stomata 14-1 is equipped with is (i.e. in Fig. 7 in the rectangular box 14
The underlying one side of rectangular box 14) it is equipped with the exhaust notch 14-3 for running through the sandwich inner wall and outer wall；It is described outer
The outer wall of cylinder 6-1 is equipped with connection the first suction nozzle of gap 6-4 6-5, and middle part is equipped with one for connecting with flange mounting base 2
The mounting flange 6-3 connect.
Referring to fig. 2, Fig. 3 and Fig. 5 and Figure 10 is combined, one of the linkage section 8 of the optical path protection cylinder is coaxially provided with therewith
The mounting flange 8-1 to connect together is welded, other end is equipped with the loose flange 8-2 for being coaxially tightly attached to its end face；The loose flange
The middle part of 8-2 is equipped with the isolation slide 13 of an isolation flue gas, which is a planar lens being slightly slanted；The work
Dynamic flange 8-2 is hinged by a hinge 11 and mounting flange 8-1, and the surrounding of the two is also uniformly equipped with four connections
The activity lock 12 of the two；Two positioning pin 8-3, positioning pin 8- are equipped between the loose flange 8-2 and mounting flange 8-1
3 one are fixedly connected with mounting flange 8-1, and other end, which extends to loose flange 8-2 and is inserted into be located on loose flange 8-2, to be corresponded to
In the location hole of position；
An air flow method circle 8-4 is also coaxially provided in the linkage section 8 of the optical path protection cylinder；Air flow method circle 8-4's
One covers on the isolation slide 13 in it, and other end welds together with the mounting flange 8-1, and its outer wall and light
A closed annular space 8-5 is formed between the inner wall of road protection cylinder linkage section 8；On the peripheral wall of the air flow method circle 8-4
Four purge hole 8-6 being connected to the annular space are uniformly provided with close to the position on isolation 13 surface of slide；Described
The outer wall of the linkage section 8 of optical path protection cylinder is equipped with the second suction nozzle 8-7 being connected to the annular space 8-5.
Referring to fig. 2 with Fig. 4 and in conjunction with Figure 10,7 He of metal bellows of the both ends optical path adjusting Duan Youyi flange plate
Four adjusting screw rods 9 form；Wherein, the two panels ring flange respectively with ring flange set by extended segment 6 one and linkage section 8
Mounting flange 8-1 is connected by fastening bolt 10；Four adjusting screw rods 9 are evenly distributed in the surrounding of metal bellows 7,
The both ends of each adjusting screw rod 9 are passed through the ring flange at 7 both ends of metal bellows respectively and are locked respectively by nut.
Referring to fig. 2, the laser emitting module 4 is mounted on linkage section 8 one moving flange plate 8-2.
Referring to Fig. 1, the difference of the laser receiver and laser beam emitting device is only that swashing laser beam emitting device
Optical transmitter module 4 replaces with photoelectric detection module 5, due to laser emitting module 4 and photoelectric detection module 5 embodiment and
The principle that gas analysis is carried out using laser spectrum is the prior art, and details are not described herein again.
Below in conjunction with the purging course of work of optical transmitting and receiving device in Brief Description Of Drawings this example:
Referring to Figure 11 and Fig. 1 and Fig. 7 is combined, using transmission cable and signal cable by optical transmitting and receiving described in the present embodiment
System and commercially available laser analyzer 17 connect the flue gas that can monitor the discharge of flue 1.The specific following institute of monitoring process
State: when work, the laser that driving circuit control laser generates is sent to the laser in laser beam emitting device 15 by transmission cable
Transmitting module 4, the optical signal which issues are transmitted to laser receiver 16 through the flue gas in flue 1；Laser
Photoelectric detection module 5 in reception device 16 will test optical signal transformation electric signal, which send through signal cable to laser
Signal conditioning unit in analyzer 17 obtains analysis result after calculating by conditioning and retrieving concentration.In above-mentioned detection, analysis
In the process, it is passed through clean compressed air to the first suction nozzle 6-5 and the second suction nozzle 8-7 respectively, and will be from the first suction nozzle
The clean compressed air of 6-5 access protects gas, the clean compressed air that will be accessed from the second suction nozzle 8-7 as the first order
Gas is protected as the second level.Then, it protects the flow controlling unit in gas control device 18 to adjust two electronic flow valves respectively, leads to
The flow velocity that control air inflow controls first order protection gas and second level protection gas intersection in the gas curtain spray head respectively is crossed, is made
Obtain the flow velocity that first order protection gas is greater than protection gas in the second level in the flow velocity of the intersection.The first order protection gas is by gas curtain
The front end that extended segment 6 is ejected in one column spilehole 14-1 of spray head forms the gas curtain of an isolation flue gas (see the solid arrow in Fig. 7
Head)；Second level protection gas forms positive pressure in optical path protection cylinder, and is constantly purged outward along optical path protection cylinder (see the sky in Fig. 7
Heart arrow)；Gas can be protected to be formed by gas curtain volume by the first order when so protection air-flow is moved to close to gas curtain spray head when the second level
It takes from the exhaust notch 14-3 and is discharged, do not influence the smoke components in optical path.
Claims (2)
1. the optical transmitting and receiving system of gas in a kind of original position correlation laser monitoring flue, which includes optical transmitting and receiving device；
The optical transmitting and receiving device is made of the laser beam emitting device and laser receiver being oppositely arranged；The Laser emission dress
It sets including optical path protection cylinder and the laser emitting module for being located at the optical path protection cylinder proximal end, the laser receiver includes another
One optical path protection cylinder and the photoelectric detection module for being located at another optical path protection cylinder proximal end；
The optical path protection cylinder and another optical path protection cylinder are from proximal end to distally including linkage section interconnected and extended segment；
Wherein, the linkage section one far from the extended segment is equipped with isolation slide；The outer wall of the linkage section is equipped with the
Two suction nozzles；
The extended segment is made of the outer cylinder and inner cylinder being coaxially set-located, and gap is equipped between the outer cylinder and inner cylinder；
The end of the extended segment is equipped with gas curtain spray head, which is a rectangular box, the rectangular box surrounding have with it is described outer
The sandwich of gap connection between cylinder and inner cylinder；The rectangular box two faces vertical with corresponding optical path protection cylinder axis
On be respectively equipped with the loophole coaxial with the optical path protection cylinder, the institute of a side parallel with corresponding optical path protection cylinder axis
The inner wall for stating sandwich is equipped with the spilehole that a column are connected to gap set between the outer cylinder and inner cylinder, the spilehole
Opposite another side is directed toward in outlet, which is equipped with the exhaust notch through the sandwich inside and outside wall；Described
The first suction nozzle being connected to the gap is equipped on the outer wall of extended segment in the position being located at outside the flue；
It is characterized in that,
The optical path protection cylinder and another optical path protection cylinder further include optical path adjusting section, which is located at the connection
Between section and extended segment；The optical path adjusting section includes one section of metal bellows and four adjusting screw rods；Wherein, the metal
The both ends of bellows are respectively equipped with ring flange, and four adjusting screw rods are evenly distributed in the surrounding of metal bellows, often
The both ends of one adjusting screw rod are passed through the ring flange respectively and are locked respectively by nut；
The linkage section opposite with the optical path adjusting section one is equipped with mounting flange, and other end is equipped with loose flange, institute
State the middle part that isolation slide is located at loose flange；The loose flange and mounting flange are hinged by hinge, and the two
Surrounding is buckled together by active lock padlock；Two positioning pins are equipped between the loose flange and mounting flange；
During using gas in above-mentioned optical transmitting and receiving device monitoring flue, the clean air that will be accessed from the first suction nozzle
As the first order protect gas, using clean air access from the second suction nozzle as the second level protection gas, then pass through control into
Tolerance controls the flow velocity of first order protection gas and second level protection gas intersection in the gas curtain spray head respectively, so that the first order
Gas is protected to be greater than the flow velocity of second level protection gas in the flow velocity of the intersection.
2. the optical transmitting and receiving system of gas, special in a kind of correlation laser monitoring flue in situ according to claim 1
Sign is, air flow method circle is coaxially provided in the linkage section, and one of the air flow method circle by the isolation slide cover
In it, and a closed annular space, the week of the air flow method circle are formed between its outer wall and the inner wall of the linkage section
Several purge holes being connected to the annular space are being uniformly provided with close to the position of the isolation surface of glass slide on wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710258637.4A CN107014750B (en) | 2017-04-19 | 2017-04-19 | The optical transmitting and receiving system of gas in a kind of original position correlation laser monitoring flue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710258637.4A CN107014750B (en) | 2017-04-19 | 2017-04-19 | The optical transmitting and receiving system of gas in a kind of original position correlation laser monitoring flue |
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| CN107014750B true CN107014750B (en) | 2019-09-13 |
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