CN105259137A - Automatic absorption spectrum online in-situ measuring device for laser ammonia escape of pipeline - Google Patents
Automatic absorption spectrum online in-situ measuring device for laser ammonia escape of pipeline Download PDFInfo
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- CN105259137A CN105259137A CN201510753139.8A CN201510753139A CN105259137A CN 105259137 A CN105259137 A CN 105259137A CN 201510753139 A CN201510753139 A CN 201510753139A CN 105259137 A CN105259137 A CN 105259137A
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Abstract
The invention provides an automatic absorption spectrum online in-situ measuring device for laser ammonia escape of a pipeline. The device comprises a laser emitting system, a laser receiving system and two welding flange mounting units, wherein the laser emitting system and the laser receiving system are respectively fixed on two opposite sides of a pipeline through one of the welding flange mounting units; the laser emitting system comprises a first shell, a modulating signal generating plate, a laser driving power supply plate, a laser device and a light beam expanding collimating lens; the modulating signal generating plate, the laser driving power supply plate and the laser device are arranged in the first shell; the light beam expanding collimating lens is mounted on the first shell; the laser receiving system comprises a second shell, a detector, a pre-amplification circuit board, a lock-in amplifier plate, a signal processing plate, a display screen driving plate, a light beam gathering lens and a display screen; the detector, the pre-amplification circuit board, the lock-in amplifier plate, the signal processing plate and the display screen driving plate are arranged in the second shell; the light beam gathering lens and the display screen are mounted on the second shell. The automatic absorption spectrum online in-situ measuring device for laser ammonia escape has the advantages of simple structure, convenience in operation, fast response, accurate measuring result, high stability, non-bypass monitoring, and the like.
Description
Technical field
The present invention relates to pipeline the escaping of ammonia gas analysis technology field, specifically a kind of pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device.
Background technology
Such as, in the field of extensive burning mineral fuel, coal-fired power plant, front combustion or after-burning NO are all installed
xthe denitrification apparatus of control technology, after-burning NO
xcontrol technology can be selective catalytic reduction, also can be SNCR method, but no matter apply which kind of method, and ultimate principle is all the same, being namely all by injecting ammonia and oxides of nitrogen reacts in reactor, producing water and N
2.The ammonia injected can directly with NH
3form, also can first by urea decomposition release obtain NH
3reflooded form, quovis modo, controls the total injection of ammonia and the space distribution of ammonia in reaction zone well and just can reduce NO substantially
xdischarge.It is very few that ammonia injects, and will reduce reduction transformation efficiency, and it is excessive that ammonia injects, and can not can not reduce NO
xdischarge, on the contrary because excess of ammonia causes NH
3escape out the NH of reaction zone, escape
3to react generation ammonium sulfate with the sulfate that produces in technological process, and be all mainly heavy ammonium sulfate.Ammonium salt can precipitate on boiler back end ductwork downstream solid parts surface, such as, be deposited on air preheater covering of the fan, can cause serious equipment corrosion, and therefore brings expensive maintenance cost.The ammonia distribution situation injected in reaction zone and NO and NO
2distribution also there will be the escaping of ammonia phenomenon when not mating, the situation that high ammonia amount is escaped is along with NO
xit is a kind of very bad phenomenon and very serious problem that transformation efficiency reduces.Escape the NH of falling
3not only cause the waste of fund, environmental pollution, also will corrode catalyst module, cause catalyst failure and blocking, greatly shorten catalyst life.The NH simultaneously escaped
3meeting and the SO in air
3generate ammonium sulfate (there is corrosivity and cohesiveness), cause the blocking of air preheater heat accumulating element and the corrosion that are positioned at denitration downstream.Therefore, accurate real time on-line monitoring ammonia slip concentration is necessary.
Conventional the escaping of ammonia gas on-line measurement device, as follows:
(1) that mentions as Chinese invention patent ZL201310085119.9 mixes the flying dust of electric precipitator first electric field ash bucket with water, obtain testing sample solution, controlling water cement ratio is (20 ~ 100): 1 and the pH value of testing sample solution be 6.0 ~ 6.8, make the ammonia overwhelming majority in flying dust even all soluble in water, and the escaping of ammonia can not occur, thus obtain the result of the escaping of ammonia.The method can not Real-time Obtaining the escaping of ammonia result, easily causes the hysteresis quality of control, to controlling ammonia ratio in real time, reducing environmental pollution and there is certain defect.
(2) extraction-type catalytic reduction method the escaping of ammonia measurement mechanism: usually adopt heating type to extract ammonia, by NH
3first be converted into NO, adopt chemical fluorescence analysis to detect micro-NO, then change the measured value of ammonification, there is converter conversion efficiency problem.In addition, there is moisture to influence factors such as the absorptions of Ammonia in the sampling of sample gas and transmitting procedure, make to extract analytic approach measurement Ammonia very difficult, accuracy is also difficult to ensure.
(3) laser in-situ is measured: without the need to sampling, directly measure ammonia slip concentration, and do not have sample gas to sample and transmit the impact and dust interference that bring, the conversion efficiency problem that also there is not converter causes secondary pollution.Adopt laser analysis in site measurement Ammonia to escape, have more representativeness.
T unable filter (TunableDiodeLaserAbsorptionSpectroscopy, TDLAS) Typical Representative as laser spectrum has a lot of significant advantage, as: the monochromaticity that (1) utilizes semiconductor laser good, the interference that " single line spectrum " technology of employing avoids background gas to absorb; (2) tunability of semiconductor laser wavelength is utilized to solve dust, form pollution to the impact of measuring; (3) without the need to pre-service of sampling, fast response time, is convenient to control production run; (4) field survey, the not easily distortion of gas information, measured value is the online mean concentration of gas in pipelines; (5) instrument is without sports apparatus, and reliability is high, easy to maintenance, and operating cost is close to zero (being only the electricity charge); (6) can auto modification environment temperature, pressure change on measure impact; (7) non-cpntact measurement, has the adaptive faculty of the severe industrial environment such as very strong high temperature, high dust and deep-etching.Therefore, t unable filter is that the feasibility of the automatic on-line in site measurement in the escaping of ammonia gas analysis field of power plant, chemical enterprise, cement production enterprise etc. is laid a good foundation.
Summary of the invention
The object of the present invention is to provide a kind of pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device, overcome conventional the escaping of ammonia measurement mechanism and need the weak point such as sample, pre-service, to meet the demand of the escaping of ammonia real-time online in site measurement required for the industrial enterprise such as power plant, chemical enterprise, cement production enterprise and warning.
Technical scheme of the present invention is:
A kind of pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device, this device comprises laser transmitting system, laser receiver system and two welding flange installation units, and described laser transmitting system and laser receiver system are fixed on the correlation both sides of pipeline respectively by a welding flange installation unit;
The beam expander collimation lens that described laser transmitting system comprises the first housing, is arranged on the modulation signal generation plate of the first enclosure interior, laser drive power plate and laser instrument and is arranged on the first housing; Described laser receiver system comprises the second housing, is arranged on the detector of the second enclosure interior, pre-amplification circuit plate, lock-in amplifier plate, signal-processing board and display screen drive plate and the beams converge lens installed on the second housing and display screen;
Described modulation signal generation plate is connected with the input end of laser instrument with the output terminal of laser drive power plate, described beam expander collimation lens is arranged on the output light path of laser instrument, modulated laser for exporting laser instrument carries out beam-expanding collimation, forms laser alignment light beam;
Described beams converge lens are used for converging the laser alignment light beam after the gaseous ammonia aspiration receipts to be measured of pipe interior, formed on dot projection to detector and carry out opto-electronic conversion, the output terminal of described detector is connected with the input end of lock-in amplifier plate by pre-amplification circuit plate, the input end of described lock-in amplifier plate is connected with the output terminal of modulation signal generation plate, the described output terminal of lock-in amplifier plate is connected with the input end of signal-processing board, and the output terminal of described signal-processing board is connected with the input end of display screen by display screen drive plate.
Described pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device, this device also comprises nitrogen and purges unit, and the gas outlet that described nitrogen purges unit is communicated with the air intake opening of laser transmitting system, laser receiver system and welding flange installation unit respectively by copper pipe;
Described first enclosure interior is also provided with malleation starting protection device and the first power conversion board, described first power conversion board is connected with power supply by malleation starting protection device, for when malleation starting protection device is in closure state, supply voltage is converted to the operating voltage of modulation signal generation plate and laser drive power plate;
Described second enclosure interior is also provided with second source change-over panel, and described second source change-over panel is connected with power supply, for supply voltage being converted to the operating voltage of pre-amplification circuit plate, lock-in amplifier plate, signal-processing board and display screen drive plate.
Described pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device, described welding flange installation unit comprises locking clip, the window glass ring of built-in cleaning glass, optical window eyeglass, instrument flange, O type rubber seal, erecting and welding flange, bolt, nut, one-way cock and stainless-steel tube, described locking clip is used for the first housing or the second housing and instrument flange to be fixed together, described window glass ring is arranged on the exit end of laser transmitting system or the incidence end of laser receiver system, described optical window eyeglass is arranged on instrument flange, described instrument flange is fixedly connected with by screw bolt and nut with erecting and welding flange, and adopt O type rubber seal to seal, described erecting and welding flange is fixed on pipeline by stainless-steel tube, described one-way cock is arranged between erecting and welding flange and stainless-steel tube.
Described pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device, described pipe interior is provided with temperature sensor and pressure transducer, and described temperature sensor is connected with the input end of signal-processing board with the output terminal of pressure transducer.
Described pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device, described first housing and the second housing are all the box seal casinghousing of the pkt. flap be prepared from by casting aluminium material.
Described pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device, described modulation signal generation plate comprises low frequency 30Hz sawtooth signal generating unit and high frequency 10KHz sine wave signal generating unit, described laser drive power plate comprises the temperature controller and current controller that drive laser normally works, and described laser instrument adopts center output wavelength to be the semiconductor laser with tunable of 1.53um.
Described pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device, the input end of described lock-in amplifier plate is connected by multi-core coaxial shielded cable with the output terminal of modulation signal generation plate.
Described pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device; described malleation starting protection device adopts pressure switch; described pressure switch is used for when the first enclosure interior is positive pressure of nitrogen state; remain closed; when the first enclosure interior air pressure is less than or equal to external atmosphere pressure, remain open.
Described pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device, described power acquisition DC-24V power supply.
Described pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device, described cleaning glass adopts CaF
2be prepared from, the angle be arranged between the cleaning glass of laser transmitting system exit end and laser receiver system incidence end and laser alignment light beam is 30 degree, and the cleaning glass at two ends is non-parallel mounting structure.
Beneficial effect of the present invention is:
(1) the present invention can realize the real-time online in-situ monitoring to pipe interior gas in measuring process, ensure that the accuracy of measurement, and the change of pipe interior ammonia slip concentration can being reflected rapidly, laying a good foundation for controlling ammonia quantity delivered in real time.
(2) laser transmitting system of the present invention and laser receiver system adopt correlation to be installed on pipeline both sides, avoid bypass type and extraction-type and install the shortcoming that cannot reflect whole pipe interior the escaping of ammonia situation, improve the accuracy of measurement.
(3) associated laser emission element and laser pick-off parts are all placed in enclosure interior and seal by the present invention, and make whole enclosure interior keep barotropic state, both meet the requirement of electrical security, also may be used for the occasions such as anti-flaming, explosion-proof, expand application of the present invention.
(4) the present invention adopts second harmonic and first harmonic ratio method of elimination to eliminate because dust, laser power fluctuating isocandela fluctuate on the impact of measurement result.
(5) the present invention revises measurement result according to temperature, pressure change, further increases measurement accuracy.
(6) each several part of the present invention integration packaging respectively, structure is simple, and easy to operate, response fast, stability is high.
Accompanying drawing explanation
Fig. 1 is apparatus structure schematic diagram of the present invention;
Fig. 2 is laser transmitting system enclosure interior block diagram of the present invention;
Fig. 3 is laser receiver system enclosure interior block diagram of the present invention;
Fig. 4 is welding flange installation unit decomposing schematic representation of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in Figure 1 to 4, a kind of pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device, comprises laser transmitting system 1, laser receiver system 2, nitrogen purging unit 3, welding flange installation unit 4.Laser transmitting system 1 is arranged on the correlation both sides of pipeline 5 after being connected respectively by welding flange installation unit 4 with laser receiver system 2.
Laser transmitting system 1 comprises housing 10, malleation starting protection device 11, power conversion board 12, modulation signal generation plate 13, laser drive power plate 14, Distributed Feedback Laser 15 and beam expander collimation lens 16.Housing 10 adopts the box casting aluminium material of enclosure-type pkt. flap to process; malleation starting protection device 11, power conversion board 12, modulation signal generation plate 13, laser drive power plate 14 and Distributed Feedback Laser 15 are placed in housing 10 inside and install in order and put, and beam expander collimation lens 16 is installed on the housing 10.
Malleation starting protection device 11 comprises pressure switch, and its normal operating conditions is positive pressure of nitrogen state, and pressure switch remains closed, and laser transmitting system 1 is in running order; When air pressure is less than or equal to external atmosphere pressure, pressure switch remains open, and laser transmitting system 1 is in off working state.Power conversion board 12 is connected with DC-24V power supply by malleation starting protection device 11, and its effect is the operating voltage be converted to by the 24V supply voltage of input required for modulation signal generation plate 13 and laser drive power plate 14.Modulation signal generation plate 13 comprises low frequency 30Hz sawtooth signal generating unit and high frequency 10KHz sine wave signal generating unit, its medium and low frequency 30Hz sawtooth signal generating unit makes the scanned ammonia central absorption wavelength of the output wavelength of Distributed Feedback Laser 15, the acting in conjunction of high frequency 10KHz sine wave signal generating unit, on Distributed Feedback Laser 15, makes Distributed Feedback Laser 15 produce modulated laser.Laser drive power plate 14 comprises the temperature controller and current controller that drive Distributed Feedback Laser 15 normally to work.Distributed Feedback Laser 15 is semiconductor laser with tunable, and center output wavelength is 1.53um.The effect of beam expander collimation lens 16 is that the laser launched by Distributed Feedback Laser 15 carries out beam-expanding collimation, forms the laser alignment light beam 6 directive opposite laser receiver system 2 that spot diameter is about 2cm.
Laser receiver system 2 comprises housing 20, power conversion board 21, beams converge lens 22, InGaAs detector 23, pre-amplification circuit plate 24, lock-in amplifier plate 25, signal-processing board 26, LCD display drive plate 27 and LCD display 28, housing 20 adopts the box casting aluminium material of enclosure-type pkt. flap to process, power conversion board 21, InGaAs detector 23, pre-amplification circuit plate 24, lock-in amplifier plate 25, signal-processing board 26 and LCD display drive plate 27 are placed in housing 20 inside and install in order and put, beams converge lens 22 and LCD display 28 are installed on the housing 20.
Power conversion board 21 is connected with DC-24V power supply, and its effect is the operating voltage 24V supply voltage of input being converted to pre-amplification circuit plate 24, lock-in amplifier plate 25, signal-processing board 26 and LCD display drive plate 27.The effect of beams converge lens 22 is that the laser alignment beams converge diameter received being about 2cm becomes area to be less than 1mm
2small light spot, be incident upon on InGaAs detector 23 and carry out photoelectric signal transformation.Reference sinusoidal signal required for lock-in amplifier plate 25 is produced by modulation signal generation plate 13, and lock-in amplifier plate 25 is connected by multi-core coaxial shielded cable 9 with modulation signal generation plate 13.The integral time of lock-in amplifier plate 25, enlargement factor, phase place all regulate by instruction.The first harmonic signal that signal-processing board 26 pairs of lock-in amplifier plates 25 produce and second harmonic signal carry out light intensity correcting process, according to the result inverting gas concentration after process, also gather the temperature and pressure value of pipeline 5 inside of the temperature sensor being arranged on pipeline 5 inside and pressure transducer measurement, to revise the impact of pipeline 5 internal temperature and pressure on gas concentration simultaneously.
In order to the security of assurance device, meet requirement of explosion proof, laser transmitting system 1 and laser receiver system 2 are all in positive pressure of nitrogen state.Nitrogen purges unit 3 and uses compressed nitrogen for source of the gas, can make during in-site installation to be fixed by bolts to the position between laser transmitting system 1 and laser receiver system 2, and source of the gas is received the air intake opening 8 of every part by 8mm copper pipe 7, keep internal positive pressure (laser transmitting system 1 and laser receiver system 2), prevent dust and other pollutant to the pollution (welding flange installation unit 4) of optical window eyeglass 42.
Welding flange installation unit 4 comprises locking clip 40, the window glass ring 41 of built-in cleaning glass 410, optical window eyeglass 42, DN50 instrument flange 43, O type rubber seal 44, DN50 erecting and welding flange 45, bolt 46, nut 47, DN50 one-way cock 48 and Φ 50 stainless-steel tube 49.Locking clip 40 is for being connected to a fixed housing 10,20 and DN50 instrument flange 43.Window glass ring 41 is arranged on the exit end of laser transmitting system 1 and the incidence end of laser receiver system 2 respectively.Optical window eyeglass 42 is arranged on DN50 instrument flange 43.DN50 instrument flange 43 is fixedly connected with nut 47 by bolt 46 with DN50 erecting and welding flange 45, and adopts O type rubber seal 44 to seal.DN50 erecting and welding flange 45 is fixed on pipeline 5 by Φ 50 stainless-steel tube 49.
The material of preparing of cleaning glass 410 is CaF
2, allowable stress is up to 5bar (absolute pressure).Inclination angle between the cleaning glass 410 at two ends and laser alignment light beam 6 is 30 degree, and the cleaning glass 410 at two ends is non-parallel mounting structure, for eliminating the optical window eyeglass 42 at two ends due to the caused interference fringe that be arranged in parallel.DN50 one-way cock 48 is arranged between DN50 erecting and welding flange 45 and Φ 50 stainless-steel tube 49, DN50 one-way cock 48 is in closed condition in housing 10,20 installation process, after treating that housing 10,20 installs, open DN50 one-way cock 48 and can carry out the aligning of light path and the on-line real time monitoring of ammonia slip concentration.
Principle of work of the present invention:
Laser transmitting system 1 and laser receiver system 2 are fixed on the coaxial correlation both sides of pipeline 5 respectively by welding flange installation unit 4, and its misalignment angle is less than 2 degree.Nitrogen purges unit 3 and is installed between laser transmitting system 1 and laser receiver system 2, external factory nitrogen supply (NS) house steward or compressed air pump, then by 8mm copper pipe 7 respectively with laser transmitting system 1, laser receiver system 2, the air intake opening 8 of welding flange installation unit 4 is connected, keep housing 10, 20 inside are barotropic state, malleation starting protection device 11 is made to be in closure state, connect DC-24V power supply, simultaneously, for preventing pipeline 5 inner dust attachment optical window eyeglass 42 interference measurement results, positive nitrogen is used to be purged optical window eyeglass 42 in real time by air intake opening 8.
After switching on power, laser drive power plate 14 is in running order, Distributed Feedback Laser 15 is driven normally to work, modulation signal generation plate 13 produces low frequency sawtooth signal wave and high frequency sinusoidal signal ripple, be added on Distributed Feedback Laser 15, make Distributed Feedback Laser 15 output wavelength be the modulating lasering beam of ammonia central absorption wavelength.The modulating lasering beam that Distributed Feedback Laser 15 exports, after beam expander collimation lens 16 expands and collimates, obtains the laser alignment light beam 6 that diameter is about 2cm.Laser alignment light beam 6, after the gaseous ammonia aspiration to be measured of piping 5 inside is received, arrives laser receiver system 2.
Laser alignment light beam 6 converges on the photosurface of InGaAs detector 23 by the beams converge lens 22 of laser receiver system 2 inside, and its focused light spot size is about less than 1mm
2.Signal after InGaAs detector 23 opto-electronic conversion sends into pre-amplification circuit plate 24 by multi-core coaxial shielded cable 9, voltage signal after amplifying is sent into lock-in amplifier plate 25 and is carried out demodulation, obtains corresponding first harmonic signal and second harmonic signal.Signal-processing board 26 pairs of first harmonic signals and second harmonic signal carry out the real time inversion of data acquisition, light intensity correction, signal transacting and ammonia concentration; Cable splice collection simultaneously by being connected to laser receiver system 2 is arranged on temperature value and the force value current signal of the temperature sensor of pipeline 5 inside and 4 ~ 20mA of pressure transducer output, for carrying out the correction of ammonia concentration to the impact of temperature and pressure.The revised ammonia concentration result of inverting sends to LCD display drive plate 27 to show in LCD display 28 by hexadecimal format, finally realizes the in site measurement of pipeline the escaping of ammonia laser absorption spectrum automatic on-line.
Know-why of the present invention:
Ultimate principle of the present invention is based on the absorption of the gas molecule in measuring channel near infrared " fingerprint region " specific absorption line, and namely Beer-Lambert law measures trace gas concentration.It is I that laser instrument sends intensity
0, frequency is the one-wavelength laser of υ, be after the absorbing medium of L by length, in the intensity I of receiving end be:
I(υ)＝I
0(υ)exp(-σ(υ)cL)
Wherein, σ represents absorption cross section, and c represents the concentration of absorbing medium.
In order to improve monitoring sensitivity and the stability of device, wavelength-modulation technique is adopted to realize the real-time online measuring of gas.Its main process is: by superposing low frequency sawtooth signal and high_frequency sine wave signal makes laser output wavelength be scanned across gas center Absorption Line on laser instrument, owing to the light path between diode laser and detector existing the absorption of specific gas molecule, utilize lock-in amplifier to carry out demodulation to detector signal and obtain second harmonic signal I
2fwith first harmonic signal I
1f, the impact brought by the ratio τ elimination light-intensity variation of the two, and utilize τ and absorb the relational implementation of gas concentration to the real time on-line monitoring of pipe interior gas concentration:
Non-elaborated part of the present invention belongs to techniques well known.
The above embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determine.
Claims (10)
1. a pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device, it is characterized in that: this device comprises laser transmitting system, laser receiver system and two welding flange installation units, described laser transmitting system and laser receiver system are fixed on the correlation both sides of pipeline respectively by a welding flange installation unit;
The beam expander collimation lens that described laser transmitting system comprises the first housing, is arranged on the modulation signal generation plate of the first enclosure interior, laser drive power plate and laser instrument and is arranged on the first housing; Described laser receiver system comprises the second housing, is arranged on the detector of the second enclosure interior, pre-amplification circuit plate, lock-in amplifier plate, signal-processing board and display screen drive plate and the beams converge lens installed on the second housing and display screen;
Described modulation signal generation plate is connected with the input end of laser instrument with the output terminal of laser drive power plate, described beam expander collimation lens is arranged on the output light path of laser instrument, modulated laser for exporting laser instrument carries out beam-expanding collimation, forms laser alignment light beam;
Described beams converge lens are used for converging the laser alignment light beam after the gaseous ammonia aspiration receipts to be measured of pipe interior, formed on dot projection to detector and carry out opto-electronic conversion, the output terminal of described detector is connected with the input end of lock-in amplifier plate by pre-amplification circuit plate, the input end of described lock-in amplifier plate is connected with the output terminal of modulation signal generation plate, the described output terminal of lock-in amplifier plate is connected with the input end of signal-processing board, and the output terminal of described signal-processing board is connected with the input end of display screen by display screen drive plate.
2. pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device according to claim 1, it is characterized in that: this device also comprises nitrogen and purges unit, and the gas outlet that described nitrogen purges unit is communicated with the air intake opening of laser transmitting system, laser receiver system and welding flange installation unit respectively by copper pipe;
Described first enclosure interior is also provided with malleation starting protection device and the first power conversion board, described first power conversion board is connected with power supply by malleation starting protection device, for when malleation starting protection device is in closure state, supply voltage is converted to the operating voltage of modulation signal generation plate and laser drive power plate;
Described second enclosure interior is also provided with second source change-over panel, and described second source change-over panel is connected with power supply, for supply voltage being converted to the operating voltage of pre-amplification circuit plate, lock-in amplifier plate, signal-processing board and display screen drive plate.
3. pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device according to claim 1, it is characterized in that: described welding flange installation unit comprises locking clip, the window glass ring of built-in cleaning glass, optical window eyeglass, instrument flange, O type rubber seal, erecting and welding flange, bolt, nut, one-way cock and stainless-steel tube, described locking clip is used for the first housing or the second housing and instrument flange to be fixed together, described window glass ring is arranged on the exit end of laser transmitting system or the incidence end of laser receiver system, described optical window eyeglass is arranged on instrument flange, described instrument flange is fixedly connected with by screw bolt and nut with erecting and welding flange, and adopt O type rubber seal to seal, described erecting and welding flange is fixed on pipeline by stainless-steel tube, described one-way cock is arranged between erecting and welding flange and stainless-steel tube.
4. pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device according to claim 1, it is characterized in that: described pipe interior is provided with temperature sensor and pressure transducer, described temperature sensor is connected with the input end of signal-processing board with the output terminal of pressure transducer.
5. pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device according to claim 1, is characterized in that: described first housing and the second housing are all the box seal casinghousing of the pkt. flap be prepared from by casting aluminium material.
6. pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device according to claim 1, it is characterized in that: described modulation signal generation plate comprises low frequency 30Hz sawtooth signal generating unit and high frequency 10KHz sine wave signal generating unit, described laser drive power plate comprises the temperature controller and current controller that drive laser normally works, and described laser instrument adopts center output wavelength to be the semiconductor laser with tunable of 1.53um.
7. pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device according to claim 1, is characterized in that: the input end of described lock-in amplifier plate is connected by multi-core coaxial shielded cable with the output terminal of modulation signal generation plate.
8. pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device according to claim 2; it is characterized in that: described malleation starting protection device adopts pressure switch; described pressure switch is used for when the first enclosure interior is positive pressure of nitrogen state; remain closed; when the first enclosure interior air pressure is less than or equal to external atmosphere pressure, remain open.
9. pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device according to claim 2, is characterized in that: described power acquisition DC-24V power supply.
10. pipeline the escaping of ammonia laser absorption spectrum automatic on-line in-situ measurement device according to claim 3, is characterized in that: described cleaning glass adopts CaF
2be prepared from, the angle be arranged between the cleaning glass of laser transmitting system exit end and laser receiver system incidence end and laser alignment light beam is 30 degree, and the cleaning glass at two ends is non-parallel mounting structure.
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| CN201510753139.8A CN105259137A (en) | 2015-11-04 | 2015-11-04 | Automatic absorption spectrum online in-situ measuring device for laser ammonia escape of pipeline |
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| CN201510753139.8A CN105259137A (en) | 2015-11-04 | 2015-11-04 | Automatic absorption spectrum online in-situ measuring device for laser ammonia escape of pipeline |
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| CN113820103A (en) * | 2021-09-15 | 2021-12-21 | 中钢安科睿特(武汉)科技有限公司 | Laser absorption amplitude measuring device and measuring method |
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