CN112051231A - Method and device for preventing water from entering optical cavity ring-down closed-loop flux analyzer - Google Patents
Method and device for preventing water from entering optical cavity ring-down closed-loop flux analyzer Download PDFInfo
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- G01N1/40—Concentrating samples
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- G—PHYSICS
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- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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Abstract
The invention discloses a method and a device for preventing water from entering an optical cavity ring-down closed-loop flux analyzer, and relates to the field of optical cavity ring-down closed-loop flux analysis, comprising a cabinet body and a support frame, wherein the support frame is positioned at one side of the cabinet body, a high vacuum air pump and an auxiliary pump are respectively arranged below the inner part of the cabinet body, the tops of the high vacuum air pump and the auxiliary pump are provided with an extension socket, the top of the extension socket is provided with a gas concentration analyzer, the device adopts a double-pump air inlet structure, high-speed sample introduction is adopted, high-frequency attenuation caused by long gas path sampling is reduced, a specially-made rain-proof and mosquito-proof air inlet can prevent detection interference, automatically-controlled gas path blowing can respond in millisecond level, gas path water entering caused by sea wave beating can be prevented in ocean application, the drying efficiency of sample gas of the device is more than 90%, the high-frequency, the gas circuit delay can be accurately measured by timing multiple times of high-pressure zero gas pulses, so that the precision of a detection result is improved.
Description
Technical Field
The invention relates to the technical field of cavity ring-down closed-loop flux analysis, in particular to a method and a device for preventing water from entering an optical cavity ring-down closed-loop flux analyzer.
Background
Ocean CO2、CH4The vortex related measurement technology of the equal greenhouse gas flux is an effective means for the development and verification of a sea-air exchange model and the research of ocean carbon cycle. The results of over a decade of published paper illustrate the major interference of moisture and motion, revealing experimental methods to improve measurement accuracy and precision. Water vapor cross-sensitivity is the largest source of error in measuring carbon dioxide flux using infrared gas analyzers (IRGAs), and typically results in a ten-fold deviation in the measured carbon dioxide flux. As previously envisaged, most of the errors are independent of optical contamination. While various calibration schemes have been demonstrated, the use of air dryers and closed loop gas analyzers is the most effective way to eliminate this interference. This method also avoids the density correction described by Webb et al (Webbeta. 1980). For cavity ring-down analyzers (CRDS) and air dryers passing through 60m air inlet tube, flux correction showed attenuation<5 percent. The flux detection limit estimated by the CRDS analyzer plus air dryer system is ten times better than that of the infrared gas analyzer when wet air is sampled. There have been published protocols for drying in IRGAs closed-loop flux systems. However, the special design of the pressure control of the CRDS analyzer is bound to be different from the air inlet design of the IRGAs system, and no publication is found.
The signal lag and frequency response of the existing optical cavity ring-down closed-circuit flux analyzer are common problems of all closed-circuit flux systems, particularly when the structure of a gas circuit is complex, how to accurately measure the signal lag time and the frequency decay time is very complex, and the closed-circuit gas analyzer is used for measuring by pumping air and entering the analyzer, when the closed-circuit gas analyzer is applied to the ocean, the gas circuit is likely to be influenced by sea waves and rainstorm to cause water to enter the gas circuit, and if the water enters the optical cavity, the gas analyzer is seriously damaged.
Disclosure of Invention
The invention aims to provide a method and a device for preventing water from entering an optical cavity ring-down closed-circuit flux analyzer, so as to solve the problems that the gas analyzer is damaged due to the fact that the lag time and the frequency attenuation time of signals are accurately measured and calculated and the air pumping water of the analyzer enters the analyzer in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a prevent that light cavity from declining to swing closed circuit flux analysis appearance into water device, includes the cabinet body, zero gas high-pressure gas jar, air compressor machine and support frame, first support and second support are installed respectively to one side of support frame, install solenoid valve one on the second support, just solenoid valve one is connected with zero gas high-pressure gas jar through the outlet duct, install high-low pressure table and flowmeter one on the outlet duct respectively, install the intake pipe on the first support, intake pipe one end is connected with stainless steel pipe one end through the three-way valve, and the other end is connected to the three-way valve between solenoid valve two and the large-traffic filter, the stainless steel pipe other end is connected with the air inlet, and the junction has cup jointed O type circle, the air compressor machine is installed through the connecting pipe to one side of the cabinet body, high vacuum air pump and auxiliary pump are installed respectively to the inside below of the cabinet, gas concentration analysis appearance is installed at the top of row's inserting, the inside of the cabinet body is installed display, interchange directly charge controller, the control unit, large-traffic filter and water detector respectively, air dryer is installed to the bottom of display, the electromagnetism valves is installed to one side of display.
Preferably, the air inlet contains 3D and prints structure, filter screen support, fastening screw and O type circle, 3D prints the inside of structure and is provided with the filter screen support, filter screen support bottom is provided with the filter screen, the bottom of nonrust steel pipe is passed through fastening screw and is printed the structure with 3D and fix.
Preferably, the electromagnetic valve group consists of 4 electromagnetic valves, namely an electromagnetic valve II, an electromagnetic valve III, an electromagnetic valve IV and an electromagnetic valve V, and the electromagnetic valve II is connected with the air compressor.
Preferably, the stainless steel pipe has an inner diameter of 9 mm.
Preferably, the inner diameters of the air inlet pipe and the air outlet pipe are 9 mm.
Preferably, the control unit is electrically connected with the display, the alternating current-to-direct current charging controller, the first electromagnetic valve bank, the large-flow filter, the water detector, the high vacuum air pump, the auxiliary pump and the gas concentration analyzer respectively.
Preferably, the length of the pipeline between the first electromagnetic valve and the three-way valve is equal to the length of the pipeline from the air inlet to the three-way valve.
Preferably, a manual valve is arranged between the gas concentration analyzer and the high vacuum air pump, and the manual valve is in a normally closed state and is used for balancing air pressure. When the system is powered off, the gas concentration analyzer is in a vacuum state to the high-vacuum air pump, and if the air pressure is not balanced, water vapor in the air dryer can continuously permeate into the vacuum pipeline, so that water is accumulated in the high-vacuum air pump.
Preferably, the first and second liquid crystal materials are,
step 2, the second electromagnetic valve and the third electromagnetic valve are straight-through electromagnetic valves, the second electromagnetic valve is in a normally closed state, the third electromagnetic valve is in a normally open state, the fourth electromagnetic valve and the fifth electromagnetic valve are three-way electromagnetic valves and are in a straight-through normally open state, the electromagnetic valve group consisting of the 4 electromagnetic valves is used for preventing water from entering a gas path, when the water detector detects that the water enters the gas path, the water is fed back to the control unit, the control unit responds at the speed of 100ms, the working states of the 4 electromagnetic valves are switched simultaneously, the second electromagnetic valve is opened, the third electromagnetic valve is closed, the working gas paths of the fourth electromagnetic valve and the fifth electromagnetic valve are switched from the gas inlet to the gas inlet from the inside of the cabinet body to prevent damage to internal gas path equipment, the large-flow filter at the front end of the third electromagnetic valve filters the entering gas and can prevent the water from entering the third electromagnetic valve, meanwhile, in order to avoid that the high-frequency electromagnetic valve is repeatedly switched on and off to carry out water inlet and back flushing, the control unit can enable each flushing process to last for 5 minutes, if no water exists in the subsequent detection gas circuit, the gas circuit can be automatically switched back to the initial state, and if water still exists in the gas circuit, the flushing is continued, so that the stability and sustainability of the system are ensured;
3, when the air inlet pipeline with closed flux is long, and the pressure control technology of the gas concentration analyzer has great limitation on the air channel speed of the high-vacuum air pump, great pipeline delay can be caused, even the physical structure of turbulence can be changed, in order to ensure that the atmosphere enters the gas concentration analyzer in the form of turbulence, the Reynolds number of the air flow in the pipeline is required to be more than 2000, so that an auxiliary pump is required to be added for rapidly pumping the air flow from an air inlet and then pumping the air flow to the gas concentration analyzer, the pumping speed of the auxiliary pump is 20SLPM, the Reynolds number is corresponding to the pipeline with the inner diameter of 9mm, the Reynolds number is 2800 when the ambient temperature is 26 ℃, namely the turbulence property of the atmosphere is reserved in the air channel, the gas concentration analyzer only needs the air flow of about 5SLPM, the redundant air flow of 15SLPM is discharged through a manual control valve, and the discharged flow rate is controlled through a flow meter II;
step 4, before the air current enters the gas concentration analyzer, the air to be detected is dried through an air dryer, after the air current passes through the gas concentration analyzer, the air current is introduced into an outer tube of the air dryer through a backflow method, and the air pressure ratio between the front of the gas concentration analyzer and the back of the gas concentration analyzer is about 5: and 1, discharging the water to the atmosphere through a high-vacuum air pump, and preventing the water from entering a measuring pipeline to damage equipment through the steps, and simultaneously accurately measuring related data.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention has longer inlet pipeline of closed-circuit flux, and the pressure control technology of the gas concentration analyzer has great restriction to the gas path speed of the high vacuum gas pump, which can cause great pipeline delay, even can change the physical structure of turbulence, in order to ensure that the atmosphere enters the gas concentration analyzer in the form of turbulence, the Reynolds number of the gas flow in the pipeline is more than 2000, therefore, an auxiliary pump is needed to be added for rapidly pumping the gas flow from the gas inlet and then pumping the gas flow to the gas concentration analyzer, the pumping speed of the auxiliary pump is 20SLPM, the Reynolds number is corresponding to the pipeline with the inner diameter of 9mm, the temperature is 2800 when the ambient temperature is 26 ℃, namely the turbulence property of the atmosphere is reserved in the gas path, the gas concentration analyzer only needs the gas flow of about 5SLPM, the redundant gas flow of 15SLPM is discharged through a manual control valve, and the flow discharged by the flow meter II, aiming at the double-pump gas inlet structure of the optical cavity ring-down closed-circuit gas analyzer, high-speed sample introduction is realized, and high-frequency attenuation caused by long gas path sampling is reduced;
2. the invention sets a water detector and an air compressor, when the water detector detects that water enters the air path, the water is fed back to a control unit, the control unit responds at a speed of 100ms, the working states of 4 electromagnetic valves are switched simultaneously, the second electromagnetic valve is opened, the third electromagnetic valve is closed, the working air paths of the fourth electromagnetic valve and the fifth electromagnetic valve are switched from an air inlet to air inlet from the interior of a cabinet body, the internal air path equipment is prevented from being damaged, a large-flow filter at the front end of the third electromagnetic valve filters the entering air and can prevent water from entering the third electromagnetic valve, after the second electromagnetic valve is opened, high-pressure air flow of 0.7MPa of the air compressor can instantly back blow water in the air path out of the air inlet, and simultaneously, in order to avoid the high-frequency repeated switching of the electromagnetic valves for back blowing of water inlet, the control unit can lead each blowing process to last 5 minutes, and if, if water still exists in the gas path, the purging is continued, and the stability and sustainability of the system are ensured; the special rain-proof and mosquito-proof air inlet can prevent detection interference, the millisecond-level response of the arranged water detector can automatically control air channel blowing, and the air channel air inlet can prevent sea waves from beating to cause water inlet in ocean application;
3. according to the invention, the air dryer is arranged at the front section of the gas concentration analyzer, when gas flow enters the gas concentration analyzer, the gas to be detected is dried by the air dryer, and after the gas flow passes the gas concentration analyzer, the gas flow is introduced into the outer tube of the air dryer by adopting a backflow method, wherein the gas pressure ratio between the gas flow entering the gas concentration analyzer and the gas flow leaving the gas concentration analyzer is about 5: 1, then the air is discharged to the atmosphere through a high vacuum air pump, the air flow of the outer pipe for drying is 5 times of the speed of the wet air flow of the inner pipe in the mode, the actual measurement achieves the dehumidification effect which can be compared favorably with the effect of back blowing with 2-3 times of speed by using dry air with the dew point of-40 ℃, and the drying efficiency of the sample gas is>90% high frequency water vapor pulsation suppression>95 percent, effectively reducing the crosstalk of water vapor to other trace gas absorption spectrums; when the ambient dew point is about 20 ℃, the dew point after drying is less than-15 ℃, and at the drying level, the moisture is opposite to CO2The spectrum crosstalk effect and the concentration effect of the trace gas can be ignored;
4. the gas circuit delay can be measured by timing the release of multiple high-pressure zero gas pulses, so that test data can be compensated more accurately, and manual release is supported.
Drawings
FIG. 1 is a schematic view of the structural principle of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a schematic cross-sectional view of the present invention;
FIG. 4 is a schematic view of the structure of the air inlet of the present invention;
FIG. 5 is a schematic cross-sectional view of an air inlet according to the present invention.
In the figure: 1. a cabinet body; 2. a zero-gas high-pressure gas tank; 3. an air compressor; 4. a high-low pressure meter; 5. a support frame; 6. a first electromagnetic valve; 7. a first bracket; 8. a second bracket; 9. a connecting pipe; 10. a display; 11. a high vacuum air pump; 12. arranging and inserting; 13. a gas concentration analyzer; 14. an auxiliary pump; 15. a first flowmeter; 16. a three-way valve; 17. an AC-to-DC charging controller; 18. a control unit; 19. an air dryer; 20. an electromagnetic valve group; 21. a high flow filter; 22. a water detector; 23. an air inlet; 24. fastening screws; 25. an O-shaped ring; 26. a stainless steel tube; 27. a filter screen; 28. a filter screen bracket; 29. 3D printing the structure; 30. an air inlet pipe; 31. and an air outlet pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
In the present invention, unless otherwise expressly stated or limited, the terms "disposed," "mounted," "connected," "secured," "sleeved," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the two elements can be directly connected or indirectly connected through an intermediate medium, and the two elements can be communicated with each other or the two elements can interact with each other, so that the specific meaning of the terms in the invention can be understood according to specific situations by a person skilled in the art.
Referring to fig. 1-5, the present invention provides a technical solution: the utility model provides a prevent that light cavity ring down closed circuit flux analysis appearance is intake device, includes the cabinet body 1, zero gas high pressure gas jar 2, air compressor machine 3 and support frame 5, first support 7 and second support 8 are installed respectively to one side of support frame 5, install solenoid valve 6 on the second support 8, just solenoid valve 6 is connected with zero gas high pressure gas jar 2 through outlet duct 31, install high low-pressure gauge 4 and flowmeter 15 on the outlet duct 31 respectively, install intake pipe 30 on the first support 7, intake pipe 30 one end is connected with stainless steel pipe 26 one end through three-way valve 16, and the other end is connected to the three-way valve between the two and large-traffic filter of solenoid valve, the stainless steel pipe 26 other end is connected with air inlet 23, and the junction has cup jointed O type circle 25, air compressor machine 3 is installed through connecting pipe 9 to one side of the cabinet body 1, high vacuum air pump 11 and auxiliary pump 14 are installed respectively to the inside below of the cabinet body, high vacuum air pump 11 and auxiliary pump 14's top is provided with row and inserts 12, arrange and insert 12's top and install gas concentration analysis appearance 13, display 10, the straight charge controller 17 of interchange, the control unit 18, large-traffic filter 21 and water detector 22 are installed respectively to the inside of the cabinet body 1, air dryer 19 is installed to the bottom of display 10, electromagnetism valves 20 is installed to one side of display 10.
Further, please refer to fig. 1-5, the air inlet 23 includes a 3D printing structure 29, a filter screen 27, a filter screen bracket 28, a fastening screw 24 and an O-ring 25, the filter screen bracket 28 is disposed inside the 3D printing structure 29, the filter screen 27 is disposed at the bottom of the filter screen bracket 28, the bottom of the stainless steel pipe 26 is fixed to the 3D printing structure 29 through the fastening screw 24, and the special rainproof and anti-mosquito air inlet can prevent excessive impurities from entering.
Further, referring to fig. 1 and 3, the electromagnetic valve group 20 is composed of 4 electromagnetic valves, namely an electromagnetic valve two, an electromagnetic valve three, an electromagnetic valve four and an electromagnetic valve five, and controls the air path back flushing and the air path switching to the analyzer through the plurality of electromagnetic valves.
Further, referring to fig. 1 to 5, the second electromagnetic valve is connected to the air compressor 3, the inner diameter of the stainless steel pipe 26 is 9mm, and the inner diameters of the air inlet pipe 30 and the air outlet pipe 31 are 9 mm.
Further, referring to fig. 1 to 5, the control unit 18 is electrically connected to the display 10, the ac-dc charging controller 17, the first electromagnetic valve 6, the first electromagnetic valve set 20, the large flow filter 21, the water detector 22, the high vacuum air pump 11, the auxiliary pump 14, and the gas concentration analyzer 13, respectively, further, the length of the pipeline between the first electromagnetic valve 6 and the three-way valve 16 is equal to the length of the pipeline from the air inlet 23 to the three-way valve 16, and the time for the high pressure zero gas to reach the analyzer is consistent with the time for the atmosphere to reach the analyzer.
Further, referring to fig. 1, a manual valve is disposed between the gas concentration analyzer 13 and the high vacuum air pump 11, and the manual valve is in a normally closed state and is used for balancing air pressure. When the system is powered off, the gas concentration analyzer 13 is in a vacuum state to the high vacuum air pump 11, and if the air pressure is not balanced, water vapor in the air dryer 19 continuously permeates into a vacuum pipeline, so that water is accumulated in the high vacuum air pump 11.
The working principle is as follows:
step 1, controlling the opening and closing actions of an electromagnetic valve group 20 and an electromagnetic valve 6 through a control unit 18, wherein the electromagnetic valve 6 is a straight-through electromagnetic valve which is in a normally closed state and serves for pulse delay measurement, one end of the electromagnetic valve is communicated with an opened zero-gas high-pressure gas tank 2 through an air outlet pipe 31, the air pressure of the zero-gas high-pressure gas tank 2 is 10MPa, the air pressure is adjusted to 0.05MPa through a high-pressure and low-pressure meter 4, the flow is adjusted to 3.5SLPM, the other end of the electromagnetic valve 6 is connected to a three-way valve 16, the distance from the electromagnetic valve 6 to the three-way valve 16 is equal to the distance from an air inlet 23 to the three-way valve 16, so that the time for the high-pressure zero gas to reach a gas concentration analyzer 13 is consistent with the time for the gas to be measured to enter the gas concentration analyzer 13 from the air inlet 23, the control unit 18 will continuously deliver 9 pulses of zero gas at 10s intervals in the morning of each day, on the ocean, background CO2The concentration is about 400ppm, when the zero gas pulse enters the gas concentration analyzer 13, the gas concentration analyzer 13 can observe to obtain obvious concentration fluctuation, the gas path delay can be calculated by analyzing the relation between the discharge time of the pulse and each detected pulse fluctuation, the control unit 18 supports manual control of the zero gas pulse through a manual gear,the delay time of the gas circuit is manually observed, so that the performance detection of the initial equipment is facilitated;
step 2, the second electromagnetic valve and the third electromagnetic valve are straight-through electromagnetic valves, the second electromagnetic valve is in a normally closed state, the third electromagnetic valve is in a normally open state, the fourth electromagnetic valve and the fifth electromagnetic valve are three-way electromagnetic valves and are in a straight-through normally open state, the electromagnetic valve group 20 consisting of the 4 electromagnetic valves is used for preventing water from entering a gas path, when the water detector 22 detects that water enters the gas path, the water is fed back to the control unit 18, the control unit 18 responds at the speed of 100ms, the working states of the 4 electromagnetic valves are switched simultaneously, the second electromagnetic valve is opened, the third electromagnetic valve is closed, the working gas path of the fourth electromagnetic valve and the fifth electromagnetic valve is switched from the gas inlet 23 to the gas inlet in the cabinet body 1 to prevent damage to the internal gas path equipment, the large-flow filter 21 at the front end of the third electromagnetic valve filters the entering gas and can prevent the water from entering the third electromagnetic valve, and after the second, meanwhile, in order to avoid that the high-frequency electromagnetic valve is repeatedly switched on and off to carry out water inlet and back flushing, the control unit 18 can enable each flushing process to last for 5 minutes, if no water exists in the subsequent detection gas circuit, the gas circuit can be automatically switched back to the initial state, and if water still exists in the gas circuit, the flushing is continued, so that the stability and the sustainability of the system are ensured;
step 4, before the air current enters the gas concentration analyzer 13, the air to be detected is dried through an air dryer, after the air current passes through the gas concentration analyzer 13, the air current is introduced into an outer tube of the air dryer by adopting a backflow method, the air current is discharged to the atmosphere through a high vacuum air pump, the air current is discharged to the atmosphere through the high vacuum air pump, and the air pressure ratio between the front of the gas inlet concentration analyzer and the back of the gas outlet concentration analyzer is about 5: 1, the water can be prevented from entering the measuring pipeline to damage equipment after the steps, and meanwhile, related data can be accurately measured.
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 (9)
1. A device for preventing water from entering an optical cavity ring-down closed-loop flux analyzer is characterized in that: including the cabinet body (1), zero gas high-pressure gas jar (2), air compressor machine (3) and support frame (5), first support (7) and second support (8) are installed respectively to one side of support frame (5), install solenoid valve (6) on second support (8), just solenoid valve (6) are connected with zero gas high-pressure gas jar (2) through outlet duct (31), install high-low pressure table (4) and flowmeter (15) respectively on outlet duct (31), install intake pipe (30) on first support (7), intake pipe (30) one end is passed through three-way valve (16) and is connected with nonrust steel pipe (26) one end, and the other end is connected to the three-way valve between solenoid valve two and the large flow filter, nonrust steel pipe (26) the other end is connected with air inlet (23), and the junction has cup jointed O type circle (25), air compressor machine (3) are installed through connecting pipe (9) to one side of the cabinet body (1), high vacuum air pump (11) and auxiliary pump (14) are installed respectively to the inside below of the cabinet body (1), the top of high vacuum air pump (11) and auxiliary pump (14) is provided with row and inserts (12), gas concentration analysis appearance (13) are installed at the top of row and insert (12), display (10), interchange straight charge controller (17), control unit (18), large-traffic filter (21) and water detector (22) are installed respectively to the inside of the cabinet body (1), air dryer (19) are installed to the bottom of display (10), electromagnetism valves (20) are installed to one side of display (10).
2. The apparatus of claim 1, wherein the means for preventing water ingress in the cavity ring-down closed-loop flux analyzer comprises: air inlet (23) contain 3D and print structure (29), filter screen (27), filter screen support (28), fastening screw (24) and O type circle (25), the inside of 3D printing structure (29) is provided with filter screen support (28), filter screen support (28) bottom is provided with filter screen (27), fastening screw (24) are passed through to the bottom of nonrust steel pipe (26) and 3D prints structure (29) and fixes.
3. The apparatus of claim 1, wherein the means for preventing water ingress in the cavity ring-down closed-loop flux analyzer comprises: the electromagnetic valve group (20) is composed of 4 electromagnetic valves, namely an electromagnetic valve II, an electromagnetic valve III, an electromagnetic valve IV and an electromagnetic valve V, and the electromagnetic valve II is connected with the air compressor (3).
4. The apparatus of claim 1, wherein the means for preventing water ingress in the cavity ring-down closed-loop flux analyzer comprises: the inner diameter of the stainless steel pipe (26) is 9 mm.
5. The apparatus of claim 1, wherein the means for preventing water ingress in the cavity ring-down closed-loop flux analyzer comprises: the inner diameters of the air inlet pipe (30) and the air outlet pipe (31) are 9 mm.
6. The apparatus of claim 1, wherein the means for preventing water ingress in the cavity ring-down closed-loop flux analyzer comprises: the control unit (18) is respectively electrically connected with the display (10), the alternating-current-to-direct-charging controller (17), the first electromagnetic valve (6), the electromagnetic valve group (20), the large-flow filter (21), the water detector (22), the high-vacuum air pump (11), the auxiliary pump (14) and the gas concentration analyzer (13).
7. The apparatus of claim 1, wherein the means for preventing water ingress in the cavity ring-down closed-loop flux analyzer comprises: the length of a pipeline between the first electromagnetic valve (6) and the three-way valve (16) is equal to the length of a pipeline from the air inlet (23) to the three-way valve (16).
8. The apparatus of claim 1, wherein the means for preventing water ingress in the cavity ring-down closed-loop flux analyzer comprises: and a manual valve is arranged between the gas concentration analyzer (13) and the high-vacuum air pump (11), is in a normally closed state and is used for balancing air pressure. When the system is powered off, the space between the gas concentration analyzer (13) and the high vacuum air pump (11) is in a vacuum state, and if air pressure balance is not performed, water vapor in the air dryer (19) can continuously permeate into a vacuum pipeline, so that water is accumulated in the high vacuum air pump (11).
9. A method for preventing water from entering an optical cavity ring-down closed-loop flux analyzer is characterized in that:
step 1, a control unit (18) is used for controlling opening and closing actions of an electromagnetic valve group (20) and an electromagnetic valve I (6), the electromagnetic valve I (6) is a straight-through electromagnetic valve and is in a normally closed state and serves for pulse delay measurement, one end of the electromagnetic valve I is communicated with an opened zero-gas high-pressure gas tank (2) through a gas outlet pipe (31), the gas pressure of the zero-gas high-pressure gas tank (2) is 10MPa, the gas pressure is adjusted to 0.05MPa through a high-low pressure meter (4), the flow rate is adjusted to 3.5SLPM, the other end of the electromagnetic valve I (6) is connected to a three-way valve (16), the distance from the electromagnetic valve I (6) to the three-way valve (16) is equal to the distance from a gas inlet (23) to the three-way valve (16), therefore, the time of the high-pressure zero gas reaching the gas concentration analyzer (13) is consistent with the time of the gas to be measured, The factors influencing the air path delay such as the blockage of a filter membrane and the like are necessary to measure the delay time at regular time, and the control unit (18) continuously releases 9 zero-air pulses at intervals of 10s in the morning every day and the background CO on the ocean2The concentration is about 400ppm, when zero gas pulse enters the gas concentration analyzer (13), the gas concentration analyzer (13) can observe obvious concentration fluctuation, and the discharge time of the pulse and each detected pulse are analyzedThe relationship between the pulse fluctuation can be calculated to obtain the gas path delay, the control unit (18) supports manual control of zero gas pulse through a manual gear, the gas path delay time is observed manually, and the performance detection of initial equipment is facilitated;
step 2, the second electromagnetic valve and the third electromagnetic valve are through electromagnetic valves, the second electromagnetic valve is in a normally closed state, the third electromagnetic valve is in a normally open state, the fourth electromagnetic valve and the fifth electromagnetic valve are three-way electromagnetic valves and are in a through normally open state, the electromagnetic valve group (20) formed by the 4 electromagnetic valves is used for preventing water from entering a gas path, when the water detector (22) detects that water enters the gas path, the water is fed back to the control unit (18), the control unit (18) responds at the speed of 100ms, the working states of the 4 electromagnetic valves are switched simultaneously, the second electromagnetic valve is opened, the third electromagnetic valve is closed, the working gas paths of the fourth electromagnetic valve and the fifth electromagnetic valve are switched from a gas inlet (23) to gas from the inside of the cabinet body (1) to prevent the internal gas path equipment from being damaged, the large-flow filter (21) at the front end of, after the second electromagnetic valve is opened, the 0.7MPa high-pressure airflow of the air compressor can instantly blow back water in the air path out of the air inlet (23), meanwhile, in order to avoid the situation that the high-frequency electromagnetic valve is repeatedly switched on and off for water inlet and back blowing, the control unit (18) can enable each blowing process to last for 5 minutes, if no water exists in the air path, the air path can be automatically switched back to the initial state, and if water still exists in the air path, blowing is continued, so that the stability and sustainability of the system are ensured;
step 3, when the air inlet pipeline of the closed-circuit flux is long and the pressure control technology of the gas concentration analyzer has great limitation on the air path speed of the high vacuum air pump, the physical structure which causes larger pipeline delay and possibly even changes turbulence, in order to ensure that the atmosphere enters the gas concentration analyzer (13) in a turbulent way, the Reynolds number of the gas flow in the pipeline is ensured to be more than 2000, therefore, an auxiliary pump (14) is required to be added, for rapidly pumping in the gas flow from the gas inlet, then pumping in the gas concentration analyzer (13), and the auxiliary pump (14) pumping speed is 20SLPM, the corresponding Reynolds number for a 9mm internal diameter pipeline is 2800 at an ambient temperature of 26 ℃, namely, the turbulence property of the atmosphere is reserved in the gas path, the gas concentration analyzer (13) only needs about 5SLPM gas flow, the redundant 15SLPM gas flow is discharged through a manual valve, and the discharged flow is controlled through a second flowmeter;
and 4, drying the gas to be detected through an air dryer (19) before the gas flow enters the gas concentration analyzer (13), introducing the gas flow into an outer tube of the air dryer (19) by adopting a backflow method after the gas flow passes through the gas concentration analyzer (13), wherein the gas pressure ratio between the gas flow before entering the gas concentration analyzer (13) and the gas flow after exiting the gas concentration analyzer (13) is about 5: 1, then the water is discharged to the atmosphere through a high vacuum air pump (11), and the water can be prevented from entering a measuring pipeline to damage equipment through the steps, and meanwhile, related data can be accurately measured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011005439.5A CN112051231A (en) | 2020-09-22 | 2020-09-22 | Method and device for preventing water from entering optical cavity ring-down closed-loop flux analyzer |
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| CN202011005439.5A CN112051231A (en) | 2020-09-22 | 2020-09-22 | Method and device for preventing water from entering optical cavity ring-down closed-loop flux analyzer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514615A (en) * | 2021-07-12 | 2021-10-19 | 临沂市安福电子有限公司 | System and method for gas path water inlet identification and water drainage of pump-suction type gas detector |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514615A (en) * | 2021-07-12 | 2021-10-19 | 临沂市安福电子有限公司 | System and method for gas path water inlet identification and water drainage of pump-suction type gas detector |
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