CN104456063A - Fast vacuum pumping system and method for cryogenic insulation pressure vessels - Google Patents
Fast vacuum pumping system and method for cryogenic insulation pressure vessels Download PDFInfo
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- CN104456063A CN104456063A CN201410707608.8A CN201410707608A CN104456063A CN 104456063 A CN104456063 A CN 104456063A CN 201410707608 A CN201410707608 A CN 201410707608A CN 104456063 A CN104456063 A CN 104456063A
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- molecular sieve
- liquid nitrogen
- storage tank
- nitrogen storage
- vacuum pumping
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Abstract
The invention discloses a fast vacuum pumping system and method for cryogenic insulation pressure vessels. The pressure vessels are connected in parallel sequentially to a vacuum pumping main pipeline through corresponding vacuum pumping branch pipelines, and molecular sieve vacuum pumping units are connected in parallel to the vacuum pumping main pipeline; and each molecular sieve vacuum pumping unit comprises a casing, a liquid nitrogen storage tank and a regeneration electric furnace, the liquid nitrogen storage tank is nested in the casing and integrally connected with the casing, a molecular sieve chamber is formed in space between the casing and the liquid nitrogen storage tank and filled with molecular sieves, the molecular sieve chamber is communicated with the vacuum pumping main pipeline, a plurality of heat conduction fins are arranged on the outer wall of the liquid nitrogen storage tank, a liquid nitrogen inlet and an electric furnace insert port are formed in the liquid nitrogen storage tank, and the regeneration electric furnace is matched with the electric furnace insert port for use. According to the fast vacuum pumping system and method, oil pollution is avoided, and the vacuum pumping efficiency can be increased effectively; the vacuum pumping time is shortened, energy consumption is reduced, and investment of manpower and material resources is reduced.
Description
Technical field
The present invention relates to a kind of interlayer vacuum-pumping technology of low-temperature heat-insulation pressure container, in particular a kind of rapid vacuumizing system and method for low-temperature heat-insulation pressure container.
Background technique
Low-temperature heat-insulation pressure container, is mainly used in storing and transporting the low-temperature deep liquid such as liquid oxygen, liquid nitrogen, liquid argon, liquid carbon dioxide and LNG Liquefied natural gas (LNG).Low-temperature heat-insulation pressure container forms primarily of inner bag, shell and valve accessories system.Inner bag is used for storing cryogenic liquide, and shell provides protection and supports; Form the interlayer of container between the inner bag of container and shell, sandwich design is high vacuum multiple layer heat insulation structure, needs to be pumped into vacuum, and General Requirements degree of vacuum is not less than 1.0x10
-2pa, to go into good thermal insulation property, reduces gas discharging.Degree of vacuum is higher, and effect is better.
At present, the vacuum pumping technology of industrial field is generally divided into two steps: the first step, for slightly to take out, by being filled with in vacuum sandwich by the gas medium after heating, replaces inner air, comparatively ripe is adopt carbon dioxide or nitrogen to replace, as Chinese invention patent 03162769.8; Second step is pumping high vacuum, adopts the conventional vacuum pump such as Roots pump, diffusion pump or molecular pump to carry out reaching tens days finding time continuously, makes interlayer reach high vacuum state.
Existing vacuum pumping method has the following disadvantages: 1, above-mentioned conventional vacuum pump adopts pumping fluid to carry out work due to needs, easily causes the oil pollution of vacuum sandwich, and impact vacuumizes efficiency and vacuum life; 2, the pumpdown time is long, and vacuum pump will be extracted into the required value of adiabatic pressure container, will run about 10 days continuously, if will reach higher degree of vacuum as 3.0x10
-4pa, needs to run 15 ~ 20 days continuously, not only consuming time, affects manufacturing efficiency, but also will arrange personnel's timing monitoring, increases cost of production; 3, energy consumption is large.In the first step vacuumized, need gas medium to be heated to more than 200 DEG C, need consumption to get certain electric energy; In the high vacuum extraction process of second step, reach degree of vacuum 2.0x10
-2pa ~ 3.0x10
-4pa, vacuum pump will run 10 ~ 20 day time, not only consumes a large amount of electric energy, affects life of equipment simultaneously.Therefore, existing vacuum pumping technology, not only damages equipment, and time-consuming, and energy consumption is large.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of rapid vacuumizing system and method for low-temperature heat-insulation pressure container, utilize the characteristic of molecular sieve to achieve and vacuumize fast and effectively.
The present invention is achieved by the following technical solutions, the present invention includes multiple pressurized container, multiplely vacuumizes bye-pass, vacuumizes main line, at least one molecular sieve vacuum unit; Described pressurized container is connected in parallel on successively vacuumizes on main line respectively by the bye-pass that vacuumizes of correspondence, and molecular sieve vacuum unit is connected in parallel on successively and vacuumizes on main line; Each molecular sieve vacuum unit comprises shell, liquid nitrogen storage tank and regeneration electric furnace, liquid nitrogen storage tank is in the enclosure sheathed and be connected as a single entity with shell, space between shell and liquid nitrogen storage tank forms molecular sieve chamber, molecular sieve is filled in molecular sieve chamber, described molecular sieve chamber connection vacuumizes main line, the outer wall of liquid nitrogen storage tank is provided with multiple heat conducting fins, liquid nitrogen storage tank is offered liquid nitrogen inlet opening and electric furnace insert port, regeneration electric furnace and circuit insert port with the use of.
As one of effective means of the present invention, described each vacuumizing on bye-pass is respectively equipped with isolating valve.
As one of effective means of the present invention, described in vacuumize bye-pass be corrugated flexible hose.
As one of effective means of the present invention, described in vacuumize between main line and molecular sieve chamber and be provided with flapper valve.
As one of effective means of the present invention, described molecular sieve chamber is provided with regeneration exhaust valve.
As one of effective means of the present invention, described in vacuumize main line and be provided with vacuum measuring instrument.
As one of effective means of the present invention, described heat conducting fins adopts copper, aluminium or stainless steel to make.
As one of effective means of the present invention, described pressurized container comprises housing, vacuum sandwich and inner bag from outside to inside successively, and what described vacuum sandwich connection was corresponding vacuumizes bye-pass.
As one of effective means of the present invention, one or both in 5A molecular sieve or 13X molecular sieve of described molecular screening.
A method for the rapid vacuumizing of low-temperature heat-insulation pressure container, comprises the following steps:
(1) open flapper valve, isolating valve, closedown regeneration exhaust valve successively, in liquid nitrogen storage tank, inject liquid nitrogen;
(2) liquid nitrogen storage tank temperature reduces, and is cooled by molecular sieve by heat conducting fins, and molecular sieve temperature will vacuumize main line, and vacuumize the gas absorption of the vacuum sandwich of bye-pass and pressurized container after reducing, thus realizes vacuumizing;
(3) after degree of vacuum meets product requirement, close isolating valve and flapper valve successively, liquid nitrogen is reclaimed by liquid nitrogen inlet opening;
(4) before second time vacuumizes, open regeneration exhaust valve, with regeneration heating by electric cooker liquid nitrogen storage tank to 200 DEG C ~ 500 DEG C, activating and regenerating is carried out to molecular sieve.
The present invention adopts molecular sieve to vacuumize low-temperature heat-insulation pressure container interlayer, does not need to adopt pumping fluid, effectively can eliminate oil pollution; By the optimal design-aside vacuumized molecular sieve, greatly can shorten pump-down time, and reduction vacuumizes energy consumption.
Molecular sieve, is also artificial zeolite, belongs to the alkali metal aluminosilicate of pore type structure, and its general molecular formula is [XM
2/noAl
2o
3nS
io
2] mH
2o.Have a lot of cavity shape structure cell in body, have window identical between structure cell, gas molecule can be adsorbed in the internal surface of structure cell cavity by fenestra.Molecular sieve has very large specific surface area, and it especially under liquid nitrogen temperature (-196 DEG C), has very strong gettering ability at low temperatures; And in the case of a high temperature, again can by the air release of absorption out.Namely the present invention utilizes the interlayer of this character to low-temperature heat-insulation pressure container of molecular sieve to vacuumize.
The present invention has the following advantages compared to existing technology: the present invention does not need to use vacuum pump, thus eliminates the pollution of oil, effectively can improve and vacuumize efficiency; Without preheating evacuation, not needing the operation of finding time of continuous tens days, successfully can extract the most gases in interlayer out, and degree of vacuum reaches and is better than product technology standard-required, not only shorten the pumpdown time, and reduce energy consumption, decrease the input of manpower and materials.The present invention have find time more thoroughly, degree of vacuum is high, vacuum pumping rate is fast, efficiency is high, saves energy and reduce the cost, the advantages such as emission-free discharge.Adopt molecular sieve as the main material vacuumized, because it is cheap, not only disposable input cost is low simultaneously, and repeats regeneration activating use, effectively reduces cost of production.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present embodiment 1;
Fig. 2 is the structural representation of regeneration electric furnace;
Fig. 3 is the structural representation of embodiment 2.
Embodiment
Elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give detailed mode of execution and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
As depicted in figs. 1 and 2, the present embodiment comprises multiple pressurized container 1, multiplely vacuumizes bye-pass 2, vacuumizes main line 4, molecular sieve vacuum unit 7; Described pressurized container 1 is connected in parallel on successively vacuumizes on main line 4 respectively by the bye-pass 2 that vacuumizes of correspondence, and molecular sieve vacuum unit 7 is connected to and vacuumizes on main line 4; Each molecular sieve vacuum unit 7 comprises shell 71, liquid nitrogen storage tank 72 and regeneration electric furnace 73, liquid nitrogen storage tank 72 to be set in shell 71 and to be connected as a single entity with shell 71, space between shell 71 and liquid nitrogen storage tank 72 forms molecular sieve chamber 74, molecular sieve is filled in molecular sieve chamber 74, described molecular sieve chamber 74 connection vacuumizes main line 4, the outer wall of liquid nitrogen storage tank 72 is provided with multiple heat conducting fins 75, liquid nitrogen storage tank 72 is offered liquid nitrogen inlet opening 76 and electric furnace insert port 77, regeneration electric furnace 73 and circuit insert port with the use of.Pressurized container 1 comprises housing 11, vacuum sandwich 12 and inner bag 13 from outside to inside successively, and described vacuum sandwich 12 is communicated with and corresponding vacuumizes bye-pass 2.
Each vacuumizing on bye-pass 2 is respectively equipped with isolating valve 3, vacuumizing bye-pass 2 and vacuumizing main line 4, being convenient to control separately each low-temperature heat-insulation pressure container 1 for cutting off.Vacuumizing between main line 4 and molecular sieve chamber 74 and be provided with flapper valve 5, vacuumizing main line 4 and molecular sieve chamber 74 for cutting off, realize controlling.Molecular sieve chamber 74 is provided with regeneration exhaust valve 6, for gas discharging during regenerating molecular sieve.Vacuumize main line 4 and be provided with vacuum measuring instrument 8, for judging whether degree of vacuum meets product requirement.
For the ease of connecting, vacuumizing bye-pass 2 is corrugated flexible hose.Heat conducting fins 75 adopts copper, aluminium or stainless steel to make, and is convenient to cooling and the regeneration of molecular sieve.The molecular sieve of the present embodiment is 5A molecular sieve.
The method vacuumized of the present embodiment, comprises the following steps:
(1) open flapper valve 5, isolating valve 3 successively, close regeneration exhaust valve 6, in liquid nitrogen storage tank, inject liquid nitrogen;
(2) liquid nitrogen storage tank temperature reduces, and is cooled by molecular sieve by heat conducting fins 75, and molecular sieve temperature will vacuumize main line 4, and vacuumize the gas absorption of the vacuum sandwich 12 of bye-pass 2 and pressurized container 1 after reducing, thus realizes vacuumizing; Along with the going deep into of cooling effect of molecular sieve, degree of vacuum will be become better and better;
(3) after degree of vacuum meets product requirement, close isolating valve 3 and flapper valve 5 successively, liquid nitrogen is reclaimed by liquid nitrogen inlet opening 76;
(4) before second time vacuumizes, open regeneration exhaust valve 6, heat liquid nitrogen storage tank to 200 DEG C ~ 500 DEG C with regeneration electric furnace 73, activating and regenerating is carried out to molecular sieve.
Embodiment 2
As shown in Figure 3, the molecular sieve vacuum unit 7 of the present embodiment has two, and be connected in parallel on successively and vacuumize on main line 4, other mode of executions are identical with embodiment 1.
The present embodiment work time, first use when finding time wherein one group slightly take out, the Inert gas molecule vacuumized in the vacuum sandwich 12 of main line 4 and pressurized container 1 is shunted, requires that degree of vacuum is not less than 1Pa; Then close first molecular sieve vacuum pumping device, open second molecular sieve vacuum pumping device, vacuumize further.Vacuumized by two-stage, can improve vacuum further, in 10 hours, degree of vacuum can arrive 5x10
-4pa, is better than product technology standard-required greatly.
Claims (10)
1. a rapid vacuumizing system for low-temperature heat-insulation pressure container, is characterized in that, comprises multiple pressurized container, multiplely vacuumizes bye-pass, vacuumizes main line, at least one molecular sieve vacuum unit; Described pressurized container is connected in parallel on successively vacuumizes on main line respectively by the bye-pass that vacuumizes of correspondence, and molecular sieve vacuum unit is connected in parallel on successively and vacuumizes on main line; Each molecular sieve vacuum unit comprises shell, liquid nitrogen storage tank and regeneration electric furnace, liquid nitrogen storage tank is in the enclosure sheathed and be connected as a single entity with shell, space between shell and liquid nitrogen storage tank forms molecular sieve chamber, molecular sieve is filled in molecular sieve chamber, described molecular sieve chamber connection vacuumizes main line, the outer wall of liquid nitrogen storage tank is provided with multiple heat conducting fins, liquid nitrogen storage tank is offered liquid nitrogen inlet opening and electric furnace insert port, regeneration electric furnace and circuit insert port with the use of.
2. the rapid vacuumizing system of a kind of low-temperature heat-insulation pressure container according to claim 1, is characterized in that, described each vacuumizing on bye-pass is respectively equipped with isolating valve.
3. the rapid vacuumizing system of a kind of low-temperature heat-insulation pressure container according to claim 1, is characterized in that, described in vacuumize bye-pass be corrugated flexible hose.
4. the rapid vacuumizing system of a kind of low-temperature heat-insulation pressure container according to claim 1, is characterized in that, described in vacuumize between main line and molecular sieve chamber and be provided with flapper valve.
5. the rapid vacuumizing system of a kind of low-temperature heat-insulation pressure container according to claim 1, is characterized in that, described molecular sieve chamber is provided with regeneration exhaust valve.
6. the rapid vacuumizing system of a kind of low-temperature heat-insulation pressure container according to claim 1, is characterized in that, described in vacuumize main line and be provided with vacuum measuring instrument.
7. the rapid vacuumizing system of a kind of low-temperature heat-insulation pressure container according to claim 1, is characterized in that, described heat conducting fins adopts copper, aluminium or stainless steel to make.
8. the rapid vacuumizing system of a kind of low-temperature heat-insulation pressure container according to claim 1, is characterized in that, described pressurized container comprises housing, vacuum sandwich and inner bag from outside to inside successively, and what described vacuum sandwich connection was corresponding vacuumizes bye-pass.
9. the rapid vacuumizing system of a kind of low-temperature heat-insulation pressure container according to claim 1, is characterized in that, one or both in 5A molecular sieve or 13X molecular sieve of described molecular screening.
10. the method for the rapid vacuumizing of a kind of low-temperature heat-insulation pressure container as described in any one of claim 1 ~ 9, is characterized in that, comprise the following steps:
(1) open flapper valve, isolating valve, closedown regeneration exhaust valve successively, in liquid nitrogen storage tank, inject liquid nitrogen;
(2) liquid nitrogen storage tank temperature reduces, and is cooled by molecular sieve by heat conducting fins, and molecular sieve temperature will vacuumize main line, and vacuumize the gas absorption of the vacuum sandwich of bye-pass and pressurized container after reducing, thus realizes vacuumizing;
(3) after degree of vacuum meets product requirement, close isolating valve and flapper valve successively, liquid nitrogen is reclaimed by liquid nitrogen inlet opening;
(4) before second time vacuumizes, open regeneration exhaust valve, with regeneration heating by electric cooker liquid nitrogen storage tank to 200 DEG C ~ 500 DEG C, activating and regenerating is carried out to molecular sieve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410707608.8A CN104456063A (en) | 2014-11-28 | 2014-11-28 | Fast vacuum pumping system and method for cryogenic insulation pressure vessels |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410707608.8A CN104456063A (en) | 2014-11-28 | 2014-11-28 | Fast vacuum pumping system and method for cryogenic insulation pressure vessels |
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| Publication Number | Publication Date |
|---|---|
| CN104456063A true CN104456063A (en) | 2015-03-25 |
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ID=52902568
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410707608.8A Pending CN104456063A (en) | 2014-11-28 | 2014-11-28 | Fast vacuum pumping system and method for cryogenic insulation pressure vessels |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106287208A (en) * | 2016-09-27 | 2017-01-04 | 北京市燃气集团有限责任公司 | A kind of natural gas scattered gas recoverable ANG of intelligence adsorbs bottle group device |
| CN114910213A (en) * | 2022-04-19 | 2022-08-16 | 广州美东能源有限公司 | Efficient LNG storage tank vacuum degree detection and maintenance method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5043148A (en) * | 1988-02-08 | 1991-08-27 | Mitsubishi Denki Kabushiki Kaisha | Transfer device |
| CN103322403A (en) * | 2013-06-06 | 2013-09-25 | 张家港富瑞特种装备股份有限公司 | Low-temperature gas cylinder vacuuming system |
| CN103822085A (en) * | 2014-03-19 | 2014-05-28 | 北京华诚浩达真空空压设备有限公司 | Liquefied natural gas bottle sandwiching vacuum-pumping system and method with function of circularly heating inner container |
| CN204268059U (en) * | 2014-11-28 | 2015-04-15 | 安徽大盘压力容器有限公司 | A kind of rapid vacuumizing system of low-temperature heat-insulation pressure container |
-
2014
- 2014-11-28 CN CN201410707608.8A patent/CN104456063A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5043148A (en) * | 1988-02-08 | 1991-08-27 | Mitsubishi Denki Kabushiki Kaisha | Transfer device |
| CN103322403A (en) * | 2013-06-06 | 2013-09-25 | 张家港富瑞特种装备股份有限公司 | Low-temperature gas cylinder vacuuming system |
| CN103822085A (en) * | 2014-03-19 | 2014-05-28 | 北京华诚浩达真空空压设备有限公司 | Liquefied natural gas bottle sandwiching vacuum-pumping system and method with function of circularly heating inner container |
| CN204268059U (en) * | 2014-11-28 | 2015-04-15 | 安徽大盘压力容器有限公司 | A kind of rapid vacuumizing system of low-temperature heat-insulation pressure container |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106287208A (en) * | 2016-09-27 | 2017-01-04 | 北京市燃气集团有限责任公司 | A kind of natural gas scattered gas recoverable ANG of intelligence adsorbs bottle group device |
| CN114910213A (en) * | 2022-04-19 | 2022-08-16 | 广州美东能源有限公司 | Efficient LNG storage tank vacuum degree detection and maintenance method |
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Application publication date: 20150325 |
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