CN102797943A - Vacuumizing technology for vacuum low-temperature thermal insulation pipeline - Google Patents
Vacuumizing technology for vacuum low-temperature thermal insulation pipeline Download PDFInfo
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- CN102797943A CN102797943A CN2012103165276A CN201210316527A CN102797943A CN 102797943 A CN102797943 A CN 102797943A CN 2012103165276 A CN2012103165276 A CN 2012103165276A CN 201210316527 A CN201210316527 A CN 201210316527A CN 102797943 A CN102797943 A CN 102797943A
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Abstract
The invention provides vacuumizing technology for a vacuum low-temperature thermal insulation pipeline, which is as follows: when the low-temperature thermal insulation pipeline is vacuumized, nitrogen gas is used for replacing the air in the pipeline so as to reduce moisture and other foreign substances in the vacuum interlayer to the greatest extent, achieve a higher vacuum degree and reduce the cold loss of the low-temperature liquid. The vacuumizing technology for a vacuum low-temperature thermal insulation pipeline satisfies the large-scale production of vacuum low-temperature thermal insulation pipes and the requirements of simultaneously vacuumizing a plurality of vacuum pipes.
Description
Technical field
The present invention designs a kind of vacuum and low temperature insulated piping vacuum pumping technique, relates in particular to a kind of hot nitrogen replacing process that uses and realizes the technology that the vacuum and low temperature insulated piping vacuumizes.
Background technique
Liquefied gas at low temp such as liquid oxygen, liquid nitrogen and LNG Liquefied natural gas are mainly carried through the vacuum and low temperature heat-insulated pipe; The vacuum and low temperature heat-insulated pipe is made up of interior pipe, outer tube and multilayer insulant, and multilayer insulant is for being composited, to reduce radiative heat transfer in the interlayer; And interlayer is pumped into high vacuum state; To reduce heat transfer by convection, isolate with the low thermal conductivity material between the inner and outer pipes, to reduce solid heat transfer; Thereby control to bottom line to interior pipe loss of refrigeration capacity, fully satisfy the isometric distances of cryogenic liquide.Layer vacuum has directly determined the cryogenic property of vacuum and low temperature heat-insulated pipe; It is the key factor that reduces evaporation loss; And the then crucial technology that vacuumizes that depends on of the degree of vacuum of vacuum and low temperature heat-insulated pipe; Reduce the content of moisture and other slag inclusiones etc. of vacuum sandwich to greatest extent, can obtain higher degree of vacuum, reduce the cryogenic liquide refrigerating loss; For satisfying the large-scale production of vacuum and low temperature heat-insulated pipe, the technology that vacuumizes also will satisfy the requirement that can vacuumize several vacuum tubes simultaneously.
In the prior art, when vacuumizing, directly carry out with the high vacuum pump group that connects, the continuous operation through the pump group meets the requirements of degree of vacuum.Because liquid medium is difficult in the adsorption force effect of pump and is thoroughly extracted out down, and basically can be by sucking-off attached to the impurity such as grease of material surface.Therefore, the residual moisture in the interlayer, foreign material such as grease can't extract totally.In use, these materials can gasify or discharge gas, thereby reduce layer vacuum, increase vacuum and low temperature heat-insulated pipe evaporation loss.
Summary of the invention
To the defective that exists in the existing technology technological scheme of the present invention is proposed.The present invention provides a kind of vacuum and low temperature insulated piping vacuum pumping technique.Said technology may further comprise the steps:
Step 1, vacuum tube that will be to be taken out are taken out mouth and are connected with vacuum-pumping pipeline, and vacuum-pumping pipeline is carried out helium leak test until qualified;
Step 2, pipe is inner in treating vacuum-pumping tube inserts a plurality of stainless steel heating sticks, and seal with aluminum foil and adhesive tape at interior pipe two ends, and heating stick is for being connected in parallel, and the employing temperature controlling instrument is controlled said heating stick;
Step 3, in cold-trap, add liquid nitrogen, connect the heating of heating stick power supply, settings heating-up temperature is a preset temperature, and startup vacuum unit continues to vacuumize to the inner and outer pipes interlayer of vacuum tube;
Step 4, when said interlayer temperature reaches preset temperature, interlayer is carried out nitrogen replacement, earlier with the vacuum orifice valve closing, then with the vacuum compressor emergency shutdown; Link to each other heated nitrogen with vacuum line, the nitrogen inlet place is provided with a valve and pressure gauge, opens the valve at nitrogen inlet place, keeps stable numerical value when constant when the pressure gauge numerical value of inlet, closes nitrogen inlet place valve;
Step 5, close inlet's valve and open vacuum pumping pump after 45 minutes, open the vacuum orifice valve and continue to vacuumize, after reaching predetermined vacuum level in the vacuum tube and requiring, stop to vacuumize;
Step 6, every at a distance from 3 hours repeating step three-step 5, nitrogen is always replaced number of times and is no less than 5 times.
Preferably, the heating-up temperature of the heating stick controlled of temperature controlling instrument and preset temperature error are less than 5 degree.
Because the present invention adopted the hot nitrogen substitution method to vacuumize technology, reduced the content of moisture and other slag inclusiones etc. of vacuum sandwich to greatest extent, obtained higher degree of vacuum, reduce the cryogenic liquide refrigerating loss.Satisfy the large-scale production of vacuum and low temperature heat-insulated pipe, the technology that vacuumizes can satisfy the requirement that simultaneously several vacuum tubes is vacuumized.
Embodiment
Below in conjunction with the present invention's one instantiation, the present invention is explained in more detail.
A kind of vacuum and low temperature insulated piping vacuum pumping technique.Said technology may further comprise the steps:
Step 1, vacuum tube that will be to be taken out are taken out mouth and are connected with vacuum-pumping pipeline, and vacuum-pumping pipeline is carried out helium leak test until qualified;
Step 2, pipe is inner in treating vacuum-pumping tube inserts a plurality of stainless steel heating sticks, and seal with aluminum foil and adhesive tape at interior pipe two ends, and heating stick is for being connected in parallel, and the employing temperature controlling instrument is controlled said heating stick;
Step 3, in cold-trap, add liquid nitrogen, connect the heating of heating stick power supply, settings heating-up temperature is a preset temperature, starts the vacuum unit inner and outer pipes interlayer of vacuum tube is continued to vacuumize, and wherein the difference between heating back true temperature and the preset temperature is no more than 5 and spends;
Step 4, when said interlayer temperature reaches preset temperature, interlayer is carried out nitrogen replacement, earlier with the vacuum orifice valve closing, then with the vacuum compressor emergency shutdown; Link to each other heated nitrogen with vacuum line, the nitrogen inlet place is provided with a valve and pressure gauge, opens the valve at nitrogen inlet place, keeps stable numerical value when constant when the pressure gauge numerical value of inlet, closes nitrogen inlet place valve;
Step 5, close inlet's valve and open vacuum pumping pump after 45 minutes, open the vacuum orifice valve and continue to vacuumize, after reaching predetermined vacuum level in the vacuum tube and requiring, stop to vacuumize;
Step 6, every at a distance from 3 hours repeating step three-step 5, it is 4 times that nitrogen is always replaced number of times.
Above embodiment further specifies of the present invention, and those skilled in the art are that above-mentioned explanation is not limited to protection scope of the present invention with being to be understood that.
Claims (2)
1. vacuum and low temperature insulated piping vacuum pumping technique, said technology may further comprise the steps:
Step 1, vacuum tube that will be to be taken out are taken out mouth and are connected with vacuum-pumping pipeline, and vacuum-pumping pipeline is carried out helium leak test until qualified;
Step 2, pipe is inner in treating vacuum-pumping tube inserts a plurality of stainless steel heating sticks, and seal with aluminum foil and adhesive tape at interior pipe two ends, and heating stick is for being connected in parallel, and the employing temperature controlling instrument is controlled said heating stick;
Step 3, in cold-trap, add liquid nitrogen, connect the heating of heating stick power supply, settings heating-up temperature is a preset temperature, and startup vacuum unit continues to vacuumize to the inner and outer pipes interlayer of vacuum tube;
Step 4, when said interlayer temperature reaches preset temperature, interlayer is carried out nitrogen replacement, earlier with the vacuum orifice valve closing, then with the vacuum compressor emergency shutdown; Link to each other heated nitrogen with vacuum line, the nitrogen inlet place is provided with a valve and pressure gauge, opens the valve at nitrogen inlet place, keeps stable numerical value when constant when the pressure gauge numerical value of inlet, closes nitrogen inlet place valve;
Step 5, close inlet's valve and open vacuum pumping pump after 45 minutes, open the vacuum orifice valve and continue to vacuumize, after reaching predetermined vacuum level in the vacuum tube and requiring, stop to vacuumize;
Step 6, every at a distance from 3 hours repeating step three-step 5, nitrogen is always replaced number of times and is no less than 5 times.
2. vacuum pumping technique according to claim 1, the heating-up temperature and the preset temperature error that it is characterized in that the heating stick that temperature controlling instrument is controlled are less than 5 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210316527.6A CN102797943B (en) | 2012-08-31 | 2012-08-31 | Vacuumizing technology for vacuum low-temperature thermal insulation pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210316527.6A CN102797943B (en) | 2012-08-31 | 2012-08-31 | Vacuumizing technology for vacuum low-temperature thermal insulation pipeline |
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| Publication Number | Publication Date |
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| CN102797943A true CN102797943A (en) | 2012-11-28 |
| CN102797943B CN102797943B (en) | 2015-03-25 |
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| CN201210316527.6A Expired - Fee Related CN102797943B (en) | 2012-08-31 | 2012-08-31 | Vacuumizing technology for vacuum low-temperature thermal insulation pipeline |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047535A (en) * | 2012-12-21 | 2013-04-17 | 山东宏达科技集团有限公司 | Interlayer vacuumizing method for cryogenic vessel and special device thereof |
| CN104358999A (en) * | 2014-11-07 | 2015-02-18 | 宜昌江峡船用机械有限责任公司 | Device and method capable of heating and vacuumizing low-temperature container with pearlife interlayer |
| CN108498163A (en) * | 2018-04-24 | 2018-09-07 | 海杰亚（北京）医疗器械有限公司 | The vacuum interlayer treatment process of fission connection cryoablation needle |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020168496A1 (en) * | 1999-12-28 | 2002-11-14 | Kiyotake Morimoto | Method of deforming vacuum heat insulation material, method of fixing vacuum heat insulation material, refrigeration, cold storage vessel, and heat insulation box body |
| CN1223785C (en) * | 2003-08-17 | 2005-10-19 | 河南中原绿能高科有限责任公司 | Vacuumizing method and device for replacing air in interlayer of liquefied natural gas storage tank |
| CN100554682C (en) * | 2006-02-14 | 2009-10-28 | 中集车辆（集团）有限公司 | Vacuum pumping method and device thereof |
| CN201836016U (en) * | 2010-11-04 | 2011-05-18 | 江苏省特种设备安全监督检验研究院常州分院 | Evacuating device for low-temperature gas bottle interlayer |
-
2012
- 2012-08-31 CN CN201210316527.6A patent/CN102797943B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020168496A1 (en) * | 1999-12-28 | 2002-11-14 | Kiyotake Morimoto | Method of deforming vacuum heat insulation material, method of fixing vacuum heat insulation material, refrigeration, cold storage vessel, and heat insulation box body |
| CN1223785C (en) * | 2003-08-17 | 2005-10-19 | 河南中原绿能高科有限责任公司 | Vacuumizing method and device for replacing air in interlayer of liquefied natural gas storage tank |
| CN100554682C (en) * | 2006-02-14 | 2009-10-28 | 中集车辆（集团）有限公司 | Vacuum pumping method and device thereof |
| CN201836016U (en) * | 2010-11-04 | 2011-05-18 | 江苏省特种设备安全监督检验研究院常州分院 | Evacuating device for low-temperature gas bottle interlayer |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047535A (en) * | 2012-12-21 | 2013-04-17 | 山东宏达科技集团有限公司 | Interlayer vacuumizing method for cryogenic vessel and special device thereof |
| CN104358999A (en) * | 2014-11-07 | 2015-02-18 | 宜昌江峡船用机械有限责任公司 | Device and method capable of heating and vacuumizing low-temperature container with pearlife interlayer |
| CN108498163A (en) * | 2018-04-24 | 2018-09-07 | 海杰亚（北京）医疗器械有限公司 | The vacuum interlayer treatment process of fission connection cryoablation needle |
| CN108498163B (en) * | 2018-04-24 | 2020-07-28 | 海杰亚（北京）医疗器械有限公司 | Vacuum interlayer treatment process for split connection cryoablation needle |
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| Publication number | Publication date |
|---|---|
| CN102797943B (en) | 2015-03-25 |
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Granted publication date: 20150325 Termination date: 20180831 |