CN214066929U

CN214066929U - Monitoring system is revealed to methane based on TDLAS technique

Info

Publication number: CN214066929U
Application number: CN202023158898.5U
Authority: CN
Inventors: 崔青山; 姚国斌; 戴晶晶; 赵亚雄; 范明潮; 鲍玮; 张力强; 李鑫
Original assignee: Shanxi Zhongye Internet Energy Co ltd
Current assignee: Shanxi Zhongye Internet Energy Co ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-08-27
Anticipated expiration: 2030-12-24

Abstract

The utility model discloses a methane leakage monitoring system based on TDLAS technique in the technical field of gas detection, CPU and gas detection module electric connection, and CPU's output and wireless data acquisition module electric connection, wireless data acquisition module's output and signal processing module electric connection, data analysis module and laser module electric connection; the utility model realizes the anti-interference, high-precision and quick-response remote methane leakage monitoring; further realizing non-blind area full-coverage, unmanned and accurate leakage detection; the TDLAS-based gas laser telemetering technology has the advantages of large dynamic measurement range, high resolution, good anti-interference performance, no aging of the sensor and no maintenance in daily use, can save direct material cost and maintenance cost caused by frequent sensor replacement compared with the traditional combustion catalysis principle and the electrochemical principle, and can realize intrinsically safe and continuous state monitoring.

Description

Monitoring system is revealed to methane based on TDLAS technique

Technical Field

The utility model relates to a gaseous detection technology field specifically is a monitoring system is revealed to methane based on TDLAS technique.

Background

Methane is an organic compound of the formula CH₄And the molecular weight is 16.043. Methane is the simplest organic and is the least carbon (most hydrogen) hydrocarbon. Methane is widely distributed in nature and is the main component of natural gas, methane, pit gas and the like, commonly called as gas. It can be used as fuel and raw material for preparing hydrogen, carbon black, CO, acetylene, hydrocyanic acid and formaldehyde.

At present, most natural gas pipeline leakage detectors at home and abroad are point-type fixed sensors or portable combustible gas detectors, the detection mode is short-distance detection, the sensors are required to be placed in an environment with possible gas leakage, and the sensors need to be in direct contact with the gas, so that the dangerousness is high; moreover, the sensors conventionally used in industrial fields mostly use electrochemical sensors or combustion catalytic sensors in principle, and problems such as sensor aging, same type of gas interference false alarm, frequent maintenance and the like are encountered in practical use. In addition, in the manual actual inspection process, situations that direct detection conditions are difficult to meet such as overhead pipelines, river channel crossing pipelines, buried pipelines and the like are often encountered; therefore, a methane leakage monitoring system based on the TDLAS technology is provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a monitoring system is revealed to methane based on TDLAS technique to solve the problem of proposing in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a monitoring system is revealed to methane based on TDLAS technique, includes CPU, CPU and gaseous detection module electric connection, just CPU's output and wireless data acquisition module electric connection, wireless data acquisition module's output and signal processing module electric connection, signal processing module's output data acquisition gateway electric connection, data acquisition gateway and cloud platform electric connection, cloud platform and methane laser telemetering terminal electric connection, CPU's output and data analysis module electric connection, data analysis module and laser module electric connection, data analysis module and data storage module electric connection.

Further, the laser module comprises laser emission module and laser receiving module, just the laser module is located the air chamber inner chamber, the air chamber inner chamber is equipped with photoelectric sensor.

Furthermore, the emitting end of the laser module is provided with a multi-path light splitter, the inner cavity of the air chamber is provided with a photoelectric conversion circuit, and the output end of the photoelectric conversion circuit is electrically connected with the alarm display module through an amplifying circuit.

Furthermore, the alarm display module is composed of an alarm module and a digital display module, and the alarm module is realized by adopting an LCD digital display tube and a general audible and visual alarm.

Furthermore, the laser module is connected with a collimator through an optical fiber, the collimator is communicated with the air chamber, and the laser emitting module is a DFB laser.

Further, the holder is a horizontal 0-360 degrees, and a vertical +/-60 degrees full-motion holder.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model realizes the anti-interference, high-precision and quick-response remote methane leakage monitoring; the cloud platform is carried in combination with the 4G wireless data acquisition gateway, and in high-risk places with natural gas leakage risks, such as natural gas stations and LNG factories, non-blind-area full-coverage, unmanned and accurate leakage detection is further realized. By using a battery power supply mode, flexible and portable mobile monitoring can be realized; the TDLAS-based gas laser telemetering technology has the advantages of large dynamic measurement range, high resolution, good anti-interference performance, no aging of the sensor and no maintenance in daily use, can save direct material cost and maintenance cost caused by frequent sensor replacement compared with the traditional combustion catalysis principle and the electrochemical principle, and can realize intrinsically safe and continuous state monitoring.

Drawings

Fig. 1 is a block diagram of the working principle of the present invention.

In the figure: 1. a CPU; 2. a gas detection module; 3. a wireless data acquisition module; 4. a signal processing module; 5. a data acquisition gateway; 6. a holder; 7. a methane laser telemetering terminal; 8. a data analysis module; 9. a data storage module; 10. a laser emission module; 11. a laser receiving module; 12. a multi-path optical splitter; 13. an air chamber; 14. a photosensor; 15. a digital display module; 16. and an alarm module.

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Please refer to fig. 1, the utility model provides a monitoring system is revealed to methane based on TDLAS technique, including CPU1, CPU1 and 2 electric connection of gaseous detection module, and CPU 1's output and 3 electric connection of wireless data acquisition module, wireless data acquisition module 3's output and 4 electric connection of signal processing module, 5 electric connection of signal processing module 4's output data acquisition gateway, data acquisition gateway 5 and 6 electric connection of cloud platform, combine 4G wireless data acquisition gateway to carry on the cloud platform, at the natural gas station, there is the high-risk place of natural gas leakage risk in LNG mill etc. further realize no blind area total covering, unmanned, accurate leak detection. The battery power supply mode is used, flexible and portable mobile monitoring can be realized, and the holder 6 is electrically connected with the methane laser telemetering terminal 7;

the output end of the CPU1 is electrically connected with the data analysis module 8, the data analysis module 8 is electrically connected with the laser module, the data analysis module 8 is electrically connected with the data storage module 9, a single-frequency narrow-band laser is used for scanning an independent gas absorption line, the characteristic that the wavelength of the tunable semiconductor laser changes along with the injection current is utilized, the measurement of a single or a plurality of absorption lines of molecules which are very close to each other and difficult to distinguish is realized, and the advantages of high speed and high sensitivity are realized. Without desensitization, the time resolution can be in the order of milliseconds. The laser has high resolution and high detection precision, so that the laser can be used for trace gas monitoring and analysis.

The laser module is composed of a laser emitting module 10 and a laser receiving module 11, the laser module is arranged in an inner cavity of an air chamber 13, a photoelectric sensor 14 is arranged in the inner cavity of the air chamber 13, current modulation is carried out on the laser module through a single-chip microcomputer control circuit, laser with required wavelength is emitted by the laser module, the laser passes through an air monitoring area and then reaches a reflecting surface and is reflected back to a laser detector, if detected characteristic gas exists in the air area through which the laser passes, the laser can act on the gas and be absorbed, the higher the concentration of the characteristic gas is, the larger the absorption amount is, the laser detector can monitor the change of the laser intensity and feed the change back the change to the single-chip microcomputer control circuit for processing, and finally a concentration result is transmitted to a wireless data acquisition module through a signal processing module and finally uploaded to a data center.

The emitting end of the laser module is provided with a multi-path light splitter 12, the inner cavity of the air chamber 13 is provided with a photoelectric conversion circuit, and the output end of the photoelectric conversion circuit is electrically connected with the alarm display module through an amplifying circuit.

The alarm display module is composed of an alarm module 16 and a digital display module 15, and the alarm module 16 is realized by adopting an LCD digital display tube and a general audible and visual alarm.

The laser module is connected with a collimator through an optical fiber, the collimator is communicated with the air chamber 13, and the laser emitting module 10 is a DFB laser.

The holder 6 is a horizontal 0-360 DEG, vertical +/-60 DEG all-movable holder, N areas to be monitored or planned detection paths are preset, and detection time is preset, so that blind-spot-free full-coverage and unmanned accurate detection of methane leakage detection in high-risk places with natural gas leakage risks, such as natural gas stations, LNG factories and the like, is realized.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a monitoring system is revealed to methane based on TDLAS technique which characterized in that: including CPU (1), CPU (1) and gaseous detection module (2) electric connection, just the output and the wireless data acquisition module (3) electric connection of CPU (1), the output and signal processing module (4) electric connection of wireless data acquisition module (3), the output data acquisition gateway (5) electric connection of signal processing module (4), data acquisition gateway (5) and cloud platform (6) electric connection, cloud platform (6) and methane laser telemetering measurement terminal (7) electric connection, the output and data analysis module (8) electric connection of CPU (1), data analysis module (8) and laser module electric connection, data analysis module (8) and data storage module (9) electric connection.

2. The TDLAS technology based methane leak monitoring system of claim 1, wherein: the laser module comprises laser emission module (10) and laser receiving module (11), just the laser module is located air chamber (13) inner chamber, air chamber (13) inner chamber is equipped with photoelectric sensor (14).

3. The TDLAS technology based methane leak monitoring system of claim 2, wherein: the emitting end of the laser module is provided with a multi-path light splitter (12), the inner cavity of the air chamber (13) is provided with a photoelectric conversion circuit, and the output end of the photoelectric conversion circuit is electrically connected with the alarm display module through an amplifying circuit.

4. The TDLAS technology based methane leak monitoring system of claim 3, wherein: the alarm display module is composed of an alarm module (16) and a digital display module (15), and the alarm module (16) is realized by adopting an LCD digital display tube and a general audible and visual alarm.

5. The TDLAS technology based methane leak monitoring system of claim 4, wherein: the laser module is connected with a collimator through an optical fiber, the collimator is communicated with the air chamber (13), and the laser emitting module (10) is a DFB laser.

6. The TDLAS technology based methane leak monitoring system of claim 1, wherein: the holder (6) is a horizontal 0-360 DEG, vertical +/-60 DEG all-moving holder.