CN202860164U - Skid-mounted natural gas reliquefaction device - Google Patents
Skid-mounted natural gas reliquefaction device Download PDFInfo
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- CN202860164U CN202860164U CN201220437793.XU CN201220437793U CN202860164U CN 202860164 U CN202860164 U CN 202860164U CN 201220437793 U CN201220437793 U CN 201220437793U CN 202860164 U CN202860164 U CN 202860164U
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Abstract
The utility model discloses a skid-mounted natural gas reliquefaction device which comprises a low-temperature liquefaction tank, a low-temperature refrigerator and a low-temperature evaporated gas heat exchanger, wherein the low-temperature liquefaction tank is provided with a gas flow-in pipeline and a liquid flow-out pipeline; the gas flow-in pipeline is provided with a safety valve; a cold head of the low-temperature refrigerator is connected with the low-temperature evaporated gas heat exchanger; and the low-temperature evaporation heat exchange is positioned in the low-temperature liquefaction tank. When evaporated gas pressure in a storage tank reaches skipping pressure set by the safety valve, evaporated gas enters the low-temperature liquefaction tank through the gas flow-in pipeline; the cold head of the low-temperature refrigerator is connected with the low-temperature evaporated gas heat exchanger; the evaporated gas is condensed and reliquefied through coldness supplied by the cold head of the low-temperature refrigerator; and then the liquefied evaporated gas backflows to the liquefied natural gas storage tank through the liquid flow-out pipeline. The skid-mounted natural gas reliquefaction device with the structure is simple in structure and convenient to mount; and the liquefied evaporated gas can be recycled in time; unnecessary waste is avoided, and potential safety hazard is eliminated.
Description
Technical field
The utility model relates to the natural gas liquefaction device field, is specifically related to a kind of prying gas reliquefaction installation.
Background technology
In the storage and transport process of liquefied natural gas, because the temperature of liquefied natural gas is more much lower than extraneous, again can not be complete and extraneous adiabatic, thereby in the loading process of liquefied natural gas, can have certain gasification and produce boil-off gas.
It is the basic reason that causes the liquefied natural gas liquid evaporation that LNG tank leaks heat.Liquefied natural gas liquid has extraneous heat and constantly is delivered in the tank through thermal insulating warm-keeping layer in the process that stores, this part heat is absorbed by the liquefied natural gas liquid of low temperature, causes a part of liquefied natural gas liquid to flash to gas.The generation of boil-off gas not only can cause product loss also can become the potential safety hazard of storage tank.If the natural gas straight of evaporation is run in to be put in the atmosphere and not only can slattern a lot of fuel, also can to environment, increase the weight of greenhouse effects.
The tank of middle-size and small-size LNG tank holds less, from liquefaction system economic analysis again, if the liquefaction cycle system is set again, then can increase a lot of equipment, such as heat exchanger, compressor, decompressor etc., the corresponding increase of operation and maintenance cost.But from the security standpoint analysis, natural gas is flammable explosive gas, if all be discharged in the atmosphere owing to storage tank leaks the hot liquefied natural gas boiloff gas that causes, not only can cause environmental pollution, and can waste energy.If the position of storage tank or LNG Vaporizing Station far from the residential block very close to, directly discharging also can cause certain harm near resident healthy.
Most of LNG Vaporizing Station, all be provided with safety valve and boil-off gas surge tank, general gasification station all is provided with the boil-off gas heater, the outlet of boil-off gas heater is the boil-off gas surge tank, and the boil-off gas after the process heater directly enters pressure regulation, metering, device for adding odor directly sends into high pressure afterwards or sub-high pressure is failed pipe network outward.
But peak regulation type or standby type LNG Vaporizing Station liquid inlet and outlet are not frequent, and cold can not be replenished in the storage tank, and the amount of boil-off gas can not directly be discharged in the gas line network more again, thereby, liquefaction system can only be set again reclaim liquefied natural gas.
Therefore, selecting efficient and rational natural gas vaporization gas disposal mode, is that those skilled in the art are badly in need of the technical problem that solves at present.
The utility model content
The purpose of this utility model provides a kind of prying gas reliquefaction installation, and this prying gas reliquefaction installation is simple in structure, is convenient to install, and can in time reclaim the liquefaction boil-off gas, has avoided unnecessary waste and has eliminated potential safety hazard.
In order to realize above-mentioned technical purpose, the utility model provides a kind of prying gas reliquefaction installation, comprise low-temperature liquefaction groove, Cryo Refrigerator and low-temperature evaporation gas heat exchanger, described low-temperature liquefaction groove has the gas inflow line and liquid flows out pipeline, and described gas inflow line has safety valve; The cold head of described Cryo Refrigerator links to each other with described low-temperature evaporation gas heat exchanger, and described low-temperature evaporation gas heat exchanger is positioned at described low-temperature liquefaction groove.
Preferably, the bottom of described low-temperature liquefaction groove is gradient shape, and the connected entrance of described liquid outflow pipeline is positioned at the low side of described bottom.
Preferably, described Cryo Refrigerator is sterlin refrigerator, and its course of work is comprised of two constant temperature process and two constant volume process.
Preferably, low-temperature evaporation gas heat exchanger is rib-type.
Preferably, described prying gas reliquefaction installation is positioned on the sledge seat of LNG tank top, and described gas inflow line flows out pipeline with described liquid and all links to each other with described LNG storage tank.
The prying gas reliquefaction installation that the utility model provides comprises low-temperature liquefaction groove, Cryo Refrigerator and low-temperature evaporation gas heat exchanger, and the low-temperature liquefaction groove has the gas inflow line and liquid flows out pipeline, and the gas inflow line has safety valve; The cold head of Cryo Refrigerator links to each other with low-temperature evaporation gas heat exchanger, and low-temperature evaporation gas heat exchanger is positioned at the low-temperature liquefaction groove.
When boil-off gas pressure reaches the release pressure of safety valve setting in the LNG tank, safety valve is opened, boil-off gas in the liquefied gas storage enters into the low-temperature liquefaction groove by the gas inflow line, the cold head of Cryo Refrigerator and low-temperature evaporation gas heat exchanger link together, and place the low-temperature liquefaction groove, with the boil-off gas heat exchange from storage tank, the cold that cold head by Cryo Refrigerator provides, the boil-off gas condensation is liquefied again, relies on afterwards the self gravitation effect to flow out pipeline by liquid and is back in the LNG tank.The prying gas reliquefaction installation of this structure is simple in structure, be convenient to install, auxiliary device is few, operation and maintenance cost are low, can in time reclaim the liquefaction boil-off gas, avoided unnecessary waste and eliminated potential safety hazard.
Description of drawings
Fig. 1 is the structural representation of a kind of specific embodiment of prying gas reliquefaction installation provided by the utility model.
Wherein, the Reference numeral among Fig. 1 is as follows:
The specific embodiment
Core of the present utility model provides a kind of prying gas reliquefaction installation, and this prying gas reliquefaction installation is simple in structure, is convenient to install, and can in time reclaim the liquefaction boil-off gas, has avoided unnecessary waste and has eliminated potential safety hazard.
In order to make those skilled in the art better understand the technical solution of the utility model, the utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 1, Fig. 1 is the structural representation of a kind of specific embodiment of prying gas reliquefaction installation provided by the utility model.
In a kind of concrete embodiment, the utility model provides a kind of prying gas reliquefaction installation, comprise low-temperature liquefaction groove 5, Cryo Refrigerator 3 and low-temperature evaporation gas heat exchanger 4, described low-temperature liquefaction groove 5 has gas inflow line 2 and liquid flows out pipeline 6, and described gas inflow line 2 has safety valve 1; The cold head 7 of described Cryo Refrigerator 2 links to each other with described low-temperature evaporation gas heat exchanger 4, and described low-temperature evaporation gas heat exchanger 4 is positioned at described low-temperature liquefaction groove 5.
The boil-off gas of the middle-size and small-size LNG tank skid-mounted unit that liquefies again supports the top that is positioned at LNG tank by support frame 9 and sledge seat 8, is convenient to drawing and the liquid backflow after the liquefaction again of boil-off gas.
When boil-off gas pressure in the storage tank reaches the release pressure of safety valve 1 setting, safety valve 1 is opened, boil-off gas in the liquefied gas storage enters into low-temperature liquefaction groove 5 by gas inflow line 2, cold head 7 and the low-temperature evaporation gas heat exchanger 4 of Cryo Refrigerator 3 link together, and place low-temperature liquefaction groove 5, with the boil-off gas heat exchange from storage tank, the cold that cold head 7 by Cryo Refrigerator 3 provides, the boil-off gas condensation is liquefied again, relies on afterwards the self gravitation effect to flow out pipeline 6 by liquid and is back in the LNG tank.
The prying gas reliquefaction installation of this structure is simple in structure, be convenient to install, auxiliary device is few, operation and maintenance cost are low, can in time reclaim the liquefaction boil-off gas, avoided unnecessary waste and eliminated potential safety hazard.Can play the effect of auxiliary cooling in transportation and storage device, be that a kind of effective cold replenishes the means that reclaim boil-off gas.Handle boil-off gas well to the raising energy utilization rate, protection of the environment, energy savings realizes that sustainable development has great importance.
Concrete, the bottom of low-temperature liquefaction groove 5 is gradient shape, the connected entrance of liquid outflow pipeline 6 is positioned at the low side of described bottom, and low-temperature liquefaction groove 5 can be the low-temperature liquefaction groove 5 of austenitic stainless steel, and the liquid influent after being convenient to liquefy again in the slope of its bottom flows out pipeline 6.
More specifically, Cryo Refrigerator 3 can be sterlin refrigerator, and its course of work is comprised of two constant temperature process and two constant volume process, the sterlin refrigerator compact conformation, operating temperature range is wide, starting is fast, efficient is high, easy and simple to handle.
Further, low-temperature evaporation gas heat exchanger 4 can be rib-type, the cold face temperature etc. compact conformation, efficient, light and handy, heat transfer efficiency is high, the fin material can be selected the higher red copper of thermal conductivity.
In above-mentioned each specific embodiment, gas inflow line 2 is actually the boil-off gas of storage tank and draws pipeline, and liquid flows out the liquid backflow pipeline that pipeline 6 is actually storage tank.
The above only is the description of the preferred embodiment of utility model; should be understood that; because the finiteness of literal expression; and objectively have unlimited concrete structure; for those skilled in the art; under the prerequisite that does not break away from the utility model principle, can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (5)
1. prying gas reliquefaction installation, it is characterized in that, comprise low-temperature liquefaction groove (5), Cryo Refrigerator (3) and low-temperature evaporation gas heat exchanger (4), described low-temperature liquefaction groove (5) has gas inflow line (2) and liquid flows out pipeline (6), and described gas inflow line (2) has safety valve (1); The cold head (7) of described Cryo Refrigerator (2) links to each other with described low-temperature evaporation gas heat exchanger (4), and described low-temperature evaporation gas heat exchanger (4) is positioned at described low-temperature liquefaction groove (5).
2. prying gas reliquefaction installation as claimed in claim 1 is characterized in that, the bottom of described low-temperature liquefaction groove (5) is gradient shape, and the connected entrance of described liquid outflow pipeline (6) is positioned at the low side of described bottom.
3. prying gas reliquefaction installation as claimed in claim 2 is characterized in that, described Cryo Refrigerator (3) is sterlin refrigerator, and its course of work is comprised of two constant temperature process and two constant volume process.
4. prying gas reliquefaction installation as claimed in claim 3 is characterized in that, low-temperature evaporation gas heat exchanger (4) is rib-type.
5. such as each described prying gas reliquefaction installation of claim 1 to 4, it is characterized in that, described prying gas reliquefaction installation is positioned on the sledge seat (8) at LNG tank top, and described gas inflow line (2) flows out pipeline (6) with described liquid and all links to each other with described LNG tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220437793.XU CN202860164U (en) | 2012-08-30 | 2012-08-30 | Skid-mounted natural gas reliquefaction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220437793.XU CN202860164U (en) | 2012-08-30 | 2012-08-30 | Skid-mounted natural gas reliquefaction device |
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| Publication Number | Publication Date |
|---|---|
| CN202860164U true CN202860164U (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220437793.XU Expired - Lifetime CN202860164U (en) | 2012-08-30 | 2012-08-30 | Skid-mounted natural gas reliquefaction device |
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| CN (1) | CN202860164U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983125A (en) * | 2014-05-06 | 2014-08-13 | 昆山达功电子有限公司 | High vacuum multi-layer heat insulation Dewar type container |
| CN106764395A (en) * | 2015-11-19 | 2017-05-31 | 张家港中集圣达因低温装备有限公司 | LNG tank |
| CN107933328A (en) * | 2017-11-15 | 2018-04-20 | 瑞华特装(天津)低温设备有限公司 | A kind of electric automobile LNG distance increasing units |
| CN108224898A (en) * | 2018-01-16 | 2018-06-29 | 中科睿凌江苏低温设备有限公司 | A kind of prying gas reliquefaction installation |
| CN108799823A (en) * | 2017-05-02 | 2018-11-13 | 中国石油化工股份有限公司 | A kind of recycling of On Lng Leakage and boil-off gas retracting device |
-
2012
- 2012-08-30 CN CN201220437793.XU patent/CN202860164U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983125A (en) * | 2014-05-06 | 2014-08-13 | 昆山达功电子有限公司 | High vacuum multi-layer heat insulation Dewar type container |
| CN103983125B (en) * | 2014-05-06 | 2016-09-07 | 昆山一邦泰汽车零部件制造有限公司 | High vacuum multiple layer heat insulation Dewar type container |
| CN106764395A (en) * | 2015-11-19 | 2017-05-31 | 张家港中集圣达因低温装备有限公司 | LNG tank |
| CN108799823A (en) * | 2017-05-02 | 2018-11-13 | 中国石油化工股份有限公司 | A kind of recycling of On Lng Leakage and boil-off gas retracting device |
| CN107933328A (en) * | 2017-11-15 | 2018-04-20 | 瑞华特装(天津)低温设备有限公司 | A kind of electric automobile LNG distance increasing units |
| CN108224898A (en) * | 2018-01-16 | 2018-06-29 | 中科睿凌江苏低温设备有限公司 | A kind of prying gas reliquefaction installation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180606 Address after: 250101 H tower, golden age Plaza, No. 9999, ten road, Ji'nan, Shandong Patentee after: CNOOC PETROCHEMICAL ENGINEERING Co.,Ltd. Address before: 266000 Haikou Road, Laoshan District, Qingdao, Shandong Province, No. 277 Patentee before: COOEC-ENPAL ENGINEERING Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130410 |
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| CX01 | Expiry of patent term |