CN114460036A - System and method for detecting redundant substances in low-temperature medium supply system - Google Patents
System and method for detecting redundant substances in low-temperature medium supply system Download PDFInfo
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- 239000000126 substance Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000009413 insulation Methods 0.000 claims abstract description 52
- 238000001514 detection method Methods 0.000 claims abstract description 50
- 230000000007 visual effect Effects 0.000 claims abstract description 32
- 238000005070 sampling Methods 0.000 claims abstract description 23
- 238000003556 assay Methods 0.000 claims abstract description 17
- 238000009530 blood pressure measurement Methods 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 238000004458 analytical method Methods 0.000 claims abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 22
- 230000003287 optical effect Effects 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 10
- 239000004065 semiconductor Substances 0.000 claims description 10
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- 238000001816 cooling Methods 0.000 claims description 3
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- 239000007769 metal material Substances 0.000 claims description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 26
- 238000005259 measurement Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 5
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- 230000001052 transient effect Effects 0.000 description 4
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- 238000000862 absorption spectrum Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 230000008014 freezing Effects 0.000 description 1
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- 238000001285 laser absorption spectroscopy Methods 0.000 description 1
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/85—Investigating moving fluids or granular solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/084—Testing filters
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Abstract
The invention relates to a system and a method for detecting redundant substances in a low-temperature medium supply system, which are used for solving the technical problems that the real-time visual observation of low-temperature and large-caliber pipelines on the redundant substances in a low-temperature medium cannot be realized and the form and the component content of the redundant substances cannot be measured at present. The system comprises one or more of a visual detection system, an online sampling and testing system and a differential pressure measuring system; the visual detection system comprises a double-layer vacuum low-temperature heat insulation pipeline, a camera and a corrugated pipe, wherein the double-layer vacuum low-temperature heat insulation pipeline is communicated with the low-temperature heat insulation pipeline; the online sampling and testing system comprises a drainage catheter communicated with the low-temperature heat-insulating pipeline, a third valve on the drainage catheter, a heater and a content analysis and testing system; the differential pressure measuring system comprises a filter arranged on the low-temperature heat-insulating pipeline and a differential pressure sensor arranged at two ends of the filter. The method comprises one or more of a visual detection method, an online sampling assay detection method and a differential pressure measurement method.
Description
Technical Field
The invention relates to a device for detecting redundant substances in a low-temperature medium, in particular to a system and a method for detecting redundant substances in a low-temperature medium supply system.
Background
In the process of supplying the low-temperature medium, due to factors such as pressurization, mass and heat transfer and the like, redundant substances with different compositions exist in the medium, the redundant substances exist in a floccule state or a solid particle state under low-temperature conditions generally, the redundant substances can affect a flow field in the flowing medium, and in a serious case, the redundant substances can cause blockage of equipment such as a system filter and the like, thereby affecting the safe operation of the whole system. When the system is finished, the redundant substances existing in floccules or solid state melt along with the temperature rise, and the post-test inspection cannot be effectively carried out. In order to effectively detect the redundant substances in the low-temperature medium supply system, the medium flowing state in the pipeline needs to be detected in the running process, and an effective basis for judging the existence of the redundant substances is provided.
At present, no special method and means are available for detecting low-temperature redundant substances in a low-temperature medium, the visual observation requirements of low-temperature (-183 ℃), large-caliber (DN200mm) pipelines cannot be met, the real-time observation of transient redundant substances in the low-temperature medium cannot be realized, whether redundant substances exist or not can be analyzed only through system fault representation, and the system cannot be decomposed to check the existence forms and the component contents of the redundant substances after the faults occur, so that the existence forms and the contents of the redundant substances cannot be really and effectively described.
Disclosure of Invention
The invention aims to solve the technical problems that the existing method can not realize the visual observation requirement of low-temperature and large-caliber pipelines on the redundant substances in a low-temperature medium, can not realize the real-time observation of transient redundant substances in the low-temperature medium and the measurement of the existing forms and component contents of the redundant substances, and provides a system and a method for detecting the redundant substances in a low-temperature medium supply system.
The technical scheme of the invention is as follows:
a system for detecting redundant substances in a low-temperature medium supply system, wherein the low-temperature medium supply system is paved by a low-temperature heat insulation pipeline, a low-temperature medium inlet end and a low-temperature medium outlet end are arranged on the low-temperature medium supply system, and the system is characterized in that: comprises one or more of a visual detection system, an online sampling assay system and a differential pressure measurement system;
the visual detection system comprises a double-layer vacuum low-temperature heat insulation pipeline, a camera and a corrugated pipe, wherein the double-layer vacuum low-temperature heat insulation pipeline is communicated with the low-temperature heat insulation pipeline and comprises an inner-layer low-temperature heat insulation pipeline and an outer-layer low-temperature heat insulation pipeline;
the outer-layer low-temperature heat-insulation pipeline is sleeved outside the observation pipeline and the corrugated pipe; the outer-layer low-temperature heat-insulation pipeline is provided with a first observation window and a second observation window which are sealed, the first observation window is provided with a camera, and the second observation window is provided with a light source;
the online sampling and testing system comprises a drainage catheter communicated with a low-temperature heat insulation pipeline of the low-temperature medium supply system, a third valve arranged on the drainage catheter, a heater arranged at the outlet end of the drainage catheter and a content analysis and testing system;
the differential pressure measuring system comprises a filter arranged on a low-temperature heat insulation pipeline of the low-temperature medium supply system and a differential pressure sensor arranged at two ends of the filter.
Further, the visual detection system, the online sampling and testing system and the differential pressure measurement system are sequentially arranged along the low-temperature heat insulation pipeline in the low-temperature medium supply system.
Visual detection system, online sampling assay system and pressure difference measurement system set gradually along low temperature medium supply system in low temperature medium supply system, through visual observation, online sampling measurement and filter pressure difference measurement, can carry out the multi-coupling interpretation to unnecessary material in the low temperature medium, the result reliability is higher.
Furthermore, the observation pipeline is a quartz glass pipeline, two ends of the quartz glass pipeline are connected with the corrugated pipes, a quartz glass plate is arranged on the side face of the quartz glass pipeline corresponding to the first observation window and the second observation window, and the quartz glass plate is fixed on the side face of the quartz glass pipeline through a flange;
the two ends of the quartz glass pipeline are hermetically connected with the low-temperature heat insulation pipeline through non-metallic materials.
Further, the light source arranged on the second observation window is a cold light source.
The visual detection system adopts a cold light source, and avoids the influence on the accuracy of the test caused by the heating effect of the low-temperature medium by adopting a heat-generating light source.
Further, the content analysis assay system comprises a wavelength tunable semiconductor laser, a photoelectric detector and a data processing system connected with the photoelectric detector;
the wavelength tunable semiconductor laser is used for emitting laser, the photoelectric detector is used for receiving optical signals after passing through a flow field to be measured formed by a low-temperature medium, and the data processing system is used for analyzing the optical signals after passing through the flow field to be measured.
Further, the differential pressure measuring system also comprises a flow meter which is arranged at the rear end of the differential pressure sensor;
and pressure sensors are respectively arranged on two sides of the filter.
The flowmeter can measure the flow change of the low-temperature medium passing through the filter, the measurement data of the flowmeter is stable under normal conditions, and when the detection data of the flowmeter is suddenly reduced, the flow of the low-temperature medium is reduced when the low-temperature medium passes through the filter, and the situation that the filter screen is blocked because redundant substances in the low-temperature medium cannot pass through the filter screen of the filter can be inferred.
The pressure sensors arranged at the two ends of the filter can verify the data accuracy of the differential pressure sensor in the differential pressure measurement system by calculating the differential pressure of the two pressure sensors.
Further, the detection system further comprises a temperature sensor disposed on a cryogenically insulated conduit of the cryogenic medium supply system.
The temperature sensor can be used for judging whether the temperature reaches the detection temperature during precooling, and can also be used for judging the temperature return condition after the detection is finished.
The invention also provides a method for detecting the redundant substances in the low-temperature medium supply system, which is characterized by comprising one or more of a visual detection method, an online sampling assay detection method and a differential pressure measurement method:
the visual detection method comprises the following steps: turning on a light source and a camera, shooting the low-temperature medium flowing in the inner-layer low-temperature heat-insulating pipeline through a first observation window on the outer-layer low-temperature heat-insulating pipeline by the camera, and observing images; if the low-temperature medium is observed to be clear liquid, no redundant substances exist in the low-temperature medium; if the flocculent opaque substances in the low-temperature medium are observed, redundant substances exist in the low-temperature medium;
the online sampling assay detection method comprises the following steps: opening a third valve on the drainage guide pipe, controlling the flow of a low-temperature medium in the drainage guide pipe, converting redundant substances in the low-temperature medium into a gas state after the low-temperature medium passes through a heater to form a flow field to be detected, emitting laser to the flow field to be detected by using a wavelength tunable semiconductor laser, receiving an optical signal after the laser passes through the flow field to be detected by a photoelectric detector, and transmitting the optical signal to a data processing system for data analysis; judging whether redundant substances exist in the low-temperature medium or not and the types and the contents of the redundant substances according to the analysis result;
the differential pressure measuring method comprises the following steps: starting a differential pressure sensor, measuring and outputting the pressure difference at two ends of the filter in real time by the differential pressure sensor when the low-temperature medium flows through the filter, judging whether redundant substances exist in the low-temperature medium according to the pressure difference at the two ends of the filter, and if the fluctuation range of the pressure difference is less than 2%, determining that the redundant substances do not exist in the low-temperature medium; if the fluctuation range of the pressure difference is more than 2 percent, redundant substances exist in the low-temperature medium.
Further, the method for detecting the redundant substances in the low-temperature medium supply system comprises a visual detection method, an online sampling assay detection method and a differential pressure measurement method which are sequentially carried out.
Further, before the detection of the redundant substances, precooling of a low-temperature heat insulation pipeline of the low-temperature medium supply system is also included, and the precooling process comprises the following steps:
s1, introducing a low-flow low-temperature medium from a low-temperature medium inlet end of the low-temperature heat insulation pipeline, and pre-cooling the low-flow low-temperature medium flowing out from a low-temperature medium outlet end of the low-temperature heat insulation pipeline;
s2, observing a low-temperature medium flowing in the low-temperature heat insulation pipeline through a visual detection method, wherein if bubbles are generated in the low-temperature medium flowing in the low-temperature heat insulation pipeline, the temperature of the pipeline does not reach the detection temperature, and if bubbles are not generated in the low-temperature medium flowing in the low-temperature heat insulation pipeline, the temperature of the pipeline reaches the detection temperature;
and/or judging whether the detected temperature is reached through the indication temperature of a temperature sensor arranged on a low-temperature heat-insulating pipeline of the low-temperature medium supply system.
The invention has the beneficial effects that:
1. the visual detection system provided by the invention can realize visual observation of the low-temperature (-183 ℃) large-caliber (DN200mm) low-temperature heat-insulating pipeline, and can observe whether redundant substances exist in a low-temperature medium flowing in the heat-insulating pipeline in real time; the content of redundant substances in the low-temperature medium can be measured by the online sampling assay system; the filter pressure drop value in the low-temperature medium supply system can be detected through the differential pressure measurement system, and the influence degree of the redundant substances on the low-temperature medium supply system is further judged; in addition, one or more detection systems can be selected for use according to needs, the practicability is high, and the application scene is wider.
2. The method for detecting the redundant substances in the low-temperature medium supply system has corresponding advantages.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a system for detecting unwanted substances in a cryogenic medium supply system according to the present invention;
FIG. 2 is a schematic structural diagram of a visual inspection system according to an embodiment of the present invention;
FIG. 3 is a schematic view showing a differential pressure measurement result of one differential pressure sensor of the differential pressure measurement method according to the embodiment of the present invention;
fig. 4 is a schematic view of a differential pressure measurement result of another differential pressure sensor of the differential pressure measurement method in the embodiment of the present invention.
The reference numbers are as follows:
1-visual detection system, 11-first observation window, 12-second observation window, 13-double-layer vacuum low-temperature heat insulation pipeline, 14-outer-layer low-temperature heat insulation pipeline, 15-first corrugated pipe, 16-second corrugated pipe, 17-quartz glass pipeline, 18-quartz glass plate, 2-online sampling assay system, 21-content analysis assay system, 22-third valve, 23-drainage conduit, 24-low-temperature endoscope, 3-differential pressure measurement system, 31-filter, 32-differential pressure sensor, 33-pressure sensor, 34-flowmeter, 4-low-temperature medium inlet end, 5-low-temperature medium outlet end, 6-third corrugated pipe, 7-temperature sensor, 8-first valve, 9-second valve, 10-low temperature insulation pipeline.
Detailed Description
Referring to fig. 1 and 2, the present embodiment provides a system for detecting unwanted substances in a cryogenic medium supply system, the cryogenic medium supply system being constructed by laying a cryogenic insulation pipe 10, the cryogenic insulation pipe 10 having a function of maintaining a cryogenic state of the pipe, the cryogenic insulation pipe 10 including a cryogenic medium inlet end 4 and a cryogenic medium outlet end 5.
In this embodiment, the first valve 8, the second valve 9, the plurality of third bellows 6, the observation port of the low-temperature endoscope 24, and the temperature sensor 7 are provided in the low-temperature heat insulation pipe 10, and the third bellows 6 can expand and bend to a certain extent when the temperature changes, and bear a certain pressure, thereby compensating for the low-temperature deformation of the stainless steel pipe.
The system for detecting the redundant substances in the low-temperature medium supply system further comprises a visual detection system 1, an online sampling and testing system 2 and a differential pressure measurement system 3 which are sequentially arranged.
The visual detection system 1 comprises a double-layer vacuum low-temperature heat insulation pipeline 13, a high-speed camera and a light source, wherein the double-layer vacuum low-temperature heat insulation pipeline 13 comprises an inner-layer low-temperature heat insulation pipeline and an outer-layer low-temperature heat insulation pipeline 14, the inner-layer low-temperature heat insulation pipeline is communicated with the low-temperature heat insulation pipeline 10, a transparent observation pipeline is arranged on the inner-layer low-temperature heat insulation pipeline, corrugated pipes are arranged at two ends of the observation pipeline, and each corrugated pipe comprises a first corrugated pipe 15 and a second corrugated pipe 16.
The outer-layer low-temperature heat-insulating pipeline 14 consists of three sections of stainless steel metal cylinders which are hermetically connected through flanges, and the outer-layer low-temperature heat-insulating pipeline 14 is sleeved outside the observation pipeline, the first corrugated pipe 15 and the second corrugated pipe 16; be provided with sealed first observation window 11 and second observation window 12 on the interlude of outer low temperature adiabatic pipeline 14, first observation window 11 and the symmetry setting of second observation window 12, during the use, set up high-speed camera at first observation window 11, second observation window 12 sets up the light source and realizes visual detection, and this light source is cold light source, prevents that heat production light source from to low temperature medium heating, influence measuring result.
Specifically, the observation pipeline is a quartz glass pipeline 17, two ends of the quartz glass pipeline 17 are connected with a first corrugated pipe 15 and a second corrugated pipe 16, the first corrugated pipe 15 and the second corrugated pipe 16 are connected with the low-temperature heat insulation pipeline 10 through non-metal flanges, a quartz glass plate 17 is arranged on the side surface of the quartz glass pipeline 17 corresponding to the first observation window 11 and the second observation window 12, and the quartz glass plate 17 is fixed on the outer side surface of the quartz glass pipeline 17 through flanges. The first corrugated pipe 15 and the second corrugated pipe 16 can realize certain degree of expansion and bending when the temperature changes, bear certain pressure, can be used for compensating the low-temperature deformation of the stainless steel pipeline, prevent the quartz glass from being broken at low temperature due to the fact that the transparent observation pipe is extruded by the low-temperature deformation of the stainless steel pipeline, and can play a role in protecting the quartz glass pipeline 17.
The online sampling and testing system 2 comprises a drainage conduit 23 communicated with the low-temperature heat-insulating pipeline 10 of the low-temperature medium supply system, a third valve 22 arranged on the drainage conduit 23, a heater arranged at the outlet end of the drainage conduit 23 and a content analysis and testing system 21; the content analysis and assay system 21 comprises a wavelength tunable semiconductor laser, a photoelectric detector and a data processing system connected with the photoelectric detector; the wavelength tunable semiconductor laser is used for emitting laser, the photoelectric detector is used for receiving optical signals passing through a flow field to be measured, and the data processing system is used for collecting and analyzing the optical signals passing through the flow field to be measured.
The differential pressure measuring system 3 includes a filter 31 provided on the low-temperature heat insulating pipe 10 of the low-temperature medium supply system, a differential pressure sensor 32 provided at both ends of the filter 31, two pressure sensors 33 provided at both sides of the differential pressure sensor 32, and a flow meter 34, the flow meter 34 being provided at a rear end of the filter 31.
Based on the system for detecting the excess substance in the low-temperature medium supply system provided by the embodiment, the excess substance CO in the liquid oxygen supply system is measured2And H2The working process of the excess substance detection system is illustrated by an example of the working process of the O distribution state.
Since the liquid oxygen is-183 ℃ and CO is2Boiling point of-78.46 deg.C, H 20 freezing point of 0 ℃ so that H in liquid oxygen2O and CO2All exist in a solid state, and when the liquid oxygen supply system is warmed, the shape and distribution of redundant substances in the medium cannot be observed.
The specific working process is as follows:
(1) pre-cooling of the low-temperature heat-insulating pipeline 10 in the liquid oxygen supply system: the first valve 8 and the second valve 9 are opened, liquid oxygen is adjusted to be small in flow to pre-cool the low-temperature heat-insulation pipeline 10, and whether the temperature is pre-cooled to the detection temperature is determined by a visual detection method in a mode of observing combination of bubbles and the temperature sensor 7, namely-183 ℃.
Specifically, the liquid oxygen flowing in the low-temperature heat-insulating pipeline 10 is observed by a visual detection method, if bubbles are generated in the liquid oxygen flowing in the low-temperature heat-insulating pipeline 10, the pipeline temperature does not reach the detection temperature, and if bubbles are not generated in the liquid oxygen flowing in the low-temperature heat-insulating pipeline 10, the temperature of the low-temperature heat-insulating pipeline 10 reaches the detection temperature; meanwhile, whether the low temperature heat insulation pipeline 10 reaches the detection temperature is judged according to the indication temperature of the temperature sensor 7 arranged on the low temperature heat insulation pipeline 10 of the liquid oxygen supply system.
(2) After precooling is finished, firstly, the liquid oxygen passes through the visual detection system 1, a cold light source and a high-speed camera are turned on, and the high-speed camera carries out image observation on the liquid oxygen flowing in the low-temperature heat-insulation pipeline 10 through an observation pipeline; if the low-temperature medium is observed to be clear liquid, no redundant substances exist in the low-temperature medium; if a cloudy or solid opaque material is observed in the cryogenic medium, there is excess material in the cryogenic medium. The method can realize the visual observation of the low-temperature medium with the temperature higher than-196 ℃ under the pressure of the observation pipeline of 1 MPa.
Then, the liquid oxygen passes through an on-line sampling and testing system 2, and the excessive substance CO is sampled in advance2And H2Loading the characteristic spectrum line information of O into a data processing system, opening a third valve 22 on a drainage catheter 23, controlling the flow of liquid oxygen in the drainage catheter 23, and after the liquid oxygen passes through a heater, redundant substances CO in the liquid oxygen2And H2And O is converted into a gas state to form a flow field to be detected, the wavelength tunable semiconductor laser is used for emitting laser to the flow field to be detected, and an optical signal generated after the laser passes through the flow field to be detected is received by the photoelectric detector and is transmitted to the data processing system for data analysis.
Specifically, the present embodiment adopts a tunable laser absorption spectroscopy technology, and the principle thereof is as follows: different surplus substance molecules can generate transition at a specific frequency, when a beam of laser passes through a flow field to be detected, if the frequency of the laser is the same as the transition frequency of the gas molecules, light is absorbed by the gas molecules and generates a strong light attenuation effect, a wavelength-tunable semiconductor laser with high resolution is used for emitting the laser, a high-resolution absorption spectrum of target gas in an optical signal passing through the flow field to be detected is obtained through a photoelectric detector, concentration information of components of the target gas can be inverted on line through a data acquisition and analysis system, the content of surplus substances in liquid oxygen is pre-judged in advance, the content of the surplus substances in the liquid oxygen is analyzed through a characteristic spectrum of the surplus substances, and the time law of the distribution of the surplus substances is synchronously obtained. Because the tunable laser absorption spectrum technology can only carry out gaseous molecular measurement, the excessive substances to be measured by the method are transient excessive substances in a low-temperature supply system, and the common excessive substances H2O and CO2At low temperature (-183 deg.C below), the product can only exist in floccule or solid state, and cannot be measured by spectral measurement techniqueThe measurement of the components of the redundant substances is realized, so that the liquid oxygen needs to be led out through a conduit, heated by a vaporizer and converted into a gaseous state for measurement, and the content parameters of the redundant substances can be obtained.
Finally, the liquid oxygen passes through the differential pressure measuring system 3, the differential pressure sensor 32 is started, and when the liquid oxygen passes through the filter 31, the differential pressure sensor 32 measures and outputs the pressure difference between the two ends of the filter 31 in real time. Specifically, when no unnecessary substances exist in the system, the pressure difference value of the liquid oxygen before and after the filter 31 fluctuates by less than 2%, when the unnecessary substances appear in the system, the unnecessary substances are adsorbed on the filter 31, the filter screen is blocked, the flow area is reduced, the flow resistance is increased, and the pressure difference of the liquid oxygen at the front end and the rear end of the filter 31 is increased, when the monitoring is carried out, if the fluctuation range of the pressure difference between the two ends of the filter 31 is more than 2%, the shape and the size of the unnecessary substances in the liquid oxygen exceed the minimum pore size of the filter 31, and the existence of the unnecessary substances in the liquid oxygen is judged.
In the embodiment, two differential pressure sensors 32 are provided for redundancy, so that one differential pressure sensor 32 is prevented from being failed, and the other differential pressure sensor 32 can continue to measure, and two pressure sensors 33 are provided on two sides of the differential pressure sensor 32 to be used as reference data for verifying the measurement data of the differential pressure sensor 32.
The low-temperature endoscope 24 can inspect the excessive substance H inside the pipeline through the observation port of the low-temperature endoscope 24 on the low-temperature heat insulation pipeline 10 after the liquid oxygen supply system is cooled back to-40 ℃ to-30 DEG C2O and CO2The state of (1).
Referring to fig. 3 and 4, comparing the measured data of the two differential pressure sensors 32, it can be seen that in the later stage of the test, a transient pressure rise occurs, which indicates that there is an excess substance in the system and affects the flow state of the filter 31, resulting in an increase in the flow resistance of the pipeline, and the analysis result of the online sampling assay detection method is combined to display the CO in liquid oxygen in the same period of time2The content is obviously increased, which indicates that redundant substances exist in the liquid oxygen, and the real-time detection result is true and effective.
Claims (10)
1. A system for detecting unwanted substances in a cryogenic medium supply system, said cryogenic medium supply system being laid by a cryogenic insulated pipeline (10), said cryogenic medium supply system being provided with a cryogenic medium inlet end (4) and a cryogenic medium outlet end (5), characterized in that: comprises one or more of a visual detection system (1), an online sampling assay system (2) and a differential pressure measurement system (3);
the visual detection system (1) comprises a double-layer vacuum low-temperature heat insulation pipeline (13), a camera and a corrugated pipe, wherein the double-layer vacuum low-temperature heat insulation pipeline (13) comprises an inner-layer low-temperature heat insulation pipeline and an outer-layer low-temperature heat insulation pipeline (14), the inner-layer low-temperature heat insulation pipeline is communicated with the low-temperature heat insulation pipeline (10), a transparent observation pipeline is arranged on the inner-layer low-temperature heat insulation pipeline, and the corrugated pipe is arranged at two ends of the observation pipeline;
the outer-layer low-temperature heat-insulating pipeline (14) is sleeved outside the observation pipeline and the corrugated pipe; the outer-layer low-temperature heat-insulation pipeline (14) is provided with a first observation window (11) and a second observation window (12) which are sealed, the first observation window (11) is provided with a camera, and the second observation window (12) is provided with a light source;
the online sampling and testing system (2) comprises a drainage conduit (23) communicated with the low-temperature heat-insulating pipeline (10), a third valve (22) arranged on the drainage conduit (23), a heater arranged at the outlet end of the drainage conduit (23) and a content analysis and testing system (21);
the differential pressure measuring system (3) comprises a filter (31) arranged on a low-temperature heat-insulating pipeline (10) of the low-temperature medium supply system and differential pressure sensors (32) arranged at two ends of the filter (31).
2. The system for detecting unwanted substances in a cryogenic medium supply system according to claim 1, wherein: the visual detection system (1), the online sampling and testing system (2) and the differential pressure measurement system (3) are sequentially arranged along a low-temperature heat insulation pipeline (10) in the low-temperature medium supply system.
3. The system for detecting unwanted substances in a cryogenic medium supply system according to claim 1 or 2, wherein: the observation pipeline is a quartz glass pipeline (17), two ends of the quartz glass pipeline (17) are connected with corrugated pipes, quartz glass plates (18) are arranged on the side surfaces of the quartz glass pipeline (17) corresponding to the first observation window (11) and the second observation window (12) respectively, and the quartz glass plates (18) are fixed on the outer side surface of the quartz glass pipeline (17) through flanges;
the two ends of the quartz glass pipeline (17) are hermetically connected with the low-temperature heat-insulating pipeline (10) through non-metallic materials.
4. The system according to claim 3, wherein the system comprises: the light source arranged on the second observation window (12) is a cold light source.
5. The system according to claim 4, wherein the system comprises: the content analysis assay system (21) comprises a wavelength tunable semiconductor laser, a photoelectric detector and a data processing system connected with the photoelectric detector;
the wavelength tunable semiconductor laser is used for emitting laser, the photoelectric detector is used for receiving optical signals passing through a flow field to be detected, and the data processing system is used for analyzing the optical signals passing through the flow field to be detected.
6. The system according to claim 5, wherein the system further comprises: the differential pressure measuring system (3) further comprises a flow meter (34), and the flow meter (34) is arranged close to the outlet end (5) of the low-temperature medium;
and pressure sensors (33) are respectively arranged on two sides of the filter (31).
7. The system according to claim 6, wherein the system further comprises: the device also comprises a temperature sensor (7) arranged on a low-temperature heat-insulating pipeline (10) of the low-temperature medium supply system.
8. A method for detecting redundant substances in a low-temperature medium supply system is characterized in that: comprises one or more of a visual detection method, an online sampling assay detection method and a differential pressure measurement method;
the visual detection method comprises the following steps: turning on a light source and a camera, shooting the low-temperature medium flowing in the inner-layer low-temperature heat-insulating pipeline by the camera through the outer-layer low-temperature heat-insulating pipeline (14), and observing images; if the low-temperature medium is observed to be clear liquid, no redundant substances exist in the low-temperature medium; if flocculent opaque substances are observed in the low-temperature medium, redundant substances exist in the low-temperature medium;
the online sampling assay detection method comprises the following steps: opening a third valve (22) on the drainage guide pipe (23), controlling the flow of a low-temperature medium in the drainage guide pipe (23), converting redundant substances in the low-temperature medium into a gas state after the low-temperature medium passes through a heater to form a flow field to be detected, emitting laser to the flow field to be detected by using a wavelength tunable semiconductor laser, and receiving an optical signal of the laser after passing through the flow field to be detected by a photoelectric detector and transmitting the optical signal to a data processing system for data analysis; judging whether redundant substances exist in the low-temperature medium or not and the types and the contents of the redundant substances according to the analysis result;
the differential pressure measuring method comprises the following steps: starting a differential pressure sensor (32), when the low-temperature medium flows through the filter (31), measuring and outputting the pressure difference at two ends of the filter (31) in real time by the differential pressure sensor (32), judging whether redundant substances exist in the low-temperature medium according to the pressure difference at two ends of the filter, and if the fluctuation range of the pressure difference is less than 2%, judging that the redundant substances do not exist in the low-temperature medium; if the fluctuation range of the pressure difference is more than 2 percent, redundant substances exist in the low-temperature medium.
9. The method of claim 8, wherein the method further comprises the steps of: comprises a visual detection method, an on-line sampling assay detection method and a differential pressure measurement method which are sequentially carried out.
10. The method of claim 9, wherein the method further comprises the steps of: the method also comprises the precooling of a low-temperature heat-insulating pipeline (10) of the low-temperature medium supply system, wherein the precooling process comprises the following steps:
s1, introducing a low-flow low-temperature medium from a low-temperature medium inlet end (4) of the low-temperature heat insulation pipeline (10), and pre-cooling the low-flow low-temperature medium flowing out from a low-temperature medium outlet end (5) of the low-temperature heat insulation pipeline (10);
s2, observing a low-temperature medium flowing in the low-temperature heat-insulating pipeline (10) through a visual detection method, wherein if the low-temperature medium flowing in the low-temperature heat-insulating pipeline (10) generates bubbles, the pipeline temperature does not reach the detection temperature, and if the low-temperature medium flowing in the low-temperature heat-insulating pipeline (10) does not generate bubbles any more, the pipeline temperature reaches the detection temperature;
and/or whether the detected temperature is reached is judged by the indicated temperature of a temperature sensor (7) arranged on a low-temperature heat-insulating pipeline (10) of the low-temperature medium supply system.
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