CN108534912B - Visual detection system and method for liquefaction temperature of mixed insulating gas - Google Patents
Visual detection system and method for liquefaction temperature of mixed insulating gas Download PDFInfo
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- CN108534912B CN108534912B CN201810108260.9A CN201810108260A CN108534912B CN 108534912 B CN108534912 B CN 108534912B CN 201810108260 A CN201810108260 A CN 201810108260A CN 108534912 B CN108534912 B CN 108534912B
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Abstract
The invention provides a visual detection system and a visual detection method for liquefaction temperature of mixed insulating gas, which comprises a gas supply unit, a mixing unit, a phase inversion unit, a refrigeration unit and a control unit which are sequentially connected; the air supply unit comprises at least two air supply branches; the mixing unit comprises a mixing tank and a pressure regulating assembly; the phase conversion unit comprises a temperature regulation box, a gas phase converter arranged in the temperature regulation box and a heat exchanger connected with the refrigeration unit; the control unit is connected with the temperature sensor arranged in the temperature adjusting box, the pressure sensor and the temperature sensor in the gas phase converter and the refrigerating unit.
Description
Technical Field
The invention relates to a liquefaction temperature detection technology, in particular to a visual detection system and a visual detection method for liquefaction temperature of mixed insulating gas.
Background
Liquefaction refers to the process by which a substance changes from a gaseous state to a liquid state. Typically, the gas liquefies in two situations, one to reduce the temperature and one to compress the volume. The gas-insulated metal-enclosed switchgear is a metal-enclosed switchgear and a control device which adopt gas with certain pressure (higher than atmospheric pressure) as an insulating medium, and is widely applied to the power industry due to the advantages of compact structure, small occupied area, high reliability, strong safety, small maintenance workload and the like. In which the gas and liquefied state of the insulating gas are closely related to the insulating properties thereof. If the insulating gas in the gas insulated metal-enclosed switchgear is liquefied, the gas insulated metal-enclosed switchgear may have electric power accidents such as insulation breakdown or failure, which may cause immeasurable loss.
In different engineering application scenes, the mixed insulating gas with different mixing proportions and different working pressures is adopted, different insulating properties and liquefaction temperatures are achieved, the liquefaction temperature of the mixed insulating gas with different mixing proportions and different working pressures is detected, the physical and chemical states of the mixed insulating gas in the electrical equipment can be evaluated, and the insulating properties, the purification treatment technology and the like of the gas can be further researched based on the liquefaction temperature. At present, a phase balance experiment system adopted in the market detects the temperature in a gas-liquid phase balance state, is not suitable for detecting the liquefaction temperature of the mixed insulating gas, and has larger deviation between the measured liquefaction temperature of the mixed insulating gas and the liquefaction temperature in engineering application.
Disclosure of Invention
In order to overcome the defect that the liquefaction temperature of the mixed insulating gas detected by a phase balance experiment system in the prior art has larger deviation with the liquefaction temperature in engineering application, the invention provides a visual detection system and a visual detection method for the liquefaction temperature of the mixed insulating gas, which comprise a gas supply unit, a mixing unit, a phase conversion unit, a refrigeration unit and a control unit which are sequentially connected; the air supply unit comprises at least two air supply branches; the mixing unit comprises a mixing tank and a pressure regulating assembly; the phase conversion unit comprises a temperature regulation box, a gas phase converter arranged in the temperature regulation box and a heat exchanger connected with the refrigeration unit; the control unit is connected with the temperature sensor arranged in the temperature adjusting box, the pressure sensor and the temperature sensor in the gas phase converter and the refrigerating unit.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
on one hand, the invention provides a visual detection system for the liquefaction temperature of mixed insulating gas, which comprises a gas supply unit, a mixing unit, a phase inversion unit, a refrigeration unit and a control unit which are connected in sequence;
the air supply unit comprises at least two air supply branches;
the mixing unit comprises a mixing tank and a pressure regulating assembly;
the phase conversion unit comprises a temperature regulation box, a gas phase converter arranged in the temperature regulation box and a heat exchanger connected with the refrigeration unit;
the control unit is connected with a temperature sensor arranged in the temperature adjusting box, a pressure sensor and a temperature sensor in the gas phase converter and a refrigerating unit.
The gas supply branch comprises a gas inlet, a pressure reducing valve and a mass flowmeter which are connected in sequence;
the pressure regulating assembly comprises a booster pump, a pressure gauge, a vacuum pump and a regulating valve;
the output end of the mass flow meter is connected with the input end of the mixing tank, the output end of the mixing tank is connected with the regulating valve through the booster pump, and the regulating valve is connected with the gas phase converter through the gas supply pipeline; the pressure gauge and the vacuum pump are arranged on a pipeline between the booster pump and the regulating valve;
the regulating valve is a needle type regulating valve.
The system further comprises a motor and an impeller, wherein the motor is arranged at the top of the temperature adjusting box and is connected with the impeller arranged in the temperature adjusting box through a stirring shaft, the stirring shaft penetrates through the heat exchanger, the heat exchanger is a coil pipe, and the coil pipe is made of stainless steel.
The temperature regulation box is filled with a refrigerating medium, the gas phase converter and the heat exchanger are respectively arranged at the middle position of the left half part and the middle position of the right half part of the temperature regulation box, the temperature sensor arranged in the temperature regulation box is positioned between the gas phase converter and the heat exchanger, and the pressure sensor and the temperature sensor in the gas phase converter are positioned at the middle position of the gas phase converter.
The gas phase converter is cylindrical and comprises a converter body and a converter cover, wherein the height of the converter body is 3-4 times of the inner diameter;
the converter body is made of organic glass, and the converter cover is made of stainless steel.
The temperature adjusting box is cylindrical and comprises a stainless steel box body and a box cover;
and an observation window is arranged on one side of the stainless steel box body close to the gas phase converter, and the observation window is made of optical glass.
The gas supply pipeline, the capillary pipeline between the pressure sensor and the control module, and the capillary pipeline between the temperature sensor and the control module in the gas phase converter respectively penetrate through the box cover and the converter cover in sequence, and are sealed with the cavity cover by polytetrafluoroethylene and a rubber ring.
The control unit comprises a display screen for displaying the internal pressure and temperature of the gas phase converter respectively detected by a pressure sensor and a temperature sensor in the gas phase converter and the internal temperature of the temperature regulating box detected by the temperature sensor in the temperature regulating box.
The control unit comprises a controller, and the refrigeration unit comprises a refrigerator;
the controller compares the internal temperature of the gas phase converter displayed by the display screen with a first set temperature, and records the temperature and the pressure at the moment if the internal temperature of the gas phase converter displayed by the display screen is equal to the first set temperature; if the internal temperature of the gas phase converter displayed by the display screen is higher than the first set temperature, the controller issues a starting command to the refrigerator, the refrigerator continues to work until the internal temperature of the gas phase converter displayed by the display screen reaches the first set temperature, and the temperature and the pressure at the moment are recorded; if the internal temperature of the gas phase converter displayed by the display screen is lower than the first set temperature, the controller gives a stop command to the refrigerator, the refrigerator stops working until the internal temperature of the gas phase converter displayed by the display screen reaches the first set temperature, records the temperature and the pressure at the moment, compares the internal temperature of the gas phase converter displayed by the display screen with different set temperatures in sequence, executes the same operation until the internal temperature of the gas phase converter displayed by the display screen reaches the lowest set temperature, and records the temperature and the pressure at the moment.
In another aspect, the present invention provides a method for detecting a liquefaction temperature of a mixed insulating gas by using a system for visually detecting a liquefaction temperature of a mixed insulating gas, including:
respectively vacuumizing an internal pipeline of the gas supply unit, an internal pipeline of the mixing unit and the gas phase converter by a vacuum pump in the pressure regulating assembly, preparing mixed insulating gas by the gas supply unit and the mixing tank, and filling the mixed insulating gas into the gas phase converter by the pressure regulating assembly;
starting a refrigerating machine in the refrigerating unit to cool the refrigerating medium in the temperature adjusting box, and simultaneously driving the impeller to rotate at a set speed by the motor to ensure that the refrigerating medium exchanges heat quickly and uniformly;
the pressure and the temperature in the gas phase converter are collected in real time through a pressure sensor and a first temperature sensor, and the temperature in the temperature adjusting box is collected in real time through a second temperature sensor;
comparing the internal temperature of the gas phase converter displayed by the display screen with a first set temperature, and recording the temperature and the pressure at the moment if the internal temperature of the gas phase converter displayed by the display screen is equal to the first set temperature; if the internal temperature of the gas phase converter displayed by the display screen is higher than the first set temperature, the controller issues a starting command to the refrigerator, the refrigerator continues to work until the internal temperature of the gas phase converter displayed by the display screen reaches the first set temperature, and the temperature and the pressure at the moment are recorded; if the internal temperature of the gas phase converter displayed by the display screen is lower than the first set temperature, the controller gives a stop command to the refrigerator, the refrigerator stops working until the internal temperature of the gas phase converter displayed by the display screen reaches the first set temperature, records the temperature and the pressure at the moment, compares the internal temperature of the gas phase converter displayed by the display screen with different set temperatures in sequence, executes the same operation until the internal temperature of the gas phase converter displayed by the display screen reaches the lowest set temperature, and records the temperature and the pressure at the moment;
and drawing a temperature-pressure curve according to the recorded temperature and pressure, and obtaining the liquefaction temperature of the mixed insulating gas according to the temperature-pressure curve.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
the visual detection system for the liquefaction temperature of the mixed insulating gas comprises a gas supply unit, a mixing unit, a phase inversion unit, a refrigeration unit and a control unit which are sequentially connected; the air supply unit comprises at least two air supply branches; the mixing unit comprises a mixing tank and a pressure regulating assembly; the phase conversion unit comprises a temperature regulation box, a gas phase converter arranged in the temperature regulation box and a heat exchanger connected with the refrigeration unit; the control unit is connected with the temperature sensor arranged in the temperature adjusting box, the pressure sensor and the temperature sensor in the gas phase converter and the refrigerating unit, and the device can conveniently, visually and reliably detect the liquefaction temperature of the mixed insulating gas, has a simple structure, can be operated repeatedly and has high accuracy;
the motor is arranged at the top of the temperature regulating box, the impeller arranged in the temperature regulating box is connected through the stirring shaft, the stirring shaft penetrates through the heat exchanger, and the motor drives the impeller to rotate, so that the cooling of a refrigerating medium can be more uniform and rapid;
the gas phase converter is made of organic glass, the temperature regulating box is cylindrical, an observation window is arranged on one side, close to the gas phase converter, of the temperature regulating box, and the observation window is made of optical glass and can realize visualization of a liquefaction process of the mixed insulating gas;
the technical scheme provided by the invention can accurately detect the liquefaction temperatures of different mixed insulating gases, and the detection result is reliable;
the gas phase converter is internally provided with a pressure sensor and a temperature sensor, the temperature regulating box is also internally provided with the temperature sensor, the two temperature sensors are arranged, the set temperature value is corrected in real time, and the detection result is basically consistent with the liquefaction temperature in engineering application;
according to the technical scheme provided by the invention, the mixed insulating gas is cooled to be liquefied, the pressure and the temperature in the gas phase converter are recorded, and a temperature-pressure curve is drawn, so that the liquefaction temperature of the mixed insulating gas can be obtained, and the whole test process is simple and has strong repeatability.
Drawings
Fig. 1 is a structural diagram of a visual detection system for the liquefaction temperature of a mixed insulating gas in embodiment 1 of the present invention;
in FIG. 1, 1-a first gas inlet, 2-a first pressure reducing valve, 3-a first mass flow meter, 4-a second gas inlet, 5-a second pressure reducing valve, 6-a second mass flow meter, 7-a mixing tank, 8-a booster pump, 9-a pressure gauge, 10-a vacuum pump, 11-a regulating valve, 12-a gas phase converter, 13-a temperature regulating box, 14-a motor, 15-an impeller, 16-a heat exchanger, 17-a refrigerator, 18-a pressure sensor provided in the gas phase converter, 19-a temperature sensor provided in the gas phase converter, 20-a temperature sensor provided in the temperature regulating box, 21-an observation window, and 22-a display screen.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1
Embodiment 1 of the invention provides a visual detection system for liquefied temperature of mixed insulating gas, a structure diagram of which is shown in fig. 1 and is used for detecting C4F7N and CO2The liquefaction temperature of the mixed insulating gas is obtained by mixing, and the visual detection system for the liquefaction temperature of the mixed insulating gas provided by the embodiment 1 of the invention comprises a gas supply unit, a mixing unit, a phase conversion unit, a refrigeration unit and a control unit which are sequentially connected;
the air supply unit comprises two air supply branches;
wherein the mixing unit comprises a mixing tank 7 and a pressure regulating assembly;
the phase conversion unit comprises a temperature regulation box 13, a gas phase converter 12 arranged in the temperature regulation box 13 and a heat exchanger 16 connected with the refrigeration unit;
the control unit is connected to a temperature sensor 20 provided in the temperature adjustment tank 13, a pressure sensor 18 and a temperature sensor 19 in the gas phase converter 12, and a refrigeration unit.
The gas supply branch comprises a gas inlet, a pressure reducing valve and a mass flow meter which are connected in sequence, a first gas supply branch in embodiment 1 of the invention comprises a first gas inlet 1, a first pressure reducing valve 2 and a first mass flow meter 3, a second gas supply branch comprises a second gas inlet 4, a second pressure reducing valve 5 and a second mass flow meter 6, and C is introduced into the first pressure reducing valve 2 through the first gas inlet 14F7N, CO entering the second pressure reducing valve 5 through the second inlet 42。
The pressure regulating assembly comprises a booster pump 8, a pressure gauge 9, a vacuum pump 10 and a regulating valve 11;
the output end of the mass flow meter is connected with the input end of the mixing tank 7, the output end of the mixing tank 7 is connected with the regulating valve 11 through the booster pump 8, and the regulating valve 11 is connected with the gas phase converter 12 through a gas supply pipeline; the pressure gauge 9 and the vacuum pump 10 are arranged on a pipeline between the booster pump 8 and the regulating valve 11;
the regulating valve 11 is a needle-type regulating valve.
The visual detection system for the liquefaction temperature of the mixed insulating gas provided by the embodiment 1 of the invention further comprises a motor 14 and an impeller 15, wherein the impeller 15 is composed of three aluminum sheets, the motor 14 is arranged at the top of the temperature regulation box 13 and is connected with the impeller 15 arranged in the temperature regulation box 13 through a stirring shaft, the stirring shaft penetrates through a heat exchanger 16, the heat exchanger 16 adopts a coil pipe, and the coil pipe is made of stainless steel. The coil is formed by spirally winding a stainless steel pipe with the diameter of 6mm multiplied by 1mm, and has large contact area with a refrigerating medium and better cooling effect. The coil pipe is connected with a refrigerator 17 in the refrigeration unit through a stainless steel pipe, and the temperature regulation range of the refrigerator 17 is as follows: the temperature is-80 ℃ to +35 ℃, and the temperature can be adjusted within the range.
The temperature adjusting box 13 is filled with a refrigerating medium ((the refrigerating medium is selected from liquid nitrogen or industrial alcohol, is cooled by an evaporator of a refrigerating machine 17 through an outlet of a stainless steel pipe, and then enters the temperature adjusting box 13 through an inlet of the stainless steel pipe), the gas phase converter 12 and the heat exchanger 16 are respectively arranged at the middle position of the left half part and the middle position of the right half part of the temperature adjusting box 13, the temperature sensor 20 arranged in the temperature adjusting box 13 is positioned between the gas phase converter 12 and the heat exchanger 16, and the pressure sensor 18 and the temperature sensor 19 in the gas phase converter 12 are positioned at the middle position of the gas phase converter 12 (the pressure sensor 18 is arranged at a position 20mm away from the converter cover).
The gas phase converter 12 is cylindrical and comprises a converter body and a converter cover, wherein the height of the converter body is 3-4 times of the inner diameter; the height of the converter body is 90mm, the inner diameter is 30mm, and the converter body is 80mm away from the inner bottom surface of the temperature adjusting box 13. The converter body is made of organic glass, and the converter cover is made of stainless steel.
The temperature adjusting box 13 is cylindrical and comprises a stainless steel box body and a box cover; the inner cavity of the temperature adjusting box 13 is 250mm in inner diameter and 250mm in height, the outer cavity of the temperature adjusting box 13 is 350mm in inner diameter and 300mm in height, and heat insulation cotton (aluminum-plated polyester film) is filled between the outer cavity and the inner cavity to reduce heat loss. The box cover is made of a stainless steel plate with the inner diameter of 350mm and the thickness of 50 mm.
An observation window is arranged on one side of the stainless steel box body close to the gas phase converter 12, and the observation window is made of optical glass. The observation window may be an annular observation window, the lower edge of which is at the same height as the gas phase converter 12; the observation window also can be 2 round holes, and 2 round holes symmetry set up, and the diameter is 30mm, and the lower limb of 2 round holes is higher than 12 bottoms of gas phase converter 2 ~ 3 cm.
The gas supply pipeline, the capillary pipeline between the pressure sensor 18 and the control module, and the capillary pipeline between the temperature sensor 19 in the gas phase converter 12 and the control module respectively penetrate through the box cover and the converter cover in sequence, and are sealed with the cavity cover by polytetrafluoroethylene and rubber rings.
The control unit described above includes:
a display screen for displaying the pressure and temperature inside the gas phase converter 12 detected by the pressure sensor 18 and the temperature sensor 19, respectively, inside the gas phase converter 12, and the temperature inside the temperature adjusting tank 13 detected by the temperature sensor 20 provided inside the temperature adjusting tank 13;
a controller for comparing the internal temperature of the gas phase converter 12 displayed on the display screen with a first set temperature, and recording the temperature and pressure at that time if the internal temperature of the gas phase converter 12 displayed on the display screen is equal to the first set temperature; if the internal temperature of the gas phase converter 12 displayed by the display screen is higher than the first set temperature, the controller issues a start command to the refrigerator 17, the refrigerator 17 continues to work until the internal temperature of the gas phase converter 12 displayed by the display screen reaches the first set temperature, and the temperature and the pressure at the moment are recorded; if the internal temperature of the gas phase converter 12 displayed by the display screen is lower than the first set temperature, the controller gives a stop command to the refrigerator 17, the refrigerator 17 stops working until the internal temperature of the gas phase converter 12 displayed by the display screen reaches the first set temperature, records the temperature and the pressure at the moment, compares the internal temperature of the gas phase converter 12 displayed by the display screen with different set temperatures in sequence, executes the same operation until the internal temperature of the gas phase converter 12 displayed by the display screen reaches the lowest set temperature, and records the temperature and the pressure at the moment.
Example 2
s101: respectively vacuumizing an internal pipeline of the gas supply unit, an internal pipeline of the mixing unit and the gas phase converter 12 through a vacuum pump 10 in the pressure regulating assembly, preparing mixed insulating gas through the gas supply unit and the mixing tank 7, and filling the mixed insulating gas into the gas phase converter 12 through the pressure regulating assembly;
s102: starting a refrigerating machine 17 in the refrigerating unit, cooling the refrigerating medium in the temperature adjusting box 13 (the temperature in the gas phase converter 12 is gradually reduced, and when the temperature in the gas phase converter 12 is reduced to a set temperature, the mixed insulating gas begins to liquefy), and simultaneously, the motor 14 drives the impeller 15 to rotate at a set speed, so that the refrigerating medium can exchange heat quickly and uniformly;
s103: in the cooling process, when the temperature is reduced by 2 ℃, the temperature is continuously set for a period of time at the corresponding temperature; the pressure and the temperature inside the gas phase converter 12 are collected in real time through a pressure sensor 18 and a temperature sensor 19, and the temperature inside the temperature adjusting box 13 is collected in real time through a temperature sensor 20;
s104: comparing the internal temperature of the gas phase converter 12 displayed by the display screen with a first set temperature, and recording the internal temperature and pressure of the gas phase converter 12 displayed by the display screen at the moment if the internal temperature of the gas phase converter 12 displayed by the display screen is equal to the first set temperature (set to 20 ℃); if the internal temperature of the gas phase converter 12 displayed by the display screen is higher than the first set temperature, the controller issues a start command to the refrigerator 17, the refrigerator 17 continues to work until the internal temperature of the gas phase converter 12 displayed by the display screen reaches the first set temperature, and the temperature and the pressure at the moment are recorded; if the internal temperature of the gas phase converter 12 displayed by the display screen is lower than the first set temperature, the controller gives a stop command to the refrigerator 17, the refrigerator 17 stops working until the internal temperature of the gas phase converter 12 displayed by the display screen reaches the first set temperature, and the temperature and the pressure at the moment are recorded; then comparing the internal temperature of the gas phase converter 12 displayed by the display screen with a second set temperature (18 ℃), and recording the temperature and the pressure at the moment if the internal temperature of the gas phase converter 12 displayed by the display screen is equal to the second set temperature; if the internal temperature of the gas phase converter 12 displayed by the display screen is higher than the second set temperature, the controller issues a start command to the refrigerator 17, the refrigerator 17 continues to work until the internal temperature of the gas phase converter 12 displayed by the display screen reaches the second set temperature, and the temperature and the pressure at the moment are recorded; if the internal temperature of the gas phase converter 12 displayed by the display screen is lower than the second set temperature, the controller gives a stop command to the refrigerator 17, the refrigerator 17 stops working until the internal temperature of the gas phase converter 12 displayed by the display screen reaches the second set temperature, and the temperature and the pressure at the moment are recorded; sequentially comparing the internal temperature of the gas phase converter 12 displayed by the display screen with other set temperatures, and executing the same operation until the internal temperature of the gas phase converter 12 displayed by the display screen reaches the lowest set temperature (-50 ℃), and recording the temperature and the pressure at the moment;
s105: and drawing a temperature-pressure curve according to the recorded temperature and pressure, wherein the temperature-pressure curve consists of three sections, the first section is a curve that the pressure in the high-temperature region does not change obviously along with the temperature reduction, the second section is a curve that the pressure in the low-temperature region rapidly decreases along with the temperature reduction, and the third section is a curve that the pressure in the ultra-low temperature region does not change obviously along with the temperature reduction, and the liquefaction temperature of the mixed insulating gas is obtained according to the temperature-pressure curve. Specifically, the second section curve and the third section curve are tangent lines, and the intersection point of the two tangent lines is the liquefaction temperature of the mixed insulating gas.
For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware when implementing the present application.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.
Claims (1)
1. A method for detecting the liquefaction temperature of mixed insulating gas by adopting a visual detection system of the liquefaction temperature of the mixed insulating gas is characterized in that,
the visual detection system for the liquefaction temperature of the mixed insulating gas comprises a gas supply unit, a mixing unit, a phase inversion unit, a refrigeration unit and a control unit which are sequentially connected;
the air supply unit comprises at least two air supply branches;
the mixing unit comprises a mixing tank and a pressure regulating assembly;
the phase conversion unit comprises a temperature regulation box, a gas phase converter arranged in the temperature regulation box and a heat exchanger connected with the refrigeration unit;
the control unit is connected with a temperature sensor arranged in the temperature adjusting box, a pressure sensor and a temperature sensor in the gas phase converter and a refrigerating unit;
the gas supply branch comprises a gas inlet, a pressure reducing valve and a mass flowmeter which are connected in sequence;
the pressure regulating assembly comprises a booster pump, a pressure gauge, a vacuum pump and a regulating valve;
the output end of the mass flow meter is connected with the input end of the mixing tank, the output end of the mixing tank is connected with the regulating valve through the booster pump, and the regulating valve is connected with the gas phase converter through the gas supply pipeline; the pressure gauge and the vacuum pump are arranged on a pipeline between the booster pump and the regulating valve;
the regulating valve is a needle type regulating valve;
the system also comprises a motor and an impeller, wherein the motor is arranged at the top of the temperature regulating box and is connected with the impeller arranged in the temperature regulating box through a stirring shaft, the stirring shaft penetrates through a heat exchanger, the heat exchanger is a coil pipe, and the coil pipe is made of stainless steel;
the temperature adjusting box is filled with a refrigerating medium, the gas phase converter and the heat exchanger are respectively arranged at the middle position of the left half part and the middle position of the right half part of the temperature adjusting box, the temperature sensor arranged in the temperature adjusting box is positioned between the gas phase converter and the heat exchanger, and the pressure sensor and the temperature sensor in the gas phase converter are positioned at the middle position of the gas phase converter;
the gas phase converter is cylindrical and comprises a converter body and a converter cover, wherein the height of the converter body is 3-4 times of the inner diameter;
the converter body is made of organic glass, and the converter cover is made of stainless steel;
the temperature adjusting box is cylindrical and comprises a stainless steel box body and a box cover;
an observation window is arranged on one side of the stainless steel box body close to the gas phase converter, and the observation window is made of optical glass;
the gas supply pipeline, the capillary pipeline between the pressure sensor and the control module and the capillary pipeline between the temperature sensor and the control module in the gas phase converter respectively penetrate through the box cover and the converter cover in sequence, and are sealed with the cavity cover by polytetrafluoroethylene and a rubber ring;
the control unit comprises a display screen for displaying the internal pressure and temperature of the gas phase converter respectively detected by a pressure sensor and a temperature sensor which are positioned in the gas phase converter and the internal temperature of the temperature regulating box detected by the temperature sensor which is arranged in the temperature regulating box;
the control unit comprises a controller, and the refrigeration unit comprises a refrigerator;
the controller compares the internal temperature of the gas phase converter displayed by the display screen with a first set temperature, and records the temperature and the pressure at the moment if the internal temperature of the gas phase converter displayed by the display screen is equal to the first set temperature; if the internal temperature of the gas phase converter displayed by the display screen is higher than the first set temperature, the controller issues a starting command to the refrigerator, the refrigerator continues to work until the internal temperature of the gas phase converter displayed by the display screen reaches the first set temperature, and the temperature and the pressure at the moment are recorded; if the internal temperature of the gas phase converter displayed by the display screen is lower than the first set temperature, the controller gives a stop command to the refrigerator, the refrigerator stops working until the internal temperature of the gas phase converter displayed by the display screen reaches the first set temperature, records the temperature and the pressure at the moment, compares the internal temperature of the gas phase converter displayed by the display screen with different set temperatures in sequence, executes the same operation until the internal temperature of the gas phase converter displayed by the display screen reaches the lowest set temperature, and records the temperature and the pressure at the moment;
the method comprises the following steps:
respectively vacuumizing an internal pipeline of the gas supply unit, an internal pipeline of the mixing unit and the gas phase converter by a vacuum pump in the pressure regulating assembly, preparing mixed insulating gas by the gas supply unit and the mixing tank, and filling the mixed insulating gas into the gas phase converter by the pressure regulating assembly;
starting a refrigerating machine in the refrigerating unit to cool the refrigerating medium in the temperature adjusting box, and simultaneously driving the impeller to rotate at a set speed by the motor to ensure that the refrigerating medium exchanges heat quickly and uniformly;
the pressure and the temperature in the gas phase converter are collected in real time through a pressure sensor and a first temperature sensor, and the temperature in the temperature adjusting box is collected in real time through a second temperature sensor;
comparing the internal temperature of the gas phase converter displayed by the display screen with a first set temperature, and recording the temperature and the pressure at the moment if the internal temperature of the gas phase converter displayed by the display screen is equal to the first set temperature; if the internal temperature of the gas phase converter displayed by the display screen is higher than the first set temperature, the controller issues a starting command to the refrigerator, the refrigerator continues to work until the internal temperature of the gas phase converter displayed by the display screen reaches the first set temperature, and the temperature and the pressure at the moment are recorded; if the internal temperature of the gas phase converter displayed by the display screen is lower than the first set temperature, the controller gives a stop command to the refrigerator, the refrigerator stops working until the internal temperature of the gas phase converter displayed by the display screen reaches the first set temperature, records the temperature and the pressure at the moment, compares the internal temperature of the gas phase converter displayed by the display screen with different set temperatures in sequence, executes the same operation until the internal temperature of the gas phase converter displayed by the display screen reaches the lowest set temperature, and records the temperature and the pressure at the moment;
and drawing a temperature-pressure curve according to the recorded temperature and pressure, and obtaining the liquefaction temperature of the mixed insulating gas according to the temperature-pressure curve.
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| US5981290A (en) * | 1997-04-07 | 1999-11-09 | The United States Of America As Represented By The Secretary Of Transportation | Microscale combustion calorimeter |
| JP3982402B2 (en) * | 2002-02-28 | 2007-09-26 | 東京エレクトロン株式会社 | Processing apparatus and processing method |
| CN104077943B (en) * | 2014-07-08 | 2016-05-04 | 浙江大学 | A kind of visual experimental apparatus of profound hypothermia condensing heat-exchange process |
| CN105132060B (en) * | 2015-07-24 | 2018-04-10 | 大连理工大学 | CO in a kind of low temperature pressure swing adsorption technique purified natural gas2Devices and methods therefor |
| CN106680681A (en) * | 2017-03-30 | 2017-05-17 | 沈阳工业大学 | Device and method for detecting low temperature breakdown voltage and spectrum of mixed gas |
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