CN108443001B - Ammonia concentration distribution testing arrangement - Google Patents

Ammonia concentration distribution testing arrangement Download PDF

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Publication number
CN108443001B
CN108443001B CN201810137671.0A CN201810137671A CN108443001B CN 108443001 B CN108443001 B CN 108443001B CN 201810137671 A CN201810137671 A CN 201810137671A CN 108443001 B CN108443001 B CN 108443001B
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glass block
laser
quartz glass
flange
circular
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CN108443001A (en
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尹必峰
俞升浩
文帅
贾和坤
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Jiangsu Tianhai Special Equipment Co ltd
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Jiangsu University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1818—Concentration of the reducing agent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention provides an ammonia concentration distribution testing device which comprises an image pickup device, a controller, a laser, a first glass block, a round pipe, a second glass block and an air guide pipe, wherein the image pickup device is used for picking up an image of an object to be tested; the first glass block is arranged at one end of the round pipe and is provided with a through hole communicated with one end of the round pipe; the second glass block is arranged at the other end of the round pipe; the air duct is connected with the circular tube exhaust port; the laser and the first glass block are positioned in the same plane, and laser emitted by the laser enters the round tube through the first glass block; the image pickup device is arranged on the same axis with the first glass block and the second glass block and is parallel to the first glass block and the second glass block, and a fluorescence image generated by the ammonia gas under the action of laser is obtained; the laser and the controller are respectively connected with the controller. The system device can simultaneously realize the visualization and quantitative test of the ammonia concentration distribution on the whole cross section of the front end of the SCR system catalyst, has the advantages of high measurement precision and comprehensive test range, and provides guiding effect for the optimization design of the SCR system and the exhaust pipeline.

Description

Ammonia concentration distribution testing arrangement
Technical Field
The invention belongs to the technical field of internal combustion engine testing, and mainly relates to an ammonia gas concentration distribution testing device; the concentration distribution on the whole cross section can be comprehensively measured by aiming at the ammonia concentration distribution test at the front end of the catalyst of the diesel engine post-treatment SCR system.
Background
The SCR post-treatment technology is a key post-treatment technology for reducing NOx of a diesel engine, and the working principle of the SCR post-treatment technology is to spray urea aqueous solution into tail gas of an exhaust pipe to provide a reducing agent ammonia gas and simultaneously to NO in the exhaust gasxReaction for reducing NOx. Wherein the atomized decomposition of the urea aqueous solution and the subsequent mixing with the exhaust gas have a crucial influence on the SCR performance, in particular the uniformity of the ammonia concentration distribution of the urea aqueous solution atomized decomposition products at the cross-section at the SCR inlet directly affects the NOxThe conversion efficiency of the SCR catalyst is especially important for optimizing an SCR system and reducing emission of a diesel engine by testing the ammonia concentration distribution at the front end of the SCR catalyst.
At present, the ammonia concentration distribution test of the SCR system generally adopts a point test method because the ammonia concentration distribution test is a gas phase, the concentration of the point is obtained by collecting gas phase substances flowing through the point and utilizing Fourier infrared spectrum FTIR analysis, the test range is not comprehensive enough, the point distribution process is complicated and transient data cannot be obtained, and no test device capable of comprehensively and accurately reflecting the concentration distribution on the whole section exists.
Disclosure of Invention
The invention aims to provide an ammonia gas concentration distribution testing device aiming at the problems. The method is mainly used for visualizing the ammonia concentration distribution on the whole front section of the SCR catalyst in the diesel engine tail gas aftertreatment process, quantitatively measures and analyzes the ammonia concentration distribution and uniformity on the section through an image processing process, and provides a basis for optimizing an SCR urea injection system and an exhaust pipeline.
The technical scheme of the invention is as follows: an ammonia concentration distribution testing device comprises an image shooting device, a controller, a laser, a first glass block, a round tube, a second glass block and an air guide tube;
the first glass block is arranged at one end of the round pipe and is provided with a through hole communicated with one end of the round pipe; the second glass block is arranged at the other end of the round pipe; the air guide pipe is connected with the circular pipe exhaust port; the laser and the first glass block are positioned in the same plane, and laser emitted by the laser enters the round tube through the first glass block; the image pickup device is arranged on the same axis with the first glass block and the second glass block and is parallel to the first glass block and the second glass block, and a fluorescence image generated by the ammonia gas under the action of laser is obtained; the laser and the image shooting device are respectively connected with the controller.
In the scheme, the laser emitted by the laser is a monochromatic parallel beam, the wavelength range is 50 nm-900 nm, the monochromatic parallel beam is emitted from one side surface perpendicular to the square quartz glass and is perpendicular to the axis of the circular tube, and the laser width is larger than or equal to the inner diameter of the circular tube.
In the scheme, the first glass block is square quartz glass, the square quartz glass is arranged at one end of the circular tube through the first flange 1, and the square quartz glass is positioned between one end of the circular tube and the first flange and is parallel to the first flange; a square hole is formed in the middle of the square quartz glass, and the side length of the square hole is consistent with the inner diameter of the circular tube.
In the above scheme, the second glass block is a circular quartz glass window, and the circular quartz glass window is mounted at the other end of the circular tube through a second flange; and the circular quartz glass window is positioned between the other end of the circular tube and the second flange and is parallel to the second flange, and the diameter of the circular quartz glass window is larger than the inner diameter of the circular tube.
In the scheme, the inner diameter of the first flange is equal to the outer diameter of one end, close to the circular pipe, of the exhaust pipe, through holes are formed in the circumferential direction of the first flange, and the number of the through holes is not less than 4; the inner diameter of the second flange is larger than the inner diameter of the circular pipe and smaller than the diameter of the circular quartz glass window, through holes are formed in the circumferential direction of the second flange, and the number of the through holes is not smaller than 4.
In the scheme, annular high-temperature-resistant sealing gaskets are respectively arranged between one end of the circular tube and the square quartz glass, between the square quartz glass and the first flange, between the other end of the circular tube and the circular quartz glass window, and between the circular quartz glass window and the second flange, and the inner diameter of each annular high-temperature-resistant sealing gasket is larger than the inner diameter of the circular tube.
In the scheme, the inner diameter of the circular pipe is equal to the inner diameter of the section of the exhaust pipe required to be measured, and the length of the circular pipe is 4 times of the length of the inner diameter of the circular pipe.
In the scheme, the exhaust port is arranged on the pipe wall of one end, close to the round quartz glass window, of the round pipe.
In the scheme, the air duct is internally provided with a flow control valve.
In the above scheme, the controller comprises a synchronous control module, a data acquisition module, a storage module and an image processing module; the synchronous control module is used for receiving input related test parameters; the data acquisition module is connected with the image shooting device and is used for acquiring the information data of the spray image on the section of the square quartz glass; the storage module is used for storing the image information data into a memory; the image processing module is used for processing the image.
Compared with the prior art, the invention has the beneficial effects that: the invention can comprehensively measure the ammonia concentration distribution visualization and quantitative test on the inner section of the exhaust pipe under the actual engine operation condition in real time, obtains the concentration distribution uniformity by analysis, has high measurement precision, comprehensive measurement data and convenient operation, can realize transient measurement, and provides guidance for the optimization design of the SCR system and the exhaust pipeline.
Drawings
FIG. 1 is a schematic view of an ammonia gas concentration distribution testing apparatus according to the present invention.
Fig. 2 is a schematic structural view of the first flange.
Fig. 3 is a schematic structural view of a second flange.
FIG. 4 is a schematic view of the connection between the tube and the airway tube.
In the figure, 1, a first flange; 2. square quartz glass; 3. a circular tube; 4. a circular quartz glass window; 5. a second flange; 6. an annular high temperature resistant sealing gasket; 7 digital CCD camera; 8. a laser; 9. a controller; 10. a bolt; 11. a nut; 12. an SCR urea injection system; 13. an exhaust pipe; 14. an air duct; 15. a diesel engine; 16. a flow control valve.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and detailed description, but the scope of the present invention is not limited thereto.
As shown in fig. 1, the preferred embodiment of the present invention mainly includes an image pickup device, a controller 9, a laser 8, a first glass block, a circular tube 3, a second glass block, and an air guide tube 14.
The first glass block is arranged at one end of the circular tube 3, and is provided with a through hole communicated with one end of the circular tube 3; the second glass block is arranged at the other end of the round tube 3; the air duct 14 is connected with an air outlet of the round tube 3; the laser 8 and the first glass block are positioned in the same plane, and laser emitted by the laser 8 enters the circular tube 3 through the first glass block; the image pickup device is arranged on the same axis with the first glass block and the second glass block and is parallel to the first glass block and the second glass block, and a fluorescence image generated by the ammonia gas under the action of laser is obtained; the laser 8 and the image pickup device are respectively connected with a controller 9.
Preferably, the image pickup device is a digital CCD camera 7. The first glass block is square quartz glass 2; the second glass block is a circular quartz glass window 4.
One end of the circular tube 3 is connected with one end of an exhaust pipe 13 with an SCR urea injection system 12, the first glass block is positioned between the circular tube 3 and the exhaust pipe 13, and gas in the exhaust pipe 13 enters the circular tube 3 through a through hole of the first glass block.
A diesel engine 15 is connected to the other end of the exhaust pipe 13 to provide real engine operating conditions and a spray of aqueous urea solution capable of generating ammonia is provided by the SCR urea injection system 12. And cutting the exhaust pipe 13 at the front end face of the SCR catalyst to obtain a section of ammonia concentration distribution to be measured, and welding the first flange 1 at the tail end of the exhaust pipe 13.
The laser emitted by the laser 8 is a monochromatic parallel beam with the wavelength ranging from 50nm to 900nm, the monochromatic parallel beam is emitted from one side surface perpendicular to the square quartz glass 2 and is perpendicular to the axis of the circular tube 3, and the laser width is larger than or equal to the inner diameter of the circular tube 3.
The square quartz glass 2 is positioned between one end of the circular tube 3 and the first flange 1 and is parallel to the first flange 1; the inner diameter of the first flange 1 is equal to the outer diameter of one end of the exhaust pipe 13 close to the circular pipe 3, through holes are formed in the circumferential direction of the first flange 1, and the number of the through holes is not less than 4; a square hole is formed in the middle of the square quartz glass 2, and the side length of the square hole is consistent with the inner diameter of the circular tube 3.
The round quartz glass window 4 is positioned right in the middle of the other end of the round tube 3 and the second flange 5 and is parallel to each other, and the diameter of the round quartz glass window 4 is larger than the inner diameter of the round tube 3; the inner diameter of the second flange 5 is larger than the inner diameter of the circular tube 3 and smaller than the diameter of the circular quartz glass window 4, through holes are formed in the circumferential direction of the second flange 5, and the number of the through holes is not smaller than 4.
The circular tube 3 can resist high temperature, the highest temperature is 600-700 ℃, the inner diameter of the circular tube 3 is the inner diameter of the section needing to be measured of the exhaust pipe 13, the length of the circular tube 3 is 4 times of the inner diameter of the circular tube 3, and an exhaust port is arranged on the tube wall close to one end of the circular quartz glass window 4; a flange is processed at one end of the round tube 3 close to the square quartz glass 2, and a through hole with the diameter and the position consistent with those of the through hole on the first flange 1 is formed in the flange; the bolt 10 and the nut 11 connect the first flange 1 and one end of the circular tube 3 through a through hole, and clamp and fix the square quartz glass 2 in the middle. A flange is processed at one end of the circular tube 3 close to the circular quartz glass window 4, and a through hole with the diameter and the position consistent with those of the through hole on the second flange 5 is formed in the flange; the bolt 10 and the nut 11 connect the second flange 5 and the other end of the circular tube 3 through a through hole and clamp and fix the middle circular quartz glass window 4.
Annular high-temperature-resistant sealing gaskets 6 are respectively arranged between one end of the circular tube 3 and the square quartz glass 2, between the square quartz glass 2 and the first flange 1, between the other end of the circular tube 3 and the circular quartz glass window 4, and between the circular quartz glass window 4 and the second flange 5, and the inner diameter of each annular high-temperature-resistant sealing gasket 6 is larger than that of the circular tube 3.
As shown in fig. 1 and 2, an annular refractory gasket 6, a square quartz glass 2, and an annular refractory gasket 6 are respectively placed between the first flange 1 and one end of the circular tube 3 so that their centers are on the same axis. The first flange 1 and the circular tube 3 are connected by corresponding through holes on the first flange 1 and the circular tube 3 one end flange using bolts and nuts, while clamping the fixed ring-shaped high temperature gasket 6 and the square quartz glass 2.
As shown in fig. 1 and 3, an annular refractory gasket 6, a circular quartz glass window 4, and an annular refractory gasket 6 are respectively disposed between the second flange 5 and the other end of the cylindrical tube 3 so that their centers are on the same axis. The second flange 5 and the circular tube 3 are connected by corresponding through holes on the second flange 5 and the flange at the other end of the circular tube 3 using bolts and nuts while clamping the fixed ring-shaped high temperature gasket 6 and the circular quartz glass window 4.
As shown in fig. 4, one end of the air duct 14 is connected with the circular tube 3 through an air outlet, in this example, the air duct 14 is connected by welding, the inner diameter of the air duct 14 is larger than or equal to the diameter of the air outlet, and a flow control valve 16 is installed at the other end of the air duct 14 to provide a certain back pressure by the opening degree thereof.
In this example, bnc lines are used to connect the nozzles in the SCR urea injection system 12 to the controller 9 so that the controller 9 can control the opening timing and injection pulse width of the nozzles. The bnc line is used to connect the laser 8 to the controller 9 so that the controller 9 can control the timing and frequency of the laser light being turned on. Bnc is adopted to connect the digital CCD camera 7 and the controller 9, so that the controller 9 can adjust parameters of the digital CCD camera 7, such as shooting time, frequency, exposure time and the like.
The controller 9 comprises a synchronous control module, a data acquisition module, a storage module and an image processing module; the synchronous control module is used for receiving relevant test parameters input by a keyboard; the data acquisition module is used for acquiring the information data of the spray image on the section of the square quartz glass 2; the storage module is used for storing the image information into a corresponding data file of the memory; the image processing module is used for editing and processing the size and the tone of an image.
And adjusting the positions of the laser 8 and the digital CCD camera 7. The parallel light beam emitted by the laser 8 is perpendicular to one side surface of the square quartz glass 2 and is also perpendicular to the axis of the round tube 3, and the width of the parallel light beam is adjusted to be not less than the diameter of the shooting section, namely the whole section of the front end of the SCR catalyst can be covered. The digital CCD camera 7 is arranged on the same axis with the circular quartz glass window 4 and the lens is parallel to the circular quartz glass window 4; adjusting the focal length of the digital CCD camera 7 to obtain a clear enough picture at the measured section; an optical filter is arranged in front of the lens of the digital CCD camera 7, so that the interference of Rayleigh scattered light, Mie scattered light and other stray light generated by irradiating the ammonia molecules with laser can be effectively inhibited, and the effective measurement of the fluorescence signal of the ammonia molecules can be ensured.
Collecting ammonia concentration distribution images of the cross section: adjusting the diesel engine to a stable working condition, and setting parameters such as urea aqueous solution injection frequency, injection pulse width, laser emission frequency, laser intensity, image acquisition frequency, acquisition time, shooting speed, exposure rate and the like through a synchronous control module of a controller 9; in this example, the urea aqueous solution injection frequency was set to 10Hz and the injection pulse width was set to 5 ms; the laser emission frequency is 10Hz, the pulse width is 10ns, and the laser intensity is 400; the image acquisition frequency, namely the shooting frequency of the digital CCD camera 7 is 10Hz, and the exposure time is 500 mus; meanwhile, the delay among the urea injection, the laser emission and the shooting time of the digital CCD camera 7 can be adjusted through the synchronous control module, so that the shooting can be realized, and the set delay is 0s in the example.
After the parameters are set, the operation is started, when the SCR urea injection system 12 operates to a specific time, the laser 8 flickers, based on the plane laser induced fluorescence principle, the laser emits laser with a certain wavelength to irradiate ammonia molecules to generate fluorescence, and meanwhile, the digital CCD camera 7 captures fluorescence signals on the section of the square quartz glass 2 and stores the fluorescence signals as pictures, so that the image information acquisition is completed and the pictures are transmitted to the data acquisition module of the computer image acquisition and processing system 9; the data acquisition module stores the image information in the storage module, and the distribution of fluorescence on the image is the distribution of the ammonia concentration of the whole section, namely the visualization of the ammonia concentration distribution of the whole section.
After the test is finished, the computer and the calibrated data stored in the computer are utilized to carry out image processing and analysis through the image processing module, the calibrated data are ammonia concentration data corresponding to different fluorescence signal intensities under different temperature and pressure conditions, and therefore, the ammonia concentration at any point of the section can be obtained according to the fluorescence signal intensity on the shot picture, and quantitative measurement is realized.
Therefore, the problem that the patent solves is to comprehensively and accurately measure the ammonia concentration distribution of the front-end section of the SCR system catalyst in the exhaust pipe under the actual engine running condition.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (9)

1. The ammonia gas concentration distribution testing device is characterized by comprising an image pickup device, a controller (9), a laser (8), a first glass block, a round tube (3), a second glass block and an air guide tube (14);
the first glass block is arranged at one end of the round pipe (3), and is provided with a through hole communicated with one end of the round pipe (3); the second glass block is arranged at the other end of the round pipe (3); the air duct (14) is connected with an air outlet of the round tube (3); the laser (8) and the first glass block are positioned in the same plane, and laser emitted by the laser (8) enters the circular tube (3) through the first glass block; the image pickup device is arranged on the same axis with the first glass block and the second glass block and is parallel to the first glass block and the second glass block, and a fluorescence image generated by the ammonia gas under the action of laser is obtained; the laser (8) and the image shooting device are respectively connected with a controller (9); the controller (9) comprises a synchronous control module, a data acquisition module, a storage module and an image processing module; the synchronous control module is used for receiving input test parameters; the data acquisition module is connected with the image shooting device and used for acquiring the spray image information data on the section of the first glass block; the storage module is used for storing the image information data into a memory; the image processing module is used for processing the image according to calibrated data, the calibrated data are ammonia concentration data corresponding to different fluorescence signal intensities, and the ammonia concentration at any point of the section can be obtained according to the fluorescence signal intensity on the image information data.
2. The ammonia concentration distribution testing device according to claim 1, characterized in that the laser emitted by the laser (8) is a monochromatic parallel beam with a wavelength ranging from 50nm to 900nm, the monochromatic parallel beam is emitted from one side surface perpendicular to the square quartz glass (2) and is perpendicular to the axis of the round tube (3), and the laser width is larger than or equal to the inner diameter of the round tube (3).
3. The ammonia concentration distribution testing device according to claim 1, wherein the first glass block is a square quartz glass (2), the square quartz glass (2) is installed at one end of the circular tube (3) through a first flange (1), and the square quartz glass (2) is located between one end of the circular tube (3) and the first flange (1) and is parallel to each other; the right middle of the square quartz glass (2) is provided with a square hole.
4. The ammonia concentration distribution testing device according to claim 3, wherein the second glass block is a circular quartz glass window (4), and the circular quartz glass window (4) is installed at the other end of the circular tube (3) through a second flange (5); and the round quartz glass window (4) is positioned between the other end of the round tube (3) and the second flange (5) and is parallel to each other, and the diameter of the round quartz glass window (4) is larger than the inner diameter of the round tube (3).
5. The ammonia concentration distribution testing device according to claim 4, characterized in that the inner diameter of the first flange (1) is equal to the outer diameter of one end of the exhaust pipe (13) close to the circular pipe (3), the first flange (1) is circumferentially provided with through holes, and the number of the through holes is not less than 4; the inner diameter of the second flange (5) is larger than that of the round pipe (3) and smaller than the diameter of the round quartz glass window (4), through holes are formed in the circumferential direction of the second flange (5), and the number of the through holes is not smaller than 4.
6. The ammonia concentration distribution testing device according to claim 4, wherein annular high temperature resistant sealing gaskets (6) are respectively arranged between one end of the circular tube (3) and the square quartz glass (2), between the square quartz glass (2) and the first flange (1), between the other end of the circular tube (3) and the circular quartz glass window (4), and between the circular quartz glass window (4) and the second flange (5).
7. The ammonia gas concentration distribution testing device according to claim 1, wherein the inner diameter of the circular tube (3) is equal to the inner diameter of the exhaust pipe (13) at the position of the section to be measured, and the length of the circular tube (3) is 4 times the length of the inner diameter of the circular tube (3).
8. The ammonia gas concentration distribution testing device according to claim 1, wherein the exhaust port is arranged on the wall of the circular tube (3) near one end of the circular quartz glass window (4).
9. The ammonia gas concentration distribution testing device according to claim 1, characterized in that a flow control valve (16) is installed in the air duct (14).
CN201810137671.0A 2018-02-10 2018-02-10 Ammonia concentration distribution testing arrangement Active CN108443001B (en)

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Publication number Priority date Publication date Assignee Title
CN109252929B (en) * 2018-11-16 2024-06-07 上海歌地催化剂有限公司 Auxiliary detection equipment for testing ammonia uniformity and testing method thereof
CN111551539A (en) * 2020-05-21 2020-08-18 天津大学 Device and method for measuring ammonia gas based on femtosecond laser induced plasma
CN112525842B (en) * 2020-12-25 2023-07-18 江苏师范大学 Real-time detection device for ammonia gas concentration distribution in automobile exhaust based on flat-top laser beam
CN114000937B (en) * 2021-10-29 2023-03-24 潍柴动力股份有限公司 Automatic recognition cleaning device for urea crystallization and control method thereof

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US6406669B1 (en) * 2001-01-12 2002-06-18 The Regents Of The University Of California Polyaniline-based optical ammonia detector
CN103109172A (en) * 2010-06-24 2013-05-15 三菱重工业株式会社 Ammonia compound concentration measuring device and ammonia compound concentration measuring method
CN103674911A (en) * 2013-12-02 2014-03-26 中国科学院安徽光学精密机械研究所 Fluorescent pool for atmosphere Hox free radical real-time measurement
CN103760142A (en) * 2014-01-14 2014-04-30 中国科学院工程热物理研究所 Optical measuring method and device for spatial distribution of liquid droplets of fuel nozzle
CN107271365A (en) * 2017-08-23 2017-10-20 华纳创新（北京）科技有限公司 A kind of device of on-line determination the escaping of ammonia in situ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6406669B1 (en) * 2001-01-12 2002-06-18 The Regents Of The University Of California Polyaniline-based optical ammonia detector
CN103109172A (en) * 2010-06-24 2013-05-15 三菱重工业株式会社 Ammonia compound concentration measuring device and ammonia compound concentration measuring method
CN103674911A (en) * 2013-12-02 2014-03-26 中国科学院安徽光学精密机械研究所 Fluorescent pool for atmosphere Hox free radical real-time measurement
CN103760142A (en) * 2014-01-14 2014-04-30 中国科学院工程热物理研究所 Optical measuring method and device for spatial distribution of liquid droplets of fuel nozzle
CN107271365A (en) * 2017-08-23 2017-10-20 华纳创新（北京）科技有限公司 A kind of device of on-line determination the escaping of ammonia in situ

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