CN-121994728-A - Multicomponent gas concentration monitoring system and method

CN121994728ACN 121994728 ACN121994728 ACN 121994728ACN-121994728-A

Abstract

The invention provides a multi-component gas concentration monitoring system and method, wherein the system comprises a laser light source module, a light pulse module, a gas chamber type passive sensor, a photoelectric conversion module and an industrial personal computer module, wherein the light pulse module is used for pulsing laser output by the laser light source module and then transmitting the laser to the gas chamber type passive sensor, the gas chamber type passive sensor comprises a gas chamber, a first collimator, a second collimator and a reflecting mirror, the reflecting mirror is used for reflecting outgoing light which enters the gas chamber from an entrance opening and then exits from an exit opening to the entrance opening, the first collimator is used for converting divergent light which enters the gas chamber from the entrance opening into parallel light and then exits from the exit opening, and the second collimator is used for converting light which enters the gas chamber from the exit opening into parallel light and then exits from the entrance opening. The invention can monitor the concentration of the gas to be detected in the multi-component gas and realize the aim of safely monitoring the storage tank.

Inventors

WANG FEI
FANG ZHENGQI
WANG XINGDONG
MA HONGJUN
LIN XIAOHUI
LIU XIWEN
LI YU
GUO GE
LI YONGSHENG
ZHANG LEI
ZHANG XIN

Assignees

中国石油管道局工程有限公司
中国石油天然气集团有限公司
中国石油天然气管道通信电力工程有限公司
中国石油天然气管道工程有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (10)

1. The multi-component gas concentration monitoring system is characterized by comprising a laser light source module, an optical pulse module, a gas chamber type passive sensor, a photoelectric conversion module and an industrial personal computer module; The optical pulse module transmits laser output by the laser light source module to the air chamber type passive sensor after pulsing; the gas chamber type passive sensor comprises a gas chamber, a first collimator, a second collimator and a reflecting mirror, wherein the gas chamber is a cavity body comprising an entrance port and an exit port, the gas chamber is used for containing multi-component gas to be monitored, the reflecting mirror is used for reflecting outgoing light which enters the gas chamber from the entrance port and then exits from the exit port to the entrance port for exiting, the first collimator is arranged at the entrance port of the gas chamber, the second collimator is arranged at the exit port of the gas chamber, the first collimator is used for converting divergent light beams which enter the gas chamber from the entrance port into parallel light beams to exit from the exit port, and the second collimator is used for converting divergent light beams which enter the gas chamber from the exit port into parallel light beams to exit from the entrance port; When pulsed laser is injected into the air chamber from the first collimator of the injection port, absorbed by the multi-component gas to be monitored, and then is injected from the second collimator of the emission port, reflected by the reflecting mirror, injected from the second collimator of the emission port of the air chamber, then injected from the first collimator of the injection port, the photoelectric conversion module detects the light signal emitted from the first collimator of the injection port, performs photoelectric conversion, and then transmits the light intensity peak value of the pulse laser signal absorbed by the multi-component gas to the industrial personal computer module, and the industrial personal computer module calculates to obtain the concentration of the gas to be monitored in the multi-component gas according to the light intensity peak value of the pulse laser signal.
2. The system of claim 1, wherein the calculating the concentration of the gas to be monitored in the multi-component gas comprises: calibrating the absorption coefficient of the gas to be measured on the pulse laser in advance through a multi-component gas concentration monitoring system; And calculating to obtain the concentration of the gas to be detected in the multi-component gas to be monitored according to the absorption coefficient and the light intensity peak value of the pulse laser signal.
3. The system of claim 1, wherein when the laser light source module employs lasers of multiple wavelengths, the system further comprises a first coupler for coupling the laser light of different wavelengths pulsed by the light pulse module and transmitting the coupled laser light to the gas cell.
4. The system of claim 3, further comprising a second coupler that transmits incident light to the plenum when the second coupler receives the incident light from the first coupler, and transmits reflected light to the photoelectric conversion module when the second coupler receives the reflected light from the plenum.
5. The system of claim 4, wherein when there are N plenums, the system further comprises a third coupler that equally splits incident light from the second coupler into N shares for transmission into each plenum, where N is a positive integer greater than 1.
6. The system of claim 1, further comprising a delay fiber coupled to the output of each laser for temporally differentiating between the different wavelengths of laser light.
7. The system of claim 1, wherein the air chamber type passive sensor is in optical signal transmission with the laser light source module and the photoelectric conversion module by adopting single-core optical fibers.
8. The system of claim 1, further comprising a display screen coupled to the industrial personal computer module for displaying the concentration of the multi-component gas to be monitored.
9. The system of claim 1, further comprising a speaker coupled to the industrial personal computer module for alerting when the concentration of the multicomponent gas to be monitored exceeds a set threshold.
10. A multi-component gas concentration monitoring method, which is implemented based on the multi-component gas concentration monitoring system according to any one of claims 1 to 9, characterized by comprising: collecting the light intensity peak value of the pulse laser signal absorbed by the multicomponent gas to be monitored; and calculating according to the light intensity peak value of the pulse laser signal to obtain the concentration of the gas to be detected in the multi-component gas to be monitored.

Description

Multicomponent gas concentration monitoring system and method Technical Field The invention relates to the technical field of gas concentration monitoring, in particular to a multi-component gas concentration monitoring system and method. Background In the petroleum exploitation, transportation and refining processes, a large amount of combustible gas and harmful gas mainly comprise methane, ethane, propane, butane, hydrogen sulfide and the like, and it is important to monitor the concentration of the oil gas, and if the concentration of the oil gas exceeds a certain range, a flammable and explosive gas mixture can be formed. Therefore, it is necessary to monitor the concentration of the multi-component gas in the tank. The current means for monitoring the oil gas concentration mainly comprise a fixed gas monitor, an infrared spectrum technology, a photoelectrochemical sensor and the like, and the means have the problems of active sensor, low monitoring precision, high monomer cost and the like. Disclosure of Invention Aiming at the problems in the prior art, the embodiment of the invention provides a multi-component gas concentration monitoring system and a multi-component gas concentration monitoring method, which can realize long-term, real-time and continuous multi-component gas concentration monitoring so as to ensure production and transportation safety. In one embodiment, the invention provides a multicomponent gas concentration monitoring system, which comprises a laser light source module, a light pulse module, a gas chamber type passive sensor, a photoelectric conversion module and an industrial personal computer module; The optical pulse module transmits laser output by the laser light source module to the air chamber type passive sensor after pulsing; the gas chamber type passive sensor comprises a gas chamber, a first collimator, a second collimator and a reflecting mirror, wherein the gas chamber is a cavity body comprising an entrance port and an exit port, the gas chamber is used for containing multi-component gas to be monitored, the reflecting mirror is used for reflecting outgoing light which enters the gas chamber from the entrance port and then exits from the exit port to the entrance port for exiting, the first collimator is arranged at the entrance port of the gas chamber, the second collimator is arranged at the exit port of the gas chamber, the first collimator is used for converting divergent light beams which enter the gas chamber from the entrance port into parallel light beams to exit from the exit port, and the second collimator is used for converting divergent light beams which enter the gas chamber from the exit port into parallel light beams to exit from the entrance port; When pulsed laser is injected into the air chamber from the first collimator of the injection port, absorbed by the multi-component gas to be monitored, and then is injected from the second collimator of the emission port, reflected by the reflecting mirror, injected from the second collimator of the emission port of the air chamber, then injected from the first collimator of the injection port, the photoelectric conversion module detects the light signal emitted from the first collimator of the injection port, performs photoelectric conversion, and then transmits the light intensity peak value of the pulse laser signal absorbed by the multi-component gas to the industrial personal computer module, and the industrial personal computer module calculates to obtain the concentration of the gas to be monitored in the multi-component gas according to the light intensity peak value of the pulse laser signal. In one embodiment, the calculating the concentration of the gas to be monitored in the multi-component gas includes: calibrating the absorption coefficient of the gas to be measured on the pulse laser in advance through a multi-component gas concentration monitoring system; And calculating to obtain the concentration of the gas to be detected in the multi-component gas to be monitored according to the absorption coefficient and the light intensity peak value of the pulse laser signal. In one embodiment, when the laser light source module adopts lasers with multiple wavelengths, the system further comprises a first coupler, and the first coupler is used for coupling lasers with different wavelengths pulsed by the optical pulse module and transmitting the lasers to the gas chamber. In one embodiment, the system further comprises a second coupler that transmits the incident light to the plenum when the second coupler receives the incident light from the first coupler, and transmits the reflected light to the photoelectric conversion module when the second coupler receives the reflected light from the plenum. In one embodiment, when there are N plenums, the system further comprises a third coupler that equally splits the incident light from the second coupler into N parts for transmission into each plenum, where