CN106198484B - A kind of optical fiber sensing system and method carrying hydrogen tube hydrogen and impurity content on-line monitoring for petrochemical industry - Google Patents
A kind of optical fiber sensing system and method carrying hydrogen tube hydrogen and impurity content on-line monitoring for petrochemical industry Download PDFInfo
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- CN106198484B CN106198484B CN201610467063.7A CN201610467063A CN106198484B CN 106198484 B CN106198484 B CN 106198484B CN 201610467063 A CN201610467063 A CN 201610467063A CN 106198484 B CN106198484 B CN 106198484B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
- G01N21/658—Raman scattering enhancement Raman, e.g. surface plasmons
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
- G01N2201/06113—Coherent sources; lasers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/08—Optical fibres; light guides
- G01N2201/088—Using a sensor fibre
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Abstract
The invention discloses a kind of with the optical fiber sensing system and method that carry hydrogen tube hydrogen and impurity content on-line monitoring for petrochemical industry.System includes pipe by measurement air guide, optical signal enhancing gas chamber, light source unit, signal detection unit, signal demodulation unit, data processing unit etc..The laser that light source unit issues, which imports optical signal by optical fiber cable, enhances gas chamber, the Raman signal of excited gas, the signal detected is transferred to the signal demodulation unit positioned at non-anti-explosion area by transmission cable by synchronous signal probe unit, and the data after demodulation are transferred to the real-time display that data processing unit carries out data processing and measurement parameters by RS-485 Serial Port Line.This system can monitor the industries such as petrochemical industry process pipelines middle and high concentration hydrogen and foreign gas (such as CH on-line simultaneously4、CO、CO2、H2S etc.) content, and sensor intrinsic safety, make the on-line monitoring more safety and precise of the hazardous gases such as hydrogen.
Description
Technical field
The present invention relates to a kind of density of hydrogen and impurity content on-line monitoring system and method, specifically one kind is used for
Petrochemical industry carries the optical fiber sensing system and method for hydrogen tube hydrogen and impurity content on-line monitoring.
Background technique
It is widely used currently, carrying hydrogen technique in petrochemical industry, under the conditions ofs temperature appropriate, density of hydrogen and air pressure etc.,
Generate the chemical products such as hydro carbons or the alcohols of certain molecular weight.Ethylene hydrogen is used for hydrocracking unit and wax oil hydrogenation etc.
In device, if ethylene hydrogen purity reduces (CH4、CO、CO2Impurity content rises), the system hydrogen of above-mentioned hydrogenation plant will be reduced
Gas partial pressure, is unfavorable for hydrogenation reaction, seriously affects product quality.On the other hand, ethylene hydrogen used in many enterprises is outer
Purchase, is limited by technique, and certain density CH is unavoidably contained in the ethylene hydrogen from ethylene domethanizing column4If ethylene
Domethanizing column operation is unstable, will lead to CH in ethylene hydrogen4Content increases, so that active principle H2Content reduces, and increases purchase price
Lattice.Therefore, there is an urgent need to ethylene hydrogen purity and impurity content on-line monitoring techniques for the enterprises such as petrochemical industry.
Summary of the invention
Hydrogen tube hydrogen and impurity content on-line monitoring are carried for petrochemical industry to solve the above problems, the invention proposes one kind
Optical fiber sensing system and method.This system sensor intrinsic safety enhances gas chamber for fiber F-P sensing technology by optical signal
It is combined with Raman spectrum analysis technology, it can the industries process pipelines middle and high concentration hydrogen such as on-line real time monitoring petrochemical industry and impurity
Content makes the on-line monitoring more safety and precise of the hazardous gases such as hydrogen.
For achieving the above object, the present invention adopts the following technical scheme that:
A kind of optical fiber sensing system carrying hydrogen tube hydrogen and impurity content on-line monitoring for petrochemical industry, comprising: measurement is led
Pipe (4), optical signal enhance gas chamber (6), light source unit (11), signal detection unit (7), signal demodulation unit (13) sum number by gas
According to processing unit (14)；Air inlet, exhaust outlet, light inlet, signal detection unit are provided in optical signal enhancing gas chamber (6)
Interface；The internal left and right sides of optical signal enhancing gas chamber (6) is inlaid with two pieces of concave mirrors, and light source unit (11) issues
Laser beam imported from one of concave mirror side, another piece of concave mirror side of directive, laser beam is in intracavitary warp
The light of two pieces of concave mirror multiple reflections and every secondary reflection all passes through the centre of cavity, makes the energy for the hot spot assembled
Amount enhancing, to enhance Raman scattering signal；The gas that petrochemical industry carries in hydrogen main pipeline (1) passes sequentially through and manages (4) by measurement air guide
Enter optical signal enhancing gas chamber (6) with admission line (5), and enter exhausting pipeline (9) by exhaust pipe (8), makes gas not
Arrhea the dynamic consistency to guarantee gas componant in gas chamber (6) and main pipeline (1)；The laser that light source unit (11) issues passes through light
Fine optical cable (10) imports optical signal enhancing gas chamber (6), the Raman signal of excited gas, and synchronous signal probe unit (7) will detect
To the signal demodulation unit (13) that is transferred to positioned at non-anti-explosion area by transmission cable (12) of Raman signal demodulated, signal
Data after demodulation are transferred to data processing unit (14) by RS-485 Serial Port Line and carry out data processing by demodulating unit (13)
And the real-time display of measurement parameters.
The optical fiber sensing system, optical signal enhancing gas chamber (6) are connected to pipe (4) by measurement air guide, and measurement is led
Pipe (4) carries hydrogen main pipeline (1) from petrochemical industry and draws by gas, and function is that measurement gas circuit is allowed to separate with main pipeline, guarantees measuring system
Safety, while ensure that optical signal enhancing gas chamber (6) and main pipeline (1) in gas componant consistency；It measures by air guide
Pipe (4) front end is successively connected to pressure reducing valve (2) and shut-off valve (3), pressure reducing valve (2) for reducing the pressure for measuring gas in gas chamber,
Guarantee the operational safety of whole system when measurement, shut-off valve (3) is used to control the on-off of air-flow, in order to system debug；Measurement
When by adjusting pressure reducing valve (2) reduce the gas pressure intensity into gas chamber, then open shut-off valve (3), petrochemical industry carries hydrogen main pipeline
(1) gas in passes sequentially through pipe (4) and admission line (5) by measurement air guide and enters optical signal enhancing gas chamber (6).
The optical fiber sensing system, the position of the bottom surface face signal detection unit (7) of the optical signal enhancing gas chamber
It is provided with plano-concave lens (19), the characteristic of high reflectance has the function of that Raman signal is collected in enhancing.
The optical fiber sensing system, the signal detection unit interface are provided with quartz window wave plate (16), and signal is visited
It surveys unit (7) and receives Raman signal through quartz window wave plate (16).
The internal diameter requirement of the optical fiber sensing system, the admission line (5) and exhaust pipe (8) is consistent, to protect
The gas that card enters optical signal enhancing gas chamber (6) is equal with the amount of gas of discharge, eliminates the circulation of gas chamber internal cause gas and gas chamber
Edge phase separation generate turbulent flow, guarantee optical signal enhancing gas chamber (6) in surveyed gas pressure intensity stability and ingredient it is opposite
Uniformly.
The optical fiber sensing system, only signal detection unit (7) are the optical component of intrinsic safety, and measure system
The signal demodulation unit (13) and light source unit (11), data processing unit (14) live part of system are set to 100 meters of anti-explosion area
Position in addition, to guarantee the safety of measuring system；Light source unit (11) is issued by optical fiber cable (10) when measurement
Exciting light imports optical signal enhancing gas chamber (6), the Raman signal of excited gas indoor gas；It will be believed by transmission cable (12) simultaneously
The signal demodulation unit (13) that the Raman signal that number probe unit (7) detects is transferred to positioned at non-anti-explosion area is demodulated.
The optical fiber sensing system, at the light source unit (11) of the electrification, signal demodulation unit (13) and data
Reason unit (14) is embedded into same cabinet, and the cabinet is far from petrochemical industry anti-explosion area, in order to the protection and measurement safety of system
Property.
The method for carrying out petrochemical industry load hydrogen tube hydrogen and impurity content on-line monitoring according to any system, including with
Lower step: reducing the gas pressure intensity into gas chamber when measurement by adjusting pressure reducing valve (2), then opens shut-off valve (3), petrochemical industry
Gas in load hydrogen main pipeline (1) passes sequentially through pipe (4) and admission line (5) by measurement air guide and enters optical signal enhancing gas chamber
(6), in optical signal enhancing gas chamber (6), the laser beam that light source unit (11) issues is led from one of concave mirror side
Enter, another piece of concave mirror side of directive, laser beam is intracavitary through two pieces of concave mirror multiple reflections and every secondary reflection
Light all pass through the centre of cavity, make the energy enhancing for the hot spot assembled, to enhance Raman scattering signal；Gas is logical
Exhaust pipe (8) are crossed into exhausting pipeline (9), arrhea gas not dynamic to guarantee gas componant in gas chamber (6) and main pipeline (1)
Consistency；The laser that light source unit (11) issues imports optical signal enhancing gas chamber (6), excited gas by optical fiber cable (10)
Raman signal, the Raman signal detected is transferred to positioned at non-by transmission cable (12) by synchronous signal probe unit (7)
The signal demodulation unit (13) of anti-explosion area is demodulated, and the data after demodulation are passed through RS-485 serial ports by signal demodulation unit (13)
Line is transferred to the real-time display that data processing unit (14) carry out data processing and measurement parameters.
Due to using above-mentioned technical solution, the present invention is had the following advantages:
Optical signal enhancing gas chamber of the invention is designed based on F-P enhancing chamber, and basic principle is that light beam is more in gas chamber
Secondary reflection and every light all passes through gas chamber centre makes the light spot energy assembled enhancing；
The system sensor can effectively improve laser using fiber F-P sensing technology is combined with Raman spectrum analysis
The gas detection sensitivity and accuracy of Raman spectroscopy, in addition, the system sensor intrinsic safety, it can on-line real time monitoring stone
The content of industries the process pipelines middle and high concentration hydrogen and impurity such as change keeps the on-line checking more safety of the hazardous gases such as hydrogen quasi-
Really.
Signal detection unit of the invention is fixed on above gas chamber, and only need a Raman probe can be detected it is a variety of at
Divide the signal of gas, such as CH4、CO、CO2、H2S etc., does not need optical sensor；
The present invention is applied to the long-term on-line monitoring of petrochemical industry Hydrogen Line, and density of hydrogen is up to 90% or more in pipeline, to survey
The requirement of explosion proof of amount system is very high, so the optical signal enhancing gas chamber that we connect with pipeline must cannot charge, intrinsic safety；
The charged elements such as our light source unit are all located at the non-anti-explosion area outside 100 meters, are connect, are not directly contacted with by optical cable with gas chamber
To gas；
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention
In figure: 1- carries hydrogen technique main pipeline, 2- pressure reducing valve, 3- shut-off valve, 4- measurement air guide side pipe, 5- admission line, 6-
Optical signal enhancing gas chamber, 7- signal detection unit, 8- exhaust pipe, 9- exhausting pipeline, 10- optical fiber cable, 11- light source unit,
12- transmission cable, 13- signal demodulation unit, 14- data processing unit.
Fig. 2 is optical signal enhancing gas chamber and its internal part structural schematic diagram in the present invention
In figure: 15- signal detection unit mounting flange, 16- quartz window wave plate, 17- concave mirror, the concave surface 18- are anti-
Penetrate mirror, 19- plano-concave lens, A- air inlet, B- exhaust outlet, C light inlet, D- signal detection unit interface；
Specific embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
As shown in Figure 1, petrochemical industry of the invention carry the optical fiber sensing system of hydrogen tube hydrogen and impurity content on-line monitoring with
Pipe (4), optical signal enhance gas chamber (6), light source unit (11), signal detection unit (7), signal by method, including measurement air guide
Demodulating unit (13) and data processing unit (14) etc..
The system run when, first have to by adjusting pressure reducing valve (2) come reduce into optical signal enhancing gas chamber (6) pressure
By force, to guarantee the safety of measuring system, shut-off valve (3) then are opened, the gas that petrochemical industry carries in hydrogen main pipeline (1) passes sequentially through survey
It measures pipe (4) and admission line (5) by air guide and enters optical signal enhancing gas chamber (6), and enter exhausting pipeline by exhaust pipe (8)
(9), the function of pipe (4) is to separate measuring system with main pipeline (1) by measurement air guide herein, guarantees the safety of measuring system
Property, while flow gas to guarantee the consistency of gas componant in optical signal enhancing gas chamber (6) and main pipeline (1).Light source list
The laser that first (11) issue, which imports optical signal by optical fiber cable (10), enhances gas chamber (6), the Raman signal of excited gas, simultaneously
The signal detected is transferred to the signal demodulation unit positioned at non-anti-explosion area by transmission cable (12) by signal detection unit (7)
(13) it is demodulated, the data after demodulation are transferred to data processing unit by RS-485 Serial Port Line by signal demodulation unit (13)
(14) real-time display of data processing and measurement parameters is carried out.
With reference to Fig. 2, two pieces of concave mirrors 17 and 18, shape are inlaid at left and right sides of the optical signal enhancing plenum interior
Enhance chamber at F-P, the light beam entered from gas chamber right side is intracavitary through two pieces of multiple reflections of concave mirror 17 and 18 and each
Reflection bar light all passes through the centre of cavity, makes the energy enhancing for the hot spot assembled, to enhance Raman scattering signal.Gas
Plano-concave lens 19 is equipped on the downside of room, the characteristic of high reflectance has the function of that Raman signal is collected in enhancing.The upside of gas chamber
It is equipped with quartz window wave plate 16, effect is the collection of the leakproofness and signal detection unit of guarantee gas chamber for signal.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (7)
1. a kind of optical fiber sensing system for carrying hydrogen tube hydrogen and impurity content on-line monitoring for petrochemical industry, which is characterized in that packet
Include: pipe (4), optical signal enhancing gas chamber (6), light source unit (11), signal detection unit (7), signal demodulation are single by measurement air guide
First (13) and data processing unit (14)；Air inlet, exhaust outlet, light inlet, letter are provided in optical signal enhancing gas chamber (6)
Number probe unit interface；The internal left and right sides of optical signal enhancing gas chamber (6) is inlaid with two pieces of concave mirrors, light source list
The laser beam that first (11) issue is imported from one of concave mirror side, another piece of concave mirror side of directive, laser
Beam all passes through the centre of cavity in the intracavitary light through two pieces of concave mirror multiple reflections and every secondary reflection, makes to assemble
Hot spot energy enhancing, to enhance Raman scattering signal；The gas that petrochemical industry carries in hydrogen main pipeline (1) passes sequentially through measurement and leads
Pipe (4) and admission line (5) enter optical signal enhancing gas chamber (6) by gas, and enter exhausting pipeline (9) by exhaust pipe (8),
Gas is set not arrhea the dynamic consistency to guarantee gas componant in gas chamber (6) and main pipeline (1)；What light source unit (11) issued swashs
Light imports optical signal enhancing gas chamber (6), the Raman signal of excited gas, synchronous signal probe unit by optical fiber cable (10)
(7) Raman signal detected is transferred to signal demodulation unit (13) progress positioned at non-anti-explosion area by transmission cable (12)
Data after demodulation are transferred to data processing unit (14) by RS-485 Serial Port Line and carried out by demodulation, signal demodulation unit (13)
The real-time display of data processing and measurement parameters；Optical signal enhancing gas chamber (6) is connected to pipe (4) by measurement air guide, surveys
It measures pipe (4) by air guide to draw from petrochemical industry load hydrogen main pipeline (1), function is that measurement gas circuit is allowed to separate with main pipeline, guarantees measurement
The safety of system, while ensure that the consistency of gas componant in optical signal enhancing gas chamber (6) and main pipeline (1)；Measurement is led
Pipe (4) front end is successively connected to pressure reducing valve (2) and shut-off valve (3) by gas, and pressure reducing valve (2) is for reducing the pressure for measuring gas in gas chamber
Power guarantees the operational safety of whole system when measurement, and shut-off valve (3) is used to control the on-off of air-flow, in order to system debug；It surveys
Reduce the gas pressure intensity into gas chamber when amount by adjusting pressure reducing valve (2), then open shut-off valve (3), petrochemical industry carries hydrogen supervisor
Gas in road (1) passes sequentially through pipe (4) and admission line (5) by measurement air guide and enters optical signal enhancing gas chamber (6).
2. optical fiber sensing system according to claim 1, which is characterized in that the bottom surface face of the optical signal enhancing gas chamber
The position of signal detection unit (7) is provided with plano-concave lens (19), and there is the characteristic of high reflectance enhancing to collect Raman signal
Effect.
3. optical fiber sensing system according to claim 1, which is characterized in that the signal detection unit interface is provided with stone
English window wave plate (16), signal detection unit (7) receive Raman signal through quartz window wave plate (16).
4. optical fiber sensing system according to claim 1, which is characterized in that the admission line (5) and exhaust pipe
(8) internal diameter requires unanimously, to guarantee that the gas for entering optical signal enhancing gas chamber (6) is equal with the amount of gas of discharge, to eliminate
The turbulent flow that the circulation of gas chamber internal cause gas is generated with the phase separation of gas chamber edge, guarantees surveyed gas pressure in optical signal enhancing gas chamber (6)
Strong stability and ingredient it is relatively uniform.
5. optical fiber sensing system according to claim 1, which is characterized in that only signal detection unit (7) are intrinsic peace
Full optical component, and the signal demodulation unit (13) of measuring system and light source unit (11), data processing unit (14) band
Electric part is set to the position other than 100 meters of anti-explosion area, to guarantee the safety of measuring system；Pass through optical fiber cable when measurement
(10) exciting light for issuing light source unit (11) imports optical signal enhancing gas chamber (6), the Raman signal of excited gas indoor gas；
The Raman signal that signal detection unit (7) detects is transferred to the signal positioned at non-anti-explosion area by transmission cable (12) simultaneously
Demodulating unit (13) is demodulated.
6. optical fiber sensing system according to claim 1, which is characterized in that the light source unit (11), the signal of electrification
Demodulating unit (13) and data processing unit (14) are embedded into same cabinet, the cabinet far from petrochemical industry anti-explosion area, so as to
In the protection and measurement safety of system.
7. -6 any systems carry out the side that petrochemical industry carries hydrogen tube hydrogen and impurity content on-line monitoring according to claim 1
Method, which comprises the following steps: reduce the gas pressure intensity into gas chamber when measurement by adjusting pressure reducing valve (2), so
Shut-off valve (3) are opened afterwards, the gas that petrochemical industry carries in hydrogen main pipeline (1) passes sequentially through pipe (4) and admission line (5) by measurement air guide
Enhance gas chamber (6) into optical signal, in optical signal enhancing gas chamber (6), the laser beam that light source unit (11) issues is from wherein one
Block concave mirror side imports, and another piece of concave mirror side of directive, laser beam is intracavitary more through two pieces of concave surface transmitting mirrors
The light of secondary reflection and every secondary reflection all passes through the centre of cavity, makes the energy enhancing for the hot spot assembled, to enhance
Raman scattering signal；Gas enters exhausting pipeline (9) by exhaust pipe (8), make gas do not arrhea it is dynamic with guarantee gas chamber (6) with
The consistency of gas componant in main pipeline (1)；The laser that light source unit (11) issues imports optical signal by optical fiber cable (10)
Enhance gas chamber (6), the Raman signal of excited gas, the Raman signal detected is passed through transmission by synchronous signal probe unit (7)
The signal demodulation unit (13) that optical cable (12) is transferred to positioned at non-anti-explosion area is demodulated, after signal demodulation unit (13) will demodulate
Data be transferred to the real-time display that data processing unit (14) carry out data processing and measurement parameters.
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| CN108593622B (en) * | 2017-12-26 | 2021-07-13 | 武汉理工大学 | Intelligent integrated optical fiber sensing system for petrochemical production process and real-time monitoring and diagnosing method thereof |
| CN108344727B (en) * | 2018-04-27 | 2024-01-30 | 中国石油化工集团有限公司 | Raman signal collection system and method |
| CN108426872A (en) * | 2018-06-13 | 2018-08-21 | 武汉理工大学 | A kind of gas concentration on-line measurement system and its method for Raman scattering optical fiber sensing |
| CN110530848A (en) * | 2019-09-27 | 2019-12-03 | 国网重庆市电力公司电力科学研究院 | A kind of detection device and detection method |
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