CN110954240A - OCM reactor temperature monitoring system based on FBG sensor - Google Patents
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Abstract
The invention discloses an OCM reactor temperature monitoring system based on an FBG sensor, which comprises a broadband light source module, a tunable F-P filter module, a coupler module, a sensing grating array module and a photoelectric detector module, wherein the broadband light source module is a high-stability light source mainly designed for scientific research and industrial production; the invention relates to a method for monitoring the temperature of a methane oxidation coupling reactor, which is characterized in that a high-power and wide-spectrum SLD (SLED) module is internally provided, and special protective measures are taken on the circuit design and the optical path processing aiming at the particularity of an SLD (SLED) laser, so that the sudden change of current and voltage and the damage of return light to the SLD (SLED) laser are avoided, and the long-term, safe and stable work of a light source is ensured.
Description
Technical Field
The invention belongs to the field of petrochemical production process monitoring, and particularly relates to an OCM reactor temperature monitoring system based on an FBG sensor.
Background
At present, more than 90 percent of ethylene abroad comes from naphtha and ethane cracking, and the ethylene mainly comes from naphtha and methanol cracking at home. The cracking furnace has complex production process and high production cost, and with the gradual shortage of petroleum resources, researches on the production of ethylene by using new raw materials and new processes have been started at home and abroad, wherein the most representative technology is a technology for preparing ethylene by oxidative coupling of methane, methane in natural gas is used as a raw material, the methane can be converted into ethylene by only one-step reaction process, and if large-scale industrial production can be realized, the cracking furnace has great significance for breaking the bottleneck of raw material sources in the ethylene industry, reducing the production cost (about 700-2200 yuan/ton), enhancing the competitiveness of the ethylene industry and downstream industries, and promoting the epoch-making change of the chemical industry.
The oxidative coupling of methane is a rapid and strongly exothermic reaction under the condition of high temperature (750-950 ℃). The temperature of the catalyst bed layer is rapidly increased due to the release of a large amount of reaction heat, and if hot spots are generated due to uneven distribution, the catalytic performance of the catalyst is seriously affected, and meanwhile, the reactor is damaged. Therefore, the distributed temperature monitoring and further temperature control of the reactor bed layer is a key step of methane oxidation coupling engineering. The reactors currently used in the OCM reaction process mainly include fluidized bed reactors, fixed bed reactors, membrane reactors and the like.
Due to the high temperature and the high flow rate of the oxidative coupling, the service life of a common temperature sensor can only be about 12-18 months. In the actual use process, in order to prevent the temperature sensor from being eroded, a surface thermocouple is generally used for measuring the temperature on the outer surface of the reactor, although the temperature measuring method solves the erosion problem, the temperature lag and the influence of the external temperature difference can not truly reflect the accurate temperature and the temperature distribution condition in the reactor, and the method belongs to an indirect measuring mode and restricts the temperature monitoring effect.
The ultra-high temperature grating FBG is manufactured based on single mode fiber and can resist severe environment temperature up to 1000 ℃. The annealing temperature is up to 1100 ℃, the ultrahigh-temperature grating is naturally packaged (written) on the optical fiber itself, the ultrahigh-temperature grating can be directly used as a bare grating, and can also be used for further packaging to package the ultrahigh-temperature grating into various types of advanced grating sensors. The ultrahigh temperature grating has the characteristics of small size, quick response time and good linearity between wavelength and temperature, and has the advantages of simple and quick operation and installation and is inherent to the fiber grating sensor.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme:
an OCM reactor temperature monitoring system based on FBG sensors comprises a broadband light source module, a tunable F-P filter module, a coupler module, a sensing grating array module and a photoelectric detector module, wherein the broadband light source module is a high-stability light source mainly designed for scientific research and industrial production; a built-in SLD (SLED) module with high power and wide spectrum adopts special protection measures on circuit design and optical path processing aiming at the particularity of an SLD (SLED) laser, avoids sudden change of current and voltage and damage of return light to the SLD (SLED) laser, and ensures that a light source works safely and stably for a long time;
the tunable F-P filter module mainly comprises a tunable F-P filter, wherein the tunable F-P filter is a wavelength selection device, has wide application in the fields of optical fiber communication and optical fiber sensing, allows light with the wavelength having a multiple relation with the length of an F-P cavity to pass through, attenuates light with other wavelengths according to an Airy function, and has the characteristics of wide tuning range, narrow bandwidth and small PDL;
the coupler module is mainly used for dividing one path of microwave power into a plurality of paths in proportion in a microwave system so as to realize power distribution, and the photoelectric coupler is an electric-to-optical-to-electric conversion device for transmitting electric signals by taking light as a medium. It is composed of two parts of luminous source and light receiver. The light source and the light receiver are assembled in the same closed shell and are isolated from each other by a transparent insulator. The pin of the light emitting source is an input end, and the pin of the light receiver is an output end;
the sensing grating array module is mainly composed of a grating sensor, the sensor measures displacement by adopting a grating stack grating stripe principle, the grating is densely and equidistantly parallel scribed lines on a piece of strip-shaped optical glass, the density of the scribed lines is 10-100 lines/mm, the stack grating stripes formed by the grating have an optical amplification effect and an error averaging effect, so that the measurement precision can be improved, the sensor is composed of four parts, namely a scale grating, an indication grating, a light path system and a measurement system, and when the scale grating moves relative to the indication grating, the light and shade alternate stack grating stripes which are approximately distributed according to a sine rule are formed. The stripes move at the relative movement speed of the grating and directly irradiate the photoelectric element, a series of electric pulses are obtained at the output end of the photoelectric element, and digital signals are generated by an amplifying, shaping, direction-distinguishing and counting system to be output so as to directly display the measured displacement;
the photodetector module includes: the device comprises a shell, wherein a function key is arranged on the surface of the shell and connected with a microprocessor, and the microprocessor is respectively connected with a read only memory, a display and a light emitting diode.
The working steps are as follows:
the method comprises the following steps: light emitted by the broadband light source module enters the tunable F-P filter module, and under the action of sawtooth wave scanning voltage, light signals with different wavelengths periodically pass through the F-P filter module and are then divided into two branches by the coupler module;
step two: one path of light with the wavelength of about 90% enters the sensing grating array module through the coupler module, the Bragg reflection wavelengths of all gratings in the array are required to be all in the scanning range of the F-P filter module, and the reflection wavelengths of all the gratings are different so as to avoid signal crosstalk; the other path of light with the concentration of about 10% is incident into the F-P etalon through the coupler module, and the branch is used for calibrating the tunable F-P filter module so as to eliminate the influence of cavity length drift of the tunable F-P filter module on the measurement precision;
step three: in the sensing grating channel, when the scanning wavelength of the F-P filter module is consistent with the reflection wavelength of the fiber grating, the light energy detected by the photoelectric detector is the largest;
step four: and acquiring an electric signal output by the photoelectric detector, recording corresponding sawtooth voltage when the electric signal is maximum, and obtaining a value of the reflection wavelength according to the relation between the sawtooth voltage and the wavelength, thereby achieving the purpose of sensing signal demodulation. Compared with the prior art, the OCM reactor temperature monitoring system based on the FBG sensor provided by the invention has the following beneficial effects:
the invention serially connects the ultrahigh temperature grating FBGs to the temperature monitoring of the methane oxidation coupling reactor, realizes the distribution monitoring of the temperature field in the reactor, fully utilizes the advantages of the optical fiber sensing technology, and directly and precisely monitors the temperature of the reactor.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention without limiting the invention in which:
FIG. 1 is a schematic structural diagram of an OCM reactor temperature monitoring system based on FBG sensors according to the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution:
an OCM reactor temperature monitoring system based on FBG sensors comprises a broadband light source module, a tunable F-P filter module, a coupler module, a sensing grating array module and a photoelectric detector module, wherein the broadband light source module is a high-stability light source mainly designed for scientific research and industrial production; a built-in SLD (SLED) module with high power and wide spectrum adopts special protection measures on circuit design and optical path processing aiming at the particularity of an SLD (SLED) laser, avoids sudden change of current and voltage and damage of return light to the SLD (SLED) laser, and ensures that a light source works safely and stably for a long time;
the tunable F-P filter module mainly comprises a tunable F-P filter, wherein the tunable F-P filter is a wavelength selection device, has wide application in the fields of optical fiber communication and optical fiber sensing, allows light with the wavelength having a multiple relation with the length of an F-P cavity to pass through, attenuates light with other wavelengths according to an Airy function, and has the characteristics of wide tuning range, narrow bandwidth and small PDL;
the coupler module divides one path of microwave power into several paths in proportion in a microwave system so as to realize power distribution, and the photoelectric coupler is an electric-to-optical-to-electric conversion device which transmits electric signals by taking light as a medium. It is composed of two parts of luminous source and light receiver. The light source and the light receiver are assembled in the same closed shell and are isolated from each other by a transparent insulator. The pin of the light emitting source is an input end, and the pin of the light receiver is an output end;
the sensing grating array module mainly comprises a grating sensor, and is a sensor for measuring displacement by adopting a grating stack stripe principle, the grating is densely and equidistantly parallel scribed lines on a piece of strip-shaped optical glass, the density of the scribed lines is 10-100 lines/mm, the stack stripe formed by the grating has an optical amplification effect and an error averaging effect, so that the measurement precision can be improved, the sensor comprises four parts, namely a scale grating, an indication grating, a light path system and a measurement system, and when the scale grating moves relative to the indication grating, the light and shade alternate stack stripe which is approximately distributed according to a sine rule is formed. The stripes move at the relative movement speed of the grating and directly irradiate the photoelectric element, a series of electric pulses are obtained at the output end of the photoelectric element, and digital signals are generated by an amplifying, shaping, direction-distinguishing and counting system to be output so as to directly display the measured displacement;
the photodetector module includes: the device comprises a shell, wherein a function key is arranged on the surface of the shell and connected with a microprocessor, and the microprocessor is respectively connected with a read only memory, a display and a light emitting diode.
The working principle and the using process of the invention are as follows: after the optical fiber demodulation system is installed, light emitted by a broadband light source enters the tunable F-P filter, optical signals with different wavelengths periodically pass through the F-P filter under the action of sawtooth wave scanning voltage, and then are divided into two branches through the coupler. One path of light with the reflection wavelength being about 90% enters the sensing grating array through the coupler, the Bragg reflection wavelengths of all gratings in the array are required to be all in the scanning range of the F-P filter, and the reflection wavelengths of all the gratings are different, so that signal crosstalk is avoided; and the other path of light with the concentration of about 10% is incident into the F-P etalon through the coupler, and the branch is used for calibrating the tunable F-P filter so as to eliminate the influence of the cavity length drift of the tunable F-P filter on the measurement precision. In the sensing grating channel, when the scanning wavelength of the F-P filter is consistent with the reflection wavelength of the fiber grating, the light energy detected by the photoelectric detector is maximum. At the moment, the electric signal output by the photoelectric detector is collected, when the electric signal is maximum, the corresponding sawtooth voltage is recorded, and then the value of the reflection wavelength can be obtained according to the relation between the sawtooth voltage and the wavelength, so that the purpose of sensing signal demodulation is achieved.
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 (2)
1. The utility model provides a OCM reactor temperature monitoring system based on FBG sensor, includes broadband light source module, tunable F-P filter module, coupler module, sensing grating array module and photoelectric detector module, its characterized in that: the broadband light source module is a high-stability light source designed for scientific research and industrial production; a built-in SLD (SLED) module with high power and wide spectrum adopts special protection measures on circuit design and optical path processing aiming at the particularity of an SLD (SLED) laser, avoids sudden change of current and voltage and damage of return light to the SLD (SLED) laser, and ensures that a light source works safely and stably for a long time;
the tunable F-P filter module mainly comprises a tunable F-P filter, wherein the tunable F-P filter is a wavelength selection device, has wide application in the fields of optical fiber communication and optical fiber sensing, allows light with the wavelength having a multiple relation with the length of an F-P cavity to pass through, attenuates light with other wavelengths according to an Airy function, and has the characteristics of wide tuning range, narrow bandwidth and small PDL;
the coupler module is mainly used for dividing one path of microwave power into a plurality of paths in proportion in a microwave system so as to realize power distribution, and the photoelectric coupler is an electric-to-optical-to-electric conversion device for transmitting electric signals by taking light as a medium. It is composed of two parts of luminous source and light receiver. The light source and the light receiver are assembled in the same closed shell and are isolated from each other by a transparent insulator. The pin of the light emitting source is an input end, and the pin of the light receiver is an output end;
the sensing grating array module is mainly composed of a grating sensor, the sensor measures displacement by adopting a grating stack grating stripe principle, the grating is densely and equidistantly parallel scribed lines on a piece of strip-shaped optical glass, the density of the scribed lines is 10-100 lines/mm, the stack grating stripes formed by the grating have an optical amplification effect and an error averaging effect, so that the measurement precision can be improved, the sensor is composed of four parts, namely a scale grating, an indication grating, a light path system and a measurement system, and when the scale grating moves relative to the indication grating, the light and shade alternate stack grating stripes which are approximately distributed according to a sine rule are formed. The stripes move at the relative movement speed of the grating and directly irradiate the photoelectric element, a series of electric pulses are obtained at the output end of the photoelectric element, and digital signals are generated by an amplifying, shaping, direction-distinguishing and counting system to be output so as to directly display the measured displacement;
the photodetector module includes: the device comprises a shell, wherein a function key is arranged on the surface of the shell and connected with a microprocessor, and the microprocessor is respectively connected with a read only memory, a display and a light emitting diode.
2. The OCM reactor temperature monitoring system based on FBG sensors as claimed in claim 1, wherein: the working steps are as follows:
the method comprises the following steps: light emitted by the broadband light source module enters the tunable F-P filter module, and under the action of sawtooth wave scanning voltage, light signals with different wavelengths periodically pass through the F-P filter module and are then divided into two branches by the coupler module;
step two: one path of light with the wavelength of about 90% enters the sensing grating array module through the coupler module, the Bragg reflection wavelengths of all gratings in the array are required to be all in the scanning range of the F-P filter module, and the reflection wavelengths of all the gratings are different so as to avoid signal crosstalk; the other path of light with the concentration of about 10% is incident into the F-P etalon through the coupler module, and the branch is used for calibrating the tunable F-P filter module so as to eliminate the influence of cavity length drift of the tunable F-P filter module on the measurement precision;
step three: in the sensing grating channel, when the scanning wavelength of the F-P filter module is consistent with the reflection wavelength of the fiber grating, the light energy detected by the photoelectric detector is the largest;
step four: and acquiring an electric signal output by the photoelectric detector, recording corresponding sawtooth voltage when the electric signal is maximum, and obtaining a value of the reflection wavelength according to the relation between the sawtooth voltage and the wavelength, thereby achieving the purpose of sensing signal demodulation.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20220026288A1 (en) * | 2020-07-27 | 2022-01-27 | Shanghai Huayi New Material Co., Ltd. | Reactor Temperature Measurement System, Reactor and Method for Preparing a Fiber Bragg Grating |
| CN114235018A (en) * | 2021-12-09 | 2022-03-25 | 山东微感光电子有限公司 | Temperature-adaptive FBG demodulation method and system |
| WO2022127433A1 (en) * | 2020-12-18 | 2022-06-23 | Huawei Technologies Co.,Ltd. | System, method and apparatus for monitoring optical performance |
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