CN107703135B - On-site rapid detection device and detection method for content of dissolved acetylene gas in oil - Google Patents
On-site rapid detection device and detection method for content of dissolved acetylene gas in oil Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 139
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 title claims abstract description 42
- 239000000523 sample Substances 0.000 claims abstract description 74
- 238000012360 testing method Methods 0.000 claims abstract description 51
- 238000003756 stirring Methods 0.000 claims abstract description 38
- 238000007872 degassing Methods 0.000 claims abstract description 35
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 26
- 238000011010 flushing procedure Methods 0.000 claims description 18
- 239000011521 glass Substances 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000010926 purge Methods 0.000 claims description 4
- 239000003086 colorant Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 230000004927 fusion Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000000919 ceramic Substances 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 94
- 239000012159 carrier gas Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000004817 gas chromatography Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000012546 transfer 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
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
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Abstract
The invention relates to a field rapid detection device for the content of acetylene gas in oil and a detection method thereof, comprising a closed oil testing and degassing device, wherein an inner cavity of the oil testing and degassing device is sequentially communicated with an air chamber and an oil chamber from top to bottom, the top and the bottom of the oil testing and degassing device are respectively provided with an oil filling port and an oil draining port, the oil filling port penetrates through an oil-gas separation filter screen to extend inwards into the oil chamber, and an oil draining valve is arranged on the oil draining port; a stirring paddle is also arranged at the center of the bottom of the inner cavity of the oil testing and degassing device; the inner cavity of the oil testing degasser is provided with four ceramic heaters and temperature sensing probes; the air inlet pipe is communicated with the air chamber; the air chamber is also communicated with the detection tube through an air outlet tube; the pressurizing air pump, the oil discharge valve, the motor, the ceramic heater and the temperature sensing probe are electrically connected with the controller. The invention has the beneficial effects that: the method can rapidly detect the dissolved acetylene gas in the oil on site, rapidly judge the nature of the fault, automatically control the detection process and is simple to operate.
Description
Technical Field
The invention relates to a field rapid detection device and a detection method for the content of dissolved acetylene gas in oil, which are particularly suitable for a special rapid detection device for the field detection of the content of the dissolved acetylene gas in the oil of oil-filled electrical equipment of various voltage levels.
Background
In recent years, judging the internal fault property of oil-filled electrical equipment by detecting the content of dissolved gas in oil during operation has become an important means for ensuring the operation safety of the oil-filled electrical equipment, and detecting the content of dissolved acetylene gas in oil is an important technical index for judging whether the oil-filled electrical equipment has serious discharge faults or not.
The conventional method for detecting the content of the dissolved acetylene gas in the oil mainly comprises a laboratory gas chromatography detection method, namely, an operator collects an oil sample of the oil-filled electrical equipment to be detected on site, then sends the oil sample to an oil-gas laboratory, and finally obtains the content of the dissolved acetylene gas in the oil of the oil-filled electrical equipment after complex links such as sample treatment, oscillation degassing, balance gas transfer, gas sample injection chromatograph and the like, thereby judging the fault property of the oil-filled equipment. The data of the content of the dissolved acetylene gas in the oil obtained by the method is accurate and reliable, but each oil sample usually takes five to six hours to obtain the detection result from transportation to completion of the whole test operation flow. Once the oil-filled electrical equipment trips due to sudden faults, when the fault property is required to be rapidly analyzed and judged on site, the method is too long to meet the requirement of on-site instant judgment due to the fact that the method is too long in use.
Disclosure of Invention
The invention aims at overcoming the defects, and provides a field rapid detection device and a detection method for the content of dissolved acetylene gas in oil, so as to realize rapid judgment of faults of oil-filled electrical equipment.
The invention solves the technical problems by adopting the scheme that: the on-site rapid detection device for the content of the dissolved acetylene gas in the oil comprises a closed oil testing and degassing device, wherein an inner cavity of the oil testing and degassing device is sequentially communicated with an air chamber and an oil chamber from top to bottom, an oil-gas separation filter screen is further arranged between the air chamber and the oil chamber, an oil filling port and an oil draining port are further respectively arranged at the top and the bottom of the oil testing and degassing device, the oil filling port penetrates through the oil-gas separation filter screen and extends inwards into the oil chamber, and an oil draining valve is arranged on the oil draining port; the stirring paddle is driven by a motor and is arranged at the center of the bottom of the inner cavity of the oil testing and degassing device and below the oil-gas separation net; four heaters and a temperature sensing probe are symmetrically arranged at the bottom of the inner cavity of the oil degasser; the air inlet of the air pump is communicated with the air chamber through an air inlet pipe; the air chamber is also communicated with a transparent detection tube which contains chemical substances through an air outlet tube; the pressurizing air pump, the oil discharge valve, the motor, the heater and the temperature sensing probe are all electrically connected with a controller.
Further, the air outlet of the air inlet pipe is communicated with the air chamber through three branch pipes, the three branch pipes are arranged on the side wall of the cylinder at intervals from top to bottom, and the three branch pipes are also respectively provided with an air inlet valve; the air outlet pipe is arranged on the side wall of the cylinder relative to the branch pipe, and is also provided with an air outlet valve, a pressure stabilizing valve, a flow stabilizing valve and a flowmeter; the outlet of the air outlet pipe is also communicated with a first branch pipe and a second branch pipe, a flushing valve for controlling flushing is arranged on the first branch pipe, a detection valve for controlling detection is arranged on the second branch pipe, the air outlet pipe is communicated with the inlet of the detection pipe through the second branch pipe, the outlet of the detection pipe is also communicated with an air outlet pipe, and a one-way valve is arranged on the air outlet pipe; the air inlet pipe is also provided with a pressure gauge; the air inlet valve, the air outlet valve, the pressure stabilizing valve, the flow stabilizing valve, the flowmeter, the flushing valve and the detection valve are all electrically connected with the controller.
Further, the controller comprises an air switch B connected with an external alternating current power supply and an alternating current-direct current converter connected with the air switch; the positive output end of the AC-DC converter is connected with the negative output end of the AC-DC converter through a test key SQ1, a control relay 2J, a first timing relay 1SJ and an air path relay 1J; the positive output end of the AC-DC converter is connected with the negative output end of the AC-DC converter through a detection key SQ2, a temperature controller Q, a stirring relay 3J and a second timing relay 2 SJ; the controller also comprises a detection relay 4J, wherein one end of the detection relay 4J is connected with the positive output end of the AC-DC converter through a normally closed switch of the second timing relay 2SJ, and the other end of the detection relay is connected with the gas circuit relay 1J; the air inlet valve, the air outlet valve and the pressurized air pump are respectively and electrically connected with the first timing relay 1SJ through the air circuit relay 1J, the oil discharge valve and the flushing valve are electrically connected with the control relay 2J, and the detection valve is electrically connected with the detection relay 4J; the motor and the heater are electrically connected with the second timing relay 2SJ through the stirring relay 3J; the heater and the temperature sensing probe are also electrically connected with the temperature controller; the flowmeter is also connected with the positive output end and the negative output end of the alternating current-direct current converter through a power relay.
Further, the test key SQ1 and the detection key SQ2 are 24V self-locking power-off reset keys, and the first timing relay 1SJ and the second timing relay 2SJ are two-channel timing relays; the alternating current-direct current converter is a 220V alternating current-24V direct current converter.
Further, the oil testing and degassing device is a metal cylinder with the length of 80mm and the diameter of 65mm, the oil chamber capacity is 60ml, the interval between each branch pipe is 10mm, and the distance between the oil-gas separation filter screen and the top of the oil testing and degassing device is 35mm.
Further, the oil-gas separation filter screen is a fine glass fiber screen.
Further, the stirring paddle consists of a stirring rod and paddles obliquely arranged on two sides of the stirring rod; the paddles are triangular, and each paddle is provided with more than one through hole.
Further, the detecting tube is fixed on a supporting frame, a notch for fixing the detecting tube is formed in the upper surface of the supporting frame, and stainless steel frames for fixing the second branch tube and the third branch tube are respectively arranged at two ends of the supporting frame.
Further, the detection tube is a special glass tube for acetylene gas, the inner diameter of the detection tube is 3mm-4mm, the two ends of the glass tube are provided with fusion seals, and the surface of the glass tube is marked with gas concentration scales.
The invention also provides a detection method based on the on-site rapid detection device for the content of the dissolved acetylene gas in the oil, which comprises the following steps:
step S1, before detection and starting, extracting an oil sample from the inside of the oil-filled electrical equipment to be detected by using an oil sample taking needle cylinder;
s2, starting a pressurizing air pump, simultaneously starting an oil discharge valve, discharging accumulated oil in an oil chamber of the oil testing and degassing device, and purging by utilizing high-pressure air flow in the air pump through an air inlet pipe, an inner cavity of the oil testing and degassing device and an air outlet pipe in sequence;
s3, after flushing, closing an oil discharge valve and a pressurizing air pump, and injecting the oil sample extracted in the step S1 into an oil chamber through an oil injection port;
step S4: detecting an oil sample, heating the injected oil sample to 50 ℃ in a sealed oil chamber by a heater, and continuously stirring by a stirring paddle while heating to ensure that the injected oil sample is fully mixed with pure air in the oil chamber;
step S5: after 5 minutes, stopping stirring and standing for 5 minutes, wherein the gas accumulated in the gas chamber is an equilibrium gas sample containing acetylene gas dissolved in oil;
step S6: after the rest time is reached, starting a pressurizing air pump, stabilizing and stabilizing the balance air sample through an air outlet pipe by high-pressure air flow in the pressurizing air pump, and inputting the balance air sample under constant pressure and flow rate into a detection pipe;
step S7: the balance gas sample and the chemical substances in the detection tube are subjected to chemical reaction, and the balance gas sample and the chemical substances in the detection tube are displayed on the outer surface of the detection tube through colors; when the gas flow continuously passing through the detection pipe reaches a set value, the pressurizing air pump is closed, and the detection is finished;
step S8: after the detection is completed, the gas in the detection tube is discharged.
Compared with the prior art, the invention has the following beneficial effects: the on-site rapid detection device for the dissolved acetylene gas in the oil can realize rapid detection of the dissolved acetylene gas in the oil on site when the oil-filled electrical equipment suddenly fails, thereby rapidly judging the nature of the failure. The whole detection process is automatically controlled, and the operation is simple and convenient. Because the automatic integrated flow of oil testing and degassing, gas taking and detection is realized, the detection time is only about 15 minutes, which is one twentieth of the time consumption of the laboratory gas chromatography; the device is characterized in that the detection tube is a high-precision gas detection tube, the testing speed is high, the display mode is visual and clear, the analysis and judgment speed of whether the on-site oil-filled electrical equipment has serious discharge faults is greatly improved, the whole device is small in structure and convenient to carry, a special carrier gas source is not required to be configured, and the device is very suitable for on-site rapid detection of the content of acetylene gas in oil of the oil-filled electrical equipment with various voltage levels.
Drawings
The patent of the invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the operation of a device for on-site rapid detection of dissolved acetylene gas in oil according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a test oil degasser according to an embodiment of the invention.
FIG. 3 is a control loop diagram of a device for on-site rapid detection of dissolved acetylene gas in oil according to an embodiment of the present invention.
In the figure: 1-a pressurized air pump; 2-a pressure gauge; 3-an air inlet pipe; 30-a branch pipe; 4-an oil sample taking needle cylinder; 5-an oil testing and degassing device; 500-intake valve; 501-an oil filling port; 502-an air outlet valve; 503-an oil-gas separation filter screen; 504-a heater; 505-stirring paddles; 506-temperature sensing probe; 507-an oil drain valve; 508-an electric motor; 6-a pressure stabilizing valve; 7-a steady flow valve; 8-a flow meter; 9-flushing valve; 10-detecting a valve; 11-a detection tube; 12-fixing frame; 13-a one-way valve; 14-an air outlet pipe; 140-a first branch; 141-second branch pipe.
Description of the embodiments
The invention is further described below with reference to the drawings and the detailed description.
As shown in fig. 1 to 3, the on-site rapid detection device for the content of dissolved acetylene gas in oil provided by the embodiment of the invention comprises a closed oil testing and degassing device 5, wherein an inner cavity of the oil testing and degassing device 5 is sequentially communicated with an air chamber and an oil chamber from top to bottom, an oil-gas separation filter screen 503 is further arranged between the air chamber and the oil chamber, the top and the bottom of the oil testing and degassing device 5 are respectively provided with an oil filling port 501 and an oil draining port, the oil filling port 501 penetrates through the oil-gas separation filter screen 503 and extends inwards into the oil chamber, and an oil draining valve 507 is arranged on the oil draining port; a stirring paddle 505 is further arranged at the center of the bottom of the inner cavity of the oil testing and degassing device 5 and below the oil-gas separation net, and the stirring paddle 505 is driven by a motor 508; four heaters 504 and a temperature sensing probe 506 are symmetrically arranged at the bottom of the inner cavity of the oil degasser; the air inlet pipe 3 is communicated with the air chamber, and the air inlet of the air pump 1 is communicated with the air chamber through the air inlet pipe 1; the air chamber is also communicated with a transparent detection tube 11 which contains chemical substances through an air outlet tube 14; the pressurizing air pump 1, the oil discharge valve 507, the motor 508, the heater 504 and the temperature sensing probe 506 are all electrically connected with a controller.
From the above, the beneficial effects of the invention are as follows: the device adopts the principle of headspace degassing to fully mix the oil sample to be tested with air, so that an equilibrium gas sample with acetylene gas components dissolved in the oil is formed. And then the gas sample to be detected is sent into a specific gas detection tube 11 by utilizing the principle of a pneumatic piston, and the gas sample and chemical substances in the detection tube 11 are subjected to chemical reaction and corresponding color change, so that the working principle of judging whether the gas to be detected contains acetylene gas components and the content of the acetylene gas components is developed. The device has the advantages of high testing speed, visual and clear display mode, small and exquisite structure, convenient carrying and no need of configuring a special carrier gas source, and is very suitable for rapidly detecting the content of the dissolved acetylene gas in the oil on site by the oil-filled electrical equipment of each voltage level. The oil filling port 501 is a cock type oil filling port 501, and a section of metal pipe extends below the oil filling port 501 for injecting the oil sample to be measured below the oil-gas separation filter screen 503. The heater 504 is a DC24V ceramic electric heating rod with the length of 16mm and the diameter of 3mm, and the heating power is less than or equal to 50W and is mainly used for rapidly and uniformly heating an oil sample.
In this embodiment, the air outlet of the air inlet pipe 3 is communicated with the air chamber through three branch pipes 30, the three branch pipes 30 are arranged on the side wall of the cylinder from top to bottom at intervals, and the three branch pipes 30 are respectively provided with an air inlet valve 500; the air outlet pipe 14 is arranged on the side wall of the cylinder relative to the branch pipe 30, and the air outlet pipe 14 is also provided with an air outlet valve 502, a pressure stabilizing valve 6, a pressure stabilizing valve 7 and a flowmeter 8; the outlet of the air outlet pipe 14 is also communicated with a first branch pipe 140 and a second branch pipe 141, the first branch pipe 140 is provided with a flushing valve 9 for controlling flushing, the second branch pipe 141 is provided with a detection valve 10 for controlling detection, the air outlet pipe 14 is communicated with the inlet of the detection pipe 11 through the second branch pipe 141, the outlet of the detection pipe 11 is also communicated with an air outlet pipe 14, and the air outlet pipe 14 is provided with a one-way valve 1313; the air inlet pipe 3 is also provided with a pressure gauge 2; the air inlet valve 500, the air outlet valve 502, the pressure stabilizing valve 6, the flow stabilizing valve 7, the flowmeter 8, the flushing valve 9 and the detection valve 10 are all electrically connected with the controller. The pressure stabilizing valve 6 and the flow stabilizing valve 7 are divided into an airflow pressure stabilizer and an airflow flow stabilizer and are used for stabilizing the mixed airflow with the balanced air sample output from the air outlet of the oil testing degasser 5 to 30kpa and stabilizing the flow to 100mL/min so as to meet the test requirement of the detection tube 11. The flow meter 8 is an electronic gas mass flow meter 8, the flow measurement range is 5-35000 mL/min, the response time is less than or equal to 3 seconds, and the flow meter 8 is mainly used for controlling the flow of the mixed gas flow with the balance gas sample flowing into the detection tube 11, so that the accuracy of the test is ensured. The check valve 13 is a special check valve 13 for the gas chromatograph, and is mainly used for one-way sealing of the air outlet after the detection tube 11 is arranged in the detection tube 11 fixing frame 12, so that the reagent in the detection tube 11 is prevented from being polluted by external impurities when the detection is not performed, and the detection accuracy is prevented from being influenced.
In this embodiment, the controller includes an air switch B connected to an external ac power source, and an ac-dc converter connected to the air switch; the positive output end of the AC-DC converter is connected with the negative output end of the AC-DC converter through a test key SQ1, a control relay 2J, a first timing relay 1SJ and an air path relay 1J; the positive output end of the AC-DC converter is connected with the negative output end of the AC-DC converter through a detection key SQ2, a temperature controller Q, a stirring relay 3J and a second timing relay 2 SJ; the controller also comprises a detection relay 4J, wherein one end of the detection relay 4J is connected with the positive output end of the AC-DC converter through a normally closed switch of the second timing relay 2SJ, and the other end of the detection relay is connected with the gas circuit relay 1J; the air inlet valve 500, the air outlet valve 502 and the pressurized air pump 1 are respectively and electrically connected with the first timing relay 1SJ through the air path relay 1J, the oil discharge valve 507 and the flushing valve 9 are electrically connected with the control relay 2J, and the detection valve 10 is electrically connected with the detection relay 4J; the motor 508 and the heater 504 are electrically connected with the second timing relay 2SJ through the stirring relay 3J; the heater 504 and the temperature sensing probe 506 are also electrically connected with the temperature controller; the flowmeter 8 is also connected with the positive output end and the negative output end of the alternating current-direct current converter through a power relay LJ.
In this embodiment, the test key SQ1 and the detection key SQ2 are both 24V self-locking power-off reset keys, and the first timing relay 1SJ and the second timing relay 2SJ are both dual-channel timing relays; the alternating current-direct current converter is a 220V alternating current-24V direct current converter.
In this embodiment, the oil test degasser 5 is a metal cylinder with a length of 80mm and a diameter of 65mm, the oil chamber capacity is 60ml, the interval between each branch pipe 30 is 10mm, and the distance between the oil-gas separation filter 503 and the top of the oil test degasser 5 is 35mm.
In this embodiment, the oil-gas separation screen 503 is a fine glass fiber mesh. The oil-gas separator is mainly used for separating oil-gas interfaces, preventing oil from splashing upwards and quickly stabilizing oil foam when stirring an oil sample in an oil chamber, and shortening the formation time of a measured balance gas sample.
In this embodiment, the stirring paddle 505 is composed of a stirring rod and blades obliquely arranged at two sides of the stirring rod; the paddles are triangular, and each paddle is provided with more than one through hole. The stirring paddle 505 is driven by a micro decelerating direct current motor 508 with the rotating speed of 300 revolutions per minute, the rotating diameter is 45mm, and each blade is provided with three through holes with the diameter of 2mm, so that the oil is rapidly foamed during stirring, the oil and the air are fully dissolved, and the rapid distribution balance of dissolved acetylene gas in the oil in gas-liquid two phases is promoted.
In this embodiment, the detecting tube 11 is fixed on a supporting frame, the upper surface of the supporting frame is provided with a notch for fixing the detecting tube 11, and two ends of the supporting frame are respectively provided with a stainless steel frame for fixing the second branch tube 141 and the third branch tube.
In this embodiment, the detection tube 11 is a glass tube dedicated for acetylene gas, the inner diameter of the glass tube is 3mm-4mm, two ends of the glass tube are provided with a seal, and the surface of the glass tube is marked with a concentration scale of the gas. The glass tube with the two ends sealed tightly fills with special reagent for acetylene gas capable of reacting with the gas to be detected and developing color, the surface of the glass tube is marked with the concentration scale and the detection range of the gas, and the detection rated gas pressure is 30kpa, the flow rate is 100mL/min, and the detection gas volume is 500mL. When in use, the glass seals at the two ends of the detection tube 11 are cut off, and the detection tube 11 is inserted into the fixing frame 12 according to the air flow detection direction for use.
The invention also provides a detection method based on the on-site rapid detection device for the content of the dissolved acetylene gas in the oil, which comprises the following steps:
step S1, before detection and starting, extracting an oil sample from the inside of the oil-filled electrical equipment to be detected by using an oil sample taking needle cylinder 4;
step S2, starting a pressurizing air pump 1, simultaneously starting an oil discharge valve 507, discharging accumulated oil in an oil chamber of the oil testing and degassing device 5, and purging by utilizing high-pressure air flow in the air pump through an air inlet pipe 3, an inner cavity of the oil testing and degassing device 5 and an air outlet pipe 14 in sequence;
step S3, after flushing, closing the oil discharge valve 507 and the pressurizing air pump 1, and injecting the oil sample extracted in the step S1 into an oil chamber through the oil injection port 501;
step S4: detecting the oil sample, heating the injected oil sample to 50 ℃ in a sealed oil chamber through a heater 504, and continuously stirring by a stirring paddle 505 while heating to ensure that the injected oil sample is fully mixed with pure air in the oil chamber;
step S5: after 5 minutes, stopping stirring and standing for 5 minutes, wherein the gas accumulated in the gas chamber is an equilibrium gas sample containing acetylene gas dissolved in oil;
step S6: after the rest time is reached, starting the pressurizing air pump 1, stabilizing and stabilizing the balance air sample through the air outlet pipe 14 by high-pressure air flow in the pressurizing air pump 1, and inputting the balance air sample under constant pressure and flow rate into the detection pipe 11;
step S7: the balance gas sample and the chemical substances in the detection tube 11 are subjected to chemical reaction, and the balance gas sample and the chemical substances in the detection tube 11 are displayed on the outer surface of the detection tube through colors; when the gas flow continuously passing through the detection pipe 11 reaches a set value, the pressurizing air pump 1 is turned off, and the detection is finished;
step S8: after the detection is completed, the gas in the detection tube 11 is discharged.
The present invention will be further explained by the following specific implementation procedure of this embodiment.
When the oil sample taking needle cylinder 4 is used, after an oil sample is taken out from the inside of the oil-filled electrical equipment to be tested, a test key on the controller is pressed, the control relay 2J, the gas circuit relay 1J and the first timing relay 1SJ are turned on, the normally open switches 1J1, 1J2, 1J3, 1J4 and 1J5 of the gas circuit relay 1J are turned on, and the normally open switches 2J1 and 2J2 of the control relay 2J are turned on. The pressurized air pump 1 is started, the oil discharge valve 507, the air inlet valve 500, the air outlet valve 502 and the flushing valve 9 at the bottom of the oil chamber of the oil testing and degassing device 5 are opened, the accumulated oil in the oil chamber of the oil testing and degassing device 5 is discharged completely, the high-pressure air flow is utilized to purge the air passage formed by the inner part of the oil chamber, the air outlet pipe 14 and the air inlet pipe 3, the first timing relay 1SJ normally open switch 1SJ1 breaks a loop after about 5 minutes, the oil discharge valve 507, the air inlet valve 500, the air outlet valve 502, the flushing valve 9 and the pressurized air pump 1 are also powered off and reset, and the preparation is carried out before the inlet and the outlet of the oil chamber are automatically closed to finish the test.
After preparation, 40mL of oil sample is injected into the oil chamber of the oil testing and degassing device 5 from the oil filling port 501, a detection key on the controller is pressed, the detection key is sprung up for resetting, the first timing relay 1SJ is powered off, and at the moment, the oil testing and degassing detection flow is started: the temperature controller Q, the stirring relay 3J, and the second timing relay 2SJ are turned on, so that the normally open switches 2SJ1 and 2SJ2 of the second timing relay 2SJ are closed, the signal contacts of the normally open switches 3J1 and 3J2 of the stirring relay 3J and the temperature controller Q are closed, and the built-in heater 504 and the stirring paddle 505 are started. The injected oil sample to be measured is heated to 50 ℃ in the sealed oil chamber by a heater 504, and the stirring paddle 505 is continuously stirred while heating, so that the injected oil sample is fully mixed with pure air in the oil chamber. After 5 minutes, the second timing relay 2SJ2 normally open switch 2SJ2 turns off the loop, stops heating and stirring and starts to stand still, and the gas accumulated above the oil-gas separation screen 503 in the oil chamber is the balance gas sample containing acetylene gas dissolved in the oil.
After the oil tank arrives for 5 minutes, the second timing relay 2SJ normally open switch 2SJ2 is closed, the gas circuit relay 1J and the detection relay 4J are connected, the normally open switches 1J1, 1J2, 1J3, 1J4, 1J5 and 4J1 are closed, the pressurizing air pump 1 is started, the oil chamber air inlet valve 500, the air outlet valve 502 and the detection valve 10 are simultaneously opened, the high-pressure air flow generated by the pressurizing air pump 1 accelerates the balance air sample accumulated above the oil-gas separation filter 503 in the oil chamber, and the balance air sample flows out of the air outlet valve 502, is stabilized and stabilized by the air flow stabilizing control device, namely the pressure stabilizing valve 6 and the steady flow valve 7 and then is fed into the acetylene detection pipe 11 of the gas detection part at constant pressure and flow rate. The balance gas sample in the tube is subjected to chemical reaction with the detection substance, and the outer surface of the acetylene detection tube 11 is indicated by color, and the detected gas is discharged into the atmosphere after passing through the one-way valve 13. When the gas flow continuously passing through the detection tube 11 reaches the set value (about 500 mL) of the electronic flowmeter 8, the power relay LJ is powered off, the normally open switch LJ1 of the power relay is disconnected, the power supply of the whole loop is cut off, all parts of the system are powered off and reset, and the detection is finished. Through the above process, the purpose of dissolving acetylene gas in the oil which is rapidly detected and judged on site is realized.
In summary, the on-site rapid detection device and the detection method for the content of the dissolved acetylene gas in the oil provided by the invention have the advantages of high test speed, small structure, convenience in carrying, no need of a special carrier gas source, and suitability for on-site rapid detection of the content of the dissolved acetylene gas in the oil by the on-site oil-filled electrical equipment with various voltage levels, and greatly improved analysis and judgment speed of whether the on-site oil-filled electrical equipment has serious discharge faults.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention will be apparent from the following detailed description, wherein the invention is described, by way of illustration and example only, of the preferred embodiment of the invention, and it is intended that the invention not be limited to the specific embodiments of the invention, but that the invention is to be interpreted as including all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (1)
1. An on-site rapid detection device for the content of dissolved acetylene gas in oil is characterized in that: the device comprises a closed oil testing and degassing device, wherein an inner cavity of the oil testing and degassing device is sequentially communicated with an air chamber and an oil chamber from top to bottom, an oil-gas separation filter screen is arranged between the air chamber and the oil chamber, an oil filling port and an oil draining port are respectively arranged at the top and the bottom of the oil testing and degassing device, the oil filling port penetrates through the oil-gas separation filter screen and extends inwards into the oil chamber, and an oil draining valve is arranged on the oil draining port; the stirring paddle is driven by a motor and is arranged at the center of the bottom of the inner cavity of the oil testing and degassing device and below the oil-gas separation net; four heaters and a temperature sensing probe are symmetrically arranged at the bottom of the inner cavity of the oil degasser; the air inlet of the air pump is communicated with the air chamber through an air inlet pipe; the air chamber is also communicated with a transparent detection tube which contains chemical substances through an air outlet tube; the pressurizing air pump, the oil discharge valve, the motor, the heater and the temperature sensing probe are all electrically connected with a controller;
the method adopts a headspace degassing method principle to fully mix a tested oil sample with air to form a balance gas sample with acetylene gas components dissolved in oil; then the gas sample to be detected is sent into the gas detection tube by utilizing the principle of the pneumatic piston, and as the gas sample and chemical substances in the detection tube are subjected to chemical reaction and corresponding color change, whether the gas to be detected contains acetylene gas components and the content of the acetylene gas components is judged;
the detection method comprises the following steps:
step S1: before detection is started, an oil sample is extracted from the inside of the oil-filled electrical equipment to be detected by using an oil sample extraction needle cylinder;
step S2: starting a pressurizing air pump, simultaneously starting an oil discharge valve, discharging accumulated oil in an oil chamber of the oil testing and degassing device, and purging by utilizing high-pressure air flow in the air pump through an air inlet pipe, an inner cavity of the oil testing and degassing device and an air outlet pipe in sequence;
step S3: after flushing, closing an oil discharge valve and a pressurizing air pump, and injecting the oil sample extracted in the step S1 into an oil chamber through an oil injection port;
step S4: detecting an oil sample, heating the injected oil sample to 50 ℃ in a sealed oil chamber by a heater, and continuously stirring by a stirring paddle while heating to ensure that the injected oil sample is fully mixed with pure air in the oil chamber;
step S5: after 5 minutes, stopping stirring and standing for 5 minutes, wherein the gas accumulated in the gas chamber is an equilibrium gas sample containing acetylene gas dissolved in oil;
step S6: after the rest time is reached, starting a pressurizing air pump, stabilizing and stabilizing the balance air sample through an air outlet pipe by high-pressure air flow in the pressurizing air pump, and inputting the balance air sample under constant pressure and flow rate into a detection pipe;
step S7: the balance gas sample and the chemical substances in the detection tube are subjected to chemical reaction, and the balance gas sample and the chemical substances in the detection tube are displayed on the outer surface of the detection tube through colors; when the gas flow continuously passing through the detection pipe reaches a set value, the pressurizing air pump is closed, and the detection is finished;
step S8: after the detection is completed, discharging the gas in the detection tube;
the air outlet of the air inlet pipe is communicated with the air chamber through three branch pipes, the three branch pipes are arranged on the side wall of the cylinder at intervals from top to bottom, and the three branch pipes are also respectively provided with an air inlet valve; the air outlet pipe is arranged on the side wall of the cylinder relative to the branch pipe, and is also provided with an air outlet valve, a pressure stabilizing valve, a flow stabilizing valve and a flowmeter; the outlet of the air outlet pipe is also communicated with a first branch pipe and a second branch pipe, a flushing valve for controlling flushing is arranged on the first branch pipe, a detection valve for controlling detection is arranged on the second branch pipe, the air outlet pipe is communicated with the inlet of the detection pipe through the second branch pipe, the outlet of the detection pipe is also communicated with an air outlet pipe, and a one-way valve is arranged on the air outlet pipe; the air inlet pipe is also provided with a pressure gauge; the air inlet valve, the air outlet valve, the pressure stabilizing valve, the flow stabilizing valve, the flowmeter, the flushing valve and the detection valve are all electrically connected with the controller;
the controller comprises an air switch B connected with an external alternating current power supply and an alternating current-direct current converter connected with the air switch; the positive output end of the AC-DC converter is connected with the negative output end of the AC-DC converter through a test key SQ1, a control relay 2J, a first timing relay 1SJ and an air path relay 1J; the positive output end of the AC-DC converter is connected with the negative output end of the AC-DC converter through a detection key SQ2, a temperature controller Q, a stirring relay 3J and a second timing relay 2 SJ; the controller also comprises a detection relay 4J, wherein one end of the detection relay 4J is connected with the positive output end of the AC-DC converter through a normally closed switch of the second timing relay 2SJ, and the other end of the detection relay is connected with the gas circuit relay 1J; the air inlet valve, the air outlet valve and the pressurized air pump are respectively and electrically connected with the first timing relay 1SJ through the air circuit relay 1J, the oil discharge valve and the flushing valve are electrically connected with the control relay 2J, and the detection valve is electrically connected with the detection relay 4J; the motor and the heater are electrically connected with the second timing relay 2SJ through the stirring relay 3J; the heater and the temperature sensing probe are also electrically connected with the temperature controller; the flowmeter is also connected with the positive output end and the negative output end of the alternating current-direct current converter through a power relay LJ;
the test key SQ1 and the detection key SQ2 are 24V self-locking power-off reset keys, and the first timing relay 1SJ and the second timing relay 2SJ are two-channel timing relays; the alternating current-direct current converter is a 220V alternating current-24V direct current converter;
the oil testing and degassing device is a metal cylinder with the length of 80mm and the diameter of 65mm, the oil chamber capacity is 60ml, the interval between each branch pipe is 10mm, and the distance between the oil-gas separation filter screen and the top of the oil testing and degassing device is 35mm;
the oil-gas separation filter screen is a fine glass fiber screen;
the stirring paddle consists of a stirring rod and paddles obliquely arranged on two sides of the stirring rod; the blades are triangular, and each blade is provided with more than one through hole;
the detection tube is fixed on a support frame, a notch for fixing the detection tube is formed in the upper surface of the support frame, and stainless steel frames for fixing the second branch tube and the third branch tube are respectively arranged at two ends of the support frame;
the detection tube is a special glass tube for acetylene gas, the inner diameter of the detection tube is 3mm-4mm, the two ends of the glass tube are provided with fusion seals, and the surface of the glass tube is marked with gas concentration scales.
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