CN207540626U - Foam liquid level monitoring system based on fiber-optic grating sensor - Google Patents
Foam liquid level monitoring system based on fiber-optic grating sensor Download PDFInfo
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- CN207540626U CN207540626U CN201721256324.7U CN201721256324U CN207540626U CN 207540626 U CN207540626 U CN 207540626U CN 201721256324 U CN201721256324 U CN 201721256324U CN 207540626 U CN207540626 U CN 207540626U
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Abstract
The utility model provides a kind of foam liquid level monitoring system based on fiber-optic grating sensor, including two Fiber Grating Liquid Depth Sensors and monitoring host, is mainly used for the level monitoring of coke-oven plant's desulfurization regeneration tower.Using fiber grating as liquid level sensor, liquid level information, real time on-line monitoring liquid level situation of change are acquired by the variation for detecting grating.One of sensor is mounted on the container bottoms such as desulfurization regeneration tower, surveys liquid level for monitoring, another sensor is mounted at limiting height, for monitoring foam height.Simultaneity factor includes selftest module, if monitoring system breaks down, you can send out alarm.Monitoring data can store and facilitate inquiry, printing.
Description
Technical field
The present invention relates to the level monitoring systems containing foam liquid, and in particular to foam in chemical industry desulfurization regeneration tower
The monitoring system of liquid level.
Background technology
The domestic coke-oven plant for using HPF wet desulfurizing process at present, due to the requirement of technique, needs to its desulfurization regeneration tower
Interior substance carries out level gauging or monitoring.The common method for measuring liquid level has：
1）Laser measurement：Laser type sensor is based on optical detection principle, passes through body surface reflection light to receiver
It is detected, but it is not suitable for applied to transparency liquid, containing foam or steam ambient, fluctuation liquid, vibration environment etc.；
2）TDR (Time Domain Reflectometry)/guided wave radar/microwave principle measures：Have the benefit of laser measurement, and be applicable in
In the various level sensings containing foam, do not influenced by liquid color, may apply even to high viscosity liquid, interfered by external environment
It is relatively small, but it measures height and is generally less than 6 meters；
3）Ultrasonic measurement：Since its principle is to calculate liquid level height by detecting the time difference of ultrasonic wave transmission and reflection
Degree, therefore easily influenced by the energy loss of ultrasonic propagation.But when being used in containing steam, bisque when environment, detecting distance
It will be obviously shortened, it is not recommended that wave environment, such as foam are being inhaled in use；
4）Tuning fork vibration measures：It is only output switch parameter that tuning-fork type, which measures, it is impossible to be used in continuity monitors liquid height.Its
Principle is：When liquid or bulk cargo fill two vibrating tines, when resonant frequency changes, sent out out by detection frequency shift
OFF signal.In addition, trepanning is needed to be installed on container side in most cases；
5）Photoelectricity refraction type measures：The detection mode sends out light source by sensor internal, and light source is complete by transparent resin
When reflexing to sensor recipient, but encountering liquid level, some light will refract to liquid, so as to which sensor detection total reflection is returned
The reduction of light value monitors liquid level.But transparency liquid is applicable only to, while only exports on-off model；
6）Static pressure type measures：The measurement method is using the pressure sensor for being installed on bottom, by detecting bottom liquid pressure
Power, conversion calculate liquid level, and detection mode requirement is using high-precision, flush type pressure sensor, while the process that converts
It needs constantly to be calibrated, advantage is not limited to be detectable by liquid level, but height is higher, and sensor accuracy requires to get over
Height needs to repeat to calibrate when using or replace for a long time liquid；
7）Measurement by capacitance：Capacitance variation caused by measurement by capacitance is mainly changed by detection due to liquid level
To measure controlling level.Capacitance sensor is easily by different container material qualities and solution properties affect, such as plastic containers and extension
Material situation easily influences the capacitance sensor of analog output；
8）Float-ball type detects：Which is most simple, most ancient detection mode.Mainly pass through the oscilaltion of floating ball
The variation of liquid level is detected, is mechanical detection, for accuracy of detection easily by buoyancy effect, repeatable accuracy is poor, and different liquids need
It recalibrates.
Substance in regenerator is mainly liquid, but due to that can generate gaseous material in technical process, is caused in regenerator
Liquid top have larger amount of sulphur foam.Because of the influence of foam, some measuring methods are difficult accurately to measure liquid level, some sides
Method liquid level gauge usage time one is grown, it will cannot accurately show liquid level, these cause certain difficulty to the production of coking industry.
It to sum up analyzes, due to the presence of foam, in coking industry mostly using static pressure type measuring method, to exclude foam to surveying
Measure the influence of accuracy.Traditional pressure sensor has piezoresistive pressure sensor, capacitance pressure transducer, semiconductor strain
Piece pressure sensor, inductance pressure transducer, resonance type pressure sensor and capacitance acceleration transducer etc..These sensings
Device belongs to electronic product, and for a long time, electrical property can change, and cause larger measurement error or even sensor degradation；
Realize on-line monitoring, long-time energization work, reliability is also easy to go wrong；And it is influenced by linear characteristic, meeting
Generate certain measurement error.
Invention content
In order to solve problem above, the present invention provides a kind of foam liquid level monitoring system based on fiber-optic grating sensor
System, can either accurately measure liquid level, and can detect the warning height of foam, while can realize long-term on-line monitoring, be
Ensure that technique and safety in production provide reliable data foundation.
Relative to conditional electronic class sensor, the advantages of fiber-optic grating sensor：
1）Optical element, no power, essential safety；
2）Wavelength-encoding is not influenced by the light-intensity variation of light source, and stability is good；
3）Long lifespan is suitble to long term monitoring；
4）Anticorrosive, electromagnetism interference is suitble to various severe engineering-environment monitorings；
5）Precision height, high sensitivity, high resolution；
6）It is simple in structure, it is easy to lay；
7）A piece optical fiber can connect multiple sensors, it is easy to accomplish distributed automatization is monitored on-line.
Foam liquid level monitoring system based on fiber-optic grating sensor, as liquid level sensor, is led to using fiber grating
Cross the variation acquisition liquid level information of detection grating, real time on-line monitoring liquid level situation of change.
System can accomplish grading forewarning system according to preset alarm threshold value, and simultaneity factor has real-time display parameter function,
The data of monitoring can store and facilitate inquiry, printing, and system has self-checking function.
To achieve these goals, the present invention takes following technical scheme.
The present invention provides a kind of foam liquid level monitoring system based on fiber-optic grating sensor, and the system comprises two
A Fiber Grating Liquid Depth Sensor and monitoring host, one of sensor are mounted on the container bottoms such as desulfurization regeneration tower, are used for
Liquid level is detected, another sensor is mounted at limiting height, for monitoring foam height；
After the sensor is connected with Transmission Fibers, monitoring host is then connected to, monitoring host analyzes optical signal demodulation,
It realizes level monitoring function, and monitoring result is exported, necessary alarm；
The monitoring host includes laser emission element, receiving unit, demodulation analysis unit, output unit, alarm unit,
Further include selftest module.
The output form of the output unit can be configured as needed, including storing, printing, the diversified forms such as showing.
The alarm unit can also be sound, the output of light form.
Description of the drawings
System construction drawing of the attached drawing 1 for the present invention；
Attached drawing 2 is a kind of embodiment of sensor scheme of installation；
Attached drawing 3 is a kind of embodiment of sensor scheme of installation；
Reference sign：1-container or desulfurization regeneration tower, 2- contain frothy liquid, 3- foams, 4,5- valves, 6-
Outlet tube, 7- inlet tubes, FBG1, FBG2- fiber-optic grating sensor.
Specific embodiment
The present invention is done with reference to the accompanying drawings and embodiments further describe in detail in detail it is bright.
The present invention realizes the implementation on-line condition monitoring of foam liquid liquid level, and can be classified by preset threshold value
Alarm, and system has self-checking function.
The present invention provides a kind of foam liquid level monitoring system based on fiber-optic grating sensor, should as shown in Fig. 1
System includes two Fiber Grating Liquid Depth Sensors and monitoring host, and one of sensor FBG1 is mounted on desulfurization regeneration tower etc.
Container bottom, for detecting liquid level, another sensor FBG2 is mounted at limiting height, for monitoring foam height；Sensing
After device FBG1 and FBG2 are connected with Transmission Fibers, it is then connected to monitoring host；It monitors host and includes transmitter unit 10, receiving unit
20th, demodulation analysis unit 30, output unit 40, alarm unit 50, further include selftest module 60.
Sensor FBG1 is mounted on the bottom of the foam liquid container such as desulfurization regeneration tower, by the pressure of liquid, sensing
Device generates corresponding signal, and signal magnitude and pressure are directly proportional, and linear characteristic is better than traditional pressure sensor, can with this
Detect liquid level.
Since bubble content changes at any time in container, height is unstable, and sensor FBG1 can only be detected
The height of liquid；Sensor FBG2 is mounted on limiting height, and when foam height reaches limiting height, FBG2 can detect letter
Breath, detection host send out signal, operating personnel are prompted to be handled.
As shown in Figure 1, monitoring host includes transmitter unit 10, receiving unit 20, demodulation analysis unit 30, output unit
40th, alarm unit 50 further include selftest module 60.
Transmitter unit 10 generates broad band laser, and fiber-optic grating sensor FBG1 and FBG2 are transmitted to by Transmission Fibers, passes
Sensor can carry out selective reflecting to incident broadband light, and reflected light wavelength is related with the optical grating construction of sensor, sensor
By the pressure influence of liquid or foam, optical grating construction also changes therewith, and the optical maser wavelength reflected also generates respective change.It receives
The laser of 20 receiving sensor of unit reflection is translated into 30 required signal form of demodulation analysis unit, and to sensing
Device makes a mark, and demodulation analysis unit 30 modulates signals into calculating, generates and changes corresponding pressure with sensor light grid structure
Signal realizes the real time on-line monitoring of liquid level；As a result it stores, show and/or prints in output unit 40；Simultaneously in demodulation point
It analyses in unit 30, presets different threshold values, monitoring result compares therewith, if reaching corresponding threshold value, in addition to exporting
Other than unit 40 exports, early warning, alarm signal also are provided in alarm unit 50, form is shown including sound, light and/or electrical screen
Deng.
Monitoring host has the interface of a variety of openings, can access new sensor and early warning, warning device at any time, also may be used
To access in higher level's monitoring system.
If the system of monitoring breaks down, receiving unit 20 will receive exception information, and selftest module 50 is believed according to this
Failure judgement reason is ceased, result is sent to output unit.
As shown in Fig. 2, for the desulfurization regeneration tower 1 of coke-oven plant, sensor may be mounted in the valve of a repacking, so
It is installed along with afterwards with valve on inlet tube 7 and outlet tube 6, position is preferably in the inside of valve 4,5.The advantages of this method is
Installation is simple, and replacing sensor is convenient, and shortcoming is the liquid flowing if in pipeline, can influence the accuracy of testing result.But
The regenerator that production run has been put into is transformed, this installation form is still more feasible.
It is further to improve, it is punched in the side of regenerator, then welds a diversion pipe, sensing is installed on diversion pipe
Device, as shown in Figure 3.This method not only overcomes shortcoming, remains advantage, and can be right according to production needs with respect to Fig. 2
The height of punching is adjusted, and better meets the demand of production.
Claims (6)
1. the foam liquid level monitoring system based on fiber-optic grating sensor, including two Fiber Grating Liquid Depth Sensors and prison
Survey host, it is characterised in that：
The sensor one is mounted on foam liquid container bottom, and for detecting liquid level, another is mounted at limiting height,
For monitoring foam height；
The monitoring host includes laser emission element, receiving unit, demodulation analysis unit, output unit, alarm unit, also wraps
Include selftest module；
After the sensor is connected with Transmission Fibers, it is then connected to monitoring host；
The monitoring host analyzes optical signal demodulation, realizes level monitoring function, and monitoring result is exported, when necessary
Alarm.
2. the foam liquid level monitoring system according to claim 1 based on fiber-optic grating sensor, it is characterised in that：
The output form of the output unit can be configured as needed, including storing, printing, the diversified forms such as showing.
3. the foam liquid level monitoring system according to claim 1 based on fiber-optic grating sensor, it is characterised in that：
The alarm unit can also be sound, the output of light form.
4. according to the foam liquid level monitoring system of claim 1,2 or 3 any one of them based on fiber-optic grating sensor,
It is characterized in that：Described two Fiber Grating Liquid Depth Sensors are mounted on desulfurization regeneration tower.
5. the foam liquid level monitoring system according to claim 4 based on fiber-optic grating sensor, it is characterised in that：
Described two Fiber Grating Liquid Depth Sensors are first mounted on valve respectively, and then together with valve, one is mounted on desulfurization again
The inlet tube of raw tower, another is mounted on the outlet tube liquid pipe of desulfurization regeneration tower.
6. the foam liquid level monitoring system according to claim 4 based on fiber-optic grating sensor, it is characterised in that：
Described two Fiber Grating Liquid Depth Sensors are first mounted on valve respectively, then together with valve, mounted on upper and lower drain
Pipe；It is first punched on desulfurization regeneration tower, and welds catheter；
In desulfurization regeneration tower bottom, one is limiting height for the position one of punching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721256324.7U CN207540626U (en) | 2017-09-27 | 2017-09-27 | Foam liquid level monitoring system based on fiber-optic grating sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721256324.7U CN207540626U (en) | 2017-09-27 | 2017-09-27 | Foam liquid level monitoring system based on fiber-optic grating sensor |
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| Publication Number | Publication Date |
|---|---|
| CN207540626U true CN207540626U (en) | 2018-06-26 |
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| CN201721256324.7U Expired - Fee Related CN207540626U (en) | 2017-09-27 | 2017-09-27 | Foam liquid level monitoring system based on fiber-optic grating sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107687880A (en) * | 2017-09-27 | 2018-02-13 | 西安迅航光电科技有限公司 | Foam liquid level monitoring system based on fiber-optic grating sensor |
| CN109724678A (en) * | 2019-03-05 | 2019-05-07 | 华北电力科学研究院有限责任公司 | Consider the absorbing tower liquid-level height measuring device and method of slurries foam falseness liquid level |
-
2017
- 2017-09-27 CN CN201721256324.7U patent/CN207540626U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107687880A (en) * | 2017-09-27 | 2018-02-13 | 西安迅航光电科技有限公司 | Foam liquid level monitoring system based on fiber-optic grating sensor |
| CN109724678A (en) * | 2019-03-05 | 2019-05-07 | 华北电力科学研究院有限责任公司 | Consider the absorbing tower liquid-level height measuring device and method of slurries foam falseness liquid level |
| CN109724678B (en) * | 2019-03-05 | 2024-03-22 | 华北电力科学研究院有限责任公司 | Absorption tower liquid level height measuring device and method considering false liquid level of slurry foam |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180626 Termination date: 20200927 |
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| CF01 | Termination of patent right due to non-payment of annual fee |