CN212840678U - Vacuum obtaining system for vacuum multilayer heat insulation low-temperature container interlayer - Google Patents
Vacuum obtaining system for vacuum multilayer heat insulation low-temperature container interlayer Download PDFInfo
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- CN212840678U CN212840678U CN202021625180.XU CN202021625180U CN212840678U CN 212840678 U CN212840678 U CN 212840678U CN 202021625180 U CN202021625180 U CN 202021625180U CN 212840678 U CN212840678 U CN 212840678U
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Abstract
The utility model discloses an interbedded vacuum of adiabatic low temperature container of vacuum multilayer obtains system, it includes: the inner container heating and cooling circulation system is connected with the inner container of the vacuum multilayer heat-insulation low-temperature container and is used for circularly heating or cooling the inner container of the vacuum multilayer heat-insulation low-temperature container; the outer container heating and cooling circulating system is used for placing the vacuum multilayer heat-insulation low-temperature container in the outer container and circularly heating or cooling the outer container of the vacuum multilayer heat-insulation low-temperature container; the micro-positive pressure nitrogen flushing and replacing system is connected with the interlayer and is used for replacing gas in the interlayer; the vacuumizing unit is connected with the interlayer and is used for vacuumizing the interlayer; and the control system is used for controlling the inner container heating and cooling circulating system, the outer container heating and cooling circulating system, the micro-positive pressure nitrogen flushing and replacing system and the vacuumizing unit. Adopt the technical scheme that the utility model relates to, the gaseous replacement of intermediate layer is effectual, helps improving the pump-out efficiency of replacement nitrogen gas, obtains lasting high vacuum life-span.
Description
Technical Field
The utility model belongs to the technical field of the interbedded evacuation of low temperature vacuum insulation container, especially, relate to an interbedded vacuum of vacuum multilayer insulation low temperature container obtains the system that can thoroughly replace intermediate layer moisture and other noncondensable gas molecules, show the improvement vacuum.
Background
With the wider application range of the frozen liquefied gas, the requirement on the heat insulation performance of a device for storing and transporting the frozen liquefied gas is higher, and particularly, containers for storing and transporting cryogenic low-temperature liquid such as liquid oxygen, liquid nitrogen, liquid hydrogen, liquid argon, LNG and the like can meet the heat insulation requirement only by selecting a high-vacuum multi-layer heat insulation structure. The container has high requirement on interlayer vacuum, and the interlayer cold working vacuum degree in the whole interlayer vacuum life cycle (the national standard requires 5 years) of the container is required to be superior to 0.03Pa (absolute pressure). Therefore, the interlayer vacuum is one of important indexes influencing the heat insulation performance of the low-temperature container, and is an important technical link in the manufacturing and maintenance process of the vacuum multi-layer heat insulation container.
In the case of structural solidification, the interlayer vacuum is the only index affecting the heat insulation performance of the vacuum multi-layer heat insulation cryogenic container. The traditional interlayer vacuum pumping process has the defects of large energy consumption, long consumed time, high labor consumption, short service life of the obtained vacuum and the like; in addition, the multilayer heat insulation container is covered with a multilayer heat insulation material on the inner container, the heat insulation material is formed by stacking dozens of layers or even hundreds of layers of film materials and then is wound on the inner container, and the multilayer heat insulation container has the characteristics of small heat conductivity coefficient, more layers, large surface area, tight arrangement and the like, and the characteristics cause the multilayer heat insulation material to have the problems of poor heat transfer, large adsorbed gas amount, difficult desorption of adsorbed gas and the like.
In view of the above problems, patent CN101021209A discloses a vacuum pumping method and a device thereof, comprising: a first gas delivery device having a gas outlet; the inlet of the first gas heater is communicated with the gas outlet of the first gas conveying device, and the outlet of the first gas heater is communicated with the gas inlet of the inner cylinder; the vacuumizing unit is communicated with the interlayer; a second gas delivery device having a gas outlet; and the inlet of the second gas heater is communicated with the gas outlet of the second gas conveying device, and the outlet of the second gas heater is communicated with the interlayer. The solutions referred to in the above patents have the following problems: only the inner cylinder body is heated, heat hardly penetrates through the heat insulation material coated on the inner container, the middle and outer heat insulation materials cannot be effectively heated, the interlayer replacement heat efficiency is low, and replacement is not thorough; when the nitrogen in the interlayer is replaced, the nitrogen is closed and stays, the heat preservation effect is poor, the replacement effect is not ideal, and the replacement efficiency is low; by using the liquid nitrogen cold trap, liquid nitrogen needs to be monitored and filled at any time, so that the operation difficulty is increased, the conductance of a vacuum pumping pipeline is reduced, and the vacuum pumping effect is influenced; the moisture in the heat insulating material in the interlayer is difficult to completely remove, and the residual moisture can continuously release moisture after vacuum sealing, so that the vacuum degree of the interlayer is gradually reduced, the vacuum service life is shortened, and the heat insulating property is reduced.
Another more advanced technical proposal is an evacuation system and method for a large-volume low-temperature heat-insulating container disclosed in patent No. CN102913749A, the system includes a gas supply device, an evacuation device and a heating device; the heating device comprises an outer tank heating device and an inner tank heating device; the heat-insulating container to be vacuumized comprises an outer tank, an inner tank and an interlayer formed by the outer tank and the inner tank; the outer tank heating device is arranged outside the outer tank of the heat-insulating container to be vacuumized; the inner tank heating device is arranged inside the inner tank of the heat-insulating container to be vacuumized; the air supply device is communicated with the inner tank of the heat-insulating container to be vacuumized and the interlayer through pipelines respectively; the vacuumizing device is communicated with the inner tank of the heat-insulating container to be vacuumized and the interlayer through pipelines respectively. This technical heating device includes outer jar heating device and inner tank heating device, and middle part and outside intermediate layer heat-insulating material can effectively heat, and the intermediate layer replacement heat efficiency is high, can promote the replacement effect to a certain extent. However, the interlayer replacement still adopts a closed inflation mode, so that the phenomenon of over-inflation or under-inflation is easy to occur during actual operation, and the effect of the replacement mode is still not ideal; in addition, the external heating adopts an electric heating plate, so that the production line of mass production large containers has high energy consumption and high cost, and the phenomenon of nonuniform heating is easily caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that the vacuum pumping effect of the vacuum multi-layer heat insulation low-temperature container interlayer is not good in the prior art, the vacuum multi-layer heat insulation low-temperature container interlayer vacuum obtaining system which can thoroughly replace interlayer moisture and other non-condensable gas molecules and obviously improve the vacuum degree is provided.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model relates to an interbedded vacuum of adiabatic low temperature container of vacuum multilayer obtains system, the adiabatic low temperature container of vacuum multilayer includes outer container and sets up the inner container inside outer container, is the intermediate layer between outer container and the inner container promptly, and this vacuum obtains the system and includes:
the inner container heating and cooling circulating system is connected with the inner container and is used for circularly heating or cooling the inner container;
the outer container heating and cooling circulating system is used for circularly heating or cooling the outer container;
the micro-positive pressure nitrogen flushing and replacing system is connected with the interlayer and is used for replacing gas in the interlayer;
the vacuumizing unit is connected with the interlayer and is used for vacuumizing the interlayer;
and the control system is used for controlling the inner container heating and cooling circulating system, the outer container heating and cooling circulating system, the micro-positive pressure nitrogen flushing and replacing system and the vacuumizing unit.
Preferably, the inner container heating and cooling circulation system comprises a first circulating fan, a first gas heater and an inner container cooling air inlet valve, wherein an air outlet end of the first circulating fan is connected with an air inlet end of the first gas heater, the air outlet end of the first gas heater and the air inlet end of the first circulating fan are both connected with an inner container of the vacuum multilayer heat-insulation low-temperature container, an inner container cooling exhaust valve is also connected with an air inlet end of the first circulating fan, an inner container air inlet valve is further connected between the first gas heater and the inner container, an inner container cooling exhaust valve and an inner container air outlet valve are further sequentially connected between the first circulating fan and the inner container, and the inner container cooling air inlet valve is matched with a filter; the first circulating fan, the first gas heater, the inner container air inlet valve, the cooling exhaust valve, the inner container air outlet valve and the inner container cooling air inlet valve are all in communication connection with the control system.
Preferably, the inner container heating and cooling circulation system further comprises an inner container air inlet temperature sensor and an inner container air outlet temperature sensor, the inner container air inlet temperature sensor is connected between an inner container air inlet valve and the inner container, the inner container air outlet temperature sensor is connected between the inner container and an inner container cooling exhaust valve, and the inner container air inlet temperature sensor and the inner container air outlet temperature sensor are both in communication connection with the control system.
Preferably, the outer container heating and cooling circulating system comprises a drying room, a second circulating fan, a second gas heater, a drying room cooling exhaust fan and a drying room cooling air inlet valve; a drying room bottom gas channel is arranged at a position close to the bottom in the drying room, a drying room top gas channel is arranged at a position close to the top, and the drying room cooling exhaust fan and the drying room cooling air inlet valve are both fixed on the drying room and communicated with the inside of the drying room; the air outlet end of the second circulating fan is connected with the air inlet end of the second air heater, the air outlet end of the second air heater is connected with the air channel at the bottom of the drying room, and the air inlet end of the second circulating fan is connected with the air channel at the top of the drying room; and the second circulating fan, the second gas heater, the drying room cooling exhaust fan and the drying room cooling air inlet valve are all in communication connection with the control system.
Preferably, the outer container heating and cooling circulation system further comprises a drying room air inlet temperature sensor, a drying room air outlet temperature sensor and a drying room temperature sensor; the drying room air inlet temperature sensor is connected between the second air heater and the drying room bottom air channel, the drying room air outlet temperature sensor is connected between the second circulating fan and the drying room top air channel, and the drying room temperature sensor is arranged in the drying room; the drying room air inlet temperature sensor, the drying room air outlet temperature sensor and the drying room temperature sensor are all in communication connection with the control system.
Preferably, a high vacuum baffle valve, an integrated measuring chamber and an interlayer evacuating valve are sequentially connected between the vacuumizing unit and the interlayer, a balance valve and a vacuum sensor are arranged on the integrated measuring chamber, and the high vacuum baffle valve, the interlayer evacuating valve, the balance valve and the vacuum sensor are all in communication connection with a control system.
Preferably, the micro-positive pressure nitrogen flushing and replacing system comprises a nitrogen source, a third gas heater, an automatic air outlet control valve and a pressure sensor; the gas inlet end of the third gas heater is connected with a nitrogen source, the gas outlet end of the third gas heater is connected to the integrated measuring chamber, an interlayer gas inlet control valve is connected between the third gas heater and the integrated measuring chamber, the automatic gas outlet control valve is connected to an outer container interlayer explosion-proof device port through a pipeline, and the pressure sensor is connected to the integrated measuring chamber; and the third gas heater, the interlayer gas inlet control valve, the pressure sensor and the automatic gas outlet control valve are in communication connection with the control system.
Preferably, the micro-positive pressure nitrogen flushing and replacing system further comprises a nitrogen pressure sensor, an interlayer air inlet temperature sensor, an interlayer air outlet temperature sensor and an interlayer vacuum gauge pipe for detecting the interlayer vacuum degree; the nitrogen pressure sensor is connected between a nitrogen source and the third gas heater, the interlayer air inlet temperature sensor is connected between the third gas heater and the integrated measuring chamber, the interlayer air outlet temperature sensor is connected between the interlayer and the automatic air outlet control valve, and the interlayer vacuum gauge pipe is connected with the interlayer; and the nitrogen pressure sensor, the interlayer air inlet temperature sensor, the interlayer vacuum gauge pipe and the interlayer air outlet temperature sensor are in communication connection with the control system.
Compared with the prior art, adopt the utility model provides a technical scheme has following technological effect:
1. the utility model discloses use flowing nitrogen gas to wash replacement system cooperation evacuation unit to the intermediate layer gas and replace, nitrogen gas washes replacement system includes the nitrogen gas source, third gas heater and the automatic control flap of giving vent to anger, fill the nitrogen gas of heating on one side in the replacement process, release replacement gas on one side, and make intermediate layer pressure control at 110KPa ~ 130KPa, form the negative pressure between the relative heat-insulating material layer in intermediate layer space when managing to find time, can make deep heat-insulating material gasification moisture and noncondensable gas by the desorption, reach the intermediate layer space after passing top layer heat-insulating material, the moisture of intermediate layer material desorption, noncondensable gas composition desorption is wrapped up in by the nitrogen gas that flows at once after to the intermediate layer space and is taken off the intermediate layer space by the clamp, the phenomenon that can not take place.
2. The utility model relates to an interbedded vacuum of adiabatic low temperature container of vacuum multilayer obtains system has set up inner container heating cooling circulation system and outer container heating cooling circulation system, respectively to synchronous continuous heating of inner container and outer container, the heat can evenly pierce through whole heat-insulating material, make each layer of heat-insulating material temperature all be higher than 100 ℃, the adsorbed moisture of all heat-insulating material all can gasify and the desorption, when further adopting pressure-fired nitrogen gas to wash replacement system replacement interbedded gas, moisture and other gas molecules in the replacement container intermediate layer that can be thorough, and help high efficiency to take out replacement nitrogen gas from the intermediate layer, make the intermediate layer obtain lasting high vacuum life; and the outer container is heated by adopting the outer container heating and cooling circulating system, and compared with the traditional method for heating the outer container by adopting an electric heating plate, the method has the advantages of low energy consumption, low cost, uniform heating and the like.
3. The utility model has the advantages that a liquid nitrogen cold trap is not needed to be arranged between the vacuumizing unit and the interlayer, the flow conductance of the vacuumizing pipeline is increased, the vacuumizing efficiency is improved, the operation is simplified, the workload is reduced, the cost is saved, and the device is green and energy-saving; after the high-temperature evacuation is finished, an inner container heating and cooling circulation system and an outer container heating and cooling circulation system are adopted to apply a forced cooling measure to the inner container and the outer container, so that the time of occupying a drying room by a product is shortened, the cost is saved, and the efficiency is improved.
Drawings
Fig. 1 is a schematic view of a vacuum gain system for a sandwich of a vacuum multilayer insulated cryogenic container according to the present invention;
fig. 2 is a schematic view of the heating and cooling circulation system of the present invention;
FIG. 3 is a schematic view of an external container heating and cooling cycle system of the present invention;
FIG. 4 is a schematic view of the combination of the micro-positive pressure nitrogen flushing and displacing system and the vacuum pumping unit of the present invention;
FIG. 5 is a diagram of the change of the low temperature pressure of the retest interlayer.
Wherein: 1. a drying room air outlet temperature sensor; 2. a drying room cooling exhaust fan; 3. a drying room; 4. a drying room top air channel; 5. an outer container; 6. a heat insulating layer; 7 an inner container; 8. an inner container air intake temperature sensor; 9. a drying room cooling air inlet valve; 10. an inner container air outlet temperature sensor; 11. an inner container air inlet valve; 12. an inner container cooling exhaust valve; 13. a first gas heater; 14. an air outlet valve of the inner container; 15. a filter; 16. the inner container cooling air inlet valve; 17. a first circulating fan; 18. a control system; 19. a pressure sensor; 20. a high vacuum flapper valve; 21. a vacuumizing unit; 22. an integrated measurement chamber; 23. an interlayer air inlet control valve; 24. an interlayer intake air temperature sensor; 25. a balancing valve; 26. a third gas heater; 27. a nitrogen pressure sensor; 28. a vacuum sensor; 29. a nitrogen source; 30. an interlayer evacuation valve; 31. a vacuum gauge pipe is arranged in the interlayer; 32. a drying room bottom gas channel; 33. a drying room air inlet temperature sensor; 34. a second gas heater; 35. a second circulating fan; 36. a drying room temperature sensor; 37. an automatic air outlet control valve; 38. and an interlayer air outlet temperature sensor.
Detailed Description
In order to deepen the understanding of the present invention, the present invention will be further described in detail with reference to the following embodiments and the attached drawings, and the embodiments are only used for explaining the present invention, and do not constitute the limitation to the protection scope of the present invention.
Referring to the attached drawing 1, the utility model relates to an intermediate layer vacuum obtaining system of vacuum multilayer heat insulation low temperature container is used for carrying out the evacuation to the intermediate layer of vacuum multilayer heat insulation low temperature container, vacuum multilayer heat insulation low temperature container include outer container 5 and inner container 7, there is the intermediate layer between outer container 5 and the inner container 7, the periphery of inner container 7 is equipped with heat insulation layer 6, this heat insulation layer 6 is rolled up on inner container 7 after stacking by tens of layers or even hundreds of layers of film materials, have characteristics such as coefficient of heat conductivity is little, the number of piles is many, make the adiabatic performance of vacuum multilayer heat insulation low temperature container better.
Referring to fig. 1, the vacuum obtaining system includes: the inner container heating and cooling circulation system is connected with the inner container of the vacuum multilayer heat-insulation low-temperature container and is used for circularly heating or cooling the inner container of the vacuum multilayer heat-insulation low-temperature container; the outer container heating and cooling circulating system is used for placing the vacuum multilayer heat-insulation low-temperature container in the outer container and circularly heating or cooling the outer container of the vacuum multilayer heat-insulation low-temperature container; the micro-positive pressure nitrogen flushing and replacing system is connected with the interlayer and is used for replacing gas in the interlayer; the vacuumizing unit is connected with the interlayer and is used for vacuumizing the interlayer; and the control system is used for controlling the inner container heating and cooling circulating system, the outer container heating and cooling circulating system, the micro-positive pressure nitrogen flushing and replacing system and the vacuumizing unit.
Referring to fig. 1 and 2, the inner container heating and cooling circulation system includes a first circulation fan 17, a first gas heater 13 and an inner container cooling inlet valve 16, an outlet end of the first circulation fan 17 is connected with an inlet end of the first gas heater 13, the outlet end of the first gas heater 13 and an inlet end of the first circulation fan 17 are both connected with the inner container 7 of the vacuum multilayer heat-insulating low-temperature container, an inner container cooling exhaust valve 15 is also connected with an inlet end of the first circulation fan 17, an inner container inlet valve 11 for controlling the inlet of the inner container heating and cooling circulation system is further connected between the first gas heater 13 and the inner container 7, an inner container cooling exhaust valve 12 and an outlet valve 14 for controlling the outlet of the inner container heating and cooling circulation system are further connected between the first circulation fan 17 and the inner container 7 in sequence, the inner container cooling inlet valve 16 is matched with a filter 15 for filtering the inner container heating and cooling circulation system gas, the inner vessel cooling vent valve 12 is used to vent the hot gas in the inner vessel 7 during cooling of the inner vessel 7; the first circulating fan 17, the first gas heater 13, the inner container air inlet valve 11, the cooling exhaust valve 12, the inner container air outlet valve 12 and the inner container cooling air inlet valve 16 are all in communication connection with the control system 18 and are driven to be switched by the control system 18, the gas conveyed by the first circulating fan 17 is nitrogen or dry air, and the first gas heater 13 can be heated by using natural gas energy or electric energy.
In the process of cyclic heating, the valves of the inner container air inlet valve 11 and the inner container air outlet valve 14 are opened, the inner container air outlet valve 12 is closed, the gas heats the inner container 7 and is recycled and reused by the first circulating fan 17 and the first gas heater 13, the residual temperature of the gas is fully utilized, and the energy consumption of the heated gas is reduced; in the process of cooling the inner container, the first gas heater 13 and the inner container gas outlet valve 14 are closed, the inner container cooling gas inlet valve 16, the inner container gas inlet valve 11 and the inner container gas outlet valve 12 are opened, normal temperature gas is input into the inner container, and high temperature gas in the inner container 7 is discharged from the inner container gas outlet valve 12.
Referring to fig. 1 and 2, the inner container heating and cooling circulation system further comprises an inner container inlet air temperature sensor 8 and an inner container outlet air temperature sensor 10, the inner container inlet air temperature sensor 8 is connected between an inner container inlet valve 11 and the inner container 7 and used for measuring the temperature of the gas input into the inner container heating and cooling circulation system, the inner container outlet air temperature sensor 10 is connected between the inner container 7 and an inner container cooling exhaust valve 12 and used for measuring the outlet air temperature of the inner container heating and cooling circulation system, and the inner container inlet air temperature sensor 8 and the inner container outlet air temperature sensor 10 are both in communication connection with a control system and transmit temperature information to the control system for display. In the cyclic heating process, the control system turns on or off the first gas heater 13 according to the temperatures tested by the inner container air inlet temperature sensor 8 and the inner container air outlet temperature sensor 10; in the cooling process, the container gas outlet temperature sensor 10 detects the temperature of the exhaust gas, and when the detected temperature is the same as the room temperature, the cooling is stopped.
Referring to fig. 1 and 3, the outer container heating and cooling circulation system includes a drying room 3, a second circulation fan 35, a second gas heater 34, a drying room cooling exhaust fan 2, and a drying room cooling intake valve 9; a drying room bottom gas channel 32 is arranged at a position close to the bottom in the drying room 3, a drying room top gas channel 4 is arranged at a position close to the top, and the drying room cooling exhaust fan 2 and the drying room cooling air inlet valve 9 are both fixed on the drying room 3 and are communicated with the inside of the drying room 3; the air outlet end of the second circulating fan 35 is connected with the air inlet end of the second air heater 34, the air outlet end of the second air heater 34 is connected with the drying room bottom air channel 32, and the air inlet end of the second circulating fan 35 is connected with the drying room top air channel 4; the second circulating fan 35, the second gas heater 34, the drying room cooling exhaust fan 2 and the drying room cooling air inlet valve 9 are all in communication connection with the control system 18 and are driven to be switched by the control system 18; the gas delivered by the second circulating fan 35 is dry air, and the second gas heater 34 preferentially uses natural gas energy for heating.
In the process of circularly heating the external container 5, the drying room cooling exhaust fan 2 and the drying room cooling air inlet valve 9 are closed, the second circulating fan 35 and the second air heater 34 are opened, the second circulating fan 35 absorbs air in the drying room 3, the air is heated and then input into the drying room 3 again, the external container 5 in the drying room 3 is heated, the air in the drying room 3 is circularly utilized, the residual temperature of the air is fully utilized, and the energy consumption of the second air heater 34 is reduced; when the outer container 5 is cooled, the drying room cooling exhaust fan 2 and the drying room cooling air inlet valve 9 are opened, the second circulating fan 35 and the second gas heater 34 are closed, the drying room cooling air inlet valve 9 continuously inputs normal-temperature air to the drying room 3 from the outside of the drying room, and the drying room cooling exhaust fan 2 pumps out original hot air in the drying room 3.
Referring to fig. 1 and 3, the outer container heating and cooling cycle system further comprises a drying chamber inlet air temperature sensor 33, a drying chamber outlet air temperature sensor 1 and a drying chamber temperature sensor 36; the drying room inlet air temperature sensor 33 is connected between the second air heater 34 and the drying room bottom air channel 32 and is used for detecting the temperature of air input into the drying room; the drying room air outlet temperature sensor 1 is connected between the second circulating fan 35 and the drying room top gas channel 4 and is used for detecting the temperature of air output by the drying room 3; the drying room temperature sensor 36 is arranged inside the drying room and used for detecting the temperature inside the drying room 3, the drying room air inlet temperature sensor 33, the drying room air outlet temperature sensor 1 and the drying room temperature sensor 36 are all in communication connection with the control system 18 and all transmit the detected temperature to the control system 18 for displaying, and the control system 18 switches the second air heater 34 according to the detected temperature.
Referring to fig. 1 and 4, a high vacuum flapper valve 20, an integrated measuring chamber 22 and an interlayer evacuation valve 30 are sequentially connected between a vacuum pumping unit 21 and an interlayer, the integrated measuring chamber is provided with a balance valve 25 and a vacuum sensor 28, the vacuum sensor 28 is used for detecting the vacuum degree in the interlayer, the balance valve 25 is used for adjusting the relative balance of pressures at two sides, the high vacuum flapper valve 20, the interlayer evacuation valve 30, the balance valve 25 and the vacuum sensor 28 are all in communication connection with a control system 18, the vacuum sensor 28 transmits a detection value to the control system 18, and the control system 18 opens or closes the high vacuum flapper valve 20 and the interlayer evacuation valve 30 according to the detection value.
Referring to fig. 1 and 4, the micro-positive pressure nitrogen flushing and displacing system comprises a nitrogen source 29, a third gas heater 26, a pressure sensor 19 and an automatic air outlet control valve 37; the gas inlet end of the third gas heater 26 is connected with a nitrogen source 29, the gas outlet end of the third gas heater 26 is connected to the integrated measuring chamber 22, an interlayer gas inlet control valve 23 is connected between the third gas heater 26 and the integrated measuring chamber 22 and used for controlling the input of hot nitrogen into the interlayer, the automatic gas outlet control valve 38 is connected to the opening of the outer container interlayer explosion-proof device through a pipeline, the pressure sensor 19 is connected to the integrated measuring chamber 22 and used for detecting the gas pressure in the interlayer, when the gas pressure in the interlayer detected by the pressure sensor 19 reaches a set value in the replacement process, the automatic gas outlet control valve 38 is opened while the nitrogen is continuously filled into the interlayer, the nitrogen is discharged and the interlayer gas pressure is kept, so that the nitrogen flows in the interlayer, and the replacement effect is further increased; the third gas heater 26, the interlayer gas inlet control valve 23 and the automatic gas outlet control valve 37 are all in communication connection with the control system 18 and are controlled to be opened and closed by the control system 18; the third gas heater 26 may be heated using natural gas energy or electrical energy.
Referring to fig. 1 and 4, the micro-positive pressure nitrogen flushing and replacing system further comprises a nitrogen pressure sensor 27 for detecting the input pressure of nitrogen, an interlayer inlet air temperature sensor 24 for detecting the temperature of the input nitrogen, an interlayer outlet air temperature sensor 38 for detecting the temperature of the nitrogen output from the interlayer, and an interlayer vacuum gauge 31 for detecting the degree of vacuum of the interlayer; the nitrogen pressure sensor 27 is connected between a nitrogen source 29 and the third gas heater 26, the interlayer air inlet temperature sensor 24 is connected between the third gas heater 26 and the integrated measuring chamber 22, the interlayer air outlet temperature sensor 38 is connected between an interlayer and an automatic air outlet control valve 37, and the interlayer vacuum gauge pipe 31 is connected with the interlayer; the nitrogen pressure sensor 27, the interlayer air inlet temperature sensor 24, the interlayer vacuum gauge pipe 31 and the interlayer air outlet temperature sensor 38 are all in communication connection with the control system 18, and detected results are all transmitted to the control system 18 and displayed.
Referring to fig. 1, a method for evacuating a vacuum obtaining system using the above vacuum multi-layer heat-insulating cryogenic container sandwich, comprising the steps of:
s1, placing a vacuum multilayer heat insulation low-temperature container in a drying room 3, and circularly heating the inner container by adopting an inner container heating and cooling circulating system, which specifically comprises the following steps: setting an upper limit value of the heating temperature of the inner container (the upper limit value of the heating temperature of the inner container can be 100-200 ℃) and a lower limit value of the heating temperature of the inner container (the lower limit value of the heating temperature of the inner container is 100 ℃), opening an air inlet valve 11 of the inner container and an air outlet valve 14 of the inner container, opening a first gas heater 13 and a first circulating fan 17, heating the output gas of the first circulating fan 17 in the first gas heater 13, controlling the gas temperature to be 100-300 ℃, filling the gas into the inner container 7 through an air inlet of the inner container 7 to heat the inner container 7, then discharging the gas from an air outlet of the inner container 7, and entering the first circulating fan 17 and the first gas heater 13 to circularly heat the inner container 7; when the temperature displayed by the inner container air outlet temperature sensor 10 reaches the upper limit value of the heating temperature of the inner container, the first gas heater 13 stops heating; when the inner container outlet gas temperature sensor 10 indicates a temperature below the lower inner container heating temperature limit, the first gas heater 13 starts heating so that the temperature of the gas discharged from the inner container 7 is maintained between the lower inner container heating temperature limit and the upper inner container heating temperature limit.
S2, the outer container is heated circularly by adopting an outer container heating and cooling circulating system, and the method specifically comprises the following steps: the upper limit value of the heating temperature of the outer container (the upper limit value of the heating temperature of the outer container can be a certain value between 100 ℃ and 180 ℃) and the lower limit value of the heating temperature of the outer container (the lower limit value of the heating temperature of the outer container is 100 ℃) are set by a control system, the second gas heater 34 and the second circulating fan 35 are opened, the gas output by the second circulating fan 35 is heated in the second gas heater 34, wherein the temperature of the air is controlled between 100 ℃ and 250 ℃, then the air is filled into the air channel 32 at the bottom of the drying room, and starts to be exhausted through the drying room bottom air passage 32, hot air enters the inside of the drying room 3 to heat the outer container 5, then enters the air channel 4 at the top of the drying room through an air outlet window arranged on the air channel 4 at the top of the drying room, the waste air is exhausted from an exhaust port of the drying room 3 and enters a second circulating fan 34 and a second air heater 34, so that the outer container 5 is circularly heated; when the temperature of the drying room temperature sensor 36 reaches the upper limit value of the heating temperature of the outer container, the second gas heater 34 stops heating; when the temperature sensor 36 indicates a temperature lower than the lower limit of the heating temperature of the outer container, the second gas heater 34 starts heating so that the temperature of the gas in the drying chamber 3 is maintained between the lower limit of the heating temperature of the outer container and the upper limit of the heating temperature of the outer container.
S3, setting a first vacuum degree threshold value (the value range of the first vacuum degree threshold value is 10-300 Pa) of the interlayer by using a control system, when the temperature of the gas discharged by the inner container heating and cooling circulation system reaches the lower limit value of the heating temperature of the inner container, starting the vacuum-pumping unit 21, opening the high vacuum flapper valve 20 and the interlayer evacuation valve 30, and evacuating the interlayer, closing the high-vacuum flapper valve 20 when the vacuum sensor 28 on the integrated measuring chamber 22 shows that the vacuum degree reaches a set first vacuum degree threshold value, stopping the evacuation unit 21 from evacuating the interlayer, wherein during the evacuation process, the temperature of the inner container is controlled between the lower limit value of the heating temperature of the inner container and the upper limit value of the heating temperature of the inner container by adopting an inner container heating and cooling circulating system, and the temperature of the peripheral gas of the outer container is controlled between the lower limit value of the heating temperature of the outer container and the upper limit value of the heating temperature of the outer container by adopting an outer container heating and cooling circulating system.
S4, after the vacuum degree of the interlayer reaches a first vacuum degree threshold value, adopting a micro-positive pressure nitrogen flushing displacement system to displace gas in the interlayer, wherein the interlayer pressure is controlled to be 110 KPa-130 KPa in the displacement process, and specifically: opening an air supply valve of a nitrogen source 29 and a third air heater 26, outputting nitrogen from the nitrogen source 29 for heating, wherein the interlayer air inlet temperature sensor 24 displays the temperature of the nitrogen, and controlling the temperature of the nitrogen to be 120-250 ℃; opening an interlayer air inlet control valve 23, and filling hot nitrogen into the interlayer through an integrated measuring chamber 22; when the pressure sensor 19 arranged in the integrated measuring chamber 22 displays that the pressure is more than or equal to 0.1MPa, the automatic air outlet control valve 37 is opened to release the nitrogen in the interlayer, air outlet is continued for a preset time period, the time period can be 1-12 h, the air outlet temperature of the nitrogen is displayed in the air outlet temperature sensor 38, and the air outlet temperature of the nitrogen is controlled between 100 ℃ and 180 ℃; the pressure of the nitrogen source is controlled to be less than or equal to 0.2MPa when the pressure of the nitrogen pressure sensor 27 is displayed;
s5, setting a vacuum degree threshold value of the integrated measuring chamber, closing the micro-positive pressure nitrogen flushing and replacing system, namely closing the automatic air outlet control valve 37 and the interlayer air inlet control valve 23, stopping the air supply valve of the third gas heater 26 and the nitrogen source 29, starting the vacuumizing machine set again to evacuate the interlayer until the vacuum sensor 28 on the integrated measuring chamber 22 displays that the vacuum degree is smaller than the set vacuum degree threshold value of the integrated measuring chamber.
S6, setting a second vacuum degree threshold value (the second vacuum degree threshold value is set to be 10Pa) of the interlayer by using a control system, repeating S4 and S5 for a plurality of times until the vacuum degree of the interlayer is smaller than a second final vacuum degree threshold value, finishing the nitrogen replacement of the interlayer, in the process, synchronously and circularly heating the inner container 7 and the outer container 5, enabling gas heat to efficiently penetrate through the heat insulating layer 6, enabling moisture adsorbed by the heat insulating layer 6 to be gasified, vacuumizing the interlayer to cause the vacuum interlayer space to form negative pressure compared with the heat insulating layer, promoting water vapor to be wrapped by non-condensable gas to permeate into the interlayer space, continuously wrapping by micro-pressure hot nitrogen to be carried out of the interlayer space, and repeating the operation for a plurality of times to completely replace the moisture and the non-condensable gas adsorbed by the interlayer.
And S7, stopping the heating and cooling circulation system of the outer container and the vacuumizing unit, and filling the adsorbent into the interlayer.
And S8, starting the outer container heating and cooling circulation system again to circularly heat the outer container.
And S9, setting a third vacuum degree threshold value (the third vacuum degree threshold value is set to be 5Pa) of the interlayer by adopting the control system, starting the vacuumizing unit again to continuously evacuate the interlayer until the vacuum degree is lower than the third vacuum degree threshold value, namely the vacuum degree meets a process set value.
S10, after the preset vacuum degree is reached, the inner container is cooled through the inner container heating and cooling circulation system, namely the first gas heater 13 is closed, the inner container cooling exhaust valve 12 is opened, the inner container cooling air inlet 16 is opened, the inner container air outlet valve 14 is closed, so that the air inlet of the first circulation fan 17 is clean room-temperature air passing through the filter 15, the room-temperature air is filled into the inner container 7 through the air inlet of the inner container 7 to cool the inner container 7, and then the room-temperature air is discharged through the inner container cooling exhaust valve 12.
S11, the outer container is cooled by the outer container heating and cooling circulating system, namely the second circulating fan 35 and the second gas heater 34 are stopped, the drying room cooling exhaust fan 2 and the drying room cooling air inlet valve 9 are opened, the outer container is started to be cooled forcibly until the temperature displayed by the drying room temperature sensor 36 reaches the set temperature, the drying room cooling exhaust fan 2 and the drying room cooling air inlet valve 9 are closed, the door and the access door of the drying room 3 are opened, and the outer container 5 is cooled to the normal temperature.
And S12, stopping the vacuumizing unit when the temperature of the inner container and the temperature of the air around the outer container return to normal temperature.
By adopting the method and the system, the interlayer material of the vacuum multi-layer heat-insulating container, which comprises the heat-insulating material, the outer surface of the inner container and the inner surface of the outer container, can completely desorb and replace the water and the non-condensable gas adsorbed by the heat-insulating material, the high-purity nitrogen gas is remained in the interlayer, and the nitrogen gas can be easily pumped out, so that after the interlayer is pumped out and sealed in vacuum, few gas molecules are continuously released by the interlayer material, and the durable vacuum life of the interlayer can be obtained. If reasonable adsorbent is used at the same time, the vacuum service life of the vacuum multi-layer heat-insulation low-temperature container interlayer can reach more than 10 years, and is improved by more than 200 percent compared with the vacuum service life of the conventional container interlayer; by adopting the method and the system, the interlayer vacuum obtaining time of the vacuum multilayer heat-insulating container can be shortened to 3-6 days, the manufacturing period of a high-vacuum multilayer heat-insulating storage tank, a tank box and a tank car is shortened, and the manufacturing cost is reduced.
Effect example 1
From 2002 to 2019, a company in Lanzhou paired 36 20m stations3～32m3A novel submarine is implemented by using a low-temperature container. The effective volume of the interlayer of the vacuum multi-layer heat-insulation low-temperature container is 6-8 m3(ii) a The vacuum degree of the interlayer sealing is 1.5 multiplied by 10-4Pa～3.3×10-3Pa, the realized interlayer low-temperature pressure is 6 multiplied by 10-5Pa～3×10-4Pa. After 4-14 years, the low-temperature pressure of the interlayer is repeatedly measured without obvious change, as shown in figure 5.
Effect example 2
Evacuation effect demonstration was carried out in southern Tong company in 11 months in 2017: 1 LNG container of 40 feet and vacuum interlayer effective space of 8.5m3The effective evacuation time is 6 days, and the vacuum degree of the sealing is 3.1E-3Pa when the evacuation is finished, which is shown in Table 1; after liquid nitrogen is added for thermal equilibrium, the cold state vacuum degree is 1.8E-4Pa, which is shown in Table 2; after 2 years, both parties perform interlayer vacuum degree tracking test in 2019 and 10 months, and the data are shown in table 3; the data indicate a 2 year drop in interlayer vacuum of 2E-4Pa, and interlayer vacuum can be expected to remain on the order of E-3 after 20 years.
Table 1: seal vacuum degree test meter
Table 2: initial cold state vacuum degree test meter
Table 3: cold state vacuum degree test meter after 2 years
Effect example 3
No-Sn company, 1 LNG tank with 40 feet and vacuum interlayer effective space of 8.5m, implemented 2 months in 20193. The total time of effective replacement and evacuation is 6 days, the air outlet temperature of the inner tank is 52 ℃ when the inner tank is sealed, and the interlayer vacuum degree is 9.5 multiplied by 10-4Pa (directly measured by being arranged on a sandwich gauge pipe), the existing national standard NB/T47059-2017 requires that the sealing vacuum degree index of the products of the same type is 8 multiplied by 10 at the room temperature-2Pa, excellent sealing data, and is in no way exclusive in the industry.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (8)
1. A vacuum obtaining system for interlayer of vacuum multilayer heat insulation low-temperature container, the vacuum multilayer heat insulation low-temperature container comprises an outer container and an inner container arranged in the outer container, and the interlayer is arranged between the outer container and the inner container, and the vacuum obtaining system is characterized in that: the vacuum obtaining system includes:
the inner container heating and cooling circulating system is connected with the inner container and is used for circularly heating or cooling the inner container;
the outer container heating and cooling circulating system is used for circularly heating or cooling the outer container;
the micro-positive pressure nitrogen flushing and replacing system is connected with the interlayer and is used for replacing gas in the interlayer;
the vacuumizing unit is connected with the interlayer and is used for vacuumizing the interlayer;
and the control system is used for controlling the inner container heating and cooling circulating system, the outer container heating and cooling circulating system, the micro-positive pressure nitrogen flushing and replacing system and the vacuumizing unit.
2. The vacuum gain system for a vacuum multilayer insulating cryogenic container sandwich of claim 1 wherein: the inner container heating and cooling circulation system comprises a first circulating fan, a first gas heater and an inner container cooling air inlet valve, wherein an air outlet end of the first circulating fan is connected with an air inlet end of the first gas heater, the air outlet end of the first gas heater and the air inlet end of the first circulating fan are both connected with an inner container of the vacuum multilayer heat-insulation low-temperature container, an inner container cooling exhaust valve is also connected with the air inlet end of the first circulating fan, an inner container air inlet valve is further connected between the first gas heater and the inner container, an inner container cooling exhaust valve and an inner container air outlet valve are further sequentially connected between the first circulating fan and the inner container, and the inner container cooling air inlet valve is matched with a filter; the first circulating fan, the first gas heater, the inner container air inlet valve, the cooling exhaust valve, the inner container air outlet valve and the inner container cooling air inlet valve are all in communication connection with the control system.
3. The vacuum gain system for a vacuum multilayer insulating cryogenic container sandwich of claim 2 wherein: the inner container heating and cooling circulation system further comprises an inner container air inlet temperature sensor and an inner container air outlet temperature sensor, the inner container air inlet temperature sensor is connected between an inner container air inlet valve and the inner container, the inner container air outlet temperature sensor is connected between the inner container and an inner container cooling exhaust valve, and the inner container air inlet temperature sensor and the inner container air outlet temperature sensor are both in communication connection with the control system.
4. The vacuum gain system for a vacuum multilayer insulating cryogenic container sandwich of claim 1 wherein: the outer container heating and cooling circulating system comprises a drying room, a second circulating fan, a second gas heater, a drying room cooling exhaust fan and a drying room cooling air inlet valve; a drying room bottom gas channel is arranged at a position close to the bottom in the drying room, a drying room top gas channel is arranged at a position close to the top, and the drying room cooling exhaust fan and the drying room cooling air inlet valve are both fixed on the drying room and communicated with the inside of the drying room; the air outlet end of the second circulating fan is connected with the air inlet end of the second air heater, the air outlet end of the second air heater is connected with the air channel at the bottom of the drying room, and the air inlet end of the second circulating fan is connected with the air channel at the top of the drying room; and the second circulating fan, the second gas heater, the drying room cooling exhaust fan and the drying room cooling air inlet valve are all in communication connection with the control system.
5. The vacuum gain system for a vacuum multilayer insulating cryogenic container sandwich of claim 4 wherein: the outer container heating and cooling circulating system also comprises a drying room air inlet temperature sensor, a drying room air outlet temperature sensor and a drying room temperature sensor; the drying room air inlet temperature sensor is connected between the second air heater and the drying room bottom air channel, the drying room air outlet temperature sensor is connected between the second circulating fan and the drying room top air channel, and the drying room temperature sensor is arranged in the drying room; the drying room air inlet temperature sensor, the drying room air outlet temperature sensor and the drying room temperature sensor are all in communication connection with the control system.
6. The vacuum gain system for a vacuum multilayer insulating cryogenic container sandwich of claim 1 wherein: the high vacuum baffle valve, the integrated measuring chamber and the interlayer evacuating valve are sequentially connected between the evacuating unit and the interlayer, the integrated measuring chamber is provided with the balance valve and the vacuum sensor, and the high vacuum baffle valve, the interlayer evacuating valve, the balance valve and the vacuum sensor are all in communication connection with the control system.
7. The vacuum gain system for a vacuum multilayer insulating cryogenic container sandwich of claim 6 wherein: the micro-positive pressure nitrogen flushing and replacing system comprises a nitrogen source, a third gas heater, an automatic air outlet control valve and a pressure sensor; the gas inlet end of the third gas heater is connected with a nitrogen source, the gas outlet end of the third gas heater is connected to the integrated measuring chamber, an interlayer gas inlet control valve is connected between the third gas heater and the integrated measuring chamber, the automatic gas outlet control valve is connected to an outer container interlayer explosion-proof device port through a pipeline, and the pressure sensor is connected to the integrated measuring chamber; and the third gas heater, the interlayer gas inlet control valve, the pressure sensor and the automatic gas outlet control valve are in communication connection with the control system.
8. The vacuum gain system for a vacuum multilayer insulating cryogenic container sandwich of claim 7 wherein: the micro-positive pressure nitrogen flushing and replacing system also comprises a nitrogen pressure sensor, an interlayer air inlet temperature sensor, an interlayer air outlet temperature sensor and an interlayer vacuum gauge pipe for detecting the interlayer vacuum degree; the nitrogen pressure sensor is connected between a nitrogen source and the third gas heater, the interlayer air inlet temperature sensor is connected between the third gas heater and the integrated measuring chamber, the interlayer air outlet temperature sensor is connected between the interlayer and the automatic air outlet control valve, and the interlayer vacuum gauge pipe is connected with the interlayer; and the nitrogen pressure sensor, the interlayer air inlet temperature sensor, the interlayer vacuum gauge pipe and the interlayer air outlet temperature sensor are in communication connection with the control system.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111810834A (en) * | 2020-08-05 | 2020-10-23 | 杭州富士达特种材料股份有限公司 | Vacuum obtaining system and method for vacuum multilayer heat insulation low-temperature container interlayer |
| CN114412543A (en) * | 2021-12-29 | 2022-04-29 | 煤炭科学技术研究院有限公司 | Gas control method for first coal seam of close-distance outburst coal seam group |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810834A (en) * | 2020-08-05 | 2020-10-23 | 杭州富士达特种材料股份有限公司 | Vacuum obtaining system and method for vacuum multilayer heat insulation low-temperature container interlayer |
| CN114412543A (en) * | 2021-12-29 | 2022-04-29 | 煤炭科学技术研究院有限公司 | Gas control method for first coal seam of close-distance outburst coal seam group |
| CN114412543B (en) * | 2021-12-29 | 2024-06-07 | 煤炭科学技术研究院有限公司 | Gas control method for first-produced coal seam of close-range outburst coal seam group |
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