CN203116907U - Safe measuring device for vacuum degree of liquefied natural gas storage tank interlayer - Google Patents
Safe measuring device for vacuum degree of liquefied natural gas storage tank interlayer Download PDFInfo
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- CN203116907U CN203116907U CN 201220431153 CN201220431153U CN203116907U CN 203116907 U CN203116907 U CN 203116907U CN 201220431153 CN201220431153 CN 201220431153 CN 201220431153 U CN201220431153 U CN 201220431153U CN 203116907 U CN203116907 U CN 203116907U
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Abstract
A safe measuring device for vacuum degree of a liquefied natural gas storage tank interlayer belongs to the field of detection and vacuum technology. The safe measuring device comprises a first high-vacuum valve, a second high-vacuum valve, a third high-vacuum valve, a metal flexible pipe, a collar, a vacuum gauge pipe, an indicator type vacuum gauge, a low-temperature container, an absorption chamber, adsorbent and getter. The absorption chamber is provided with three stainless steel pipes. One stainless steel pipe is communicated with a measured container; one stainless steel pipe is an injection pipe of the adsorbent; and the other is a vacuum pumping pipe of the absorption chamber. The downmost end of the vacuum pumping pipe in the absorption chamber is provided with a 300-mesh 304 net. The low-temperature container is provided with an exhaust pipe and a liquid injection pipe. According to the safe measuring device provided by the utility model, a spring measuring principle of the indicator type vacuum gauge is sufficiently used. Furthermore a 220V AC power is not required on the user field, thereby eliminating potential safety hazard, preventing great safety accident, and promoting quick development of low-temperature pressurized container checking/detection industry. Remarkable economic benefit and social benefit are obtained.
Description
Technical field
The utility model relates to a kind of vacuum tightness security measurement device, and especially a kind of liquefied natural gas (LNG) (LNG, Liquified Natural Gas) storage tank layer vacuum security measurement device belongs to and detects and the vacuum technique field.
Background technology
Rock gas is as a kind of energy of cleaning, is the fuel that the future world of generally acknowledging generally adopts, and it is obvious with respect to " fossil fuel " economy such as electric power, coal, fuel oils, price steadiness in addition, and the Natural Gas Demand amount climbs up and up in recent years.Analyze according to relevant department, the coming years are along with " enforcement and the extension of West-east Gas, " extra large gas lands ", " gas east, river is sent " engineerings such as " Russia send in gas south ", the demand of China's natural gas will be faster than coal and oil.According to the special ENERGY PLANNING of country, the proportion of rock gases in 2010 in energy aggregate demand constitutes is about 6%, and demand will reach 90,000,000,000 m
3, estimate that the year two thousand twenty demand will reach 2,000 hundred million m
3, eruptive growth will appear in the Natural Gas Demand of following China.Because LNG has unrivaled superiority than compression rock gas (CNG) at aspects such as storage, transportation, nimble property, therefore, LNG begins to be greatly developed in China.Matching used low-temperature pressure container such as LNG tank car, LNG basin, LNG cryogenic insulated cylinder etc. also obtain fast development with it.Because in a single day LNG leaks, its volume expands rapidly, has bigger danger.Therefore, for guaranteeing use safety and the security of operation of low-temperature pressure container, according to State General Administration for Quality Supervision's regulation, must carry out periodic inspection to these containers.Good layer vacuum is the prerequisite that guarantees the good heat-insulating property of low-temperature (low temperature) vessel, in case the vacuum environment of interlayer is destroyed, its heat-insulating property will descend, and then increases the cryogenic liquid rate of evaporation in the container.Thereby vacuum measurement is one of essential items for inspection of low-temperature (low temperature) vessel periodic inspection.But when the low-temperature (low temperature) vessel of LNG is equipped with in check, just in case leak in the interlayer, explosion-protection equipment does not detonate again, when then in the rock gas that bleeds, opening the vacuum meter leak detection, the high temperature filament of vacuum meter might set off an explosion, thereby cause damage to people's lives and properties, and LNG storage tank scene can not directly use the AC power of 220V, need carry out explosion-proof processing.Utilize specific measurement mechanism, in low-temperature pressure container periodic inspection and self check process, eliminated potential safety hazard, thereby avoid taking place serious accident, promote the fast development of low-temperature pressure container inspection cause.
In the prior art, application number is the patent of invention of 03112860.2 " realizing method and the combination unit thereof of the quick extracting of condition of high vacuum degree in the container ", the method that realizes condition of high vacuum degree is to contact with the air-breathing thing of activity under the cavity sealing state that need are vacuumized, but employed air-breathing thing is evaporable air-absorbing agent and nonevaporable getter, the two all needs certain subsidiary condition competence exertion suction-operated, and all there is power supply the air-breathing storehouse of main extracting and inside, the air-breathing storehouse of secondary extracting, have under the situation of rock gas also dangerous; Application number is the utility model patent of 200920129266.0 " a kind of vacuum-degree monitoring device and tank bodies ", can monitor the layer vacuum of low temperature storage tank in real time, but inner pressurd vessel does not leak when considering low temperature storage tank splendid attire danger medium in this cover system, the safety problem that produces when danger medium and the work of thermocouple rule can cause great security incident.
The utility model content
For deficiency and the defective that overcomes prior art, the utility model provides a kind of vacuum tightness security measurement device, be used for the measurement of LNG storage tank layer vacuum, this device comprises first high vacuum valve, metal hose, clip, vacuum gauge, the pointer-type vacuum meter, second high vacuum valve, low-temperature (low temperature) vessel, absorption cavity and the 3rd high vacuum valve, wherein adsorb adsorbent is housed in the cavity, normal temperature side at the absorption cavity is equipped with getter, on the absorption cavity three stainless-steel tubes are arranged, one is communicated with tested container, one is the filler pipe of adsorbent, another root is the vacuum-pumping tube of absorption cavity, and vacuum-pumping tube has 300 orders, 304 nets bottom in the absorption cavity.Metal hose is connected with tested container by first high vacuum valve, one end, and the other end is connected with the straight tube that is communicated with the absorption cavity by clip; Be communicated with on the straight tube that adsorbs cavity vacuum gauge and pointer vacuum meter are housed; Absorption is equipped with the 5A adsorbent of molecular sieve in the cavity, is equipped with at the straight length normal temperature place that is communicated with tested container to contain PdO and Ag
2The getter of O potpourri has aperture at the pipe of placing the getter position; Adsorbent chamber is put in the low-temperature (low temperature) vessel; Three straight tubes on the low-temperature (low temperature) vessel inner barrel on adsorbent chamber, also have two straight tubes, one is the cryogenic liquid filler pipe, and another is the boil-off gas vent pipe;
When at the on-the-spot detection of user LNG storage tank layer vacuum, in order to regulate the height of measurement mechanism, be provided with metal hose with the tested container junction, so that both can combine well; In order to give full play to the adsorption effect of adsorbent and getter, getter is placed on the normal temperature side, and adsorbent cools off with liquid nitrogen.The vacuum-pumping tube of absorption cavity has 300 purposes, 304 nets in the absorption cavity, prevent that adsorbent is extracted in the pipeline in the vacuum.Before this cover system moves to the scene, except the valve that is communicated with tested container is under the closing state, remaining valve all is in open mode, utilize the vacuum unit that the absorption cavity is vacuumized with the pipeline that links to each other, close the 3rd high vacuum valve after having taken out vacuum, add liquid nitrogen then in low-temperature (low temperature) vessel, the degree of depth that adds liquid nitrogen surpasses the height of adsorbent, so that adsorbent can fully cool off.After vacuum tightness security measurement device moves to the user scene, do not need to be equipped with the AC power of 220V, only the vacuum meter display unit needs the internal battery power supply, and voltage is 3V, within the scope of safety.When vacuum tightness security measurement device with after tested container is communicated with, open first high vacuum valve and second high vacuum valve, utilize the absorption cavity that the gas in the pipeline is adsorbed, close second high vacuum valve behind the ready to balance and open the vacuum valve of tested container, after pointer vacuum meter obtains certain vacuum tightness, show that vacuum tightness is intact in the tested container interlayer, can measure the vacuum tightness of tested container this moment with vacuum gauge; After pointer vacuum meter can't obtain certain vacuum tightness, show that vacuum tightness is destroyed in the tested container interlayer, can not open the vacuum tightness that vacuum gauge is measured tested container this moment, need carry out further maintenance process to tested container.
The utility model vacuum tightness security measurement device has taken full advantage of the measurements of springs principle of pointer vacuum meter, and in the on-the-spot AC power of using this device not need to be equipped with 220V of user, eliminated potential safety hazard, avoid taking place serious accident, promote the fast development of low-temperature pressure container inspection cause, have remarkable economic efficiency and social benefit.In addition, adopt the 5A molecular sieve and contain PdO and Ag
2The potpourri of O is as adsorbent and getter, and getter is placed on the normal temperature side, without any need for subsidiary condition adsorbent and getter just can bring into play its suction-operated, the vacuum tightness in the pipeline after having guaranteed measurement mechanism and tested container being connected.
Description of drawings
Fig. 1 is the structure principle chart of the utility model LNG storage tank layer vacuum security measurement device.
Among the figure, 1 is first high vacuum valve, the 2nd, metal hose, the 3rd, and clip, the 4th, vacuum gauge, the 5th, pointer vacuum meter, 6 are second high vacuum valves, the 7th, getter, the 8th, the gas outlet of low-temperature (low temperature) vessel, the 9th, the filler pipe of adsorbent, the 10th, low-temperature (low temperature) vessel, the 11st, adsorbent, the 12nd, absorption cavity, the 13rd, the liquid filling pipe, 14 of low-temperature (low temperature) vessel is 300 orders, 304 nets, the 15th, the vacuum-pumping tube and 16 of absorption cavity is the 3rd high vacuum valve.
Embodiment:
Below in conjunction with accompanying drawing concrete enforcement of the present utility model is further described.
As shown in Figure 1, the utility model vacuum tightness security measurement device comprises: first high vacuum valve 1, metal hose 2, clip 3, vacuum gauge 4, pointer vacuum meter 5, the second high vacuum valves 6, low-temperature (low temperature) vessel 10, absorption cavity 12 and the 3rd high vacuum valve 16.Wherein adsorb adsorbent 11 is housed in the cavity 12, in the normal temperature side of adsorbing cavity 12 getter 7 is housed; Absorption has three stainless-steel tubes on the cavity 12, and one is communicated with tested container, and one be the filler pipe 9 of adsorbent 11, and another root is the vacuum-pumping tube 15 that adsorbs cavity 12, and vacuum-pumping tube 15 has 300 orders, 304 nets 14 bottom in adsorbing cavity 12; Gas outlet 8 and liquid filling pipe 13 are arranged on the low-temperature (low temperature) vessel 10.
In order to regulate vacuum tightness security measurement height of devices, be provided with one section metal hose 2 with the tested container junction, metal hose 2 one ends are connected by the straight tube of clip 3 with absorption cavity 12, the other end is connected with tested container by first high vacuum valve 1, and the setting of metal hose 2 can make measurement mechanism and tested container combine well.The vacuum-pumping tube 15 of absorption cavity 12 has 300 purposes, 304 nets 14 bottom, prevents that adsorbent 11 is extracted in the pipeline in the vacuum.Before vacuum tightness security measurement device moves to the scene, need carry out following preliminary work: earlier to absorption cavity 12 interior filling getter 7 and adsorbents 11; Then utilize the vacuum unit that absorption cavity 12 is vacuumized, before starting the vacuum unit, first high vacuum valve 1 that will be communicated with tested container is closed, and second high vacuum valve 6 and the 3rd high vacuum valve 16 are opened, and closes the 3rd high vacuum valve 16 after having taken out vacuum; Add liquid nitrogen by liquid filling pipe 13 in low-temperature (low temperature) vessel 10 then, the degree of depth that adds liquid nitrogen surpasses the height of adsorbent, so that adsorbent can fully cool off.After vacuum tightness security measurement device moves to the user scene, do not need to be equipped with the power supply of 220V, only the vacuum meter display unit needs the internal battery power supply, and voltage is 3V, within the scope of safety.When vacuum tightness security measurement device with after tested container is connected, open first high vacuum valve 1, this moment, second high vacuum valve 6 was in open mode, utilize the gas in 12 pairs of pipelines of absorption cavity to adsorb, treat the vacuum valve of closing second high vacuum valve 6 behind the vacustat and opening tested container, following both situations appear: 1) after pointer vacuum meter 5 obtains certain vacuum tightness, show that vacuum tightness is intact in the tested container interlayer, can measure the vacuum tightness of tested container this moment with vacuum gauge 4; 2) after pointer vacuum meter 5 can't obtain certain vacuum tightness, show that vacuum tightness is destroyed in the tested container interlayer, can not open the vacuum tightness that vacuum gauge 4 is measured tested container this moment, need carry out further maintenance process to tested container.
Claims (2)
1. LNG tank layer vacuum security measurement device, comprise first high vacuum valve (1), metal hose (2), clip (3), vacuum gauge (4), pointer-type vacuum meter (5), second high vacuum valve (6), low-temperature (low temperature) vessel (10), absorption cavity (12) and the 3rd high vacuum valve (16), it is characterized in that adsorbing adsorbent (11) is housed in the cavity (12), in the normal temperature side of adsorbing cavity (12) getter (7) is housed, on the absorption cavity (12) three stainless-steel tubes are arranged, one is communicated with tested container, one is the filler pipe (9) of adsorbent (11), and another root is the vacuum-pumping tube (15) of absorption cavity (12), and vacuum-pumping tube (15) has 300 orders, 304 nets (14) bottom in absorption cavity (12).
2. LNG tank layer vacuum security measurement device according to claim 1 is characterized in that gas outlet (8) and liquid filling pipe (13) are arranged on the described low-temperature (low temperature) vessel (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220431153 CN203116907U (en) | 2012-08-28 | 2012-08-28 | Safe measuring device for vacuum degree of liquefied natural gas storage tank interlayer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220431153 CN203116907U (en) | 2012-08-28 | 2012-08-28 | Safe measuring device for vacuum degree of liquefied natural gas storage tank interlayer |
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| CN203116907U true CN203116907U (en) | 2013-08-07 |
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| CN 201220431153 Expired - Fee Related CN203116907U (en) | 2012-08-28 | 2012-08-28 | Safe measuring device for vacuum degree of liquefied natural gas storage tank interlayer |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116865A (en) * | 2015-09-09 | 2015-12-02 | 江苏德邦工程有限公司 | LNG (liquefied natural gas) filling station optimization control system |
| RU175121U1 (en) * | 2016-06-08 | 2017-11-21 | Юлия Александровна Солдатова | PRIMARY CONVERTER OF A PIEZER RESONANT VISCOUS VACUUM METER |
| CN110646133A (en) * | 2018-06-27 | 2020-01-03 | 张家港中集圣达因低温装备有限公司 | Vacuum degree on-line monitoring system of vacuum container |
| CN110987291A (en) * | 2019-10-23 | 2020-04-10 | 张家港富瑞特种装备股份有限公司 | Method for measuring and calculating relationship between vacuum degree of low-temperature gas cylinder and daily evaporation rate and adsorption capacity |
| CN111222796A (en) * | 2020-01-09 | 2020-06-02 | 西安交通大学 | Method and device for measuring vacuum degree of LNG pipeline based on temperature field principle, storage medium and terminal equipment |
| CN112284651A (en) * | 2020-09-29 | 2021-01-29 | 张家港富瑞深冷科技有限公司 | Method for detecting interlayer vacuum degree of low-temperature storage tank |
| CN113044238A (en) * | 2019-12-26 | 2021-06-29 | 中国航空工业集团公司西安飞机设计研究所 | Design method of vacuumizing pipeline of aircraft fuel test bed |
-
2012
- 2012-08-28 CN CN 201220431153 patent/CN203116907U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116865A (en) * | 2015-09-09 | 2015-12-02 | 江苏德邦工程有限公司 | LNG (liquefied natural gas) filling station optimization control system |
| RU175121U1 (en) * | 2016-06-08 | 2017-11-21 | Юлия Александровна Солдатова | PRIMARY CONVERTER OF A PIEZER RESONANT VISCOUS VACUUM METER |
| CN110646133A (en) * | 2018-06-27 | 2020-01-03 | 张家港中集圣达因低温装备有限公司 | Vacuum degree on-line monitoring system of vacuum container |
| CN110987291A (en) * | 2019-10-23 | 2020-04-10 | 张家港富瑞特种装备股份有限公司 | Method for measuring and calculating relationship between vacuum degree of low-temperature gas cylinder and daily evaporation rate and adsorption capacity |
| CN113044238A (en) * | 2019-12-26 | 2021-06-29 | 中国航空工业集团公司西安飞机设计研究所 | Design method of vacuumizing pipeline of aircraft fuel test bed |
| CN111222796A (en) * | 2020-01-09 | 2020-06-02 | 西安交通大学 | Method and device for measuring vacuum degree of LNG pipeline based on temperature field principle, storage medium and terminal equipment |
| CN112284651A (en) * | 2020-09-29 | 2021-01-29 | 张家港富瑞深冷科技有限公司 | Method for detecting interlayer vacuum degree of low-temperature storage tank |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Chen Shujun Document name: Notification of Termination of Patent Right |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130807 Termination date: 20150828 |